Spray metering device

Abstract

The utility model discloses a kind of spraying metering devices, including stop valve, flow guide pipe and metering assembly;Two stop valves are provided, each stop valve includes valve body and two air valve assemblies;Valve body is provided with sequentially communicating liquid inlet chamber, transition chamber and liquid outlet chamber;Each air valve assembly is respectively arranged in liquid inlet chamber and liquid outlet chamber;Flow guide pipe is provided with two, one end of one flow guide pipe is communicated with each liquid inlet chamber respectively, and the other end of another flow guide pipe is communicated with each liquid outlet chamber respectively;Metering assembly includes metering cylinder, push block and drive assembly;Two ends of metering cylinder are communicated with each transition chamber respectively;Push block is built into metering cylinder, and drive assembly is arranged in one of valve body and is drivenly connected with push block.The scheme can accurately control the flow of coating liquid, to ensure uniformity in the process of spraying.

Description

Technical Field

[0001] This utility model relates to the field of spraying technology, and in particular to a spraying metering device. Background Technology

[0002] A spray metering device can precisely control the amount of paint sprayed each time. For example, in the process of painting a car body, a metering device can ensure that the amount of paint sprayed on different parts such as the doors, roof, and sides of the car is consistent, so that the paint adheres evenly to the surface of the object being painted, thereby ensuring the uniformity of the coating.

[0003] In some related technologies, such as the patent with publication number CN214440149U, a hybrid metering integrated spraying device is disclosed, including a first raw material tank, a second raw material tank, a metering mechanism, and a spray gun. The first raw material tank and the second raw material tank enter the metering mechanism through a first feed pipe and a second feed pipe, respectively. A first feed pump and a second feed pump are installed on the first feed pipe and the second feed pipe, respectively. The metering mechanism includes a metering cylinder, a push rod, a push block, and a cylinder. The push block is set in the metering cylinder and is connected to the cylinder through the push rod. The metering cylinder has four ports, each equipped with a one-way valve. The four ports are a first feed port, a first discharge port, a second feed port, and a second discharge port. The first feed port is connected to the first raw material tank through the first feed pipe, the second feed port is connected to the second raw material tank through the second feed pipe, and the first discharge port and the second discharge port are connected to the spray gun through the first discharge pipe and the second discharge pipe, respectively.

[0004] The above solution has some problems. For example, it requires setting up a first raw material tank and a second raw material tank separately. Since the first raw material tank and the second raw material tank enter the metering mechanism through their respective feed pipes, and the four ports of the metering mechanism are equipped with one-way valves, this solution may lead to difficulty in accurately controlling the amount of the two raw materials entering the metering cylinder due to differences in factors such as the supply pressure and flow rate of the two raw material tanks during the process of the raw materials entering the metering cylinder, thus affecting the uniformity of the spraying. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides a spraying metering device.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A spraying metering device, the spraying metering device comprising:

[0008] The valve includes two shut-off valves, each comprising a valve body and two pneumatic valve assemblies. The valve body contains an inlet chamber, a transition chamber, and an outlet chamber that are connected in sequence. Each pneumatic valve assembly is respectively disposed in the inlet chamber and the outlet chamber.

[0009] The guide tube has two sections, one of which is connected to each of the liquid inlet chambers at both ends, and the other of which is connected to each of the liquid outlet chambers at both ends; each guide tube is provided with a liquid outlet.

[0010] A metering assembly includes a metering cylinder, a pusher block, and a drive assembly; the two ends of the metering cylinder are respectively connected to each of the transition chambers; the pusher block is built into the inner cavity of the metering cylinder, and the drive assembly is disposed in one of the valve bodies and drivenly connected to the pusher block, which can drive the pusher block to move along the axial direction of the metering cylinder.

[0011] In a preferred embodiment of this utility model, the liquid outlet is located in the middle of the side wall of the guide tube.

[0012] In a preferred embodiment of this utility model, one of the shut-off valves is located directly above the other shut-off valve; each of the transition chambers is coaxially arranged.

