Extraction gun and extraction system comprising same

Abstract

The present application relates to an extraction gun and an extraction system comprising the same. The extraction gun comprises a gun barrel assembly (1), a valve seat (21) arranged at the lower end of the gun barrel assembly (1), a bottom valve (22) cooperating with the valve seat, and a valve stem (23) connected to the bottom valve (22), and a driver (3) arranged on the gun barrel assembly, wherein the upper end of the valve stem is coupled to the driver (3), and the driver (3) drives the bottom valve via the valve stem to switch between the following three positions relative to the valve seat: a sealing position; an extraction position, wherein the bottom valve (22) is located above and spaced apart from the valve seat (21); and a spraying position, wherein the bottom valve is located below and spaced apart from the valve seat (21). The present application greatly improves the integration, extraction accuracy, extraction efficiency and cleaning effect of the extraction system by integrating the sealing, extraction and spraying functions in a single-layer gun barrel assembly.

Description

Technical Field

[0001] This invention relates to an extraction system for pumping fluid materials in the production of fluid materials in industries such as chemical and food processing, and more specifically to an extraction gun used in the extraction system. Background Technology

[0002] Extraction systems for pumping fluid materials are commonly used in the production of fluid materials in industries such as chemicals and food. For example, in the blending and production of lubricating oils in the petrochemical field, large quantities of bulk additives need to be added to formulate lubricating oils suitable for the lubrication needs of different equipment or vehicles. Therefore, existing technologies include additive extraction systems. These fluid material extraction systems often use extraction guns connected to extraction pumps to draw fluid materials from containers under the drive of the pump. The fluid materials are then transported, for example, via pipelines to a blending vessel.

[0003] Existing extraction guns typically lack a bottom valve, thus lacking a sealing function at the bottom. This prevents timely shut-off and sealing when extraction reaches a certain volume, resulting in poor extraction accuracy. Furthermore, they cannot effectively clean containers such as barrels holding fluid materials.

[0004] In existing technologies, although some DDU extraction systems can achieve sealing and cleaning spray functions, the extraction gun needs to be made into a sandwich structure. That is, the extraction gun wall includes an inner wall and an outer wall, with a spray channel defined between the inner and outer walls and spray holes formed on the outer wall. The inner wall defines the internal material channel for extracting fluid materials. The cleaning solution is transported through the spray channel and sprayed onto the wall of the tank being cleaned through the spray holes. Because the outer diameter of the extraction gun is limited by the size of the tank opening, and the sandwich extraction gun significantly reduces the inner diameter of the internal material channel, the material extraction efficiency is low and the extraction effect is poor. It is impossible to extract high-viscosity materials from the tank in a short time. This is the biggest pain point and insurmountable technical problem of additive extraction systems. Summary of the Invention

[0005] The purpose of this invention is to solve at least one of the above-mentioned problems and / or other defects in the prior art.

[0006] To this end, the present invention provides an exemplary extraction gun, which includes a gun barrel assembly, a valve seat disposed at the lower end of the gun barrel assembly, a bottom valve cooperating with the valve seat, a valve stem connected to the bottom valve, and a driver disposed on the gun barrel assembly; wherein an internal channel is defined within the gun barrel assembly, the upper end of the valve stem is connected to the driver and moves within the internal channel under the drive of the driver, wherein the driver drives the bottom valve via the valve stem to switch it between three positions relative to the valve seat: a sealing position, wherein the bottom valve is in contact with and seals the valve seat; an extraction position, wherein the bottom valve is located above and spaced apart from the valve seat; and a spraying position, wherein the bottom valve is located below and spaced apart from the valve seat.

