A tank sampler

Abstract

The present invention relates to a tank bottom sampler applied in the field of sampling technology. Through a servo motor, a winding piece and a connecting rope, an upper sampling tube, a middle sampling tube and a lower sampling tube can be lifted after a single round of sampling, so as to promote the discharge of residual oil therein, and a shaking process can be performed after lifting in a forward and reverse manner, so as to promote the complete discharge of the residual oil, and a hoop ring is driven to move through a small electric extension rod to drive the hoop ring to switch the lifting position points on the surfaces of the upper sampling tube, the middle sampling tube and the lower sampling tube, so as to make up for the incomplete lifting and discharge caused by the excessive length of the upper sampling tube, the middle sampling tube and the lower sampling tube in the oil tank. In addition, through the cooperation of a deformable movable part, a magnetic sliding shaft and a magnetic ring, the inner walls of the upper sampling tube, the middle sampling tube and the lower sampling tube can be scraped when the hoop ring moves, so as to further improve the discharge effect of the residual oil.

Description

Technical Field

[0001] The invention relates to a tank sampler, in particular to a tank sampler applied in the technical field of sampling. Background Art

[0002] Oil tanks are usually used to store fuel. After a long period of storage, the moisture and impurities in the upper layer of fuel are always lower than the bottom oil layer due to the sedimentation of moisture and impurities in the gravity field. Therefore, it is necessary to sample the oil tank regularly to understand the oil quality in the tank. The under-tank sampler is based on the characteristics of the proportional telescopic frame. The position of the sampling point is fixed on the telescopic frame, so that the sampling point will change with the change of the liquid level, thereby ensuring the accuracy of the sampling.

[0003] The specification of Chinese utility model patent CN202320228374.3 discloses a K-type tank sampler, including a tank body, an operating box is arranged on one side of the outside of the tank body, a limit slide rod and a lifting threaded rod are arranged inside the tank body, a connecting plate is arranged on the outside of the limit slide rod and the lifting threaded rod, a mounting sleeve is arranged between the operating box and the tank body, a sampling rod is arranged on the side of the mounting sleeve away from the operating box, the sampling rod and the sampling rope are adopted, and the sampling rope and the sampling rod are movably connected, when the connecting plate moves up and down, an isosceles triangle is formed between the sampling rod and the sampling rope, and the sampling rope at the top is connected to the connecting plate, an operating box is arranged at the bottom of the outside of the tank body, the sampling rod faces the center of the tank, and the whole is K-shaped, according to the geometric principle of the ratio of the side length and height of the isosceles triangle, the position of the sampling point on the sampling rod can always be maintained at the top, middle and bottom positions relative to the liquid level for sampling.

[0004] Existing tank samplers usually use a hand pump to take samples. After sampling, multiple sampling tubes contain residual oil. However, after the hand pump stops working, the residual oil in the sampling tube cannot return to the oil tank on its own. In the next round of sampling, samples with different liquid level heights will be mixed with the residual oil in the previous round, affecting the accuracy of the sampling test results. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that during the sampling process in the oil tank, after a single sampling is completed, the residual oil in multiple sampling tubes can be returned to the interior of the oil tank, thereby avoiding the mixing of liquids with different liquid level heights in the interval between two rounds of sampling operations, thereby ensuring the accuracy of the sampling and detection results.

