An oil sampling and purification device for oil storage tanks

Abstract

This utility model relates to the field of three-stage sampling operation technology for oil storage tanks, and particularly to an oil tank sampling and purification device. It aims to overcome the technical problems of existing methods that require two people to operate the dipstick and sampling rope to control the sampling bottle, leading to difficulties in coordination and direct contact between operators and the sampling rope, which can easily cause oil spillage and contamination. This oil tank sampling and purification device uses a winding wheel to control the release length of the dipstick and a winding wheel to control the release length of the sampling rope. The operator can independently complete the sampling task by operating the winding wheel and winding wheel separately with both hands, without direct contact with the sampling bottle, thus avoiding the problem of oil spillage and contamination. This overcomes the technical problems of existing oil tank sampling methods that require two people to operate the dipstick and sampling rope to control the sampling bottle, leading to difficulties in coordination and direct contact between operators and the sampling rope, which can easily cause oil spillage and contamination.

Description

Technical Field

[0001] This utility model relates to the technical field of three-stage sampling operation of oil storage tanks, and in particular to an oil tank sampling and purification device. Background Technology

[0002] During the extraction, storage, and transportation of crude oil, stratified sampling analysis is necessary to accurately understand the properties and composition of crude oil within storage tanks. Existing sampling methods for oil storage tanks require two people to operate the sampling vessel, one using a dipstick and the other a sampling rope, which is difficult to coordinate. Furthermore, because the operation relies on direct hand-eye coordination, crude oil carried by the sampling rope can contaminate the operator's gloves during the lifting process and drip onto the sampling port and surrounding area, creating oil pollution and posing a risk of environmental contamination.

[0003] Existing oil tank sampling methods have technical problems, such as requiring two people to work together to operate the dipstick and sampling rope to control the sampling bottle, which makes coordination difficult and causes the operator to directly contact the sampling rope, making it easy for crude oil to drip and cause oil pollution. Utility Model Content

[0004] The purpose of this utility model is to provide an oil sampling and purification device for oil storage tanks, so as to overcome the technical problems in related technologies, which require two people to work together to operate the dipstick and sampling rope to control the sampling bottle for sampling, resulting in high coordination difficulty and direct contact between the operator and the sampling rope, which easily leads to oil spillage and oil pollution.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] The oil sampling and purification device for oil storage tanks provided by this utility model includes:

[0007] The system comprises a base frame, a dipstick assembly, a control assembly, and a sampling bottle. The dipstick assembly includes a dipstick and a winding reel. The control assembly includes a sampling rope and a winding reel, both rotatably mounted on the base frame. The sampling bottle is suspended from the end of the dipstick, and the winding reel controls the release length of the dipstick. The end of the sampling rope is connected to a sealing post on the sampling bottle, and the winding reel controls the release length of the sampling rope, thereby opening and closing the sampling port of the sampling bottle.

[0008] Specifically, it also includes a self-locking switching component, which includes a first telescopic unit comprising an axially retractable sliding pin. The dipstick assembly also includes a handwheel, with both ends of the dipstick connected to the winding wheel and the body of the sampling bottle, respectively. The handwheel is mounted on the winding wheel and drives it to rotate, thereby controlling the release length of the dipstick and consequently the insertion depth of the sampling bottle. A locking groove is provided on the side of the handwheel near the first telescopic unit, with multiple locking grooves evenly distributed around the axis of the handwheel. The axial extension of the sliding pin locks the rotation of the handwheel by engaging with the locking groove.

[0009] Specifically, the first telescopic unit further includes a mounting base, a spring, and a locking member. The mounting base is mounted on the base frame, and the sliding pin is inserted into the mounting base, capable of extending or retracting along the axial direction of the mounting base. The mounting base has an opening slot, and the locking member is vertically inserted into the sliding pin. When the locking member is misaligned with the opening slot, the locking member abuts against the end face of the mounting base, thereby locking the sliding pin in the retracted state. When the locking member is aligned with the opening slot, the locking member slides along the opening slot, causing the sliding pin to disengage from the locked state. At this time, the sliding pin is driven by the spring to switch to the extended state and engages with the engaging slot.

