Spiral pump type oil storage tank oil sediment cleaning device

Abstract

The utility model discloses a spiral pump type oil storage tank oil sediment cleaning device which comprises a peak making assembly, a pollution discharge assembly and a blind plate, the peak making assembly comprises a peak making propeller, the peak making propeller is connected with a spiral pump, the blind plate is detachably connected with a discharge port preset in the lower portion of an oil storage tank, and the blind plate is provided with a water inlet, a sediment discharge port and a plurality of control interfaces. The spiral pump and the sewage discharging assembly are connected with the controller through the control interface, and the controller can control the working states of the sewage discharging assembly and the spiral pump; the screw pump can drive the peak making propeller to rotate, so that water in the oil storage tank rotates to form vortex, oil sediment in the oil storage tank is scoured down and diluted, and the pollution discharge assembly can discharge the diluted oil sediment to the outer side of the oil storage tank through the sediment discharge port. The oil sediment cleaning device can clean oil sediment in a primary tank, a secondary tank and a sewage tank of an oil storage tank of an oil field, water in the oil storage tank is made into vortexes through the peak making propellers to wash the oil sediment, the decontamination work is achieved, and the decontamination efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of storage tank cleaning, in particular to a device for cleaning oil, sand and mud in a storage tank by a screw pump. Background Art

[0002] In the petrochemical industry, finished or semi-finished oil products need to be stored in storage tanks. During the long-term storage process of the storage tanks, impurities, sand grains, soil, heavy metal salts, and heavy oil components such as paraffin and asphaltene in the oil products will settle naturally due to the specific gravity difference and accumulate at the bottom of the oil tank, forming a black and thick colloidal substance layer, which is the bottom sludge of the oil tank. The bottom sludge at the bottom layer increases with the increase of the continuous storage time. Over time, the effective volume of the storage tank is reduced, seriously affecting the storage efficiency of the oil tank, and it must be cleaned regularly.

[0003] At present, the bottom sludge of storage tanks is generally cleaned manually. However, due to the large size of the oil tanks, the labor intensity of the workers is also large; and the interior of the oil tank is filled with flammable crude oil. Therefore, the internal environment of the oil tank is dangerous, and fires or even explosions are likely to occur, seriously threatening the lives of the operators.

[0004] Therefore, it is necessary to design a cleaning device for oilfield storage tanks to solve the deficiencies of the prior art. Summary of the Utility Model

[0005] The utility model provides a device for cleaning oil, sand and mud in a storage tank by a screw pump, which has the effects of safe and reliable cleaning operation and high cleaning efficiency. The specific technical solutions are as follows:

[0006] A device for cleaning oil, sand and mud in a storage tank by a screw pump, which includes a peak-forming component and a blind plate. The peak-forming component can be accommodated in the storage tank; the peak-forming component includes a peak-forming propeller, and the peak-forming propeller is arranged on a frame body; the blind plate is detachably connected to a preset discharge port below the storage tank, and the blind plate is provided with a water inlet, a sand discharge port and a control interface. The water inlet is connected to a water inlet pipe, and the water inlet pipe can convey water into the storage tank. The working state of the peak-forming propeller can be controlled through the control interface, so that the water in the storage tank rotates to form a vortex, thereby flushing and diluting the oil, sand and mud in the storage tank. The diluted oil, sand and mud are discharged to the outside of the storage tank through the sand discharge port.

[0007] Further, the peak-forming propeller is connected to a screw pump, and the screw pump is fixedly arranged on the frame body; the screw pump is connected to a controller through the control interface, and the controller can control the working state of the screw pump; the screw pump can drive the peak-forming propeller to rotate.

[0008] Further, the frame body is arranged on a moving component, and the moving component is connected to the controller through the control interface. The controller can control the movement of the moving component to adjust the angle and position of the peak-forming propeller relative to the storage tank.

[0009] Furthermore, the moving component is a crawler structure.

[0010] Furthermore, a sewage discharge component is provided at one end of the frame away from the screw pump. The sewage discharge component is connected to the sand discharge port and is connected to the controller through a control interface. The controller can control the working state of the sewage discharge component.

[0011] Furthermore, the water inlet pipe includes an outer water inlet pipe and an inner water inlet pipe. The outer water inlet pipe is arranged outside the oil storage tank. One end of the outer water inlet pipe is connected to the water inlet, and the other end is connected to the high-pressure water pump. The inner water inlet pipe is arranged inside the oil storage tank. One end of the inner water inlet pipe is connected to the water inlet, and the other end is connected to the inside of the oil storage tank.