[0006] In order to solve the above problems, the present invention provides a tank sampler, comprising an oil tank and a telescopic frame installed in the oil tank, a buoy is movably connected to the upper end of the telescopic frame, three supporting shafts are rotatably connected to the surface of the telescopic frame along the height direction, an upper sampling tube, a middle sampling tube and a lower sampling tube are respectively installed inside the three supporting shafts, one end of the upper sampling tube, the middle sampling tube and the lower sampling tube extends to the outside of the oil tank and is connected to a transfer tube, a hand pump is installed on the surface of the oil tank near the top, and the input end of the hand pump is connected to the transfer tube;

[0007] The other ends of the upper sampling tube, the middle sampling tube and the lower sampling tube are all penetrated by a one-way branch pipe with a built-in one-way valve, and the surfaces of the upper sampling tube, the middle sampling tube and the lower sampling tube and each one-way branch pipe are all installed with an electronic valve;

[0008] A servo motor is installed on the top wall of the oil tank, and the output end of the servo motor is connected to a winding piece with an elliptical cross-section. An L-shaped support rod is installed on the top wall of the oil tank, and the support rod is rotatably connected to the surface of the winding piece. The surfaces of the upper sampling tube, the middle sampling tube and the lower sampling tube are all sleeved with hoops, and the adjacent hoops are connected by a winding rope, and the top winding rope is wrapped around the surface of the winding piece.

[0009] In the above-mentioned tank bottom sampler, the upper sampling tube, the middle sampling tube and the lower sampling tube can be lifted after a single round of sampling through the servo motor, the winding piece and the connecting rope to promote the discharge of residual oil inside them, and they can be shaken in a forward and reverse manner after lifting to promote the complete discharge of residual oil.

[0010] As a further improvement of the present application, a connecting rope is connected to the top surface of the telescopic frame, a closing box is installed on the bottom wall of the oil tank, a winding motor is installed inside the closing box, the output end of the winding motor is connected to a rod body, and the surface of the rod body is wrapped around the tail end of the connecting rope.

[0011] As a further improvement of the present application, the installation position of the transfer tube is located above the installation position of the upper sampling tube, and the upper sampling tube, the middle sampling tube and the lower sampling tube are all flexible tubes.

[0012] As a further improvement of the present application, the installation position of the hoops on the surface of the upper sampling tube, the middle sampling tube and the lower sampling tube is close to the inner wall of the oil tank, and the length of the parts of the upper sampling tube, the middle sampling tube and the lower sampling tube located inside the oil tank is greater than the horizontal distance between the inner wall of the oil tank and the supporting shaft rod on the surface of the telescopic frame.

[0013] As another improvement of the present application, a small electric extension rod is installed on the inner top wall of the oil tank, and the power end of the small electric extension rod is connected to the surface of the servo motor, and the support rod is slidably connected to the top wall of the oil tank.

[0014] As another improvement of the present application, the parts of the upper sampling tube, the middle sampling tube and the lower sampling tube located in the oil tank are all installed with deformable movable parts, a one-way channel is installed through the interior of the deformable movable parts, a magnetic sliding shaft is installed through the interior of the deformable movable parts, a magnetic ring is installed on the inner side of the hoop, and the magnetic ring and the magnetic sliding shaft attract each other.

[0015] As another improved supplement of the present application, the deformable movable member is composed of an elastic bag and an electrorheological fluid in the elastic bag, the elastic bag is made of elastic memory material, and the diameter of the elastic bag is the same as the inner diameter of the upper sampling tube, the middle sampling tube and the lower sampling tube.

[0016] As a further improvement of the present application, the length of the magnetic sliding shaft is the same as the inner diameters of the upper sampling tube, the middle sampling tube and the lower sampling tube, and the surface of the magnetic sliding shaft is coated with an insulating coating.

[0017] To summarize, in the present application, the servo motor, the winding member and the connecting rope can be used to lift the upper sampling tube, the middle sampling tube and the lower sampling tube after a single round of sampling to promote the discharge of residual oil therein, and they can be shaken in a forward and reverse manner after lifting to promote the complete discharge of residual oil. The movement of the hoop ring is driven by a small electric extension rod to drive the switching of the lifting position points on the surfaces of the upper sampling tube, the middle sampling tube and the lower sampling tube, which can make up for the incomplete lifting and discharge caused by the excessive length of the upper sampling tube, the middle sampling tube and the lower sampling tube in the oil tank. In addition, the inner walls of the upper sampling tube, the middle sampling tube and the lower sampling tube can be scraped when the hoop ring moves through the cooperation of the deformable movable member, the magnetic sliding shaft and the magnetic ring, thereby further improving the discharge effect of residual oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall appearance structure of the first to third embodiments of the present application;

[0019] Figure 2 This is a diagram of the internal structure of an oil tank according to the first embodiment of the present application;

[0020] Figure 3 For this application Figure 2 A is an enlarged schematic diagram;

[0021] Figure 4 For this application Figure 2 The enlarged schematic diagram of point B in FIG.

