CN115452483B

CN115452483B - Sampling device and sampling method for petroleum detection

Info

Publication number: CN115452483B
Application number: CN202211416973.4A
Authority: CN
Inventors: 周绵玲
Original assignee: Shengli Oilfield Shengxin Antisepsis Co ltd
Current assignee: Shengli Oilfield Shengxin Antisepsis Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-01-10
Anticipated expiration: 2042-11-14
Also published as: CN115452483A

Abstract

The invention belongs to the technical field of petroleum sampling, and particularly relates to a sampling device and a sampling method for petroleum detection, which comprise a connecting assembly, wherein the connecting assembly comprises a sealing cover, the bottom of the sealing cover is provided with a threaded connecting port, the top of the sealing cover is provided with a sampling cylinder, and a connecting block is fixedly connected between the bottom of the sampling cylinder and the top of the sealing cover; before sampling petroleum, the bottom openings of the sampling pipes can be positioned at different heights by adjusting the plurality of screw rods, so that sampling requirements of different liquid levels are met, when the petroleum is sampled, the connecting cylinders can be driven by the motor to be sequentially communicated with different sampling chambers, so that the petroleum sampling operation of different liquid levels is completed under the action of the sampling pump, and compared with the existing sampling operation, the manual sampling time is saved, and the sampling efficiency is improved.

Description

Sampling device and sampling method for petroleum detection

Technical Field

The invention belongs to the technical field of petroleum sampling, and particularly relates to a sampling device and a sampling method for petroleum detection.

Background

The petroleum is a viscous and dark brown liquid called as 'industrial blood', the upper part of the crust has petroleum storage, the main component is a mixture of various alkanes, cyclanes and aromatics, and the petroleum storage is one of the main objects of geological exploration, and a sampling device is usually used for sampling the petroleum in the tank during the petroleum detection process.

In the process of oil storage, because the condition that impurity deposit and suspension can appear in the oil tank to cause the oil quality of different liquid levels to be inconsistent, in order to confirm the oil quality of different liquid levels, need carry out the layering sample to the oil in the holding vessel. The existing petroleum sampling mode mainly utilizes a sampling pipe to take out petroleum at different liquid levels in a grading way, and although the mode can also finish the layering sampling operation of the petroleum, the method has the following defects:

1. during sampling, because the suction pipe needs to be manually used for sampling petroleum with different liquid levels for multiple times, the sampling efficiency is low;

2. during sampling, the suction pipe is inserted into the petroleum from top to bottom, so that when petroleum with different liquid levels is sucked, the petroleum on the top layer can enter the suction pipe, and the sampling detection result can be influenced;

3. because the time of oil storage is longer, and along with the extension of oil storage time, the oil quality of different liquid levels also can change, consequently need regularly to carry out sample detection to oil, but because the sample detection mode of current utilizes the straw sample of manual work, consequently to the sample detection of same liquid level, probably has the deviation because of the change of the sample depth to influence the testing result.

Therefore, it is necessary to provide a sampling device and a sampling method for oil detection to solve the above problems.

Disclosure of Invention

In view of the above problems, the present invention provides a sampling device and a sampling method for oil detection, so as to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a sampling device for oil detection, includes coupling assembling, coupling assembling includes sealed lid, and the bottom of sealed lid is equipped with threaded connection mouth, the top of sealed lid is equipped with the sampler barrel, fixedly connected with connecting block between the bottom of sampler barrel and the top of sealed lid, the annular is provided with a plurality of sampling rooms in the sampler barrel, and is equipped with the baffle between two adjacent sampling rooms, the bottom inner wall fixed connection of baffle and sampler barrel is a plurality of the top level of baffle is provided with same circular shape closing plate, the edge of closing plate rotates and installs on the inner wall of sampler barrel, the annular bounding wall of top fixedly connected with of sampler barrel, the bottom of sampler barrel is connected with a plurality of sampling tubes, and is a plurality of the distribution that the sampling tube corresponds is in the bottom of a plurality of sampling rooms, and sampling tube and sampling chamber intercommunication, the bottom of sampling tube runs through pegging graft on sealed lid, coupling assembling's bottom is provided with sampling device, still include auto-change over device, and the auto-over device is located coupling assembling's top setting.