[0013] The spray metering device also includes two pressure sensors, each of which is located on the top of the upper valve body. The detection end of one pressure sensor extends to the inlet chamber, and the detection end of the other pressure sensor extends to the outlet chamber.

[0014] In a preferred embodiment of the present invention, the drive assembly includes a driver and a first connecting rod; the driver is disposed on one of the valve bodies, the power output shaft of the driver is connected to one end of the first connecting rod, and the push block is detachably sleeved on the first connecting rod.

[0015] In a preferred embodiment of this utility model, each valve body is provided with a guide member, and the guide member has a through guide hole; the first connecting rod movably passes through each of the guide holes.

[0016] As a preferred embodiment of the present utility model, the spray metering device further includes a leakage collection box, which is detachably disposed on the lower guide member, and the end of the first connecting rod away from the driver is movably inserted into the leakage collection box.

[0017] In a preferred embodiment of this utility model, a sealing ring is provided between the outer side of the push block and the inner wall of the metering cylinder, and the outer wall of the sealing ring is interference-fitted with the inner wall of the metering cylinder.

[0018] In a preferred embodiment of this utility model, both the inlet chamber and the outlet chamber include an upper cavity and a lower cavity that are interconnected, and the lower cavity is also connected to the transition cavity and the guide tube.

[0019] As a preferred embodiment of this utility model, the air valve assembly includes:

[0020] A pneumatic actuator includes a first vent pipe, a second vent pipe, a piston cylinder, and a piston. The piston cylinder is detachably housed within the upper cavity and has a movable chamber connected to the first vent pipe, the outlet of which extends to the top of the piston. The second vent pipe is located outside the valve body, with its outlet extending to the bottom of the piston. The piston is movably disposed within the movable chamber.

[0021] A valve core structure is located in the lower cavity and one end of it is connected to the piston. The piston can drive the valve core structure to move closer to or away from the communication port between the transition cavity and the lower cavity.

[0022] In a preferred embodiment of the present invention, the valve core structure includes a second connecting rod and a valve core; one end of the second connecting rod is connected to the piston, and the other end of the second connecting rod is detachably connected to the valve core.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This scheme involves the coating liquid flowing into the first guide pipe. The coating liquid flows along the first guide pipe and enters the inlet chambers of two shut-off valves. At this time, the first air valve assembly of the lower shut-off valve opens, allowing the coating liquid to flow from the inlet chamber into the transition chamber. When the drive assembly drives the push block upward, the pressure in the metering cylinder changes. Simultaneously, the inner cavity of the metering cylinder connects with the transition chamber of the lower shut-off valve. As the push block rises, the coating liquid in the transition chamber of the lower shut-off valve flows into the inner cavity of the metering cylinder. Meanwhile, the coating liquid above the push block is pushed into the transition chamber of the upper shut-off valve. At this time, the second air valve assembly of the upper shut-off valve opens, allowing the coating liquid to flow from the transition chamber into the outlet chamber, so that the coating liquid finally flows out through the liquid outlet of the second guide pipe. Conversely, when the drive assembly drives the push block downward, the pressure in the metering cylinder changes again. Because the first air valve assembly of the upper shut-off valve opens the connection between the inlet chamber and the transition chamber, connecting the metering cylinder with the transition chamber of the upper shut-off valve, the descent of the push block draws the coating liquid from the transition chamber of the upper shut-off valve into the metering cylinder. Simultaneously, the coating liquid below the push block flows into the transition chamber of the lower shut-off valve. At this point, the second air valve assembly of the lower shut-off valve opens, allowing the coating liquid to flow from the transition chamber into the outlet chamber, ultimately exiting through the outlet of the second guide pipe. This cycle repeats, with the push block repeatedly rising and falling, ensuring continuous flow and distribution of the coating liquid. This allows for precise control of the coating liquid outflow and guarantees uniformity during the spraying process. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an overall structural diagram of an embodiment of the present utility model.

