Vertical pipe, loading arm and liquid recycling and sampling method for loading arm

Abstract

The invention provides a vertical pipe, a loading crane pipe and a liquid recycling and sampling method for the loading crane pipe, and belongs to the field of loading crane pipes, the vertical pipe comprises a vertical pipe body, the vertical pipe body is of a tubular structure with an open upper end and a closed lower end, and a liquid outlet is formed in the position, close to the lower end of the vertical pipe body, of the side wall of the vertical pipe body; an anti-overflow opening and a liquid discharging opening penetrate through the lower end face of the vertical pipe body, an anti-overflow pipe is fixedly installed on the inner side of the anti-overflow opening, and the upper end of the anti-overflow pipe is lower than the liquid discharging opening. A liquid discharging pipe is fixedly installed on the outer side of the liquid discharging opening, and a liquid discharging control valve is installed on the liquid discharging pipe. The loading arm has the beneficial effects that the problem that a traditional loading arm cannot conduct residual liquid recycling and automatic sampling can be solved, the loading efficiency is greatly improved, potential safety hazards are solved, and the labor cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field, and particularly relates to a vertical pipe, a loading arm, and a liquid recovery sampling method for the loading arm. Background Art

[0002] Industrial Internet is a new type of infrastructure, application mode, and industrial ecosystem that deeply integrates the new generation of information and communication technologies with the industrial economy. It can build a new manufacturing and service system covering the entire industrial chain and value chain through the comprehensive connection of people, machines, things, systems, etc., providing a way to realize the digitalization, networking, and intelligent development of industry and even the entire industry. Especially in the chemical industry, due to the industry attributes of corrosion, toxicity, flammability, and explosiveness in the chemical industry itself, promoting related work such as replacing humans with mechanization, reducing humans with automation, and replacing humans with intelligence through the transformation of the Industrial Internet in dangerous sections can help chemical plants achieve less personnel and unmanned operation in the operation process, thereby reducing the occurrence of major safety accidents caused by human misoperation.

[0003] For example, in the tank truck loading and filling operations of common liquids such as liquefied gas, liquid caustic soda, liquid ammonia, and liquid chlorine in the chemical industry, it mainly relies on tank trucks for transportation, and the traditional filling mode mainly depends on personnel to manually operate the loading arm to complete. During the entire filling process, the filling personnel need to first move to the top of each tank truck, align the vertical pipe of the loading arm with the tank opening, and then insert the loading arm for filling; at the same time, the filling personnel need to visually observe the liquid level in the tank during the entire filling process to control the filling process. Therefore, during the filling operation process, the safety risk of the entire operation environment is relatively high, and it is easy to cause harm to the filling personnel due to leakage, splashing, volatilization, etc. of the filled liquid; at the same time, the filling personnel on the platform are also prone to falling and even dropping, which may lead to casualties.

[0004] Based on this, the chemical industry has started to transform through artificial intelligence and automation control technologies to achieve one-key positioning and fully automatic filling of the loading arm, promoting less personnel, unmanned, and intelligent operation processes in chemical plants, and reducing the occurrence of major safety accidents caused by human misoperation. However, although the existing loading arms have used visual positioning technology to solve the problems of automatic movement and automatic insertion into the tank opening of the loading arm, when the loading is completed, there will be residual liquid on the loading arm. During the reset process of the loading arm that has not been purged clean, the residual liquid is still prone to splashing, thus dripping onto the tank truck and the loading platform, causing corrosion; therefore, there are still relatively large safety hazards.

[0005] Meanwhile, according to the loading process, after the loading arm is reset, manual sampling of the liquid in the tank car is still required. Therefore, in the existing filling operation, the operator still needs to climb onto the tank car and manually extend the sampling bottle into the tank car through a rope to scoop up a small amount of liquid from the tank car for retention. Moreover, the entire sampling process is also rather cumbersome and poses potential safety hazards. Summary of the Invention

[0006] The object of the present invention is to propose and design a vertical pipe, a loading arm, and a liquid recovery and sampling method for the loading arm to solve the problems that the loading arm cannot recover residual liquid and automatically sample when the tank car is used for filling operation in the chemical industry field, greatly improve the loading efficiency, solve the safety hazards, and reduce the labor cost.

