CN110006706B - Automatic sampler for oil unloading and sampling of oil tank truck - Google Patents
Automatic sampler for oil unloading and sampling of oil tank truck Download PDFInfo
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- CN110006706B CN110006706B CN201910392883.8A CN201910392883A CN110006706B CN 110006706 B CN110006706 B CN 110006706B CN 201910392883 A CN201910392883 A CN 201910392883A CN 110006706 B CN110006706 B CN 110006706B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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Abstract
The invention discloses an automatic sampler for oil discharge sampling of an oil tank truck, which comprises: the operation unit is used for completing the operations of parameter setting, running and stopping, data display and the like of the sampler; the detection unit is used for detecting the oil discharge quantity signal and sending the oil discharge quantity signal to the control unit; the control unit is used for receiving the oil discharge amount signal, and driving the execution unit to complete sampling operation according to the sampling parameters set by the operation unit when the oil discharge amount reaches a set value; and the execution unit is used for controlling the stepping motor connected with the execution unit to rotate quantitatively through the control unit so as to drive the sampling piston device connected with the stepping motor to stretch and retract once to finish quantitative sampling. The front end of the sampling piston device is an annular gap which is arranged on the oil unloading pipeline, and the sampling port and the oil unloading pipeline are kept isolated in the sampling process due to the annular sampling structure. The invention solves the problem of difficult quantitative sampling in the oil unloading process of the oil tank truck, and is suitable for sampling operation in the closed oil unloading process.
Description
Technical Field
The invention relates to the technical field of testing, in particular to an automatic sampler for oil unloading and sampling of an oil tank truck.
Background
Sampling and testing water content is an important link in oil delivery of an oil tank truck, the oil unloading and sampling of the oil tank truck are basically carried out by adopting a manual method at present, an operator uses a sampling spoon to connect samples at an oil unloading port, and samples are manually sampled from top to bottom according to the ratio of 1:3:1 or 2:6:2 generally according to the three stages of top, middle and bottom. Such sampling has a number of disadvantages. For example, the bottom water of the tank car must be discharged first, and the tank car needs to be weighed again; sampling according to the upper, middle and lower three stages in a ratio of 1:3:1 or 2:6:2, wherein the sampling times are less, and the sample representativeness is poor; when the bottom water of the tank car is not completely discharged, the water is probably taken for the first sampling, and the sampling time is not easy to grasp; the oil discharge device is completely operated manually, and operators need to wait for sampling at the oil discharge port all the time in the oil discharge process; such sampling methods cannot be used in contained oil discharge, and the like.
Disclosure of Invention
In order to solve the technical problem that the oil tank truck is difficult to sample according to the oil unloading quantity in the oil unloading process, the invention provides the automatic sampler for oil unloading and sampling of the oil tank truck. After oil discharge is started, the flowmeter rotates to send out pulse signals, and the number of the pulse signals is in direct proportion to the oil discharge amount. The PLC collects and accumulates the pulse signals sent by the flowmeter. When the oil discharge amount reaches a set value (pulse accumulation amount), the PLC drives the stepping motor to rotate, the sampling piston acts, the sampling is completed quickly, and the sampling amount is constant every time. In the whole sampling process, the sample outlet of the automatic sampler for oil unloading and sampling of the oil tank truck and the oil unloading pipeline are always isolated, so that the sampling tightness is ensured.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a tank wagon sample of unloading is with autosampler, at least one tank wagon sample of unloading is with autosampler through sample piston device with unload the oil pipe line and be connected, it unloads the hydraulic fluid port with the tank wagon and is connected to unload the oil pipe line, tank wagon sample of unloading is with autosampler includes: the device comprises an operation unit, a control unit, a detection unit and an execution unit; wherein the content of the first and second substances,
the operation unit is used for completing the operations of parameter setting, running and stopping, data display and the like of the automatic sampler for oil unloading and sampling of the oil tank truck;
the detection unit is used for detecting an oil discharge quantity signal which is in direct proportion to the oil discharge quantity when the oil tank truck discharges oil and sending the oil discharge quantity signal to the control unit;
the control unit is used for receiving the oil discharge amount signal (pulse) sent by the detection unit, when the oil discharge amount signal reaches a set value (pulse accumulated amount), the control unit drives the stepping motor of the execution unit to rotate quantitatively according to the sampling parameters set by the operation unit to complete sampling operation, the accumulated oil discharge amount signal is cleared, and sampling enters the next period;
the execution unit is used for controlling the stepping motor connected with the execution unit to rotate quantitatively based on the control unit, so that the sampling piston device connected with the stepping motor is driven to stretch and retract to finish quantitative sampling, the sampling piston device finishes sampling by stretching the front-end annular notch section into the oil unloading pipeline, the front-end annular notch section is aligned to the sample outlet at the bottom of the sampling piston device during contraction and stays for 0.5 second, an oil sample flows out along the sample outlet, and the sample outlet is isolated from the oil unloading pipeline by the front-end annular notch section.