[0022] Figure 5 This is a diagram showing the internal structure of a closed box according to the first embodiment of the present application;

[0023] Figure 6 This is a state diagram of the change of the positions of the upper sampling tube, the middle sampling tube and the lower sampling tube inside when the telescopic frame of the first embodiment of the present application is pressed down;

[0024] Figure 7 This is a state diagram of the upper sampling tube being lifted to promote drainage in the first embodiment of the present application;

[0025] Figure 8 This is a state diagram of the first embodiment of the present application in which the winding rope is lifted and shaken by forward and reverse rotation;

[0026] Fig. 9 This is a state diagram of the upper sampling tube of the second embodiment of the present application when the length of the upper sampling tube in the oil tank is too long and the lifting and drainage are incomplete;

[0027] Fig.10 This is a schematic diagram of the structure of a small electric extension pole according to the second embodiment of the present application;

[0028] Fig.11 This is a state diagram of the hoop movement driving the lifting point change in the second embodiment of the present application;

[0029] Fig.12 This is a schematic structural diagram of a deformable movable member, a magnetic attraction ring, and a magnetic attraction sliding shaft according to a third embodiment of the present application;

[0030] Fig.13 This is a state diagram of the hand pump starting sampling when the electrorheological fluid in the deformable movable member of the third embodiment of the present application is not energized;

[0031] Fig.14 This is a state diagram of the third embodiment of the present application, when the electrorheological fluid in the deformable movable member is energized and the residual oil in the upper sampling tube located in the outer tube body of the oil tank passes through the interior of the deformable movable member in one direction.

[0032] Description of the numbers in the figure:

[0033] 1. Oil tank; 2. Upper sampling tube; 3. Middle sampling tube; 4. Lower sampling tube; 5. Hand pump; 6. Adapter tube; 7. Float; 8. Telescopic frame; 9. One-way branch pipe; 10. Connecting rope; 11. Winding piece; 12. Servo motor; 13. Winding rope; 131. Hoop; 132. Magnetic ring; 133. Magnetic sliding shaft; 134. Deformation moving part; 14. Closing box; 15. Winding motor; 16. Small electric extension rod. DETAILED DESCRIPTION

[0034] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0035] The first implementation method: Figure 1-4A tank sampler is shown, comprising an oil tank 1 and a telescopic frame 8 installed in the oil tank 1, a buoy 7 is movably connected to the upper end of the telescopic frame 8, three supporting shafts are rotatably connected to the surface of the telescopic frame 8 along the height direction, an upper sampling tube 2, a middle sampling tube 3 and a lower sampling tube 4 are respectively installed inside the three supporting shafts, one end of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 extends to the outside of the oil tank 1 and is connected to a transfer tube 6, a hand pump 5 is installed on the surface of the oil tank 1 near the top, and the input end of the hand pump 5 is connected to the transfer tube 6;

[0036] The other ends of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 are all penetrated by a one-way branch tube 9 with a built-in one-way valve installed, and the surfaces of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 and each one-way branch tube 9 are all installed with an electronic valve;

[0037] A servo motor 12 is installed on the top wall of the oil tank 1, and the output end of the servo motor 12 is connected to a winding piece 11 with an elliptical cross-section. An L-shaped support rod is installed on the top wall of the oil tank 1, and the support rod is rotatably connected to the surface of the winding piece 11. The surfaces of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 are all sleeved with hoops 131, and two adjacent hoops 131 are connected by a winding rope 13, and the top winding rope 13 is wrapped around the surface of the winding piece 11.