[0007] To achieve the above object, on the one hand, the present invention provides a vertical pipe, which includes a vertical pipe body. The vertical pipe body is a tubular structure with an open upper end and a closed lower end. An outlet is provided on the side wall of the vertical pipe body near the lower end of the vertical pipe body. The lower end face of the vertical pipe body is penetrated with an overflow prevention port and a liquid discharge port. An overflow prevention pipe is fixedly installed inside the overflow prevention port, and the upper end of the overflow prevention pipe is lower than the outlet. A liquid discharge pipe is fixedly installed outside the liquid discharge port, and a liquid discharge control valve is installed on the liquid discharge pipe. Based on this, the present invention reforms the vertical pipe part of the loading arm, that is, by setting the outlet on the side wall of the end of the vertical pipe and adding an overflow prevention port, an overflow prevention pipe, a liquid discharge port, and a liquid discharge port at the end of the vertical pipe. The present invention can form a residual liquid pool for storing liquid at the bottom of the vertical pipe. After the loading is completed, most of the liquid in the residual liquid pool can automatically flow back into the tank car through the overflow prevention port and the liquid discharge port, reducing the liquid flow rate remaining at the bottom of the vertical pipe to prevent the problem of residual liquid sloshing out from the outlet or the overflow prevention port during the lifting and resetting processes of the vertical pipe. And by automatically storing a small amount of liquid in the residual liquid pool at the bottom of the vertical pipe, the loading arm can, after being reset, only by controlling the opening and closing of the corresponding liquid discharge control valve, put the residual liquid into the sampling bottle to achieve automatic sampling operation. Thus, the problems that the traditional loading arm cannot recover residual liquid and automatically sample are solved, the loading efficiency is greatly improved, the safety hazards are solved, and the labor cost is reduced.

[0008] Furthermore, at least two outlets are provided at intervals along the circumferential direction of the side wall of the vertical pipe body to ensure that the liquid outlet speed of the vertical pipe body can meet the requirements.

[0009] Furthermore, the upper end of the overflow prevention pipe is 2 - 10 centimeters lower than the bottom end of the outlet, and the specific value can be determined according to the amount of liquid sampling, as long as it is ensured that the liquid remaining in the residual liquid pool formed between the upper end of the overflow prevention pipe and the lower end face of the vertical pipe body can meet the requirements of the sampling amount.

[0010] Further, the upper end of the overflow prevention pipe is 5 cm lower than the bottom end of the liquid outlet, and the overflow prevention pipe preferably adopts a cylindrical pipe with a diameter of 1-2 cm.

[0011] Further, the lower end of the liquid discharge pipe is 5-15 cm lower than the lower end face of the vertical pipe body, and the specific value can be determined according to the size of the sampling bottle, as long as it is ensured that the lower end of the liquid discharge pipe will not collide with the bottom of the sampling bottle and that the lower end of the liquid discharge pipe can extend into the sampling bottle.

[0012] Further, the lower end of the liquid discharge pipe is 10 cm lower than the lower end face of the vertical pipe body, and the liquid discharge pipe preferably adopts a cylindrical pipe with a diameter of 2 cm.

[0013] Further, the liquid discharge control valve is an electromagnetic valve and can be communicatively connected to the control system of the loading arm, that is, the automatic filling control system of the loading arm, through a communication module to cooperate in completing the corresponding automated operations.

[0014] On the other hand, the present invention also provides a loading arm, which includes a loading arm body, and the output end of the loading arm body is provided with the above-mentioned vertical pipe, and the automatic residual liquid recovery and automatic sampling operations can be completed through the above-mentioned vertical pipe in cooperation with the control system of the loading arm body.

[0015] In addition, the present invention also provides a method for liquid recovery and sampling for a loading arm, which applies the above-mentioned loading arm and includes a residual liquid recovery step and an automatic sampling step; Residual liquid recovery step: After the loading arm completes the filling operation, the automatic filling control system of the loading arm first lifts the vertical pipe above the liquid level of the filled liquid. At this time, the liquid remaining at the lower end of the vertical pipe body will flow back into the filled container through the overflow prevention pipe and the overflow prevention port until the liquid level of the liquid remaining at the lower end of the vertical pipe body is flush with the upper end of the overflow prevention pipe; finally, the automatic filling control system of the loading arm controls the vertical pipe to be removed from the filled container. Automatic sampling step: First, place a sampling bottle at the designated reset position of the loading arm. Then, after the vertical pipe of the loading arm is removed from the filled container, the automatic filling control system of the loading arm controls the vertical pipe to move to the designated reset position and inserts the liquid discharge pipe of the vertical pipe into the sampling bottle; then the automatic filling control system of the loading arm controls the liquid discharge control valve to open, and the liquid remaining at the lower end of the vertical pipe body flows into the sampling bottle through the liquid discharge pipe to complete the sampling operation.