Furthermore, the number of the sampling devices is the same as that of the sampling tubes, the sampling devices are respectively located at the positive bottoms of the sampling chambers, each sampling device comprises a screw rod, the screw rods vertically slide to penetrate through and are inserted into the sealing covers, the tops of the screw rods are rotatably connected with the bottoms of the sampling tubes, movable rings are sleeved on partial threads of the screw rods located at the bottoms of the sealing covers, connecting plates are connected between the movable rings and the sampling tubes in corresponding positions, limiting rods are slidably inserted into the tops of the connecting plates, and the tops of the limiting rods are vertically and fixedly connected with the bottoms of the sealing covers.

Further, the switching device comprises a rotating shaft, the rotating shaft is vertically fixed to penetrate through the center of the top of the sealing plate in a penetrating mode, the bottom of the rotating shaft is connected with the inner wall of the bottom of the sampling cylinder in a rotating mode, the U-shaped plate is connected with the top of the enclosing plate in a rotating mode, the top of the rotating shaft is connected with a motor, the top of the sealing plate is fixedly connected with the connecting cylinder, the inside of the connecting cylinder is communicated with the bottom space of the sealing plate, an oil outlet pipe is connected onto the side wall of the connecting cylinder, a sampling pump is installed on the oil outlet pipe, a quick connector is installed at the end of the oil outlet pipe, a piston plate is arranged inside the connecting cylinder, a straight rod is fixedly connected with the top of the piston plate in a sliding mode, the straight rod penetrates through the top of the connecting cylinder in a penetrating mode, a spring is sleeved on the portion, located inside the connecting cylinder, of the straight rod, a roller is horizontally and perpendicular to the inner wall of the enclosing plate, an annular supporting plate is arranged on the bottom level of the roller, the supporting plate is fixedly connected with a plurality of top blocks, and the top blocks are located at the tops of a plurality of the sampling chambers respectively, and the top blocks are gradually reduced in the height direction towards the middle of the top of the sampling chambers.

Further, the leak protection cover has been cup jointed to the outside of sampling tube, be connected with the back flow between the side of leak protection cover and the closing plate, the both ends of back flow communicate with the inside of leak protection cover and the bottom of closing plate respectively, and the tie point of back flow and closing plate and the tie point of connecting cylinder and closing plate are located the same diameter of closing plate, install the valve on the back flow.

Furthermore, the bottom of sampling tube is connected with filters the stopper, and filters stopper and connecting plate fixed connection.

Furthermore, the top of the partition board is fixedly connected with a sealing strip, and the sealing strip is tightly attached to the bottom of the sealing plate.

Furthermore, the outside of roller bearing rotates to be cup jointed with the axle sleeve, and the length of axle sleeve is the same with the thickness of kicking block.

Further, the sampling tube is a rubber hose, and the length of the sampling tube is the same as that of the screw rod.

The invention also discloses a sampling method for petroleum detection, which is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: before petroleum sampling is carried out, a plurality of sampling devices are sequentially adjusted, a screw rod is rotated, so that a movable ring can move up and down along the screw rod under the matching action of the screw rod and a limiting rod, the position of the movable ring is adjusted, the movable ring can drive a filter plug at the bottom of a sampling tube to move together with the change of the position of the movable ring, when an opening at the bottom of the sampling tube is adjusted to a proper position, the screw rod stops rotating, and at the moment, the opening at the bottom of the sampling tube is fixed at a specified liquid level height;

step two: opening the oil tank, inserting a plurality of sampling devices communicated with the sampling pipes into the oil tank from a sampling port of the oil tank, screwing a sealing cover and the sampling port together, and connecting a container for sampling with a switching device;

