Electrically assisted device for a static guide disk of an aircraft refueling vehicle

Abstract

The present application relates to aviation fuel filling technical field, specifically to a kind of airplane refueling vehicle guide static disc electric auxiliary device, including inner tube, outer tube, drive motor and torque output head. Inside the inner tube is provided with normally open microswitch, the second outer cylinder body closed end is provided with the top post coaxial with microswitch trigger end and with initial gap, must simultaneously satisfy torque output head abutting against winding shaft and when down second outer cylinder body, motor can be started. Non-contact magnetic coupling made of samarium-cobalt magnet is used in transmission chain, which automatically slips and idles when the load exceeds the limit, avoiding pulling the wire core. In addition, the device also drives the sleeve shaft to move axially through the fork mechanism, and the locking state of the ball lock pin and the braking state of the driven cylinder are linked and interlocked. The present application solves the problems of low efficiency of traditional winding, lack of error-proof interlocking of ordinary electric tools, and the risk of easy spark and easy pulling of wire core in rigid transmission. The structure is simple, easy to operate, and suitable for industrialization and popularization.

Description

Technical Field

[0001] This invention belongs to the field of aviation fuel refueling technology, specifically relating to an electric auxiliary device for an aircraft refueling truck's electrostatic discharge tray. Background Technology

[0002] The static discharge plate is a special static discharge device widely used in high-risk fields such as aviation fuel refueling. It is usually rigidly fixed to the main beam or chassis side wall of the refueling truck.

[0003] From a physical structure perspective, existing electrostatic discharge discs mainly consist of a disc-shaped rigid mounting base and a winding assembly. The rigid mounting base, serving as the overall load-bearing frame, is typically made of a high-strength metal material with excellent conductivity. An accommodating cavity is formed inside the base, and a winding shaft is rotatably positioned at the center of this cavity. This winding shaft usually has a slot or internal spline of a specific shape at its center.

[0004] Tens of meters of conductive wire are wound inside the cavity. The conductive wire is usually made of multi-strand highly conductive metal wire cores covered with an elastic insulating sheath. The inner end of the conductive wire is fixed to the winding shaft and maintains electrical continuity, while its free end extending outward is fixedly connected to a metal alligator clip or a special splice clip.

[0005] In specific fuel refueling operations, to prevent the accumulation of static charge caused by the friction of high-speed fuel flow, which could lead to fires and explosions, refueling trucks are generally equipped with two or more static discharge trays. During operation, the operator first pulls out the cable of the first static discharge tray and uses alligator clips to clamp it to the grounding post on the apron for grounding. It should be noted that aviation refueling trucks are specialized vehicles; their internal structure is connected by multiple strands of copper wire, and they are equipped with grounding drag chains on the underside of the main beams and conductive tires. Therefore, grounding the first cable effectively discharges the static electricity from the vehicle itself. Subsequently, the operator pulls out the cable of the second static discharge tray and uses alligator clips to clamp it to a designated discharge point on the aircraft fuselage to form a connection. Through this physical connection, a complete equipotential body is established between the aircraft, the refueling truck, and the ground, ensuring that static electricity in the work area can be safely and promptly discharged to the ground.

[0006] However, after the refueling operation is completed, the winding of the static-conducting wire, which is tens of meters long, is difficult. Due to the safety restrictions of the airport apron, it currently relies mainly on manual operation by inserting a hand-cranked pin into the winding shaft for purely mechanical passive winding. This is not only time-consuming and labor-intensive, but also reduces the efficiency of aircraft refueling operations.

[0007] To improve winding efficiency, some workers have tried using portable screwdrivers and other commercially available electric drills to replace manual winding. However, these non-customized power tools pose safety hazards in the flammable and explosive environment of aircraft refueling. First, the switch and output of a regular electric drill are rigidly linked. The operator can easily accidentally activate the switch before the drill bit is fully aligned and inserted into the center slot of the electrostatic discharge plate, causing the drill bit to spin at high speed in the air. Once the high-speed spinning metal drill bit strikes the metal base of the electrostatic discharge plate, it will instantly generate mechanical sparks, which will ignite the aviation kerosene vapors that are spreading in the surrounding area.

[0008] Secondly, while the outer insulation of the conductive wire is highly elastic, the internal fine copper core has extremely poor ductility. Ordinary power tools use rigid gear reduction transmission. When the alligator clip accidentally gets stuck under the aircraft landing gear or tire during the winding process, the torque of the power tool will suddenly burst, and even if the outer insulation is not damaged, it will forcibly break the internal copper core, forming a hidden open circuit. As a result, the surface of the cable may appear to be intact, but in fact, the equipotential discharge network has failed. Summary of the Invention

[0009] This is one of the technical problems that exist in the current technology, namely, the low efficiency of manual winding, the risk of impact sparks caused by the lack of mechanical anti-misoperation interlocks in conventional electric equipment, and the risk of hidden open circuits caused by the lack of flexible protection in rigid transmission when encountering cable jams in complex apron conditions.

