Storage tank oil-water interface detection device

Abstract

The invention discloses a storage tank oil-water interface detection device, and particularly relates to the technical field of detection devices.The storage tank oil-water interface detection device comprises a first guide pipe and a second guide pipe, an oil layer, a water layer and an emulsification layer are arranged in a cave depot, the emulsification layer is arranged at the top end of the water layer, the oil layer is arranged at the top end of the emulsification layer, and the bottom ends of the first guide pipe and the second guide pipe are both inserted into the water layer; the bottom ends of the first guide pipe and the second guide pipe are close to the bottom end in the cave depot, and the top ends of the first guide pipe and the second guide pipe extend to the ground and are provided with servo liquid level meter bodies. The first guide pipe and the second guide pipe are arranged, the second guide pipe is separated from the oil layer and the emulsifying layer, it is ensured that only water exists in the second guide pipe, the liquid level in the first guide pipe is kept consistent with the liquid level of the oil layer, and no oil enters the second guide pipe, so that the emulsifying layer cannot be formed; therefore, interference of an emulsion layer is avoided, and the oil quantity in the cave depot is measured more accurately.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection devices, in particular to a storage tank oil-water interface detection device. BACKGROUND

[0002] Petroleum is one of the important energy sources in today's society, and after the exploitation of petroleum, it needs to be properly stored, and the underground oil depot is a common petroleum storage method.

[0003] The underground oil depot is to store petroleum in the natural cave or artificial rock cave in the ground, and the core technology is the water-sealed oil storage principle, that is, the static pressure of underground water is used to form a sealed environment to store oil products, and the static pressure of underground water is always greater than the oil storage pressure, so that the oil products are locked in the environment formed by the water body and the rock wall, forming a natural isolation layer. This oil storage method has the advantages of strong concealment and low operating cost.

[0004] However, since the petroleum is located underground, the oil quantity in the underground cave cannot be directly and conveniently observed during the oil storage process, and in the prior art, a servo liquid level meter is generally used to detect the oil quantity in the cave. The oil and water are mixed in the cave, and the oil floats on the water surface, so two servo liquid level meters are needed during detection. The float of one servo liquid level meter floats on the oil surface, and the float of the other servo liquid level meter floats on the water surface, that is, on the contact surface of oil and water. The liquid level data of the two is collected, and the oil quantity is obtained after calculation. However, although petroleum and water are not miscible, the contact surface of the oil-water layer will be emulsified after a long time of contact, forming an emulsion layer, which separates the oil layer and the water layer, resulting in a blurred boundary between the two. The servo liquid level meter cannot accurately locate the oil-water boundary during detection, resulting in a significant decrease in detection accuracy. SUMMARY

[0005] The purpose of the present application is to provide a storage tank oil-water interface detection device, which separates the second guide pipe from the oil layer and the emulsion layer by setting the first guide pipe and the second guide pipe, so that the emulsion layer is not formed, thereby avoiding the interference of the emulsion layer and more accurately measuring the oil quantity in the cave.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: a storage tank oil-water interface detection device for detecting the oil quantity in the cave, comprising a first guide pipe and a second guide pipe, the inside of the cave is provided with an oil layer, a water layer and an emulsion layer, the emulsion layer is arranged at the top end of the water layer, and the oil layer is arranged at the top end of the emulsion layer. The bottom ends of the first guide pipe and the second guide pipe are inserted into the water layer, and the bottom ends of the first guide pipe and the second guide pipe are close to the bottom end of the inside of the cave. The top ends of the first guide pipe and the second guide pipe extend to the ground and are provided with a servo liquid level meter body. The outer end of the first guide pipe is provided with a plurality of convection ports which are longitudinally distributed along the first guide pipe, and the convection ports are only distributed inside the cavern; the bottom end of each of the two servo liquid level meter bodies is fixedly provided with a connecting wire, and the connecting wires of the two servo liquid level meter bodies extend to the inside of the cavern through the first guide pipe and the second guide pipe respectively; the bottom end of each of the two connecting wires is fixedly provided with a float, the float inside the second guide pipe floats on the liquid surface inside the second guide pipe, and the float inside the first guide pipe floats on the surface of the oil layer.

