Cleaning equipment and cleaning process for oil tank

Abstract

The invention relates to the technical field of cleaning equipment, in particular to cleaning equipment and a cleaning process for an oil tank. Cleaning equipment for an oil tank comprises a spraying barrel and an adjusting barrel. The spraying barrel is arranged in the vertical direction and can be installed in the oil tank in the mode of rotating around the axis of the spraying barrel. An upper opening, a middle opening and a lower opening which are sequentially formed in the vertical direction are formed in the spraying barrel. The adjusting cylinder is arranged in the vertical direction and installed on the spraying cylinder. An upper outlet and a lower outlet are formed in the adjusting cylinder, and the adjusting cylinder can rotate around the axis of the adjusting cylinder relative to the spraying cylinder. According to the cleaning equipment for the oil tank, through cooperation of the spraying barrel and the adjusting barrel, the interior of the oil tank can be comprehensively cleaned, the spraying area can be flexibly adjusted according to actual distribution of oil sludge, the oil sludge stripping capacity is improved, and the cleaning effect of the oil tank is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cleaning equipment, and particularly to a cleaning equipment and cleaning process for oil tanks. Background Art

[0002] After long-term use, sludge, residual media and other dirt will adhere to the inner wall of the oil tank. If not cleaned in time, problems such as oil product pollution, oil tank corrosion, measurement error, etc. may occur, and even lead to safety accidents. Therefore, after the oil tank in the prior art is used, the dirty oil sludge inside the oil tank is usually pumped out first, and mechanical tank cleaning is carried out on the oil tank. Then, the remaining dirty oil sludge in the oil tank is further cleaned. Currently, the cleaning of oil tanks mainly relies on the spray ball structure, and its core principle is to peel off dirt through the impact force generated by high-pressure liquid spraying, which is mainly divided into two categories: fixed spray balls and rotating spray balls.

[0003] Among them, the fixed spray ball sprays high-pressure water flow in a specific direction through a fixed nozzle. Its structure is simple, the cost is low, and the requirements for the pressure and flow rate of the cleaning system are relatively low. However, the impact force of the fixed spray ball is relatively weak, and more water and cleaning agents may be required to achieve the same cleaning effect when facing stubborn stains, which may lead to waste of water resources in some cases.

[0004] The rotating spray ball has a stronger impact force through a dynamic spraying trajectory, and can effectively remove those difficult-to-remove dirt, representing the mainstream technical direction of current oil tank cleaning. This design not only improves the cleaning efficiency, but also can reduce the usage amount of water and cleaning agents to a certain extent, thereby saving resources. In addition, due to its movement characteristics during the cleaning process, the rotating spray ball can also promote the circulation and flow of the liquid, further improving the cleaning effect. However, a single rotating spray ball cannot adjust the cleaning area according to the distribution difference of the dirt on the inner wall of the oil tank, affecting the use effect. And configuring multiple sets of rotating spray balls to respectively achieve the overall cleaning of the upper, middle and lower parts of the oil tank, or the specific cleaning of the upper and inner parts, lower and inner parts of the oil tank, although it can solve the need for cleaning specific areas, this configuration method still has problems such as complex installation and debugging, and high maintenance and repair costs. Summary of the Invention

[0005] The present invention provides a cleaning equipment and cleaning process for oil tanks to solve the problem that the existing rotating spray balls cannot adjust the cleaning area according to the distribution difference of the dirt on the inner wall of the oil tank, resulting in unsatisfactory use effects.

[0006] The present invention provides a cleaning device for an oil tank, adopting the following technical solution: A cleaning device for an oil tank includes a spray cylinder and an adjustment cylinder. The spray cylinder is arranged vertically and is rotatably installed in the oil tank around its own axis; an upper opening, a middle opening, and a lower opening are successively arranged on the spray cylinder in the vertical direction; the upper opening faces upward, the middle opening is horizontal, and the lower opening faces downward; the adjustment cylinder is arranged vertically and installed on the spray cylinder. The adjustment cylinder is provided with an upper outlet and a lower outlet. The adjustment cylinder can rotate relative to the spray cylinder around its own axis, and the rotation of the adjustment cylinder can make the upper outlet communicate with the upper opening and / or the lower outlet communicate with the lower opening.

[0007] Further, the adjustment cylinder includes an upper cylinder section and a lower cylinder section. The upper cylinder section is located above the lower cylinder section; both the upper cylinder section and the lower cylinder section cover the spray cylinder and can respectively rotate relative to the spray cylinder around their own axes; the upper outlet is opened on the upper cylinder section, and the lower outlet is opened on the lower cylinder section.