[0010] This invention provides an electric auxiliary device for the electrostatic discharge tray of an aircraft refueling truck.

[0011] The technical solution adopted in this invention is as follows: An electric auxiliary device for an aircraft refueling truck's electrostatic discharge tray includes an inner cylinder and an outer cylinder. The inner cylinder includes a cylinder body and two opposing ends that form a seal around the cylinder body. The opposing ends are respectively provided with a first through hole and a second through hole. A drive motor is installed inside the cylinder. The output end of the drive motor passes through the first through hole and is connected to a torque output head for driving the electrostatic discharge disk winding shaft to rotate. A normally open micro switch electrically connected to the drive motor is also installed inside the cylinder. The trigger end of the normally open micro switch is installed in the second through hole. The outer cylinder includes a second outer cylinder body that is closed at one end, and the second outer cylinder body is slidably sleeved on the end of the inner cylinder where a second through hole is opened; A top post and an elastic telescopic post are provided between the inner bottom wall and the end of the closed end of the second outer cylinder; the fixed end of the elastic telescopic post is fixed to the inner bottom wall, and the free end abuts against the end; the top post is coaxially arranged with the second through hole, one end is fixed to the inner bottom wall, and there is an initial gap between the other end and the trigger end, which is less than the maximum compression stroke of the elastic telescopic post.

[0012] Furthermore, an axially extending guide groove is provided on the inner wall surface of the second outer cylinder, and a guide key matching the shape of the guide groove is provided on the outer wall surface of the cylinder, with the guide key slidably installed in the guide groove.

[0013] Furthermore, the outer cylinder also includes a first outer cylinder body with an end cap at one end, and the first outer cylinder body is fixedly sleeved on the end of the inner cylinder where a first through hole is opened; The end cover is provided with a through hole and a bearing, both of which are coaxial with the output end of the drive motor. The bearing includes an inner ring and an outer ring, and the outer ring is fixed on the end cover. The first outer cylinder is equipped with a magnetic induction coupler coaxial with the output end of the drive motor. The magnetic induction coupler includes a coaxially nested active cylinder and a driven cylinder, with an air gap between the active cylinder and the driven cylinder. One end of the driving cylinder is fixedly connected to the output end of the drive motor, and one end of the driven cylinder passes through the through hole and is fixedly connected to the inner ring of the bearing; the torque output head is coaxially fixedly connected to the end of the driven cylinder that passes through the through hole.

[0014] Furthermore, the first outer cylinder is also provided with a ball locking pin coaxial with the driven cylinder; The ball locking pin includes an annular wall provided on the end cap, and a plurality of ball holes are provided through the annular wall, each of which accommodates a ball. It also includes a sleeve disposed in the first outer cylinder and coaxial with the annular wall. The sleeve is provided with a driving device for driving the sleeve to slide axially. The outer wall surface of the sleeve has a pushing section for radially pushing the ball, causing the ball to partially protrude and enter the external mating groove, and a yielding section for releasing the radial pushing of the ball.

[0015] Furthermore, the drive unit includes a shift fork mechanism, which includes a pressing arm and a drive arm; One end of the pressing arm is fixedly connected to one end of the driving arm; the connection between the pressing arm and the driving arm is hinged to the outer peripheral wall of the first outer cylinder by a hinge pin; An opening is provided on the outer peripheral wall of the first outer cylinder. The other end of the drive arm passes through the opening, extends into the interior of the first outer cylinder, and is connected to the sleeve through a sliding groove mechanism to drive the sleeve to slide axially. Furthermore, the groove mechanism includes a U-shaped opening at one end of the drive arm that extends into the interior of the first outer cylinder, and grooves on opposite sides of the sleeve in the circumferential direction. The two ends of the U-shaped opening are provided with protrusions, which are slidably installed in the groove.

[0016] Furthermore, the driven cylinder includes a large-diameter section and a small-diameter section distributed along the axial direction; The sleeve is fitted onto the outer circumferential surface of the driven cylinder, and a brake cone sleeve is provided inside the sleeve. The brake cone sleeve has an inner cone surface that gradually converges from the large diameter section to the small diameter section. The minimum diameter of the inner conical surface is greater than the outer diameter of the smaller diameter section, but less than the outer diameter of the larger diameter section.