[0007] Further, the top end of the cavern is provided with two outer conveying pipes, the bottom end of each of the two outer conveying pipes is communicated with the inside of the cavern, the top end of each of the two outer conveying pipes extends to the ground, and the top end of each of the two outer conveying pipes is sleeved with a detachable top cover.

[0008] Further, the inside of one of the two outer conveying pipes is provided with an oil inlet hose, the top end of the oil inlet hose penetrates through the corresponding top cover and extends to the top of the outer conveying pipe, and the bottom end of the oil inlet hose extends to the inside of the cavern; The outer end of the oil inlet hose is fixedly provided with a plurality of buoyancy rings, the bottom end of the oil inlet hose floats on the surface of the oil layer through the buoyancy rings, the outer end of the oil inlet hose is provided with a plurality of oil discharge holes, and the oil discharge holes and the buoyancy rings are located in the cavern.

[0009] Further, the inside of the other outer conveying pipe is provided with an oil extraction hose, the top end of the oil extraction hose penetrates through the corresponding top cover and extends to the top of the top cover, the bottom end of the oil extraction hose is fixedly provided with a hard insertion tube, the bottom end of the hard insertion tube is inserted into the oil layer, the outer end of the hard insertion tube is fixedly provided with a buoyancy ball, and the hard insertion tube floats on the surface of the oil layer through the buoyancy ball.

[0010] Further, an induction assembly is arranged between the first guide pipe and the second guide pipe, the induction assembly comprises a connecting channel, the bottom end of the connecting channel is communicated with the inside of the cavern, the top end of the connecting channel extends to the ground and is provided with a detachable sealing cover, and the top end of the sealing cover is fixedly provided with a controller.

[0011] Further, a detachable partition plate is arranged on the inner wall of the connecting channel, and a spherical shell is fixedly arranged on the partition plate; The inside of the cavern is provided with an extension guide rod, the top end of the extension guide rod extends to the inside of the connecting channel and is fixedly provided with an adjusting ball, and the spherical shell is sleeved on the outer end of the adjusting ball.

[0012] Further, a sleeve capable of sliding up and down is sleeved on the outer end of the extension guide rod, a buoyancy cylinder is fixedly arranged on the outer end of the sleeve, and the sleeve floats on the surface of the oil layer through the buoyancy cylinder.

[0013] Further, the adjustable ball top is provided with a spotlight, the closed cover is provided with a light sensor, the light sensor penetrates the closed cover, in the static state, the light sensor is located directly above the spotlight, the outer side of the light sensor is provided with a light shield, and the light shield is detachably arranged on the inner wall of the closed cover.

[0014] In the above technical solution, the present application provides technical effects and advantages: 1. By arranging the first guide pipe and the second guide pipe, the second guide pipe is separated from the oil layer and the emulsion layer, so as to ensure that only water exists in the second guide pipe, the liquid level in the first guide pipe is consistent with the liquid level of the oil layer, the oil does not enter the second guide pipe, so that the emulsion layer is avoided, and the oil quantity in the hole reservoir is more accurately measured; 2. By arranging the induction assembly, the bottom end of the extension guide rod is inserted into the hole reservoir, and the buoyancy cylinder floats on the liquid surface, once the liquid surface fluctuates, the buoyancy cylinder is driven and the extension guide rod swings, finally the irradiation direction of the spotlight swings, and the light sensor is difficult to be irradiated, so that the light sensing condition of the light sensor directly reflects whether the liquid surface in the hole reservoir fluctuates, and the liquid level measurement is ensured when the liquid surface is static, and the error of the oil quantity measurement is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0016] Figure 1 It is a sectional view of the present application; Figure 2 It is a sectional view of the present application; Figure 1 It is an enlarged view of A part in the present application; Figure 3 It is a sectional view of the present application; Figure 1 It is an enlarged view of B part in the present application; Figure 4 It is a structure diagram of the servo liquid level meter of the present application; Figure 5 It is an internal structure diagram of the connecting channel of the present application; Figure 6 It is a structure diagram of the buoyancy cylinder of the present application; Figure 7 It is a structure diagram of the oil inlet hose of the present application; Figure 8 It is a system diagram of the present application.

