Automatic adsorption device for low-height refueling pipeline

By installing a low-height gas pipeline automatic adsorption device on the pipeline refueling truck, the hook assembly is automatically adsorbed to the U-shaped pipe by using electromagnetic adsorption technology, the problem of difficulty in fitting and attaching the ground well hose hook is solved, and automatic and accurate hooking is achieved. Reduces the intensity of labor and the risk of waist injury.

CN222142205UActive Publication Date: 2024-12-10SOUTH CHINA BLUESKY AVIATION OIL & GAS CO LTD
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Patent Information

Application Number
CN202420234025.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-30
Publication Date
2024-12-10
Estimated Expiration
2034-01-30

AI Technical Summary

Technical Problem

In the prior art, after the pipeline refueling vehicle is refueling, it is difficult to accurately hook the U-shaped pipe on the ground well hose, resulting in manual support to achieve hooking, which increases labor intensity and risk of waist injury.

Method used

An automatic adsorption device for low-height refueling pipelines is designed. The magnetically absorbable hook assembly and electromagnetic adsorption device on the U-shaped tube are used to automatically adsorb the hook assembly on the U-shaped tube to achieve accurate fit between the ground well hose and the U-shaped tube. Connect to reduce manual intervention.

Benefits of technology

Through the automatic adsorption device, the accurate connection between the ground well hose and the U-shaped tube is achieved, which reduces labor intensity, avoids the risk of waist damage, and improves the attachment efficiency and safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of pipeline refueling vehicle accessories, in particular to a low-height refueling pipeline automatic adsorption device which comprises a U-shaped pipe, a ground well rubber pipe and a hook assembly which is connected to the ground well rubber pipe and can be connected to the U-shaped pipe in a hanging mode, and the U-shaped pipe is provided with an electromagnetic adsorption device capable of magnetically adsorbing the hook assembly. The hook assembly is made to be close to the U-shaped pipe through magnetic attraction force, so that the ground well rubber pipe and the U-shaped pipe are automatically attached, accurate hooking of the ground well rubber pipe and the U-shaped pipe is achieved, manual external force intervention is not needed, labor is reduced, and the technical problem that in the prior art, a hook of the ground well rubber pipe is difficult to attach and hook the U-shaped pipe is effectively solved.
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Description

Technical Field

[0001] The utility model relates to the technical field of pipeline refueling vehicle accessories, and more specifically, to an automatic adsorption device for a low-height refueling pipeline. Background Art

[0002] The pipeline refueling vehicle is a special vehicle commonly used on the airport ground during aircraft refueling services. It is mainly used for refueling in the ground well network. Before refueling, the trailer beam is moved down to lower the ground well refueling joint and the refueling hose. The refueler drags the refueling joint to the ground well bolt for docking. After refueling, the ground well joint and the refueling hose are dragged back to the pipeline vehicle, the trailer beam is raised, and the refueling hose is driven up together to complete the return of the refueling hose.

[0003] For example, the prior art discloses a ground well hose hook device for a pipeline refueling vehicle, comprising a hanger, a U-bolt disposed on the hanger for connecting with a trailer beam, and a rotatable hook for hooking the ground well hose; the hook is disposed on the hanger; the hanger is also provided with a driving structure for driving the hook to rotate; the driving structure is connected to the hook. During the refueling operation, the manual reversing valve installed on the vehicle body is manually operated to switch the oil circuit to complete the retraction and extension of the ground well hose. This solution allows the ground well hose to be constantly connected to the trailer beam through the U-bolt, and to rise or fall together with the trailer beam, without the need to frequently remove the hook device from the trailer beam.

