CN217708882U - Extraction gun and extraction system comprising same - Google Patents

Abstract

The utility model relates to an extract rifle and including this extraction system of extracting rifle. The extraction gun comprises: a gun bar assembly (1); a valve seat (21) arranged at the lower end of the gun rod assembly (1), a bottom valve (22) matched with the valve seat and a valve rod (23) connected to the bottom valve (22); and an actuator (3) disposed on the gun bar assembly, wherein an upper end of the valve stem is coupled to the actuator (3), the actuator (3) actuating the base valve via the valve stem to shift it relative to the valve seat between three positions: a sealing position; an extraction position in which the foot valve (22) is above the valve seat (21) and spaced from the valve seat (21); and a spray position wherein the base valve is located below the valve seat and spaced from the valve seat (21). The utility model discloses a to seal, extract and spray three kinds of functions integration in a individual layer barral of a gun subassembly, improved the integration level of extracting the system greatly, extracted the precision, extracted efficiency and cleaning performance.

Description

Extraction gun and extraction system comprising same

Technical Field

The utility model relates to an extraction system that is arranged in pumping fluid material in the production of fluid material of trades such as chemical industry, food, more specifically relates to the extraction rifle that uses in the extraction system.

Background

An extraction system for pumping fluid materials is commonly used in the production of fluid materials in the industries of chemical engineering, food and the like. For example, in the blending production of lubricating oil in the petrochemical field, a large amount of additive needs to be added in bulk to blend the lubricating oil which is suitable for the lubricating requirements of different equipment or vehicles, so that an additive extraction system exists in the prior art. In extraction systems for these fluid materials, an extraction lance is often used, which is connected to an extraction pump to draw the fluid material from the drum under the drive of the extraction pump, after which the fluid material is conveyed, for example, via a pipeline into a tempering tank or the like.

Existing extraction lances are usually not provided with a bottom valve, so that the lower end of the extraction lance has no sealing function. The extraction gun cannot be closed and sealed in time when the extraction amount reaches the required amount, so that the extraction precision is poor. The function of a cleaning shower for a container, such as a bucket, containing fluid material cannot be realized.

In the prior art, although some extraction guns of the DDU extraction system can realize the functions of sealing and cleaning spraying, the extraction gun needs to be made into a sandwich structure, that is, the wall of the extraction gun comprises an inner wall and an outer wall, a spraying channel is defined between the inner wall and the outer wall, a spraying hole is formed on the outer wall, and the inner wall defines an internal material channel for extracting fluid materials. The cleaning liquid is conveyed via the spray channel and sprayed through the spray holes onto the wall of the tub to be cleaned. Because the outer diameter of the extraction gun is limited by the size of the barrel opening, and the extraction gun with the interlayer reduces the inner diameter of the internal material channel to a great extent, the material extraction efficiency is low, the extraction effect is poor, and high-viscosity materials cannot be extracted from the barrel in a short time, which is the biggest pain point of an additive extraction system and the technical problem which is difficult to overcome.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to solve at least one of the above problems and/or other drawbacks existing in the prior art.

Therefore, the utility model provides an exemplary extraction gun, which comprises a gun rod component, a valve seat arranged at the lower end of the gun rod component, a bottom valve matched with the valve seat, a valve rod connected to the bottom valve, and a driver arranged on the gun rod component; wherein an internal passage is defined within the gun shaft assembly, an upper end of the valve stem is coupled to the actuator and moves within the internal passage upon actuation by the actuator, wherein the actuator actuates the base valve via the valve stem to transition between three positions relative to the valve seat: a sealing position wherein the base valve engages and seals the valve seat; an extraction position wherein the foot valve is above and spaced from the valve seat; and a spray position wherein the base valve is spaced below the valve seat.