[0008] Further, the middle opening is inclined with respect to the radial direction of the spray cylinder.

[0009] Further, the adjustment cylinder further includes a middle cylinder section. The middle cylinder section is a tubular structure that is vertically through. The middle cylinder section is sleeved with the spray cylinder, and in the vertical direction, the middle cylinder section is located between the upper cylinder section and the lower cylinder section. Both the upper cylinder section and the lower cylinder section are respectively rotationally matched with the middle cylinder section; a middle outlet is opened on the middle cylinder section. The middle outlet is inclined in the radial direction of the spray cylinder and always communicates with the middle opening, and the inclination direction of the middle outlet is the same as the inclination direction of the middle opening.

[0010] Further, a water pipe is detachably installed on the oil tank. The spray cylinder is installed on the water pipe through a connecting cylinder. The connecting cylinder is coaxial with the spray cylinder and can communicate with the spray cylinder.

[0011] Further, the connecting cylinder is detachably connected to the water pipe.

[0012] Further, the spray cylinder is rotatably installed at one end of the connecting cylinder away from the water pipe through a rotating cylinder; the rotating cylinder is rotationally matched with the connecting cylinder through balls. The rotating cylinder is coaxial with the spray cylinder and communicates with the spray cylinder; a water inlet is opened on the circumferential wall surface of the rotating cylinder, and water can sequentially pass through the balls and the water inlet in the radial direction of the rotating cylinder.

[0013] Further, a cover plate is coaxially arranged at one end of the rotating cylinder away from the spray cylinder. The outer circumferential wall surface of the cover plate abuts against the inner circumferential wall surface of the connecting cylinder. A plurality of water passing openings are opened on the cover plate. The plurality of water passing openings are evenly distributed on the cover plate around the axis of the rotating cylinder. The water passing openings, the balls, and the water inlet are sequentially arranged in the radial direction of the rotating cylinder, and the water inlet is located on the side of the balls closer to the axis of the rotating cylinder in the radial direction of the rotating cylinder.

[0014] Further, a pressure regulating cylinder is arranged between the cover plate and the rotating cylinder, and a gap allowing water flow to pass through is defined between the pressure regulating cylinder and the rotating cylinder; a pressure relief valve is connected to the pressure regulating cylinder.

[0015] The present invention also provides a cleaning process for an oil tank, which uses the above-mentioned cleaning equipment for an oil tank and includes the following steps: S10, driving the adjusting cylinder to rotate relative to the spraying cylinder around its own axis so that the upper outlet communicates with the upper opening and / or the lower outlet communicates with the lower opening; S20, introducing water into the spraying cylinder and making the spraying cylinder rotate self - rotatably.

[0016] The beneficial effects of the present invention are as follows: The cleaning equipment for an oil tank of the present invention is provided with a spraying cylinder and an adjusting cylinder in cooperation. During use, the adjusting cylinder rotates relative to the spraying cylinder. When the upper outlet and the upper opening, and the lower outlet and the lower opening are synchronously communicated, water can be sprayed upward, horizontally, and downward respectively to clean the inner top wall, inner peripheral wall, and inner bottom wall of the oil tank in the whole area. When only the upper and middle parts or the middle and lower parts of the oil tank need to be cleaned, the upper outlet can also be separately communicated with the upper opening or the lower outlet can be separately communicated with the lower opening. It can not only clean the inside of the oil tank comprehensively, but also flexibly adjust the spraying area according to the actual distribution of the oily sludge, increase the stripping ability of the oily sludge, and improve the cleaning effect of the oil tank. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the cleaning mechanism of an embodiment of the cleaning equipment for an oil tank of the present invention installed in an oil tank; Figure 2 It is a front view of the cleaning mechanism of an embodiment of the cleaning equipment for an oil tank of the present invention installed in an oil tank; Figure 3 For Figure 2 the cross - sectional view along A - A in Figure 4 It is a schematic diagram of the cleaning mechanism of an embodiment of the cleaning equipment for an oil tank of the present invention; Figure 5 It is a front view of the cleaning mechanism of an embodiment of the cleaning equipment for an oil tank of the present invention; Figure 6 For Figure 5 the cross - sectional view along B - B in Figure 7 is Figure 5 A cross-sectional view along C-C in Figure 8 is Figure 7 An enlarged view at D in Figure 9 A side view of the cleaning mechanism of an embodiment of a cleaning device for an oil tank according to the present invention; Figure 10 is Figure 9 A cross-sectional view along E-E in Figure 11 is Figure 10 An enlarged view at F in