[0027] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this utility model.

[0028] Figure 3 yes Figure 2 A magnified view of section A in the image.

[0029] Figure 4 This is a structural diagram of the guide hole in an embodiment of the present invention.

[0030] Figure 5 This is a structural cross-sectional view of the air valve assembly according to an embodiment of the present utility model.

[0031] Figure 6 This is an exploded view of the pneumatic actuator and valve core structure according to an embodiment of the present invention.

[0032] Figure 7 This is a structural cross-sectional view of the valve body according to an embodiment of the present utility model.

[0033] Figure 8 This is a cross-sectional view of the structure of each valve body, guide pipe and metering cylinder in an embodiment of this utility model.

[0034] Numbers in the diagram

[0035] 1. Shut-off valve; 11. Valve body; 111. Inlet chamber; 112. Transition chamber; 113. Outlet chamber; 114. Upper chamber; 115. Lower chamber; 12. Connecting port;

[0036] 2. Guide tube; 21. Inlet; 22. Outlet;

[0037] 3. Metering assembly; 31. Metering cylinder; 32. Push block; 33. Sealing ring; 34. Drive assembly; 341. Driver; 342. First connecting rod; 3421. First rod body; 3422. Second rod body;

[0038] 4. Pressure sensor;

[0039] 5. Guide component; 51. Guide hole;

[0040] 6. Leakage collection box;

[0041] 7. Valve assembly; 71. Pneumatic actuator; 711. First vent pipe; 712. Second vent pipe; 713. Piston cylinder; 7131. Moving chamber; 7132. Vent port; 72. Valve core structure; 721. Second connecting rod; 722. Valve core; 73. Piston. Detailed Implementation

[0042] To make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following describes this application in further detail with reference to the accompanying drawings and embodiments.

[0043] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0044] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0045] When a component is said to be "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0046] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0048] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0049] In order to solve the technical problems mentioned in the background art, this utility model provides a spraying metering device.

[0050] The following describes in detail the specific structure of a spray metering device provided by an embodiment of this utility model, according to the appendix. Figure 1-8 As shown, the specific structure of the spraying metering device includes a shut-off valve 1, a guide pipe 2, and a metering component 3.

[0051] There are two shut-off valves 1; each shut-off valve 1 includes a valve body 11 and two air valve assemblies 7; the valve body 11 is provided with an inlet chamber 111, a transition chamber 112 and an outlet chamber 113 connected in sequence; each air valve assembly 7 is respectively located in the inlet chamber 111 and the outlet chamber 113.

[0052] Specifically, the inlet chamber 111 receives the coating liquid, the transition chamber 112 serves as a transition area for the coating liquid, and the outlet chamber 113 outputs the coating liquid to the next stage. Each air valve assembly 7 is installed in the inlet chamber 111 and the outlet chamber 113 to control the inflow and outflow of the coating liquid. For example, the first air valve assembly 7 controls the connection port 12 between the inlet chamber 111 and the transition chamber 112. When the first air valve assembly 7 is open, the coating liquid can flow from the inlet chamber 111 into the transition chamber 112; when closed, it prevents the coating liquid from flowing back from the transition chamber 112 to the inlet chamber 111. The second air valve assembly 7 controls the connection port 12 between the transition chamber 112 and the outlet chamber 113. When the second air valve assembly 7 is open, the coating liquid can flow from the transition chamber 112 into the outlet chamber 113; when closed, it prevents the coating liquid from flowing back from the outlet chamber 113 to the transition chamber 112.

[0053] In this embodiment of the invention, there are two shut-off valves 1, one of which is located directly above the other. This upper and lower layer layout allows the coating liquid to be evenly distributed between the two components.

[0054] Two guide pipes 2 are provided. One guide pipe 2 is connected to each liquid inlet chamber 111 at both ends, and the other guide pipe 2 is connected to each liquid outlet chamber 113 at both ends.

