A sampling device suitable for petrochemical products

Abstract

The application discloses a sampling device suitable for petrochemical products, which comprises a sampling unit and a controller, wherein the sampling unit comprises a container and a lifter, one end of the container is connected to the lifter; the controller comprises a control system and a processing system; the control system controls the lifting and lowering of the lifter, the processing system monitors the displacement distance and speed of the lifter and calculates the depth of the liquid; the device has the advantages that the control system is used to control the lifting and lowering of the lifter, the processing system monitors the displacement distance and speed of the lifter and calculates the depth of the liquid, the liquid depth is intelligently measured, the sampling point is automatically positioned, automatic sampling is realized, the problems of poor sample representativeness, the tediousness of manual sampling and the working intensity are solved, the sampling position is quickly and accurately determined according to the data displayed by the processing system, and the sampled sample has high representativeness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sampling devices, in particular to a sampling device suitable for petrochemical products. BACKGROUND

[0002] In the quality control and trade delivery of petrochemical products, the representativeness of sampling plays a decisive role in the accuracy of density, moisture and other quality indicators. Therefore, the representativeness of sampling is very important and is also a key factor in evaluating sampling methods and sampling equipment. Among the sampling objects, crude oil is a mixture of various liquid hydrocarbons such as alkanes, cycloalkanes, aromatic hydrocarbons and olefins. Crude oil produced by different oil fields has different properties. Even in the same oil field, due to the difference of oil wells, the properties of crude oil may also differ. In addition, the presence of water that is insoluble in oil products, the phenomenon of unevenness of crude oil is prone to occur. In order to meet the use requirements of high-performance engines, gasoline, diesel and other petroleum products are blended according to specific product specification standards by using different proportions of raw materials. If the sequence of raw material addition is wrong or the stirring is not uniform, stratification and other unevenness may occur.

[0003] At present, China adopts GB / T 4756 "Petroleum Liquid Hand Sampling Method" and other sampling standards. Generally, the liquid level depth is measured first, then multi-point sampling is performed, and then the mixed sample is formed by mixing according to the weight to obtain a representative sample.

[0004] Most of the current enterprises adopt manual sampling, which has the problems of high work intensity, low efficiency, and sampling affected by external environmental factors, resulting in poor sample accuracy. SUMMARY

[0005] The main purpose of the present application is to provide a sampling device suitable for petrochemical products, so as to solve the problems of poor sample representativeness, complicated manual sampling and high work intensity in the prior art.

[0006] In order to achieve the above purpose, the present application provides a sampling device suitable for petrochemical products, which comprises a sampling unit, a controller and a lifting device. The sampling unit comprises a container and a lifting device, one end of the container is connected to the lifting device; the controller comprises a control system and a processing system; the control system controls the lifting of the lifting device and the lowering of the lifting device, and the processing system monitors the displacement distance and speed of the lifting device to calculate the depth of the liquid.

[0007] Further, the controller further comprises a driving motor and a power supply, the driving motor is powered by the power supply, one end of the driving motor is connected with one end of the lifter, and the other end of the lifter is movably connected with one end of the container. Turning on the power supply starts the driving motor, so that the driving motor drives the container on the lifter to ascend or descend, realizes automation, improves sampling efficiency, and reduces the strength of manual operation.

[0008] Further, the controller further comprises an inductor and a laser source, the inductor and the laser source are arranged on the controller, the laser source emits on the lifter, and the inductor feeds back the distance and speed of the lifter descending to the processing system. Through the combination of the laser source and the inductor, the distance and speed of the lifter descending are automatically and accurately fed back to the processing system, the automatic system calculates the liquid depth of the petrochemical product, and the sampling position is accurately determined, so that the representativeness of the sample is achieved.

[0009] Further, the lifter is a steel ruler with a scale, the laser source is arranged opposite the scale, and one end of the driving motor is fixedly provided with a rocker. The laser source is opposite the steel ruler with the scale, the inductor senses the number of scales of the steel ruler to calculate the descending distance, the design is ingenious, and the structure is simple. When manual sampling is needed, the ascending and descending of the lifter can be controlled by shaking the rocker, so that the application range of the sampling device is expanded.

