Under-tank sampling device

Abstract

The invention belongs to the technical field of aviation oil sampling, and discloses an under-tank sampling device, which is used for carrying out unified online management sampling on a plurality of oil tanks in an oil depot and carrying out offline collection detection by adopting a collector, and comprises a collection assembly arranged on an opening at the top of the oil tank and a sampling control cabinet, the sampling control cabinet is connected with the collecting assembly through a line pipe for control and oil collection; the line pipe comprises an oil pipeline and a control circuit, a sampling pipe connected with an external collector is arranged on the sampling control cabinet, and the sampling pipe is communicated with the oil pipeline; the nitrogen making machine and the air compressor are connected with the sampling control cabinet and are controlled, the sampling control cabinet controls the air compressor to provide negative pressure for the collecting assembly to suck oil plants into an oil plant pipeline of the sampling control cabinet, and the sampling control cabinet controls the nitrogen making machine to introduce nitrogen into the oil plant pipeline of the sampling control cabinet for cleaning after completing oil plant collection. The device is simple in structure and can be compatible with an old oil tank for flexible oil sampling control.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation fuel sampling, and particularly relates to an under-tank sampling device. Background Art

[0002] Existing oil tanks for aviation fuel need to be sampled regularly for inspection. Sampling is to collect representative oil samples from different positions (such as the top, middle, and bottom) and liquid levels (upper layer, middle layer, and lower layer) of the oil tank, so that the samples can reflect the overall quality state of the oil in the tank. The core lies in following the "representativeness" principle to ensure that the samples taken are consistent with the composition and properties of the oil in the oil tank. The main function of oil tank sampling is to monitor the quality of stored oil, timely detect problems such as deterioration, contamination, and stratification that may occur during oil storage, provide a basis for the safe storage, transportation, and use of oil, and at the same time be used to verify whether the oil meets the requirements of relevant standards and specifications.

[0003] Regular oil tank sampling is because oil is affected by factors such as environmental temperature, humidity, storage time, and the gas environment in the tank during storage, and may undergo changes such as oxidation and deterioration, moisture condensation, impurity deposition, or component separation. Especially for oil stored for a long time, these changes will gradually accumulate. If not detected in time, it may lead to the inflow of unqualified oil into the use link, causing equipment failures, safety accidents, or quality disputes. The contents detected after sampling include the physical properties of the oil (such as density, viscosity, flash point, distillation range, etc.), chemical properties (such as acidity, sulfur content, oxidation stability, etc.), pollutant content (such as water content, mechanical impurities, sediment, etc.), and whether it contains additives or harmful components that do not meet the standards. Through these detection items, it is judged whether the oil meets the use requirements and whether there are potential hazards affecting storage safety, ensuring that the oil always meets the quality standards and use performance during the storage period.

[0004] There are various existing sampling methods. In the manual sampling method specified in the national standard, there are strict specification restrictions, and this sampling method requires people to strictly implement the specifications to ensure the effectiveness of sampling. The existing method is to sample through a separate oil discharge pipeline at the bottom of the oil tank. Although this method can determine the situation of the oil discharged from the oil tank, the reference degree for the oil index of the entire tank body is relatively low. And the existing automated sampling equipment for the transformation of old oil tanks all requires additional drilling and transformation on the oil tank, and the oil remains in the sampling equipment after each sampling, which will affect the secondary sampling. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an under-tank sampling device, aiming to sample multiple layers through the top of the oil tank, and use a nitrogen generator and an air compressor to sample under negative pressure and then introduce high-pressure nitrogen to clean the oil circuit.

[0006] The technical solution adopted by the present invention is as follows: In a first aspect, the present invention discloses an under-tank sampling device for uniformly managing and sampling a number of oil tanks in an oil depot online and collecting and detecting offline by a collector. It includes a collection component arranged on the opening at the top of the oil tank and a sampling control cabinet. The sampling control cabinet is connected to the collection component through a wire tube for control and oil collection; The wire tube includes an oil pipeline and a control circuit. A sampling tube for connecting an external collector is provided on the sampling control cabinet, and the sampling tube is communicated with the oil pipeline; It also includes a nitrogen generator and an air compressor connected to and controlled by the sampling control cabinet. The sampling control cabinet controls the air compressor to provide negative pressure to suck oil into the oil pipeline of the sampling control cabinet for the collection component, and the sampling control cabinet controls the nitrogen generator to introduce nitrogen into the oil pipeline of the sampling control cabinet for cleaning after the oil collection is completed.