[0055] The metering component 3 includes a metering cylinder 31, a pusher block 32, and a drive component 34. The two ends of the metering cylinder 31 are connected to each other via transition chambers 112. The pusher block 32 is built into the metering cylinder 31. The drive component 34 is located in one of the valve bodies 11 and is driven to drive the pusher block 32, which can drive the pusher block 32 to move along the axial direction of the metering cylinder 31.

[0056] Specifically, the two ends of the first guide pipe 2 are connected to the inlet chambers 111 of the two shut-off valves 1, respectively, for introducing the coating liquid into the inlet chambers 111 of each shut-off valve 1. The two ends of the second guide pipe 2 are connected to the outlet chambers 113 of the two shut-off valves 1, respectively, for outputting the metered coating liquid to the spray gun.

[0057] For example, the coating liquid enters through the inlet 21 of the first guide pipe 2 and flows along the first guide pipe 2, entering the inlet chambers 111 of the two shut-off valves 1 respectively. At this time, the first air valve assembly 7 of the shut-off valve 1 opens, allowing the coating liquid to flow from the inlet chamber 111 into the transition chamber 112. When the drive assembly 34 drives the push block 32 to move upward, the pressure in the metering cylinder 31 changes, so the lower end of the metering cylinder 31 is connected to the transition chamber 112 of the lower shut-off valve 1. When the push block 32 rises, the coating liquid in the transition chamber 112 of the lower shut-off valve 1 rises, and at the same time, the coating liquid above the push block 32 is pushed into the transition chamber 112 of the upper shut-off valve 1 by the push block 32. At this time, the second air valve assembly 7 of the upper shut-off valve 1 opens, allowing the coating liquid to flow from the transition chamber 112 into the outlet chamber 113, so that the coating liquid finally flows out through the outlet 22 of the second guide pipe 2.

[0058] Conversely, when the drive assembly 34 drives the pusher block 32 to move downwards, the pressure in the metering cylinder 31 changes again. Since the first air valve assembly 7 opens the connection port 12 between the inlet chamber 111 and the transition chamber 112, the upper end of the metering cylinder 31 connects to the transition chamber 112 of the upper shut-off valve 1. The descent of the pusher block 32 draws the coating liquid from the transition chamber 112 of the upper shut-off valve 1 into the metering cylinder 31, pushing the coating liquid into the transition chamber 112 of the lower shut-off valve 1. At this time, the second air valve assembly 7 of the lower shut-off valve 1 opens, allowing the coating liquid to flow from the transition chamber 112 into the outlet chamber 113, ultimately flowing out through the outlet port 22 of the second guide pipe 2. Thus, through the repeated upward and downward movement of the pusher block 32, the coating liquid can be continuously pushed and distributed, enabling continuous spraying by the spray gun.

[0059] In some specific embodiments, the liquid outlet (including the liquid inlet 21 and the liquid outlet 22) is located in the middle of the side of the guide tube 2.

[0060] For example, when the coating liquid enters the guide tube 2, the velocity distribution at the inlet is usually uneven. If the inlet 21 is close to the end of the guide tube 2, the coating liquid is prone to significant turbulence and eddies upon entering the guide tube 2, resulting in pressure fluctuations and pulsation. Therefore, placing the inlet 21 in the middle of the side wall of the guide tube 2 allows the coating liquid to enter the guide tube 2 more uniformly. For instance, after the coating liquid enters the guide tube 2, its pressure distribution gradually stabilizes with the flow distance. If the inlet 21 is located in the middle of the side wall of the guide tube 2, the coating liquid will quickly diffuse outwards after entering the guide tube 2, forming a more uniform pressure distribution. This uniform pressure distribution helps reduce local high-pressure or low-pressure areas, thereby reducing pulsation.

[0061] In some specific embodiments, one shut-off valve 1 is located directly above the other shut-off valve 1; each transition chamber 112 is coaxially arranged; the spray metering device also includes two pressure sensors 4, each pressure sensor 4 is located on the top of the upper valve body 11, the detection end of one pressure sensor 4 extends to the inlet chamber 111, and the detection end of the other pressure sensor 4 extends to the outlet chamber 113.