[0038] Specifically, when performing the under-tank sampling operation, the hand pump 5 is started to drive the oil in the oil tank 1 corresponding to the position of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 to be transferred out of the oil tank 1 through the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4, thereby realizing the sampling process;

[0039] During the sampling process, Figure 6 It is shown that, with the compression of the telescopic frame 8, the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 can achieve different sampling heights, thereby achieving sampling processing at different heights;

[0040] After a round of sampling operation is completed, the hand pump 5 stops, and some oil still remains in the tubes of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4, and cannot return to the interior of the oil tank 1 on its own, resulting in the sample oil containing the residual oil from the previous round of sampling in the next round of sampling, which affects the reliability of sampling. Therefore, after the sampling is completed, if Figure 7As shown, the servo motor 12 is started to drive the winding member 11 to rotate, which can drive the winding rope 13 to be wound, thereby driving the hoop 131 and the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 in the hoop 131 to be lifted, and at the same time, the electronic valves on the surfaces of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 are closed and the electronic valve on the surface of the one-way branch 9 is opened, and then with the help of the formed slope design, the residual oil in the tube bodies of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 can be discharged from the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 in one direction through the one-way branch 9. The inside of the tube body of the sample tube 2, the middle sampling tube 3 and the lower sampling tube 4. In addition, since the installation position of the adapter tube 6 is located above the installation position of the upper sampling tube 2, the parts of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 located outside the oil tank 1 are in a slope design. Therefore, after the hand pump 5 stops, the residual oil in the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 located outside the oil tank 1 can flow autonomously into the oil tank 1 under the action of gravity, and then cooperate with the slope design formed by the lifting to promote the discharge of the residual oil.

[0041] In addition, in order to enhance the effect of promoting ovulation, such as Figure 8 As shown, after the servo motor 12 rotates forwardly at an angle of α to achieve lifting, the servo motor 12 rotates reversely at an angle of β, where β is smaller than α, and then rotates forward to return to the angle state of α. Repeating this process multiple times can play a shaking role and promote the discharge of residual oil in the tube body.

[0042] Figure 5 As shown, a connecting rope 10 is connected to the top surface of the telescopic frame 8, a closing box 14 is installed on the bottom wall of the oil tank 1, a winding motor 15 is installed inside the closing box 14, and the output end of the winding motor 15 is connected to a rod body, and the surface of the rod body is wound around the tail end of the connecting rope 10.

[0043] Specifically, in order to ensure that the telescopic frame 8 is stably pressed down when the oil level in the oil tank 1 changes, a winding motor 15 and an involvement rope 10 are designed. When the telescopic frame 8 is pressed down, the winding motor 15 can be started to drive the involvement rope 10 to be wound, thereby pulling the telescopic frame 8 downward, so as to realize the change of the corresponding sampling position following the change of the liquid level in the oil tank 1.

[0044] The installation position of the transfer tube 6 is located above the installation position of the upper sampling tube 2. The upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 are all flexible tubes.

[0045] Specifically, the design of the flexible tube allows the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 to have a certain stretching range, so that the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 can change the sampling points synchronously when the telescopic frame 8 is pressed downward and deformed.

[0046] The installation position of the hoop 131 on the surface of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 is close to the inner wall of the oil tank 1, and the length of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 located inside the oil tank 1 is greater than the horizontal distance between the inner wall of the oil tank 1 and the supporting shaft rod on the surface of the telescopic frame 8.

[0047] Specifically, the position of the hoop 131 can make the lifting position of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 in the oil tank 1 as close to the inner wall of the oil tank 1 as possible when the hoop 131 is lifted, so as to better play the lifting and drainage effect. In addition, the length of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 in the oil tank 1 can make the parts located in the oil tank 1 be in a downward bending state when the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 are at a higher position in the oil tank 1, so as to ensure sufficient subsequent stretching length.