[0007] Combined with the first aspect, the present invention provides a first implementation manner of the first aspect. The collection component includes a cover plate arranged at the opening at the top of the oil tank and a sampling winch arranged on the cover plate. The cover plate has a shielding cover that covers and shields the sampling winch. A reduction motor is also fixed on the cover plate. The transmission shaft of the reduction motor passes through the shielding cover and is in transmission connection with the sampling winch. A sealing ring is provided at the opening where the transmission shaft passes through the shielding cover; The collection component further includes a sampling suspension line wound around the sampling winch. One end of the sampling suspension line is fixed on the sampling winch, and the other end extends into the oil tank after winding around the sampling winch and is provided with a sampling bucket with a counterweight at the end.

[0008] Combined with the first implementation manner of the first aspect, the present invention provides a second implementation manner of the first aspect. The sampling bucket has a receiving cavity. A sampling tube communicating with the receiving cavity is provided outside the sampling bucket. An electromagnetic valve is provided at the sampling tube. The electromagnetic valve is connected to the external sampling control cabinet through a control circuit penetrating into the sampling suspension line for control.

[0009] Combined with the second implementation manner of the first aspect, the present invention provides a third implementation manner of the first aspect. The sampling bucket further includes a collection tube with an electromagnetic valve. An oil storage bucket is also provided at the top of the oil tank. The oil storage bucket has a docking port penetrating from the top of the oil tank. When the sampling bucket is lifted upward by the sampling winch to the inner surface of the top of the oil tank, the collection tube is connected to the docking port. The external air compressor unit is connected to the oil storage bucket to provide negative pressure to suck the oil in the sampling bucket into the oil storage bucket and keep the receiving cavity of the sampling bucket in a negative pressure state and then disconnect the connection. The sampling bucket is controlled to open the sampling tube to adsorb oil at a set depth in the oil tank when the receiving cavity is in a negative pressure state.

[0010] Combined with the third implementation manner of the first aspect, the present invention provides a fourth implementation manner of the first aspect. The sampling control cabinet is set on the ground. A negative pressure state is provided in the oil pipeline of the sampling control cabinet by an air compressor unit to suck out the oil liquid in the connected oil storage barrel and pour it into the butt-connected collector. After the collection is completed, nitrogen is provided by a nitrogen generator to clean the oil pipeline from the oil pipeline to the oil storage barrel, and the remaining oil in the oil storage barrel is refluxed into the oil tank through the docking port.

[0011] Combined with the first implementation manner of the first aspect, the present invention provides a fifth implementation manner of the first aspect. An oil pipeline communicating with the sampling barrel is provided in the sampling suspension line, and a negative pressure state is provided for the oil pipeline and the sampling barrel by an external air compressor unit to adsorb the oil liquid, and the adsorbed oil liquid enters the collector of the sampling control cabinet through the oil pipeline.

[0012] Combined with the fifth implementation manner of the first aspect, the present invention provides a sixth implementation manner of the first aspect. The sampling control cabinet is set on the top of the oil tank.

[0013] Combined with several implementation manners of the first aspect, the present invention provides a seventh implementation manner of the first aspect. A sampling groove is provided on the sampling control cabinet, and the sampling pipe passes through the sampling groove and is connected to the collector placed in the sampling groove to fill with oil.

[0014] Combined with the seventh implementation manner of the first aspect, the present invention provides an eighth implementation manner of the first aspect. An insertion port is provided on the side wall of the sampling groove, and the insertion port communicates with an external nitrogen generator. After the collector completes the collection of the oil liquid under the control of the sampling control cabinet, the soft sampling pipe is bent and inserted into the insertion port to be connected, and nitrogen is introduced into the sampling pipe by the nitrogen generator for cleaning.

[0015] Combined with several implementation manners of the first aspect, the present invention provides a ninth implementation manner of the first aspect. An operation panel is provided on the sampling control cabinet. A button for controlling single-sampling and a display screen for displaying information are provided on the operation panel. A PLC module is provided in the operation panel. By preloading a program for single-layer sampling and cleaning and activating it by the button, single-sampling into the collector and introducing nitrogen to clean the oil pipeline are completed.

