Mortise and tenon joint shaft sleeve equipotential assembly of aircraft refueling vehicle

Abstract

The utility model belongs to the technical field of static conductive equipment of a refueling truck, and discloses a mortise and tenon shaft sleeve equipotential assembly of an aircraft refueling truck, which is movably arranged on the refueling truck to connect the refueling truck with an aircraft to form an equipotential relationship, and comprises a winding roll and a bracket, and a static cable for connecting the refueling truck with the aircraft is wound on the winding roll; a main shaft is arranged on the support, the main shaft is fixedly connected with the support, the winding roll is arranged on the main shaft in a sleeving mode and is rotationally connected with the main shaft, and a bearing is arranged at the rotating connection position; the side, close to the support, of the main shaft is sleeved with a tenon copper sleeve, and the tenon copper sleeve is electrically connected with the support. The side, close to the winding roll, of the main shaft is sleeved with a mortise copper sleeve, the mortise copper sleeve is connected with the bearing and is in electric conduction with the static cable by being connected with the winding roll, and the tenon copper sleeve is provided with a conical end inserted into the mortise copper sleeve and is in electric conduction with the mortise copper sleeve through the conical end.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft refueling vehicles, and in particular relates to an isopotential component of a mortise and tenon shaft sleeve of an aircraft refueling vehicle. Background Art

[0002] Aviation fuel is a hazardous chemical, and the accumulation of static electricity can pose a significant safety hazard. There are two main reasons why static electricity can accumulate during the use of aviation fuel: First, when the fuel truck is refueling (pumping) an aircraft, the high-speed flow of the fuel in the pressurized pipeline generates a large amount of static electricity; second, when the fuel in the aircraft tank is sloshed, or when the aircraft engine pumps rapidly, drawing in the flowing fuel, both of which generate a large amount of static electricity.

[0003] When a refueling truck is refueling (pumping fuel) an aircraft, it needs to connect the refueling equipment to the aircraft's fuel tank. If the accumulated static electricity is not effectively eliminated or the potential balance between the refueling truck and the aircraft is not maintained, a potential difference will form between the two, causing static ion discharge, which can lead to unsafe events such as fire and explosion. Therefore, before the operation, the static conductive wire of the static conductive device on the refueling truck must be connected to the static grounding pile on the aircraft to ensure potential balance between the refueling truck and the aircraft, prevent discharge caused by the potential difference, and ensure the safety of the operation, equipment, and personnel.

[0004] The static dissipation device currently installed on aircraft refueling trucks consists of a take-up spool bracket, a main shaft, a take-up spool assembly, an electrostatic conductor, and a grounding clamp. The take-up spool assembly is mounted on the main shaft via a bearing, a bushing, and a spring. When static dissipation or potential balance is required, the electrostatic conductor is pulled out of the take-up spool assembly and connected to the ground with a conductive clamp or to the aircraft's static grounding post. This creates a complete static dissipation path along the route from refueling truck to take-up spool bracket, main shaft, take-up spool assembly, electrostatic conductor, grounding clamp, and aircraft.

[0005] Existing static-dissipation devices have technical flaws: According to Section 6.44 of the "Civil Aviation Fuel Equipment Integrity Technical Specification (MHT6002-2008), the resistance of the static-dissipation cable through the static-dissipation cable clamp should be no greater than 10Ω. This resistance is typically determined by finding the rotational position between the take-up spool assembly and the main shaft during testing, and is commonly referred to as the static resistance value. However, in actual operation, wear, corrosion, oscillation, looseness, and other factors between the take-up spool assembly and the main shaft may not always achieve this rotational position, thus affecting static-dissipation conduction. In some cases, the static-dissipation channel resistance may exceed 10Ω, rendering the test invalid or significantly exceeding the resistance limit. To prevent these situations, static-dissipation devices typically require regular dynamic resistance testing. Even so, frequent and prolonged static-dissipation cable extraction and retraction operations in actual operation can make it difficult to ensure the conductive integrity of the static-dissipation channel, resulting in invalid resistance tests or significantly exceeding the resistance limit. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides a mortise and tenon shaft sleeve equipotential assembly for an aircraft refueling truck, which replaces the sliding conductive connection structure of the existing roller-type equipotential assembly. The mortise and tenon copper sleeve structure arranged on the main shaft increases the conductive contact area and improves the connection and conductive stability.