step three: then starting a motor of the switching device, enabling the sealing plate to drive a rotating shaft of the connecting cylinder to rotate as a circle center under the action of the rotating shaft, meanwhile, along with the rotation of the connecting cylinder, the rolling shaft moves along the top of the supporting plate under the drive of the connecting cylinder, when the rolling shaft moves to the highest point of the top block, stopping the motor, enabling the oil outlet pipe to be communicated with the corresponding sampling chamber through the connecting cylinder, then connecting a sampling container for sampling with the oil outlet pipe through a quick connector, then starting a sampling pump, enabling oil in the oil tank to enter the sampling chamber through the corresponding sampling pipe, and enabling the oil in the sampling chamber to enter the sampling container through the oil outlet pipe, thereby completing the first sampling operation of the oil;

step four: and then, according to the operations, the petroleum sampling operation of different liquid levels is completed in sequence, and the taken petroleum sample is sent to a detection center for detection.

The invention has the technical effects and advantages that:

1. before sampling petroleum, the bottom openings of the sampling pipes can be positioned at different heights by adjusting the plurality of screw rods, so that sampling requirements of different liquid levels are met, when the petroleum is sampled, the connecting cylinders can be driven by the motor to be sequentially communicated with different sampling chambers, so that the sampling operation of the petroleum at different liquid levels is completed under the action of the sampling pump, and compared with the existing sampling operation, the manual sampling time is saved, and the sampling efficiency is improved;

2. during sampling for the second time, when the sealing plate drives the connecting cylinder to move towards the top of the next sampling chamber under the action of the motor, the roller can gradually move downwards along the top of the first ejector block under the drive of the connecting cylinder, and along with the downward movement of the roller, the piston plate can move downwards under the action of the spring, so that the petroleum remained in the connecting cylinder is pressed back into the first sampling chamber, and the sealing strip can scrape the bottom of the sealing plate, so that the petroleum in the previous sampling chamber is prevented from entering the next sampling chamber, the petroleum in the first sampling chamber is prevented from influencing the next petroleum collection sample, and the detection accuracy is further ensured;

3. when with sampling vessel and quick-operation joint disconnection, the part is remained the oil on the quick-operation joint and can be flowed down along the surface of quick-operation joint under the effect of gravity, at this moment, because the existence of leak protection cover, consequently, remain and can be collected by the leak protection cover to the oil that gets on the quick-operation joint, after the sample finishes, can open the valve on the back flow, thereby make the oil in the leak protection cover flow into the sample chamber through the back flow, and finally get back to in the oil tank through the sample pipe flow of sample chamber bottom, thereby avoid the waste of oil.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a first perspective view of the present invention;

FIG. 2 is a second perspective view of the present invention;

FIG. 3 is a schematic perspective view of a sampling tube and a part of a switching device according to the present invention;

FIG. 4 is a partial perspective view of the invention shown in FIG. 3;

fig. 5 is a schematic perspective view of the sampling tube, the partition plate and the sealing strip according to the present invention.

In the figure: 1. a sealing cover; 2. a sampling tube; 3. connecting blocks; 4. a partition plate; 5. a sealing plate; 6. enclosing plates; 7. a sampling tube; 8. a sampling device; 81. a screw; 82. a movable ring; 83. a connecting plate; 84. a limiting rod; 9. a switching device; 901. a rotating shaft; 902. a U-shaped plate; 903. a motor; 904. a connecting cylinder; 905. an oil outlet pipe; 906. a sampling pump; 907. a quick connector; 908. a piston plate; 909. a straight rod; 910. a spring; 911. a roller; 912. a support plate; 913. a top block; 10. a leakage-proof cover; 11. a return pipe; 12. a valve; 13. a filter plug; 14. a seal strip; 15. and a shaft sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

