Mechanical cleaning component for oil storage tank

Abstract

The invention relates to the technical field of oil storage tank cleaning equipment, and particularly discloses an oil storage tank mechanical cleaning component which comprises a driving system, a liquid inlet, a mounting pipe and a water flow nozzle, the fluid downstream of the mounting pipe is communicated with a pressure regulating pipe, the bottom end of the pressure regulating pipe is connected with a nozzle base through a flange, and the water flow nozzle is rotationally mounted on the base; the top end of the central shaft is connected with a driving system, and the bottom end of the central shaft is connected with a water flow nozzle through a transmission mechanism; a pressure regulating mechanism is arranged in an inner cavity of the pressure regulating pipe and comprises opposite pressure regulating blocks and a rotating ring with a non-circular closed annular guide rail, the pressure regulating blocks are matched with the rail through a guide assembly, and the rotating ring rotates to drive the pressure regulating blocks to do radial reciprocating motion; the sectional area of a flow channel is dynamically changed through pure mechanical linkage, jet flow kinetic energy attenuation at the swing angle in the middle of the water flow nozzle is compensated, a weak cleaning area is eliminated, no electrical element meets the anti-explosion requirement, a special-shaped rotating ring can be replaced to be matched with multiple storage tanks, and cleaning thoroughness and scene adaptability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil tank cleaning equipment, and in particular relates to a mechanical cleaning component for an oil tank. Background Art

[0002] In the field of oil storage, crude oil extracted from strata needs to be temporarily stored in large oil storage tanks. After long-term use, sediments such as sludge, wax, and mechanical impurities are easily accumulated in the tanks, which not only reduces the effective volume of the tanks, but may also block oil pipelines, threatening the safety of oil storage and the life of the tank structure. Therefore, regular cleaning operations must be carried out in accordance with the "Oil Tank Cleaning Safety Technical Regulations." Existing mechanical cleaning machines for dome tanks are usually inserted into the tank through the breather valve or light hole on the tank top. The pneumatic motor is driven by compressed air, and the nozzle assembly is rotated through a gear transmission system. The cleaning parameters can also be manually adjusted. The cleaning fluid is sprayed out from the nozzle after being concentrated and pressurized, forming a spiral covering trajectory of 360° horizontally and 140° vertically. In theory, it can achieve comprehensive cleaning by stirring and dissolving residual oil on the bottom and wall of the tank.

[0003] However, in the actual cleaning process, since the nozzle swings back and forth within a vertical range of 140°, its distance from the tank wall and bottom changes significantly with the swing angle, resulting in uneven distribution of the jet impact force: when the nozzle is near 0° (vertical downward) or 90° (horizontal), the jet landing area is closer, the impact force is stronger, and the cleaning effect is better; but when the nozzle swings to an intermediate angle such as 45° or 135°, the path for the jet to reach the tank wall or bottom is the longest, the kinetic energy is severely attenuated, the impact force is significantly reduced, and it is difficult to effectively peel off firmly attached deposits; this phenomenon leads to obvious weak strength areas in the cleaning trajectory, especially at the edge of the tank bottom connected to the tank wall and the middle area of ​​the tank wall, where oil and dirt are easily retained, becoming a key technical bottleneck restricting the thoroughness and consistency of cleaning. Summary of the Invention

[0004] The purpose of the present invention is to provide a mechanical cleaning component for an oil storage tank to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A mechanical cleaning component for an oil storage tank comprises: a drive system, a liquid inlet, a mounting pipe, and a water nozzle, wherein the drive system is arranged at the top end of the mounting pipe, the liquid inlet is arranged at the side end of the mounting pipe, a pressure regulating pipe is connected to the fluid downstream of the mounting pipe, the bottom end of the pressure regulating pipe is connected to a nozzle base via a flange, a water nozzle is rotatably mounted on the lower end of the nozzle base, a central shaft is arranged at the center of the inner cavity of the mounting pipe, the top end of the central shaft is connected to the drive system, and the bottom end is connected to the water nozzle via a transmission mechanism, and a pressure regulating mechanism is arranged in the inner cavity of the pressure regulating pipe; The pressure regulating mechanism includes two relatively arranged pressure regulating blocks and a rotating ring linked to the drive system. The rotating ring is provided with a non-circular closed ring guide track. The pressure regulating block cooperates with the guide track through a guide assembly, so that the rotational movement of the rotating ring can drive the pressure regulating block to reciprocate radially.