Further, the operation unit is composed of a touch screen, and the parameter setting includes, but is not limited to, sampling frequency (how much oil is discharged to take one sample), sampling speed and/or sampler temperature.
Furthermore, the detection unit is composed of a flowmeter capable of outputting pulse signals, and comprises a liquid flowmeter directly connected with the oil discharge pipeline or a gas flowmeter connected with the air inlet of the oil tank truck, and the pulse signals output by the flowmeter are in direct proportion to the oil discharge quantity.
Furthermore, the control unit is composed of a Programmable Logic Controller (PLC), the input end of the control unit is connected with the operation unit, and the output end of the control unit is connected with the detection unit and is responsible for collecting pulse signals generated by the detection unit and indirectly calculating the oil discharge amount.
Furthermore, the execution unit consists of a stepping motor, a sampling piston device and a sampling pipeline;
the input end of the stepping motor is connected with the control unit through the stepping driver, the output end of the stepping motor is connected with the sampling piston device, the sampling piston device is connected with the vertical sampling pipeline, and when the oil tank truck unloads oil, fluid in the oil unloading pipeline vertically enters the sampling pipeline from bottom to top and then enters the oil unloading pool filter.
Further, the front ring annular gap section of the sampling piston device comprises an outer wall and an annular gap section;
the outer wall is fixedly arranged in a vertical sampling pipeline in the oil unloading pipeline;
the annular notch section comprises a sealing part, a sampling part and a connecting part which are concentrically arranged and sequentially connected; the closed part is arranged at the end part of the outer wall and is attached to the outer wall; the sampling part is used for storing an oil sample, the outer diameter of the sampling part is smaller than that of the sealing part, and the lengths of the sealing part and the sampling part and the outer diameter difference of the sampling part and the sealing part are set based on the oil sample amount, the sample outlet position and the sample outlet size; the connecting part is the same as the outer diameter of the sealing part, is attached to the outer wall and is connected with the stepping motor.
Further, the structure that connecting portion and the external diameter of sealing are the same and with outer wall laminating and be connected with step motor specifically includes:
the connecting portion is internally provided with a hollow structure, the inner wall of the hollow structure is provided with a screw thread, a screw rod is arranged on the rotating shaft of the stepping motor, the stepping motor rotates the screw rod to screw into the screw thread inside the connecting portion, when the stepping motor rotates, the front end annular notch section of the sampling piston device is made to do telescopic motion through connection of the screw rod, and the motion rate is controlled by the control unit.
The beneficial effects of the invention are:
the invention is controlled by a programmable controller and operates on a touch screen. The programmable controller controls the stepping motor to rotate by collecting the flow meter pulse signal associated with the oil discharging quantity, and the rotation of the stepping motor drives the sampling piston device to move rapidly to complete the sampling action. The front end annular gap section of the sampling piston device comprises an outer wall and an annular gap section, the annular gap section is filled with oil in a sampling pipeline, during sampling, the annular gap section moves towards the direction of the sample outlet, and the sampling part stops moving and stays for a certain time when aligning to the sample outlet, so that an oil sample flows out along the sample outlet. Then the annular gap section quickly enters the sampling pipeline to wait for next sampling. The automatic sampler for oil discharge sampling of the oil tank truck realizes the corresponding relation between the oil discharge amount and the sampling times.
The sampling frequency (how many liters of oil is unloaded to take one sample), the sampling speed (the time for completing one sampling) and some driving parameters of the stepping motor can be modified through the touch screen. And parameters such as sampling times, oil discharge quantity, temperature of the sampler and the like are displayed on the touch screen in real time.