the invention provides a sampling device for petroleum detection as shown in figures 1-5, which comprises a connecting assembly, wherein the connecting assembly comprises a sealing cover 1, the bottom of the sealing cover 1 is provided with a threaded connector, the top of the sealing cover 1 is provided with a sampling tube 2, a connecting block 3 is fixedly connected between the bottom of the sampling tube 2 and the top of the sealing cover 1, a plurality of sampling chambers are annularly arranged in the sampling tube 2, a partition plate 4 is arranged between two adjacent sampling chambers, the partition plate 4 is fixedly connected with the inner wall of the bottom of the sampling tube 2, the tops of the partition plates 4 are horizontally provided with a same circular sealing plate 5, the edge of the sealing plate 5 is rotatably arranged on the inner wall of the sampling tube 2, the top of the sampling tube 2 is fixedly connected with an annular surrounding plate 6, the bottom of the sampling tube 2 is connected with a plurality of sampling tubes 7, the plurality of sampling tubes 7 are correspondingly distributed at the bottoms of the sampling chambers, the sampling tubes 7 are communicated with the sampling chambers, the bottom ends of the sampling tubes 7 are inserted in the sealing cover 1, the top of the partition plate 4 is fixedly connected with a sealing strip 14, the bottoms of the sealing plate 5 are tightly attached to the sealing plate 7, the sealing plate 81, the length of the sampling tube 7 is the same as that of the screw rod of the rubber switching connecting assembly, and the sampling tube is arranged on the screw rod of the screw rod, and the screw rod of the screw rod for switching device;

before petroleum sampling is carried out, sequentially adjusting a plurality of sampling devices 8 so that the bottoms of a plurality of sampling pipes 7 can be positioned at different heights at the bottom of a sealing cover 1 under the action of the corresponding sampling devices 8, then opening a sampling port of an oil tank, then connecting the plurality of sampling devices 8 with the sampling pipes 7 and inserting the sampling pipes into the oil tank from the sampling port of the oil tank, and finally screwing the sealing cover 1 and the sampling port together;

when sampling petroleum, firstly connecting a container for sampling with a switching device 9, and then starting the switching device 9, so that the petroleum at a corresponding liquid level in an oil tank can enter a corresponding sampling chamber through a sampling pipe 7, and then the petroleum entering the sampling chamber can enter the sampling container under the action of the switching device 9, thereby completing the petroleum sampling operation at the corresponding liquid level, after the first sampling is completed, taking down the sampling container filled with the petroleum and replacing with a new sampling container, and then enabling the switching device 9 to drive a sealing plate 5 to rotate and move to the top of the next sampling chamber, and in the rotating process of the sealing plate 5, as the top of the partition plate 4 is connected with a sealing strip 14, the sealing strip 14 can scrape the bottom of the sealing plate 5 along with the rotation of the sealing plate 5, thereby preventing the petroleum in the previous sampling chamber from entering the next sampling chamber, and further ensuring that petroleum samples at different liquid levels cannot interfere with each other;

accomplish in proper order according to above-mentioned operation after that and to the oil sampling operation of different liquid levels can, for current sampling operation, the time of artifical sample has been saved, the sampling efficiency is improved, in addition, after the sample finishes, can remain the sample connection module in the sample connection position of oil tank, thereby be convenient for next sampling operation, can also guarantee next time when taking a sample to the oil of different liquid levels simultaneously, the height of the sample of different liquid levels is the same with the sample height last time, avoid influencing the testing result because the change of sampling depth.