[0017] Explanation of reference signs: 1, hole warehouse; 2, external conveying pipeline; 3, oil inlet hose; 301, oil discharge hole; 302, buoyancy ring; 4, servo liquid level meter main body; 401, connecting steel wire; 402, float; 5, induction assembly; 501, connecting channel; 502, closure cover; 503, partition; 504, spherical shell; 505, adjusting ball; 506, extension guide rod; 507, light shield; 508, spotlight; 509, light ray sensor; 510, sleeve; 511, buoyancy cylinder; 6, first guide pipe; 601, convection port; 7, second guide pipe; 8, oil extraction hose; 801, hard cannula; 802, buoyancy ball; 9, controller; 10, oil layer; 11, water layer; 12, emulsion layer. DETAILED DESCRIPTION

[0018] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0019] The present application provides a kind of oil-water interface detection device for detecting the oil quantity in hole warehouse 1 as shown in Figures 1-8 , which comprises first guide pipe 6 and second guide pipe 7, the hole warehouse 1 is internally provided with oil layer 10, water layer 11 and emulsion layer 12, the emulsion layer 12 is arranged at the top end of the water layer 11, and the oil layer 10 is arranged at the top end of the emulsion layer 12, the top end of the hole warehouse 1 is provided with two external conveying pipelines 2, the bottom end of the external conveying pipeline 2 is communicated with the inside of the hole warehouse 1, the top end of the external conveying pipeline 2 extends to the ground, and the top end of the external conveying pipeline 2 is sleeved with a detachable top cover, and the two external conveying pipelines 2 are respectively used for inputting or outputting oil.

[0020] The oil is injected into the hole warehouse 1, and then stored underground, the underground water in the hole warehouse 1 is mixed with the oil, the oil forms the oil layer 10 on the top, and the water forms the water layer 11 on the bottom, the contact surface of the oil layer 10 and the water layer 11 is clear in a short time, but the oil at the contact position of the two will be emulsified with water after a long time, forming the emulsion layer 12, which is separated between the oil layer 10 and the water layer 11; The oil needs to be input from the outside into the hole warehouse 1 for storage, as shown in Figure 1 , 7 , wherein one of the external conveying pipelines 2 is internally provided with an oil inlet hose 3, the top end of the oil inlet hose 3 penetrates through the corresponding top cover and extends to the top of the external conveying pipeline 2, and the bottom end of the oil inlet hose 3 extends to the inside of the hole warehouse 1. A plurality of buoyancy rings 302 are fixedly arranged at the outer end of the oil inlet hose 3, the bottom end of the oil inlet hose 3 floats on the surface of the oil layer 10 through the buoyancy ring 302, and a plurality of oil discharge holes 301 are arranged at the outer end of the oil inlet hose 3, and the oil discharge holes 301 and the buoyancy rings 302 are located in the hole warehouse 1.

[0021] The top end of the oil inlet hose 3 is connected to the oil pump, and then the oil is input into the storage hole 1 through the oil inlet hose 3, and the oil inlet hose 3 is sleeved with a plurality of buoyancy rings 302 near the bottom end. Under the action of the buoyancy of the buoyancy ring 302, the section of the oil inlet hose 3 floats on the surface of the oil layer 10, and the oil discharge hole 301 is also arranged on the surface of the section of the oil inlet hose 3. Therefore, after the oil is input into the inside of the oil input hole 1, the oil is discharged to the surface of the oil layer 10 through each oil discharge hole 301, and the oil discharge hole 301 plays a role of shunting, so that the oil is dispersedly discharged, thereby weakening the impact force after the oil is discharged, avoiding that the surface of the oil layer 10 is greatly fluctuated after the oil is discharged, and further avoiding that the detection accuracy is affected by the liquid level fluctuation.

[0022] The oil stored in the hole 1 also needs to be pumped out for use. As shown in Figure 1 、 3 , another outer conveying pipeline 2 is internally provided with an oil pumping hose 8, the top end of the oil pumping hose 8 penetrates through the corresponding top cover and extends to the top of the top cover, the bottom end of the oil pumping hose 8 is fixedly provided with a hard insertion pipe 801, the bottom end of the hard insertion pipe 801 is inserted into the oil layer 10, the outer end of the hard insertion pipe 801 is fixedly provided with a buoyancy ball 802, and the hard insertion pipe 801 floats on the surface of the oil layer 10 through the buoyancy ball 802.