[0062] Specifically, each pressure sensor 4 is positioned on the valve body 11 of the uppermost shut-off valve 1, placing its detection end at a high position. Due to gravity, some residual coating liquid will naturally flow to a lower position instead of remaining at the highest position for an extended period. Therefore, the residence time of some residual coating liquid at the detection end of the pressure sensor 4 can be reduced, thereby decreasing the amount of residual coating liquid at the detection end and extending the service life of each pressure sensor 4.

[0063] It should be noted that the detection end of the first pressure sensor 4 extends into the inlet chamber 111 of the upper shut-off valve 1 to measure the pressure of the coating liquid entering the inlet chamber 111. The detection end of the second pressure sensor 4 extends into the outlet chamber 113 of the upper shut-off valve 1 to measure the pressure of the coating liquid flowing out of the outlet chamber 113. For example, the pressure in the inlet chamber 111 directly affects the speed and flow rate of the coating liquid entering the transition chamber 112. The first pressure sensor 4 can monitor the stability of the inlet pressure in real time. If the inlet pressure is too high, the coating liquid may enter the transition chamber 112 too quickly, thus affecting the metering accuracy. If the inlet pressure is too low, the coating liquid supply may be insufficient, affecting the spraying effect. Therefore, by monitoring the inlet pressure, it is convenient for the staff to adjust the pressure of the inlet system in a timely manner to ensure a stable supply of coating liquid.

[0064] In some specific embodiments, the drive assembly 34 includes a driver 341 and a first connecting rod 342; the driver 341 is disposed on the upper valve body 11, the power output shaft of the driver 341 is connected to one end of the first connecting rod 342, and the push block 32 is detachably sleeved on the outside of the first connecting rod 342 or the bottom end of the first connecting rod 342.

[0065] Specifically, the power output shaft of the driver 341 is connected to one end of the first connecting rod 342. Power is transmitted to the first connecting rod 342 through rotation or linear motion of the power output shaft. Since one end of the first connecting rod 342 is connected to the power output shaft of the driver 341, and the other end is connected to the push block 32, the power of the driver 341 can be transmitted to the push block 32 through the first connecting rod 342, allowing the push block 32 to move axially within the metering cylinder 31. The push block 32 is detachably fitted onto the outside of the first connecting rod 342. This arrangement facilitates the installation and replacement of the push block 32. Thus, when the push block 32 becomes worn or damaged, it can be quickly replaced without replacing the entire drive assembly 34.

[0066] In a further embodiment, the first connecting rod 342 includes a first rod body 3421 and a second rod body 3422; one end of the first rod body 3421 is detachably connected to the power output shaft of the driver 341, the other end of the first rod body 3421 is detachably inserted into the top of the push block 32, and the end of the second rod body 3422 opposite to the first rod body 3421 is detachably inserted into the bottom of the push block 32.

[0067] Specifically, this type of first connecting rod 342 is more convenient to disassemble; for example, one end of the first rod 3421 is first installed on the power output shaft of the driver 341, and then the other end of the first rod 3421 is inserted into the inside of the metering cylinder 31 and detachably connected to the top of the push block 32; one end of the second rod 3422 is inserted into the inside of the metering cylinder 31 and detachably connected to the bottom of the push block 32, making the installation and replacement of each component more convenient and quick, reducing the time and cost required during disassembly and assembly.

[0068] In addition, the first rod 3421 and the second rod 3422 are respectively connected to the top and bottom of the push block 32. This connection method significantly enhances the stability of the connection between the push block 32 and each rod. Moreover, during the up-and-down movement of the push block 32, it can effectively reduce the loosening of the connection caused by vibration or impact, ensuring the smoothness and reliability of the push block 32 in movement.