[0019] In the figure: 100, oil tank; 101, oil inlet; 102, oil outlet; 103, support leg; 110, water pipe; 120, connecting flange; 200, cleaning mechanism; 210, spray cylinder; 211, upper opening; 212, middle opening; 213, lower opening; 220, adjusting cylinder; 221, upper outlet; 222, lower outlet; 223, upper cylinder section; 224, lower cylinder section; 225, first connecting piece; 226, second connecting piece; 227, middle cylinder section; 228, third connecting piece; 229, middle outlet; 230, connecting cylinder; 240, rotating cylinder; 241, fourth connecting piece; 242, water inlet; 250, ball; 260, cover plate; 261, bolt; 262, water passing port; 270, pressure regulating cylinder; 280, pressure relief valve. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] The present invention provides an embodiment of a cleaning device for an oil tank, as Figures 1 to 11 shown.

[0022] A cleaning device for an oil tank, used to clean the inner wall surface of the oil tank 100. An oil inlet 101 and an oil outlet 102 are provided on the oil tank 100. Legs 103 for supporting the oil tank 100 are provided at the lower end of the oil tank 100, including a cleaning mechanism 200. The cleaning mechanism 200 includes a spray cylinder 210 and an adjustment cylinder 220. The spray cylinder 210 is of a spherical structure. The spray cylinder 210 is arranged vertically and is rotatably installed in the oil tank 100 about its own axis. An upper opening 211, a middle opening 212 and a lower opening 213 are provided on the spray cylinder 210 in sequence along the vertical direction. The upper opening 211 faces upward, the middle opening 212 is arranged horizontally, and the lower opening 213 faces downward.

[0023] The adjustment cylinder 220 is arranged vertically and installed on the spray cylinder 210. An upper outlet 221 and a lower outlet 222 are provided on the adjustment cylinder 220. The adjustment cylinder 220 can rotate relative to the spray cylinder 210 about the vertical direction, and the rotation of the adjustment cylinder 220 can make the upper outlet 221 communicate with the upper opening 211 and / or the lower outlet 222 communicate with the lower opening 213.

[0024] Among them, at least two upper openings 211, middle openings 212 and lower openings 213 are provided, preferably two. The number of upper outlets 221 corresponds to the number of upper openings 211, and the number of lower outlets 222 corresponds to the number of lower openings 213.

[0025] In this embodiment, by setting the cooperation of the spray cylinder 210 and the adjustment cylinder 220, after the oil tank 100 is used, the dirty oil sludge inside the oil tank 100 is first pumped out, and the oil tank 100 is mechanically cleaned, and then the remaining dirty oil sludge in the oil tank 100 is further cleaned.

[0026] If the upper, middle and lower parts of the oil tank 100 all need to be cleaned, the adjustment cylinder 220 is rotated relative to the spray cylinder 210 to make the upper outlet 221 communicate with the upper opening 211, and at the same time make the lower outlet 222 communicate with the lower opening 213. Then water is introduced into the spray cylinder 210, and the spray cylinder 210 is driven to rotate self - sufficiently. The water will flow to the upper opening 211, the middle opening 212 and the lower opening 213 respectively. The water flowing through the upper opening 211 will be sprayed upward from the upper opening 211 through the upper outlet 221 and spray onto the inner top wall of the oil tank 100 in a rotating form to peel off the dirty oil sludge on the inner top wall of the oil tank 100. The water flowing through the middle opening 212 will be sprayed horizontally and spray onto the inner peripheral wall of the oil tank 100 in a rotating form to peel off the dirty oil sludge on the inner peripheral wall of the oil tank 100. The water flowing through the lower opening 213 will be sprayed downward from the lower opening 213 through the lower outlet 222 and spray onto the inner bottom wall of the oil tank 100 in a rotating form to peel off the dirty oil sludge on the inner bottom wall of the oil tank 100.