The device is suitable for oil unloading sampling of an oil unloading point of an oil and gas production unit, in particular to an oil unloading system needing closed oil unloading.
The invention introduces the crude oil flowing out of the oil tank truck into the vertical sampling pipeline of the oil unloading pipeline provided with the automatic sampler for oil unloading and sampling of the oil tank truck. After oil discharge is started, the flowmeter rotates to send out pulse signals, and the number of the pulse signals is in direct proportion to the oil discharge amount. The PLC collects and accumulates the pulse signals sent by the flowmeter. When the oil discharge amount reaches a set value (pulse accumulation amount), the PLC drives the stepping motor to rotate, the sampling piston acts, the sampling is completed quickly, and the sampling amount is constant every time. In the whole sampling process, the sample outlet of the automatic sampler for oil unloading and sampling of the oil tank truck and the oil unloading pipeline are always isolated, so that the sampling tightness is ensured.
Drawings
FIG. 1 is a schematic diagram of the automatic sampler for oil discharge sampling of the oil tank truck.
FIG. 2 is a sampling state diagram of the automatic sampler for oil discharge sampling of the oil tank truck.
FIG. 3 is a schematic diagram of a start-up window of a touch screen display provided by the present invention.
Fig. 4 is a schematic view of an operation window displayed on a touch screen according to the present invention.
Fig. 5 is a schematic diagram of a parameter setting window displayed on a touch screen according to the present invention.
Fig. 6 is a schematic diagram of a functional operation window displayed on a touch screen according to the present invention.
FIG. 7 is a schematic view showing the connection between the automatic sampling device for oil discharge and sampling of the tank wagon and the tank wagon.
Detailed Description
As shown in fig. 1-2, an embodiment of the present invention provides an automatic sampler for oil discharge sampling of a tank wagon, wherein at least one automatic sampler for oil discharge sampling of a tank wagon is connected to an oil discharge pipeline through a sampling piston device, the oil discharge pipeline is connected to an oil discharge port of the tank wagon, and the automatic sampler for oil discharge sampling of a tank wagon comprises: the device comprises an operation unit, a control unit, a detection unit and an execution unit; wherein the content of the first and second substances,
the operation unit is used for completing the operations of parameter setting, running and stopping, data display and the like of the automatic sampler for oil unloading and sampling of the oil tank truck;
the detection unit is used for detecting an oil discharge quantity signal which is in direct proportion to the oil discharge quantity when the oil tank truck discharges oil and sending the oil discharge quantity signal to the control unit;
the control unit is used for receiving the oil discharge amount signal (pulse) sent by the detection unit, when the oil discharge amount signal reaches a set value (pulse accumulated amount), the control unit drives the stepping motor of the execution unit to rotate quantitatively according to the sampling parameters set by the operation unit to complete sampling operation, the accumulated oil discharge amount signal is cleared, and sampling enters the next period;
the execution unit is used for controlling the stepping motor connected with the execution unit to rotate quantitatively based on the control unit, so that the sampling piston device connected with the stepping motor is driven to stretch and retract to finish quantitative sampling, the sampling piston device stretches into the oil unloading pipeline through the front-end annular notch section to finish sampling, the front-end annular notch section is aligned to the sample outlet at the bottom of the sampling piston device during contraction, so that an oil sample flows out along the sample outlet, and the sample outlet is isolated from the oil unloading pipeline.
Further, the operation unit is composed of a touch screen, and the parameter setting includes, but is not limited to, sampling frequency (how many liters of oil is unloaded to take one sample), sampling speed and/or sampler temperature.
Furthermore, the detection unit is composed of a flowmeter capable of outputting pulse signals, and comprises a liquid flowmeter directly connected with the oil discharge pipeline or a gas flowmeter connected with the air inlet of the oil tank truck, and the pulse signals output by the flowmeter are in direct proportion to the oil discharge quantity.
Furthermore, the control unit is composed of a Programmable Logic Controller (PLC), the input end of the control unit is connected with the operation unit, and the output end of the control unit is connected with the detection unit and is responsible for collecting pulse signals generated by the detection unit and indirectly calculating the oil discharge amount.