[0010] Further, the sampling device further comprises a support, and the controller and the lifter are fixed on the support respectively. The controller and the lifter are fixed on the support respectively, so that the sampling device is convenient to carry.

[0011] Further, the container is provided with an outlet, an inlet, a sealing cover with an opening, an upper valve, a lower valve and a connecting rod, one end of the sealing cover is movably connected with one end of the outlet, the other end of the sealing cover is movably connected with the lifter, the upper valve and the lower valve are arranged at two ends of the connecting rod respectively, the upper valve controls the opening, and the lower valve controls the inlet. The container is opened or closed through the upper valve and the lower valve, so that the petrochemical product flows into the sample from the inlet and flows out of the air from the outlet. After sampling is completed, the upper valve and the lower valve close the container, and the sample can be temporarily stored.

[0012] Further, a buckle member is arranged on one end of the support, and a balance cylinder is buckled on the support by the buckle member, one end of the balance cylinder is fixedly connected to the sealing cover, and the other end of the balance cylinder is movably connected to the lifter. As a safety arrangement, the buckle member is manually opened, the balance cylinder and the container are lowered to take samples, and when the sampling is completed, the container is lifted with the lifter, the balance cylinder is lifted to the support, and the buckle member locks the balance cylinder. The balance cylinder balances the vertical state of the container during the lowering or lifting of the container, and facilitates the accurate positioning of the liquid level of the petrochemical product.

[0013] Further, a limiting spring limiting nut, a compression spring, a constant volume member, and a scale are arranged on the connecting rod, the lower valve, the constant volume member, the upper valve, the compression spring, the limiting nut, and the limiting spring are sequentially mounted on the connecting rod from bottom to top, the scale is arranged in the sealing cover, and the constant volume member is arranged on the sealing cover. The constant volume member is sleeved on the connecting rod, the amount of liquid in the container is controlled by the downward pulling distance of the constant volume member, the more the constant volume member is pulled downward, the more the enclosed air is, and the less the sampling amount in the container is, and vice versa, the internal capacity of the constant volume member is reflected by the scale, and therefore the container can set the required sampling amount as required, without the need to additionally prepare a metering container, and the volatilization of light components of the sample is reduced. The sampling mode is set by adjusting the distance between the limiting nut and the limiting spring. For example, when point sampling is performed, the limiting nut is adjusted downward, so that the limiting nut and the limiting spring reach a preset distance, the limiting spring does not generate resistance at the preset distance, and at this time, the upper valve and the lower valve are opened. If the bottom sample is taken, the limiting nut is adjusted upward, so that the limiting nut and the limiting spring are in close contact and reach a predetermined resistance, so that when the container is lowered in the liquid, the resistance generated by the container makes the upper valve and the lower valve closed. When the container reaches the bottom of the liquid, the constant volume member offsets the resistance of the limiting spring under the action of its own gravity, and the upper valve and the lower valve are opened, and the sample enters the container. Further, a gravity ring is arranged on the other end of the container, and a fan blade is arranged on the lower valve. The gravity ring is arranged to increase the gravity of the container, especially when the container is in a viscous petrochemical product, because the viscosity of the petrochemical product is high, the container is lowered slowly, and the gravity ring increases the lowering speed of the container. When the container is lowered, the fan blade rotates to stir the petrochemical product in the container, so that the petrochemical product is uniformly stirred, and the obtained sample is well representative.

[0014] Further, the support includes an upper support and a lower support, the power supply and the lifter are fixed to the upper support, the controller is fixed to the lower support, and the upper support and the lower support are fixedly connected. The support is divided into the upper support and the lower support, and the upper support and the lower support are fixedly connected by screws. The structure is clear, and the processing and installation are convenient.

[0015] Further, a scraping blade is fixed to the bottom of the upper support, and a ring brush is fixed to the bottom of the lower support. The scraping blade and the ring brush are arranged to scrape off the petrochemical product on the steel ruler in layers, so as to avoid the influence of the oil on the steel ruler on displacement measurement, and the control system can sense the displacement speed of the lifter scale, and real-time monitor the speed and distance of the lifter, and intelligently calculate the liquid depth.