[0004] However, in the prior art, after refueling is completed, the ground well hose is retracted, and the ground well joint is placed in the ground well joint tray. However, the ground well hose bulges outward due to redundant length, making it impossible for the hook of the ground well hose to accurately hang on the U-shaped tube. It is necessary to hold the ground well hose with hands during the lifting process to make it lean against the U-shaped tube, but this increases the labor intensity of the personnel. Bending over and holding the hose with hands for a long time will increase the probability of waist injury to the personnel. There is a technical problem that the hook of the ground well hose is difficult to fit and hang on the U-shaped tube. Utility Model Content

[0005] The utility model aims to overcome the disadvantage that the hook of the underground well hose in the prior art is difficult to fit and hang on the U-shaped pipe, and provides a low-height refueling pipeline automatic adsorption device.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] An automatic adsorption device for a low-height refueling pipeline comprises a U-shaped tube, a ground well hose, and a hook assembly connected to the ground well hose and hookable to the U-shaped tube. The U-shaped tube is provided with an electromagnetic adsorption device capable of magnetically attracting the hook assembly.

[0008] The utility model discloses an automatic adsorption device for a low-height refueling pipeline, in which a hook component is hung on the U-shaped tube, thereby fixing the ground well hose and the U-shaped tube. However, since the ground well hose protrudes outward due to redundant length, the ground well hose does not fit with the U-shaped tube. Since the U-shaped tube is provided with an electromagnetic adsorption device that can magnetically attract the hook component, the magnetic attraction force is used to make the hook component close to the U-shaped tube, so that the ground well hose and the U-shaped tube are automatically fitted together, thereby achieving accurate hanging of the ground well hose and the U-shaped tube, without the need for manual external force intervention, reducing labor, and effectively solving the technical problem in the prior art that the hook of the ground well hose is difficult to fit and hang on the U-shaped tube.

[0009] Furthermore, the hook assembly includes a hook part, a magnetic part connected to the bottom of the hook part, and a sleeve provided on the magnetic part, the electromagnetic adsorption device can magnetically attract the magnetic part, and the sleeve is sleeved on the outer wall of the underground well hose. The hook part is used to be hooked with the U-shaped pipe, the magnetic part connected to the bottom of the hook part can be magnetically attracted by the electromagnetic adsorption device, and the sleeve provided on the magnetic part is sleeved on the outer wall of the underground well hose to achieve a stable connection between the underground well hose and the hook assembly.

[0010] Furthermore, the hook assembly also includes a support base connected to the bottom of the magnetic attraction part, the support base is arranged below the sleeve, and a gap is arranged between the sleeve and the support base. The support base is arranged below the sleeve to support the hook assembly, and since there is a gap between the sleeve and the support base, the underground well hose can be prevented from contacting the ground.

[0011] Furthermore, the U-shaped tube is provided with a micro cylinder, and the electromagnetic adsorption device is provided at the end of the push rod of the micro cylinder, and the extension direction of the push rod is perpendicular to the axial direction of the ground well hose. After the push rod of the micro cylinder is extended, the electromagnetic adsorption device contacts the magnetic attraction part. When the magnetic hook assembly is needed, the push rod is extended by the micro cylinder to make the electromagnetic adsorption device at the end of the push rod contact with the magnetic attraction part. When the hook assembly needs to be removed, the push rod of the micro cylinder is retracted to separate the electromagnetic adsorption device from the magnetic attraction part, so as to facilitate taking and placing.

[0012] Furthermore, a fixing plate is provided between the micro cylinder and the U-shaped tube, the micro cylinder is fixedly connected to the lower end of the fixing plate, the upper end of the fixing plate is fixedly fitted with the U-shaped tube, the fixing plate is provided on the side of the U-shaped tube away from the ground well hose, and the hook part can be hooked at the position where the fixing plate and the U-shaped tube are fitted. The micro cylinder and the U-shaped tube are fixedly fixed by fitting the upper end of the fixing plate with the U-shaped tube and fixing the micro cylinder with the lower end of the fixing plate; since the hook part can be hooked at the position where the fixing plate and the U-shaped tube are fitted, the gap of the hook part is reduced and the hooking strength is improved.