[0069] It is understandable that the push block 32 has a through threaded hole, and one end of the first rod 3421 and one end of the second rod 3422 are provided with external threads for engaging with the threaded hole; the connection method between the first rod 3421 and the power output shaft of the driver 341 is the same as the connection method between the first rod 3421 and the push block 32, which will not be elaborated here.

[0070] In a further embodiment, each valve body 11 is provided with a guide member 5, and the guide member 5 has a guide hole 51 passing through it; the first rod 3421 and the second rod 3422 are movably inserted through the corresponding guide hole 51.

[0071] Specifically, by providing the guide member 5 in each valve body 11, and each guide member 5 having a through guide hole 51, the inner diameter of the guide hole 51 matches the outer diameter of the first rod 3421 and the second rod 3422, thus providing a precise guide path for the first rod 3421 and the second rod 3422, ensuring that the first rod 3421 and the second rod 3422 always maintain a straight line during movement. This structure can prevent the first rod 3421 and the second rod 3422 from deviating or swaying during movement.

[0072] Understandably, a sealing ring is fitted between the first rod 3421 or the second rod 3422 and the inner wall of the guide 5 to prevent the coating liquid from leaking from the gap between them.

[0073] In a further embodiment, the lower guide 5 is provided with a detachable leakage collection box 6, and the end of the second rod away from the push block moves through the leakage collection box 6.

[0074] Specifically, the second rod 3422 is movably inserted into the leakage collection box 6, preventing the entire second rod 3422 from being directly exposed to the outside. Moreover, when the bottom end of the second rod 3422 moves into the leakage collection box 6, in order to prevent the coating liquid adhering to the outside of the second rod 3422 from falling directly onto the ground and causing pollution, the leakage collection box 6 is used to collect the residual coating liquid that falls from the second rod 3422. That is, the leaked coating liquid will flow directly into the leakage collection box 6, ensuring that the coating liquid can flow in smoothly and be stored, and preventing the coating liquid adhering to the second rod 3422 from leaking to the outside of the device.

[0075] It is understood that the bottom of the lower valve body 11 in this embodiment of the present invention is provided with a threaded hole, and the top of the leakage collection box 6 is provided with a thread for engaging with the threaded hole.

[0076] In some specific embodiments, a sealing ring 33 is fitted between the outer side of the push block 32 and the inner wall of the metering cylinder 31, and the outer wall of the sealing ring 33 is interference-fitted with the inner wall of the metering cylinder 31.

[0077] Specifically, by fitting the first sealing ring 33 around the outside of the pusher block 32, the tiny gap between the pusher block 32 and the inner cavity of the metering cylinder 31 is filled, preventing some of the coating liquid from leaking out of the gap. For example, it prevents the coating liquid located above the pusher block 32 from leaking below the pusher block 32, avoiding flow loss and uneven coating caused by leakage, as well as the problem of the actual amount of coating liquid sprayed not matching the design value.

[0078] It is understood that the first sealing ring 33 in this embodiment of the present invention is made of nitrile rubber, fluororubber, silicone rubber, etc., and the specific type is not limited here.

[0079] In some specific embodiments, the inlet chamber 111 and the outlet chamber 113 each include an upper cavity 114 and a lower cavity 115 that are interconnected. The lower cavity 115 is also connected to the transition chamber 112 and the guide pipe 2. The valve assembly 7 includes a pneumatic actuator 71 and a valve core structure 72.

[0080] Specifically, the pneumatic actuator 71 includes a first vent pipe 711, a second vent pipe 712, a piston cylinder 713, and a piston 73. The piston cylinder 713 is detachably built into the upper cavity 114, and a movable cavity 7131 is provided inside the piston cylinder 713. The top surface of the movable cavity 7131 is connected to the first vent pipe 711, and the air outlet end of the first vent pipe 711 extends to the top of the piston 73. The second vent pipe 712 is located outside the valve body 11, and its air outlet end extends to the bottom of the piston. The piston 73 is movably disposed in the movable cavity 7131.