[0016] Further, a display screen and buttons are arranged on the controller, the buttons are used to select various function modes, and the display screen displays data and sampling states. The container is provided with three layers, the middle layer is a heat preservation layer, the heat preservation layer adopts a vacuum structure, and a Teflon coating is sprayed on the outer layer and / or the inner layer. The middle layer of the container is the heat preservation layer, which plays a heat preservation role, adopts a vacuum structure, and the container is light in weight. The Teflon coating is sprayed on the outer layer and / or the inner layer, so as to prevent the sample from adhering to the inside and outside of the container, facilitate cleaning, and reduce the working time for cleaning the container.

[0017] Further, the container is a cylinder, and a fixing rod is arranged on the lower support. When sampling, the fixing rod is placed at the sampling opening, so as to relieve the fatigue of the operator. When manually operating, the fixing rod is convenient for manual gripping.

[0018] Compared with the prior art, the control system is arranged to control the lifting and lowering of the lifter, the processing system is arranged to monitor the displacement distance and speed of the lifter and calculate the liquid depth, the automatic sampling of the liquid depth is realized, the problems of complexity and working intensity of manual sampling are solved, the sampling position is quickly and accurately determined according to the data displayed by the processing system, and the representativeness of the sample is ensured. The container can be provided with the required sampling amount as required, and there is no need to additionally prepare a metering container, and the volatilization of light components of the sample is reduced. The container is provided with a sealing function, and can temporarily store the sample. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, make an explanation of the application, and do not constitute an improper limitation of the application. In the drawings:

[0020] Figure 1 It is an exploded view of the sampling device of the embodiment of the application;

[0021] Figure 2 It is a sectional view of the sampling device of the embodiment of the application

[0022] Figure 3 It is a sampling process of the liquid bottom of the sampling device of the embodiment of the application;

[0023] Figure 4The liquid fixed-point sampling process of the sampling device of the embodiment of the present application;

[0024] The above drawings include the following drawing identifiers:

[0025] The sampling unit 1, the container 11, the outlet 111, the inlet 112, the sealing cover 113, the upper valve 114, the lower valve 115, the connecting rod 116, the limiting spring 117, the limiting nut 118, the compression spring 119, the constant-volume element 120, the gravity ring 121, the fan blade 122, the lifter 12, the controller 2, the driving motor 21, the rocker 211, the display screen 22, the button 23, the bracket 3, the buckle 31, the balance cylinder 32, the upper bracket 33, the lower bracket 34, the scraping blade 35, the ring brush 36, and the fixing rod 37. DETAILED DESCRIPTION

[0026] The sampling device suitable for petrochemical products is provided in the embodiment of the present application to solve the problems of poor sample representativeness, complicated manual sampling, and high work intensity in the prior art.

[0027] The technical solution in the embodiment of the present application is to solve the problems of complicated manual sampling, high work intensity, and poor sample accuracy, and the general idea is as follows:

[0028] The control system is configured to control the lifting and lowering of the lifter 12, and the processing system is configured to monitor the displacement distance and speed of the lifter 12 and calculate the depth of the liquid, so as to realize intelligent measurement of the liquid depth, automatic positioning of the sampling point, and automatic sampling. The problems of poor sample representativeness, complicated manual sampling, and high work intensity are solved. The sampling position is quickly and accurately determined according to the data displayed by the processing system, and the sampled sample has high representativeness. The container 11 can be configured to have the required sampling amount, and there is no need to additionally prepare a metering container 11, and the volatilization of light components of the sample is reduced. The container 11 has a self-closing function and can temporarily store the sample.

[0029] The technical solution in the embodiment of the present application will be described clearly and completely in combination with the drawings in the embodiment of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] As Figure 1 and 2As shown, a kind of sampling device suitable for petrochemical product, including sampling unit 1, controller 2 and support 3, sampling unit 1 includes container 11 and lifter 12, one end of container 11 is connected on lifter 12;Controller 2 includes control system and processing system;Control system controls the rising and falling of lifter 12, and processing system monitors the displacement distance and speed of lifter 12 to calculate the depth of liquid;Controller 2 and lifter 12 are fixed on support 3 respectively;Container 11 is the shape of cylinder, container 11 is arranged in three layers, the middle layer is insulation layer, and the insulation layer adopts vacuum structure;Special Teflon coating is sprayed on the outer layer or / and inner layer.