[0027] If only the upper and middle parts of the oil tank 100 need to be cleaned intensively, or the middle and lower parts need to be cleaned intensively, then rotate the adjusting cylinder 220 relative to the spraying cylinder 210 so that only the upper outlet 221 communicates with the upper opening 211, or only the lower outlet 222 communicates with the lower opening 213, concentrating the pressure of the water flow. Taking the communication between the upper outlet 221 and the upper opening 211 as an example, since the lower outlet 222 and the lower opening 213 do not communicate at this time, when water enters the spraying cylinder 210, the water will only be diverted from the upper opening 211 and the middle opening 212. Similarly, the water flowing through the upper opening 211 will be sprayed upward from the upper opening 211 through the upper outlet 221 onto the inner top wall of the oil tank 100, and the water flowing through the middle opening 212 will be sprayed horizontally onto the inner peripheral wall of the oil tank 100, stripping the dirty oil sludge on the inner peripheral wall of the oil tank 100, and at this time, the water pressure sprayed from the upper outlet 221 and the middle opening 212 is relatively greater, achieving a better cleaning effect.

[0028] That is, by rotating the adjusting cylinder 220 relative to the spraying cylinder 210, when the upper outlet 221 communicates with the upper opening 211 and the lower outlet 222 communicates with the lower opening 213 synchronously, the water flow can be sprayed upward, horizontally and downward respectively to clean the entire area of the inner top wall, inner peripheral wall and inner bottom wall of the oil tank 100. When only the upper and middle parts or the middle and lower parts of the oil tank 100 need to be cleaned, the upper outlet 221 can also be separately connected to the upper opening 211 or the lower outlet 222 to the lower opening 213, which can not only clean the inside of the oil tank 100 comprehensively, but also flexibly adjust the spraying area according to the actual distribution of the dirty oil sludge, increasing the stripping ability of the dirty oil sludge and improving the cleaning effect of the oil tank 100.

[0029] In a further embodiment, the adjusting cylinder 220 includes an upper cylinder section 223 and a lower cylinder section 224. Both the upper cylinder section 223 and the lower cylinder section 224 are hemispherical shell structures, and the upper cylinder section 223 is located above the lower cylinder section 224. Both the upper cylinder section 223 and the lower cylinder section 224 cover the spraying cylinder 210 and can rotate relative to the spraying cylinder 210 around their own axes respectively. The upper outlet 221 is opened on the upper cylinder section 223, and the lower outlet 222 is opened on the lower cylinder section 224.

[0030] Specifically, the upper cylinder section 223 covers the spraying cylinder 210 through a first connecting member 225, and the lower cylinder section 224 covers the spraying cylinder 210 through a second connecting member 226.

[0031] Among them, the first connecting member 225 includes a first limit pin. The first limit pin passes through the upper cylinder section 223 and abuts against the spraying cylinder 210, and the first limit pin is screwed to the upper cylinder section 223. Thus, when the first limit pin connects the upper cylinder section 223 and the spraying cylinder 210, the first limit pin will limit the rotation of the upper cylinder section 223 relative to the spraying cylinder 210 around the vertical direction through friction.

[0032] The second connecting member 226 includes a second limiting pin. The second limiting pin passes through the lower cylinder section 224 and abuts against the spray cylinder 210, and the second limiting pin is screwed to the lower cylinder section 224. Thus, when the second limiting pin connects the lower cylinder section 224 and the spray cylinder 210, the second limiting pin will restrict the rotation of the lower cylinder section 224 relative to the spray cylinder 210 around the vertical direction through friction.

[0033] In this embodiment, by providing the upper cylinder section 223 and the lower cylinder section 224, before cleaning, the operator manually rotates and adjusts the upper cylinder section 223 and the lower cylinder section 224 according to the area to be cleaned in the oil tank 100. That is, when it is necessary to comprehensively clean the upper, middle, and lower parts of the oil tank 100, the upper outlet 221 on the upper cylinder section 223 is communicated with the upper opening 211 on the spray cylinder 210, and at the same time, the lower outlet 222 on the lower cylinder section 224 is communicated with the lower opening 213 on the spray cylinder 210. When only the upper and middle parts of the oil tank 100 need to be cleaned, only the upper outlet 221 on the upper cylinder section 223 is communicated with the upper opening 211 on the spray cylinder 210, and the lower outlet 222 on the lower cylinder section 224 is misaligned with the lower opening 213 on the spray cylinder 210 and is no longer communicated. Then, the upper cylinder section 223 and the spray cylinder 210 are connected by using the first limiting pin, and the lower cylinder section 224 and the spray cylinder 210 are connected by using the second limiting pin, so that when cleaning, both the upper cylinder section 223 and the lower cylinder section 224 can rotate synchronously with the spray cylinder 210.

[0034] In a further embodiment, the middle opening 212 is inclined radially with respect to the spray cylinder 210.

