Tank truck sampling positioning device and method

Abstract

The application discloses an oil tank truck sampling positioning device and method, and relates to the technical field of sampling devices.The application comprises a fixing seat, wherein a sampling device is arranged at the fixing seat; the sampling device comprises an auxiliary support frame fixed on the top of the fixing seat; a rack is fixed on the inner wall of the auxiliary support frame; a connecting plate is fixed on the rear side of the auxiliary support frame; a sliding plate is slidingly installed on the front side of the auxiliary support frame; a servo motor is fixed on the front side of the sliding plate; a gear is fixed on the output end of the servo motor; the gear is engaged with the rack; an electric cylinder and an outer sampling cylinder are fixed on the front side of the sliding plate from top to bottom through a support in sequence. Through the arrangement of the sampling device, the whole process is remotely started through a man-machine interaction interface; a PLC controller controls the servo motor to complete all lifting actions; an operator does not need to get on the truck and open the tank opening to expose to a harmful gas environment; and the application realizes intrinsic safety.

Description

Technical Field

[0001] This invention relates to the field of sampling device technology, specifically to a sampling and positioning device and method for oil tankers. Background Technology

[0002] In the liquid storage and transportation process, sampling and testing before loading and unloading tank trucks (or various types of liquid transport tank trucks) is a crucial step in ensuring liquid quality and preventing contamination from mixed loading. According to relevant standards, sampling of liquid transport tank trucks must be able to accurately obtain samples at different depths, especially samples from the upper and middle parts of the tank with the bottom as a reference, as the test data directly reflects the true quality of the liquid.

[0003] Existing sampling methods for liquid tank trucks suffer from the following technical drawbacks: First, traditional manual sampling relies on operators climbing to the top of the tank to open the opening, lowering the sampler via rope, and judging the sampling depth based on experience. This not only poses safety hazards such as falls from heights and inhalation of harmful gases, but also results in large depth judgment errors and difficulty in accurately locating the upper and middle sampling points based on the tank bottom, leading to insufficient sample representativeness. Second, some automated sampling equipment uses preset strokes to control the sampling depth, but liquid tank trucks have individual differences in capacity and the liquid level inside the tank is not fixed. Preset strokes cannot adapt to different working conditions, and sampling depth deviations still exist. Third, existing bottom-contact detection devices mostly use mechanical limiters or proximity switches for detection. Mechanical limiters are prone to rigid collision damage to the mechanism, have low sensitivity, and cannot accurately reflect the true bottom-contact state. At the same time, the springs are affected by fatigue limits, posing a risk that the mechanism will not function properly. Therefore, we propose a sampling positioning device and method for oil tank trucks. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a sampling and positioning device and method for oil tankers, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tanker truck sampling and positioning device, comprising a fixed base, a sampling device disposed at the fixed base, the sampling device comprising an auxiliary support frame fixed to the top of the fixed base, a rack fixed to the inner wall of the auxiliary support frame, a connecting plate fixed to the rear side of the auxiliary support frame, a sliding plate slidably mounted on the front side of the auxiliary support frame, a servo motor fixed to the front of the sliding plate, a gear fixed to the output end of the servo motor, the gear meshing with the rack, an electric cylinder and an outer sampling cylinder being fixed sequentially from top to bottom on the front of the sliding plate via a bracket, a pull rod fixed to the bottom of the telescopic end of the electric cylinder, a connecting rod fixed to the bottom of the pull rod, a piston fixed to the bottom of the connecting rod, an inner sampling cylinder fixed to the lower interior of the outer sampling cylinder, the connecting rod penetrating the top of the inner sampling cylinder, the piston slidably mounted inside the inner sampling cylinder, a flexible bottom contact joint fixed to the bottom of the outer sampling cylinder, and a fluororubber sealing gasket provided between the outer sampling cylinder and the flexible bottom contact joint.

[0006] According to the above technical solution, the servo motor has a real-time torque detection function and supports forward and reverse rotation control. A reducer is provided at the servo motor to reduce the output speed of the servo motor and increase the output torque.

[0007] According to the above technical solution, the servo motor is equipped with a torque detection module, which includes a torque sensor, a PLC controller, a human-machine interface, and a drive module. The torque sensor is integrated into the output end of the servo motor, which collects torque signals in real time and transmits them to the PLC controller. The PLC controller has a built-in torque threshold setting and comparison module, which determines the bottoming-out state through torque mutation and outputs control commands. The drive module responds to the commands to control the servo motor to move. The servo motor transmits the torque sensor signal to the input end of the PLC controller through a shielded wire. The servo motor is connected to the PLC controller through a CAN bus. The human-machine interface module communicates with the PLC controller through a cable.