[0016] The beneficial effects of the present invention are as follows: (1) By providing a sampling component at the opening on the top of the oil tank, the present invention can be installed on an already built and put-into-use oil tank, and a closed sampling operation can be carried out without having a great impact on it, so as to realize stratified sampling in a low-cost manner and have good safety; (2) The present invention provides negative pressure through the provided air compressor unit, thereby achieving a better adsorption effect. The nitrogen generator can prepare a certain amount of high-pressure nitrogen before each sampling, so as to purge the sampling pipeline on the premise of ensuring safety and not affecting the state of the oil in the oil tank, improve the accuracy of each sampling, and avoid detection errors caused by the mixing of oil samples after multiple samplings. (3) The sampling assembly with a sampling winch provided at the top of the oil tank in the present invention can collect oil at different depths for oil tanks of different depths, achieving the collection of oil at different depths while ensuring a relatively small volume as much as possible. Its cost is low and stability is high. Due to the closed characteristics of the oil tank itself, the structure of this soft rope suspension sampling will not be affected during the lifting and lowering process. (4) The present invention has two sampling methods, namely, providing negative pressure externally and using a pipeline to extend into the oil tank for adsorption sampling, and sampling by lowering a sampling bucket in a negative pressure closed state to the corresponding height. Combined with the setting position of the sampling control cabinet, both methods can effectively improve the convenience of operation and contribute to the sampling operation of management personnel. Description of the Drawings

[0017] Figure 1 is a partial internal schematic diagram of the entire oil tank in the embodiment of the present invention; Figure 2 is the present invention Figure 1 partial enlarged schematic diagram of A in; Figure 3 is a schematic diagram of the sampling control cabinet in the embodiment of the present invention; Figure 4 is a connection relationship diagram of the sampling device in the embodiment of the present invention.

[0018] In the figure: 1 - oil tank, 2 - sampling suspension line, 3 - sampling bucket, 4 - top seat, 5 - cover plate, 6 - sampling winch, 7 - oil storage bucket, 8 - sampling control cabinet, 9 - operation panel, 10 - sampling tank, 11 - collector, 12 - nitrogen generator, 13 - air compressor unit. Detailed Embodiments

[0019] The following further explains the present invention in conjunction with the drawings and specific embodiments.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Accordingly, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0022] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0023] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they should not be construed as indicating or implying relative importance.

[0024] In addition, in the description of the present application, if terms such as "horizontal" and "vertical" are used, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected to" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0026] Embodiment 1: This embodiment provides an under-tank sampling device, which mainly controls multiple oil tanks 1 in at least one area to perform autonomous sampling through an online system, and then arranges personnel to go to the site to collect the sampled oil liquid and then conduct inspections.

[0027] Among them, it should be determined that the process of collecting oil by this device operates according to the requirements of the national standard for mixed sampling specifications. Before setting up, it is necessary to determine the locations and numbers of the oil storage tanks that need to be sampled regularly within the jurisdiction of the oil management unit. At the same time, the oil information of each current oil storage tank is determined through the system. The system is a cloud system, and the system is carried by purchasing or leasing an online cloud server for remote data interaction and control.

[0028] Then, sampling equipment is set at the opening on the top of each oil storage tank. The sampling equipment in this embodiment consists of a sampling bucket 3, a sampling pipeline, an air compressor unit 13, and a nitrogen generator 12. Each sampling equipment has an independent sampling control cabinet 8. There is an operation panel 9 on the sampling control cabinet 8. The controller is operated through the operation panel 9 to control the sampling equipment. At the same time, the sampling control cabinet 8 is also equipped with a remote communication module, which is connected to the cloud system in a wireless or wired manner, and data is remotely sent and received and controlled through the cloud system.

[0029] Refer to Figure 1 , the figure shows the overall appearance of the existing structure of a single oil tank 1. Generally, this kind of aviation fuel storage tank structure is relatively large in volume and has a certain height. The sampling device set in this embodiment will be set on its top, and it is necessary to reach the top through the rotating ladder installed outside the oil tank 1 for setting.

[0030] The oil tank 1 in this embodiment is relatively large in volume, and its top structure is usually a lightweight frame structure, including a steel structure frame arranged radially inside, which is fixed on the inner wall of the top of the oil tank 1. Then, a circular top plate is set on the steel structure frame, and a circular top seat 4 is set in the middle part. The top seat 4 has a certain structural strength, and an opening communicating with the inside of the oil tank 1 is provided in the middle of the top seat 4.