[0007] In this example, an internal channel is provided in the gun barrel assembly to allow the valve stem to move within it, and an actuator is provided to drive the valve stem to switch the bottom valve relative to the valve seat between three positions, enabling the extraction gun to achieve sealing, extraction, and spraying in three states. Since the gun barrel assembly can achieve spraying without an interlayer, the inner diameter of the internal channel of the gun barrel is maximized, greatly improving the extraction efficiency of the extraction system, shortening production time, and the maximized internal channel can meet the extraction needs of high-viscosity materials, making it applicable to a wider range of materials and improving the overall extraction efficiency of high-viscosity materials. Furthermore, the spraying function of the extraction gun cleans the viscous liquid adhering to the walls of containers such as barrels, minimizing material residue waste in the barrel, controlling the residue level to a minimum, reducing waste of expensive materials and environmental pollution, and reducing the user's barrel washing costs and the risk of cross-contamination between materials, while also reducing the waste of cleaning processes and cleaning solutions. The sealing function allows the bottom valve to close promptly, meeting the requirements for extraction accuracy. Furthermore, by integrating sealing, extraction, and spraying functions into a single-layer gun assembly, the integration, automation, extraction accuracy, extraction efficiency, and cleaning effect of the extraction system are greatly improved.

[0008] According to one embodiment of the invention, the actuator includes a first piston disposed within a housing of the actuator and a first piston rod connected to the first piston, wherein the first piston rod is coupled to a valve rod, the first piston being actuated downward to drive the bottom valve to a spray position and being actuated upward to drive the bottom valve to a extraction position.

[0009] In this example, the valve stem is connected to the piston rod to drive the bottom valve to the bottom of the valve seat, thereby achieving spraying. The spraying and extraction functions are realized with a simple structure.

[0010] According to one embodiment of the invention, the actuator further includes a second piston disposed within the housing above the first piston and a second piston rod connected to the second piston, wherein the upper end of the first piston rod and the lower end of the second piston rod are capable of abutting and separating, wherein the second piston can be actuated downward to drive the bottom valve to a sealing position by abutting the first piston rod via the second piston rod.

[0011] In this example, by further setting a second piston and driving the bottom valve through the cooperation of the second piston rod and the first piston rod to achieve sealing, the spraying function, extraction function and sealing function are integrated in a simple structure.

[0012] According to one embodiment of the invention, the actuator further includes a first block fixed in the actuator housing between the first piston and the second piston and limiting the first piston and the second piston, wherein a first central hole is formed in the first block for the second piston rod to slide in a sealing manner therein; the actuator further includes a second block fixed in the actuator housing below the first piston, wherein a second central hole is formed in the second block for the first piston rod to slide in a sealing manner therein.

[0013] In this example structure, the positions of the first piston and the second piston are limited by setting a first block and a second block, thus realizing the piston function with a simple structure.

[0014] According to one embodiment of the invention, a first port, a second port and a third port are formed on the housing. The first port is in fluid communication with a first piston cavity located between a first piston and a first block. The second port is in fluid communication with a second piston cavity located between a first piston and a second block. The third port is in fluid communication with a third piston cavity located above the second piston.

[0015] According to one embodiment of the invention, the extraction gun further includes a solenoid valve for controlling the flow of fluid into and out of the first port, the second port, and the third port.

[0016] According to one embodiment of the present invention, the solenoid valve includes a two-position five-way dual-electric solenoid valve, wherein when the two-position five-way dual-electric solenoid valve is in position A, which is connected to the third port, the second piston is driven downward until it abuts against the first block, and the second piston rod abuts against the first piston rod, thereby driving the bottom valve to the sealing position; and when the two-position five-way dual-electric solenoid valve is in position B, which is connected to the first port, the first piston is driven downward until it abuts against the second block, the first piston rod separates from the second piston rod, and drives the bottom valve to the spray position.

[0017] According to one embodiment of the present invention, the solenoid valve further includes a two-position three-way single-electro-controlled solenoid valve. When the two-position three-way single-electro-controlled solenoid valve is in the position connected to the second port, the first piston is driven upward until it abuts against the first block. At this time, the first piston rod drives the bottom valve to the extraction position.

[0018] According to one example of the invention, the actuator further includes a first return spring disposed between the first piston and the second block.

