Oil gun and oil filling system

Abstract

The invention provides an oil gun and an oil filling system, the oil gun is configured to be electrically connected with a control system, and the oil gun comprises a gun nozzle and a gun body with an oil supply main path; the sensing device is used for sensing liquid level information; the control valve is used for controlling connection and disconnection between the oil supply main path and the gun nozzle in the oil inlet direction; a communication link is established among the control valve, the sensing device and the control system, the communication link can transmit a preset signal based on the liquid level information, and the control valve is configured to be controlled to be opened or closed based on the preset signal through the control system. According to the design of the oil gun, the structure of the tail end of the mechanical arm can be simplified, so that the tail end of the mechanical arm does not need to be provided with a special mechanical transmission structure, and the oil gun can be operated.

Description

Technical Field

[0001] The present application relates to the technical field of fuel filling equipment, and in particular to a refueling gun and a refueling system. Background Art

[0002] With the development of science and technology, automated robots are gradually being used in various industries, including the automatic refueling industry at gas stations. Refueling robots have been piloted in some gas stations and have achieved good results.

[0003] At present, the refueling robot is equipped with a refueling gun during the refueling process. When the refueling robot needs to refuel the car, the refueling robot's mechanical arm drives the refueling gun to move to the specified position and operates the switch handle of the refueling gun to open the refueling gun for refueling. Among them, the switch mechanism of the refueling gun is a relatively complex mechanical structure, which requires a special mechanical transmission structure to be set at the end of the mechanical arm to complete the operation of the switch handle of the refueling gun, and puts forward relatively high requirements on the positioning accuracy of the end of the mechanical arm. Summary of the invention

[0004] In order to solve at least one technical problem existing in the prior art, one object of the present application is to provide a refueling gun and a refueling system, the design of which can simplify the structure of the end of a robotic arm so that the end of the robotic arm does not need to be equipped with a special mechanical transmission structure to complete the operation of the refueling gun.

[0005] To achieve at least one of the above purposes, the present application adopts the following technical solutions:

[0006] A refueling gun is configured to be electrically connected to a control system, the refueling gun comprising: a gun nozzle and a gun body having a main oil supply path; a sensing device for sensing and representing liquid level information; a control valve for controlling the connection and disconnection between the main oil supply path and the gun nozzle in the oil inlet direction;

[0007] A communication link is established between the control valve, the sensing device and the control system, and the communication link can transmit a preset signal based on the liquid level information. The control valve is configured to be controlled to be opened or closed by the control system based on the preset signal.

[0008] As a preferred embodiment, the sensing device includes: a pressure chamber, arranged in the gun body; a pressure sensing unit, used to sense the pressure inside the pressure chamber; a sensing pipeline arranged in the gun nozzle, the sensing pipeline is connected to the pressure chamber, and a sensing through hole connected to the sensing pipeline is provided on the side wall of the gun nozzle.

[0009] As a preferred embodiment, the gun nozzle has a chamber, an oil and gas recovery air path is also arranged in the chamber, an oil and gas recovery through hole connected to the oil and gas recovery air path is arranged on the side wall of the gun nozzle, the oil and gas recovery air path is connected to the induction pipeline through a branch pipe, the branch pipe is located upstream of the oil and gas recovery through hole in the oil inlet direction, and the oil and gas recovery air path is connected to a vacuum pump.

[0010] As a preferred embodiment, the oil and gas recovery gas path is arranged at the lower part of the chamber relative to the sensing pipeline, and the oil and gas recovery through hole is located upstream of the sensing through hole in the oil inlet direction.

[0011] As a preferred embodiment, the refueling gun further includes: a recovery cover, which is connected to the gun nozzle and the connection position is located upstream of the oil and gas recovery hole, and the outer contour size of the recovery cover is larger than the outer diameter of the gun nozzle.

[0012] As a preferred embodiment, the sensing device further comprises: an optical fiber liquid level switch arranged on the side wall of the gun nozzle or inside the gun nozzle, the optical fiber liquid level switch is used to sense liquid and is in a cut-off state after sensing liquid.

[0013] As a preferred embodiment, the pressure sensing unit is a pressure switch, which is configured to be in a cut-off state after sensing that the pressure reaches a threshold value; the control system controls the control valve to close in response to at least one of the pressure switch and the optical fiber liquid level switch being in a cut-off state.

[0014] As a preferred implementation manner, a cable interface is provided on the gun body, and the control system is connected to the pressure switch, the optical fiber liquid level switch and the control valve via the cable interface.