[0013] Furthermore, a ground well connector is provided at the end of the ground well hose, and a ground well tray is provided at the end of the U-shaped tube. The ground well connector can be placed on the ground well tray, and when the ground well connector is placed on the ground well tray, the electromagnetic adsorption device corresponds to the position of the magnetic adsorption part. When the ground well connector is placed on the ground well tray, the electromagnetic adsorption device corresponds to the position of the magnetic adsorption part, so that the two ends of the ground well hose can maintain a balance in a fixed position.

[0014] Furthermore, a ground well support plate is provided between the U-shaped tube and the ground well tray, one end of the ground well support plate is hung on the U-shaped tube, and the other end is connected and fixed to the outer wall of the ground well tray. By hanging one end of the ground well support plate on the U-shaped tube and connecting and fixing the other end to the outer wall of the ground well tray, the ground well tray and the U-shaped tube are fixed.

[0015] Furthermore, the ground well support plate is provided with an induction switch. When the ground well connector is placed on the ground well tray, the outer wall of the ground well connector can trigger the induction switch, and the induction switch is connected to the micro cylinder signal. When the ground well connector is placed on the ground well tray and the induction switch is triggered, since the induction switch is connected to the micro cylinder signal, the micro cylinder extends a push rod after receiving the signal, so that the electromagnetic adsorption device attracts the magnetic attraction part; when the ground well connector is separated from the ground well tray, the induction switch controls the micro cylinder to retract the push rod, so that the electromagnetic adsorption device is separated from the magnetic attraction part, and intelligent picking and placing is realized.

[0016] Furthermore, the electromagnetic adsorption device is provided with a delay controller for controlling the start and stop, and the delay controller is connected to the induction switch signal. When the well connector is placed on the well tray and triggers the induction switch, since the delay controller is connected to the induction switch signal, the delay controller powers on and starts the electromagnetic adsorption device after receiving the signal; when the well connector is detached from the well tray, the delay controller controls the electromagnetic adsorption device to power off and shut down, achieving the effect of an electromagnetic adsorption device that automatically starts and stops, avoiding continuous power on of the electromagnetic adsorption device and reducing energy consumption.

[0017] Furthermore, the electromagnetic adsorption device has a cylindrical shape, and the outer diameter of the cylindrical electromagnetic adsorption device is smaller than the width of the magnetic adsorption portion. The shape of the electromagnetic adsorption device is set to be cylindrical. Since the outer diameter of the electromagnetic adsorption device is smaller than the width of the magnetic adsorption portion, it is ensured that the electromagnetic adsorption device is fully adsorbed on the magnetic adsorption portion as much as possible, and the magnetic adsorption energy efficiency is fully exerted.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model discloses an automatic adsorption device for a low-height refueling pipeline. The U-shaped tube is provided with an electromagnetic adsorption device which can magnetically attract a hook component. The magnetic attraction force is used to make the hook component close to the U-shaped tube, so that the ground well hose and the U-shaped tube are automatically fitted together, thereby achieving accurate fitting of the ground well hose and the U-shaped tube without the need for manual external force intervention, reducing labor input, and effectively solving the technical problem in the prior art that the hook of the ground well hose is difficult to fit and hook onto the U-shaped tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective and structural schematic diagram of an automatic adsorption device for a low-height refueling pipeline;

[0021] Figure 2 A schematic diagram of the structure of a low-height refueling pipeline automatic adsorption device from a second perspective;

[0022] Figure 3 This is a schematic diagram of the structure from three perspectives of an automatic adsorption device for a low-altitude refueling pipeline.

[0023] In the attached drawings: 1. U-shaped tube; 2. ground well hose; 3. hook assembly; 31. hook part; 32. magnetic part; 33. casing; 34. supporting base; 4. electromagnetic adsorption device; 5. micro cylinder; 51. fixing plate; 6. ground well joint; 7. ground well tray; 71. ground well support plate; 72. induction switch. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] like Figure 1 to Figure 2The figure shows a first embodiment of an automatic adsorption device for a low-height refueling pipeline of the utility model.