[0008] According to the above technical solution, the torque sensor has a sampling frequency of ≥1kHz, converts the mechanical torque signal into a 4-20mA analog electrical signal, the PLC controller has a preset torque threshold of 1.5 times the no-load torque, a maximum safety threshold of 2 times the preset threshold, a human-machine interface with a touch screen, supports manual setting of sampling depth and torque threshold, displays the working status and fault alarm information in real time, and communicates with the PLC controller through an RS485 interface.

[0009] According to the above technical solution, the electric cylinder is used to adjust the sampling amount by controlling the stroke of the piston in the inner sampling cylinder through the pull rod and connecting rod. The electric cylinder is electrically connected to the PLC controller.

[0010] According to the above technical solution, an anti-sludge device is provided at the outer sampling cylinder. The anti-sludge device includes a fixed cylinder fixed to the outer wall of the outer sampling cylinder, a sealing disc fixed to the bottom of the fixed cylinder, a stopper disc slidably installed inside the fixed cylinder, a spring provided between the stopper disc and the top of the inner wall of the fixed cylinder, a push post fixed to the bottom of the stopper disc, the push post vertically penetrating the stopper disc, and a shielding cylinder fixed to the bottom of the push post. The shielding cylinder is located below the flexible bottom contact joint.

[0011] According to the above technical solution, an exhaust pipe is fixed to the top of the fixed cylinder, a crescent tube is fixed to the top of the exhaust pipe, an elastic folding bladder is fixed to the front of the slide plate, a pressure plate is fixed to the telescopic end of the elastic folding bladder, an electric push rod is also fixed to the front of the slide plate, a push plate is fixed to the telescopic end of the electric push rod, the pressure plate is located on the movement trajectory of the push plate, a magnetic ring one is fixed to the outside of the outer sampling cylinder, and a magnetic ring two is fixed to the top of the plug disc.

[0012] According to the above technical solution, a positioning post is slidably installed through the top of the sealing disc, a spring is provided between the positioning post and the top of the sealing disc, a sealing disc is fixed at the bottom of the positioning post, a circular groove for accommodating the sealing disc is opened at the bottom of the shielding cylinder, an oil drain hole is opened in the middle of the shielding cylinder, and the sealing disc is used to block the oil drain hole of the shielding cylinder.

[0013] According to the above technical solution, a contact plate is fixed to the top of the pressure plate, a U-shaped plate is fixed to the top of the push plate, the contact plate is located on the movement trajectory of the U-shaped plate, and a one-way nozzle is embedded in the top of the sealing disc.

[0014] The method for using the sampling and positioning device on an oil tanker includes the following steps: S1: Device initialization. The operator enters the password through the human-machine interface to access the console. S2: Align the center of the external sampling tube with the area to be sampled on the tanker truck, and keep the operator away from the danger zone to be sampled; S3: The operator starts the sampling program through the human-machine interface. The PLC controller sends a signal to the servo motor to control the servo motor to rotate forward. The slide plate is driven to move through the reducer, gear and rack transmission. The slide plate drives the outer sampling cylinder to descend vertically. The torque detection module transmits the servo motor torque data to the PLC controller in real time at 10ms / time. S4: When the flexible bottom contact joint contacts the bottom of the tank truck, the load on the servo motor increases, the torque rises to 5.3 N·m, and the torque exceeds the preset threshold of 5 N·m. The PLC controller immediately sends a stop signal, the servo motor is powered off and braked, and the operator records the current sampling tube position as the bottom contact reference position. At this time, the pressure sensor feeds back a 210 kPa signal, completing the bottom contact verification. S5: The PLC controller calculates the rising stroke according to the preset parameters, controls the servo motor to reverse, drives the outer sampling cylinder to rise 50mm and then stops. At this time, the sampling port at the end of the flexible bottom contact connector is located at the bottom sampling position 50mm above the bottom of the tank. S6: The PLC controller presets the stroke value of the electric cylinder. The extension and retraction end of the electric cylinder drives the pull rod and connecting rod to move the piston upward along the inside of the inner sampling cylinder. The inner sampling cylinder draws the oil into the inner sampling cylinder through the flexible bottom contact joint, and ensures that the sampling volume reaches 350ml±10ml to complete the sampling. S7: The operator sends a reset signal through the human-machine interface. The PLC controller controls the servo motor to drive the external sampling cylinder to rise to the initial position. The servo motor stops, and one sampling process ends.