In this example, an internal passage is provided in the gun stem assembly that allows the valve stem to move therein, and an actuator is provided to actuate the valve stem to move the foot valve between three positions relative to the valve seat, such that the extraction gun achieves sealing, extraction, and spraying in three states. The spray can be realized without arranging an interlayer on the lance component, so that the inner diameter of the internal channel of the lance is maximized, the extraction efficiency of the extraction system is greatly improved, the production time is shortened, the maximized internal channel can meet the suction requirement of high-viscosity materials, the range of applicable materials is wider, and the extraction efficiency of the high-viscosity materials is integrally improved; furthermore, the spraying function of the extraction gun realizes the cleaning of adherent viscous liquid of a container such as a barrel, the residual waste of materials in the barrel is reduced to the maximum extent, the residual quantity is controlled to the minimum, the waste of expensive materials and the pollution to the environment are reduced, the cost of barrel washing by a user and the risk of cross contamination among the materials are reduced, and the cleaning process and the waste of cleaning liquid are reduced; the sealing function ensures that the bottom valve can be closed in time, and the requirement of extraction precision is met. And three functions of sealing, extracting and spraying are integrated in a single-layer gun rod assembly, so that the integration level, the automation degree, the extracting precision, the extracting efficiency and the cleaning effect of the extracting system are greatly improved.

According to an example of the present invention, the driver comprises a first piston arranged within a housing of the driver and a first piston rod connected to the first piston, wherein the first piston rod is coupled to the valve rod, the first piston being actuatable downwards to drive the bottom valve to the spraying position and upwards to drive the bottom valve to the extraction position.

In the example, the valve rod is connected through the piston rod to drive the bottom valve to reach the position below the valve seat so as to realize spraying, and the spraying and extracting functions are realized through a simple structure.

According to an example of the invention, the drive further comprises a second piston arranged in 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 can be abutted and separated, wherein the second piston can be actuated downwards to drive the bottom valve to a sealing position against the first piston rod via the second piston rod.

In this example, by further providing the second piston and driving the bottom valve by the cooperation of the second piston rod and the first piston rod to realize sealing, the integration of the spraying function, the extracting function and the sealing function is simultaneously realized with a simple structure.

According to an example of the present invention, the actuator further comprises a first block fixed in the housing of the actuator 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 hermetically therein; the actuator further comprises a second block-shaped body fixed in the housing of the actuator at the lower side of the first piston, wherein a second central hole is formed in the second block-shaped body for the first piston rod to slide sealingly therein.

In the structure of this example, the positions of the first piston and the second piston are limited by providing the first block-shaped body and the second block-shaped body, and the piston function is realized with a simple structure.

According to an example of the present invention, the housing is formed with a first port, a second port and a third port, the first port being in fluid communication with a first piston chamber located between the first piston and the first block, the second port being in fluid communication with a second piston chamber located between the first piston and the second block, and the third port being in fluid communication with a third piston chamber at an upper side of the second piston.

According to an example of the present invention, the extraction gun further comprises a solenoid valve for controlling fluid flow in and out of the first port, the second port and the third port.

According to an example of the present invention, the solenoid valve comprises a two-position five-way dual electric control solenoid valve, wherein when the two-position five-way dual electric control solenoid valve is located at a position a communicated with the third port, the second piston is driven downwards until abutting against the first blocky body, the second piston rod abuts against the first piston rod and further drives the bottom valve to reach a sealing position; and when the two-position five-way dual-electric control electromagnetic valve is positioned at the position B communicated with the first port, the first piston is driven downwards until the first piston abuts against the second block-shaped body, the first piston rod is separated from the second piston rod, and the bottom valve is driven to reach a spraying position.

According to the utility model discloses an example, the solenoid valve still includes two tee bend single electric solenoid valves, and when two tee bend single electric solenoid valves are located the position that is linked together with the second port, first piston is upwards driven until leaning on to lean on first blocky body, and first piston rod drives the bottom valve and reachs the extraction position this moment.