[0015] As a preferred embodiment, the refueling gun includes: an explosion-proof junction box, the cable interface has multiple ones and is arranged on the explosion-proof junction box, the control valve is connected to the explosion-proof junction box through a first connecting device, the pressure switch is connected to the explosion-proof junction box through a second connecting device, and the optical fiber liquid level switch is connected to the explosion-proof junction box through a third connecting device.

[0016] As a preferred implementation, the control valve is a solenoid valve, and the control system is configured to supply power to the solenoid valve.

[0017] A refueling system comprises any one of the above-mentioned refueling guns and a control system.

[0018] As a preferred embodiment, it further comprises a refueling robot, and the refueling gun is attached to the refueling robot.

[0019] Beneficial effects:

[0020] The refueling gun and refueling system provided in the embodiment of the present application use a control valve to replace the switch handle of the traditional refueling gun, and by establishing a communication link between the control valve and the sensing device and the control system, the control system can directly control the opening or closing of the control valve. The refueling gun can reduce the complexity of the mechanical arm of the refueling robot, so that the end of the mechanical arm does not need to be provided with a special mechanical transmission structure, and the end of the mechanical arm only needs to play the role of clamping the refueling gun, which simplifies the structure of the refueling robot, reduces the weight of the mechanical arm of the refueling robot and improves its stability.

[0021] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0022] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0023] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 Shown is a schematic diagram of the structure of a refueling gun in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 1. Control valve; 2. Explosion-proof junction box; 3. Pressure chamber; 4. Pressure sensing unit; 5. Fiber optic liquid level switch; 6. Gun nozzle; 7. Recovery cover; 21. First connecting device; 22. Second connecting device; 23. Third connecting device; 24. Fourth connecting device; 61. Oil and gas recovery air path; 62. Oil and gas recovery through hole; 63. Sensing pipeline; 64. Sensing through hole; 65. Branch pipe. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] like Figure 1 As shown, the present specification provides a refueling gun, which is configured to be electrically connected to a control system (not shown), and the refueling gun includes: a nozzle 6 and a gun body with a main oil supply path; a sensing device for sensing liquid level information; a control valve 1, which is used to control the connection between the main oil supply path and the nozzle 6 in the oil inlet direction; a communication link is established between the control valve 1, the sensing device and the control system, and the communication link can transmit a preset signal based on the liquid level information, and the control valve 1 is configured to be controlled to be opened or closed by the control system based on the preset signal.

[0032] The fueling gun provided in this specification uses a control valve to replace the switch handle of a traditional fueling gun, and by establishing a communication link between the control valve and the sensing device and the control system, the control system can directly control the opening or closing of the control valve. The fueling gun can reduce the complexity of the mechanical arm of the fueling robot, so that the end of the mechanical arm does not need to be provided with a special mechanical transmission structure.

[0033] The main oil supply line of the refueling gun is connected to the refueling pump. When the refueling pump is started and the control valve is open, the oil is pumped out by the refueling pump through the main oil supply line, control valve, gun nozzle, and then supplied to the fuel tank. When refueling in a fixed quantity, after the control system starts refueling, it controls the start and stop of the refueling system according to the accumulated flow of the flow meter. At this time, the control valve of the refueling gun is completely controlled by the control system of the refueling robot. When the flow meter accumulates to the specified flow, the control system issues a stop command, and the control valve and refueling pump are closed, and the refueling process ends.

[0034] In this specification, the control valve 1 has an open state and a closed state. In the open state, the oil can reach the gun nozzle 6 through the main oil supply path; in the closed state, the oil can be blocked and will not be supplied to the gun nozzle 9. In order to realize the electric control of the control valve 1 by the control system, the control valve 1 is preferably a solenoid valve. When the control valve 1 is a solenoid valve, the control system is also configured to provide electrical energy to the solenoid valve, thereby controlling the solenoid valve to be closed or disconnected after power is supplied, so as to realize the connection and disconnection between the main oil supply path and the gun nozzle 6.

[0035] When a refueling gun is refueling a fuel tank, it is often necessary to determine whether the fuel tank is full. A conventional refueling gun is equipped with an automatic gun jump mechanism. After determining that the fuel tank is full, the automatic gun jump mechanism inside the refueling gun closes the valve to stop the continued supply of fuel. In this specification, the refueling gun is equipped with a sensing device to determine whether the fuel tank is full.

[0036] In some embodiments, the sensing device includes: a pressure chamber 3, arranged in the gun body; a pressure sensing unit 4, used to sense the pressure inside the pressure chamber 3; a sensing pipeline 63 arranged in the gun nozzle 6, the sensing pipeline 63 is connected to the pressure chamber 3, and a sensing through hole 64 connected to the sensing pipeline 64 is provided on the side wall of the gun nozzle 6.

