Quantitative extraction-based semi-automatic sampler for oil product water measurement and quantitative extraction method

Abstract

The invention relates to the related technical field of oil product detection, in particular to a semi-automatic sampler for oil product water measurement based on quantitative extraction and a quantitative extraction method, and the semi-automatic sampler for oil product water measurement based on quantitative extraction comprises a barrel and a piston arranged in the barrel in a sealed and sliding mode; the push-pull mechanism is arranged in the barrel body and connected with the piston, and the push-pull mechanism can drive the piston to move in the barrel body in the axial direction of the barrel body so as to extract sample oil into the barrel body or discharge the sample oil from the barrel body through a telescopic pipe body structure arranged at the end part of the barrel body; the two protective shells are movably arranged at the end part of the barrel body, and before use, the two protective shells are in a closed state, and at the moment, the two protective shells form a protective cavity capable of isolating the telescopic pipe body structure from the outside, so that the telescopic pipe body structure is shielded, and the problem of oil product pollution caused by dripping of sample oil after sampling is finished and in a transfer process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field related to oil product detection, and in particular to a semi-automatic oil product water detection sampler based on quantitative extraction and a quantitative extraction method. Background Art

[0002] During the process of receiving, storing, distributing and preparing for jet fuel filling to aircraft, it is necessary to extract jet fuel samples for testing with a trace moisture chemical water detector. Only after the test is qualified can the related operations of receiving, storing, distributing and preparing for jet fuel filling to aircraft be carried out.

[0003] However, the suction heads of existing samplers are usually exposed to the outside world. After sampling, the oil remaining on the suction head is prone to dripping or being accidentally contaminated by the staff during the transfer of the sampler. Some samplers are equipped with a detachable protective shell at the end, which needs to be disassembled and assembled by the staff before and after sampling. Therefore, the staff needs to touch the protective shell, which may still cause oil contamination. Summary of the invention

[0004] The object of the present invention is to provide a semi-automatic oil product water testing sampler and a quantitative extraction method based on quantitative extraction, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A semi-automatic oil product water testing sampler based on quantitative extraction, comprising a cylinder and a piston sealingly and slidingly arranged in the cylinder;

[0007] Also includes:

[0008] A push-pull mechanism is disposed in the cylinder and connected to the piston, and the push-pull mechanism can drive the piston to move in the cylinder along the axial direction of the cylinder, so as to extract the sample oil into the cylinder or discharge the sample oil from the cylinder through the telescopic tube structure disposed at the end of the cylinder;

[0009] A protective shell, two of which are movably provided at the end of the cylinder, and when the two protective shells are butted together, a protective chamber can be formed, and the telescopic tube structure is located in the protective chamber, and the two protective shells are each connected to a group of pulling mechanisms, and the pulling mechanisms are used to drive the protective shells to move along the radial direction of the cylinder, so that the two protective shells can perform an opening and closing action;

[0010] The locking mechanism is connected to the push-pull mechanism and is used to lock the position of the piston. Whenever the locking mechanism locks or unlocks the piston, the pulling mechanism is triggered.

[0011] As a further solution of the present invention: two guide protrusions are fixed on the outer wall of the cylinder, a kit is provided on the sliding sleeve of the guide protrusion, the kit is fixedly connected to the protective shell, the kit is connected to the pulling mechanism, and a pulley is also installed on the inner wall of the protective shell, the pulley cooperates with the telescopic tube body structure and can prompt the telescopic tube body structure to perform a telescopic action.

[0012] As a further solution of the present invention: the telescopic tube structure comprises a first tube member fixed to the end of the cylinder and connected to the cylinder, and a second tube member sealingly and slidably sleeved with the first tube member, wherein the second tube member is connected to two sets of elastic connection components;

[0013] Wherein, a driven plate is fixed on the outer wall of the second pipe, and a connected flat surface and an inclined surface are formed on the driven plate. When the two protective shells are in a closed state, the pulley abuts against the flat surface, and when the two protective shells are in an open state, the pulley abuts against the inclined surface.

[0014] As a further solution of the present invention: the elastic connection assembly includes a guide column fixed to the end of the cylinder and a second cylindrical spring sleeved on the outer periphery of the guide column, and the guide column passes through a lug fixed on the outer wall of the second pipe and is slidably connected to the lug.