[0010] Specifically, the first telescopic unit further includes a retaining ring, which is sleeved on the sliding pin. The sliding pin is provided with a thrust ring, and the thrust ring, the spring, the retaining ring, and the locking member abut against each other in sequence. The retaining ring has a through groove, and the retaining ring is inserted into and welded to the mounting base, with the through groove aligned with the opening groove.

[0011] Specifically, it also includes a cleaning component, which comprises a first cleaning unit, and the first cleaning unit includes a first cleaning block and a second cleaning block respectively disposed at both ends of the dipstick. The self-locking switching component also includes a second telescopic unit, which has the same structure as the first telescopic unit. In the extended state, the sliding pin of the second telescopic unit abuts against the second cleaning block, and drives the second cleaning block to press against the first cleaning block, thereby pressing the dipstick tightly, and scraping off the crude oil adhering to the dipstick when it is retracted.

[0012] Specifically, the cleaning assembly further includes a second cleaning unit, which comprises a support plate and an oil scraper. The oil scraper is mounted to the base frame via the support plate, and the sampling rope is threaded through the oil scraper. The oil scraper is used to scrape off the crude oil adhering to the sampling rope when the sampling rope is wound up.

[0013] Specifically, the control assembly also includes a rope guide plate, one end of which is connected to the base frame, and the other end is pressed radially against the sampling rope wound on the take-up reel. As the sampling rope is wound layer by layer on the take-up reel, the rope guide plate applies a guiding force to the sampling rope pointing towards the axis of the take-up reel, thereby forcing the sampling rope to move towards the area in the current winding layer that has not yet been fully occupied, achieving a uniform distribution of the sampling rope layer by layer, and thus avoiding the problem of the sampling rope shifting and accumulating on the take-up reel.

[0014] Specifically, the control component also includes a crank handle, which is mounted on the winding wheel and used to drive the winding wheel to rotate, thereby adjusting the release length of the sampling rope.

[0015] Specifically, the base frame includes a main support and a clamp, the clamp being fitted onto the gauging port of the oil storage tank. The main support is connected to the clamp, and the dipstick suspending the sampling bottle is wound up by rotating the winding wheel installed on the main support, thereby controlling the insertion depth of the sampling bottle relative to the gauging port.

[0016] Specifically, the base frame also includes a portable handle and an electrostatic discharger. The portable handle is bolted to the top of the main support for easy handling. The electrostatic discharger is a bolt connected to the oil storage tank via a wire, and eliminates static electricity through grounding.

[0017] Based on the above technical solutions, the beneficial effects of this utility model are analyzed as follows:

[0018] This utility model provides an oil sampling and purification device for oil storage tanks, comprising:

[0019] The system comprises a base frame, a dipstick assembly, a control assembly, and a sampling bottle. The dipstick assembly includes a dipstick and a winding reel. The control assembly includes a sampling rope and a winding reel, both rotatably mounted on the base frame. The sampling bottle is suspended from the end of the dipstick, and the winding reel controls the release length of the dipstick. The end of the sampling rope is connected to a sealing post on the sampling bottle, and the winding reel controls the release length of the sampling rope, thereby opening and closing the sampling port of the sampling bottle.