[0019] According to one embodiment of the invention, the actuator further includes a third block fixed above the second piston in the housing of the actuator, and a second return spring disposed between the third block and the second piston.

[0020] According to one embodiment of the invention, the actuator further includes an adjusting nut assembly disposed at the upper end of the actuator housing, wherein the adjusting nut assembly is coupled to a second piston rod for adjusting the position of the foot valve. This allows the foot valve to be adjusted to the appropriate position relative to the valve seat even in the presence of manufacturing or assembly errors.

[0021] According to another aspect of the present invention, an extraction system is provided, which includes the extraction guns described in the above examples.

[0022] The extraction gun and extraction system according to various embodiments of the present invention have at least one of the following beneficial effects: They integrate sealing, extraction, and spraying functions into a single-layer gun assembly, greatly improving the integration, accuracy, and efficiency of the extraction gun; the internal channel size of the gun assembly is maximized, significantly improving extraction speed and efficiency, and shortening extraction time; they meet the extraction needs of high-viscosity materials, making them applicable to a wider range of materials; they can clean residual viscous liquid adhering to the walls of the container, minimizing material waste and controlling residue levels to a minimum, reducing waste of expensive materials and environmental pollution, and reducing user costs for container cleaning and the risk of cross-contamination between materials, while also reducing cleaning processes and waste of cleaning fluid; the entire extraction system is simple to operate, highly automated, and improves work efficiency and productivity; there is no cross-contamination, ensuring product quality reliability; there is no leakage, reducing material loss, and the site is clean and free of safety hazards. Attached Figure Description

[0023] The above and other features and advantages of the present invention will become apparent from the following detailed description provided with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and therefore should not be considered as limiting the scope of this application, wherein:

[0024] Figure 1a , 1b Figures 1 and 1c respectively show cross-sectional schematic diagrams of an extraction gun according to an exemplary embodiment of the present invention in a sealed position, an extraction position, and a spraying position; and

[0025] Figure 2a , 2b Figures 2c and 2c schematically show the valve seat and foot valve in the sealed, extraction, and spray positions, respectively. Detailed Implementation

[0026] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the invention. However, it will be apparent to those skilled in the art that implementations of the invention may not include some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, the invention can be conceived to be practiced with any combination of the features and elements described below, regardless of whether they relate to different exemplary embodiments. Therefore, the aspects, features, embodiments, and advantages described below are illustrative only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0027] It should be noted that the directional terms such as "up" and "down" mentioned in this invention refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing embodiments of the invention and for 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 the embodiments of the invention. Furthermore, these orientations or positional relationships are merely relative concepts in three-dimensional space and can change depending on the different positions of the extraction gun and different usage states. Therefore, these or other directional terms should not be construed as restrictive terms.

[0028] It should be noted that, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to fixed connections, such as welding, or detachable connections, such as screw connections or snap-fit ​​connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances. It should also be pointed out that, in this document, "linkage" refers to various ways of connecting different components into a whole to enable them to move together, including ways in which two components are indirectly connected together through other intermediate components, and also ways in which two components are directly connected together.

[0029] Furthermore, terms such as “first” and “second” are used herein to describe the elements of this application. These terms are used only to distinguish the individual elements and are not intended to limit the nature, sequence, order, or number of these elements.