[0006] Preferably, the profile of the rotating ring is a regular quadrangular star, the tangent line at the most concave point of its inner wall is tangent to the inner cavity wall of the pressure regulating tube, and the guide track is provided on the side where the rotating ring is connected to the pressure regulating block.

[0007] Preferably, the pressure regulating mechanism includes two rotating rings, which are symmetrically arranged on the top and bottom surfaces of the two pressure regulating blocks respectively. The guide assembly is a guide ball. The top and bottom surfaces of the pressure regulating block are provided with ball sockets corresponding to the guide balls. The guide balls are rolled between the track and the ball sockets, and the centers of the guide balls on the top and bottom surfaces are located on the same vertical axis.

[0008] Preferably, the total thickness of the two rotating rings and the two pressure-regulating blocks superimposed in the axial direction is equal to the axial height of the inner cavity of the pressure-regulating tube.

[0009] Preferably, semi-conical drainage grooves are symmetrically opened on opposite sides of the two pressure regulating blocks, and the top radius of the drainage grooves is larger than the bottom radius. When the distance between the two pressure regulating blocks is the smallest, the two drainage grooves are spliced ​​to form a complete conical flow channel.

[0010] Preferably, the pressure regulating mechanism also includes a limit assembly, which includes two limit blocks symmetrically arranged on both sides of the two pressure regulating blocks, the opposite sides of the two limit blocks are slidably fitted with the inner wall of the pressure regulating tube, and the opposite side is a plane, fitted with the side wall of the pressure regulating block, and multiple sockets are provided on both sides of the pressure regulating block, and a limit roller is rotatably inserted in the socket, and a guide groove cooperating with the limit roller is provided on the limit block, and the extension direction of the guide groove is consistent with the movement direction of the pressure regulating block.

[0011] Preferably, the swivel is detachably connected to the central shaft via a connecting frame.

[0012] Compared with the prior art, the present invention has the following beneficial effects: When the nozzle of an existing oil tank cleaning machine moves within a 140° vertical swing angle range, the distance from the tank wall and bottom changes with the swing angle, resulting in severe attenuation of the jet kinetic energy at intermediate angles such as 45° and 135°. This makes it impossible to effectively remove stubborn deposits, forming a weak cleaning area. The present invention arranges a pressure regulating pipe and a pressure regulating mechanism downstream of the installation pipe fluid, and utilizes a swivel with a non-circular closed loop guide track to drive the relatively arranged pressure regulating block to reciprocate radially. When the water flow nozzle is at a long-distance intermediate angle, the swivel track drives the pressure regulating block closer, reducing the flow channel cross-sectional area to increase the pressure and flow rate of the cleaning fluid and compensate for the kinetic energy attenuation; when the water flow nozzle is at a close-range extreme angle, the swivel track drives the pressure regulating block away, expanding the flow channel cross-sectional area to avoid overshoot and damage to the tank wall. This design does not require additional power, and purely mechanical linkage can achieve uniform impact force within the entire swing angle range, effectively eliminating weak cleaning areas. Compared with the existing technology, it can reduce the thickness of residual oil and dirt on the tank wall and bottom, and improve the thoroughness of cleaning.

[0013] At the same time, the present invention adopts a purely mechanical structure throughout (linkage between the swivel and the voltage regulating block, symmetrical arrangement of the double swivels, semi-conical drainage grooves, limit components, etc.), without any electrical components, and naturally meets the explosion-proof requirements of petrochemical scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A perspective view of the present invention; Figure 2 A top view of the pressure regulating mechanism of the present invention when the two pressure regulating blocks are at the maximum distance; Figure 3 It is an exploded diagram of the structure of the pressure regulating mechanism of the present invention; Figure 4 This is an exploded view of the structure of the limit assembly of the present invention; Figure 5 It is a front cross-sectional view of the present invention when the two voltage regulating blocks are at the minimum distance; Figure 6 A side cross-sectional view of the present invention when two voltage regulating blocks are at a minimum distance; In the figure: 1. Drive system; 2. Liquid inlet; 3. Mounting pipe; 4. Pressure regulating pipe; 5. Nozzle base; 6. Water nozzle; 7. Center axis; 8. Swivel; 9. Guide track; 10. Guide ball; 11. Pressure regulating block; 12. Drainage groove; 13. Limit roller; 14. Limit block; 15. Guide groove; 16. Connecting frame. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0017] As attached Figure 1 To the attached Figure 6 As shown: Example 1:

[0018] The present invention provides a mechanical cleaning component for an oil storage tank, comprising a drive system 1, a liquid inlet 2, a mounting pipe 3, a water nozzle 6, a pressure regulating pipe 4, a nozzle base 5, a central shaft 7 and a pressure regulating mechanism; wherein the drive system 1 adopts a vane-type pneumatic motor well known in the art to avoid the risk of electric sparks and meet the explosion-proof requirements of petrochemical tank areas; the liquid inlet 2 is a standard internal thread interface adapted to the output pipeline of a high-pressure cleaning pump; the mounting pipe 3 is a stainless steel seamless pipe to ensure rigidity under high pressure; the water nozzle 6 is a cluster booster nozzle in the prior art and has basic boosting capability.

[0019] Specific structure: The pressure regulating mechanism includes two relatively arranged pressure regulating blocks 11, a swivel 8 and a guide assembly. The outline of the swivel 8 is a regular four-pointed star, and the tangent at the most concave point of its inner wall is tangent to the inner wall of the pressure regulating tube 4. A non-circular closed ring guide track 9 is provided on the side of the swivel 8 facing the pressure regulating block 11. The guide assembly is a guide ball 10. The top surface of the pressure regulating block 11 is provided with a ball socket adapted to the guide ball 10. The swivel 8 is detachably connected to the center shaft 7 through the connecting frame 16. The detachable connection method includes but is not limited to all possible connection methods such as card slot plug-in, which is a well-known means for those skilled in the art and will not be repeated here. The top of the center shaft 7 is connected to the output end of the drive system 1 through a spline, and the bottom end is connected to the water nozzle 6 through a bevel gear transmission mechanism known in the art to realize the linked rotation of the swivel 8 and the water nozzle 6. The bottom end of the pressure regulating tube 4 is sealed with the nozzle base 5 through a standard flange, and the flange sealing surface adopts a metal wound gasket.

[0020] Assembly method: After assembling the drive system 1, mounting tube 3, pressure regulating tube 4 and center shaft 7 together, the connecting frame 16 is fixedly set on the center shaft 7, and the swivel 8 is plugged into the connecting frame 16 through the slot, and make sure that the guide track 9 on it faces the water outlet end, and embed the guide ball 10 into the ball socket on the top surface of the pressure regulating block 11, and then place the two pressure regulating blocks 11 relative to each other under the swivel 8, so that the guide ball 10 is stuck in the guide track 9 of the swivel 8. At this time, the pressure regulating block 11 can roll freely along the guide track 9, and then align the flange at the bottom end of the pressure regulating tube 4 with the flange of the nozzle base 5, insert the bolts to fix it, and complete the overall assembly. Note that during installation, if the two pressure regulating blocks 11 are at the maximum distance during installation, then when installing the water nozzle 6, pay attention to making its water outlet vertically downward or horizontally outward. Here, the meshing and docking of the bevel gears should be continuously adjusted, and then the entire cleaning machine is inserted into the breathing valve and fixed with a fixing clamp.

[0021] Working process: Connect the liquid inlet 2 to the external high-pressure cleaning pump and introduce compressed air into the drive system 1. At this time, the drive system 1 drives the central shaft 7 to rotate. The central shaft 7 drives the water nozzle 6 to rotate synchronously through the synchronously driven bevel gear mechanism. The water nozzle 6 synchronously completes a horizontal 360° rotation and a vertical 140° swing. At the same time, the swivel 8 rotates synchronously with the central shaft 7 to ensure that the concave points of the regular square star-shaped track of the swivel 8 always accurately correspond to the swing angle of the water nozzle 6.

[0022] When the water nozzle 6 swings to an intermediate angle of 45° or 135° and is at its farthest distance from the tank wall, the concave point of the regular four-pointed star-shaped guide track 9 of the swivel 8 rotates to the position of the guide ball 10, pushing the two pressure regulating blocks 11 radially closer, the distance between the two pressure regulating blocks 11 is reduced, and the cross-sectional area of ​​the flow channel is reduced. According to the principles of fluid mechanics, the reduction in the cross-sectional area of ​​the flow channel increases the flow rate and pressure of the cleaning fluid, compensating for the kinetic energy attenuation caused by the increase in distance.