According to an example of the present invention, the actuator further comprises a first return spring arranged between the first piston and the second block-shaped body.

According to an example of the invention, the driver further comprises a third block fixed in the housing of the driver above the second piston and a second return spring arranged between the third block and the second piston.

According to an example of the present invention, the actuator further comprises an adjustment nut assembly provided at an upper end of the housing of the actuator, wherein the adjustment nut assembly is coupled to the second piston rod for position adjustment of the foot valve. This enables the base valve to be adjusted to the appropriate position relative to the valve seat even in the presence of manufacturing or assembly errors.

According to another aspect of the present invention, there is provided an extraction system comprising the extraction lance of each of the above examples.

According to the utility model discloses an extract rifle and extraction system of each example have following at least one item beneficial effect: three functions of sealing, extracting and spraying are integrated in a single-layer gun rod assembly, so that the integration level, the precision and the efficiency of the extracting gun are greatly improved; the size of the internal channel of the lance assembly is maximized, the extraction speed and the extraction efficiency are greatly improved, and the extraction time is shortened; the requirement of sucking high-viscosity materials is met, and the range of applicable materials is wider; the cleaning of the residual adherent viscous liquid in the barrel can be realized, the residual waste of materials in the barrel is reduced to the maximum extent, the residual quantity is controlled to the minimum, the waste of expensive materials and the pollution to the environment are reduced, the cost of barrel cleaning by a user and the risk of cross contamination among the materials are reduced, and the cleaning process and the waste of cleaning liquid are reduced; the whole extraction system is simple to operate, high in automation degree and capable of improving working efficiency and productivity; cross contamination is avoided, and the quality reliability of the product is ensured; no leakage, reduced material loss, clean site and no potential safety hazard.

Drawings

The above and other features and advantages of the present invention will become apparent from the detailed description provided hereinafter with reference to the accompanying drawings. It is to be understood that the following drawings are merely illustrative and are not necessarily drawn to scale and are not to be considered limiting of the application, in which:

fig. 1a, 1b and 1c show a schematic cross-sectional view of an extraction gun according to an exemplary embodiment of the present invention in a sealing position, an extraction position and a spraying position, respectively; and

fig. 2a, 2b and 2c schematically show the valve seat and the bottom valve in the sealing position, the extraction position and the spraying position, respectively.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding and enabling description of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it is to be understood that the invention is not to be limited to the specific embodiments described. Rather, any combination of the various features and elements described below is contemplated as being suitable for practicing the present invention, whether or not they relate to different exemplary embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the claims except where explicitly recited in a claim(s).

It should be noted that the directions or positional relationships referred to in the present invention are the directions or positional relationships based on the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but not for indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the embodiments of the present invention. Moreover, these orientations or positional relationships are merely relative concepts in three-dimensional space and can vary depending on the different positions and different conditions of use of the extraction gun. These and other directional terms should therefore not be construed as limiting terms.

It should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" in the description of the embodiments of the present invention are to be interpreted broadly, and may be, for example, a fixed connection, such as welded, etc., or a detachable connection, such as screwed, snapped, etc.; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations. It should also be noted that "coupled" herein refers to various ways of coupling different parts together to make them move together, including ways in which two parts are indirectly coupled together through other intermediate parts, and ways in which two parts are directly coupled together.

Furthermore, terms such as "first," "second," and the like, are used herein to describe elements of the present application and are used solely to distinguish one element from another without limitation to the nature, sequence, order, or number of such elements.