[0037] Specifically, the pressure chamber 63 is connected to the sensing pipeline 63, and the sensing pipeline 63 is connected to the sensing through hole 64 on the side wall of the gun nozzle 6. The sensing through hole 64 is generally located upstream of the outlet of the gun nozzle 6. As the gasoline is added to the fuel tank, the air in the fuel tank continuously enters the sensing pipeline 63 through the sensing through hole 64, and enters the pressure chamber 3 along the sensing pipeline 63. However, when the fuel tank is almost full or even the oil blocks the sensing through hole 64, no gas will enter the pressure chamber 3 along the sensing pipeline 63, which causes the pressure in the pressure chamber 3 to change. After sensing this change, the pressure sensing unit 4 can transmit a preset signal to the control system through the communication link, and then the control system controls the control valve 1 to close, so as to cut off the main oil supply route to supply oil to the gun nozzle 6.

[0038] The pressure sensing unit 4 is preferably a pressure switch, which is disconnected after reaching a threshold value. The control system controls the control valve 1 to close in response to a disconnected signal on the communication link, wherein the threshold value may be an empirical value.

[0039] In order to ensure that the air in the oil tank can enter the pressure chamber 3 during the filling process, a negative pressure needs to be formed upstream of the sensing line 63 to suck the air into the sensing line 63 and into the pressure chamber 3.

[0040] In some embodiments, the gun nozzle 6 has a chamber, and an oil and gas recovery air path 61 is also arranged in the chamber. An oil and gas recovery through hole 62 connected to the oil and gas recovery air path 61 is arranged on the side wall of the gun nozzle 6. The oil and gas recovery air path 61 is connected to the induction pipeline 63 through a branch pipe 65. In the oil inlet direction, the branch pipe 65 is located upstream of the oil and gas recovery through hole 62. The oil and gas recovery air path 61 is connected to a vacuum pump (not shown).

[0041] During the refueling process, the control system starts the vacuum pump. Since the vacuum pump is connected to the oil and gas recovery gas path 61, the gas enters the vacuum pump through the oil and gas recovery through hole 62 and the oil and gas recovery gas path 61, and a small part of the gas enters the vacuum pump through the sensing pipeline 63 and the branch pipe 65. At this time, the pressure chamber 3 connected to the sensing pipeline 63 is in a slightly negative pressure state. Under the slightly negative pressure state, during the refueling process, the air in the fuel tank will enter the pressure chamber 3 through the oil and gas recovery through hole 62 and the sensing pipeline 63. The branch pipe is a pipeline with a relatively small diameter.

[0042] In this embodiment, the vacuum pump can not only provide a negative pressure state for the pressure chamber 3, but also recover oil and gas during the refueling process. Further, the oil and gas recovery gas path 61 is arranged at the lower part of the chamber of the nozzle 6 relative to the sensing pipeline 63, and the oil and gas recovery through hole 62 is located upstream of the sensing through hole 64 in the oil inlet direction, so as to more effectively absorb the volatilized oil and gas.

[0043] In this specification, the refueling gun further includes: a recovery cover 7, the recovery cover 7 is connected to the gun nozzle 6 and the connection position is located upstream of the oil and gas recovery through hole 62, and the outer contour size of the recovery cover 7 is larger than the outer diameter of the gun nozzle 6. In this embodiment, the recovery cover 7 is provided on the gun nozzle 6 to more effectively collect oil and gas, and as much oil and gas as possible can be recovered through the oil and gas recovery through hole 62. The outer contour size of the recovery cover 7 is also larger than the outer diameter of the vehicle tank port.

[0044] In some embodiments, the sensing device further comprises: an optical fiber liquid level switch 5 disposed on the side wall of the gun nozzle 6 or inside the gun nozzle 6, the optical fiber liquid level switch 5 is used to sense liquid and is in a cut-off state after sensing liquid. Specifically, when the optical fiber liquid level switch 5 is disposed on the side wall of the gun nozzle 6, the side wall is provided with a groove for installing the optical fiber liquid level switch 5. The optical fiber liquid level switch 5 is a normally closed type, and when the optical fiber probe contacts the liquid surface, the liquid level switch is automatically disconnected.

[0045] In this embodiment, the fueling gun adopts two ways of jumping the gun to improve the reliability of the gun jumping. The gun jumping can be completed by satisfying either of the two ways. When the gasoline oil level reaches the sensing through hole 64, the gasoline will block the sensing through hole 64. Since no gas enters the pressure chamber 3 along the sensing pipeline 63, the pressure in the pressure chamber 3 will further decrease, that is, the negative pressure in the pressure chamber 3 will increase and reach the threshold. And when the gasoline oil level contacts the optical fiber liquid level switch 5, the optical fiber refractive index changes. If either of the above two situations is satisfied, the control system controls the control valve 1 to close and refueling stops.