As shown in fig. 1 and 2, the bottom of the connection assembly is provided with sampling devices 8, the number of the sampling devices 8 is the same as that of the sampling tubes 7, and the sampling devices 8 are respectively located at the positive bottoms of the sampling chambers, the sampling devices 8 include screws 81, the screws 81 are vertically slidably inserted into the sealing cover 1, the top of the screws 81 is rotatably connected with the bottom of the sampling tube 2, a movable ring 82 is sleeved on a part of the screws 81 located at the bottom of the sealing cover 1, a connecting plate 83 is connected between the movable ring 82 and the sampling tube 7 at the corresponding position, a limiting rod 84 is slidably inserted into the top of the connecting plate 83, the top of the limiting rod 84 is vertically and fixedly connected with the bottom of the sealing cover 1, the bottom of the sampling tube 7 is connected with a filter plug 13, and the filter plug 13 is fixedly connected with the connecting plate 83;

before petroleum sampling is carried out, the screw rod 81 can be rotated, so that the movable ring 82 can move up and down along the screw rod 81 under the matching action of the screw rod 81 and the limiting rod 84, the position of the movable ring 82 is adjusted, along with the change of the position of the movable ring 82, the movable ring 82 can drive the filter plug 13 at the bottom of the sampling tube 7 to move together through the connecting plate 83, after the bottom opening of the sampling tube 7 is adjusted to a proper position, the screw rod 81 stops rotating, at the moment, the bottom opening of the sampling tube 7 is fixed at a specified liquid level height, and then the rest sampling tubes 7 are sequentially adjusted according to the operation, so that the sampling requirements of petroleum with different liquid levels can be met;

in addition, because the bottom of sampling tube 7 is equipped with filters stopper 13, at the in-process of sample, filters stopper 13 and can carry out the prefilter to the oil to avoid the large granule impurity in the oil to enter into sampler barrel 2, and then avoid the sampling chamber to be blockked up by impurity.

As shown in fig. 1-4, the connection assembly further includes a switching device 9, and the switching device 9 is located at the top of the connection assembly, the switching device 9 includes a rotating shaft 901, the rotating shaft 901 is vertically fixed to penetrate through and inserted in the center of the top of the sealing plate 5, the bottom of the rotating shaft 901 is rotatably connected to the inner wall of the bottom of the sampling cylinder 2, a U-shaped plate 902 is rotatably sleeved on the rotating shaft 901, the U-shaped plate 902 is fixedly connected to the top of the surrounding plate 6, the top of the rotating shaft 901 is connected to a motor 903, the top of the sealing plate 5 is fixedly connected to a connecting cylinder 904, the inside of the connecting cylinder 904 is communicated with the bottom space of the sealing plate 5, an oil outlet pipe 905 is connected to the side wall of the connecting cylinder 904, a sampling pump 906 is installed on the oil outlet pipe 905, a quick connector 907 is installed at the end of the oil outlet pipe 905, a piston plate 908 is installed inside the connecting cylinder 904, the top of the piston plate 908 is vertically and fixedly connected with a straight rod 909, the top of the straight rod 909 penetrates through the top of the connecting cylinder 904 in a sliding mode and is inserted into the connecting cylinder 904, a spring 910 is sleeved on a part of the straight rod 909, which is located inside the connecting cylinder 904, the top of the straight rod 909 is horizontally and fixedly connected with a roller 911, the roller 911 is perpendicular to the inner wall of the enclosing plate 6, an annular supporting plate 912 is horizontally arranged at the bottom of the roller 911, the supporting plate 912 is fixedly connected with the inner wall of the enclosing plate 6, a plurality of top blocks 913 are fixedly connected to the top of the supporting plate 912, the top blocks 913 are located at the tops of the sampling chambers respectively, the heights of the top blocks 913 are gradually reduced towards the direction far away from the middle of the top blocks 913, a shaft sleeve 15 is rotatably sleeved outside the roller 911, and the length of the shaft sleeve 15 is the same as the thickness of the top blocks 913;