[0023] When the water nozzle 6 swings to 0° (vertically downward) or 90° (horizontally), the convex point of the guide track 9 of the swivel 8 rotates to the position of the guide ball 10, driving the guide ball 10 to move toward the inner wall of the pressure regulating tube 4. The pressure regulating block 11 moves away radially, with the maximum spacing, the maximum cross-sectional area of ​​the flow channel, and the pressure of the cleaning liquid decreases. In this way, the water nozzle 6 swings synchronously and cyclically to achieve uniform impact force within the full swing angle range.

[0024] Working principle: The core innovation of this embodiment lies in the "linkage of the regular square star-shaped swivel 8". The bevel gear mechanism ensures the synchronous transmission of the central shaft 7 and the water nozzle 6, so that the rotation of the swivel 8 is precisely synchronized with the swing angle of the water nozzle 6. The concave points of the regular square star track can be exactly aligned with the intermediate angles of the nozzle such as 45° and 135° where the impact force is weak. The cross-sectional area of ​​the flow channel is dynamically adjusted through the radial reciprocating motion of the pressure regulating block 11 to compensate for the attenuation of kinetic energy over long distances. The overall structure does not require any electrical components, and the purely mechanical structure realizes adaptive pressure regulation, which is suitable for petrochemical explosion-proof scenarios. Example 2:

[0025] This embodiment is basically the same as the previous embodiment, except that the pressure regulating mechanism adopts a symmetrical arrangement of double rotating rings 8, and the pressure regulating block 11 is additionally provided with a semi-conical drainage groove 12 to optimize the liquid flow stability; it is suitable for scenarios where the cleaning liquid contains trace impurities such as sludge particles, and reduces impurity deposition caused by sudden changes in the flow channel.

[0026] Specific structural differences: the pressure regulating mechanism includes two swivels 8, which are symmetrically arranged on the top and bottom surfaces of the two pressure regulating blocks 11, and the guide tracks 9 of the two swivels 8 are mirror-symmetrical; the guide assembly is still the guide ball 10, and ball sockets are provided at the corresponding positions of the top and bottom surfaces of the pressure regulating block 11. The centers of the guide balls 10 on the top and bottom surfaces are located on the same vertical axis, ensuring that the pressure regulating block 11 is subjected to uniform force up and down. Note that the two swivels 8 are detachably connected to the central shaft 7 through the connecting frame 16, and rotate synchronously with the central shaft 7. Due to the synchronous transmission of the bevel gears, the track concave points of the two swivels 8 still precisely correspond to the 45° and 135° swing angles of the water nozzle 6.

[0027] Semi-conical drainage grooves 12 are symmetrically opened on the opposite sides of the two pressure regulating blocks 11, and the top radius of the drainage grooves 12 is consistent with the radius of the inner tube of the installation tube 3; when the distance between the two pressure regulating blocks 11 is the smallest, the two drainage grooves 12 are spliced ​​to form a complete conical flow channel, reducing liquid flow vortex.

[0028] The total axially superimposed thickness of the two swivels 8 and the two pressure-regulating blocks 11 is equal to the axial height of the inner cavity of the pressure-regulating tube 4 (a certain error space is allowed), ensuring that the pressure-regulating mechanism has no axial movement in the pressure-regulating tube 4, improving the structural stability under high pressure, and preventing axial movement from affecting the corresponding accuracy of the swing angle of the swivel 8 and the water nozzle 6.

[0029] Assembly method difference: Install the upper swivel 8, pressure regulating block 11 and lower swivel 8 in the middle of the central shaft 7 from top to bottom in sequence. The upper and lower swivels 8 are connected with the central shaft 7 through the connecting frame 16. When installing, the special positioning tool is needed to calibrate the guide rail 9 of the two swivels 8 to ensure that the track concave points of the upper and lower swivels 8 are completely synchronized and correspond to the 45° and 135° swing angle of the nozzle, avoiding the track misalignment causing the pressure regulating block 11 to be stuck or the pressure regulating time to be offset.

[0030] The drainage groove 12 of the pressure regulating block 11 needs to be formed by five-axis milling during processing to ensure the coaxiality of the two drainage grooves 12. When assembling, the drainage grooves 12 of the two pressure regulating blocks 11 are placed opposite to each other, and the guide ball 10 cooperates with the guide rail 9 of the upper and lower swivels 8 to ensure that the drainage grooves 12 are not misaligned after splicing. At this time, the central shaft 7 needs to be rotated again to calibrate: whether the two pressure regulating blocks 11 start to approach exactly when the water flow nozzle 6 swings to 45°, to ensure that the flow passage after splicing the drainage grooves 12 can take effect accurately under long-distance working conditions.