[0046] In some embodiments, the pressure sensing unit 4 is a pressure switch, which is configured to be in a cut-off state after sensing that the pressure reaches a threshold value; the control system controls the control valve 1 to close in response to at least one of the pressure switch and the optical fiber liquid level switch 5 being in a cut-off state.

[0047] Furthermore, the control valve 1 is preferably a solenoid valve, and the control system is configured to supply power to the solenoid valve. The solenoid valve, the pressure switch and the optical fiber liquid level switch are connected in series. Since a series control loop is formed, when any one of the pressure switch and the optical fiber liquid level switch is disconnected, the entire series control loop is broken, and the control system can cut off the power supply to the solenoid valve coil. During the refueling process, when the control system of the fuel dispenser detects that the refueling flow is zero, the control system turns off the refueling pump and stops the power supply to the refueling gun, and the refueling process ends.

[0048] In this embodiment, when either the pressure switch or the optical fiber liquid level switch is disconnected, the control system cuts off the power supply circuit of the solenoid valve, the solenoid valve is electrically closed, and the communication link sends a preset signal to the control system. After the optical fiber liquid level switch and the pressure switch are restored, the control valve 1 will not be opened again.

[0049] In this embodiment, the control system has a detection module, which can detect the current value of the communication link. When a circuit break occurs on the communication link, the current value decreases rapidly or drops to 0A, and the solenoid valve is controlled to be closed based on the detected current value. The pressure switch, the optical fiber liquid level switch, the control system, and the solenoid valve form a series control loop, and the control system supplies power to the solenoid valve to provide electrical energy. The solenoid valve is normally open or normally closed. Preferably, the solenoid valve is a direct-acting normally closed type, and the working voltage is selected as 24VDC. The control system applies a 24V DC voltage to the solenoid valve and detects the current of the entire control loop. When the control system issues a refueling command, a 24V DC voltage is provided to the refueling gun while starting the refueling pump. When the control system detects that the control loop current is less than the threshold, the control system determines that the refueling operation is completed and cuts off the 24V power supply.

[0050] In order to form a series circuit, in this specification, a cable interface is provided on the gun body, and the control system is connected to the pressure switch, the optical fiber liquid level switch 5 and the control valve 1 through the cable interface. By forming a series circuit between the pressure switch, the optical fiber liquid level switch, the control system and the solenoid valve, the communication link can respond quickly. When at least one of the pressure switch and the optical fiber liquid level switch is in the cut-off state, the solenoid valve automatically loses power and disconnects. At this time, the control system detects the current value of the series control circuit and cancels the power supply to the solenoid valve, that is, the solenoid valve is in the closed state, and then the refueling gun is pulled out, and the refueling gun will not be re-triggered to refuel.

[0051] Specifically, the fuel gun includes: an explosion-proof junction box 2, the cable interface has multiple ones and is arranged on the explosion-proof junction box 2, the control valve 1 is connected to the explosion-proof junction box 2 through a first connecting device 21, the pressure switch is connected to the explosion-proof junction box 2 through a second connecting device 22, and the optical fiber liquid level switch 5 is connected to the explosion-proof junction box 2 through a third connecting device 23. Therefore, a communication link is formed between the first connecting device 21, the second connecting device 22, and the third connecting device 23, and the control system is also connected to the explosion-proof junction box 2 through a fourth connecting device 24. The first connecting device 21, the second connecting device 22, the third connecting device 23, and the fourth connecting device are specifically cables.

[0052] This specification also provides a refueling system, including any of the above-mentioned refueling guns and control systems. The refueling system provided in this specification can achieve the technical problems solved by the above-mentioned embodiments and correspondingly achieve the technical effects of the above-mentioned implementation methods, and the specific application will not be repeated here.

[0053] In this specification, the refueling system also includes a refueling robot, and the refueling gun is attached to the refueling robot. When the refueling gun is used in conjunction with the refueling robot, a conventional hose can be used to connect to the refueling machine to reliably fix the mechanical arm of the refueling robot and the refueling gun.

[0054] In one application scenario, when the refueling robot needs to refuel a car, the refueling robot's mechanical arm drives the oil gun to move to the designated position, opens the car's fuel tank cap, and moves the refueling gun to the designated position. At this time, the refueling gun is still in standby mode, and the control valve is closed. The control system can provide a DC voltage to the refueling gun to open the solenoid valve. When the control system issues a refueling command, the refueling pump is started, and the oil enters the gun nozzle through the solenoid valve to refuel the car's fuel tank.