[0035] In the same setting manner as the prior art, in this embodiment, by making the middle opening 212 inclined radially with respect to the spray cylinder 210, when high-pressure water enters the spray cylinder 210, the water flowing out from the middle opening 212 will cause the entire spray cylinder 210 to rotate self - clockwise. See Figure 7 As shown, at this time, the spray cylinder 210 rotates clockwise from the perspective shown in the figure.

[0036] Furthermore, the adjusting cylinder 220 further includes a middle cylinder section 227. The middle cylinder section 227 is a tubular structure that penetrates up and down. The middle cylinder section 227 is sleeved with the spray cylinder 210 through a third connecting member 228. And in the vertical direction, the middle cylinder section 227 is located between the upper cylinder section 223 and the lower cylinder section 224. Both the upper cylinder section 223 and the lower cylinder section 224 are respectively rotationally matched with the middle cylinder section 227. A middle outlet 229 is provided on the middle cylinder section 227. The middle outlet 229 is inclined in the radial direction of the spray cylinder 210 and is always communicated with the middle opening 212, and the inclination direction of the middle outlet 229 is the same as the inclination direction of the middle opening 212.

[0037] Among them, the number of middle outlets 229 corresponds to the number of middle openings 212. The third connecting member 228 includes a third limit pin. The third limit pin passes through the middle cylinder section 227 and abuts against the spray cylinder 210, and the third limit pin is screwed to the middle cylinder section 227. Thus, when the third limit pin connects the middle cylinder section 227 and the spray cylinder 210, the third limit pin will restrict the rotation of the middle cylinder section 227 relative to the spray cylinder 210 around the vertical direction by friction. The third limit pin in this embodiment is not disassembled unless necessary after installation.

[0038] Specifically, the middle cylinder section 227 and the upper cylinder section 223 are connected by a first pin, and the middle cylinder section 227 and the lower cylinder section 224 are connected by a second pin. A first annular groove is formed on the upper cylinder section 223, and the first pin passes through the middle cylinder section 227 and then is inserted into the first annular groove. A second annular groove is formed on the lower cylinder section 224, and the second pin passes through the middle cylinder section 227 and then is inserted into the second annular groove.

[0039] In a further embodiment, a water pipe 110 is detachably installed on the oil tank 100. The spray cylinder 210 is installed on the water pipe 110 through a connecting cylinder 230. The connecting cylinder 230 is coaxial with the spray cylinder 210 and can communicate with the spray cylinder 210.

[0040] Among them, the water pipe 110 is installed on the oil tank 100 through a connecting flange 120. A top cover is connected to the oil tank 100. When the oil tank 100 needs to be cleaned, first remove the top cover, then install the water pipe 110 on the oil tank 100 through the connecting flange 120, and externally connect a water pump to supply water to the water pipe 110.

[0041] Further, the upper end of the connecting cylinder 230 is detachably connected to the water pipe 110. Specifically, the connecting cylinder 230 is screwed to the water pipe 110. Alternatively, the connecting cylinder 230 is snap-connected to the water pipe 110.

[0042] In a further embodiment, the spray cylinder 210 is rotatably installed at one end of the connecting cylinder 230 away from the water pipe 110 through a rotating cylinder 240. That is, the lower end of the connecting cylinder 230. The rotating cylinder 240 is rotatably matched with the connecting cylinder 230 through balls 250. The rotating cylinder 240 is coaxial with the spray cylinder 210 and communicates with the spray cylinder 210. A water inlet 242 is formed on the circumferential wall surface of the rotating cylinder 240, and water can sequentially pass through the balls 250 and the water inlet 242 along the radial direction of the rotating cylinder 240.

[0043] Among them, the lower end of the rotating cylinder 240 is screwed to the spray cylinder 210 and locked by a fourth connecting member 241. The fourth connecting member 241 includes a fourth limit pin. The fourth limit pin passes through the spray cylinder 210 and abuts against the connecting cylinder 230, and the fourth limit pin is screwed to the spray cylinder 210. Thus, when the fourth limit pin connects the spray cylinder 210 and the connecting cylinder 230, the fourth limit pin will restrict the relative rotation of the spray cylinder 210 and the connecting cylinder 230 by friction.