[0031] As an implementation method, the sampling device in this embodiment includes a collection component set on the opening on the top of the oil tank 1 and a sampling control cabinet 8. The sampling control cabinet 8 is connected to the collection component through a wire tube for control and oil collection.

[0032] Among them, the wire tube includes an oil pipeline and a control line. A sampling tube connected to an external collector 11 is provided on the sampling control cabinet 8, and the sampling tube is communicated with the oil pipeline.

[0033] This sampling device also includes a nitrogen generator 12 and an air compressor connected to and controlled by the sampling control cabinet 8. The sampling control cabinet 8 controls the air compressor to provide negative pressure to suck oil into the oil pipeline of the sampling control cabinet 8, and the sampling control cabinet 8 controls the nitrogen generator 12 to introduce nitrogen into the oil pipeline of the sampling control cabinet 8 for cleaning after the oil collection is completed.

[0034] It should be noted that the sampling control cabinet 8 includes an oil pipeline part and an electric control part. One sampling control cabinet 8 can be connected to the sampling of several oil tanks 1 according to requirements, or can be used for the sampling of a single oil tank 1 alone. The oil pipeline in each sampling control cabinet 8 is not a single pipeline, but a pipe group set according to requirements, including several pipelines, valves and other structures, which are used to connect the oil tank 1 and collect the oil liquid and load it into the corresponding collector. The electric control part in the sampling control cabinet 8 is generally a set PLC, which is powered by the external power supply and is provided with explosion-proof measures, with high safety. Through the control program pre-loaded in the PLC, one-key sampling or remote sampling control can be realized.

[0035] It should also be noted that for the devices or methods involved in this embodiment, whether using online or offline data management methods, operators need to go to the site to bring back the samples and test the sampled oil liquid in a laboratory with conditions to obtain data.

[0036] In this embodiment, the oil management unit sets a sampling plan for all oil storage tanks within its jurisdiction. The sampling plan includes the sampling cycle of each oil storage tank and the on-site sampling schedule of the operators. For the oil management unit, generally, it manages several oil storage tanks in a certain area, but it may also involve the management of oil storage tanks at different locations across regions. Then, when the operator makes a single round-trip for sampling, he will determine which oil storage tanks to sample at each round-trip according to the location, and then set several oil storage tanks that reach a relatively close position as the management area. The operator stays on-site in the management area and makes on-site sampling at all the positions of the oil storage tanks corresponding to the management area according to the sampling schedule cycle.

[0037] Furthermore, referring to Figure 2 and Figure 4 , the collection component in this embodiment includes a cover plate 5 arranged at the top opening of the oil tank 1 and a sampling winch 6 arranged on the cover plate 5. The cover plate 5 has a shielding cover that covers and shields the sampling winch 6. A reduction motor is also fixed on the cover plate 5. The transmission shaft of the reduction motor passes through the shielding cover and is in transmission connection with the sampling winch 6. A sealing ring is provided at the opening where the transmission shaft passes through the shielding cover; the collection component also includes a sampling suspension line 2 wound on the sampling winch 6. One end of the sampling suspension line 2 is fixed on the sampling winch 6, and the other end extends into the oil tank 1 after winding around the sampling winch 6 and is provided with a sampling bucket 3 with a counterweight at the end.

[0038] The so-called shielding cover is an arc-shaped structure made of the same material as the cover plate 5. It can completely shield and cover the entire sampling winch 6 part, and cooperate with the cover plate 5 to have a port on one end face where the cover plate 5 is buckled on the top opening of the oil tank 1, for the sampling suspension line 2 on the sampling winch 6 to pass through and enter the oil tank 1. And the cover plate 5 itself is a sealing structure, which can be fixed at the opening through connection methods such as flanges. Once the cover plate 5 is fixedly connected to the opening, the sampling winch 6 can be regarded as being in the internal environment of the oil tank 1, and the volatile substances in the oil tank 1 cannot escape outward through the sampling winch 6, thus having better safety.

[0039] The so-called sampling suspension line 2 mostly uses metal braided cables. Since it has a certain depth in the oil tank 1, in order to achieve a large length of dragging, the inner layer uses a metal braided layer with higher strength as the main load-bearing structure, and its exterior can use anti-corrosion coatings or insulating sleeves to improve its anti-corrosion effect.