[0030] See Figure 1a , 1b 1c illustrates an extraction gun according to an exemplary embodiment of the present invention. The extraction gun includes... Figure 1a , 1b The lower part of the gun barrel assembly 1 in 1c is hollow, defining an internal channel 11. The gun barrel assembly 1 is as follows... Figure 1a , 1b As shown in Figure 1c, the extraction gun includes a connection 12 connected to an extraction pump (not shown) to draw fluid materials (e.g., additives) from a container (e.g., a barrel) through an internal channel 11, or to draw fluid (e.g., cleaning agent) into a container through the internal channel 11. The extraction gun also includes a valve seat 21 located at the lower end of the gun barrel assembly 1, a bottom valve 22 cooperating with the valve seat, and a valve stem 23 connected to the bottom valve 22. The extraction gun also includes a driver 3 located at the upper end of the gun barrel assembly 1, wherein the upper end of the valve stem 23 is connected to the driver 3 and can reciprocate up and down in the internal channel 11 under the drive of the driver 3. The driver 3 drives the bottom valve 22 via the valve stem 23 so that it reciprocates relative to the valve seat 21. Figure 2a , 2b Switching between the sealing position, extraction position, and spray position shown in 2c. (As shown in...) Figure 1a , 2a In the sealed position shown, the bottom valve 22 abuts against and seals the valve seat 21, thus preventing fluid material from returning from the extraction gun to the container, or from entering the extraction gun from the container. In such a position... Figure 1b , 2b In the extraction position shown, the bottom valve 22 is located above and spaced apart from the valve seat 21. The fluid material, under the action of the extraction pump connected to the extraction gun, enters the extraction gun from the container through the gap between the bottom valve 22 and the valve seat 21, and is then drawn out. Figure 1c , 2c In the spray position shown, the bottom valve 22 is located below and spaced apart from the valve seat 21. Fluid, such as a cleaning agent, is sprayed from the internal channel 11 of the extraction gun into the container through the gap between the bottom valve 22 and the valve seat 21 to achieve spray cleaning of the inner wall of the container.

[0031] like Figure 1a , 1bAs shown in 1c, the actuator 3 includes a first piston 31 disposed within the housing 30 of the actuator 3 and a first piston rod 39 connected to the first piston 31, wherein the first piston rod 39 is connected to the valve stem 23, for example, via a coupling. The actuator 3 also includes a second piston 32 disposed above the first piston 31 within the housing 30 and a second piston rod 321 connected to the second piston 32, wherein the lower end of the second piston rod 321 can abut against and separate from the upper end of the first piston rod 39. The actuator also includes a first block 34, a second block 35, and a third block 33 fixed to the housing 30 of the actuator. The first block 34 is located between the first piston 31 and the second piston 32 and can limit the movement of the first piston 31 and the second piston 32, wherein a first central hole is formed in the first block 34 for the second piston rod 321 to slide in a sealing manner therein. The second block 35 is fixed to the housing 30 of the actuator below the first piston 31, and the second block 35 has a second central hole formed therein for the first piston rod 39 to slide in a sealing manner therein. The third block 33 is fixed to the housing 30 of the actuator above the second piston 32, and has a third central hole formed therein for the connecting rod 331 to slide in a sealing manner. The three blocks 33, 34, and 35 form a three-section extraction gun actuator. The lower end of the connecting rod 331 is connected to the second piston 32, and the upper end is connected to the adjusting nut assembly 5. Therefore, the adjusting nut assembly 5 is connected to the second piston rod 321, allowing the position of the bottom valve 22 to be adjusted, even with manufacturing or assembly errors.

[0032] like Figure 1a , 1b As shown in 1c, the actuator also includes a first return spring 37 disposed between the first piston 31 and the second block 35, and a second return spring 36 disposed between the third block 33 and the second piston 32. A first port P1, a second port P2, and a third port P3 are formed on the housing 30. The first port P1 is fluidly connected to a first piston chamber 311 located between the first piston 31 and the first block 34; the second port P2 is fluidly connected to a second piston chamber 312 located between the first piston 31 and the second block 35; and the third port P3 is fluidly connected to a third piston chamber 322 located between the upper side of the second piston 32 and the third block 33.