[0044] Specifically, a cover plate 260 is provided at one end (the upper end) of the rotating cylinder 240 away from the spraying cylinder 210. The cover plate 260 is coaxial with the rotating cylinder 240, and the cover plate 260 is installed in the connecting cylinder 230 through bolts 261. The diameter of the cover plate 260 is larger than that of the rotating cylinder 240. The outer peripheral wall surface of the cover plate 260 abuts against the inner peripheral wall surface of the connecting cylinder 230. A plurality of water passing holes 262 are formed in the cover plate 260, and the plurality of water passing holes 262 are evenly distributed around the axis of the rotating cylinder 240 on the cover plate 260. The water passing holes 262, the balls 250, and the water inlet 242 are arranged in sequence in the radial direction of the rotating cylinder 240, and the water inlet 242 is located on one side of the balls 250 closer to the axis of the rotating cylinder 240 in the radial direction of the rotating cylinder 240.

[0045] In this embodiment, by providing the rotating cylinder 240 and the balls 250, after water enters the connecting cylinder 230, the water will flow downward from the water passing holes 262 through the balls 250 to the water inlet 242, and finally enter the spraying cylinder 210 from the water inlet 242. And by making the water flow into the rotating cylinder 240 along the radial direction of the rotating cylinder 240 through the balls 250, when the water passes through the balls 250, an upward acting force can be applied to the rotating cylinder 240 by using the water pressure, sharing the pressure acting on the balls 250 by the rotating cylinder 240, the spraying cylinder 210, and the adjusting cylinder 220, and reducing the wear degree of the balls 250.

[0046] In another possible embodiment, a pressure regulating cylinder 270 is provided between the cover plate 260 and the rotating cylinder 240. The pressure regulating cylinder 270 is fixedly connected to the cover plate 260 and is an integrally formed structure. The pressure regulating cylinder 270 is placed on the rotating cylinder 240, and a gap allowing water to pass through is defined between the pressure regulating cylinder 270 and the rotating cylinder 240. A pressure relief valve 280 is connected to the pressure regulating cylinder 270.

[0047] After the water passes through the water passing holes 262, the water will enter the pressure regulating cylinder 270 through the gap between the pressure regulating cylinder 270 and the rotating cylinder 240. Suppose when the pressure regulating cylinder 270 is filled with water, the water pressure inside it is the first preset value, and the pressure relief valve 280 can be started when the water pressure in the pressure regulating cylinder 270 is greater than the second preset value to discharge and relieve the pressure of the water.

[0048] That is, after the inner cavity of the adjusting cylinder 220 is filled with water, the water pressure will act on the balls 250 through the rotating cylinder 240. Therefore, by setting the water pressure in the pressure regulating cylinder 270 to start relieving pressure before reaching the first preset value, the water pressure in the pressure regulating cylinder 270 is always less than the first preset value, adjusting the pressure between the rotating cylinder 240 and the balls 250, and further restricting the rotation speed of the spraying cylinder 210 to avoid the spraying cylinder 210 rotating too fast.

[0049] Alternatively, when the upper outlet 221 communicates with the upper opening 211 and the lower outlet 222 communicates with the lower opening 213, the pressure relief valve 280 can be activated when the water pressure in the pressure regulating cylinder 270 is greater than the second preset value to discharge the water for pressure relief. When the upper outlet 221 communicates with the upper opening 211 or the lower outlet 222 communicates with the lower opening 213, at this time, the pressure relief valve 280 can be activated when the water pressure in the pressure regulating cylinder 270 is greater than the third preset value to discharge the water for pressure relief, and the first preset value is greater than the third preset value, and the third preset value is greater than the second preset value.

[0050] This setting is because when the oil tank 100 is locally cleaned, due to the concentrated pressure of the water flow, the pressure of the water flow when discharging from the middle opening 212 through the middle outlet 229 will also increase, and the rotation speed of the spray cylinder 210 will also become faster. At this time, the water pressure inside the pressure regulating cylinder 270 is increased through the pressure relief valve 280, the pressure between the ball 250 and the rotating cylinder 240 is increased, and the rotation speeds of the rotating cylinder 240 and the spray cylinder 210 are controlled to prevent the spray cylinder 210 from rotating too fast and causing a decline in the cleaning effect. And even if the water pressure in the pressure regulating cylinder 270 increases from the second preset value to the third preset value, since the third preset value is less than the first preset value, that is, the water pressure in the pressure regulating cylinder 270 after adjustment is still less than the water pressure inside the pressure regulating cylinder 270 when it is full of water. Combining the above embodiments, the specific working process is as follows: After the oil tank 100 is used, the flowing oil products in the oil tank 100 need to be transferred to the recovery tank first, and then mechanical tank cleaning is carried out. The specific process is as follows: Select the same crude oil as the oil product in the oil tank 100 as the cleaning oil and operate according to the homogeneous oil circulation cleaning process in the existing mechanical tank cleaning. That is, after the cleaning machine is heated and pressurized, the cleaning operation starts, and the solid oil sludge inside the oil tank 100 is crushed and dissolved to make it have better fluidity. At the same time, a pipeline is led out from the outlet of the cleaning machine, and part of the homogeneous oil is sent to the first-stage separation skid of the three-phase separation equipment. The horizontal centrifuge in the first-stage separation skid preliminarily removes the solid residues in the dirty oil. The solid residue phase is directly bagged and transported out, and the liquid-phase oil is sent back to the homogeneous oil circulation pipeline. And to ensure safety, nitrogen needs to be filled into the oil tank 100 and the oxygen content is monitored.