[0040] Furthermore, the sampling bucket 3 has a receiving cavity. A sampling pipe communicating with the receiving cavity is provided outside the sampling bucket 3. A solenoid valve is provided at the sampling pipe. The solenoid valve is connected to the external sampling control cabinet 8 through a control line penetrating into the sampling suspension line 2.

[0041] Among them, the sampling bucket 3 also includes a collecting pipe with a solenoid valve. An oil storage bucket 7 is also provided at the top of the oil tank 1. The oil storage bucket 7 has a docking port penetrating from the top of the oil tank 1. When the sampling bucket 3 is lifted upward by the sampling winch 6 to the inner surface of the top of the oil tank 1, the collecting pipe is connected to the docking port. The external air compressor unit 13 is connected to the oil storage bucket 7 to provide negative pressure to suck the oil stored in the sampling bucket 3 into the oil storage bucket 7 and keep the receiving cavity of the sampling bucket 3 in a negative pressure state and then disconnect the connection. The sampling bucket 3 is controlled to open the sampling pipe to adsorb the oil fluid at a set depth in the oil tank 1 when the receiving cavity is in a negative pressure state.

[0042] In this implementation method, since the sampling bucket 3 itself has a receiving cavity and can be used as a container for adsorbing a certain amount of oil fluid, there is no need to set a pipeline with the same length as the sampling suspension line 2. It can also be lowered to the corresponding depth by the sampling winch 6 to adsorb the oil fluid, and after each oil fluid collection, it is lifted to the top to pass the oil fluid into the oil storage bucket for mixing. Since this method cancels the setting of the relatively long pipeline itself, the sampling control cabinet 8 and heavier devices such as air compressors and nitrogen generators 12 can be placed on the ground, avoiding considering their load-bearing capacity when setting them on the top of the oil tank 1.

[0043] Then, the air compressor unit 13 provides a negative pressure state in the oil pipeline of the sampling control cabinet 8 to suck out the oil fluid in the connected oil storage bucket 7 and pour it into the butt-connected collector 11. After the collection is completed, the nitrogen generator 12 provides nitrogen to clean the oil pipeline from the oil pipeline to the oil storage bucket 7, and the remaining oil fluid in the oil storage bucket 7 is refluxed into the oil tank 1 through the docking port.

[0044] For the sampling device adopted in this embodiment, a sampling method is also provided, and this method is operated by the management personnel on-site.

[0045] Before sampling, the operator needs to wear anti-static clothing, protective gloves and goggles, use a clean 1L sealed tin bucket as the collector 11, and paste a label containing information such as the tank number, sampling date, operator number, etc. on the collector 11.

[0046] During sampling, the sampling bucket 3 is vertically inserted into the tank through the tank top, and the sampling position is determined according to experience or the liquid level gauge reading set on the sampling bucket 3 (usually at 1 / 6, 1 / 2, 5 / 6 of the liquid level height). The operator controls the diving depth of the sampling bucket 3 through the sampling winch 6 in the sampling equipment. When the target liquid level is reached, the air compressor unit 13 is started, and the oil sample is extracted with a vacuum degree of 0.3 - 0.5 MPa.

[0047] The amount of each sampling is about 300 mL. The flow state of the oil is judged by observing the transparent window of the sampling pipeline, and the valve is manually closed to stop sampling. After sampling at each liquid level is completed, the oil samples at different heights are injected into the collector 11 in equal volume ratio, and the pipeline is purged with nitrogen (pressure 0.2 - 0.3 MPa, purging time 10 seconds) to ensure that the residual oil flows back into the oil tank 1. This scheme is simple and efficient. By manually operating the sampling by the operator, it can be applied to most existing old oil storage sites.

[0048] As another embodiment, this embodiment also provides an under-tank sampling device.

[0049] Different from the above embodiment, the sampling bucket 3 in this embodiment only serves as a structure with a counterweight to extend the sampling suspension line 2 into the oil tank 1. An oil pipeline communicating with the sampling bucket 3 is arranged in the sampling suspension line 2, and the external air compressor unit 13 provides a negative pressure state to adsorb the oil liquid to the oil pipeline and the sampling bucket 3, and the adsorbed oil liquid enters the collector 11 of the sampling control cabinet 8 through the oil pipeline. In this way, the sampling control cabinet 8 is arranged on the top of the oil tank 1, and the air compressor unit 13 and the nitrogen generator 12 can be arranged on the ground and connected to the sampling control cabinet 8 through pipelines.