[0015] This invention provides a sampling and positioning device and method for oil tankers. It has the following beneficial effects: (1) Through the setting of the sampling device, the entire process can be remotely started through the human-machine interface. The PLC controller controls the servo motor to complete all lifting actions. The operator does not need to board the vehicle or open the tank to be exposed to the harmful gas environment, thus achieving inherent safety. The torque detection module (10ms / time high frequency sampling) monitors the load of the servo motor in real time. When the torque exceeds the threshold of 5N·m, the PLC controller immediately determines that it has reached the bottom and records the position as the "bottoming reference position". This process does not depend on the height of the tank or the liquid level. It can automatically adapt to any type of tank and rise 50mm from the bottoming reference position to the bottom sampling position. This "find the bottom first, then lift" method ensures the absolute accuracy of the sampling point (such as 50mm above the bottom of the tank) and solves the problem of insufficient sample representativeness. The bottoming is detected by the change of servo motor torque instead of physical collision (the threshold of 5.3N·m > 5N·m stops). This is a non-contact / soft contact detection, which avoids the rigid impact of mechanical limit and greatly reduces the risk of equipment damage.

[0016] (2) By setting up an anti-sludge device, the present invention enables the shielding cylinder to contact the bottom of the tank before the flexible bottom contact joint, thereby physically isolating the flexible bottom contact joint from the direct contact with the sludge at the bottom of the tank, thus avoiding the problem of the sludge at the bottom of the tank clogging the flexible bottom contact joint from the root cause; during the subsequent process of the flexible bottom contact joint rising 50mm from the bottom reference position to the bottom sampling position, since the magnetic ring one and magnetic ring two are attracted to each other, the shielding cylinder still covers the outside of the flexible bottom contact joint, thereby avoiding the problem of the flexible bottom contact joint being exposed to the sludge environment again when it rises, ensuring that the flexible bottom contact joint is not clogged by scum when passing through the sludge liquid surface layer, and ensuring that the flexible bottom contact joint and the inner sampling cylinder take out the middle layer of clean oil.

[0017] (3) When the flexible bottom contact joint rises mm to the bottom sampling position after contacting the bottom reference position, the plug plate pushes the push column to move the shielding cylinder downward. The shielding cylinder no longer covers the outside of the flexible bottom contact joint. At this time, the flexible bottom contact joint can cooperate with the inner sampling cylinder to perform sampling operations. The gas pushes the plug plate to move, thereby avoiding the problem that the spring corresponding to the plug plate cannot completely reset the shielding cylinder under the frictional resistance between the plug plate and the inner wall of the fixed cylinder, which would cause the shielding cylinder to block the flexible bottom contact joint and affect the sampling operation of the flexible bottom contact joint in cooperation with the inner sampling cylinder. After the flexible bottom contact joint moves out of the oil surface, the sealing plate no longer blocks the oil drain hole of the shielding cylinder. The oil in the shielding cylinder can be drained back into the oil tank through the oil drain hole, thereby avoiding the problem that the oil in the oil tank remains inside the shielding cylinder and affects the inner sampling cylinder to extract the next sample. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the entire invention. Figure 1 ; Figure 2 This is a schematic diagram of the entire invention. Figure 2 ; Figure 3 This is a schematic diagram of a partial structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A; Figure 5 This is a partial cross-sectional schematic diagram of the sampling device of the present invention; Figure 6 This is a partial structural diagram of the sampling device of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the oil sludge prevention device of the present invention; Figure 8 This is a partial structural diagram of the oil sludge prevention device of the present invention. Figure 1 ; Figure 9 This is a partial structural diagram of the oil sludge prevention device of the present invention. Figure 2 ; Figure 10 This is a partial structural diagram of the oil sludge prevention device of the present invention. Figure 3 .