[0012] Furthermore, the inner water inlet pipe is arc-shaped. The bending direction of the inner water inlet pipe is the same as that of the side wall of the oil storage tank, and the water outlet end of the inner water inlet pipe is in the same direction as the water outlet end of the peak-forming propeller.

[0013] Furthermore, a flow guide cover is sleeved outside the peak-forming propeller. Connecting arms are connected to both sides of the flow guide cover, and the connecting arms are fixedly arranged on the frame.

[0014] Furthermore, counterweight components are symmetrically arranged on both sides of the screw pump, and the counterweight components are fixedly arranged on the frame.

[0015] Furthermore, a water circulation mechanism is further included. The water circulation mechanism includes an oil-sand separation tank. The oil-sand separation tank includes a sewage inlet and a clear water outlet. The sewage inlet is connected to the sand discharge port on the blind plate, and the clear water outlet is connected to the water inlet on the blind plate. The sewage with oil and sand discharged from the oil storage tank can be pumped into the oil-sand separation tank for sedimentation and filtration, and then pumped into the oil storage tank through the clear water outlet to continue to wash the oil and sand, so as to realize the recycling of water.

[0016] Furthermore, the sewage inlet and the clear water outlet of the oil-sand separation tank are respectively arranged at the upper positions at both ends of the oil-sand separation tank. A first baffle and a second baffle are vertically arranged at a position close to the sewage inlet in the oil-sand separation tank. A sedimentation chamber is formed between the first baffle and the side wall where the sewage inlet is located. The first baffle is spaced from the bottom of the oil-sand separation tank. A blocking chamber is formed between the first baffle and the second baffle. The second baffle is fixedly connected to the bottom of the oil-sand separation tank. The height of the second baffle is less than the height of the oil-sand separation tank. A clear water chamber is formed between the second baffle and the side wall where the clear water outlet is located. The sedimentation chamber, the blocking chamber and the clear water chamber are connected.

[0017] The structural design of the oil-silt cleaning device for spiral pump type oil storage tanks of the present utility model is ingenious. It can clean the oil-silt in the primary tanks, secondary tanks and sewage tanks of oilfield oil storage tanks. The water in the oil storage tank is made into a vortex by the peak-forming propeller to wash the oil-silt, so as to realize the cleaning work. And it is equipped with a hydraulic slurry pump to discharge the cleaned oil sludge in real time, with high cleaning efficiency. The whole equipment is hydraulically controlled to achieve non-electrified work in the oil storage tank, greatly improving the safety of the cleaning work. It has strong practicability, thorough cleaning and further improved safety.

[0018] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the following specifically illustrates the specific embodiments of the present utility model. Brief Description of the Drawings

[0019] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0020] Figure 1 It is a schematic diagram of the use state of the oil-silt cleaning device for spiral pump type oil storage tanks in Embodiment 1;

[0021] Figure 2 is Figure 1 an enlarged view of part A of

[0022] Figure 3 It is a three-dimensional view of the blind plate of the oil-silt cleaning device for spiral pump type oil storage tanks of the present utility model;

[0023] Figure 4 It is an installation schematic diagram of the peak-forming component and the sewage discharge component of the oil-silt cleaning device for spiral pump type oil storage tanks in Embodiment 1 on the frame Figure 1 ;

[0024] Figure 5 It is an installation schematic diagram of the peak-forming component and the sewage discharge component of the oil-silt cleaning device for spiral pump type oil storage tanks in Embodiment 1 on the frame Figure 2 .

[0025] Figure 6 It is an installation schematic diagram of the peak-forming component and the sewage discharge component of the oil-silt cleaning device for spiral pump type oil storage tanks in Embodiment 2 on the frame;

[0026] Figure 7 It is a structural schematic diagram of the oil-silt cleaning device for spiral pump type oil storage tanks in Embodiment 3;

[0027] Figure 8 It is a schematic structural diagram of the oil-sediment cleaning device of the screw pump type oil storage tank in the fourth embodiment;

[0028] Figure 9 It is a schematic diagram of the use state of the oil-sediment cleaning device of the screw pump type oil storage tank in the fifth embodiment;

[0029] Figure 10 It is a schematic internal structure diagram of the oil-sediment separation tank in the fifth embodiment. Specific embodiments