[0031] In specific implementation, controller 2 further includes driving motor 21, power supply, inductor (not shown in the figure), laser source (not shown in the figure), display screen 22 and button 23, driving motor 21 is powered by power supply, one end driven by driving motor 21 is connected with one end of lifter 12, and the other end of lifter 12 is movably connected with one end of balance cylinder 32 of container 11;Inductor and laser source are arranged on control system, laser source emits on lifter 12, and inductor feeds back the distance and speed of lifter 12 descending to processing system.

[0032] In specific implementation, lifter 12 is steel ruler with scale, laser source is arranged opposite to scale, and one end of driving motor 21 is fixedly provided with rocker 211.

[0033] In specific implementation, container 11 is provided with outlet 111, inlet 112, sealing cover 113 with opening, upper valve 114, lower valve 115 and connecting rod 116, one end of sealing cover 113 is movably connected to the upper end of container, the other end of sealing cover 113 is movably connected to lifter 12, upper valve 114 and lower valve 115 are arranged at two ends of connecting rod 116 respectively, upper valve 114 controls opening, and lower valve 115 controls inlet 112.

[0034] In specific implementation, one end of support 3 is provided with buckle piece 31 and balance cylinder 32, buckle piece 31 buckles balance cylinder 32 on support 3, one end of balance cylinder 32 is fixedly connected to sealing cover 113, and the other end of balance cylinder 32 is movably connected to lifter 12.

[0035] In specific implementation, limiting spring 117, limiting nut 118, compression spring 119, constant-volume element 120 and scale (not shown in the figure) are arranged on connecting rod 116, in sequence from bottom to top, lower valve 115, constant-volume element 120, upper valve 114, compression spring 119 and limiting nut 118 are mounted on connecting rod 116, scale is arranged on sealing cover 113, and constant-volume element 120 is arranged on sealing cover 113.

[0036] In the embodiment, the other end of the container 11 is provided with a gravity ring 121, and the lower valve 115 is provided with a fan blade 122.

[0037] In the embodiment, the support 3 includes an upper support 33 and a lower support 34, the power supply and the lifter 12 are fixed on the upper support 33, the controller 2 is fixed on the lower support 34, and the upper support 33 and the lower support 34 are fixedly connected by screws. The lower support 34 is provided with a fixing rod 37.

[0038] In the embodiment, the lifter is sleeved with a scraper 35 and a ring brush 36, the scraper 35 is fixed on the bottom of the upper support 33, and the ring brush 36 is fixed on the bottom of the lower support 34.

[0039] The sampling method of the sampling device in the embodiment is as follows:

[0040] As shown in the drawing, Figure 3 the sampling process at the bottom of the liquid is as follows: first, check the state of the container 11, adjust the constant volume part 120, set the required single sampling amount, and then adjust the limiting nut 118 and block the limiting spring 117, and then place the fixing frame at the sampling port of the cabin or the oil tank. Turn on the controller 2, the control system performs self-checking, sets zero, selects the sampling method and the sampling point. Press the start button, the instrument screen displays the opening of the buckle part 31, manually open the buckle part 31, the container 11 falls under the action of gravity, and after the action force of the driving motor 21 reaches the balance, the container 11 uniformly falls, the inductor measures the displacement distance and speed of the steel ruler, and displays V n on the screen, reaches the liquid surface and is resisted by the liquid, the speed decreases, the instrument recognizes that the liquid surface is reached and is set as L1. The container 11 continues to fall under the action of gravity, the container 11 reaches the bottom of the cabin or the oil tank, the speed decreases to 0, the display screen 22 displays that the container 11 reaches the bottom of the liquid and is set as L2, the liquid depth is (L2-L1), the display screen 22 displays the liquid depth, and the confirmation button is pressed to confirm. The liquid enters the container 11, the container 11 is stationary for 10 s, the driving motor 21 starts to lift the container 11 to zero, the buckle part 31 clamps the balance cylinder 32, the sampler alarms and prompts to pour out the sample, the limiting nut 118 is manually pulled up, the sample is placed in the mixing container, the screen displays that the sampling is completed, and the confirmation button is clicked to complete the sampling.