Referring to fig. 1a, 1b and 1c, an extraction gun according to an exemplary embodiment of the present invention is shown. The extraction gun comprises a lance assembly 1 on the lower side in fig. 1a, 1b and 1c, the lance assembly 1 being hollow and defining an internal passage 11 inside. The lance assembly 1, as shown in fig. 1a, 1b and 1c, comprises a connection 12 which is connected to an extraction pump (not shown) for pumping fluid material (e.g. additives) out of a container (e.g. a barrel) via an internal passage 11 or for pumping fluid (e.g. cleaning agents) into the container via the internal passage 11. The extraction gun also comprises a valve seat 21 arranged at the lower end of the gun rod component 1, a bottom valve 22 matched with the valve seat and a valve rod 23 connected to the bottom valve 22; the extraction lance further comprises an actuator 3 arranged at the upper end of the lance assembly 1, wherein the upper end of a valve stem 23 is coupled to the actuator 3 and can be moved reciprocally up and down in the inner passage 11 under the actuation of the actuator 3, wherein the actuator 3 actuates the base valve 22 via the valve stem 23 to switch it relative to the valve seat 21 between a sealing position, an extraction position and a spray position as shown in fig. 2a, 2b and 2 c. In the sealing position shown in fig. 1a, 2a, the bottom valve 22 abuts and seals against the valve seat 21, thus preventing fluid material from returning from the extraction lance into the container or from entering the extraction lance from the container. In the extraction position shown in fig. 1b, 2b, the foot valve 22 is located above the valve seat 21 and spaced apart from the valve seat 21, and fluid material is sucked out from the container into the extraction lance via the gap between the foot valve 22 and the valve seat 21 by means of an extraction pump communicating with the extraction lance. In the spray position shown in fig. 1c, 2c, the base valve 22 is located below the valve seat 21 and spaced apart from the valve seat 21. A fluid, for example a cleaning agent, is sprayed into the container from the internal channel 11 of the extraction gun via the gap between the foot valve 22 and the valve seat 21 to effect spray cleaning of the inner wall of the container.

As shown in fig. 1a, 1b and 1c, the driver 3 comprises a first piston 31 arranged within the housing 30 of the driver 3 and a first piston rod 39 connected to the first piston 31, wherein the first piston rod 39 is coupled to the valve stem 23, e.g. by a coupling. The actuator 3 further comprises a second piston 32 arranged in the housing 30 at the upper side of the first piston 31 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 be separated from the upper end of the first piston rod 39. The drive further comprises a first block 34, a second block 35 and a third block 33 fixed to the housing 30 of the drive. The first block 34 is located between the first piston 31 and the second piston 32, and is capable of limiting 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. A second block-shaped body 35 is fixed to the housing 30 of the actuator on the lower side of the first piston 31, which second block-shaped body 35 has a second central hole formed therein, in which the first piston rod 39 slides sealingly. The third block 33 is fixed to the housing 30 of the actuator at an upper side of the second piston 32, and has a third center hole formed therein, in which the connecting rod 331 is sealingly slid. A three-part extraction gun drive is formed by the three blocks 33, 34 and 35. And, the lower end of the connection rod 331 is connected to the second piston 32, and the upper end is connected to the adjustment nut assembly 5. The adjusting nut assembly 5 is thus coupled to the second piston rod 321, so that the position of the base valve 22 can be adjusted by the adjusting nut assembly 5, which enables the position of the base valve 22 relative to the valve seat 21 to be adjusted even in the presence of manufacturing or assembly errors.

As shown in fig. 1a, 1b and 1c, the drive further comprises a first return spring 37 arranged between the first piston 31 and the second block 35, and a second return spring 36 arranged 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 being in fluid communication with a first piston chamber 311 between the first piston 31 and the first block 34, the second port P2 being in fluid communication with a second piston chamber 312 between the first piston 31 and the second block 35, and the third port P3 being in fluid communication with a third piston chamber 322 between the upper side of the second piston 32 and the third block 33.