[0017] Furthermore, there is an included angle α between the pressing arm and the driving arm, and a reset element is also provided between the pressing arm and the first outer cylinder.

[0018] Furthermore, the elastic telescopic column includes an inner column and an outer column, wherein the inner column is slidably inserted into the outer column, and a pre-tensioning spring for driving the inner column to return to its original position is provided between the inner column and the outer column.

[0019] Furthermore, hooks are also provided on the outer circumferential surface of the second outer cylinder.

[0020] The beneficial effects of this invention are as follows: (1) By setting the starting conditions of the drive motor to require that the torque output head be pressed against the winding shaft and the second outer cylinder be pressed down to eliminate the initial gap, the present invention solves the risk of mechanical sparks generated by the high-speed rotation of the torque output head hitting the metal base of the electrostatic discharge disk in the misaligned state, and improves the operational safety in the environment of aviation kerosene volatile gas.

[0021] (2) By replacing the traditional rigid connection with a magnetic clutch device, under normal load, the active cylinder is driven by the air gap magnetic field to rotate synchronously. When the cable jam causes the load to exceed the set torque, the active and passive cylinders automatically slip off, and the motor runs idle without continuously applying force to the cable, thus avoiding the metal core inside the electrostatic conductor being pulled off and forming a hidden circuit.

[0022] (3) The present invention links the locking action of the ball locking pin with the braking action of the brake cone sleeve on the driven cylinder by the axial movement of the sleeve. When the device is locked to the electrostatic discharge disk, the brake is released and the torque can be output. When the device is unlocked, the brake is activated and the torque is cut off, thus realizing a safe interlock that allows rotation when locked and braking when unlocked.

[0023] (4) The present invention drives the torque output head to rotate the electrostatic discharge disk winding shaft by driving the motor, thereby realizing the automatic winding of the electrostatic discharge wire and solving the problem of low efficiency of manual winding. Attached Figure Description

[0024] Figure 1 This is an isometric schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the second outer cylinder structure of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the second outer cylinder of the present invention; Figure 5 This is a schematic diagram of the first outer cylinder of the present invention without the torque output head assembled; Figure 6This is a schematic diagram of the first outer cylinder of the present invention when the torque output head is assembled; Figure 7 This is a schematic diagram of the overall structure of the inner cylinder of the present invention; Figure 8 This is a schematic diagram of the structure of the second through hole end of the inner cylinder of the present invention; Figure 9 This is a side view of the assembled shift fork mechanism of the present invention; Figure 10 Top view of the fork mechanism assembly of the present invention; Figure 11 This is a schematic cross-sectional view of the sleeve structure with braking cone sleeve of the present invention; In the diagram: 1-First outer cylinder, 11-End cap, 12-Annular wall, 13-Ball bearing hole, 14-Allowing groove, 15-Through hole, 16-Bearing, 17-Hook, 2-Second outer cylinder, 21-Locking ring, 22-Guide groove, 23-Top column, 24-Elastic telescopic column, 241-Inner column, 242-Outer column, 243-Pre-tension spring, 3-Inner cylinder, 31-Guide key, 32-Charging port, 33-Guide ring, 34-Normally open micro switch, 4-Torque output head, 5-Shift fork mechanism, 51-Pressing arm, 52-Hinge pin, 53-Drive arm, 531-U-shaped opening, 6-Reset component, 7-Drive motor, 8-Magnetic coupler, 81-Active cylinder, 82-Driven cylinder, 9-Sleeve, 91-Brake cone sleeve. Detailed Implementation

[0025] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may 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 may be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Before introducing the embodiments of the present invention, in order for those skilled in the art to better and more accurately understand the technical solutions of the present invention, the technical solutions of the present invention are hereby explained in an interpretive manner; In contrast to existing technologies where manual hand-cranking of the electrostatic reel is inefficient, and the direct use of ordinary portable power tools without anti-misoperation interlocks can easily cause high-speed impact sparks, posing a risk of igniting aviation kerosene volatile gases, and the rigid transmission can easily break the electrostatic conductor core when encountering cable jams, causing a hidden circuit, this invention creates a customized and specialized device specifically adapted to the high-risk working environment of aircraft refueling by using press triggering and magnetic coupling flexible transmission.

[0033] The specific logical chain is as follows: First, in terms of startup safety, this invention does not use the conventional single-key triggering method, but instead sets the torque output head 4 pressing against the electrostatic discharge disk winding shaft and pressing down the second outer cylinder 2 as two conditions that must be met simultaneously.

[0034] The motor can only start when the downward pressure action eliminates the initial gap between the top post 23 and the trigger end of the normally open micro switch 34, thus structurally preventing accidental rotation in an misaligned state.