[0028] An automatic adsorption device for a low-height refueling pipeline includes a U-shaped tube 1, a ground well hose 2, and a hook assembly 3 connected to the ground well hose 2 and can be hung on the U-shaped tube 1. The U-shaped tube 1 is provided with an electromagnetic adsorption device 4 that can magnetically attract the hook assembly 3. The hook assembly 3 includes a hook portion 31, a magnetic attraction portion 32 connected to the bottom of the hook portion 31, and a sleeve 33 provided on the magnetic attraction portion 32. The electromagnetic adsorption device 4 can magnetically attract the magnetic attraction portion 32, and the sleeve 33 is sleeved on the outer wall of the ground well hose 2. The hook assembly 3 also includes a support base 34 connected to the bottom of the magnetic attraction portion 32, the support base 34 is provided below the sleeve 33, and a gap is provided between the sleeve 33 and the support base 34. The electromagnetic adsorption device 4 has a cylindrical shape, and the outer diameter of the cylindrical electromagnetic adsorption device 4 is smaller than the width of the magnetic attraction portion 32.

[0029] In this embodiment, if Figure 1 As shown, the hook component 3 is hung on the U-shaped tube 1, thereby fixing the ground well hose 2 and the U-shaped tube 1, but since the ground well hose 2 protrudes outward due to redundant length, the ground well hose 2 does not fit with the U-shaped tube 1. Since the U-shaped tube 1 is provided with an electromagnetic adsorption device 4 that can magnetically attract the hook component 3, the magnetic attraction force is used to make the hook component 3 close to the U-shaped tube 1, so that the ground well hose 2 and the U-shaped tube 1 are automatically fitted, thereby achieving accurate hanging of the ground well hose 2 and the U-shaped tube 1, without the need for manual external force intervention, reducing labor, and effectively solving the technical problem in the prior art that the hook of the ground well hose 2 is difficult to fit and hang on the U-shaped tube 1.

[0030] In this embodiment, if Figure 1 As shown, the hook portion 31 is used to hang with the U-shaped tube 1, and the magnetic suction portion 32 connected below the hook portion 31 can be magnetically attracted by the electromagnetic adsorption device 4, and the sleeve 33 provided on the magnetic suction portion 32 is sleeved on the outer wall of the ground well hose 2 to achieve a stable connection between the ground well hose 2 and the hook assembly 3.

[0031] In this embodiment, if Figure 2 As shown, the support base 34 is arranged below the casing 33 to support the hook assembly 3. Since there is a gap between the casing 33 and the support base 34, the underground well hose 2 can be prevented from contacting the ground.

[0032] In this embodiment, if Figure 1 As shown, the shape of the electromagnetic adsorption device 4 is set to be a cylinder. Since the outer diameter of the electromagnetic adsorption device 4 is smaller than the width of the magnetic adsorption part 32, it is ensured that the electromagnetic adsorption device 4 is adsorbed on the magnetic adsorption part 32 as much as possible, and the magnetic adsorption efficiency is fully exerted.

[0033] Embodiment 2

[0034] like Figures 1 to 3 The figure shows a second embodiment of the automatic adsorption device for a low-height refueling pipeline of the utility model.

[0035] This embodiment is similar to the first embodiment, except that: the U-shaped tube 1 is provided with a micro cylinder 5, and the electromagnetic adsorption device 4 is provided at the end of the push rod of the micro cylinder 5, the extension direction of the push rod is perpendicular to the axial direction of the ground well hose 2, and the electromagnetic adsorption device 4 contacts the magnetic attraction part 32 after the micro cylinder 5 extends the push rod. Among them, a fixing plate 51 is provided between the micro cylinder 5 and the U-shaped tube 1, the micro cylinder 5 is fixedly connected to the lower end of the fixing plate 51, the upper end of the fixing plate 51 is fitted and fixed to the U-shaped tube 1, the fixing plate 51 is provided on the side of the U-shaped tube 1 away from the ground well hose 2, and the hook part 31 can be hooked at the position where the fixing plate 51 and the U-shaped tube 1 are fitted. Among them, a ground well connector 6 is provided at the end of the ground well hose 2, and a ground well tray 7 is provided at the end of the U-shaped tube 1, and the ground well connector 6 can be placed on the ground well tray 7, and when the ground well connector 6 is placed on the ground well tray 7, the position of the electromagnetic adsorption device 4 corresponds to that of the magnetic attraction part 32.