[0019] In the diagram: 1. Fixed base; 2. Sampling device; 21. Auxiliary support frame; 22. Rack; 23. Connecting plate; 24. Gear; 25. Slide plate; 26. Servo motor; 27. Electric cylinder; 28. Tie rod; 29. ​​Outer sampling cylinder; 210. Connecting rod; 211. Piston; 212. Inner sampling cylinder; 213. Flexible bottom contact joint; 3. Anti-sludge device; 31. Fixed cylinder; 32. Plug disc; 33. Push column; 34. Sealing disc; 35. Shielding cylinder; 36. Exhaust pipe; 37. Crescent tube; 38. Elastic folding bladder; 39. Pressure plate; 310. Push plate; 311. Electric push rod; 312. Contact plate; 313. U-shaped plate; 314. Magnetic ring one; 315. Magnetic ring two; 316. Positioning column; 317. Sealing disc; 318. One-way nozzle. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Please see Figures 1-10 One embodiment of the present invention is: a tanker truck sampling and positioning device, including a fixed base 1, a sampling device 2 disposed at the fixed base 1, the sampling device 2 including an auxiliary support frame 21 fixed to the top of the fixed base 1, a rack 22 fixed to the inner wall of the auxiliary support frame 21, a connecting plate 23 fixed to the rear side of the auxiliary support frame 21, a sliding plate 25 slidably mounted on the front side of the auxiliary support frame 21, a servo motor 26 fixed to the front of the sliding plate 25, a gear 24 fixed to the output end of the servo motor 26, the gear 24 meshing with the rack 22, and the front of the sliding plate 25 from top to bottom... An electric cylinder 27 and an outer sampling cylinder 29 are fixed to the bracket in sequence. A pull rod 28 is fixed to the bottom of the telescopic end of the electric cylinder 27. A connecting rod 210 is fixed to the bottom of the pull rod 28. A piston 211 is fixed to the bottom of the connecting rod 210. An inner sampling cylinder 212 is fixed to the lower part of the outer sampling cylinder 29. The connecting rod 210 passes through the top of the inner sampling cylinder 212. The piston 211 is slidably installed inside the inner sampling cylinder 212. A flexible bottom contact joint 213 is fixed to the bottom of the outer sampling cylinder 29. A fluororubber sealing gasket is provided between the outer sampling cylinder 29 and the flexible bottom contact joint 213.

[0022] The servo motor 26 is a servo motor with a rated power of 750W and a rated speed of 1500r / min. It has a real-time torque detection function with a torque detection accuracy of ≤0.1N·m and supports forward and reverse control. A reducer is installed at the servo motor 26 with a reduction ratio of 10:1 and a transmission efficiency of ≥95%, which is used to reduce the output speed of the servo motor 26 and increase the output torque.

[0023] The servo motor 26 is equipped with a torque detection module, which includes a torque sensor, a PLC controller, a human-machine interface, and a drive module. The torque sensor is integrated into the output of the servo motor 26, which collects torque signals in real time and transmits them to the PLC controller. The PLC controller has a built-in torque threshold setting and comparison module, which determines the bottoming-out state through torque mutation and outputs control commands. The drive module responds to the commands to control the servo motor 26 to move. The servo motor 26 transmits the torque sensor signal to the input of the PLC controller through a shielded wire. The servo motor 26 is connected to the PLC controller through a CAN bus. The human-machine interface module communicates with the PLC controller through a cable.

[0024] The torque sensor has a sampling frequency of ≥1kHz, converting the mechanical torque signal into a 4-20mA analog electrical signal. The PLC controller has a preset torque threshold of 1.5 times the no-load torque and a maximum safety threshold of 2 times the preset threshold. The human-machine interface is a touch screen, which supports manual setting of sampling depth and torque threshold. It displays the working status and fault alarm information in real time and communicates with the PLC controller via an RS485 interface.

[0025] The electric cylinder 27 is used to adjust the sampling amount by controlling the stroke of the piston 211 in the inner sampling cylinder 212 through the pull rod 28 and the connecting rod 210. The electric cylinder 27 is electrically connected to the PLC controller.