[0015] As a further solution of the present invention: an assembly plate is fixed in the cylinder, the push-pull mechanism comprises a rotating tube rotatably mounted on the assembly plate and a push-pull rod slidably sleeved with the rotating tube, and one end of the push-pull rod is fixed to the piston;

[0016] Wherein, a truncated table is fixedly provided at one end of the rotating tube facing the piston, and a first cylindrical spring is sleeved on the outer periphery of the push-pull rod, and two ends of the first cylindrical spring are respectively connected to the piston and the truncated table.

[0017] As a further solution of the present invention: two strip-shaped protrusions are fixedly provided on the outer wall of the push-pull rod, and two strip-shaped grooves are provided on the inner wall of the rotating tube, and the strip-shaped grooves are adapted to the strip-shaped protrusions, and both are parallel to the central axis of the push-pull rod and the rotating tube, and the rotating tube is connected to the pulling mechanism.

[0018] As a further solution of the present invention: the locking mechanism includes a locking rod fixed on the push-pull rod, and a locking groove adapted to the locking rod is provided on the outer wall of the cylinder. The end of the locking rod away from the push-pull rod extends into the locking groove and is slidably connected with the cylinder. The locking groove includes a first arc groove, a straight groove and a second arc groove that are connected. The straight groove is arranged along the axial direction of the cylinder, and the lengths of the first arc groove and the second arc groove are equal.

[0019] As a further solution of the present invention: a shell is also fixed on the outer wall of the cylinder, and the pulling mechanism includes a disc rotatably mounted in the shell and a connecting rod with one end rotatably connected to the eccentric part of the disc, and the end of the connecting rod away from the disc is connected to the kit through a follower structure;

[0020] Wherein, a second bevel gear is fixedly mounted on the rotating shaft of the disc, a first bevel gear is fixedly mounted on the rotating tube, and the first bevel gear is meshed with the second bevel gear.

[0021] As a further solution of the present invention: the follower structure includes a push rod slidably arranged on the side of the shell, the end of the connecting rod away from the disc is rotatably connected to the push rod, the end of the push rod away from the connecting rod is connected to the kit through a follower rod, and the two ends of the follower rod are respectively rotatably connected to the kit and the push rod.

[0022] The method for quantitative extraction of oil products, using the semi-automatic oil product water testing sampler based on quantitative extraction, comprises the following steps:

[0023] Step 1: Control the locking mechanism to release the position locking state of the piston, so that the pulling mechanism is triggered, driving the protective shell to move along the radial direction of the cylinder, the two protective shells are opened, and the telescopic tube structure performs an extension action;

[0024] Step 2: The piston is driven to slide in the cylinder body along the axial direction of the cylinder body away from the protective shell by the push-pull mechanism, and the locking mechanism controls the piston to have a fixed stroke, so that the sample oil is quantitatively extracted into the cylinder body through the telescopic tube structure;

[0025] Step three, control the locking mechanism to lock the position of the piston, and trigger the pulling mechanism again to retract the two protective shells.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] Two protective shells are movably arranged at the end of the cylinder. Before use, the two protective shells are in a closed state. At this time, the two protective shells form a protective chamber that can isolate the telescopic tube structure from the outside world, and shield the telescopic tube structure to prevent the sample oil from dripping during the transfer process after the sampling is completed, which may cause oil product contamination.

[0028] A first arc groove, a straight groove and a second arc groove are connected on the outer wall of the cylinder. On the one hand, the position of the piston can be locked to prevent the staff from accidentally pushing the push-pull rod during the transfer process, causing the sample oil to overflow. On the other hand, when extracting, the locking rod reaches the connection between the straight groove and the second arc groove to perform the locking operation on the piston. Therefore, when extracting, the movement stroke of the piston is fixed, thereby realizing the function of quantitative extraction of samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic structural diagram of an embodiment of a semi-automatic oil product water testing sampler based on quantitative extraction.

[0030] Figure 2 This is a schematic structural diagram from another angle of an embodiment of a semi-automatic oil product water testing sampler based on quantitative extraction.

[0031] Figure 3 The present invention is a structural schematic diagram of another angle of an embodiment of a semi-automatic oil product water testing sampler based on quantitative extraction.

[0032] Figure 4 This is a schematic diagram of the internal structure of a cylinder in an embodiment of a semi-automatic oil sampler for water testing based on quantitative extraction.

[0033] Figure 5 This is a schematic structural diagram of another angle inside the cylinder of an embodiment of a semi-automatic oil sampler for water testing based on quantitative extraction.

[0034] Figure 6 A partial cross-sectional view of an embodiment of a semi-automatic oil sampler for water testing based on quantitative extraction.