[0030] In order to better understand the purpose, function and specific design of the present invention, the screw pump type oil storage tank oil-sediment cleaning device of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Embodiment 1

[0032] As Figures 1-5 shown, the screw pump type oil storage tank oil-sediment cleaning device of the present invention includes a peak-forming component 1, a sewage discharge component 2 and a blind plate 3. The peak-forming component 1 and the sewage discharge component 2 can be accommodated in the oil storage tank 8; the peak-forming component 1 includes a peak-forming propeller 11, and the peak-forming propeller 11 is connected to a screw pump 12. The screw pump 12 is fixedly arranged on a frame 4, and a sewage discharge component 2 is arranged at one end of the frame 4 away from the screw pump 12; the blind plate 3 is detachably connected to a preset discharge port below the oil storage tank 8. The blind plate 3 is provided with a water inlet 31, a sand discharge port 32 and a plurality of control interfaces 33. The water inlet 31 is connected to a water inlet pipe, and the water inlet pipe can convey water into the oil storage tank 8. The screw pump 12 and the sewage discharge component 2 are connected to a controller through the control interfaces 33, and the controller can control the working states of the sewage discharge component 2 and the screw pump 12; the screw pump 12 can drive the peak-forming propeller 11 to rotate, so that the water in the oil storage tank 8 rotates to form a vortex, thereby flushing and diluting the oil-sediment in the oil storage tank 8. The sewage discharge component 2 is connected to the sand discharge port 32, and the sewage discharge component 2 can discharge the diluted oil-sediment to the outside of the oil storage tank 8 through the sand discharge port 32.

[0033] Specifically, as Figures 2-3 shown, there is a preset discharge port below the oil storage tank 8 for personnel to enter the interior of the oil storage tank 8, and the blind plate 3 can be made according to the size of the discharge port. When the screw pump type oil storage tank oil-sediment cleaning device of the present invention is in use, first, the peak-forming component 1, the sewage discharge component 2 and the frame 4 are integrally placed in the oil storage tank 8, and then the screw pump 12 and the sewage discharge component 2 are connected to the controller through the control interfaces 33. The sewage discharge component 2 in this embodiment includes a sewage pump 21. The sewage pump 21 is connected to a sewage pipe 22, and the sewage pipe 22 is connected to the sand discharge port 32. The sewage pump 21 can discharge the diluted oil sludge at the bottom of the oil tank to the outside of the oil storage tank 8 through the sand discharge port 32; the sewage pump 21 in this embodiment is an existing hydraulic slurry pump on the market.

[0034] The water inlet pipe includes an outer water inlet pipe and an inner water inlet pipe 5. The outer water inlet pipe is arranged outside the oil storage tank 8. One end of the outer water inlet pipe is connected to the water inlet 31, and the other end is connected to a high-pressure water pump. The inner water inlet pipe 5 is arranged inside the oil storage tank 8. One end of the inner water inlet pipe 5 is connected to the water inlet 31, and the other end is connected to the inside of the oil storage tank 8 to convey water into the oil storage tank 8. Preferably, the inner water inlet pipe 5 is arc-shaped, the bending direction of the inner water inlet pipe 5 is the same as the bending direction of the side wall of the oil storage tank 8, and the water outlet end of the inner water inlet pipe 5 is in the same direction as the water outlet end of the peak-forming propeller 11 to assist the peak-forming propeller 11 in creating a vortex inside the oil storage tank 8.

[0035] It should be noted that due to the relatively large density of the oil-silt, there is less oil-silt above the vortex inside the oil storage tank 8 and more oil-silt below. Therefore, in this embodiment, the water inlet 31 is arranged at a position above the sand discharge port 32, and the sand discharge port 32 is arranged at a position close to the bottom of the oil storage tank 8, so that the clear water enters above the vortex, and the diluted oil-silt below is discharged through the sand discharge port 32.

[0036] Preferably, in order to further improve the ability of the peak-forming propeller 11 to create a vortex, as Figures 4-5 shown, a flow guide cover 13 is sleeved outside the peak-forming propeller 11. The flow guide cover 13 can enable the peak-forming propeller 11 to create a water flow beam to drive the water flow to form a vortex. If the flow guide cover 13 is not provided, water will splash on both sides of the peak-forming propeller 11, resulting in waste of the kinetic energy of the peak-forming propeller 11 and poor effect of creating a vortex. In this embodiment, connecting arms 14 are connected to both sides of the flow guide cover 13, and the connecting arms 14 are fixedly arranged on the frame body 4.