[0023] The oil stored in the hole 1 needs to be finally pumped out for use. The top end of the oil pumping hose 8 can be connected to the oil pumping equipment on the ground. The density of the hard insertion pipe 801 itself is greater than that of the oil, but under the action of the buoyancy of the buoyancy ball 802, the hard insertion pipe 801 can float on the surface of the oil layer 10. The bottom end of the hard insertion pipe 801 protrudes from the surface of the buoyancy ball 802. Under the joint action of its own gravity and the buoyancy of the buoyancy ball 802, the hard insertion pipe 801 floats on the liquid surface of the oil layer 10 as a whole while keeping vertical and inserting the bottom end into the oil layer 10, so as to be able to pump out the oil through the hard insertion pipe 801 and the oil pumping hose 8, and the hard insertion pipe 801 can move synchronously with the liquid level of the oil layer 10. Since the hard insertion pipe 801 does not immerse into the oil layer 10 too deeply, it can effectively avoid the emulsion layer 12 and the water layer 11 from being mistakenly pumped out.

[0024] In order to more accurately measure the oil quantity in the hole 1, as shown in Figure 1 、 2 , 4, 8, the bottom ends of the first guide pipe 6 and the second guide pipe 7 are inserted into the water layer 11, and the bottom ends of the first guide pipe 6 and the second guide pipe 7 are close to the bottom end inside the hole 1. The top ends of the first guide pipe 6 and the second guide pipe 7 extend to the ground and are provided with a servo liquid level meter main body 4. The outer end of the first guide pipe 6 is provided with a plurality of convection ports 601 which are longitudinally distributed along the first guide pipe 6, and the convection ports 601 are only distributed inside the cavern 1. The bottom end of each of the two servo liquid level meter bodies 4 is fixedly provided with a connecting wire 401, and the two connecting wires 401 respectively extend to the inside of the cavern 1 through the first guide pipe 6 and the second guide pipe 7. The bottom end of each of the two connecting wires 401 is fixedly provided with a float 402. The float 402 inside the second guide pipe 7 floats on the liquid surface inside the second guide pipe 7, and the float 402 inside the first guide pipe 6 floats on the surface of the oil layer 10. The float 402 and the servo liquid level meter body 4 are connected through the connecting wire 401, and the liquid level height can be measured through the float 402 floating on the liquid surface.

[0025] The bottom end of each of the first guide pipe 6 and the second guide pipe 7 is inserted into the water layer 11, but only the bottom end of the second guide pipe 7 communicates with the water layer 11, and the outer end thereof is closed and does not communicate with the emulsion layer 12 and the oil layer 10. Therefore, only water exists inside the second guide pipe 7. In actual use, the oil layer 10 and the emulsion layer 12 will extrude the water layer 11 downward, so that water flows into the second guide pipe 7. Therefore, although only water exists inside the second guide pipe 7, the water level height inside the second guide pipe 7 is higher than the height of the water layer 11 in the cavern 1 and is lower than the height of the oil layer 10. The servo liquid level meter body 4 installed on the second guide pipe 7 measures the water level height inside the second guide pipe 7, and the more the oil, the more the water extruded into the second guide pipe 7, and the higher the water level height inside the second guide pipe 7. The first guide pipe 6 communicates with the outside through the convection ports 601 at the outer end thereof in addition to the bottom end. Therefore, the emulsion layer 12 and the oil layer 10 can enter the first guide pipe 6. The liquid level height inside the first guide pipe 6 is consistent with the liquid level height of the oil layer 10. The servo liquid level meter body 4 on the first guide pipe 6 measures the liquid level height inside the first guide pipe 6, and thus the liquid level height of the oil layer 10 is measured. After the liquid level height data of the oil layer 10 and the second guide pipe 7 are obtained, the oil quantity inside the cavern 1 can be calculated by combining the known density data of the oil and the water. Such a measurement method avoids the interference of the emulsion layer 12 because no oil enters the second guide pipe 7, so that the oil quantity inside the cavern 1 can be more accurately measured.

[0026] In order to avoid the influence of liquid level fluctuation on detection accuracy, the first guide pipe 6 and the second guide pipe 7 are provided with a plurality of convection ports 601. Figure 1 , 5, 6, 8, the first guide tube 6 and the second guide tube 7 between the induction component 5, the induction component 5 includes a connecting channel 501, the connecting channel 501 bottom end with the inside of the vault 1, the connecting channel 501 top end extends to the ground and is provided with a detachable closure cap 502, the closure cap 502 top end is fixedly provided with a controller 9.