[0035] Secondly, in terms of power transmission, the present invention replaces the rigid coupling with a magnetic coupling 8. Under normal load, the active cylinder 81 drives the driven cylinder 82 to rotate synchronously through the air gap magnetic force. When the cable jam causes the load to exceed the set torque, the active cylinder 81 and the driven cylinder 82 automatically slip off, and the motor idles without continuously applying force to the cable, thus avoiding the breakage of the internal wire core.

[0036] Furthermore, the present invention links the locking state of the device with the braking state of the driven cylinder 82 by the axial movement of the sleeve 9. When the device is not locked to the electrostatic discharge plate, the brake cone sleeve 91 holds the driven cylinder 82 tightly, and the torque output head 4 does not rotate; after locking, the brake cone sleeve 91 is released, and the torque output head 4 can output, which further improves the operational safety.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] Example 1: As Figures 1-4 As shown, this embodiment provides an electric auxiliary device for an aircraft refueling truck's electrostatic discharge tray, including an inner cylinder 3 and an outer cylinder. The inner cylinder 3 includes a cylinder body and two opposite ends that form a seal around the cylinder body. The opposite ends are respectively provided with a first through hole and a second through hole. The cylinder is equipped with a drive motor 7, the output end of the drive motor 7 passes through the first through hole and is connected to a torque output head 4 for driving the electrostatic disk winding shaft to rotate. The cylinder is also equipped with a normally open micro switch 34 that is electrically connected to the drive motor 7, and the trigger end of the normally open micro switch 34 is installed in the second through hole. The outer cylinder includes a second outer cylinder body 2 that is closed at one end, and the second outer cylinder body 2 is slidably sleeved on the end of the inner cylinder 3 that has a second through hole; A top post 23 and an elastic telescopic post 24 are provided between the inner bottom wall of the closed end of the second outer cylinder 2 and the end. The fixed end of the elastic telescopic post 24 is fixed to the inner bottom wall, and the free end abuts against the end. The top post 23 is coaxially arranged with the second through hole, one end is fixed to the inner bottom wall, and there is an initial gap between the other end and the trigger end. The initial gap is less than the maximum compression stroke of the elastic telescopic post 24.

[0039] The working principle of this embodiment is as follows: The operator first aligns the torque output head 4 with and presses it against the winding shaft slot of the electrostatic discharge disk, at which point the front end of the device obtains the first axial force support point.

[0040] Subsequently, the operator holds the second outer cylinder 2 and applies an axial thrust toward the inner cylinder 3. The thrust is transmitted through the inner bottom wall of the closed end of the second outer cylinder 2 to the free end of the elastic telescopic column 24, forcing the elastic telescopic column 24 to undergo compression deformation.

[0041] Since the fixed end of the elastic telescopic column 24 is fixed to the inner bottom wall, the compression causes the second outer cylinder 2 to slide axially relative to the inner cylinder 3. The end of the inner cylinder 3 with the second through hole moves closer to the closed end of the outer cylinder. As this sliding stroke advances, the top column 23 fixed to the inner bottom wall moves synchronously with the second outer cylinder 2. The initial gap between the top column 23 and the trigger end of the normally open micro switch 34 installed in the second through hole gradually decreases.

[0042] When the initial gap is completely eliminated and the end of the top column 23 presses against the trigger end, the normally open micro switch 34 changes from the normally open state to the closed state, connecting the power supply circuit of the drive motor 7, the drive motor 7 starts, the output end of the drive motor 7 rotates, and drives the torque output head 4 to rotate through the transmission connection, thereby driving the electrostatic coil winding shaft to rotate, realizing the automatic winding of the electrostatic wire.

[0043] After winding is completed, the operator removes the axial thrust applied to the second outer cylinder 2. The elastic telescopic column 24 rebounds under its own elastic restoring force, pushing the inner cylinder 3 to reset relative to the second outer cylinder 2. The initial gap between the top column 23 and the trigger end is restored, the normally open micro switch 34 returns to the normally open state, and the drive motor 7 is de-energized and stops rotating.

[0044] The technical effect achieved by this embodiment is as follows: The starting conditions of the drive motor 7 are set such that the torque output head 4 is pressed against the winding shaft and the second outer cylinder 2 is pressed down to eliminate the initial gap.

[0045] This means that when the operator does not align the torque output head 4 with the winding shaft, the second outer cylinder 2 cannot generate an effective sliding stroke relative to the inner cylinder 3 due to the lack of an axial reaction fulcrum at the front end. The initial gap cannot be eliminated, and the motor will not start. This avoids the risk of mechanical sparks generated when the torque output head 4 rotates at high speed and impacts the metal base of the electrostatic discharge plate in an misaligned state.