[0037] In order to improve the stability of the spiral pump type oil-silt cleaning device of the utility model during operation, the frame body 4 of this embodiment is a rectangular symmetric structure, and the rotation axes of the spiral pump 12 and the peak-forming propeller 11 are on the same vertical plane as the central axis of the frame body 4, that is, the spiral pump 12 and the peak-forming propeller 11 are arranged at the middle position in the length direction of the frame body 4 to avoid the frame body 4 from tipping over due to uneven force. It should be noted that counterweight components 6 are symmetrically arranged on both sides of the spiral pump 12 in this embodiment. The counterweight components 6 are fixedly arranged on the frame body 4, and the counterweight components 6 can further improve the impact resistance of the spiral pump type oil-silt cleaning device of the utility model.

[0038] To facilitate the movement of the oil-sediment cleaning device of the screw pump type oil storage tank in this embodiment, the frame 4 is arranged on the moving component 7. The moving component 7 can drive the frame 4 and the peak-forming component 1 and the sewage discharging component 2 on the frame 4 to move as a whole, thus reducing the handling difficulty. In addition, the moving component 7 of this embodiment is connected to the controller through the control interface 33, and the controller controls the movement of the moving component 7, so as to realize that the angle and position of the peak-forming propeller 11 relative to the oil storage tank 8 can also be adjusted during use to achieve a better vortex manufacturing effect.

[0039] Preferably, the moving component 7 is a crawler structure. The crawler structure is a prior art and will not be elaborated here. The use of the crawler structure can increase the contact area with the ground and improve stability. At the same time, the weight of the crawler structure is also relatively large, which can further improve the impact resistance of the present invention.

[0040] To facilitate the connection of the water inlet pipe and the sewage discharging pipe 22, connection flanges are provided at the ends of the water inlet 31 and the sand discharging port 32 in this embodiment, and sealing rings are provided on the flanges to improve the connection tightness.

[0041] Embodiment Two

[0042] As Figure 6 shown, the difference between the oil-sediment cleaning device of the screw pump type oil storage tank in this embodiment and that in Embodiment One is that this embodiment is more suitable for the cleaning work of small oil storage tanks. Specifically, the sewage discharging component 2 does not need to be arranged on the frame 4 of the oil-sediment cleaning device of the screw pump type oil storage tank in this embodiment. The frame 4 of this embodiment includes a placement rack 41 and an installation groove 42. The installation groove 42 is U-shaped and is fixedly arranged on the placement rack 41. The peak-forming component 1 is arranged in the installation groove 42. The peak-forming component 1 includes a peak-forming propeller 11, and the peak-forming propeller 11 is connected to the screw pump 12. The peak-forming propeller 11 and the screw pump 12 are respectively fixedly arranged at both ends of the installation groove 42.

[0043] The U-shaped installation groove 42 in this embodiment is matched with the flow guide cover 13, which can better enable the peak-forming propeller 11 to create a water flow beam to drive the water flow to form a vortex, so as to wash down and dilute the oil-sediment in the oil storage tank 8. The diluted oil-sediment can flow out of the oil storage tank 8 through the sand discharging port 32 to the outside of the oil storage tank 8.

[0044] Embodiment Three

[0045] As Figure 7As shown in the figure, the difference between the screw pump type oil-sediment cleaning device of this embodiment and that of the first embodiment is that this embodiment is more suitable for the cleaning work of small oil storage tanks, and is simpler and more convenient to use than the second embodiment. Specifically, the peak screw propeller 11 of the peak forming component 1 of this embodiment is connected to a transmission, and the transmission is arranged on the frame body 4. The frame body 4 is fixed on the blind plate and is connected to the control interface 33. The frame body 4 of this embodiment is a sealed pipe, and a transmission shaft is arranged inside the sealed pipe. One end of the transmission shaft is connected to the transmission, and the other end is connected to the screw pump 12. The screw pump 12 is arranged outside the oil storage tank 8. The transmission shaft is connected to the transmission through the control interface 33 and drives the peak screw propeller 11 to rotate. An inlet 31 is arranged above the blind plate 3, and the inlet 31 is connected to a water inlet pipe. The water inlet pipe can convey water into the oil storage tank 8. A sand discharge port 32 is arranged below the blind plate 3, and the diluted oil-sediment is discharged to the outside of the oil storage tank 8 through the sand discharge port 32.