[0016] Further, in the residual liquid recovery step, when the liquid level of the liquid remaining at the lower end of the vertical pipe body is flush with the upper end of the anti-overflow pipe, first control the liquid discharge control valve to open, and let a part of the liquid remaining at the lower end of the vertical pipe body flow back into the container to be filled through the liquid discharge pipe. Then control the liquid discharge control valve to close, and finally control the vertical pipe body to be removed from the container to be filled, thereby further ensuring that the liquid remaining at the lower end of the vertical pipe body will not slosh out from the anti-overflow port during the lifting process and reset process of the vertical pipe body.

[0017] From the above technical solutions, it can be seen that the present invention has the following advantages: By transforming the vertical pipe part of the loading crane pipe, that is, by setting the liquid outlet on the side wall of the end of the vertical pipe, and by adding an anti-overflow port, an anti-overflow pipe, a liquid discharge port, and a liquid discharge port at the end of the vertical pipe, the present invention can not only prevent the problem of residual liquid sloshing out from the liquid outlet or the anti-overflow port during the lifting process and reset process of the vertical pipe; but also can realize automatic sampling operation, thereby improving the filling efficiency and the safety during the filling process, and solving the long-term unsolved problems in the liquid filling industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention.

[0020] In the figure: 1. Vertical pipe body; 2. Liquid outlet; 3. Anti-overflow pipe; 4. Residual liquid pool; 5. Liquid discharge pipe; 6. Liquid discharge control valve; 7. Liquid discharge port; 8. Anti-overflow port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the purpose, features, and advantages of the present invention more obvious and understandable, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments of the present invention. Obviously, the embodiments described below are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this patent.

[0022] Embodiment 1 As Figure 1As shown in the figure, the first embodiment provides a vertical pipe, which includes a vertical pipe body 1. The vertical pipe body 1 is a tubular structure with an open upper end and a closed lower end. Moreover, a liquid outlet 2 is provided at a position on the side wall of the vertical pipe body 1 close to the lower end of the vertical pipe body, and the liquid conveyed is discharged into a corresponding liquid filling appliance such as a tank truck through the liquid outlet 2. Moreover, preferably, in the first embodiment, a plurality of liquid outlets 2 can be circumferentially spaced and provided at a position on the side wall of the vertical pipe body 1 close to the lower end of the vertical pipe body 1 to ensure that the conveyed liquid can be smoothly and quickly discharged into a corresponding liquid filling appliance such as a tank truck.

[0023] At the same time, in the first embodiment, an overflow prevention port 8 and a liquid discharge port 7 penetrate through the lower end surface of the vertical pipe body 1. Among them, an overflow prevention pipe 3 is fixedly installed inside the overflow prevention port 8, that is, the overflow prevention pipe 3 is fixedly installed at the upper end of the overflow prevention port 8. The upper end of the overflow prevention pipe 3 is lower than the liquid outlet 2, and the distance between the upper end of the overflow prevention pipe 3 and the bottom end of the liquid outlet 2 can be determined according to the amount of liquid sampling, as long as it is ensured that the liquid remaining in the residual liquid pool 4 formed between the upper end of the overflow prevention pipe 3 and the lower end surface of the vertical pipe body 1 can meet the requirements of the sampling amount. For example, the upper end of the overflow prevention pipe 3 can be 5 centimeters lower than the bottom end of the liquid outlet 2, and the overflow prevention pipe 3 is made of a cylindrical pipe with a diameter of 1-2 centimeters.