[0036] In this embodiment, if Figure 1 to Figure 2 As shown, when the magnetic hook assembly 3 is needed, the micro cylinder 5 is used to extend the push rod to make the electromagnetic adsorption device 4 at the end of the push rod contact with the magnetic attraction part 32. When the hook assembly 3 needs to be removed, the micro cylinder 5 retracts the push rod to disengage the electromagnetic adsorption device 4 from the magnetic attraction part 32, which is convenient for taking and placing.

[0037] In this embodiment, if Figure 2 As shown, the upper end of the fixing plate 51 is fitted and fixed to the U-shaped tube 1, and the micro cylinder 5 is fixedly connected to the lower end of the fixing plate 51, so that the micro cylinder 5 and the U-shaped tube 1 are fixed; because the hook part 31 can be hung at the position where the fixing plate 51 and the U-shaped tube 1 are fitted, the gap of the hook part 31 is reduced and the hanging strength is improved.

[0038] In this embodiment, if Figure 1 and Figure 3 As shown, when the ground well connector 6 is placed on the ground well tray 7, the electromagnetic adsorption device 4 corresponds to the position of the magnetic adsorption part 32, so that the two ends of the ground well hose 2 can maintain a fixed position balance.

[0039] Embodiment 3

[0040] like Figure 1 and Figure 3 The third embodiment of the automatic adsorption device for a low-height refueling pipeline of the utility model is shown.

[0041] This embodiment is similar to the first or second embodiment, except that: a ground well support plate 71 is provided between the U-shaped tube 1 and the ground well tray 7, one end of the ground well support plate 71 is hooked on the U-shaped tube 1, and the other end is connected and fixed to the outer wall of the ground well tray 7. The ground well support plate 71 is provided with an induction switch 72, and when the ground well connector 6 is placed on the ground well tray 7, the outer wall of the ground well connector 6 can trigger the induction switch 72, and the induction switch 72 is connected to the micro cylinder 5 by signal. A delay controller for controlling the start and stop is provided in the electromagnetic adsorption device 4, and the delay controller is connected to the induction switch 72 by signal.

[0042] In this embodiment, if Figure 1 As shown, one end of the ground well support plate 71 is hung on the U-shaped tube 1, and the other end is connected and fixed to the outer wall of the ground well tray 7, so as to achieve the fixation between the ground well tray 7 and the U-shaped tube 1.

[0043] In this embodiment, if Figure 3 As shown, when the ground well connector 6 is placed on the ground well tray 7 and triggers the induction switch 72, since the induction switch 72 is connected to the micro cylinder 5 signal, the micro cylinder 5 extends the push rod after receiving the signal, so that the electromagnetic adsorption device 4 adsorbs the magnetic attraction part 32; when the ground well connector 6 is separated from the ground well tray 7, the induction switch 72 controls the micro cylinder 5 to retract the push rod, so that the electromagnetic adsorption device 4 is separated from the magnetic attraction part 32, thereby realizing intelligent picking and placing.

[0044] In this embodiment, if Figure 3 As shown, when the ground well connector 6 is placed on the ground well tray 7 and triggers the induction switch 72, since the delay controller is connected to the induction switch 72 signal, the delay controller powers on and starts the electromagnetic adsorption device 4 after receiving the signal; when the ground well connector 6 is detached from the ground well tray 7, the delay controller controls the electromagnetic adsorption device 4 to power off and shut down, achieving the effect of automatically starting and stopping the electromagnetic adsorption device 4, avoiding continuous power-on of the electromagnetic adsorption device 4 and reducing energy consumption.