[0046] Embodiment Four

[0047] As Figure 8 shown in the figure, the difference between the screw pump type oil-sediment cleaning device of this embodiment and that of the third embodiment is that the peak screw propeller 11 is connected to the screw pump 12. The screw pump 12 is arranged on the frame body 4. The frame body 4 is fixed on the blind plate and is connected to the control interface 33. The frame body 4 of this embodiment is a sealed pipe, and a hydraulic pipe is arranged inside the sealed pipe. One end of the hydraulic pipe is connected to the screw pump 12, and the other end is connected to the controller through a quick connector on the blind plate. The controller can control the working state of the screw pump 12; the screw pump 12 can drive the peak forming screw propeller 11 to rotate, so that the water in the oil storage tank 8 rotates to form a vortex, thereby flushing and diluting the oil-sediment in the oil storage tank 8. The diluted oil-sediment is discharged to the outside of the oil storage tank 8 through the sand discharge port 32.

[0048] Embodiment Five

[0049] As Figures 9-10 shown in the figure, the screw pump type oil-sediment cleaning device of this embodiment is added with a water circulation mechanism on the basis of the first embodiment or the second embodiment or the third embodiment. The water circulation mechanism includes an oil-sediment separation tank 9. The oil-sediment separation tank 9 includes a sewage inlet 91, a clear water outlet 92 and a sediment outlet 93. The sewage inlet 91 is connected to the sand discharge port 32 on the blind plate 3, and the clear water outlet 92 is connected to the water inlet 31 on the blind plate 3. The sewage with oil-sediment discharged from the oil storage tank 8 can be pumped into the oil-sediment separation tank 9 for sedimentation and filtration, and then pumped into the oil storage tank 8 through the clear water outlet 92 to continue to wash and flush the oil-sediment, so as to realize the recycling of water. When the oil-sediment deposited in the oil-sediment separation tank 9 is too much, the sediment outlet 93 can be opened to discharge the oil-sediment deposited in the oil-sediment separation tank 9.

[0050] Specifically, the sewage inlet 91 and the clean water outlet 92 of the oil-silt separation tank 9 are respectively arranged at the upper positions at both ends of the oil-silt separation tank 9, and the sediment outlet 93 is arranged at the lower position on the same side as the sewage inlet 91. A first baffle 95 and a second baffle 96 are vertically arranged at a position in the oil-silt separation tank 9 close to the sewage inlet 91. A sedimentation chamber 97 is formed between the first baffle 95 and the side wall where the sewage inlet 91 is located. The first baffle 95 is spaced from the bottom of the oil-silt separation tank 9. A blocking chamber 98 is formed between the first baffle 95 and the second baffle 96. The second baffle 96 is fixedly connected to the bottom of the oil-silt separation tank 9. The height of the second baffle 96 is less than the height of the oil-silt separation tank 9. A clean water chamber 99 is formed between the second baffle 96 and the side wall where the clean water outlet 92 is located. The sedimentation chamber 97, the blocking chamber 98 and the clean water chamber 99 are connected. The sewage with oil and silt discharged from the storage oil tank 8 is first pumped into the sedimentation chamber 97 for sedimentation. Then, the oil and silt settle to the bottom of the oil-silt separation tank 9 and are blocked by the second baffle 96. Then, the upper clean water can flow into the clean water chamber 99 through the upper part of the second baffle 96 for standby.

[0051] Preferably, a clean water outlet 94 is further arranged at the bottom of the clean water chamber 99 to facilitate the discharge of the water in the clean water chamber.

[0052] The structure of the screw pump type oil-silt cleaning device of the utility model is ingeniously designed. It can clean the oil and silt in the primary tank, secondary tank and sewage tank of the oilfield storage tank. The water in the storage tank is made into a vortex by the peak-forming propeller to wash the oil and silt to realize the cleaning work. And it is equipped with a hydraulic slurry pump to discharge the cleaned oil sludge in real time, with high cleaning efficiency. The whole device is hydraulically controlled to realize non-electrified work in the storage tank, greatly improving the safety of the cleaning work. It has strong practicability, thorough cleaning and further improved safety.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for cleaning oil and sediment in a storage oil tank of a screw pump type, characterized in that, It includes a peak-forming component and a blind plate. The peak-forming component can be accommodated in an oil storage tank. The peak-forming component includes a peak-forming propeller, and the peak-forming propeller is arranged on a frame. The blind plate is detachably connected to a preset discharge port below the oil storage tank. The blind plate is provided with a water inlet, a sand discharge port and a control interface. The water inlet is connected to a water inlet pipe, and the water inlet pipe can convey water into the oil storage tank. The working state of the peak-forming propeller can be controlled through the control interface, so that the water in the oil storage tank rotates to form a vortex, thereby flushing and diluting the oil sediment in the oil storage tank, and the diluted oil sediment is discharged to the outside of the oil storage tank through the sand discharge port.