[0020] In practical application, the base frame is installed at the gauging port of the oil storage tank. The body of the sampling bottle is suspended from the end of the dipstick, and the sealing post is connected to the end of the sampling rope. The winding wheel is rotated to lower the sampling bottle from the gauging port to the target sampling depth under its own weight, with the sampling rope lowered along with the bottle. The winding wheel is stopped, allowing the sampling bottle to remain at the target sampling depth. The take-up wheel is rotated in the opposite direction to shorten the release length of the sampling rope, thereby lifting the sealing post. The bottle body does not move upwards under gravity; instead, the sealing post and the bottle body move relative to each other, opening the sampling port. Oil samples at the target sampling depth enter the bottle body, releasing the take-up wheel. The sealing post resets under the action of the sampling bottle's internal spring and closes the sampling port. The winding wheel and take-up wheel are rotated in the opposite direction to lift and retrieve the sampling bottle. Operators can independently complete the sampling task by operating the winding wheel and the take-up wheel separately with both hands, without having to directly contact the sampling bottle, thus avoiding the problem of oil spillage and pollution.

[0021] As can be seen, compared with existing technologies, this oil tank sampling and purification device, by setting up a winding wheel to control the release length of the dipstick and a take-up wheel to control the release length of the sampling rope, allows the operator to independently complete the sampling task by operating the winding wheel and the take-up wheel separately with both hands, without directly contacting the sampling bottle, thus avoiding the problem of dripping oil pollution. This overcomes the technical problems of existing oil tank sampling methods, which require two people to cooperate in operating the dipstick and sampling rope to control the sampling bottle, resulting in high coordination difficulty and direct contact between the operator and the sampling rope, easily leading to dripping crude oil and causing oil pollution. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the overall structure of the oil tank sampling and purification device provided in this embodiment of the utility model. Figure 1 ;

[0024] Figure 2 A schematic diagram of the overall structure of the oil sampling and purification device for the oil storage tank. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the structure of the first cleaning unit when the second telescopic unit is in the retracted state.

[0026] Figure 4 This is a schematic diagram of the structure of the first cleaning unit when the second telescopic unit is in the ejected state.

[0027] Figure 5 for Figure 1 A magnified view of a portion of the first telescopic unit;

[0028] Figure 6 This is a cross-sectional structural diagram of the first telescopic unit in the ejected state.

[0029] Figure 7 This is a cross-sectional view of the first telescopic unit in its retracted state.

[0030] icon:

[0031] 100. Base frame; 110. Main support frame; 120. Clamp; 130. Portable handle; 140. Static discharge device;

[0032] 200. Oil gauge assembly; 210. Oil gauge; 220. Winding wheel; 230. Handwheel; 201. Snap-fit ​​groove;

[0033] 300. Control components; 310. Sampling rope; 320. Reel; 330. Rope bundle guide; 340. Handle;

[0034] 400. Sampling bottle; 410. Bottle body; 420. Sealing column;

[0035] 500. Self-locking switching assembly; 510. First telescopic unit; 511. Sliding pin; 502. Thrust ring; 512. Mounting base; 501. Opening slot; 513. Spring; 514. Locking element; 515. Anti-reverse ring; 503. Through slot; 520. Second telescopic unit;

[0036] 600, Cleaning component; 610, First cleaning unit; 611, First cleaning block; 612, Second cleaning block; 620, Second cleaning unit; 621, Support plate; 622, Oil scraper nozzle. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] Existing oil tank sampling methods have technical problems, such as requiring two people to work together to operate the dipstick and sampling rope to control the sampling bottle, which makes coordination difficult and causes the operator to directly contact the sampling rope, making it easy for crude oil to drip and cause oil pollution.

[0041] In view of this, the present invention provides an oil sampling and purification device for oil storage tanks, comprising:

[0042] The system comprises a base frame 100, a dipstick assembly 200, a control assembly 300, and a sampling bottle 400. The dipstick assembly 200 includes a dipstick 210 and a winding reel 220. The control assembly 300 includes a sampling rope 310 and a winding reel 320, both rotatably mounted on the base frame 100. The sampling bottle 400 is suspended from the end of the dipstick 210, and the winding reel 220 controls the release length of the dipstick 210. The end of the sampling rope 310 is connected to the sealing post 420 of the sampling bottle 400, and the winding reel 320 controls the release length of the sampling rope 310, thereby opening and closing the sampling port of the sampling bottle 400.