Furthermore, the execution unit consists of a stepping motor, a sampling piston device and a sampling pipeline; the input end of the stepping motor is connected with the control unit through the stepping driver, the output end of the stepping motor is connected with the sampling piston device, the sampling piston device is connected with the vertical sampling pipeline, and when the oil tank truck unloads oil, fluid in the oil unloading pipeline vertically enters the sampling pipeline from bottom to top and then enters the oil unloading pool filter.
Further, the front ring annular gap section of the sampling piston device comprises an outer wall and an annular gap section;
the outer wall is fixedly arranged in a vertical sampling pipeline in the oil unloading pipeline;
the annular notch section comprises a sealing part, a sampling part and a connecting part which are concentrically arranged and sequentially connected, and the sealing part is arranged at the end part of the outer wall and is attached to the outer wall; the sampling part is used for storing an oil sample, the outer diameter of the sampling part is smaller than that of the sealing part, and the lengths of the sealing part and the sampling part and the outer diameter difference of the sampling part and the sealing part are set based on the oil sample amount, the position of the sample outlet and the size of the sample outlet; the connecting part is the same as the outer diameter of the sealing part, is attached to the outer wall and is connected with the stepping motor.
The structure that connecting portion are the same with the external diameter of sealing and with outer wall laminating and be connected with step motor specifically includes:
the connecting portion is internally provided with a hollow structure, the inner wall of the hollow structure is provided with a screw thread, a screw rod is arranged on the rotating shaft of the stepping motor, the stepping motor rotates the screw rod to screw into the screw thread inside the connecting portion, when the stepping motor rotates, the front end annular notch section of the sampling piston device is made to do telescopic motion through connection of the screw rod, and the motion rate is controlled by the control unit.
For example, when oil is unloaded, oil in the oil tank truck enters an oil unloading pipeline for installing an automatic sampler for oil unloading and sampling of the oil tank truck, the outer wall of the sampling piston device is fixedly installed in the sampling pipeline of the oil unloading pipeline, so that the annular notch section is always positioned in the vertical sampling pipeline in the oil unloading pipeline, the volume of the annular notch section in the annular notch section at the front end of the sampling piston device is the sampling amount each time, and the sampling amount can be changed by replacing the annular notch section. The PLC collects and accumulates pulse signals transmitted by the flowmeter, when the pulse quantity reaches a set value (the flowmeter flows through a certain volume), the PLC drives the stepping motor to rotate, the annular notch section moves towards the sample outlet, the piston stops moving and stays for 0.2-1 second when the sampling part is aligned with the sample outlet, the time of the embodiment is preferably 0.5 second (the time can be set according to actual conditions), and the oil sample flows out of the sample outlet. Then the annular gap section quickly enters the sampling pipeline to wait for the next sampling to drive the annular gap section to move, and then the quantitative sampling is finished. Then the accumulated pulse quantity of the PLC is cleared, the next pulse acquisition is carried out again, and the sampling enters the next period. When the oil tank truck just starts to unload oil, the oil unloading speed is high, and the quantity of the PLC pulse meters can quickly reach a set value. As the oil discharge progresses, the flow rate of the oil decreases and the sampling operation interval also increases.
The invention has the beneficial effects that:
the invention is controlled by a programmable controller and operates on a touch screen. The programmable controller controls the stepping motor to rotate by collecting the flow meter pulse signal associated with the oil discharging quantity, and the rotation of the stepping motor drives the sampling piston device to move rapidly to complete the sampling action. The front end annular gap section of the sampling piston device comprises an outer wall and an annular gap section, the annular gap section is filled with oil in a sampling pipeline, during sampling, the annular gap section moves towards the direction of the sample outlet, and the sampling part stops moving and stays for a certain time when aligning to the sample outlet, so that an oil sample flows out along the sample outlet. Then the telescopic annular closed section quickly enters the sampling pipeline to wait for next sampling. The automatic sampler for oil discharge sampling of the oil tank truck realizes the corresponding relation between the oil discharge amount and the sampling times.
The sampling frequency (how many liters of oil are discharged to take one sample), the sampling speed (the time for completing one sampling) and some driving parameters of the stepping motor can be modified through the touch screen. And parameters such as sampling times, oil discharge quantity, temperature of the sampler and the like are displayed on the touch screen in real time.
The device is suitable for oil unloading sampling of an oil unloading point of an oil and gas production unit, in particular to an oil unloading system needing closed oil unloading.