[0031] Working process difference: When the cleaning liquid flows through the pressure regulating mechanism, the circular cone-shaped flow passage is formed by splicing the drainage grooves 12, which makes the liquid flow smoothly transition from large diameter to small diameter, and the flow rate uniformly increases along the axial direction of the flow passage, avoiding the local vortex caused by the "right-angle transition flow passage" in embodiment one. Even if the cleaning liquid contains oil and sludge particles, they can also pass through with smooth liquid flow and are not easy to deposit in the flow passage dead angle.

[0032] Working principle: Based on the "regular quadrangular star-shaped swivel 8" in embodiment one, this embodiment adds the "double swivel 8 + circular cone flow passage efficiency" innovation. The double swivel 8 is designed symmetrically to strengthen the movement synchronization of the pressure regulating block 11, and the circular cone flow passage reduces the liquid flow loss and improves the pressure transmission efficiency. It is suitable for cleaning of storage tanks with high impurity content, and takes into account the pressure regulating precision and anti-clogging ability. Embodiment three:

[0033] This embodiment is basically the same as the previous embodiment, the difference is that a limiting component is added to limit the non-radial degree of freedom of the pressure regulating block 11, which is suitable for harsh cleaning scenes with high pressure and high vibration, avoiding the pressure regulating failure caused by the vibration offset of the pressure regulating block 11.

[0034] Specific structural differences: the limit assembly includes two limit blocks 14, a limit roller 13 and a guide groove 15 symmetrically arranged on both sides of the pressure regulating block 11. The limit block 14 is an arc-shaped cylinder, and its opposite side slides in contact with the inner wall of the pressure regulating tube 4, and the opposite side is a finely machined plane, which fits with the side wall of the pressure regulating block 11. Two sockets are provided on both sides of the pressure regulating block 11 along the direction close to the center axis 7. The limit roller 13 is rotatably inserted into the socket. A guide groove 15 cooperating with the limit roller 13 is provided on the limit block 14. The extension direction of the guide groove 15 is consistent with the radial movement direction of the pressure regulating block 11. The limit assembly only limits the non-radial freedom of the pressure regulating block 11, does not affect its radial movement, and thus does not interfere with the correspondence between the swivel 8 and the nozzle swing angle.

[0035] Differences in assembly methods: The connecting frame 16 is fixedly set on the central axis 7, and the first swivel 8 is plugged into the connecting frame 16 through the card slot, and make sure that the guide track 9 on it faces the water outlet end, then apply grease to the limit roller 13 and insert it into the socket of the pressure regulating block 11, making sure that the roller can rotate freely, and then place the pressure regulating block 11 between the two limit blocks 14, so that the limit roller 13 is stuck in the guide groove 15 of the limit block 14. At this time, the pressure regulating block 11 can only move radially along the guide groove 15. If the two pressure regulating blocks 11 are at the maximum distance, they are placed in the pressure regulating pipe 4. , choose to place a guide ball 10 at the two symmetrical convex corner positions of the guide track 9 respectively. At this time, the ball sockets of the two pressure regulating blocks 11 can be smoothly inserted into the outer periphery of the corresponding guide ball 10, and then place a guide ball 10 in the ball sockets on the bottom surfaces of the two pressure regulating blocks 11 respectively. Finally, fit the other swivel 8 to the bottom surface of the pressure regulating block 11, and limit the guide ball 10 through the guide track 9. Confirm that when the water nozzle 6 is swung to 45°, the distance that the pressure regulating block 11 approaches along the guide groove 15 is consistent with the design value, and there will be no jamming or offset due to the limit component.

[0036] Difference in working process: During high-pressure cleaning operations, the pressure regulating block 11 of the second embodiment may produce circumferential offset due to reaction force vibration, resulting in an increase in the control error of the flow channel cross-sectional area; in this embodiment, the limiting roller 13 rolls along the guide groove 15, and the plane of the limiting block 14 fits the side wall of the pressure regulating block 11, strictly limiting the axial up and down and circumferential rotational freedom of the pressure regulating block 11, and only retaining radial movement space. In this way, even under continuous vibration conditions, the offset of the pressure regulating block 11 is very small.