[0026] During use, the equipment is initialized. The operator enters the password through the human-machine interface to access the control console, aligns the center of the external sampling cylinder 29 with the center area to be sampled on the tanker truck, and moves away from the danger zone. The operator starts the sampling program through the human-machine interface. The PLC controller sends a signal to the servo motor 26, controlling the servo motor 26 to rotate forward. Through the reducer, gear 24, and rack 22, the servo motor 26 drives the slide plate 25 to move. The slide plate 25 drives the external sampling cylinder 29 to descend vertically. The torque detection module transmits the torque data of the servo motor 26 to the PLC controller in real time at 10ms / time. When the flexible bottom contact connector 213 contacts the bottom of the tanker truck, the servo motor 26... As the load increases and the torque rises to 5.3 N·m, exceeding the preset threshold of 5 N·m, the PLC controller immediately sends a stop signal. The servo motor 26 is de-energized and braked. The operator records the current sampling tube position as the bottom-touching reference position. At this time, the pressure sensor returns a 210 kPa signal, completing the bottom-touching verification. The PLC controller calculates the upward stroke based on preset parameters and controls the servo motor 26 to reverse, driving the outer sampling cylinder 29 to rise 50 mm before stopping. At this point, the sampling port at the end of the flexible bottom-touching connector 213 is located at the bottom sampling position 50 mm above the bottom of the tank. The PLC controller, through the preset stroke value of the electric cylinder 27, drives the pull rod 28 and... Connecting rod 210 drives piston 211 to move upward along the inside of inner sampling cylinder 212. Oil is drawn into inner sampling cylinder 212 through flexible bottom connector 213, ensuring a sampling volume of 350ml ± 10ml. After sampling, the operator sends a reset signal via the human-machine interface. The PLC controller controls servo motor 26 to drive outer sampling cylinder 29 to the initial position, at which point servo motor 26 stops, completing one sampling cycle. The entire process can be remotely started via the human-machine interface. The PLC controller controls servo motor 26 to complete all lifting and lowering actions. Operators do not need to board the vehicle or open the tank opening to be exposed to harmful gases. It achieves inherent safety; the torque detection module (10ms / time high-frequency sampling) monitors the load of the servo motor 26 in real time. When the torque exceeds the 5N·m threshold, the PLC controller immediately determines that it has bottomed out and records the position as the "bottoming out reference position". This process does not depend on the height of the tank truck or the liquid level and can automatically adapt to any type of tank truck. It rises 50mm from the bottoming out reference position to the bottom sampling position. This "find the bottom first, then lift" method ensures the absolute accuracy of the sampling point (such as 50mm above the bottom of the tank) and solves the problem of insufficient sample representativeness; it uses the torque change of the servo motor 26 instead of physical collision to detect bottoming out (the threshold is 5.3N·m > 5N·m and it stops). This is a non-contact / soft contact detection method, which avoids the rigid impact of mechanical limit and greatly reduces the risk of equipment damage.

[0027] It should be noted that by replacing the flexible bottom connector 213 with different materials (such as silicone rubber for food-grade liquids and fluororubber for highly corrosive liquids) and sampling tubes (such as PTFE for ultra-high temperature liquids), the sampling needs of different types of liquid transport tank trucks in the food, chemical, and pharmaceutical industries can be met, demonstrating strong versatility.

[0028] Please see Figures 1-10 Based on the above embodiments, in another embodiment of the present invention, an anti-sludge device 3 is provided at the outer sampling cylinder 29. The anti-sludge device 3 includes a fixed cylinder 31 fixed to the outer wall of the outer sampling cylinder 29. A sealing disc 34 is fixed at the bottom of the fixed cylinder 31. A stopper disc 32 is slidably installed inside the fixed cylinder 31. A spring is provided between the stopper disc 32 and the top of the inner wall of the fixed cylinder 31. A pusher 33 is fixed at the bottom of the stopper disc 32. The pusher 33 vertically penetrates the stopper disc 32. A shielding cylinder 35 is fixed at the bottom of the pusher 33. The shielding cylinder 35 is located below the flexible bottom contact connector 213. Through the above structure, the shielding cylinder 35 contacts the bottom of the tank before the flexible bottom contact connector 213, thereby physically isolating the flexible bottom contact connector 213 from direct contact with the sludge at the bottom of the tank, thus fundamentally avoiding the problem of the sludge at the bottom of the tank clogging the flexible bottom contact connector 213.

[0029] An exhaust pipe 36 is fixed to the top of the fixed cylinder 31, and a crescent-shaped pipe 37 is fixed to the top of the exhaust pipe 36. An elastic folding bladder 38 is fixed to the front of the slide plate 25, and a pressure plate 39 is fixed to the telescopic end of the elastic folding bladder 38. An electric push rod 311 is also fixed to the front of the slide plate 25, and a push plate 310 is fixed to the telescopic end of the electric push rod 311. The pressure plate 39 is located on the movement trajectory of the push plate 310. A magnetic ring 314 is fixed to the outside of the outer sampling cylinder 29, and a magnetic ring 315 is fixed to the top of the plug disc 32. Through the above structure, it is ensured that the flexible bottom contact joint 213 is not clogged by scum when passing through the oil sludge surface layer, and that the flexible bottom contact joint 213 and the inner sampling cylinder 212 obtain the middle layer of clean oil.