[0024] A liquid discharge pipe 5 is fixedly installed outside the liquid discharge port 7, that is, the liquid discharge pipe 5 is fixedly installed at the lower end of the liquid discharge port 7. Moreover, a liquid discharge control valve 6 is installed in the middle of the liquid discharge pipe 5. The liquid discharge control valve 6 adopts a solenoid valve structure and is communicatively connected to the automatic filling control system of the corresponding loading arm through a communication module. The specific height difference between the lower end of the liquid discharge pipe 5 and the lower end surface of the vertical pipe body 1 can be determined according to the size of the sampling bottle, as long as it is ensured that the lower end of the liquid discharge pipe 5 will not collide with the bottom of the sampling bottle and the lower end of the liquid discharge pipe 5 can extend into the sampling bottle. For example, the lower end of the liquid discharge pipe 5 can be 10 centimeters lower than the lower end surface of the vertical pipe body 1, and the liquid discharge pipe 5 is made of a cylindrical pipe with a diameter of 2 centimeters.

[0025] At this time, when the vertical pipe of the loading arm adopts the vertical pipe structure provided in the first embodiment, after the loading arm completes the filling operation, the vertical pipe can be first lifted above the liquid level of the filled liquid. At this time, the liquid remaining at the lower end of the vertical pipe body 1 will flow back into the filled container through the anti-overflow pipe 3 and the anti-overflow port 8, and under the height constraint of the anti-overflow pipe 3, it is ensured that the liquid level of the liquid finally remaining at the lower end of the vertical pipe body 1 is flush with the upper end of the anti-overflow pipe 3, that is, it is ensured that the volume of the liquid remaining at the lower end of the vertical pipe body 1 is consistent with the volume of the residual liquid tank 4, thereby ensuring that the liquid remaining in the residual liquid tank 4 still meets the sampling requirements after the subsequent liquid discharge treatment; then control the liquid discharge control valve 6 to open for a certain period of time, and discharge part of the liquid remaining at the lower end of the vertical pipe body 1 back into the filled container through the liquid discharge pipe 5, so as to ensure that the liquid remaining at the lower end of the vertical pipe body 1 will not slosh out from the anti-overflow port 8 during the lifting process and the reset process of the vertical pipe body 1. Finally, control the liquid discharge control valve 6 to close, and control the vertical pipe body 1 to be removed from the filled container, thus completing the residual liquid recovery operation. Moreover, during the above process, for the opening time of the liquid discharge control valve 6, it can be calculated according to the volume of the residual liquid tank 4, the flow rate of the liquid discharge control valve 6, and the sampling volume, as long as it is ensured that the liquid remaining in the residual liquid tank 4 still meets the sampling requirements after the subsequent liquid discharge treatment. For the liquid discharge operation of the liquid discharge port 7, after closing the liquid discharge control valve 6, the vertical pipe can stay in the filled container for a period of time, so that the liquid remaining in the liquid discharge pipe 5 drips into the filled container, rather than the outer wall of the filled container.

[0026] When a sampling operation is required, a sampling bottle can be first placed at the designated reset position of the loading arm, then the vertical pipe is removed from the filled container and moved to the designated reset position, and the liquid discharge pipe 5 of the vertical pipe is inserted into the sampling bottle; then control the liquid discharge control valve 6 to open, and discharge the liquid remaining at the lower end of the vertical pipe body 1 through the liquid discharge pipe 5 into the sampling bottle to complete the sampling operation.

[0027] Moreover, based on the above operation process, the first embodiment can transform the vertical pipe part of the loading arm, that is, by setting the liquid outlet 2 on the side wall of the end of the vertical pipe, and by adding an anti-overflow port 8, an anti-overflow pipe 3, a liquid discharge port 7, and a liquid discharge port 7 at the end of the vertical pipe, solve the problems that the traditional loading arm cannot perform residual liquid recovery and automatic sampling, greatly improve the loading efficiency, solve safety hazards, and reduce labor costs.

[0028] Embodiment Two Embodiment 2 provides a loading arm, which includes a loading arm body, and a vertical pipe is installed at the output end of the loading arm body. The vertical pipe includes a vertical pipe body 1, which is a tubular structure with an open upper end and a closed lower end, and the upper end of the vertical pipe body 1 is detachably connected to the output end of the loading arm body. A liquid outlet 2 is provided at a position on the side wall of the vertical pipe body 1 close to the lower end of the vertical pipe body 1, and the liquid to be transported is discharged into a corresponding liquid filling appliance such as a tank truck through the liquid outlet 2. And preferably, in Embodiment 2, a plurality of liquid outlets 2 can be circumferentially spaced apart on the side wall of the vertical pipe body 1 to ensure that the liquid to be transported can be smoothly and quickly discharged into a corresponding liquid filling appliance such as a tank truck.