[0050] Refer to Figure 3 There is a sampling slot 10 on the sampling control cabinet 8. The sampling pipe passes through the sampling slot 10 and is connected to the collector 11 placed in the sampling slot 10 for filling with oil. There is an insertion port on the side wall of the sampling slot 10, and the insertion port is communicated with the external nitrogen generator 12. After the collector 11 completes the oil collection under the control of the sampling control cabinet 8, the soft sampling pipe is bent and inserted into the insertion port for connection, and the nitrogen generator 12 is used to introduce nitrogen into the sampling pipe for cleaning.

[0051] The sampling control cabinet 8 is provided with an operation panel 9. The operation panel 9 is provided with a button for controlling single sampling and a display screen for displaying information. The operation panel 9 is internally provided with a PLC module. By preloading a program for single-layer sampling and cleaning and activating it with the button, single sampling into the collector 11 and introducing nitrogen to clean the oil circuit are completed.

[0052] For the sampling device in this embodiment, a specific sampling method is also provided, which is as follows: Before sampling, the operator wears personal protective equipment such as sampling gloves, anti-static work clothes, work shoes, and safety helmets.

[0053] Select a collector 11 that is clean, dry, non-leaking, resistant to solvent action, has sufficient strength, and a suitable capacity. The collector 11 generally uses a tinplate barrel with a volume of 1L and good sealing performance. Labels are attached to the collector 11, indicating the sampling location, date, name of the sampler or other marks, tank number, name of the oil product, grade, and inspection type, etc.

[0054] Then the operator also determines the nitrogen gas pressure according to the sampling information. Before sampling, the operator needs to go to the nitrogen generation room to confirm whether the air compressor and nitrogen generator 12 are working properly, and the pressure value in the compressed air tank (the air compressor needs to be restarted manually by pressing a button after power-off). When sampling, the operator logs in to the computer or mobile terminal device and then logs in to the cloud system after connecting to the network. The operator enters the username and password. After logging in, the working status of the oil tank 1 is displayed. Then the storage number of the oil tank 1 that needs to be subjected to quality inspection is confirmed, the current liquid level height of the storage tank is determined, and information such as the liquid level, the pressure value of the gas source, and the position of the sampling bucket 3 is also displayed. Click on the oil tank 1 that needs to be sampled, for example, the 1# tank. According to the relevant sampling requirements, relevant information is selected and the start sampling button is clicked. After sampling is completed and the status shows that sampling is completed and bottling can be carried out, when arriving at the site of the corresponding storage tank number, use the key to open the sampler cabinet, place the collector 11 into the sampling trough 10, and press the sampling button to sample. After sampling is completed, remove the sampler and insert the sampling tube into the socket, and then inject high-pressure nitrogen into the oil pipeline through the nitrogen generator 12 for 5 - 10 s at regular intervals to empty it.

[0055] Finally, clean and lock the sampling control cabinet 8 of the oil tank 1, close the sampling software or wait for the next sampling, and arrange staff to go to the nitrogen generator 12 room to check the working status of each device and the pressure status of the gas storage tank.

[0056] The present invention is not limited to the above-mentioned optional embodiments, and anyone can obtain other various forms of products under the inspiration of the present invention. The above specific embodiments should not be construed as limiting the protection scope of the present invention, and the protection scope of the present invention shall be defined by the claims, and the specification can be used to interpret the claims.

Claims

1. A sampling device under the tank is used for uniformly managing and sampling a number of oil tanks (1) in an oil depot online, and a collector (11) is used for offline collection and detection. It is characterized in that: It includes a collection component arranged on the top opening of the oil tank (1) and a sampling control cabinet (8). The sampling control cabinet (8) is connected to the collection component through a pipeline for control and oil collection. The pipeline includes an oil pipeline and a control circuit. A sampling pipe connected to an external collector (11) is provided on the sampling control cabinet (8), and the sampling pipe is communicated with the oil pipeline. It also includes a nitrogen generator (12) and an air compressor unit (13) connected to and controlled by the sampling control cabinet (8). The sampling control cabinet (8) controls the air compressor unit (13) to provide negative pressure to the collection component to suck oil into the oil pipeline of the sampling control cabinet (8). The sampling control cabinet (8) controls the nitrogen generator (12) to introduce nitrogen into the oil pipeline of the sampling control cabinet (8) for cleaning after the oil collection is completed.