[0045] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. An automatic adsorption device for a low-height refueling pipeline, comprising a U-shaped tube (1), a ground well hose (2), and a hook assembly (3) connected to the ground well hose (2) and capable of being hooked to the U-shaped tube (1), characterized in that: The U-shaped tube (1) is provided with an electromagnetic adsorption device (4) capable of magnetically adsorbing the hook assembly (3).

2. The low-height refueling pipeline automatic adsorption device according to claim 1 is characterized by: The hook assembly (3) comprises a hook portion (31), a magnetic attraction portion (32) connected to the bottom of the hook portion (31), and a sleeve (33) arranged on the magnetic attraction portion (32); the electromagnetic adsorption device (4) can magnetically attract the magnetic attraction portion (32); and the sleeve (33) is sleeved on the outer wall of the underground well hose (2).

3. The automatic adsorption device for a low-height refueling pipeline according to claim 2 is characterized in that: The hook assembly (3) further comprises a support base (34) connected to the lower part of the magnetic attraction portion (32); the support base (34) is arranged below the sleeve (33); and a gap is arranged between the sleeve (33) and the support base (34).

4. The automatic adsorption device for a low-height refueling pipeline according to claim 2 is characterized in that: The U-shaped tube (1) is provided with a micro cylinder (5), and the electromagnetic adsorption device (4) is provided at the end of the push rod of the micro cylinder (5). The extension direction of the push rod is perpendicular to the axial direction of the underground well hose (2). After the push rod of the micro cylinder (5) is extended, the electromagnetic adsorption device (4) contacts the magnetic attraction part (32).

5. The automatic adsorption device for a low-height refueling pipeline according to claim 4 is characterized in that: A fixing plate (51) is provided between the micro cylinder (5) and the U-shaped tube (1); the micro cylinder (5) is fixedly connected to the lower end of the fixing plate (51); the upper end of the fixing plate (51) is fitted and fixed to the U-shaped tube (1); the fixing plate (51) is provided on a side of the U-shaped tube (1) away from the underground well hose (2); and the hook portion (31) can be hooked at a position where the fixing plate (51) and the U-shaped tube (1) are fitted.

6. The automatic adsorption device for a low-height refueling pipeline according to claim 4 is characterized in that: The end of the ground well hose (2) is provided with a ground well connector (6), the end of the U-shaped tube (1) is provided with a ground well tray (7), the ground well connector (6) can be placed on the ground well tray (7), and when the ground well connector (6) is placed on the ground well tray (7), the position of the electromagnetic adsorption device (4) corresponds to that of the magnetic adsorption portion (32).

7. The automatic adsorption device for a low-height refueling pipeline according to claim 6 is characterized in that: A ground well support plate (71) is provided between the U-shaped tube (1) and the ground well tray (7); one end of the ground well support plate (71) is hooked on the U-shaped tube (1), and the other end is connected and fixed to the outer wall of the ground well tray (7).

8. The automatic adsorption device for a low-height refueling pipeline according to claim 7, characterized in that: The ground well support plate (71) is provided with an induction switch (72). When the ground well connector (6) is placed on the ground well tray (7), the outer wall of the ground well connector (6) can trigger the induction switch (72), and the induction switch (72) is connected to the micro cylinder (5) by signal.

9. The automatic adsorption device for a low-height refueling pipeline according to claim 8, characterized in that: The electromagnetic adsorption device (4) is provided with a delay controller for controlling start and stop, and the delay controller is connected to the induction switch (72) by signal.

10. The automatic adsorption device for a low-height refueling pipeline according to claim 2, characterized in that: The electromagnetic adsorption device (4) has a cylindrical shape, and the outer diameter of the electromagnetic adsorption device (4) with a cylindrical shape is smaller than the width of the magnetic attraction portion (32).