[0035] Figure 7 This is a structural explosion diagram of the telescopic tube structure in one embodiment of a semi-automatic oil sampler for water testing based on quantitative extraction.

[0036] Figure 8 for Figure 7 A magnified view of the structure at center.

[0037] Fig. 9 This is a structural explosion diagram of the push-pull mechanism in one embodiment of a semi-automatic oil sampler for water testing based on quantitative extraction.

[0038] Fig.10 The present invention is a schematic diagram of the connection relationship between the push-pull mechanism and the pulling mechanism in one embodiment of a semi-automatic oil sampler for water testing based on quantitative extraction.

[0039] In the figure: 1, cylinder; 101, first arc groove; 102, straight groove; 103, second arc groove; 2, shell; 3, protective shell; 4, piston; 5, push-pull rod; 501, strip protrusion; 6, rotating tube; 601, strip groove; 7, first cylindrical spring; 8, frustum; 9, first bevel gear; 10, second bevel gear; 11, disc; 12, connecting rod; 13, push rod; 14, guide protrusion; 15, kit; 16, follower rod; 17, pulley; 18, assembly plate; 19, first pipe fitting; 20, second pipe fitting; 21, guide column; 22, second cylindrical spring; 23, driven plate; 2301, flat surface; 2302, inclined surface; 24, locking rod; 25, lug. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0042] See also Figure 1-Figure 10 In the embodiment of the present invention, a semi-automatic oil sampler for water testing based on quantitative extraction includes a cylinder 1 and a piston 4 sealingly and slidably disposed in the cylinder 1;

[0043] Also includes:

[0044] A push-pull mechanism is disposed in the cylinder 1 and connected to the piston 4, and the push-pull mechanism can drive the piston 4 to move in the cylinder 1 along the axial direction of the cylinder 1, so as to extract the sample oil into the cylinder 1 or discharge the sample oil from the cylinder 1 through the telescopic tube structure disposed at the end of the cylinder 1;

[0045] A protective shell 3 is movably provided with two protective shells 3 at the end of the cylinder 1. When the two protective shells 3 are butt-jointed, a protective chamber can be formed, and the telescopic tube structure is located in the protective chamber. The two protective shells 3 are each connected with a group of pulling mechanisms, and the pulling mechanisms are used to drive the protective shells 3 to move along the radial direction of the cylinder 1, so that the two protective shells 3 can perform an opening and closing action;

[0046] The locking mechanism is connected to the push-pull mechanism and is used to lock the position of the piston 4 , and whenever the locking mechanism locks or unlocks the piston 4 , the pulling mechanism is triggered.

[0047] Specifically, before use, the two protective shells 3 are in a closed state, at which time, the two form a protective chamber that can isolate the telescopic tube structure from the outside world, and shield the telescopic tube structure to prevent the sample oil from dripping during the transfer process after the sampling is completed, thereby preventing the oil from being contaminated;

[0048] When sampling, the staff first controls the locking mechanism to release the position locking state of the piston 4. During this process, the pulling mechanism is triggered to drive the protective shell 3 to move along the radial direction of the cylinder 1, and the two protective shells 3 are opened, and then the telescopic tube structure performs an extension action;

[0049] Then, the piston 4 is driven by the push-pull mechanism to slide in the cylinder 1 along the axial direction of the cylinder 1 away from the protective shell 3, so that the sample oil can be extracted into the cylinder 1 through the telescopic tube structure. After quantitative extraction, the locking mechanism is controlled to lock the position of the piston 4, and the pulling mechanism is triggered again, so that the two protective shells 3 are retracted, and the telescopic tube structure performs a contraction action, and the protective chamber is formed again to shield the telescopic tube structure.

[0050] Please refer again Figure 7 and Figure 8 Two guide protrusions 14 are fixed on the outer wall of the cylinder 1, and a sleeve 15 is slidably sleeved on the guide protrusion 14. The sleeve 15 is fixedly connected to the protective shell 3. The sleeve 15 is connected to the pulling mechanism. A pulley 17 is also installed on the inner wall of the protective shell 3. The pulley 17 cooperates with the telescopic tube structure and can prompt the telescopic tube structure to perform a telescopic action.