[0081] It should be noted that the cavity wall of the movable cavity 7131 has a vent 7132 for communicating with the second vent pipe 712, and the piston 73 is located between the first vent pipe 711 and the vent 7132. A venting chamber for communicating with the vent 7132 and the second vent pipe 712 is provided between the outer side of the piston cylinder 713 and the cavity wall of the upper cavity 114.

[0082] Specifically, the piston cylinder 713 has a movable chamber 7131 inside, which is used to accommodate the piston 73 to move up and down. That is, the movable chamber 7131 serves as the movement space for the piston 73. The movable chamber 7131 is connected to the first vent pipe 711, which is connected to an external air source. The cavity wall of the movable chamber 7131 has a vent 7132 through it. The second vent pipe 712 is also connected to an external air source. Since a vent is provided between the piston cylinder 713 and the cavity wall of the upper cavity 114, compressed gas is blown into the movable chamber 7131 after passing through the vent. The piston 73 is movably disposed in the movable chamber 7131, and its movement direction is consistent with the axial direction of the piston 73. Therefore, the piston 73 can be driven to move up and down by generating a pressure difference. Since one end of the valve core structure 72 is connected to the piston 73, the movement of the piston 73 can drive the valve core structure 72 to move closer to or away from the communication port 12 between the transition chamber 112 and the lower chamber 115, thereby controlling the flow of liquid.

[0083] For example, in the initial state, piston 73 is located at the lower end of movable chamber 7131. At this time, valve core structure 72 is close to the communication port 12 between transition chamber 112 and lower chamber 115, completely blocking the passage and preventing liquid from passing through. When compressed air is introduced into the second vent pipe 712, the compressed air enters movable chamber 7131 through the second vent pipe 712, vent chamber, and vent port 7132, pushing piston 73 upward. When piston 73 moves upward, it can synchronously drive valve core structure 72 to move upward as well, thus gradually moving away from the communication port 12 between transition chamber 112 and lower chamber 115, at which point liquid can flow out. At the same time, since the intake pressure output by the second vent pipe 712 is greater than the exhaust pressure of the first vent pipe 711, piston 73 continues to rise under the action of pressure difference. Conversely, when compressed air is stopped from entering the second vent pipe 712 and compressed air is output from the first vent pipe 711, the compressed air enters the upper part of the movable chamber 7131 through the first vent pipe 711, thereby rapidly pushing the piston 73 downward and causing the valve core structure 72 to move downward until it blocks the communication port 12 between the transition chamber 112 and the lower chamber 115, preventing liquid from passing through. At this time, the intake pressure output from the first vent pipe 711 is greater than the exhaust pressure from the second vent pipe 712, and the piston 73 remains in a downward state under the action of this pressure difference. This configuration allows compressed air to be introduced or discharged instantaneously, causing the piston 73 to rise or fall rapidly.

[0084] The valve core structure 72 is located within the lower cavity 115, and one end of it is connected to the piston 73. The piston 73 can drive the valve core structure 72 to move closer to or further away from the communication port 12 between the transition cavity 112 and the lower cavity 115. More specifically, the valve core structure includes a second connecting rod and a valve core 722; one end of the second connecting rod is connected to the piston, and the other end of the second connecting rod is detachably connected to the valve core.

[0085] Specifically, one end of the second connecting rod 721 is connected to the piston 73, enabling the power of the piston 73 to be transmitted to the valve core 722. Therefore, when the piston 73 moves up and down under the action of the pneumatic actuator 71, the power is transmitted to the valve core 722 through the second connecting rod 721, allowing the valve core 722 to move closer to or further away from the communication port 12 between the transition chamber 112 and the lower chamber 115. The second connecting rod 721 ensures that the movement and direction of the piston 73 and the valve core 722 are synchronized.

[0086] Furthermore, the detachable connection between the valve core 722 and the second connecting rod 721 facilitates the maintenance and replacement of the valve core 722. Since the valve core 722 is prone to wear after prolonged operation, this solution only requires replacing the valve core 722 individually, without replacing the entire second connecting rod 721 or piston 73. For example, when the valve core 722 is worn or damaged, it can be easily removed from one end of the second connecting rod 721 and replaced with a new valve core 722, thus eliminating the need to replace the entire valve core structure 72 and reducing maintenance costs.