The invention introduces the crude oil flowing out of the oil tank truck into the vertical sampling pipeline of the oil unloading pipeline provided with the automatic sampler for oil unloading and sampling of the oil tank truck. After oil discharge is started, the flowmeter rotates to send out pulse signals, and the number of the pulse signals is in direct proportion to the oil discharge amount. The PLC collects and accumulates the pulse signals sent by the flowmeter. When the oil discharge amount reaches a set value (pulse accumulation amount), the PLC drives the stepping motor to rotate, the sampling piston acts, the sampling is completed quickly, and the sampling amount is constant every time. In the whole sampling process, the sample outlet of the automatic sampler for oil unloading and sampling of the oil tank truck and the oil unloading pipeline are always isolated, so that the sampling tightness is ensured.
To illustrate the principles of the present invention in detail, a specific application example is given in which all operations of an autosampler for tank wagon oil discharge sampling are performed on a 7 inch touch screen, which is mainly a window as shown in fig. 3 to 6.
1. Start window
As shown in fig. 3, it is a welcome interface, which introduces information such as development organization of the oil-unloading automatic sampler of the tank car and the telephone for reporting obstacles. The window automatically jumps to the operating window after 3 seconds of display.
2. Operating window
As shown in fig. 4, the start-stop operation of the two controlled samplers and the display of some common parameters, including the temperature of the sampler, the number of times of sampling, the amount of discharged oil, etc., can be completed in the operation window, and the working state of the sampler heater is also displayed.
3. Setting window
As shown in fig. 5, this window is where various parameters of the sampler are set. Including the frequency of sampling (how many liters of oil are removed for sampling), the number of pulses emitted by the flow meter flowing 100 liters, the temperature of the sampler, etc. The modification can be made by touching the screen with a finger.
4. Function operation
As shown in fig. 6, the window for technicians to debug can be changed by changing the parameters of the window, such as the rotation speed, the stroke, the off-line state, the forward and reverse rotation of the motor. The window is password protected.
As shown in fig. 7, after the oil unloading is finished, the automatic sampler for oil unloading and sampling of the oil tank truck stops sampling, and an operator takes the sample to test the water content and calculates the oil quantity according to the weight of the oil tank truck before and after the oil unloading.
The beneficial effects of the invention are:
the invention introduces the crude oil flowing out of the oil tank truck into the vertical sampling pipeline of the oil unloading pipeline provided with the automatic sampler for oil unloading and sampling of the oil tank truck. After oil discharge is started, the flowmeter rotates to send out pulse signals, and the number of the pulse signals is in direct proportion to the oil discharge amount. The PLC collects and accumulates the pulse signals sent by the flowmeter. When the oil discharge amount reaches a set value (pulse accumulation amount), the PLC drives the stepping motor to rotate, the sampling piston device acts to quickly finish sampling, and the sampling amount is constant every time. In the whole sampling process, the sample outlet of the automatic sampler for oil unloading and sampling of the oil tank truck and the oil unloading pipeline are always isolated, so that the sampling tightness is ensured.
The automatic sampler for oil unloading and sampling of the oil tank truck is controlled by a programmable controller and operated by a touch screen. The programmable controller controls the stepping motor to rotate at equal intervals by acquiring an oil unloading signal, drives the sampling piston to move rapidly, and finishes the sampling action. The oil discharge amount and the sampling times are corresponding. Meanwhile, the programmable controller can control the temperature of the sampler and ensure that the temperature of the sampler is basically constant.
The sampling frequency (how many more samples are taken for oil discharge), the sampling speed, the temperature of the sampler and some driving parameters of the stepping motor can be modified through the touch screen. And parameters such as sampling times, oil discharge quantity, temperature of the sampler and the like are displayed on the touch screen in real time.