[0055] The control system of the refueling robot sends out a command, the refueling pump and the solenoid valve of the oil gun are opened at the same time, the oil circuit of the refueling gun is connected, and gasoline is added to the vehicle through the refueling gun. During the refueling operation of the refueling robot, when the fuel tank is full, the gasoline contacts the optical fiber liquid level switch. When the optical fiber liquid level switch detects that the change in deflection rate reaches the threshold, the liquid level switch disconnects and cuts off the power supply to the solenoid valve, and the solenoid valve loses power and closes. At this time, the control system detects that the refueling flow rate has returned to zero, and the refueling robot stops the refueling operation. Alternatively, when the fuel tank is full, the liquid does not pass through the sensing through hole, the sensing through hole is blocked by gasoline, and the oil and gas recovery vacuum pump is still in operation. At this time, the pressure of the sensing pipeline and the pressure chamber is further reduced. After reaching the threshold, the pressure switch disconnects and cuts off the power supply to the solenoid valve, and the solenoid valve loses power and closes. At this time, the control system detects that the refueling flow rate has returned to zero, and the refueling robot stops the refueling operation.

[0056] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0057] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A refueling gun, characterized in that: The fueling gun is configured to be electrically connected to a control system, and comprises: a nozzle and a gun body having a main oil supply path; a sensing device for sensing and representing liquid level information; a control valve for controlling the on-off between the main oil supply path and the nozzle in the oil inlet direction; A communication link is established between the control valve, the sensing device and the control system, and the communication link can transmit a preset signal based on the liquid level information. The control valve is configured to be controlled to be opened or closed by the control system based on the preset signal.

2. The refueling gun according to claim 1, characterized in that: The sensing device includes: a pressure chamber, which is arranged in the gun body; a pressure sensing unit, which is used to sense the pressure inside the pressure chamber; a sensing pipeline arranged in the gun nozzle, the sensing pipeline is connected to the pressure chamber, and a sensing through hole connected to the sensing pipeline is arranged on the side wall of the gun nozzle.

3. The refueling gun according to claim 2, characterized in that: The gun nozzle has a chamber, and an oil and gas recovery air path is also arranged in the chamber. An oil and gas recovery through hole connected to the oil and gas recovery air path is arranged on the side wall of the gun nozzle. The oil and gas recovery air path is connected to the induction pipeline through a branch pipe. In the oil inlet direction, the branch pipe is located upstream of the oil and gas recovery through hole. The oil and gas recovery air path is connected to a vacuum pump.

4. The refueling gun according to claim 3, characterized in that: The oil and gas recovery gas path is arranged at the lower part of the chamber relative to the sensing pipeline, and the oil and gas recovery through hole is located upstream of the sensing through hole in the oil inlet direction.

5. The refueling gun according to claim 3, characterized in that: The refueling gun further includes: a recovery cover, which is connected to the gun nozzle and the connection position is located upstream of the oil and gas recovery through hole, and the outer contour size of the recovery cover is larger than the outer diameter of the gun nozzle.

6. The refueling gun according to claim 2, characterized in that: The sensing device further comprises: an optical fiber liquid level switch arranged on the side wall of the gun nozzle or inside the gun nozzle, wherein the optical fiber liquid level switch is used for sensing liquid and is in a cut-off state after sensing liquid.

7. The refueling gun according to claim 6, characterized in that: The pressure sensing unit is a pressure switch, which is configured to be in a cut-off state after sensing that the pressure reaches a threshold value; the control system controls the control valve to close in response to at least one of the pressure switch and the optical fiber liquid level switch being in a cut-off state.

8. The refueling gun according to claim 7, characterized in that: The gun body is provided with a cable interface, and the control system is connected with the pressure switch, the optical fiber liquid level switch and the control valve through the cable interface.

9. The refueling gun according to claim 8, characterized in that: The refueling gun includes: an explosion-proof junction box, the cable interface has multiple ones and is arranged on the explosion-proof junction box, the control valve is connected to the explosion-proof junction box through a first connecting device, the pressure switch is connected to the explosion-proof junction box through a second connecting device, and the optical fiber liquid level switch is connected to the explosion-proof junction box through a third connecting device.

10. The refueling gun according to claim 9, characterized in that: The control valve is a solenoid valve, and the control system is configured to supply power to the solenoid valve.

11. A refueling system, characterized in that: It comprises a refueling gun and a control system as described in any one of claims 1 to 10.

12. The refueling system according to claim 11, characterized in that: Also included is a refueling robot, to which the refueling gun is attached.

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