[0087] It is understood that the outer side wall of the second connecting rod 721 in this embodiment of the present invention is provided with external threads, the valve core 722 is provided with threaded holes, one end of the second connecting rod 721 is inserted into the threaded hole and its external threads engage with the internal threads of the threaded hole to fix the valve core 722. This connection method facilitates quick disassembly and installation and is particularly suitable for use environments that require frequent replacement of the valve core 722.

[0088] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A spray metering device, characterized in that, The spray metering device includes: The valve includes two shut-off valves, each comprising a valve body and two pneumatic valve assemblies. The valve body contains an inlet chamber, a transition chamber, and an outlet chamber that are connected in sequence. Each pneumatic valve assembly is respectively disposed in the inlet chamber and the outlet chamber. The guide tube has two sections, one of which is connected to each of the liquid inlet chambers at both ends, and the other of which is connected to each of the liquid outlet chambers at both ends; each guide tube is provided with a liquid outlet. A metering assembly includes a metering cylinder, a pusher block, and a drive assembly; the two ends of the metering cylinder are respectively connected to each of the transition chambers; the pusher block is built into the inner cavity of the metering cylinder, and the drive assembly is disposed in one of the valve bodies and drivenly connected to the pusher block, which can drive the pusher block to move along the axial direction of the metering cylinder.

2. The spray metering device of claim 1, wherein, The liquid outlet is located in the middle of the side wall of the guide tube.

3. The spray metering device of claim 1, wherein, One of the shut-off valves is located directly above the other shut-off valve; each of the transition chambers is coaxially arranged; The spray metering device also includes two pressure sensors, each of which is located on the top of the upper valve body. The detection end of one pressure sensor extends to the inlet chamber, and the detection end of the other pressure sensor extends to the outlet chamber.

4. The spraying metering device according to claim 3, characterized in that, The drive assembly includes a driver and a first connecting rod; the driver is disposed on one of the valve bodies, the power output shaft of the driver is connected to one end of the first connecting rod, and the push block is detachably sleeved on the first connecting rod.

5. The spraying metering device according to claim 4, characterized in that, Each valve body is provided with a guide member, and the guide member has a guide hole; the first connecting rod movably passes through each of the guide holes.

6. The spraying metering device according to claim 5, characterized in that, The spray metering device also includes a leakage collection box, which is detachably mounted on the lower guide member, and the end of the first connecting rod away from the driver is movably inserted into the leakage collection box.

7. The spraying metering device according to claim 1, characterized in that, A sealing ring is fitted between the outer side of the push block and the inner wall of the metering cylinder, and the outer wall of the sealing ring is interference-fitted with the inner wall of the metering cylinder.

8. The spraying metering device according to claim 1, characterized in that, Both the inlet chamber and the outlet chamber include an upper cavity and a lower cavity that are interconnected. The lower cavity is also connected to the transition cavity and the guide tube.

9. The spraying metering device according to claim 8, characterized in that, The valve assembly includes: A pneumatic actuator includes a first vent pipe, a second vent pipe, a piston cylinder, and a piston. The piston cylinder is detachably housed within the upper cavity and has a movable chamber connected to the first vent pipe, the outlet of which extends to the top of the piston. The second vent pipe is located outside the valve body, with its outlet extending to the bottom of the piston. The piston is movably disposed within the movable chamber. A valve core structure is located in the lower cavity and one end of it is connected to the piston. The piston can drive the valve core structure to move closer to or away from the communication port between the transition cavity and the lower cavity.

10. The spraying metering device according to claim 9, characterized in that, The valve core structure includes a second connecting rod and a valve core; one end of the second connecting rod is connected to the piston, and the other end of the second connecting rod is detachably connected to the valve core.

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