[0051] The telescopic tube structure includes a first tube 19 fixed to the end of the cylinder 1 and connected to the cylinder 1, and a second tube 20 sealingly and slidingly sleeved with the first tube 19, and the second tube 20 is connected with two sets of elastic connection components. Among them, a driven plate 23 is fixed on the outer wall of the second tube 20, and a connected flat surface 2301 and an inclined surface 2302 are formed on the driven plate 23. When the two protective shells 3 are in a closed state, the pulley 17 abuts against the flat surface 2301, and when the two protective shells 3 are in an open state, the pulley 17 abuts against the inclined surface 2302. The elastic connection component includes a guide column 21 fixed to the end of the cylinder 1 and a second cylindrical spring 22 sleeved on the outer periphery of the guide column 21. The guide column 21 passes through the lug 25 fixed on the outer wall of the second tube 20 and is slidably connected with the lug 25.

[0052] See also Figure 5 , the two protective shells 3 are in an open state, and when the pulling mechanism is triggered to drive the kit 15 to slide away from the cylinder 1 on the guide protrusion 14, the two protective shells 3 are opened away from each other, and accordingly, after the pulley 17 is separated from the flat surface 2301, the second cylindrical spring 22 in a compressed state will rebound, so the second pipe 20 can be extended toward the outside of the protective chamber, so that the second pipe 20 is placed in the oil product for oil sampling;

[0053] After the sample oil is extracted, when the position of the piston 4 is locked by the locking mechanism, the pulling mechanism is triggered again, driving the kit 15 to slide on the guide protrusion 14 toward the cylinder 1, and the two protective shells 3 are gradually closed. In the previous stroke of this process, the pulley 17 applies pressure to the inclined surface 2302, causing the driven plate 23 to give way. Specifically, the driven plate 23 drives the second tube 20 to slide on the first tube 19 toward the cylinder 1, and the second cylindrical spring 22 is compressed until the second tube 20 shrinks into the protective shell 3. After the pulley 17 is disengaged from the inclined surface 2302 and abuts against the straight surface 2301, the two protective shells 3 complete the closing process, shielding the second tube 20 to avoid oil contamination caused by the oil adhering to the second tube 20.

[0054] Please refer again Figure 6 and Fig. 9, a mounting plate 18 is fixed inside the cylinder 1, and the push-pull mechanism includes a rotating tube 6 rotatably mounted on the mounting plate 18 and a push-pull rod 5 slidably fitted with the rotating tube 6, and one end of the push-pull rod 5 is fixed to the piston 4. Among them, a round table 8 is fixedly provided at one end of the rotating tube 6 facing the piston 4, and a first cylindrical spring 7 is sleeved on the outer circumference of the push-pull rod 5, and the two ends of the first cylindrical spring 7 are respectively connected to the piston 4 and the round table 8.

[0055] Two strip-shaped protrusions 501 are fixedly provided on the outer wall of the push-pull rod 5, and two strip-shaped grooves 601 are provided on the inner wall of the rotating tube 6, and the strip-shaped grooves 601 are adapted to the strip-shaped protrusions 501, and the two are parallel to the central axis of the push-pull rod 5 and the rotating tube 6, and the rotating tube 6 is connected to the pulling mechanism. The locking mechanism includes a locking rod 24 fixed to the push-pull rod 5, and a locking groove adapted to the locking rod 24 is provided on the outer wall of the cylinder 1, and one end of the locking rod 24 away from the push-pull rod 5 extends into the locking groove and is slidably connected to the cylinder 1, and the locking groove includes a first arc groove 101, a straight groove 102 and a second arc groove 103 connected to each other, and the straight groove 102 is arranged along the axial direction of the cylinder 1, and the lengths of the first arc groove 101 and the second arc groove 103 are equal.

[0056] Before use, the staff needs to first rotate the push-pull rod 5 until the locking rod 24 deflects from the first arc groove 101 to the straight groove 102. During this process, the push-pull rod 5 can drive the rotating tube 6 to rotate through the strip protrusion 501 and the strip groove 601. Correspondingly, the rotating tube 6 drives the pulling mechanism to move, so that the pulling mechanism drives the protective shell 3 to move away from the center of the cylinder 1, and the two protective shells 3 are opened;

[0057] Subsequently, the piston 4 is pulled by the push-pull rod 5 to slide in the cylinder 1 away from the protective shell 3, and the first columnar spring 7 is compressed, so that the sample oil is extracted into the cylinder 1 through the second tube 20 and the first tube 19. When the end of the locking rod 24 away from the push-pull rod 5 moves to the connection between the straight groove 102 and the second arc groove 103, the piston 4 reaches the end of the stroke to realize the quantitative sampling function. Then, the staff rotates the push-pull rod 5 again, so that the end of the locking rod 24 away from the push-pull rod 5 is deflected to the end of the second arc groove 103 away from the straight groove 102. Accordingly, the rotating tube 6 drives the pulling mechanism to move again, so that the two protective shells 3 move closer to each other, the second tube 20 retracts into the protective shell 3, and the two protective shells 3 are closed.