during sampling, the motor 903 is started first, so that the sealing plate 5 drives the connecting cylinder 904 to rotate around a rotating shaft 901 under the action of the rotating shaft 901, meanwhile, with the rotation of the connecting cylinder 904, the roller 911 moves along the top of the supporting plate 912 under the drive of the connecting cylinder 904, when the roller 911 contacts with the top block 913, with the continuous rotation of the sealing plate 5, the shaft sleeve 15 outside the roller 911 gradually rolls upwards along the top of the top block 913, and with the upward movement of the roller 911, the straight rod 909 can push the roller 911 downwards to move the piston plate 908 under the pushing action of the top block 913, so that the spring 910 is gradually compressed under the extrusion of the piston plate 908, when the roller 911 moves to the highest point of the top block 913, the motor 903 is stopped, at the moment, the oil outlet pipe 905 can be communicated with the corresponding sampling chamber through the connecting cylinder 904, then a sampling container for sampling is connected with the oil outlet pipe 905 through the quick connector 907, then the sampling pump 906 is started, so that oil in the sampling oil tank can enter the corresponding sampling chamber through the oil outlet pipe 905, and then the sampling container can enter the sampling chamber, thereby completing the first sampling operation;

after the first sampling is finished, disconnecting the sampling container filled with the petroleum sample from the quick connector 907, then continuing to start the motor 903, so that the sealing plate 5 drives the connecting cylinder 904 to move towards the top of the next sampling chamber under the action of the motor 903, in the process, the roller 911 can gradually move downwards along the top of the first top block 913 under the drive of the connecting cylinder 904, and along with the downward movement of the roller 911, the piston plate 908 can move downwards under the action of the spring 910, so that the petroleum remained in the connecting cylinder 904 is pressed back into the first sampling chamber, the petroleum remained in the first sampling chamber in the connecting cylinder 904 is prevented from influencing the next petroleum sampling sample, and the detection accuracy is further ensured;

after roller 911 removed from the top of first kicking block 913 completely, sample one by one according to the first sampling operation to every sampling chamber, can accomplish the sampling operation to different liquid level petroleum, for current sampling operation, saved the time of artifical sample, improved sampling efficiency.

As shown in fig. 3 and 4, a leakage-proof cover 10 is sleeved outside the sampling tube 7, a return tube 11 is connected between the side surface of the leakage-proof cover 10 and the sealing plate 5, two ends of the return tube 11 are respectively communicated with the inside of the leakage-proof cover 10 and the bottom of the sealing plate 5, a connection point of the return tube 11 and the sealing plate 5 and a connection point of the connecting cylinder 904 and the sealing plate 5 are located on the same diameter of the sealing plate 5, and a valve 12 is installed on the return tube 11;

when the sampling container is disconnected from the quick connector 907, part of the petroleum remained on the quick connector 907 flows downwards along the surface of the quick connector 907 under the action of gravity, at the moment, due to the existence of the leakage-proof cover 10, the petroleum remained on the quick connector 907 can be collected by the leakage-proof cover 10, after sampling is finished, the valve 12 on the return pipe 11 can be opened, so that the petroleum in the leakage-proof cover 10 can flow into the sampling chamber through the return pipe 11, and finally flows back into the oil tank through the sampling pipe 7 at the bottom of the sampling chamber, so that the waste of the petroleum is avoided, and finally, after the petroleum in the leakage-proof cover 10 completely flows back into the oil tank, the valve 12 is closed.

Example 2

the method comprises the following steps: before petroleum sampling is carried out, a plurality of sampling devices 8 are sequentially adjusted, the screw rod 81 is rotated, so that the movable ring 82 can move up and down along the screw rod 81 under the matching action of the screw rod 81 and the limiting rod 84, the position of the movable ring 82 is adjusted, along with the change of the position of the movable ring 82, the movable ring 82 can drive the filter plug 13 at the bottom of the sampling tube 7 to move together through the connecting plate 83, after the bottom opening of the sampling tube 7 is adjusted to a proper position, the screw rod 81 stops rotating, and at the moment, the bottom opening of the sampling tube 7 is fixed at a specified liquid level height;

step two: opening the oil tank, inserting a plurality of sampling devices 8 into the oil tank from a sampling port of the oil tank together with a sampling pipe 7, screwing the sealing cover 1 and the sampling port together, and connecting a container for sampling with a switching device 9;