[0048] The second implementation method: Fig.10 It is shown that a small electric extension rod 16 is installed on the inner top wall of the oil tank 1, and the power end of the small electric extension rod 16 is connected to the surface of the servo motor 12, and the support rod is slidably connected to the top wall of the oil tank 1.

[0049] Different from the first embodiment, this embodiment uses a small electric extension rod 16 to drive the hoop 131 to move, thereby compensating for the incomplete lifting and drainage caused by the excessive length of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 in the oil tank 1.

[0050] Specifically, the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 are too long in the oil tank 1, and the winding length of the top winding rope 13 is limited, resulting in a limited lifting height, which leads to the following situation: Fig. 9 When the phenomenon shown is shown, the oil remaining in the tube body cannot be completely discharged;

[0051] Therefore, a small electric extension rod 16 is designed to drive the hoop 131 to move horizontally and approach the center position of the oil tank 1, so as to change the lifting position. Fig.11 As shown, this promotes the complete discharge of residual oil in the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4.

[0052] The third implementation method: Fig.12 It is shown that the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 located in the oil tank 1 are all installed with a deformable movable member 134, a one-way channel is installed inside the deformable movable member 134, a magnetic sliding shaft 133 is installed inside the deformable movable member 134, a magnetic ring 132 is installed on the inner side of the hoop 131, and the magnetic ring 132 and the magnetic sliding shaft 133 attract each other.

[0053] The deformable movable member 134 is composed of an elastic bag and electrorheological fluid in the elastic bag. The elastic bag is made of elastic memory material, and the diameter of the elastic bag is the same as the inner diameter of the upper sampling tube 2 , the middle sampling tube 3 and the lower sampling tube 4 .

[0054] The length of the magnetic sliding shaft 133 is the same as the inner diameters of the upper sampling tube 2 , the middle sampling tube 3 and the lower sampling tube 4 , and the surface of the magnetic sliding shaft 133 is coated with an insulating coating.

[0055] Different from the second embodiment, this embodiment cleans the inner walls of the residual oil in the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 by moving the hoop 131, thereby further improving the degree of promotion of discharge. In this embodiment, the length of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 located outside the oil tank 1 is shorter.

[0056] Specifically, when the hand pump 5 is started, the electrorheological fluid in the deformable movable member 134 is not energized. Therefore, under the impact of the oil body, the deformable movable member 134 is deformed, and there is a gap between the walls of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4, which facilitates the transfer of the sample oil body out of the oil tank 1. Fig.13 As shown;

[0057] After the hand pump 5 is turned off, the electrorheological fluid in the deformable movable member 134 is energized. Since the elastic bag is made of elastic memory material, it will restore to its original circular structure with the same inner diameter as the tube body. When energized, the deformable movable member 134 becomes hardened. The residual oil in the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 located in the outer tube body of the oil tank 1 can flow autonomously to the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 located in the inner tube body of the oil tank 1 through the height difference, and can return through the one-way channel without interference. Fig.14 As shown, when the hoop ring 131 moves subsequently, the hardened deformed movable member 134 is driven by the attraction of the magnetic ring 132 and the magnetic sliding shaft 133 to scrape and clean the inner wall of the tube body.

[0058] In summary, in the present application, the servo motor 12, the winding member 11 and the connecting rope 10 can be used to lift the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 after a single round of sampling, so as to promote the discharge of residual oil therein, and can be shaken after lifting in a forward and reverse manner to promote the complete discharge of residual oil, and the movement of the hoop 131 is driven by the small electric extension rod 16 to drive the switching of the lifting position points on the surfaces of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4, which can make up for the incomplete lifting and discharge caused by the excessive length of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 in the oil tank 1. In addition, through the cooperation of the deformable movable member 134, the magnetic sliding shaft 133 and the magnetic ring 132, the inner walls of the upper sampling tube 2, the middle sampling tube 3 and the lower sampling tube 4 can be scraped when the hoop 131 moves, thereby further improving the discharge effect of residual oil.