[0030] A positioning post 316 is slidably mounted through the top of the sealing disc 34. A spring is provided between the positioning post 316 and the top of the sealing disc 34. A sealing disc 317 is fixed to the bottom of the positioning post 316. A circular groove for accommodating the sealing disc 317 is opened at the bottom of the shielding cylinder 35. An oil drain hole is opened in the middle of the shielding cylinder 35. The sealing disc 317 is used to block the oil drain hole of the shielding cylinder 35. An abutment plate 312 is fixed to the top of the pressure plate 39. A U-shaped plate 313 is fixed to the top of the push plate 310. The abutment plate 312 is located on the movement trajectory of the U-shaped plate 313. A one-way nozzle 318 is embedded in the top of the sealing disc 317. Through the above structure, the problem of oil residue in the oil tank remaining inside the shielding cylinder 35 and affecting the sampling cylinder 212 to extract the next sample is avoided.

[0031] During use, the slide plate 25 drives the outer sampling cylinder 29 to descend vertically. During the process of the flexible bottom contact connector 213 contacting the bottom of the tank truck, the outer sampling cylinder 29 will first drive the shielding cylinder 35 to move downward through the fixed cylinder 31, the plug plate 32 and the push column 33. The shielding cylinder 35 will first contact the bottom of the tank truck. After that, as the outer sampling cylinder 29 continues to move downward, the positions of the shielding cylinder 35, the push column 33 and the plug plate 32 will no longer move, while the outer sampling cylinder 29 and the flexible bottom contact connector 213 will continue to move downward. The flexible bottom contact connector 213 moves into the interior of the shielding cylinder 35 and contacts the bottom of the inner wall of the shielding cylinder 35. The shielding cylinder 35 contacts the bottom of the tank before the flexible bottom contact connector 213, thereby physically isolating the flexible bottom contact connector 213 from direct contact with the oil sludge at the bottom of the tank, thus avoiding the problem of the oil sludge at the bottom of the tank clogging the flexible bottom contact connector 213 from the root.

[0032] After the shielding cylinder 35 contacts the bottom of the tanker, as the outer sampling cylinder 29 continues to move downwards, the positions of the shielding cylinder 35, push column 33, and plug disc 32 no longer move, and the magnetic ring 215 also stops moving. As the outer sampling cylinder 29 continues to move downwards, it will drive the magnetic ring 215 to the magnetic ring 1 314. Under magnetic force, the magnetic ring 1 314 and the magnetic ring 2 315 attract each other. During the subsequent process of the flexible bottom contact joint 213 rising 50mm from the bottom reference position to the bottom sampling position, since the magnetic ring 1 314 and the magnetic ring 2 315 attract each other, the shielding cylinder 35 still covers the outside of the flexible bottom contact joint 213, thus avoiding the problem of the flexible bottom contact joint 213 being exposed to the sludge environment again when it rises. This ensures that the flexible bottom contact joint 213 is not clogged by scum when passing through the sludge liquid surface layer, and ensures that the flexible bottom contact joint 213 and the inner sampling cylinder 212 take out the middle layer of clean oil.

[0033] As the outer sampling cylinder 29 continues to move downwards, the spring between the stopper disc 32 and the fixed cylinder 31 is compressed, and the air between the stopper disc 32 and the fixed cylinder 31 is forced into the elastic pleated bladder 38 through the exhaust pipe 36 and the crescent pipe 37. The elastic pleated bladder 38 will expand. When the subsequent flexible bottom contact joint 213 rises 50mm from the bottom reference position to the bottom sampling position, the operator activates the electric push rod 311. The telescopic end of the electric push rod 311 drives the push plate 310 to compress the elastic pleated bladder 38 through the pressure plate 39. The air inside the elastic pleated bladder 38 enters between the stopper disc 32 and the fixed cylinder 31 through the crescent pipe 37 and the exhaust pipe 36. At this time, under the action of gas, the stopper disc... When the stopper disc 32 is displaced, it causes the magnetic ring 314 to separate from the magnetic ring 315. As the stopper disc 32 continues to move, it pushes the pusher 33 to move the shielding cylinder 35 downward. The shielding cylinder 35 is no longer covering the outside of the flexible bottom contact joint 213. At this time, the flexible bottom contact joint 213 can cooperate with the inner sampling cylinder 212 to perform sampling operations. The gas pushes the stopper disc 32 to move, thereby avoiding the problem that the spring corresponding to the stopper disc 32 cannot completely reset the shielding cylinder 35 under the action of frictional resistance between the stopper disc 32 and the inner wall of the fixed cylinder 31, which would cause the shielding cylinder 35 to block the flexible bottom contact joint 213 and affect the flexible bottom contact joint 213 to cooperate with the inner sampling cylinder 212 to perform sampling operations.