[0007] The technical solution adopted by this utility model is:

[0008] In a first aspect, the utility model provides an aircraft refueling truck mortise and tenon sleeve equipotential assembly, which is movably arranged on the refueling truck to connect the refueling truck and the aircraft to form an equipotential relationship, including a reel and a bracket, and the reel is wound with an electrostatic cable for connecting the refueling truck and the aircraft;

[0009] The bracket is provided with a main shaft, the main shaft is fixedly connected to the bracket, the winding drum is sleeved on the main shaft and is rotatably connected to the main shaft, and a bearing is provided at the rotating connection;

[0010] A copper sleeve is provided on the main shaft at a side close to the bracket, and the copper sleeve is electrically connected to the bracket;

[0011] A mortise copper sleeve is provided on the main shaft on the side close to the winding reel. The mortise copper sleeve is connected to the bearing and is conductive to the electrostatic cable through the connecting winding reel. The tenon copper sleeve has a tapered end portion inserted into the mortise copper sleeve and is conductively connected to the mortise copper sleeve through the tapered end portion.

[0012] In combination with the first aspect, the present invention provides a first implementation manner of the first aspect, wherein the mortise copper sleeve is rotatably connected to the main shaft, and an opening at one end of the mortise copper sleeve is fixedly connected to an outer sleeve of the bearing.

[0013] In combination with the first embodiment of the first aspect, the present invention provides a second embodiment of the first aspect, wherein the cable reel comprises a rotating drum and circular baffles arranged on both sides of the rotating drum, the bearing is arranged at the center of any layer of the baffles, and the outer sleeve of the bearing is fixedly connected to the baffles;

[0014] The mortise copper sleeve is fixed on the outside of the baffle with an axonometric side, and has a conductor that passes through the baffle and is conductively connected to the end of the electrostatic cable wound on the rotating drum.

[0015] In combination with the first aspect, the utility model provides a third implementation of the first aspect, wherein the mortise copper sleeve and the main shaft have an annular gap, and the annular gap continuously expands toward one side of the tenon copper sleeve to form a conical groove for the conical end of the tenon copper sleeve to be inserted and fitted.

[0016] In combination with the third embodiment of the first aspect, the present invention provides a fourth embodiment of the first aspect, wherein the tapered groove is frictionally connected to the tapered end portion, and the contact surface is a tapered surface.

[0017] In combination with the fourth embodiment of the first aspect, the utility model provides a fifth embodiment of the first aspect, wherein the conical groove has a plurality of annular grooves, and the conical end has a plurality of annular strips inserted into the conical groove for limiting sliding, and the annular grooves, annular strips and the main shaft are coaxial.

[0018] In combination with the first aspect, the present utility model provides a sixth implementation of the first aspect, wherein the tenon copper sleeve is fixedly connected to the main shaft.

[0019] In combination with the first aspect, the present invention provides a seventh implementation of the first aspect, wherein the copper sleeve is slidably connected to the bracket, the bracket is provided with a slide rail, and the copper sleeve is disposed on the slide rail and reciprocates along the axis of the main shaft;

[0020] One end of the tenon copper sleeve passes through the slide rail and is provided with a rod portion on the outer side of the bracket for facilitating the reciprocating motion of the tenon copper sleeve.

[0021] The beneficial effects of the utility model are:

[0022] The utility model improves the existing roller-type equipotential assembly provided on the static-conducting device of a refueling truck, and replaces the existing circular copper sleeve by providing a copper sleeve structure with a mortise and tenon structure on the main shaft of the roller, thereby increasing the static-conducting contact area and improving the stability of the rotational connection, thereby ensuring that a good rotational connection relationship can be maintained during long-term wear. At the same time, by increasing the static-conducting contact area, it is ensured that its resistance can be maintained within the marked range for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1. It is a top view of the mortise and tenon sleeve equipotential assembly in the embodiment of the present utility model;

[0024] Figure 2 This is a first axonometric view of the mortise and tenon sleeve equipotential assembly in an embodiment of the present utility model;

[0025] Figure 3 This is a second axonometric view of the mortise and tenon sleeve equipotential assembly in an embodiment of the present utility model;

[0026] Figure 4 A partial cross-sectional diagram of the embodiment of the present invention when the tenon copper sleeve and the mortise copper sleeve are connected.