[0041] As shown in the drawing, Figure 4The sampling process of liquid fixed point is shown. First, check the state of the container 11, adjust the constant volume member 120, set the required single sampling volume, and lower the limiting screw cap 118 to keep a distance from the limiting spring 117, then place the fixed frame at the sampling port of the cabin or oil tank. Open the controller 2, the control system performs self-checking, sets zero position, selects sampling method and selects point sampling. Press the start button, the instrument screen displays the opening of the buckle member 31, after manually opening the buckle member 31, the container 11 falls under the action of gravity, and after the action force of the drive motor 21 reaches balance, the container 11 descends at a constant speed, the inductor measures the displacement distance and speed of the steel ruler, and displays V n on the screen. When reaching the liquid surface, the speed will decrease due to the resistance of the liquid, and the instrument will identify it as reaching the liquid surface and set it as L1. The container 11 continues to descend under the action of gravity, and the container 11 reaches the bottom of the cabin or oil tank, the speed is reduced to 0, and the display screen 22 displays that the container 11 reaches the bottom of the liquid, which is set as L2, and the liquid depth is (L2-L1), which is displayed on the display screen 22. Confirm by pressing the confirmation button. Under the drive of the drive motor 21, the container 11 rises to the lower sampling point

L1+5 / 6(L2-L1)

L1+1 / 2(L2-L1)

L1+1 / 6(L2-L1)

[0042] The formula for calculating the liquid level height of the liquid is as follows:

[0043] The steel ruler's scale is set at 10mm intervals, with the distance between the first scale line and the zero point being L0. The timing is set to t.

[0044] Signal accumulation n = SigNum,

[0045] Real-time distance L n =n*10+L0,

[0046] Real-time speed V n ,

[0047] The velocities V of the first three signal points n-1 V n-2 V n-3 ,

[0048] Front average speed =(Vn-1 + Vn-2 + Vn-3 ) / 3 (if n≤3, Vn-1=Vn-2=Vn-3=Vn)

[0049] Liquid surface point L1,

[0050] Bottom point L2,

[0051] Calculate the liquid level height L = L2 - L1;

[0052] If Vn < ( *75%) indicates that the liquid surface point L1=Ln has been reached; if Vn=0, the bottom of container 11 L2=Ln has been reached.

[0053] Calculate the liquid level height L = L2 - L1.

[0054] The formula for calculating conventional sampling points is:

[0055] The upper sampling point 1 is (L1+L / 6).

[0056] The program condition is IF((L1+L / 6)*95%)≤Ln≤((L1+L / 6)*105%).

[0057] Sampling point 2 in the middle is L1+L / 2)

[0058] The program condition is IF((L1+L / 2)*95%)≤Ln≤((L1+L / 2)*105%).

[0059] The lower sampling point 3 is (L1 + L*5 / 6).

[0060] The program condition is IF((L1+L*5 / 6)*95%)≤Ln≤((L1+L*5 / 6)*105%).

[0061] For example, when the light source emitted by the laser source irradiates on the steel ruler, due to the scale line on the steel ruler, the reflection occurs with light and dark changes, the inductor receives the change signal and carries out accumulation.

[0062] After the buckle 31 is opened, the container 11 falls under the action of gravity, and finally falls at a speed of 1.5 m / s due to the resistance of the driving motor 21. When the container 11 reaches the liquid surface, the falling speed is reduced to 0.8 m / s due to the resistance of the liquid surface, and the number of signals received by the inductor is 1230. The distance L1 from the zero point of the cabin or oil tank to the liquid surface (empty distance) is [1230×1 cm (the distance between two signal points)+36 cm (the distance between the bottom of the sampler container 11 and the zero point of the cabin or oil tank) =1266 cm =12.66 m].

[0063] When the container 11 reaches the bottom of the cabin or oil tank, the speed is reduced to 0 m / s, and the total number of signals received by the inductor is 3130. The distance L2 from the zero point of the cabin or oil tank to the bottom is [3123×1 cm (the distance between two signal points)+36 cm (the distance between the bottom of the sampler container 11 and the zero point of the cabin or oil tank) =3159 cm =31.59 m], and the liquid depth is L2-L1=31.59-12.66=18.93 m.