[0043] Based on the above technical solutions, the oil sampling and purification device for oil storage tanks provided by this utility model can achieve the following technical effects:

[0044] This oil tank sampling and purification device uses a winding wheel 220 to control the release length of the dipstick 210 and a winding wheel 320 to control the release length of the sampling rope 310. The operator can independently complete the sampling task by operating the winding wheel 220 and the winding wheel 320 separately with both hands, without direct contact with the sampling bottle 400, thus avoiding the problem of dripping oil contamination. This overcomes the technical problems of existing oil tank sampling methods, which require two people to operate the dipstick and sampling rope together to control the sampling bottle, leading to difficulties in coordination and direct contact between the operator and the sampling rope, and the risk of dripping crude oil causing oil contamination.

[0045] The following combination Figures 1 to 7 The structure and shape of the oil tank sampling and purification device provided in this embodiment are described in detail below:

[0046] Regarding the composition of sampling bottle 400, specifically:

[0047] The sampling bottle 400 includes a bottle body 410, a sealing post 420, and a built-in spring. The sealing post 420 includes a sliding rod inserted and sliding within the bottle body 410 and a sealing plug installed at the end of the sliding rod. The sealing plug is located inside the bottle body 410. The bottle body 410 has a sampling port. Under the action of the built-in spring, the sliding rod drives the sealing plug to seal the sampling port from the inside of the bottle body 410. When the sampling rope 310 pulls the sealing post 420 to slide relative to the bottle body 410, the sealing plug disengages from the sampling port, and the sampling port is opened.

[0048] To replace manual labor in performing continuous, fixed, or constrained operations that require little flexibility or technical skill, thereby freeing the operator's hands to perform other tasks requiring greater flexibility, the oil tank sampling and purification device in this embodiment further includes a self-locking switching component 500. The self-locking switching component 500 includes a first telescopic unit 510, which includes an axially retractable sliding pin 511. The dipstick assembly 200 also includes a handwheel 230. The dipstick 210 is connected at both ends to the winding wheel 220 and the body 420 of the sampling bottle 400, respectively. The handwheel 230 is mounted on the winding wheel 220 and is used to drive the winding wheel 220 to rotate and rewind the dipstick 210, thereby controlling the release length of the dipstick 210 and, consequently, the insertion depth of the sampling bottle 400. The handwheel 230 has a locking groove 201 on the side near the first telescopic unit 510, with multiple locking grooves 201 evenly distributed around the axis of the handwheel 230. The axial extension of the sliding pin 511 can lock the rotation of the handwheel 230 by engaging with the locking groove 201. The sampling rope 310 is a lightweight harness that does not automatically descend under its own weight, thus requiring no additional locking structure.

[0049] Regarding the structural composition of the first telescopic unit 510, specifically:

[0050] The first telescopic unit 510 also includes a mounting base 512, a spring 513, and a locking member 514. The mounting base 512 is mounted on the base frame 100, and a sliding pin 511 is inserted into the mounting base 512, capable of extending or retracting along the axial direction of the mounting base 512. The mounting base 512 has an opening slot 501, and the locking member 514 is vertically inserted into the sliding pin 511. When the locking member 514 is misaligned with the opening slot 501, the locking member 514 can abut against the end face of the mounting base 512, thereby locking the sliding pin 511 in the retracted state. When the locking member 514 is aligned with the opening slot 501, the locking member 514 can slide along the opening slot 501 to disengage the sliding pin 511 from the locked state. At this time, the sliding pin 511 is driven by the spring 513 to switch to the extended state and engages with the engaging slot 201.

[0051] Specifically, regarding how spring 513 drives the sliding pin 511 to move:

[0052] The first telescopic unit 510 also includes a retaining ring 515, which is sleeved on the sliding pin 511. The sliding pin 511 is provided with a thrust ring 502, and the thrust ring 502, spring 513, retaining ring 515 and locking member 514 abut against each other in sequence. The retaining ring 515 has a through groove 503, and the retaining ring 515 is inserted into and welded to the mounting base 512, with the through groove 503 aligned with the open groove 501.