[0033] The extraction gun also includes solenoid valves to control the flow of working fluid (e.g., pressurized air) into and out of the first port P1, the second port P2, and the third port P3, thereby controlling the position of the valve stem 23 and the bottom valve 22. Those skilled in the art will understand that the solenoid valves used in this invention can be pneumatic or hydraulic, and the type and number of solenoid valves used are not limited to these limitations. Figure 1a ,1b The two-position five-way dual-electro-controlled solenoid valve 6 and the two-position three-way single-electro-controlled solenoid valve 7 shown in 1c are both acceptable as long as they can control the fluid at each port. For example, in... Figure 1a and 1c The image shows an extraction gun including a two-position five-way dual-electro-controlled solenoid valve 6. When the two-position five-way dual-electro-controlled solenoid valve 6 is in position A, which is connected to the third port P3, the gas medium enters the upper side of the second piston 32 through the third port P3. The second piston 32 is driven downward until it abuts against the first block 34. The second piston rod 321 abuts against the first piston rod 39, thereby driving the valve rod 23 and the bottom valve 22 to the sealing position. When the two-position five-way dual-electro-controlled solenoid valve is in position B, which is connected to the first port P1, the first piston 31 is driven downward until it abuts against the second block 35. During this process, the first piston 31 drives the first piston rod 39 to separate from the second piston rod 321. The first piston rod 39 drives the bottom valve 22 to the spray position. The extraction gun also includes a two-position three-way single-electro-controlled solenoid valve 7. When the two-position three-way single-electro-controlled solenoid valve is in the position connected to the second port P2, the first piston 31 is driven upward until it abuts against the first block 34. At this time, the first piston rod 39 drives the bottom valve 22 to move upward to the extraction position.

[0034] The following is in conjunction with the appendix Figure 1a , 1b The operation of the extraction gun of the present invention is described by 1c and 2a-2c.

[0035] At the end of the extraction gun, Figure 1a , 1b In the example of 1c, the lower end of the gun barrel assembly 1, including the valve seat 21 and the bottom valve 22, is submerged below the liquid surface of the fluid material to be extracted in the container. When the extraction gun needs to perform an extraction operation, the two-position three-way single-electro-controlled solenoid valve 7 is actuated to the position connected to the second port P2. Gas enters the second piston chamber 312 between the first piston 31 and the second block 35 through the second port P2. The first piston 31 is driven upward until it abuts against the first block 34, and the first return spring 37 is stretched. At this time, the first piston rod 39 drives the valve rod 23 and the bottom valve 22 to move upward through the connecting shaft 41, reaching the position shown in the image. Figure 1b , 2b The extraction position is shown. In this position, the bottom valve 22 is located above and spaced apart from the valve seat 21. Due to the action of the extraction pump connected to the extraction gun at the connection 12, the fluid material enters from the container through the gap between the bottom valve 22 and the valve seat 21 into the internal channel 11 of the extraction gun, and is then drawn out through the internal channel.

[0036] The extraction gun barrel assembly of the exemplary structure of the present invention, unlike the prior art where the internal material channel diameter is too small due to the construction of a double-walled structure, maximizes the internal channel size by using a single-layer structure. This maximizes material extraction, increases flow rate, significantly improves extraction speed and efficiency, and shortens extraction time. Furthermore, the larger internal channel size gives the extraction gun high extraction capacity, meeting the needs of high-viscosity materials, broadening its applicability to a wider range of materials, and overall improving the extraction efficiency of high-viscosity materials.

[0037] After the fluid material suction volume meets the requirements, the extraction gun is moved to the sealing position. The two-position three-way single-electro-controlled solenoid valve 7 is actuated to the exhaust position, and the two-position five-way double-electro-controlled solenoid valve 7 is actuated to position A, which connects to the third port P3. Gas enters the third piston chamber 322 between the second piston 32 and the third block 33 through the third port P3. The second piston 32 is driven downwards until it abuts against the first block 34. During this process, the second piston rod 321 is driven and abuts against the first piston rod 39. The first piston rod 39, through the connecting shaft 41, drives the valve rod 23 and the bottom valve 22 downwards, reaching the desired position. Figure 1a , 2a The sealing position is shown. In this position, the bottom valve 22 abuts against and seals the valve seat 21, thus preventing fluid material from returning from the extraction gun to the container, or from entering the extraction gun from the container. The extraction gun of the present invention can close promptly after the required amount has been extracted, and prevents fluid material from flowing between the extraction gun and the container, ensuring the accuracy of the extraction volume and avoiding measurement errors.