[0046] At the same time, this power tool also solves the technical problem of the time and labor-intensive nature of manual winding.

[0047] It is understood that, in order to meet the safety requirements of airports, the inner cylinder 3 is usually made of explosion-proof materials and non-sparking special metals, such as aluminum bronze, beryllium bronze or explosion-proof aluminum alloy with anodized surface, or high-strength non-metallic materials with antistatic and flame-retardant properties, such as flame-retardant ABS, antistatic polycarbonate (PC), polytetrafluoroethylene (PTFE) or carbon fiber reinforced composite materials.

[0048] The drive motor 7 is driven by a variety of power supply methods, such as an intrinsically safe rechargeable battery pack built into the inner cylinder 3, such as an explosion-proof lithium battery or a nickel-metal hydride battery, to meet the wireless and portable operation requirements of the device; or, the device is also equipped with an explosion-proof aviation plug on the outside, which is directly connected to the on-board 24V DC power grid or power input interface of the aircraft refueling vehicle through an external static-dissipating cable to achieve power supply and drive.

[0049] In addition, the drive motor 7 is usually a DC brushless motor to eliminate the mechanical electrical sparks generated by carbon brush friction in traditional brushed motors, further improving the safety performance of the device in flammable and explosive environments such as aviation fuel operations. At the same time, considering that the winding shaft of the electrostatic discharge disk requires a large driving torque, the output end of the drive motor 7 also integrates a reduction mechanism. Specifically, the reduction mechanism can be a planetary gear reducer, which is used to convert the high-speed rotation of the motor into low-speed, high-torque output.

[0050] Example 2: In order to achieve better technical results, this example is further improved based on the first example.

[0051] In one embodiment of the present invention, such as Figure 5 , Figure 6 As shown, the outer cylinder also includes a first outer cylinder body 1 with an end cap 11 at one end, and the first outer cylinder body 1 is fixedly sleeved on the end of the inner cylinder 3 where a first through hole is opened. The end cover 11 is provided with a through hole 15 and a bearing 16. The through hole 15 and the bearing 16 are both coaxial with the output end of the drive motor 7. The bearing 16 includes an inner ring and an outer ring, and the outer ring is fixed on the end cover 11. The first outer cylinder 1 is provided with a magnetic coupling 8 coaxial with the output end of the drive motor 7. The magnetic coupling 8 includes a coaxially nested active cylinder 81 and a driven cylinder 82, with an air gap between the active cylinder 81 and the driven cylinder 82. One end of the driving cylinder 81 is fixedly connected to the output end of the drive motor 7, and one end of the driven cylinder 82 passes through the through hole 15 and is fixedly connected to the inner ring of the bearing 16; the torque output head 4 is coaxially fixedly connected to the end of the driven cylinder 82 that passes through the through hole 15.

[0052] This embodiment further defines the specific structure of the power transmission path based on the first embodiment.

[0053] The working principle of this embodiment is as follows: after the drive motor 7 starts, the output end drives the active cylinder 81 to rotate. The active cylinder 81 and the driven cylinder 82 are coaxially nested, and there is an air gap between them, forming a magnetic coupler 8.

[0054] The magnetic coupler 8 is a component that achieves non-contact torque transmission based on permanent magnets or electromagnetic induction principles. Instead, it achieves torque transmission through the action of a magnetic field. In order to ensure adaptability in the aerospace field, the magnetic coupler 8 in this embodiment is made of samarium cobalt magnet (SmCo).

[0055] Under normal winding load, the driving drum 81 drives the driven drum 82 to rotate synchronously through the magnetic field coupling in the air gap. One end of the driven drum 82 is supported by the inner ring of the bearing 16, and the outer ring of the bearing 16 is fixed on the end cover 11. The end of the driven drum 82 that passes through the hole 15 is fixedly connected to the torque output head 4. The torque output head 4 drives the electrostatic discharge disc to rotate around the shaft, thereby realizing the winding operation.

[0056] When the electrostatic cable encounters unexpected jamming during the winding process, such as when the alligator clip is pressed by the aircraft landing gear or tire, the rotational resistance on the winding shaft increases. This resistance is transmitted to the driven cylinder 82 of the magnetic coupler 8 via the torque output head 4.