[0053] To quickly clean the crude oil adhering to the dipstick 210 during its lowering process, the oil tank sampling and purification device in this embodiment further includes a cleaning component 600. The cleaning component 600 includes a first cleaning unit 610, which comprises a first cleaning block 611 and a second cleaning block 612 respectively disposed at both ends of the dipstick 210. The self-locking switching component 500 also includes a second telescopic unit 520, which has the same structure as the first telescopic unit 510. In the extended state, the sliding pin 511 of the second telescopic unit 520 abuts against the second cleaning block 612, causing the second cleaning block 612 to press against the first cleaning block 611, thereby pressing the dipstick 210 and scraping off the crude oil adhering to the dipstick 210 when it retracts. The opposing surfaces of the first cleaning block 611 and the second cleaning block 612 can be configured as rubber blocks.

[0054] In this embodiment, the cleaning assembly 600 further includes a second cleaning unit 620, which includes a support plate 621 and an oil scraper 622. The oil scraper 622 is mounted on the base frame 100 via the support plate 621, and the sampling rope 310 is threaded through the oil scraper 622. The oil scraper 622 is used to scrape off the crude oil adhering to the sampling rope 310 when the sampling rope 310 is wound up.

[0055] To prevent the sampling rope 310 from piling up to one side while winding on the take-up reel 320, thus preventing it from being evenly distributed along the length of the take-up reel 320, the control component 300 in this embodiment further includes a rope guide plate 330. One end of the rope guide plate 330 is connected to the base frame 100, and the other end presses against the sampling rope 310 wound on the take-up reel 320 radially. As the sampling rope 310 winds layer by layer on the take-up reel 320, the rope guide plate 330 applies a guiding force to the sampling rope 310 pointing towards the axis of the take-up reel 320, thereby forcing the sampling rope 310 to move towards the area in the current winding layer that has not yet been fully occupied, achieving a layer-by-layer even distribution of the sampling rope 310, and thus avoiding the problem of offset piling up of the sampling rope 310 on the take-up reel 320.

[0056] In order to facilitate the rotation of the take-up reel 320, in this embodiment, the control component 300 also includes a rocker arm 340, which is installed on the take-up reel 320 and is used to drive the take-up reel 320 to rotate, thereby adjusting the release length of the sampling rope 310.

[0057] Regarding the structural composition of the base frame 100, specifically:

[0058] The base frame 100 includes a main support 110 and a clamp 120, which is fitted onto the gauging port of the oil storage tank. The main support 110 is connected to the clamp 120, and the dipstick 210 suspending the sampling bottle 400 is wound up by rotating the winding wheel 220 installed on the main support 110, thereby controlling the insertion depth of the sampling bottle 400 relative to the gauging port.

[0059] In this embodiment, the base frame 100 also includes a portable handle 130 and an electrostatic discharger 140. The portable handle 130 is hinged to the top of the main support 110 by bolts for easy handling. The electrostatic discharger 140 is configured as a bolt connected to the oil storage tank via a wire, and eliminates static electricity by grounding.

[0060] In summary, the specific working process of the oil tank sampling and purification device provided in this embodiment is as follows:

[0061] Taking the initial state of the first telescopic unit 510 as the outward state and the initial state of the second telescopic unit 520 as the retracted state as an example.

[0062] Fit the clamp 120 onto the gauging port of the oil storage tank. Pass the dipstick 210 between the first cleaning block 611 and the second cleaning block 612, and suspend the bottle body 410 at the end of the dipstick 210. Switch the second telescopic unit 520 to the ejected state, causing the first cleaning block 611 and the second cleaning block 612 to press the dipstick 210 tightly. Pass the sampling rope 310 through the scraper nozzle 622, and connect the sealing post 420 to the end of the sampling rope 310.