[0029] At the same time, in Embodiment 2, an overflow prevention port 8 and a liquid discharge port 7 penetrate through the lower end surface of the vertical pipe body 1. Among them, an overflow prevention pipe 3 is fixedly installed inside the overflow prevention port 8, that is, an overflow prevention pipe 3 is fixedly installed at the upper end of the overflow prevention port 8. The upper end of the overflow prevention pipe 3 is lower than the liquid outlet 2, and the distance between the upper end of the overflow prevention pipe 3 and the bottom end of the liquid outlet 2 can be determined according to the amount of liquid sampling, as long as the liquid remaining in the residual liquid pool 4 formed between the upper end of the overflow prevention pipe 3 and the lower end surface of the vertical pipe body 1 can meet the requirements of the sampling amount. For example, the upper end of the overflow prevention pipe 3 can be 5 cm lower than the bottom end of the liquid outlet 2, and the overflow prevention pipe 3 is made of a cylindrical pipe with a diameter of 1-2 cm.

[0030] A liquid discharge pipe 5 is fixedly installed outside the liquid discharge port 7, that is, a liquid discharge pipe 5 is fixedly installed at the lower end of the liquid discharge port 7. And a liquid discharge control valve 6 is installed in the middle of the liquid discharge pipe 5. The liquid discharge control valve 6 adopts a solenoid valve structure and is communicatively connected to the automatic filling control system of the loading arm body through a communication module. The specific height difference between the lower end of the liquid discharge pipe 5 and the lower end surface of the vertical pipe body 1 can be determined according to the size of the sampling bottle, as long as it is ensured that the lower end of the liquid discharge pipe 5 will not collide with the bottom of the sampling bottle and the lower end of the liquid discharge pipe 5 can extend into the sampling bottle. For example, the lower end of the liquid discharge pipe 5 can be 10 cm lower than the lower end surface of the vertical pipe body 1, and the liquid discharge pipe 5 is made of a cylindrical pipe with a diameter of 2 cm.

[0031] Based on this, Embodiment 2 can solve the problems of the traditional loading arm that cannot recycle residual liquid and automatically sample by transforming the vertical pipe part of the loading arm, that is, by arranging the liquid outlet 2 on the side wall of the end of the vertical pipe and adding an overflow prevention port 8, an overflow prevention pipe 3, a liquid discharge port 7, and a liquid discharge port 7 at the end of the vertical pipe, greatly improving the loading efficiency, solving potential safety hazards, and reducing labor costs.

[0032] Embodiment 3 Embodiment 3 of the present invention provides a liquid recovery and sampling method for a loading arm, which uses the loading arm described in Embodiment 2 and includes a residual liquid recovery step and an automatic sampling step.

[0033] Among them, the residual liquid recovery step includes the following: after the loading arm completes the filling operation, the automatic filling control system of the loading arm first lifts the vertical pipe above the liquid level of the filled liquid. At this time, the liquid remaining at the lower end of the vertical pipe body 1 will flow back into the filled container through the overflow prevention pipe 3 and the overflow prevention port 8 until the liquid level of the liquid remaining at the lower end of the vertical pipe body 1 is flush with the upper end of the overflow prevention pipe 3; finally, the automatic filling control system of the loading arm controls the vertical pipe to move out of the filled container.

[0034] Moreover, preferably, in Embodiment 3, after the liquid level of the liquid remaining at the lower end of the vertical pipe body 1 is flush with the upper end of the overflow prevention pipe 3, the liquid discharge control valve 6 can be controlled to open first, and a part of the liquid remaining at the lower end of the vertical pipe body 1 is allowed to flow back into the filled container through the liquid discharge pipe 5, then the liquid discharge control valve 6 is controlled to close, and finally the vertical pipe body 1 is controlled to move out of the filled container, so as to further ensure that the liquid remaining at the lower end of the vertical pipe body 1 will not slosh out from the overflow prevention port 8 during the lifting process and reset process of the vertical pipe body 1. And during this process, for the opening time of the liquid discharge control valve 6, it can be calculated according to the volume of the residual liquid tank 4, the flow rate of the liquid discharge control valve 6, and the sampling volume, as long as it is ensured that the liquid remaining in the residual liquid tank 4 still meets the sampling requirements after the subsequent liquid discharge treatment. At the same time, after the liquid discharge control valve 6 is closed, the vertical pipe can be allowed to stay in the filled container for a period of time before being removed, so as to ensure that the liquid remaining in the liquid discharge pipe 5 drips into the filled container rather than the outer wall of the filled container.