[0027] In the figure: 1- bracket, 2- winding drum, 3- tenon copper sleeve, 4- mortise copper sleeve, 5- main shaft, 6- bearing. DETAILED DESCRIPTION

[0028] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of this application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not necessarily imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0034] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] Example 1:

[0036] This embodiment provides a mortise and tenon shaft sleeve equipotential assembly for an aircraft refueling truck. This assembly is based on an existing rotary drum equipotential device installed on an aircraft refueling truck platform, optimizing its conductive connection structure. The rotary drum equipotential device specifically comprises a bracket 1 and a cable reel 2 mounted on the bracket 1. The cable reel 2 is a cylindrical structure comprising a rotating drum and circular baffles disposed on either side of the drum. An electrostatic conductor is wound around the drum of the cable reel 2, connecting the aircraft and the cable reel 2 via the electrostatic conductor to form a conductive connection. The cable reel 2 forms an equipotential state with the refueling truck through its conductive structure, thereby maintaining the equipotential between the refueling truck and the aircraft, thereby preventing the potential difference from generating static electricity that could affect safety during the refueling process.

[0037] Specifically, refer to Figure 1-Figure 3 The equipotential component in this embodiment proposes an optimization solution for the equipotential connection relationship between the cable reel 2 and the refueling truck.

[0038] The brackets 1 are two symmetrical metal frames arranged on the fuel truck platform. A fixed main shaft 5 is provided between the brackets 1, and the winding drum 2 is sleeved on the main shaft 5 and can rotate around the main shaft 5.

[0039] The reel 2 has a channel inside its drum for the spindle 5 to pass through. During installation, one open end of the channel rests against one of the brackets 1, while the other open end has a certain gap with the other bracket 1. Sinks are provided on both open ends of the channel to secure bearings 6, which provide a sliding connection with the spindle 5.

[0040] In a space with a certain gap from the bracket 1 on one side, there is a main shaft 5 part of a certain length exposed between the bracket 1 and the baffle, and two copper sleeves are sleeved on the main shaft 5 part, one is a tenon copper sleeve 3, and the other is a mortise copper sleeve 4.

[0041] Reference Figure 1 The tenon copper sleeve 3 is a conical sleeve structure, which is sleeved on the main shaft 5 and does not rotate relative to the main shaft 5. The other mortise copper sleeve 4 is also a conical structure, with its larger side opening facing the tenon copper sleeve 3 and the smaller side opening fixed on the outer sleeve of the bearing 6, thereby achieving a fixed connection state with the winding reel 2.

[0042] It should be noted that the entire cable reel 2, bracket 1, and main shaft 5 are made of stainless steel, which has conductive properties. However, its resistance cannot meet the standard requirements for static electricity conduction. Therefore, two additional copper sleeve structures are provided to reduce resistance and improve static electricity conduction performance.

[0043] Furthermore, the tenon copper sleeve 3 has a tapered end face that extends toward one side of the mortise copper sleeve 4. The mortise copper sleeve 4 is colinear with the axis of the main shaft 5 and undergoes relative rotational displacement with the main shaft 5. The tapered end face of the tenon copper sleeve 3 is inserted into the larger opening of the mortise copper sleeve 4 and conforms to the tapered groove inside the mortise copper sleeve 4, forming a large annular contact area when fitted.

[0044] The tenon copper sleeve 3 and the mortise copper sleeve 4 will rotate relative to each other when the winding reel 2 rotates. Compared with the conductive method of end faces abutting each other in the prior art, this conical surface fitting and rotating setting method can further improve stability, while avoiding long-term friction that causes wear of the contact surface and increases resistance. Because the contact surface is large enough, even with a certain degree of wear, its resistance is always maintained below the limit.

[0045] Furthermore, in order to improve connection stability, another implementation is provided.

[0046] The mortise copper sleeve 4 is also fixed on the outer sleeve of the bearing 6. The end of the electrostatic wire wrapped around the drum passes through the center of the drum or the baffle on the same side and is directly conductively connected to the mortise copper sleeve 4. At the same time, the connecting end of the electrostatic wire is also fixed to the drum by welding or other means to provide stability.

[0047] The tenon copper sleeve 3 is a structure that is slidably connected to the bracket 1. A slide rail is provided on the bracket 1. The slide rail is a through hole provided on the bracket 1, and the inner wall of the through hole extends to both sides in the axial direction to form a tubular structure. The tenon copper sleeve 3 is sleeved on the main shaft 5 and is linearly slidably connected to the main shaft 5. It has an extended rod portion, which is inserted into the tubular structure of the bracket 1 to achieve sliding fit, and the rod portion has an operating end on the outside after passing through the tubular structure, which is convenient for people to use.