[0037] Working principle: Based on the "double swivel 8 + drainage groove 12" of Example 2, this embodiment adds the innovation of "mechanical limit stabilization". Through the cooperation of the limit block 14 and the limit roller 13, the movement freedom of the pressure regulating block 11 is restricted from "three-dimensional" to "one-dimensional radial", offsetting the vibration interference caused by the high-pressure injection reaction force; the rolling cooperation of the guide groove 15 and the roller reduces the movement resistance, ensuring that the pressure regulating block 11 responds quickly, which is suitable for high-intensity cleaning of large storage tanks, taking into account both stability and dynamic response.

[0038] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A mechanical cleaning component for an oil tank, characterized in that: include: A driving system (1), a liquid inlet (2), a mounting tube (3) and a water flow nozzle (6), wherein the driving system (1) is arranged at the top end of the mounting tube (3), the liquid inlet (2) is arranged at the side end of the mounting tube (3), the fluid downstream of the mounting tube (3) is connected to a pressure regulating tube (4), the bottom end of the pressure regulating tube (4) is connected to a nozzle base (5) through a flange, the lower end of the nozzle base (5) is rotatably mounted with a water flow nozzle (6), a central shaft (7) is arranged at the center of the inner cavity of the mounting tube (3), the top end of the central shaft (7) is connected to the driving system (1), and the bottom end is connected to the water flow nozzle (6) through a transmission mechanism, and the inner cavity of the pressure regulating tube (4) is provided with a pressure regulating mechanism; The pressure regulating mechanism comprises two pressure regulating blocks (11) arranged opposite to each other and a rotating ring (8) linked to a driving system (1); a non-circular closed annular guide track (9) is provided on the rotating ring (8); the pressure regulating block (11) cooperates with the guide track (9) through a guide assembly, so that the rotational movement of the rotating ring (8) can drive the pressure regulating block (11) to reciprocate in the radial direction.

2. The oil tank mechanical cleaning component according to claim 1, characterized in that: The profile of the rotating ring (8) is in the shape of a regular quadrangular star, and the tangent line at the most concave point of its inner wall is tangent to the inner wall of the pressure regulating tube (4), and the guide track (9) is provided on the side where the rotating ring (8) and the pressure regulating block (11) meet.

3. The oil tank mechanical cleaning component according to claim 2, characterized in that: The pressure regulating mechanism comprises two rotating rings (8), which are symmetrically arranged on the top and bottom surfaces of the two pressure regulating blocks (11), respectively. The guide assembly is a guide ball (10), and ball sockets adapted to the guide ball (10) are provided at corresponding positions on the top and bottom surfaces of the pressure regulating block (11). The guide ball (10) is rollingly arranged between the track and the ball socket, and the centers of the guide balls (10) on the top and bottom surfaces are located on the same vertical axis.

4. The oil tank mechanical cleaning component according to claim 3, characterized in that: The total thickness of the two rotating rings (8) and the two pressure regulating blocks (11) superimposed in the axial direction is equal to the axial height of the inner cavity of the pressure regulating tube (4).

5. The oil tank mechanical cleaning component according to claim 4, characterized in that: A semi-conical drainage groove (12) is symmetrically provided on opposite sides of the two pressure regulating blocks (11), wherein the top radius of the drainage groove (12) is larger than the bottom radius. When the distance between the two pressure regulating blocks (11) is the smallest, the two drainage grooves (12) are spliced ​​together to form a complete conical flow channel.

6. The oil tank mechanical cleaning component according to any one of claims 1 to 5, characterized in that: The pressure regulating mechanism also includes a limiting component, which includes two limiting blocks (14) symmetrically arranged on both sides of the two pressure regulating blocks (11), the opposite sides of the two limiting blocks (14) are slidably fitted with the inner wall of the pressure regulating tube (4), and the opposite side is a plane, which fits with the side wall of the pressure regulating block (11), and a plurality of jacks are provided on both sides of the pressure regulating block (11), and limiting rollers (13) are rotatably inserted in the jacks. A guide groove (15) is provided on the limiting block (14) to cooperate with the limiting roller (13), and the extension direction of the guide groove (15) is consistent with the movement direction of the pressure regulating block (11).

7. The oil tank mechanical cleaning component according to claim 2, characterized in that: The rotating ring (8) is detachably connected to the central shaft (7) via a connecting frame (16).

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