[0063] Pull the locking member 514 to switch the first telescopic unit 510 to the retracted state and release the lock of the handwheel 230. Rotate the winding wheel 220 via the handwheel 230 to lower the sampling bottle 400 from the gauging port to the target sampling depth under its own weight; the sampling rope 310 is lowered along with the sampling bottle 400. Stop rotating the winding wheel 220, pull the locking member 514 to switch the first telescopic unit 510 to the extended state and lock the handwheel 230, so that the sampling bottle 400 remains at the target sampling depth.

[0064] The winding wheel 320 is rotated in the opposite direction to shorten the release length of the sampling rope 310, thereby lifting the sealing column 420. The bottle body 410 does not move upward under the action of gravity. At this time, the sealing column 420 and the bottle body 410 move relative to each other so that the sampling port is opened. The oil sample at the target sampling depth enters the bottle body 410 and releases the winding wheel 320. The sealing column 420 is reset and closes the sampling port under the action of the built-in spring of the sampling bottle 400.

[0065] Pull the locking member 514 to switch the first telescopic unit 510 to the retracted state, causing the sliding pin 511 to disengage from the locking groove 201 and releasing the lock on the handwheel 230. Rotate the winding wheel 220 and the take-up wheel 320 in the opposite direction to lift and retrieve the sampling bottle 400. Pull the locking member 514 to switch the first telescopic unit 510 to the extended state and lock the handwheel 230. During the lifting process, the first cleaning block 611 and the second cleaning block 612 scrape off the crude oil contaminated with the dipstick 210, and the oil scraper nozzle 622 scrapes off the crude oil contaminated with the sampling rope 310.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An oil tank sampling and clean oil device characterized by comprising: include: The system comprises a base frame (100), a dipstick assembly (200), a control assembly (300), and a sampling bottle (400). The dipstick assembly (200) includes a dipstick (210) and a winding wheel (220). The control assembly (300) includes a sampling rope (310) and a winding wheel (320). The winding wheel (220) and the winding wheel (320) are rotatably mounted on the base frame (100). The sampling bottle (400) is suspended from the end of the dipstick (210). The winding wheel (220) is used to control the release length of the dipstick (210). The end of the sampling rope (310) is connected to the sealing post (410) of the sampling bottle (400). The winding wheel (320) is used to control the release length of the sampling rope (310), thereby opening and closing the sampling port of the sampling bottle (400).

2. The oil sampling and purification device for oil storage tanks according to claim 1, characterized in that: It also includes a self-locking switching component (500), which includes a first telescopic unit (510) and the first telescopic unit (510) includes an axially telescopic sliding pin (511). The dipstick assembly (200) also includes a handwheel (230), and the two ends of the dipstick (210) are respectively connected to the winding wheel (220) and the body (420) of the sampling bottle (400); The handwheel (230) is mounted on the winding wheel (220) and is used to drive the winding wheel (220) to rotate to wind up the dipstick (210), thereby controlling the release length of the dipstick (210) and thus controlling the insertion depth of the sampling bottle (400). The handwheel (230) has a snap-fit ​​groove (201) on the side near the first telescopic unit (510), and a plurality of snap-fit ​​grooves (201) are evenly distributed around the axis of the handwheel (230); The axial extension of the sliding pin (511) can lock the rotation of the handwheel (230) by engaging with the locking groove (201).

3. The oil sampling and purification device for oil storage tanks according to claim 2, characterized in that: The first telescopic unit (510) also includes a mounting base (512), a spring (513), and a locking member (514); The mounting base (512) is mounted on the base frame (100), and the sliding pin (511) is inserted into the mounting base (512) and can push out or retract the mounting base (512) along the axial direction of the mounting base (512). The mounting base (512) has an opening slot (501), and the locking member (514) is vertically inserted into the sliding pin (511); When the locking member (514) is misaligned with the opening slot (501), the locking member (514) can lock the sliding pin (511) in the retracted state by abutting against the end face of the mounting base (512); When the locking member (514) is aligned with the opening groove (501), the locking member (514) can slide along the opening groove (501) to disengage the sliding pin (511) from the locked state. At this time, the sliding pin (511) is driven by the spring (513) to switch to the ejected state and is engaged in the engaging groove (201).