[0059] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A tank sampler, comprising an oil tank (1) and a telescopic frame (8) installed in the oil tank (1), characterized in that: The upper end of the telescopic frame (8) is movably connected to a buoy (7), and the surface of the telescopic frame (8) is rotatably connected to three supporting shafts in the height direction. An upper sampling tube (2), a middle sampling tube (3) and a lower sampling tube (4) are respectively installed inside the three supporting shafts. One end of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) extends to the outside of the oil tank (1) and is connected to a transfer tube (6). A hand pump (5) is installed on the surface of the oil tank (1) near the top, and the input end of the hand pump (5) is connected to the transfer tube (6). The other ends of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) are all penetrated by a one-way branch tube (9) equipped with a built-in one-way valve, and the surfaces of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) and each one-way branch tube (9) are all equipped with an electronic valve; A servo motor (12) is installed on the top wall of the oil tank (1), and the output end of the servo motor (12) is connected to a winding piece (11) with an elliptical cross-section. An L-shaped support rod is installed on the top wall of the oil tank (1), and the support rod is rotatably connected to the surface of the winding piece (11). The surfaces of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) are all sleeved with hoops (131), and two adjacent hoops (131) are connected by a winding rope (13), and the uppermost winding rope (13) is wound around the surface of the winding piece (11). After the servo motor (12) rotates forwardly at an angle α to achieve lifting, the servo motor (12) rotates reversely at an angle β, wherein β is less than α, and then rotates forward to return to the state of angle α, which is repeated multiple times.

2. A tank sampler according to claim 1, characterized in that: The top surface of the telescopic frame (8) is connected to a connecting rope (10), the bottom wall of the oil tank (1) is installed with a closing box (14), a winding motor (15) is installed inside the closing box (14), the output end of the winding motor (15) is connected to a rod body, and the surface of the rod body is wound around the tail end of the connecting rope (10).

3. A tank sampler according to claim 1, characterized in that: The installation position of the transfer tube (6) is located above the installation position of the upper sampling tube (2); the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) are all flexible tubes.

4. A tank sampler according to claim 1, characterized in that: The mounting position of the hoops (131) on the surfaces of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) is close to the inner wall of the oil tank (1), and the length of the parts of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) located inside the oil tank (1) is greater than the horizontal distance between the inner wall of the oil tank (1) and the supporting shaft rod on the surface of the telescopic frame (8).

5. A tank sampler according to claim 1, characterized in that: A small electric extension rod (16) is installed on the inner top wall of the oil tank (1), and the power end of the small electric extension rod (16) is connected to the surface of the servo motor (12), and the support rod is slidably connected to the top wall of the oil tank (1).

6. A tank sampler according to claim 5, characterized in that: The upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4) are all provided with a deformable movable member (134) installed inside the oil tank (1); a one-way channel is installed inside the deformable movable member (134); a magnetic attraction sliding shaft (133) is installed inside the deformable movable member (134); a magnetic attraction ring (132) is installed inside the hoop (131); and the magnetic attraction ring (132) and the magnetic attraction sliding shaft (133) attract each other.

7. A tank sampler according to claim 6, characterized in that: The deformable movable member (134) is composed of an elastic bag and an electrorheological fluid in the elastic bag. The elastic bag is made of an elastic memory material, and the diameter of the elastic bag is the same as the inner diameter of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4).

8. A tank sampler according to claim 7, characterized in that: The length of the magnetic sliding shaft (133) is the same as the inner diameters of the upper sampling tube (2), the middle sampling tube (3) and the lower sampling tube (4), and the surface of the magnetic sliding shaft (133) is coated with an insulating coating.

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