[0034] After the flexible bottom contact joint 213 is removed from the oil surface, the operator activates the electric push rod 311. The telescopic end of the electric push rod 311 retracts and moves, causing the U-shaped plate 313 to move as well. The U-shaped plate 313 pulls the contact plate 312 and the pressure plate 39 to move. The pressure plate 39 causes the elastic folding bladder 38 to stretch. At this time, the elastic folding bladder 38 draws air from between the stopper disc 32 and the fixed cylinder 31 through the crescent tube 37 and the exhaust pipe 36. Under the negative pressure, the stopper disc 32 moves upward along the inside of the fixed cylinder 31, and the spring corresponding to the stopper disc 32 is compressed. At the same time, the stopper disc 32 drives the shielding cylinder 35 to move upward through the push rod 33. The shielding cylinder 35 is misaligned with the sealing disc 317, and the sealing disc 317 no longer blocks the oil drain hole of the shielding cylinder 35. The oil in the shielding cylinder 35 can be discharged back into the oil tank through the oil drain hole, thereby avoiding the problem of oil remaining in the oil tank inside the shielding cylinder 35, which would affect the sampling cylinder 212 from taking the next sample.

[0035] It should be noted that during the process of the flexible bottom contact joint 213 moving into the interior of the shielding cylinder 35, the oil in the shielding cylinder 35 will be discharged through the one-way nozzle 318 from the space between the flexible bottom contact joint 213 and the shielding cylinder 35 under the squeezing action of the flexible bottom contact joint 213.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sampling and positioning device for oil tankers, characterized in that: The device includes a fixed base (1), a sampling device (2) is provided at the fixed base (1), the sampling device (2) includes an auxiliary support frame (21) fixed to the top of the fixed base (1), a rack (22) is fixed to the inner wall of the auxiliary support frame (21), a connecting plate (23) is fixed to the rear side of the auxiliary support frame (21), a sliding plate (25) is slidably installed on the front side of the auxiliary support frame (21), a servo motor (26) is fixed to the front of the sliding plate (25), a gear (24) is fixed to the output end of the servo motor (26), the gear (24) meshes with the rack (22), and the front of the sliding plate (25) is fixed by brackets from top to bottom. There is an electric cylinder (27) and an outer sampling cylinder (29). A pull rod (28) is fixed at the bottom of the telescopic end of the electric cylinder (27). A connecting rod (210) is fixed at the bottom of the pull rod (28). A piston (211) is fixed at the bottom of the connecting rod (210). An inner sampling cylinder (212) is fixed at the bottom inside the outer sampling cylinder (29). The connecting rod (210) passes through the top of the inner sampling cylinder (212). The piston (211) is slidably installed inside the inner sampling cylinder (212). A flexible bottom contact joint (213) is fixed at the bottom of the outer sampling cylinder (29). A fluororubber sealing gasket is provided between the outer sampling cylinder (29) and the flexible bottom contact joint (213).

2. The oil tanker sampling and positioning device according to claim 1, characterized in that: The servo motor (26) has a real-time torque detection function and supports forward and reverse rotation control. A reducer is provided at the servo motor (26) to reduce the output speed of the servo motor (26) and increase the output torque.

3. The oil tanker sampling and positioning device according to claim 1, characterized in that: The servo motor (26) is equipped with a torque detection module, which includes a torque sensor, a PLC controller, a human-machine interface and a drive module. The torque sensor is integrated into the output end of the servo motor (26), which collects torque signals in real time and transmits them to the PLC controller. The PLC controller has a built-in torque threshold setting and comparison module, which determines the bottoming state through torque mutation and outputs control commands. The drive module responds to the commands to control the servo motor (26) to move. The servo motor (26) transmits the torque sensor signal to the input end of the PLC controller through a shielded wire. The servo motor (26) is connected to the PLC controller through a CAN bus. The human-machine interface module communicates with the PLC controller through a cable.

4. The oil tanker sampling and positioning device according to claim 3, characterized in that: The torque sensor has a sampling frequency of ≥1kHz and converts the mechanical torque signal into a 4-20mA analog electrical signal. The PLC controller has a preset torque threshold of 1.5 times the no-load torque and a maximum safety threshold of 2 times the preset threshold. The human-machine interface is a touch screen, which supports manual setting of sampling depth and torque threshold, real-time display of operation status and fault alarm information, and communication with the PLC controller via RS485 interface.

5. The oil tanker sampling and positioning device according to claim 3, characterized in that: The electric cylinder (27) is used to adjust the sampling amount by controlling the stroke of the piston (211) in the inner sampling cylinder (212) through the pull rod (28) and the connecting rod (210). The electric cylinder (27) is electrically connected to the PLC controller.