[0027] The connecting channel 501 inner wall is provided with a detachable baffle 503, the baffle 503 is fixedly provided with a spherical shell 504; The inside of the vault 1 is provided with an extension guide rod 506, the extension guide rod 506 top end extends to the inside of the connecting channel 501 and is fixedly provided with an adjusting ball 505, the spherical shell 504 is sleeved on the outer end of the adjusting ball 505.

[0028] The outer end of the extension guide rod 506 is sleeved with a sleeve 510 which can slide up and down, the outer end of the sleeve 510 is fixedly provided with a buoyancy cylinder 511, the sleeve 510 floats on the surface of the oil layer 10 through the buoyancy cylinder 511, the bottom end of the extension guide rod 506 is fixedly provided with a limiting plate to prevent the sleeve 510 from falling off the bottom end of the extension guide rod 506.

[0029] The top end of the extension guide rod 506 is movably connected to the baffle 503 through the adjusting ball 505 and the spherical shell 504, the bottom end of the extension guide rod 506 is inserted into the inside of the vault 1, the sleeve 510 sleeved on the outer end of the extension guide rod 506 floats on the liquid surface of the oil layer 10 through the buoyancy cylinder 511, the gravity of the sleeve 510 and the buoyancy of the buoyancy cylinder 511 jointly act on the sleeve 510, so that the buoyancy cylinder 511 is half submerged in the oil layer 10 and half above the liquid surface of the oil layer 10, when the liquid surface is not fluctuating, the extension guide rod 506 is in a static state and remains vertical under the action of its own gravity, once the liquid surface fluctuates, the buoyancy cylinder 511 and the sleeve 510 will move transversely, and the extension guide rod 506 will swing, and the adjusting ball 505 will rotate accordingly.

[0030] When oil is injected into the inside of the vault 1 and discharged outward, the flow of oil is the main reason for the fluctuation of the liquid surface, and although one of the floats 402 is arranged in the inside of the first guide tube 6, the first guide tube 6 is communicated with the outside through the convection port 601, and the fluctuation of the liquid surface is easy to cause the fluctuation of the liquid surface in the inside of the first guide tube 6, so it is necessary to pay attention to the fluctuation of the liquid surface in the inside of the vault 1.

[0031] The top end of the adjusting ball 505 is provided with a spotlight 508, the closure cap 502 is provided with a light sensor 509, the light sensor 509 penetrates through the closure cap 502, in the static state, the light sensor 509 is located directly above the spotlight 508, the outer side of the light sensor 509 is provided with a light shield 507, the light shield 507 is detachably arranged on the inner wall of the closure cap 502.

[0032] In the static state, the extension guide rod 506 remains vertical, the light emitted by the spotlight 508 can enter the inside of the light shield 507 through the gap at the bottom end of the light shield 507 and irradiate the light ray sensor 509, once the liquid level in the cave 1 fluctuates, the extension guide rod 506 will swing and drive the adjusting ball 505 to rotate, the spotlight 508 will also rotate with the adjusting ball 505, and its light will be misaligned with the gap at the bottom end of the light shield 507, and the light ray sensor 509 cannot be irradiated by the light, therefore, whether the light ray sensor 509 senses the light can reflect whether the liquid level in the cave 1 fluctuates, and the fluctuation of the liquid level will affect the floating position of the float 402, and further affect the detection accuracy, in this way, the measurement can be ensured when the liquid level is static, and the detection accuracy is further improved.

[0033] The controller 9 is provided with a control computer, the liquid level data measured by the two servo liquid level meter bodies 4 is transmitted to the control computer through the controller 9, and the density difference compensation algorithm in the computer can obtain the oil quantity in the cave 1, and the light ray sensor 509 can sense the light intensity and display the light intensity data on the control computer through the controller 9, so as to intuitively judge whether the liquid level in the cave 1 has a large fluctuation.

[0034] The above detection method is not only suitable for underground oil storage, but also suitable for oil storage tanks which cannot directly observe the oil quantity, because the emulsification phenomenon may occur in the oil storage tank due to moisture, and further affect the detection accuracy, so it is also suitable, and will not be described in detail here.