The extraction gun also includes solenoid valves to control the flow of a working fluid (e.g., pressurized air) into and out of the first port P1, the second port P2, and the third port P3 to effect control of the position of the valve stem 23 and the foot valve 22. Those skilled in the art will understand that the solenoid valve used in the present invention may be a gas circuit solenoid valve or a liquid circuit solenoid valve, and the type and number of the solenoid valves used are not limited to the two-position five-way dual electric control solenoid valve 6 and the two-position three-way single electric control solenoid valve 7 shown in fig. 1a, 1b and 1c, as long as the control of each port and the working fluid can be realized. Exemplarily, in fig. 1a and 1c it is shown that the extraction gun comprises a two-position five-way dual electric solenoid valve 6, wherein when the two-position five-way dual electric solenoid valve 6 is in position a in communication with the third port P3, the gaseous medium enters the upper side of the second piston 32 through the third port P3, the second piston 32 is driven downwards until abutting against the first block 34, the second piston rod 321 abuts against the first piston rod 39 and drives the valve rod 23 and the bottom valve 22 to the sealing position; and when the two-position five-way dual-electric control solenoid valve is located at the position B communicated with the first port P1, the first piston 31 is driven downwards until abutting against the second block-shaped body 35, in the process, the first piston 31 drives the first piston rod 39 to be separated from the second piston rod 321, and the first piston rod 39 drives the bottom valve 22 to reach the spraying position. The extraction gun further comprises a two-position three-way single electric control solenoid valve 7, when the two-position three-way single electric control solenoid valve is located at a position communicated with the second port P2, the first piston 31 is driven upwards until abutting against the first block body 34, and at the moment, the first piston rod 39 drives the bottom valve 22 to move upwards to reach an extraction position.

The operation of the extraction gun according to the invention will be described below with reference to fig. 1a, 1b and 1c and 2a-2 c.

The end of the extraction lance, which in the example of fig. 1a, 1b and 1c is the lower end of the lance assembly 1, including the valve seat 21 and the foot valve 22, is submerged below the level of the fluid material to be pumped in the vessel. When the extraction gun needs to perform extraction operation, the two-position three-way single-electric-control solenoid valve 7 is actuated to a position communicated with the second port P2, gas enters the second piston cavity 312 between the first piston 31 and the second block-shaped body 35 through the second port P2, the first piston 31 is driven upwards until abutting against the first block-shaped body 34, the first return spring 37 is stretched, and at the moment, the first piston rod 39 drives the valve rod 23 and the bottom valve 22 to move upwards through the connecting shaft 41, so that the extraction position shown in fig. 1b and 2b is reached. In this position, the foot valve 22 is located above the valve seat 21 and spaced from the valve seat 21, and fluid material is drawn from the container into the internal passage 11 of the extraction lance via the gap between the foot valve 22 and the valve seat 21 and out via the internal passage, as a result of the action of the extraction pump communicating with the extraction lance at the connection 12.

The utility model discloses an exemplary structure's rifle bar subassembly of extraction rifle no longer leads to inside material passageway's diameter undersize owing to set up the intermediate layer promptly double-walled as among the prior art, makes the inside passage size maximize owing to used single-layer structure, and the extraction of realization material that can the at utmost makes the flow maximize, has improved extraction speed and extraction efficiency greatly, has shortened the extraction time. And the extraction gun has high extraction capacity due to the large size of the internal channel, the requirement of sucking high-viscosity materials is met, the range of applicable materials is wider, and the extraction efficiency of the high-viscosity materials is integrally improved.

After the amount of fluid material pumped meets the demand, the extraction lance is brought into a sealing position. The two-position three-way single electric control solenoid valve 7 is actuated to the exhaust position, the two-position five-way double electric control solenoid valve 7 is actuated to the position A communicated with the third port P3, gas enters the third piston cavity 322 between the second piston 32 and the third block 33 through the third port P3, the second piston 32 is driven downwards until abutting against the first block 34, in the process, the second piston rod 321 is driven and abuts against the first piston rod 39, and the first piston rod 39 drives the valve rod 23 and the bottom valve 22 to move downwards through the connecting shaft 41 to reach the sealing position shown in figures 1a and 2 a. In this position, the bottom valve 22 abuts and seals against the valve seat 21, thus preventing fluid material from returning from the extraction lance into the container or from entering the extraction lance from the container. The utility model discloses an extract the rifle and can in time close after extracting required volume to prevent fluid material to flow between extraction rifle and container, guarantee to extract the precision of volume, avoid metering error.