[0051] After the homogeneous oil cleaning is completed, most of the deposits including solid residues in the oil tank 100 have been removed. Then operate according to the circulating water cleaning process in the traditional mechanical tank cleaning. That is, the inside of the oil tank 100 is cleaned with hot water. The cleaned water can be recycled. The oil and water are separated by an oil-water separation tank. The oil is sent to the recovery tank, and the water is heated and pressurized again and sent to the cleaning machine to clean the oil tank 100. When the oil separation effect in the oil-water separation tank does not meet the standard, the three-phase separation equipment can be started for collaborative treatment, and finally the circulating water cleaning is completed.

[0052] Afterwards, the dirty oil in the oil tank 100 is sent into the hydrocyclone. Under the action of centrifugal force, the solid particles with a larger density are thrown towards the outer wall of the hydrocyclone and gradually move downward, being discharged from the bottom, while the mixture of oil and water is discharged from the overflow port and enters the subsequent three-phase separator or other separation equipment for further oil-water separation. Alternatively, separation can also be directly carried out through the three-phase separator.

[0053] Then, the remaining dirty oil sludge in the oil tank 100 is further cleaned. Before cleaning, the operator manually rotates and adjusts the upper cylinder section 223 and the lower cylinder section 224 according to the area to be cleaned in the oil tank 100.

[0054] That is, when the upper, middle, and lower parts of the oil tank 100 need to be comprehensively cleaned, the upper outlet 221 on the upper cylinder section 223 is connected to the upper opening 211 on the spray cylinder 210, and at the same time, the lower outlet 222 on the lower cylinder section 224 is connected to the lower opening 213 on the spray cylinder 210. When only the upper and middle parts of the oil tank 100 need to be cleaned, only the upper outlet 221 on the upper cylinder section 223 is connected to the upper opening 211 on the spray cylinder 210, and the lower outlet 222 on the lower cylinder section 224 is misaligned with the lower opening 213 on the spray cylinder 210 and is no longer connected. Then, the upper cylinder section 223 and the spray cylinder 210 are connected by using the first limit pin, and the lower cylinder section 224 and the spray cylinder 210 are connected by using the second limit pin.

[0055] Then, the water pipe 110 is installed on the oil tank 100 through the connecting flange 120, and an external water pump is connected to supply water to the water pipe 110. When water enters the connecting cylinder 230 through the water pipe 110, the water will flow downward from the water passing port 262 through the ball 250 to the water inlet 242, and finally enter the spray cylinder 210 from the water inlet 242.

[0056] Taking the upper outlet 221 on the upper cylinder section 223 being connected to the upper opening 211 on the spray cylinder 210 and the lower outlet 222 on the lower cylinder section 224 being connected to the lower opening 213 on the spray cylinder 210 as an example. After water enters the spray cylinder 210, it will flow to the upper opening 211, the middle opening 212, and the lower opening 213 respectively. The water flowing through the upper opening 211 will be sprayed upward from the upper opening 211 through the upper outlet 221 and spray onto the inner top wall of the oil tank 100 in a rotating form to peel off the dirty oil sludge on the inner top wall of the oil tank 100. The water flowing through the middle opening 212 will be sprayed horizontally and spray onto the inner peripheral wall of the oil tank 100 in a rotating form to peel off the dirty oil sludge on the inner peripheral wall of the oil tank 100 and cause the entire spray cylinder 210 to rotate automatically. The water flowing through the lower opening 213 will be sprayed downward from the lower opening 213 through the lower outlet 222 and spray onto the inner bottom wall of the oil tank 100 in a rotating form to peel off the dirty oil sludge on the inner bottom wall of the oil tank 100.