[0057] When the load torque exceeds the maximum torque that the air gap magnetic field between the driving drum 81 and the driven drum 82 can transmit, a slip occurs between the driven drum 82 and the driving drum 81. The rotational motion output by the drive motor 7 is no longer transmitted to the driven drum 82, and the drive motor 7 is in an idling state. Then, the winding action of the electrostatic conductive wire stops, and the cable no longer bears continuous winding tension. This avoids the internal conductive metal wire core from being pulled apart due to the tension exceeding its own tensile strength, thus solving the technical problem that the cable appears intact but has a hidden open circuit inside. After the jamming factor is eliminated, the magnetic coupler 8 can automatically restore torque transmission, and the winding operation continues.

[0058] The technical advantage of this embodiment is that the non-contact transmission of the magnetic coupler 8 replaces the rigid gear or coupling transmission of traditional power tools, giving the transmission chain an upper limit threshold for torque transmission. Under overload conditions, the air gap between the driving cylinder 81 and the driven cylinder 82 provides a natural slip protection mechanism, preventing the static-dissipating cable from being secretly damaged under abnormal conditions.

[0059] In one embodiment of the present invention, such as Figure 4 , Figure 7 As shown, an axially extending guide groove 22 is provided on the inner wall surface of the second outer cylinder 2, and a guide key 31 matching the shape of the guide groove 22 is provided on the outer wall surface of the cylinder, and the guide key 31 is slidably installed in the guide groove 22.

[0060] In this embodiment, a guide groove 22 and a guide key 31 are added between the second outer cylinder 2 and the inner cylinder 3. When the operator presses down on the second outer cylinder 2 to make it slide along the axial direction of the inner cylinder 3, the sliding of the guide key 31 in the guide groove 22 restricts the two to only undergo axial relative displacement, preventing the second outer cylinder 2 from rotating circumferentially relative to the inner cylinder 3 during the sliding process. This ensures that the top column 23 fixed to the bottom wall of the second outer cylinder 2 always remains coaxially aligned with the second through hole and the trigger end of the normally open micro switch 34 throughout the entire sliding stroke.

[0061] In one embodiment of the present invention, the elastic telescopic column 24 includes an inner column 241 and an outer column 242. The inner column 241 is slidably inserted into the outer column 242. A pre-tensioning spring 243 for driving the inner column 241 to reset is also provided between the inner column 241 and the outer column 242. The pre-tensioning spring 243 provides a reset force as an elastic element, so that the compression and rebound of the elastic telescopic column 24 is smooth.

[0062] In one embodiment of the present invention, a hook 17 is also provided on the outer peripheral surface of the second outer cylinder 2 for hanging the device in a fixed area.

[0063] In one embodiment of the present invention, the drive motor 7 is driven by an energy storage component, and the inner cylinder 3 is provided with a charging port 32 for power supply.

[0064] like Figure 8 As shown, in one embodiment of the invention, in order to enable the top post 23 to enter the second through hole more smoothly to trigger the trigger end of the normally open micro switch 34, a guide ring 33 is also provided around the second through hole.

[0065] Example 3: In order to achieve better technical results, the present invention makes further improvements based on the first and second embodiments; In one embodiment of the present invention, the first outer cylinder 1 is further provided with a ball locking pin coaxial with the driven cylinder 82; The ball locking pin includes an annular wall 12 provided on the end cap 11, and a plurality of ball holes 13 are provided through the annular wall 12, each ball hole 13 containing a ball. It also includes a sleeve 9 disposed inside the first outer cylinder 1 and coaxial with the annular wall 12. The sleeve 9 is provided with a driving device for driving the sleeve 9 to slide axially. The outer wall surface of the sleeve 9 has a pushing section for radially pushing the ball, causing the ball to partially protrude and enter the external mating groove, and a yielding section for releasing the radial pushing of the ball.

[0066] It is understandable that, in order to allow the sleeve 9 to slide smoothly, the end cap 11 is also provided with a clearance groove 14 for avoiding the sleeve 9.

[0067] Based on the first and second embodiments, this embodiment further provides a locking mechanism for fixing the entire device to the electrostatic discharge disk.

[0068] The working principle of this embodiment is as follows: when the ball locking pin is in the unlocked state, the retraction section of the sleeve 9 is aligned radially with each ball hole 13 on the annular wall 12. The retraction section is a cylindrical section or annular groove with a reduced diameter. The ball can be radially retracted into the ball hole 13 and does not protrude from the outer circumferential surface of the annular wall 12. At this time, the device can be axially inserted into or detached from the installation interface of the electrostatic discharge plate.