[0058] Please refer again Figure 5 and Fig.10 A shell 2 is also fixed on the outer wall of the cylinder 1, and the pulling mechanism includes a disc 11 rotatably mounted in the shell 2 and a connecting rod 12 with one end rotatably connected to the eccentric part of the disc 11, and the end of the connecting rod 12 away from the disc 11 is connected to the set 15 through a follower structure; a second bevel gear 10 is also fixedly mounted on the rotating shaft of the disc 11, and a first bevel gear 9 is fixedly mounted on the rotating tube 6, and the first bevel gear 9 is meshed with the second bevel gear 10. The follower structure includes a push rod 13 slidably arranged on the side of the shell 2, and the end of the connecting rod 12 away from the disc 11 is rotatably connected to the push rod 13, and the end of the push rod 13 away from the connecting rod 12 is connected to the set 15 through a follower rod 16, and the two ends of the follower rod 16 are rotatably connected to the set 15 and the push rod 13, respectively.

[0059] Whenever the locking rod 24 performs a locking action or an unlocking action, that is, when the locking rod 24 deflects along the first arc groove 101 or the second arc groove 103, the rotating tube 6 can drive the second bevel gear 10 and the disc 11 to complete a half-circle rotation through the first bevel gear 9, and then the disc 11 drives the push rod 13 to slide toward the outside or inside of the housing 2 through the connecting rod 12;

[0060] Specifically, when the push rod 13 slides toward the outside of the shell 2, the follower rod 16 will push the kit 15 to slide on the guide protrusion 14 away from the cylinder 1, and the two protective shells 3 will perform an opening action. On the contrary, when the push rod 13 slides toward the inside of the shell 2, the follower rod 16 will pull the kit 15 to slide on the guide protrusion 14 toward the cylinder 1, and the two protective shells 3 will perform a closing action.

[0061] As another embodiment of the present invention, a method for quantitative extraction of oil products is also proposed, using the semi-automatic oil product water testing sampler based on quantitative extraction, comprising the following steps:

[0062] Step 1: Control the locking mechanism to release the position locking state of the piston 4, so that the pulling mechanism is triggered, driving the protective shell 3 to move along the radial direction of the cylinder 1, the two protective shells 3 are opened, and the telescopic tube structure performs an extension action;

[0063] Step 2: The piston 4 is driven by the push-pull mechanism to slide in the cylinder 1 along the axial direction of the cylinder 1 away from the protective shell 3, and the locking mechanism controls the stroke of the piston 4 to be fixed, so that the sample oil is quantitatively extracted into the cylinder 1 through the telescopic tube structure;

[0064] Step three, control the locking mechanism to lock the position of the piston 4, and trigger the pulling mechanism again, so that the two protective shells 3 are retracted.

[0065] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0066] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A semi-automatic oil sampler for water testing based on quantitative extraction, comprising a cylinder (1) and a piston (4) sealingly and slidably arranged in the cylinder (1); It is characterized in that Also includes: A push-pull mechanism is arranged in the cylinder (1) and connected to the piston (4), and the push-pull mechanism can drive the piston (4) to move in the cylinder (1) along the axial direction of the cylinder (1), so as to draw the sample oil into the cylinder (1) or discharge the sample oil from the cylinder (1) through the telescopic tube structure arranged at the end of the cylinder (1); Two protective shells (3) are movably provided at the ends of the cylinder (1); when the two protective shells (3) are butt-jointed, a protective chamber can be formed; the telescopic tube structure is located in the protective chamber; and the two protective shells (3) are each connected to a group of pulling mechanisms, the pulling mechanisms being used to drive the protective shells (3) to move radially along the cylinder (1) so that the two protective shells (3) can perform an opening and closing action; A locking mechanism is connected to the push-pull mechanism and is used to lock the position of the piston (4), and whenever the locking mechanism locks or unlocks the piston (4), the pulling mechanism is triggered.

2. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 1 is characterized in that: Two guide protrusions (14) are fixed on the outer wall of the cylinder (1), and a sleeve (15) is slidably sleeved on the guide protrusion (14). The sleeve (15) is fixedly connected to the protective shell (3), and the sleeve (15) is connected to the pulling mechanism. A pulley (17) is also installed on the inner wall of the protective shell (3), and the pulley (17) cooperates with the telescopic tube structure and can cause the telescopic tube structure to perform a telescopic action.

3. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 2 is characterized in that: The telescopic tube structure comprises a first tube member (19) fixed to the end of the cylinder (1) and connected to the cylinder (1), and a second tube member (20) sealingly and slidably fitted with the first tube member (19), wherein the second tube member (20) is connected to two sets of elastic connection components; A driven plate (23) is fixed on the outer wall of the second tube (20), and a connected straight surface (2301) and an inclined surface (2302) are formed on the driven plate (23); when the two protective shells (3) are in a closed state, the pulley (17) abuts against the straight surface (2301); when the two protective shells (3) are in an open state, the pulley (17) abuts against the inclined surface (2302).

4. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 3 is characterized in that: The elastic connection assembly comprises a guide column (21) fixed to the end of the cylinder (1) and a second cylindrical spring (22) sleeved on the outer circumference of the guide column (21); the guide column (21) passes through a lug (25) fixed on the outer wall of the second pipe (20) and is slidably connected to the lug (25).

5. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 3 is characterized in that: An assembly plate (18) is fixed inside the cylinder (1), and the push-pull mechanism comprises a rotating tube (6) rotatably mounted on the assembly plate (18) and a push-pull rod (5) slidably fitted with the rotating tube (6), and one end of the push-pull rod (5) is fixed to the piston (4); A truncated platform (8) is fixedly provided at one end of the rotating tube (6) facing the piston (4), and a first cylindrical spring (7) is sleeved on the outer periphery of the push-pull rod (5), and the two ends of the first cylindrical spring (7) are respectively connected to the piston (4) and the truncated platform (8).

6. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 5 is characterized in that: Two strip-shaped protrusions (501) are fixedly provided on the outer wall of the push-pull rod (5), and two strip-shaped grooves (601) are provided on the inner wall of the rotating tube (6). The strip-shaped grooves (601) are adapted to the strip-shaped protrusions (501), and the two are parallel to the central axis of the push-pull rod (5) and the rotating tube (6). The rotating tube (6) is connected to the pulling mechanism.

7. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 6 is characterized in that: The locking mechanism comprises a locking rod (24) fixed on the push-pull rod (5); a locking groove adapted to the locking rod (24) is provided on the outer wall of the cylinder (1); one end of the locking rod (24) away from the push-pull rod (5) extends into the locking groove and is slidably connected to the cylinder (1); the locking groove comprises a first arc groove (101), a straight groove (102) and a second arc groove (103) connected to each other; the straight groove (102) is arranged along the axial direction of the cylinder (1); the first arc groove (101) and the second arc groove (103) are of equal length.

8. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 7 is characterized in that: A shell (2) is also fixed on the outer wall of the cylinder (1), and the pulling mechanism comprises a disc (11) rotatably mounted in the shell (2) and a connecting rod (12) one end of which is rotatably connected to an eccentric portion of the disc (11), and one end of the connecting rod (12) away from the disc (11) is connected to the kit (15) via a follower structure; A second bevel gear (10) is fixedly mounted on the rotating shaft of the disc (11), a first bevel gear (9) is fixedly mounted on the rotating tube (6), and the first bevel gear (9) is meshed with the second bevel gear (10).

9. The semi-automatic oil product water testing sampler based on quantitative extraction according to claim 8, characterized in that: The follower structure comprises a push rod (13) slidably arranged on the side of the shell (2); one end of the connecting rod (12) away from the disc (11) is rotationally connected to the push rod (13); one end of the push rod (13) away from the connecting rod (12) is connected to the kit (15) through a follower rod (16), and two ends of the follower rod (16) are rotationally connected to the kit (15) and the push rod (13) respectively.

10. A method for quantitative extraction of oil products, using the semi-automatic oil product water testing sampler based on quantitative extraction as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Control the locking mechanism to release the position locking state of the piston (4), so that the pulling mechanism is triggered, driving the protective shell (3) to move along the radial direction of the cylinder (1), the two protective shells (3) are opened, and the telescopic tube structure performs an extension action; Step 2: The piston (4) is driven by the push-pull mechanism to slide in the cylinder (1) along the axial direction of the cylinder (1) away from the protective shell (3), and the locking mechanism controls the stroke of the piston (4) to be fixed, so that the sample oil is quantitatively extracted into the cylinder (1) through the telescopic tube structure; Step three, controlling the locking mechanism to lock the position of the piston (4), and triggering the pulling mechanism again, so that the two protective shells (3) are retracted.

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