When cleaning of a container, such as an additive tank, is required, the extraction gun is brought into a spraying position. At this time, the two-position five-way dual-electric-control electromagnetic valve 7 is actuated to a position B communicated with the first port P1, gas enters the first piston cavity 311 between the first piston 31 and the first block body 34 through the first port P1, the first piston 31 is driven to move downwards until the gas abuts against the cylindrical part 351 on the second block body 35, the first piston rod 39 is driven by the first piston 31 to move downwards, the valve rod 23 and the bottom valve 22 are driven by the coupling shaft 41 to move downwards, and the spraying position shown in fig. 1c and 2c is reached. The second piston 32 moves upward by the second return spring 36, and the lower end of the second piston rod 321 is separated from the upper end of the first piston rod 39 and no longer abuts against each other. In the spray position, the base valve 22 is located below the valve seat 21 and spaced from the valve seat 21. A fluid, for example a cleaning agent, is sprayed into the container from the internal channel 11 of the extraction lance via the gap between the foot valve 22 and the valve seat 21 under the drive of a pump, so that a spray cleaning of the inner wall of the container is achieved. Through the utility model discloses an exemplary structure realizes remaining the washing of adherence viscous material in to the bucket, and the waste of remaining of material in the at utmost reduction bucket is controlled to minimumly with the residual volume, reduces the waste of expensive material and to the pollution of environment to reduce the cost that the user washed the bucket and the risk of cross contamination between the material, reduced the waste of cleaning process and washing liquid moreover.

It is thus clear that the utility model discloses in, through setting up the driver for extract the rifle and realize under three kinds of states that sealed (the bottom valve in time closes and realizes extracting the precision), extract (extracting the interior material of bucket through the inside passage of biggest latus rectum), spray (tub function). Integrate three kinds of functions in a individual layer barral of a gun subassembly, improved the precision and the efficiency of extracting the system greatly, shortened production time to can satisfy the suction needs of high viscosity material, the applicable material scope is wider, has also improved the extraction efficiency of high viscosity material on the whole.

The utility model also provides an extraction system using the extraction gun, which has simple operation, does not need manpower, can improve the working efficiency and the production efficiency and realizes automatic operation; the container can be cleaned without cross contamination, the quality reliability of the product is ensured, the extraction precision is improved, no leakage exists, the material loss is reduced, the site is clean, and no potential safety hazard exists.

It should be noted that although the preferred arrangement is shown in the figures, i.e. the actuator 3 is provided at the upper end of the gun bar assembly 1, it will be appreciated by those skilled in the art that other arrangements are possible, for example using a first piston rod 39 of the actuator 3 arranged parallel to the valve stem 23 in the gun bar assembly 1 and coupled by a coupling means to effect actuation.

It should be noted that the above-described embodiments should be regarded as merely exemplary, and the present invention is not limited to these embodiments. Upon consideration of the present specification, those skilled in the art can make various changes and modifications without departing from the scope or spirit of the present invention. The true scope of the invention is defined by the following claims and their equivalents.

Claims (12)

1. An extraction lance, characterized in that the extraction lance comprises:

a barrel assembly (1) defining an internal passage (11) within the barrel assembly (1);

a valve seat (21) arranged at the lower end of the gun rod assembly (1), a bottom valve (22) matched with the valve seat and a valve rod (23) connected to the bottom valve (22); and

an actuator (3), an upper end of the valve stem (23) being coupled to the actuator (3) and being movable in the internal passage (11) under actuation of the actuator (3), wherein the actuator (3) actuates the base valve (22) via the valve stem (23) to switch between three positions relative to the valve seat (21):

a sealing position in which the base valve (22) abuts and seals against the valve seat (21);

an extraction position in which the foot valve (22) is above the valve seat (21) and spaced from the valve seat (21); and

a spray position in which the foot valve (22) is located below the valve seat (21) and spaced from the valve seat (21).