[0064] It should be noted that the terms "first", "second", and the like in the specification and claims of the application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0065] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, substitution, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A sampling device suitable for use with petrochemical products, characterized in that, The sampling device comprises: a sampling unit comprising a container and a lifter, one end of the container being connected to the lifter; a controller comprising a control system and a processing system; the control system controls the lifting and lowering of the lifter, the processing system monitors the displacement distance and speed of the lifter and calculates the depth of the liquid, and controls the sampling of the container at the upper, middle and bottom of the liquid; the controller further comprises a sensor and a laser source, the sensor and the laser source being arranged on the control system, the laser source being arranged on the lifter, and the sensor feeding back the distance and speed of the lowering of the lifter to the processing system; the lifter is a steel ruler with a scale, and the laser source is arranged opposite the scale; the container is lowered at a constant speed, the sensor measures the displacement distance and speed of the steel ruler, and when the container reaches the surface of the liquid, the speed will decrease due to the resistance of the liquid, and the instrument will identify that the liquid surface has been reached; the container continues to fall under the action of gravity, and the speed of the container reaching the bottom of the cabin or tank is 0; The container is provided with an outlet, an inlet, a sealed cover with an opening, an upper valve, a constant volume element, a lower valve and a connecting rod, the lower valve, the constant volume element and the upper valve are sequentially arranged on the connecting rod from bottom to top, the upper valve and the lower valve are respectively arranged at both ends of the connecting rod, the upper valve controls the opening, and the lower valve controls the inlet.

2. A sampling device suitable for use with petrochemical products according to claim 1, wherein, The controller further comprises a driving motor and a power supply, the driving motor is powered by the power supply, one end of the driving motor is connected to one end of the lifter, a rocker is fixedly arranged on one end of the driving motor, and the other end of the lifter is movably connected to one end of the container.

3. A sampling device suitable for use with petrochemical products according to claim 2, wherein, The sampling device further comprises a support, and the controller and the lifter are respectively fixed on the support.

4. A sampling device suitable for use with petrochemical products according to claim 3, wherein, One end of the sealed cover is movably connected to one end of the container, and the other end of the sealed cover is movably connected to the lifter.

5. A sampling device suitable for use with petrochemical products according to claim 4, wherein, A buckle element and a balance cylinder are arranged on one end of the support, the buckle element buckles the balance cylinder on the support, one end of the balance cylinder is fixedly connected to the sealed cover, and the other end of the balance cylinder is movably connected to the lifter.

6. A sampling device suitable for use with petrochemical products according to claim 5, wherein, A limiting spring, a limiting nut, a compression spring and a scale are arranged on the connecting rod, the lower valve, the constant volume element, the upper valve, the compression spring, the limiting nut and the limiting spring are sequentially arranged on the connecting rod from bottom to top, one end of the connecting rod is fixedly connected to one end of the balance cylinder, the constant volume element is arranged on the sealed cover, and the scale is arranged in the sealed cover.

7. A sampling device suitable for use with petrochemical products according to claim 6, wherein, A gravity ring is arranged on the other end of the container, and a fan blade is arranged on the lower valve.

8. A sampling device suitable for use with petrochemical products according to claim 7, wherein, The support comprises an upper support and a lower support, the power supply and the lifter are fixed on the upper support, the controller is fixed on the lower support, and the upper support and the lower support are screw-fixedly connected.

9. A sampling device suitable for use with petrochemical products according to claim 8, wherein, A scraper and a ring brush are arranged on the other end of the lifter, the scraper is fixed to the bottom of the upper support, and the ring brush is fixed to the bottom of the lower support.

10. A sampling device suitable for use with petrochemical products according to any one of claims 1 to 9, characterised in that, The controller is provided with a display screen and buttons, the container is provided with three layers, the middle layer is a heat preservation layer, the heat preservation layer adopts a vacuum structure, and the outer layer or / and the inner layer is sprayed with a Teflon coating.

11. A sampling device suitable for use with petroleum chemical products according to claim 8 or 9, characterized in that, The container is a barrel, and the lower support is provided with a fixing rod.

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