[0038] When cleaning of containers such as additive tanks is required, the extraction gun is positioned to spray. At this time, the two-position five-way dual-electro-controlled solenoid valve 7 is activated to position B, connected to the first port P1. Gas enters the first piston chamber 311 located between the first piston 31 and the first block 34 through the first port P1. The first piston 31 is driven downwards until it abuts against the cylindrical component 351 on the second block 35. The first piston rod 39 moves downwards under the action of the first piston 31, driving the valve rod 23 and the bottom valve 22 downwards via the connecting shaft 41, reaching the desired position. Figure 1c , 2cThe spraying position is shown. The second piston 32 moves upward under the action of the second return spring 36, and the lower end of the second piston rod 321 separates from the upper end of the first piston rod 39, no longer abutting against each other. In this spraying position, the bottom valve 22 is located below and spaced apart from the valve seat 21. Fluid, such as a cleaning agent, is sprayed from the internal channel 11 of the extraction gun into the container through the gap between the bottom valve 22 and the valve seat 21, driven by the pump, to achieve spray cleaning of the container's inner wall. Through the exemplary structure of this invention, the cleaning of residual, sticky materials adhering to the walls of the container is achieved, minimizing waste of materials in the container, controlling the residual amount to a minimum, reducing waste of expensive materials and environmental pollution, reducing the user's container cleaning costs and the risk of cross-contamination between materials, and also reducing the waste of cleaning processes and cleaning fluid.

[0039] As can be seen, in this invention, by setting a driver, the extraction gun can achieve material sealing (timely closure of the bottom valve to ensure extraction accuracy), extraction (extraction of material in the tank through the internal channel with the maximum diameter), and spraying (tank washing function) in three states. Integrating these three functions into a single-layer gun rod assembly greatly improves the accuracy and efficiency of the extraction system, shortens production time, and can meet the extraction needs of high-viscosity materials, making it applicable to a wider range of materials and improving the overall extraction efficiency of high-viscosity materials.

[0040] The present invention also provides an extraction system using the extraction gun, which is simple to operate, requires no manpower, can improve work efficiency and productivity, and realize automated operation; and can clean the container without cross-contamination, ensuring product quality reliability, improving extraction accuracy, preventing leakage, reducing material loss, and keeping the site clean and free of safety hazards.

[0041] It should be noted that although the preferred arrangement is shown in the figure, i.e., the actuator 3 is located at the upper end of the barrel assembly 1, those skilled in the art will understand that other arrangements can also be adopted, such as arranging the first piston rod 39 of the actuator 3 parallel to the valve rod 23 in the barrel assembly 1 and connecting them through a connecting component to achieve the driving method.

[0042] It should be noted that the embodiments described above should be considered exemplary only, and the present invention is not limited to these embodiments. By considering the content of this specification, those skilled in the art can make various changes and modifications without departing from the scope or spirit of the invention. The true scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An extraction gun, characterized in that, The extraction gun includes: Gun barrel assembly (1), an internal channel (11) is defined within the gun barrel assembly (1), and the gun barrel assembly (1) adopts a single-layer structure to maximize the size of the internal channel; A valve seat (21) is provided at the lower end of the gun barrel assembly (1), a bottom valve (22) that cooperates with the valve seat, and a valve stem (23) that is connected to the bottom valve (22). and the actuator (3), the upper end of the valve stem (23) is connected to the actuator (3) and can move in the internal channel (11) under the drive of the actuator (3), The actuator (3) drives the bottom valve (22) via the valve stem (23) to switch it between three positions relative to the valve seat (21) to integrate sealing, extraction, and spraying functions into a single-layer gun rod assembly: In the sealing position, the bottom valve (22) is attached to and seals the valve seat (21). In the extraction position, the bottom valve (22) is located above and spaced apart from the valve seat (21), and the fluid material enters the internal channel (11) of the extraction gun from the container through the gap between the bottom valve (22) and the valve seat (21), and is drawn out through the internal channel (11). and the spray position, in which the bottom valve (22) is located below the valve seat (21) and spaced apart from the valve seat (21); The actuator (3) includes a first piston (31) disposed within a housing (30) of the actuator (3) and a first piston rod (39) connected to the first piston (31), the first piston rod (39) being connected to the valve rod (23). The first piston (31) can be actuated downward to drive the bottom valve (22) to the spray position, and the first piston (31) can be actuated upward to drive the bottom valve (22) to the extraction position. The actuator (3) further includes a second piston (32) disposed above the first piston (31) within the housing (30) and a second piston rod (321) connected to the second piston (32), wherein the upper end of the first piston rod (39) and the lower end of the second piston rod (321) can abut and separate, wherein the second piston (32) can be actuated downward to abut the first piston rod (39) via the second piston rod (321) to drive the bottom valve (22) to the sealing position.