[0048] That is, when not in use, the tenon copper sleeve 3 and the mortise copper sleeve 4 maintain a certain gap and are in an unconnected state. Then, when in use, first pull the electrostatic wire to cause the cable reel 2 to rotate. When one end of the electrostatic wire is connected to the aircraft, the operating rod is used to push the tenon copper sleeve 3 to slide toward the side of the cable reel 2, and finally embed it into the mortise copper sleeve 4 to form an interlocking fixation, thereby forming a conductive state. This setting method can further improve its conductive stability. Compared with the previous embodiment, it does not need to maintain the continuous connection between the mortise copper sleeve 4 and the tenon copper sleeve 3. When the cable reel 2 rotates, the two structures have a certain distance and no friction. The conductive fit is only achieved after the cable reel 2 is fixed.

[0049] The present invention is not limited to the above optional embodiments. Anyone can derive various other forms of products based on the inspiration of the present invention. The above specific embodiments should not be construed as limiting the scope of protection of the present invention. The scope of protection of the present invention shall be based on the scope defined in the claims, and the specification can be used to interpret the claims.

Claims

1. An aircraft refueling truck mortise and tenon sleeve equipotential assembly, movably mounted on the refueling truck to connect the refueling truck and the aircraft to form an equipotential relationship, characterized by: The invention comprises a cable reel (2) and a bracket (1), wherein an electrostatic cable for connecting a refueling vehicle and an aircraft is wound on the cable reel (2); The bracket (1) is provided with a main shaft (5), the main shaft (4) is fixedly connected to the bracket (1), the winding drum (2) is sleeved on the main shaft (4) and is rotatably connected to the main shaft (4), and a bearing (6) is provided at the rotatable connection; A copper sleeve (3) is sleeved on the main shaft (4) at a side close to the bracket (1), and the copper sleeve (3) is electrically connected to the bracket (1); A mortise copper sleeve (4) is sleeved on the main shaft (4) on a side close to the winding reel (2). The mortise copper sleeve (4) is connected to the bearing (6) and is electrically conductive to the electrostatic cable through the connection to the winding reel (2). The tenon copper sleeve (3) has a tapered end portion inserted into the mortise copper sleeve (4) and is electrically connected to the mortise copper sleeve (4) through the tapered end portion.

2. The mortise and tenon sleeve equipotential assembly for an aircraft refueling truck according to claim 1, characterized in that: The mortise copper sleeve (4) is rotatably connected to the main shaft (4), and one end opening of the mortise copper sleeve (4) is fixedly connected to the outer sleeve of the bearing (6).

3. The equipotential assembly of the mortise and tenon sleeve of an aircraft refueling truck according to claim 2, characterized in that: The cable reel (2) comprises a rotating drum and circular baffles arranged on both sides of the rotating drum, the bearing (6) is arranged at the center position of any layer of the baffles, and the outer sleeve of the bearing (6) is fixedly connected to the baffles; The copper sleeve (4) is fixed on the outside of the baffle with the axonometric (6) side, and has a conductor that passes through the baffle and is electrically connected to the end of the electrostatic cable wound on the drum.

4. The aircraft refueling truck mortise and tenon sleeve equipotential assembly according to claim 1, characterized in that: The mortise copper sleeve (4) and the main shaft (4) have an annular gap, and the annular gap continuously expands toward one side of the tenon copper sleeve (3) to form a tapered groove for the tapered end of the tenon copper sleeve (3) to be inserted and fitted.

5. The aircraft refueling truck mortise and tenon sleeve equipotential assembly according to claim 4, characterized in that: The tapered groove is frictionally connected to the tapered end portion, and the contact surface is a tapered surface.

6. The aircraft refueling truck mortise and tenon sleeve equipotential assembly according to claim 5, characterized in that: The conical groove has a plurality of annular grooves, and the conical end has a plurality of annular strips inserted into the conical groove for limited sliding. The annular grooves, the annular strips and the main shaft (5) are coaxial.

7. The aircraft refueling truck mortise and tenon sleeve equipotential assembly according to claim 1, characterized in that: The tenon copper sleeve (3) is fixedly connected to the main shaft (5).

8. The aircraft refueling truck mortise and tenon sleeve equipotential assembly according to claim 1, characterized in that: The copper sleeve (3) is slidably connected to the bracket (1); a slide rail is provided on the bracket (1); the copper sleeve (3) is arranged on the slide rail and reciprocates along the axis direction of the main shaft (5); One end of the tenon copper sleeve (3) passes through the slide rail and is provided with a rod portion on the outside of the bracket (1) for facilitating the reciprocating movement of the tenon copper sleeve (3).

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