4. The oil sampling and purification device for oil storage tanks according to claim 3, characterized in that: The first telescopic unit (510) further includes a backstop ring (515), which is sleeved on the sliding pin (511); The sliding pin (511) is provided with a thrust ring (502), and the thrust ring (502), the spring (513), the anti-reverse ring (515) and the locking member (514) abut against each other in sequence; The anti-reverse ring (515) has a through groove (503), the anti-reverse ring (515) is inserted and welded to the mounting base (512), and the through groove (503) is aligned with the opening groove (501).

5. The oil sampling and purification device for oil storage tanks according to claim 4, characterized in that: It also includes a cleaning component (600), which includes a first cleaning unit (610), the first cleaning unit (610) including a first cleaning block (611) and a second cleaning block (612) respectively disposed at both ends of the dipstick (210); The self-locking switching assembly (500) further includes a second telescopic unit (520), which has the same structure as the first telescopic unit (510); In the ejected state, the sliding pin (511) of the second telescopic unit (520) abuts against the second cleaning block (612) and drives the second cleaning block (612) to press against the first cleaning block (611) to press the dipstick (210) tightly, thereby scraping off the crude oil contaminated on the dipstick (210) when the dipstick (210) is retracted.

6. The oil sampling and purification device for oil storage tanks according to claim 5, characterized in that: The cleaning assembly (600) further includes a second cleaning unit (620), which includes a support plate (621) and a scraper nozzle (622); The oil scraper nozzle (622) is mounted on the base frame (100) via the support plate (621), and the sampling rope (310) is threaded through the oil scraper nozzle (622); The scraper nozzle (622) is used to scrape off the crude oil adhering to the sampling rope (310) when the sampling rope (310) is wound up.

7. The oil sampling and purification device for oil storage tanks according to claim 1, characterized in that: The control assembly (300) also includes a rope guide plate (330), one end of which is connected to the base frame (100), and the other end is pressed radially against the sampling rope (310) wound on the winding wheel (320). As the sampling rope (310) is wound layer by layer on the take-up reel (320), the rope guide plate (330) applies a guiding force to the sampling rope (310) pointing towards the axis of the take-up reel (320), thereby forcing the sampling rope (310) to move towards the area in the current winding layer that has not yet been fully occupied, so as to achieve the uniform distribution of the sampling rope (310) layer by layer, thereby avoiding the problem of the sampling rope (310) shifting and accumulating on the take-up reel (320).

8. The oil sampling and purification device for oil storage tanks according to claim 1, characterized in that: The control component (300) also includes a crank (340) mounted on the winding reel (320) for driving the winding reel (320) to rotate, thereby adjusting the release length of the sampling rope (310).

9. The oil sampling and purification device for oil storage tanks according to claim 1, characterized in that: The base frame (100) includes a main support (110) and a clamp (120), the clamp (120) being fitted onto the oil gauging port of the oil storage tank; The main support (110) is connected to the clamp (120), and the oil dipstick (210) suspending the sampling bottle (400) is wound up by the winding wheel (220) installed on the main support (110), thereby controlling the insertion depth of the sampling bottle (400) relative to the oil measuring port.

10. The oil sampling and purification device for an oil storage tank according to claim 9, characterized in that: The base frame (100) also includes a portable handle (130) and an electrostatic discharger (140). The portable handle (130) is bolted to the top of the main support (110) for easy handling. The static discharger (140) is configured to be connected to the oil storage tank via a wire and to eliminate static electricity by grounding.

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