2. The extraction gun according to claim 1, characterized in that, The actuator further includes: a first block (34) fixed between the first piston (31) and the second piston (32) on the housing (30) of the actuator and limiting the first piston (31) and the second piston (32), wherein the first block (34) has a first central hole formed therein for the second piston rod (321) to slide in a sealing manner; and a second block (35) fixed to the housing (30) of the actuator on the lower side of the first piston (31), wherein the second block (35) has a second central hole formed therein for the first piston rod (39) to slide in a sealing manner.

3. The extraction gun according to claim 2, characterized in that, The housing (30) has a first port (P1), a second port (P2) and a third port (P3) for the entry and exit of working fluid. The first port (P1) is fluidly connected to a first piston chamber (311) located between the first piston (31) and the first block (34). The second port (P2) is fluidly connected to a second piston chamber (312) located between the first piston (31) and the second block (35). The third port (P3) is fluidly connected to a third piston chamber (322) located on the upper side of the second piston (32).

4. The extraction gun according to claim 3, characterized in that, The extraction gun also includes a solenoid valve for controlling the flow of working fluid into and out of the first port (P1), the second port (P2), and the third port (P3).

5. The extraction gun according to claim 4, characterized in that, The solenoid valve includes a two-position five-way dual-electric solenoid valve. When the two-position five-way dual-electric solenoid valve is in position A, which is connected to the third port (P3), the second piston (32) is driven downward until it abuts against the first block (34), and the second piston rod (321) abuts against the first piston rod (39), thereby driving the bottom valve to the sealing position. When the two-position five-way dual-electric solenoid valve is in position B, which is connected to the first port (P1), the first piston (31) is driven downward until it abuts against the second block (35), and the first piston rod (39) separates from the second piston rod (321), driving the bottom valve (22) to the spray position.

6. The extraction gun according to claim 5, characterized in that, The solenoid valve also includes a two-position three-way single-electro-controlled solenoid valve. When the two-position three-way single-electro-controlled solenoid valve is in the position connected to the second port (P2), the first piston (31) is driven upward until it abuts against the first block (34). At this time, the first piston rod (39) drives the bottom valve (22) to the extraction position.

7. The extraction gun according to any one of claims 2-6, characterized in that, The actuator also includes a first return spring (37) disposed between the first piston (31) and the second block (35).

8. The extraction gun according to claim 7, characterized in that, The actuator also includes a third block (33) fixed on the upper side of the second piston (32) to the housing (30) of the actuator, and a second return spring (36) disposed between the third block (33) and the second piston (32).

9. The extraction gun according to any one of claims 1-6, characterized in that, The actuator also includes an adjusting nut assembly (5) disposed at the upper end of the housing (30) of the actuator, wherein the adjusting nut assembly (5) is connected to the second piston rod (321) to adjust the position of the bottom valve (22).

10. An extraction system, characterized in that, The extraction system includes an extraction gun according to any one of claims 1-9.

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