2. The under-tank sampling device according to claim 1, wherein: The collection component includes a cover plate (5) arranged at the top opening of the oil tank (1) and a sampling winch (6) arranged on the cover plate (5). There is a shielding cover on the cover plate (5) that covers and shields the sampling winch (6). A reduction motor is also fixed on the cover plate (5). The transmission shaft of the reduction motor passes through the shielding cover and is in transmission connection with the sampling winch (6). A sealing ring is provided at the opening where the transmission shaft passes through the shielding cover. The collection component further includes a sampling suspension wire (2) wound around the sampling winch (6). One end of the sampling suspension wire (2) is fixed on the sampling winch (6), and the other end extends into the oil tank (1) after winding around the sampling winch (6) and is provided with a sampling bucket (3) with a counterweight at the end.

3. The under-tank sampling device according to claim 2, characterized in that: The sampling bucket (3) has a receiving cavity. A sampling pipe communicated with the receiving cavity is provided outside the sampling bucket (3). An electromagnetic valve is provided at the sampling pipe. The electromagnetic valve is controlled and connected to an external sampling control cabinet (8) through a control circuit penetrating into the sampling suspension wire (2).

4. The under-tank sampling device according to claim 3, characterized in that: The sampling bucket (3) further includes a collection pipe with an electromagnetic valve. An oil storage bucket (7) is also provided at the top of the oil tank (1). The oil storage bucket (7) has a docking port penetrating from the top of the oil tank (1). When the sampling bucket (3) is lifted upward by the sampling winch (6) to the inner surface of the top of the oil tank (1), the collection pipe is connected to the docking port. The external air compressor unit (13) is connected to the oil storage bucket (7) to provide negative pressure to suck the oil stored in the sampling bucket (3) into the oil storage bucket (7) and keep the receiving cavity of the sampling bucket (3) in a negative pressure state and then disconnect the connection. The sampling bucket (3) is controlled to open the sampling pipe to adsorb the oil liquid at a set depth inside the oil tank (1) when the receiving cavity is in a negative pressure state.

5. The under-tank sampling device according to claim 4, characterized in that: The sampling control cabinet (8) is arranged on the ground. Negative pressure is provided in the oil pipeline of the sampling control cabinet (8) by the air compressor unit (13) to suck out the oil liquid in the connected oil storage bucket (7) and pour it into the docked collector (11). After the collection is completed, the nitrogen generator (12) provides nitrogen to clean the oil pipeline from the oil pipeline to the oil storage bucket (7), and the remaining oil in the oil storage bucket (7) is refluxed into the oil tank (1) through the docking port.

6. The under-tank sampling device according to claim 2, wherein: An oil pipeline communicating with the sampling bucket (3) is provided inside the sampling suspension wire (2), and a negative pressure state is provided for the oil pipeline and the sampling bucket (3) by an external air compressor unit (13) to adsorb the oil liquid, and the adsorbed oil liquid enters the collector (11) of the sampling control cabinet (8) through the oil pipeline.

7. The under-tank sampling device according to claim 6, wherein: The sampling control cabinet (8) is arranged on the top of the oil tank (1).

8. A tank-bottom sampling device according to any one of claims 2-7, characterized in that: A sampling groove (10) is provided on the sampling control cabinet (8), and the sampling pipe passes out of the sampling groove (10) and is connected to the collector (11) placed in the sampling groove (10) for filling with oil.

9. The under-tank sampling device according to claim 8, wherein: An insertion port is provided on the side wall of the sampling groove (10), and the insertion port communicates with an external nitrogen generator (12). After the collector (11) is controlled by the sampling control cabinet (8) to complete the oil liquid collection, the soft sampling pipe is bent and inserted into the insertion port for connection, and the nitrogen generator (12) is used to introduce nitrogen into the sampling pipe for cleaning.

10. A tank bottom sampling device according to any one of claims 2-7, characterized in that: An operation panel (9) is provided on the sampling control cabinet (8), and a button for controlling single - time sampling and a display screen for displaying information are provided on the operation panel (9). A PLC module is provided inside the operation panel (9). By pre - loading a program for single - time stratified sampling and cleaning and activating it by the button, single - time sampling into the collector (11) and introducing nitrogen to clean the oil circuit are completed.

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