[0057] The present invention also provides an embodiment of a cleaning process for an oil tank, which uses the above-mentioned cleaning equipment for an oil tank and includes the following steps: S10. Drive the adjusting cylinder 220 to rotate relative to the spraying cylinder 210 about its own axis, so that the upper outlet 221 communicates with the upper opening 211 and / or the lower outlet 222 communicates with the lower opening 213; S20. Feed water into the spraying cylinder 210 and make the spraying cylinder 210 rotate on its own.

[0058] The foregoing are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cleaning device for an oil tank, characterized in that: It includes a spray cylinder and an adjustment cylinder. The spray cylinder is arranged vertically and is rotatably installed in the oil tank around its own axis; upper openings, middle openings and lower openings are successively arranged vertically on the spray cylinder; the upper openings face upwards, the middle openings are horizontal, and the lower openings face downwards; the adjustment cylinder is arranged vertically and installed on the spray cylinder. An upper outlet and a lower outlet are provided on the adjustment cylinder. The adjustment cylinder can rotate relative to the spray cylinder around its own axis, and the rotation of the adjustment cylinder can make the upper outlet communicate with the upper opening and / or the lower outlet communicate with the lower opening.

2. The cleaning device for an oil tank according to claim 1, wherein: The adjustment cylinder includes an upper cylinder section and a lower cylinder section, and the upper cylinder section is located above the lower cylinder section; both the upper cylinder section and the lower cylinder section cover the spray cylinder and can rotate relative to the spray cylinder around their own axes respectively; the upper outlet is provided on the upper cylinder section, and the lower outlet is provided on the lower cylinder section.

3. The cleaning device for an oil tank according to claim 2, characterized in that: The middle opening is inclined radially relative to the spray cylinder.

4. The cleaning device for an oil tank according to claim 3, characterized in that: The adjustment cylinder further includes a middle cylinder section. The middle cylinder section is a tubular structure that penetrates up and down. The middle cylinder section is sleeved with the spray cylinder, and in the vertical direction, the middle cylinder section is located between the upper cylinder section and the lower cylinder section. Both the upper cylinder section and the lower cylinder section are respectively rotationally matched with the middle cylinder section; a middle outlet is provided on the middle cylinder section. The middle outlet is inclined in the radial direction of the spray cylinder and is always communicated with the middle opening, and the inclination direction of the middle outlet is the same as that of the middle opening.

5. The cleaning device for an oil tank according to claim 1, characterized in that: A water pipe is detachably installed on the oil tank. The spray cylinder is installed on the water pipe through a connecting cylinder. The connecting cylinder is coaxial with the spray cylinder and can be communicated with the spray cylinder.

6. The cleaning device for an oil tank according to claim 5, characterized in that: The connecting cylinder is detachably connected to the water pipe.

7. A cleaning device for an oil tank according to claim 5, characterized in that: The spray cylinder is rotatably installed at one end of the connecting cylinder away from the water pipe through a rotating cylinder; the rotating cylinder is rotationally matched with the connecting cylinder through balls. The rotating cylinder is coaxial with the spray cylinder and is communicated with the spray cylinder; a water inlet is provided on the circumferential wall surface of the rotating cylinder, and water can sequentially pass through the balls and the water inlet along the radial direction of the rotating cylinder.

8. The cleaning device for an oil tank according to claim 7, characterized in that: A cover plate is coaxially arranged at one end of the rotating cylinder away from the spray cylinder. The outer circumferential wall surface of the cover plate abuts against the inner circumferential wall surface of the connecting cylinder. A plurality of water passing openings are provided on the cover plate. The plurality of water passing openings are evenly distributed on the cover plate around the axis of the rotating cylinder. The water passing openings, the balls and the water inlet are sequentially arranged in the radial direction of the rotating cylinder, and the water inlet is located on the side of the balls close to the axis of the rotating cylinder in the radial direction of the rotating cylinder.

9. The cleaning device for an oil tank according to claim 8, characterized in that: A pressure regulating cylinder is arranged between the cover plate and the rotating cylinder. A gap allowing water flow is defined between the pressure regulating cylinder and the rotating cylinder; a pressure relief valve is connected to the pressure regulating cylinder.

10. A cleaning process for an oil tank, which uses the cleaning equipment for an oil tank as described in any one of claims 1 to 9, wherein: It includes the following steps: S10, drive the adjustment cylinder to rotate relative to the spray cylinder around its own axis to make the upper outlet communicate with the upper opening and / or the lower outlet communicate with the lower opening; S20, let water flow into the spray cylinder and make the spray cylinder rotate by itself.

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