[0069] When locking is required, the drive device drives the sleeve 9 to slide axially, so that the pushing section of the outer wall of the sleeve 9 moves to a position that is radially aligned with each ball hole 13. The pushing section is a cylindrical section with an increased diameter, and its outer diameter is larger than that of the yielding section. The outer wall of the pushing section pushes the ball radially outward, forcing the ball to move outward along the ball hole 13, so that the local spherical surface of the ball protrudes from the outer circumference of the annular wall 12 and is embedded in the pre-set mating groove on the electrostatic discharge plate, forming an axial limit, and the device is locked on the electrostatic discharge plate.

[0070] When unlocking is required, the drive device drives the sleeve 9 to slide in the opposite axial direction, the retraction section is re-aligned with the ball hole 13, the radial pushing force on the ball is released, the ball can retract into the ball hole 13, and the lock is released.

[0071] It is understood that the driving device includes, but is not limited to, a cam push rod mechanism, a threaded push mechanism, or a linear electromagnetic drive mechanism, which are mechanical or electromechanical components that can convert the operator's manual operation or electrical control signal into the axial linear displacement of the sleeve 9. In this embodiment, the driving device is used to drive the sleeve 9 to slide axially, so that the pushing section and the yielding section of the outer wall of the sleeve 9 are radially aligned with the ball hole 13, thereby realizing the switching between the locked and unlocked states.

[0072] The technical advantage of this embodiment is that the device and the electrostatic discharge disk are quickly fixed and released by using a radial locking method with ball locking pins. The operator only needs to control the axial sliding of the sleeve 9 through the drive device to complete the locking or unlocking action. Compared with traditional fixing methods such as threaded engagement or bolt tightening, it does not rely on tools and multiple rotation operations, thus improving the work efficiency in aircraft refueling operations.

[0073] In one embodiment of the present invention, such as Figure 9 , Figure 10 As shown, the driving device includes a shift fork mechanism 5, which includes a pressing arm 51 and a driving arm 53. One end of the pressing arm 51 is fixedly connected to one end of the driving arm 53; the connection between the pressing arm 51 and the driving arm 53 is hinged to the outer peripheral wall of the first outer cylinder 1 by a hinge pin 52. An opening is provided on the outer peripheral wall of the first outer cylinder 1. The other end of the driving arm 53 passes through the opening, extends into the interior of the first outer cylinder 1, and is connected to the sleeve 9 through a sliding groove mechanism to drive the sleeve 9 to slide axially. This embodiment further specifies one particular implementation of the driving device, which is a shift fork mechanism 5.

[0074] The working principle of this embodiment is as follows: Primarily based on the lever principle, when the operator presses the pressing arm 51, the pressing arm 51 swings around the hinge pin 52 towards the outer peripheral wall of the first outer cylinder 1, and the driving arm 53 simultaneously swings around the hinge pin 52 away from the outer peripheral wall of the first outer cylinder 1. One end of the driving arm 53, which extends into the first outer cylinder 1, transmits the axial component of the swing displacement to the sleeve 9 through a sliding groove mechanism, driving the sleeve 9 to slide axially towards the annular wall 12. When the pushing section of the sleeve 9 slides to the ball hole 13, the outer wall surface of the pushing section radially pushes the ball outward, and the partial spherical surface of the ball protrudes from the outer peripheral surface of the annular wall 12, embedding into the pre-set mating groove on the electrostatic discharge plate to form a lock.

[0075] When the operator pulls up the pressing arm 51, the pressing arm 51 can swing back and reset around the hinge pin 52 under external force or reset action. The driving arm 53 swings back accordingly, and drives the sleeve 9 to slide in the opposite direction through the sliding groove mechanism. The pushing section of the sleeve 9 slides down, the radial pushing force on the ball is released, and the ball can return to the ball hole 13, and the lock is released.

[0076] The technical effect of this embodiment is that, through the lever structure of the shift fork mechanism 5, the force applied by the operator to the pressing arm 51 is transmitted and amplified through the hinge pin 52 fulcrum and then acts on the sleeve 9. The sliding mechanism converts the arc swing of the drive arm 53 into the pure axial linear sliding of the sleeve 9, avoiding radial wear or jamming between the sleeve 9 and the annular wall 12 caused by the radial component of the swing trajectory of the drive arm 53 directly acting on the sleeve 9. Furthermore, since it is a purely mechanical trigger, it further improves the safety in the field of aerospace fuel refueling.

[0077] In one embodiment of the present invention, the groove mechanism includes a U-shaped opening 531 disposed at one end of the drive arm 53 extending into the interior of the first outer cylinder 1, and grooves disposed on opposite sides of the sleeve 9 in the circumferential direction. The U-shaped opening 531 has protrusions at both ends, and the protrusions are slidably installed in the groove.

[0078] This embodiment further defines a specific implementation of the chute mechanism.