step three: then, the motor 903 of the switching device 9 is started, so that the sealing plate 5 drives the connecting cylinder 904 to rotate around a rotating shaft 901 of the connecting cylinder 904 under the action of the rotating shaft 901, meanwhile, along with the rotation of the connecting cylinder 904, the roller 911 moves along the top of the supporting plate 912 under the drive of the connecting cylinder 904, when the roller 911 moves to the highest point of the top block 913, the motor 903 is stopped, at this time, the oil outlet pipe 905 can be communicated with a corresponding sampling chamber through the connecting cylinder 904, then, a sampling container for sampling is connected with the oil outlet pipe 905 through the quick connector 907, then, the sampling pump 906 is started, so that oil in the oil tank can enter the sampling chamber through the corresponding sampling pipe 7, and then oil in the sampling chamber can enter the sampling container through the oil outlet pipe 905, thereby completing the first sampling operation of the oil;

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a sampling device for oil detection, includes coupling assembling, its characterized in that: the connecting assembly comprises a sealing cover (1), the bottom of the sealing cover (1) is provided with a threaded connecting port, the top of the sealing cover (1) is provided with a sampling cylinder (2), a connecting block (3) is fixedly connected between the bottom of the sampling cylinder (2) and the top of the sealing cover (1), a plurality of sampling chambers are annularly arranged in the sampling cylinder (2), a partition plate (4) is arranged between every two adjacent sampling chambers, the partition plate (4) is fixedly connected with the inner wall of the bottom of the sampling cylinder (2), the tops of the partition plates (4) are horizontally provided with a same circular sealing plate (5), the edge of the sealing plate (5) is rotatably arranged on the inner wall of the sampling cylinder (2), the top of the sampling cylinder (2) is fixedly connected with an annular surrounding plate (6), the bottom of the sampling cylinder (2) is connected with a plurality of sampling tubes (7), the sampling tubes (7) are correspondingly distributed at the bottoms of the sampling chambers and are communicated with the sampling chambers, the bottom ends of the sampling tubes (7) penetrate through the sealing cover (1), the bottom of the connecting assembly is provided with a switching device (8), and the switching device (9) is arranged at the top of the connecting assembly;

the number of the sampling devices (8) is the same as that of the sampling tubes (7), the sampling devices (8) are respectively positioned at the positive bottoms of the sampling chambers, each sampling device (8) comprises a screw rod (81), the screw rods (81) vertically slide and penetrate through and are inserted into the sealing covers (1), the tops of the screw rods (81) are rotatably connected with the bottoms of the sampling cylinders (2), a movable ring (82) is sleeved on a part of the screw rods (81) positioned at the bottoms of the sealing covers (1) in a sliding mode, a connecting plate (83) is connected between each movable ring (82) and the corresponding sampling tube (7), a limiting rod (84) is inserted into the tops of the connecting plates (83) in a sliding mode, and the tops of the limiting rods (84) are vertically and fixedly connected with the bottoms of the sealing covers (1);

the switching device (9) comprises a rotating shaft (901), the rotating shaft (901) is vertically and fixedly inserted at the center of the top of a sealing plate (5) in a penetrating manner, the bottom of the rotating shaft (901) is rotatably connected with the inner wall of the bottom of a sampling cylinder (2), a U-shaped plate (902) is rotatably sleeved on the rotating shaft (901), the U-shaped plate (902) is fixedly connected with the top of a surrounding plate (6), the top of the rotating shaft (901) is connected with a motor (903), the top of the sealing plate (5) is fixedly connected with a connecting cylinder (904), the inside of the connecting cylinder (904) is communicated with the bottom space of the sealing plate (5), an oil outlet pipe (905) is connected onto the side wall of the connecting cylinder (904), a sampling pump (906) is installed on the oil outlet pipe (905), a quick connection (907) is installed at the end of the oil outlet pipe (905), a piston plate (908) is arranged inside the connecting cylinder (904), a straight rod (909) is vertically and fixedly connected with the top of the piston plate (908), the straight rod (909) is slidably inserted at the top of the connecting cylinder (904), the straight rod (911) is positioned inside the connecting cylinder (911), and the straight rod (911) is connected with a horizontal spring (910) which is connected with the vertical and the inner wall of the straight rod (911), an annular supporting plate (912) is horizontally arranged at the bottom of the rolling shaft (911), the supporting plate (912) is fixedly connected with the inner wall of the enclosing plate (6), a plurality of jacking blocks (913) are fixedly connected to the top of the supporting plate (912), the jacking blocks (913) are respectively positioned at the positive tops of the sampling chambers, and the heights of the jacking blocks (913) are gradually reduced towards the direction far away from the middle parts of the jacking blocks (913);