2. Extraction gun according to claim 1, characterized in that the actuator (3) comprises a first piston (31) arranged in 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 coupled to the valve rod (23); wherein the first piston (31) can be actuated downwards to bring the foot valve (22) to the spraying position and the first piston (31) can be actuated upwards to bring the foot valve (22) to the extraction position.

3. Extraction gun according to claim 2, characterized in that the driver (3) further comprises a second piston (32) arranged in the housing (30) above the first piston (31) and a second piston rod (321) connected to the second piston (32), the upper end of the first piston rod (39) and the lower end of the second piston rod (321) being abuttable and separable, wherein the second piston (32) can be actuated downwards to drive the bottom valve (22) to the sealing position via the second piston rod (321) abutting the first piston rod (39).

4. The extraction gun of claim 3, wherein the driver further comprises:

a first block body (34) fixed on the housing (30) of the driver between the first piston (31) and the second piston (32) and limiting the first piston (31) and the second piston (32), wherein a first central hole for the second piston rod (321) to slide hermetically therein is formed in the first block body (34); and

a second block-shaped body (35) fixed on the housing (30) of the drive on the lower side of the first piston (31), wherein a second central hole is formed in the second block-shaped body (35) in which the first piston rod (39) slides sealingly.

5. Extraction gun according to claim 4, wherein the housing (30) is formed with a first port (P1), a second port (P2) and a third port (P3) for the ingress and egress of a working fluid, the first port (P1) being in fluid communication with a first piston chamber (311) between the first piston (31) and the first block (34), the second port (P2) being in fluid communication with a second piston chamber (312) between the first piston (31) and the second block (35), and the third port (P3) being in fluid communication with a third piston chamber (322) on the upper side of the second piston (32).

6. The extraction gun according to claim 5, characterized in that it further comprises solenoid valves for controlling the working fluid to and from the first port (P1), the second port (P2) and the third port (P3).

7. Extraction gun according to claim 6, characterized in that the solenoid valve comprises a two-position five-way dual electric solenoid valve, wherein when the two-position five-way dual electric solenoid valve is in the A position in communication with the third port (P3), the second piston (32) is driven down until it abuts against the first block (34), the second piston rod (321) abuts against the first piston rod (39) and thereby drives the bottom valve to the sealing position; and is provided with

When the two-position five-way dual-electric control electromagnetic valve is located at a position B communicated with the first port (P1), the first piston (31) is driven downwards until the first piston abuts against the second block body (35), the first piston rod (39) is separated from the second piston rod (321), and the bottom valve (22) is driven to reach the spraying position.

8. Extraction gun according to claim 7, characterized in that the solenoid valve further comprises a two-position three-way single solenoid valve, which when in a position in communication with the second port (P2), the first piston (31) is driven upwards until it abuts against the first block (34), at which time the first piston rod (39) drives the bottom valve (22) to the extraction position.

9. Extraction gun according to any of claims 4-8, characterized in that the drive further comprises a first return spring (37) arranged between the first piston (31) and the second block-shaped body (35).

10. Extraction gun according to claim 9, characterized in that the drive further comprises a third block (33) fixed to the housing (30) of the drive on the upper side of the second piston (32) and a second return spring (36) arranged between the third block (33) and the second piston (32).

11. Extraction gun according to any of claims 3-8, characterized in that the drive further comprises an adjustment nut assembly (5) arranged at the upper end of the drive housing (30), wherein the adjustment nut assembly (5) is coupled to the second piston rod (321) for adjusting the position of the foot valve (22).

12. Extraction system, characterized in that it comprises an extraction lance according to any of claims 1-11.

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