The device is suitable for oil unloading sampling of an oil unloading point of an oil and gas production unit, in particular to an oil unloading system needing closed oil unloading.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. The utility model provides a tank wagon sample of unloading is with autosampler, at least one tank wagon sample of unloading is with autosampler through sample piston device and unload the oil pipe line and be connected, it unloads the hydraulic fluid port with the tank wagon and is connected its characterized in that, tank wagon sample of unloading is with autosampler includes: the device comprises an operation unit, a control unit, a detection unit and an execution unit; wherein the content of the first and second substances,
the operation unit is used for completing parameter setting, operation and stop and/or data display operation of the automatic sampler for oil unloading and sampling of the oil tank truck;
the detection unit is used for detecting an oil discharge quantity signal which is in direct proportion to the oil discharge quantity when the oil tank truck discharges oil and sending the oil discharge quantity signal to the control unit;
the control unit is used for receiving the oil discharge amount signal sent by the detection unit, when the oil discharge amount signal reaches a set value, the control unit drives the stepping motor of the execution unit to rotate quantitatively according to the sampling parameters set by the operation unit, so as to drive the sampling piston to stretch and retract once, complete one sampling operation, clear the accumulated oil discharge amount signal, and sample the oil into the next period;
the execution unit is used for controlling the stepping motor connected with the execution unit to rotate quantitatively based on the control unit so as to drive the sampling piston device connected with the stepping motor to stretch and retract to finish quantitative sampling, the sampling piston device finishes sampling by stretching the front-end annular notch section into the oil unloading pipeline, the front-end annular notch section is aligned to the sample outlet at the bottom of the sampling piston device during contraction, the front-end annular notch section stays at the position for 0.2-1 second to enable an oil sample to flow out along the sample outlet, and the sample outlet is isolated from the oil unloading pipeline by the front-end annular notch section;
the front end annular notch section of the sampling piston device comprises an outer wall and an annular notch section;
the outer wall is fixedly arranged in a vertical sampling pipeline in the oil unloading pipeline;
the annular notch section comprises a sealing part, a sampling part and a connecting part which are concentrically arranged and sequentially connected; the closed part is arranged at the end part of the outer wall and is attached to the outer wall; the sampling part is used for storing an oil sample, the outer diameter of the sampling part is smaller than that of the sealing part, and the lengths of the sealing part and the sampling part and the outer diameter difference of the sampling part and the sealing part are set based on the oil sample amount, the sample outlet position and the sample outlet size; the connecting part and the sealing part have the same outer diameter, are attached to the outer wall and are connected with the stepping motor;
the structure that connecting portion are the same with the external diameter of sealing and with outer wall laminating and be connected with step motor specifically includes:
the connecting portion is internally provided with a hollow structure, the inner wall of the hollow structure is provided with a screw thread, a screw rod is arranged on the rotating shaft of the stepping motor, the stepping motor rotates the screw rod to screw into the screw thread inside the connecting portion, when the stepping motor rotates, the front end annular notch section of the sampling piston device is made to do telescopic motion through connection of the screw rod, and the motion rate is controlled by the control unit.
2. The automatic sampler for oil discharge sampling of the oil tank truck as claimed in claim 1, characterized in that the operation unit is composed of a touch screen, and the parameter settings include but are not limited to sampling frequency, sampling speed and/or sampler temperature.
3. The automatic sampler for sampling the oil discharged from the oil tanker according to claim 1, wherein the detection unit is composed of a flow meter capable of outputting a pulse signal, and the flow meter comprises a liquid flow meter directly connected to the oil discharging pipeline or a gas flow meter connected to the air inlet of the oil tanker, and the pulse signal output by the flow meter is proportional to the oil discharging quantity.
4. The automatic sampler for oil discharge sampling of the oil tank truck as claimed in claim 1, wherein the control unit is composed of a Programmable Logic Controller (PLC), the input end of the control unit is connected with the operation unit, and the output end of the control unit is connected with the detection unit and is responsible for collecting the pulse signal generated by the detection unit and indirectly calculating the oil discharge amount.
5. The automatic sampler for oil unloading and sampling of the oil tank truck as claimed in claim 1, wherein the execution unit is composed of a stepping motor, a sampling piston device and a sampling pipeline;
the input end of the stepping motor is connected with the control unit through the stepping driver, the output end of the stepping motor is connected with the sampling piston device, the sampling piston device is connected with the vertical sampling pipeline, and when the oil tank truck unloads oil, fluid in the oil unloading pipeline vertically enters the sampling pipeline from bottom to top and then enters the oil unloading pool filter.
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| CN104406990A (en) * | 2014-11-06 | 2015-03-11 | 锦州锦研科技有限责任公司 | Automatic sealed oil-discharge device and oil-discharge method |
| CN208060215U (en) * | 2018-04-11 | 2018-11-06 | 西南石油大学 | A kind of continuous collecting apparatus of oil sample |
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