[0035] The automatic sampling step includes the following: first, a sampling bottle is placed at the designated reset position of the loading arm, and then after the vertical pipe of the loading arm is moved out of the filled container, the automatic filling control system of the loading arm controls the vertical pipe to move to the designated reset position and inserts the liquid discharge pipe 5 of the vertical pipe into the sampling bottle; then the automatic filling control system of the loading arm controls the liquid discharge control valve 6 to open, and the liquid remaining at the lower end of the vertical pipe body 1 flows into the sampling bottle through the liquid discharge pipe 5 to complete the sampling operation.

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vertical pipe, comprising a vertical pipe body (1), characterized in that, The vertical pipe body (1) is a tubular structure with an open upper end and a closed lower end. An outlet (2) is provided on the side wall of the vertical pipe body (1) near the lower end of the vertical pipe body (1). The lower end face of the vertical pipe body (1) is penetrated with an anti-overflow port (8) and a liquid discharge port (7). An anti-overflow pipe (3) is fixedly installed inside the anti-overflow port (8), and the upper end of the anti-overflow pipe (3) is lower than the outlet (2); a liquid discharge pipe (5) is fixedly installed outside the liquid discharge port (7), and a liquid discharge control valve (6) is installed on the liquid discharge pipe (5).

2. The vertical pipe according to claim 1, wherein, At least two outlets (2) are provided on the side wall of the vertical pipe body (1) at circumferential intervals.

3. The vertical pipe according to claim 1, characterized in that, The upper end of the anti-overflow pipe (3) is 2 - 10 cm lower than the bottom end of the outlet (2).

4. The vertical pipe according to claim 3, characterized in that, The upper end of the anti-overflow pipe (3) is 5 cm lower than the bottom end of the outlet (2).

5. The vertical pipe according to claim 1, wherein The lower end of the liquid discharge pipe (5) is 5 - 15 cm lower than the lower end face of the vertical pipe body (1).

6. The vertical pipe according to claim 5, wherein The lower end of the liquid discharge pipe (5) is 10 cm lower than the lower end face of the vertical pipe body (1).

7. The vertical pipe according to claim 1, characterized in that, The liquid discharge control valve (6) is an electromagnetic valve.

8. A loading arm, comprising a loading arm body, characterized in that, The output end of the loading arm pipe body is installed with the vertical pipe according to any one of claims 1 - 7.

9. A liquid recovery sampling method for a loading arm, characterized in that, Applying the loading arm pipe according to claim 8, including a residual liquid recovery step and an automatic sampling step; Residual liquid recovery step: When the loading arm pipe completes the filling operation, the automatic filling control system of the loading arm pipe first lifts the vertical pipe above the liquid level of the filled liquid. At this time, the liquid remaining at the lower end of the vertical pipe body (1) will flow back into the filled container through the anti-overflow pipe (3) and the anti-overflow port (8) until the liquid level of the liquid remaining at the lower end of the vertical pipe body (1) is flush with the upper end of the anti-overflow pipe (3); finally, the automatic filling control system of the loading arm pipe controls the vertical pipe to be removed from the filled container; Automatic sampling step: First, place a sampling bottle at the designated reset position of the loading arm pipe. Then, after the vertical pipe of the loading arm pipe is removed from the filled container, the automatic filling control system of the loading arm pipe controls the vertical pipe to move to the designated reset position and inserts the liquid discharge pipe (5) of the vertical pipe into the sampling bottle; then the automatic filling control system of the loading arm pipe controls the liquid discharge control valve (6) to open, and the liquid remaining at the lower end of the vertical pipe body (1) flows into the sampling bottle through the liquid discharge pipe (5) to complete the sampling operation.

10. The liquid recovery sampling method for a loading arm according to claim 9, wherein In the residual liquid recovery step, after the liquid level of the liquid remaining at the lower end of the vertical pipe body (1) is flush with the upper end of the anti-overflow pipe (3), first control the liquid discharge control valve (6) to open, and let a part of the liquid remaining at the lower end of the vertical pipe body (1) flow back into the filled container through the liquid discharge pipe (5), then control the liquid discharge control valve (6) to close, and finally control the vertical pipe body (1) to be removed from the filled container.

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