[0035] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is not necessary to modify the described embodiments in various ways without departing from the spirit and scope of the present application for ordinary skilled in the art. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A storage tank oil-water interface detection device for detecting the amount of oil inside a cavern (1), comprising a first guide pipe (6) and a second guide pipe (7), wherein the cavern (1) contains an oil layer (10), a water layer (11), and an emulsion layer (12), and the bottom ends of the first guide pipe (6) and the second guide pipe (7) are both inserted into the water layer (11), characterized in that: The top ends of the first guide tube (6) and the second guide tube (7) extend to the ground and are provided with a servo level gauge body (4); The outer end of the first guide tube (6) is provided with multiple convection ports (601). The convection ports (601) are distributed longitudinally along the first guide tube (6). The bottom end of the servo level gauge body (4) is fixed with a connecting steel wire (401). The connecting steel wires (401) of the two servo level gauge bodies (4) extend into the cavern (1) through the first guide tube (6) and the second guide tube (7) respectively. The bottom ends of the two connecting steel wires (401) are fixed with floats (402). The floats (402) inside the second guide tube (7) float on the surface of the water layer (11), and the floats (402) inside the first guide tube (6) float on the surface of the oil layer (10).

2. The oil-water interface detection device for storage tanks according to claim 1, characterized in that: The cave (1) is provided with two external conveying pipes (2) at the top. The bottom of the external conveying pipes (2) is connected to the inside of the cave (1). The top of the external conveying pipes (2) extends to the ground. The top of the external conveying pipes (2) is covered with a top cover.

3. The oil-water interface detection device for storage tanks according to claim 2, characterized in that: One of the external transport pipes (2) is equipped with an oil inlet hose (3), the top end of which passes through the corresponding top cover and extends to the top of the external transport pipe (2), and the bottom end of which extends into the cave (1); The oil inlet hose (3) is fixed with multiple buoyancy rings (302) at its outer end. The bottom end of the oil inlet hose (3) floats on the surface of the oil layer (10) through the buoyancy rings (302). The oil inlet hose (3) is provided with multiple oil drain holes (301) at its outer end.

4. The oil-water interface detection device for storage tanks according to claim 2, characterized in that: Another external delivery pipe (2) is equipped with an oil extraction hose (8). The top end of the oil extraction hose (8) passes through the corresponding top cover and extends to the top of the top cover. A rigid insertion tube (801) is fixed at the bottom end of the oil extraction hose (8). The bottom end of the rigid insertion tube (801) is inserted into the oil layer (10). A buoyancy ball (802) is fixed at the outer end of the rigid insertion tube (801). The rigid insertion tube (801) floats on the surface of the oil layer (10) through the buoyancy ball (802).

5. The oil-water interface detection device for storage tanks according to claim 1, characterized in that: A sensing component (5) is provided between the first guide tube (6) and the second guide tube (7). The sensing component (5) includes a connecting channel (501). The bottom end of the connecting channel (501) is connected to the inside of the cave (1). The top end of the connecting channel (501) extends to the ground and is provided with a sealing cover (502). A controller (9) is fixedly provided at the top end of the sealing cover (502).

6. The oil-water interface detection device for storage tanks according to claim 5, characterized in that: The inner wall of the connecting channel (501) is provided with a partition (503), and a spherical shell (504) is fixedly provided on the partition (503). The cavern (1) is equipped with an extension guide rod (506), the top of which extends into the connecting channel (501) and is fixedly equipped with an adjusting ball (505), and the ball shell (504) is sleeved on the outer end of the adjusting ball (505).

7. The oil-water interface detection device for storage tanks according to claim 6, characterized in that: The outer end of the extension guide rod (506) is fitted with a sleeve (510), and the outer end of the sleeve (510) is fixedly fitted with a buoyancy cylinder (511). The sleeve (510) floats on the surface of the oil layer (10) through the buoyancy cylinder (511).

8. The oil-water interface detection device for storage tanks according to claim 6, characterized in that: A spotlight (508) is installed on the top of the adjusting ball (505), and a light sensor (509) is provided on the closed cover (502). A light shield (507) is provided on the outside of the light sensor (509), and the light shield (507) is provided on the inner wall of the closed cover (502).

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