6. The oil tanker sampling and positioning device according to claim 1, characterized in that: An anti-sludge device (3) is provided at the outer sampling cylinder (29). The anti-sludge device (3) includes a fixed cylinder (31) fixed to the outer wall of the outer sampling cylinder (29). A sealing disc (34) is fixed at the bottom of the fixed cylinder (31). A stopper disc (32) is slidably installed inside the fixed cylinder (31). A spring is provided between the stopper disc (32) and the top of the inner wall of the fixed cylinder (31). A pusher (33) is fixed at the bottom of the stopper disc (32). The pusher (33) penetrates the stopper disc (32) vertically. A shielding cylinder (35) is fixed at the bottom of the pusher (33). The shielding cylinder (35) is located below the flexible bottom contact joint (213).

7. The oil tanker sampling and positioning device according to claim 6, characterized in that: An exhaust pipe (36) is fixed to the top of the fixed cylinder (31), a crescent tube (37) is fixed to the top of the exhaust pipe (36), an elastic folding bladder (38) is fixed to the front of the slide plate (25), a pressure plate (39) is fixed to the telescopic end of the elastic folding bladder (38), an electric push rod (311) is also fixed to the front of the slide plate (25), a push plate (310) is fixed to the telescopic end of the electric push rod (311), the pressure plate (39) is located on the movement trajectory of the push plate (310), a magnetic ring one (314) is fixed to the outside of the outer sampling cylinder (29), and a magnetic ring two (315) is fixed to the top of the plug disc (32).

8. The oil tanker sampling and positioning device according to claim 7, characterized in that: A positioning post (316) is slidably mounted through the top of the sealing disc (34). A spring is provided between the positioning post (316) and the top of the sealing disc (34). A sealing disc (317) is fixed at the bottom of the positioning post (316). A circular groove for accommodating the sealing disc (317) is opened at the bottom of the shielding cylinder (35). An oil drain hole is opened in the middle of the shielding cylinder (35). The sealing disc (317) is used to block the oil drain hole of the shielding cylinder (35).

9. The oil tanker sampling and positioning device according to claim 8, characterized in that: The pressure plate (39) is fixed with an abutment plate (312) at the top, the push plate (310) is fixed with a U-shaped plate (313) at the top, the abutment plate (312) is located on the movement trajectory of the U-shaped plate (313), and the sealing disc (317) is embedded with a one-way nozzle (318) at the top.

10. A method of using a tanker truck sampling and positioning device, comprising the tanker truck sampling and positioning device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Device initialization. The operator enters the password through the human-machine interface to access the console. S2: Align the center of the external sampling tube (29) with the center area to be sampled on the tanker truck, and keep the operator away from the dangerous area to be sampled; S3: The operator starts the sampling program through the human-machine interface. The PLC controller sends a signal to the servo motor (26) to control the servo motor (26) to rotate forward. Through the reducer, gear (24) and rack (22) transmission, the slide plate (25) is driven to move. The slide plate (25) drives the outer sampling cylinder (29) to descend vertically. The torque detection module transmits the torque data of the servo motor (26) to the PLC controller in real time at 10ms / time. S4: When the flexible bottom contact joint (213) contacts the bottom of the tank truck, the load of the servo motor (26) increases, the torque rises to 5.3 N·m, and the torque exceeds the preset threshold of 5 N·m. The PLC controller immediately sends a stop signal, the servo motor (26) is powered off and braked, and the operator records the current sampling tube position as the bottom contact reference position. At this time, the pressure sensor feeds back a 210 kPa signal to complete the bottom contact verification. S5: The PLC controller calculates the upward stroke according to the preset parameters, controls the servo motor (26) to reverse, drives the external sampling cylinder (29) to rise 50mm and then stops. At this time, the sampling port at the end of the flexible bottom contact connector (213) is located at the bottom sampling position 50mm above the bottom of the tank. S6: The PLC controller presets the stroke value through the electric cylinder (27). The extension end of the electric cylinder (27) drives the pull rod (28) and the connecting rod (210) to drive the piston (211) to move upward along the inside of the inner sampling cylinder (212). The inner sampling cylinder (212) draws the oil into the inner sampling cylinder (212) through the flexible bottom contact joint (213) and ensures that the sampling volume reaches 350ml±10ml to complete the sampling. S7: The operator sends a reset signal through the human-machine interface. The PLC controller controls the servo motor (26) to drive the external sampling cylinder (29) to rise to the initial position. The servo motor (26) stops, and one sampling process ends.

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