2. The screw pump type oil and sediment cleaning device for an oil storage tank according to claim 1, wherein The peak-forming propeller is connected to a screw pump, and the screw pump is fixedly arranged on the frame. The screw pump is connected to a controller through the control interface, and the controller can control the working state of the screw pump. The screw pump can drive the peak-forming propeller to rotate.

3. The screw pump type oil and sediment cleaning device for oil storage tanks according to claim 2, characterized in that, The frame is arranged on a moving component, and the moving component is connected to the controller through the control interface. The controller can control the movement of the moving component to adjust the angle and position of the peak-forming propeller relative to the oil storage tank.

4. The spiral pump type oil and sediment cleaning device for oil storage tanks according to claim 2, characterized in that, A sewage discharge component is arranged at one end of the frame far from the screw pump. The sewage discharge component is connected to the sand discharge port, and the sewage discharge component is connected to the controller through the control interface. The controller can control the working state of the sewage discharge component.

5. The screw pump type oil and sediment cleaning device for oil storage tanks according to claim 2, characterized in that, The water inlet pipe includes an outer water inlet pipe and an inner water inlet pipe. The outer water inlet pipe is arranged outside the oil storage tank. One end of the outer water inlet pipe is connected to the water inlet, and the other end is connected to a high-pressure water pump. The inner water inlet pipe is arranged inside the oil storage tank. One end of the inner water inlet pipe is connected to the water inlet, and the other end is connected to the inside of the oil storage tank.

6. The spiral pump type oil and sediment cleaning device for oil storage tanks according to claim 5, characterized in that, The inner water inlet pipe is arc-shaped, the bending direction of the inner water inlet pipe is the same as the bending direction of the side wall of the oil storage tank, and the water outlet end of the inner water inlet pipe is in the same direction as the water outlet end of the peak-forming propeller.

7. The screw pump type oil sediment cleaning device for an oil storage tank according to claim 2, characterized in that, A flow guide cover is sleeved outside the peak-forming propeller, and connecting arms are connected to both sides of the flow guide cover. The connecting arms are fixedly arranged on the frame.

8. The screw pump type oil-sediment cleaning device for an oil storage tank according to claim 2, characterized in that, Counterweight components are symmetrically arranged on both sides of the screw pump. The counterweight components are fixedly arranged on the frame.

9. The spiral pump type oil and sediment cleaning device for oil storage tanks according to claim 1, wherein, It also includes a water circulation mechanism. The water circulation mechanism includes an oil sediment separation tank. The oil sediment separation tank includes a sewage inlet and a clear water outlet. The sewage inlet is connected to the sand discharge port on the blind plate, and the clear water outlet is connected to the water inlet on the blind plate. The sewage with oil sediment discharged from the oil storage tank can be pumped into the oil sediment separation tank for sedimentation and filtration, and then pumped into the oil storage tank through the clear water outlet to continue to wash and flush the oil sediment, so as to realize the recycling of water.

10. The spiral pump type oil and sediment cleaning device for oil storage tanks according to claim 9, characterized in that, The sewage inlet and the clear water outlet of the oil sediment separation tank are respectively arranged at the upper positions at both ends of the oil sediment separation tank. A first baffle and a second baffle are vertically arranged at a position close to the sewage inlet in the oil sediment separation tank. A sedimentation chamber is formed between the first baffle and the side wall where the sewage inlet is located. The first baffle is spaced from the bottom of the oil sediment separation tank. A blocking chamber is formed between the first baffle and the second baffle. The second baffle is fixedly connected to the bottom of the oil sediment separation tank. The height of the second baffle is less than the height of the oil sediment separation tank. A clear water chamber is formed between the second baffle and the side wall where the clear water outlet is located. The sedimentation chamber, the blocking chamber and the clear water chamber are connected.

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