a leakage-proof cover (10) is sleeved outside the sampling tube (7), a return pipe (11) is connected between the side face of the leakage-proof cover (10) and the sealing plate (5), two ends of the return pipe (11) are respectively communicated with the inside of the leakage-proof cover (10) and the bottom of the sealing plate (5), the connecting point of the return pipe (11) and the sealing plate (5) and the connecting point of the connecting cylinder (904) and the sealing plate (5) are located on the same diameter of the sealing plate (5), and a valve (12) is installed on the return pipe (11);

the bottom of the sampling tube (7) is connected with a filter plug (13), and the filter plug (13) is fixedly connected with a connecting plate (83);

the top of baffle (4) fixedly connected with sealing strip (14), and sealing strip (14) and the bottom of closing plate (5) are pasted tightly.

2. The sampling device for petroleum detection according to claim 1, characterized in that: the outer portion of the roller (911) is rotatably sleeved with a shaft sleeve (15), and the length of the shaft sleeve (15) is the same as the thickness of the top block (913).

3. The sampling device for petroleum detection according to claim 1, characterized in that: the sampling tube (7) is a rubber hose, and the length of the sampling tube (7) is the same as that of the screw rod (81).

4. A sampling method for oil testing using the sampling device for oil testing according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:

the method comprises the following steps: before petroleum sampling is carried out, a plurality of sampling devices (8) are sequentially adjusted, a screw rod (81) is rotated, so that a movable ring (82) can move up and down along the screw rod (81) under the matching action of the screw rod (81) and a limiting rod (84), the position of the movable ring (82) is adjusted, along with the change of the position of the movable ring (82), the movable ring (82) can drive a filter plug (13) at the bottom of a sampling tube (7) to move together through a connecting plate (83), after the bottom opening of the sampling tube (7) is adjusted to a proper position, the screw rod (81) stops rotating, and at the moment, the bottom opening of the sampling tube (7) is fixed at a designated liquid level;

step two: opening the oil tank, then inserting a plurality of sampling devices (8) into the oil tank from a sampling port of the oil tank together with a sampling pipe (7), finally screwing a sealing cover (1) and the sampling port together, and connecting a container for sampling with a switching device (9);

step three: then starting a motor (903) of the switching device (9), enabling the sealing plate (5) to drive a rotating shaft (901) of the connecting cylinder (904) to rotate around the center under the action of the rotating shaft (901), meanwhile, along with the rotation of the connecting cylinder (904), the rolling shaft (911) is driven by the connecting cylinder (904) to move along the top of the supporting plate (912), when the rolling shaft (911) moves to the highest point of the top block (913), stopping the motor (903), enabling the oil outlet pipe (905) to be communicated with the corresponding sampling chamber through the connecting cylinder (904), then connecting a sampling container for sampling with the oil outlet pipe (905) through a quick connector (907), then starting a sampling pump (906), enabling oil in the oil tank to enter the sampling chamber through the corresponding sampling pipe (7), and enabling oil in the sampling chamber to enter the sampling container through the oil outlet pipe (905), thereby completing the first sampling operation of the oil;