[0079] The working principle of this embodiment is as follows: when the operator presses the pressing arm 51 to make the driving arm 53 swing around the hinge pin 52, the U-shaped opening 531 at the end of the driving arm 53 moves together with the driving arm 53, and the movement trajectory is an arc with the hinge pin 52 as the center.

[0080] The circular motion can be decomposed into a displacement component along the axial direction of the first outer cylinder 1 and a displacement component along the radial direction. The protrusions at both ends of the U-shaped opening 531 slide in the grooves on both sides of the sleeve 9. The grooves exert a radial constraint on the protrusions along the sleeve 9. The protrusions can only be displaced along the axial extension direction of the grooves. The radial displacement component in the circular motion is absorbed by the grooves and will not be transmitted to the sleeve 9. Only the axial displacement component is transmitted to the sleeve 9 through the cooperation between the protrusions and the grooves, driving the sleeve 9 to slide along the axial direction.

[0081] When the operator pulls up the pressing arm 51, the drive arm 53 swings in the opposite direction, and the protrusions at both ends of the U-shaped opening 531 slide in the opposite direction in the groove, causing the sleeve 9 to slide and reset in the opposite direction axially.

[0082] The technical effect of this embodiment is that the cooperation between the U-shaped opening 531 and the grooves on both sides of the sleeve 9 in the circumferential direction decomposes the arc swing of the drive arm 53 into axial useful displacement and radial ineffective displacement. The radial ineffective displacement is absorbed by the groove and does not act on the sleeve 9. The sleeve 9 only bears the axial driving force, which ensures the pure linear sliding of the sleeve 9 inside the annular wall 12. It avoids the sleeve 9 from being worn or stuck due to radial force, and improves the accuracy and service life of the sliding mechanism. At the same time, the protrusions at both ends of the U-shaped opening 531 cooperate with the grooves on both sides of the sleeve 9 to make the sleeve 9 bear the force evenly in the circumferential direction, which further improves the stability of sliding.

[0083] In one embodiment of the present invention, the pressing arm 51 and the driving arm 53 have an included angle α, and a reset member 6 is also provided between the pressing arm 51 and the first outer cylinder 1.

[0084] The working principle and technical effects of this embodiment are as follows: The included angle α causes the pressing arm 51 and the driving arm 53 to deflect at the connection point, so that they do not extend on the same straight line. The installed reset piece 6 enables the shift fork mechanism 5 to have an automatic reset function. When the operator presses the pressing arm 51, the reset piece 6 undergoes elastic deformation and stores elastic potential energy. After the operator releases the pressing arm 51, the reset piece 6 releases the elastic potential energy, drives the pressing arm 51 to swing back around the hinge pin 52 to reset, and drives the sleeve 9 to return to the unlocked position.

[0085] The included angle α is generally 100°-150° in the field working environment, forming an obtuse angle structure. The reset component 6 includes, but is not limited to, torsion springs, tension springs, spring sheets or elastic rubber columns, which are elastic elements that can undergo elastic deformation when loaded and return to their original shape after unloading.

[0086] In one embodiment of the present invention, a locking ring 21 is fixedly provided on the second outer cylinder 2 corresponding to the extreme position after the pressing arm 51 is pressed down. The locking ring 21 is usually made of flexible rubber. After the operator fixes the device to the electrostatic discharge plate, he pushes the second outer cylinder 2 and the locking ring 21 is sleeved on the pressing arm 51 to overcome the elastic force of the reset member 6.

[0087] Example 4: In order to achieve better technical results, this example is further improved based on the second and third examples.

[0088] In one embodiment of the present invention, such as Figure 11 As shown, the driven cylinder 82 includes a large-diameter section and a small-diameter section distributed along the axial direction; The sleeve 9 is sleeved on the outer peripheral surface of the driven cylinder 82, and the sleeve 9 is provided with a brake cone sleeve 91 inside. The brake cone sleeve 91 has an inner cone surface that gradually converges from the large diameter section to the small diameter section. The minimum diameter of the inner conical surface is greater than the outer diameter of the small diameter section, but less than the outer diameter of the large diameter section.

[0089] The technical principle of this embodiment is as follows: by linking the axial movement of the sleeve 9 with the braking control of the driven cylinder 82, the fixed state of the device and the start / stop state of the torque output are interlocked.

[0090] Since the sleeve 9 is fitted on the outer circumferential surface of the driven cylinder 82, the brake cone sleeve 91 installed inside moves axially together with the sleeve 9.

[0091] The outer circumference of the driven cylinder 82 is a two-section structure distributed along the axial direction. The side closer to the driving cylinder 81 is the large diameter section, and the side farther away is the small diameter section. The outer diameter of the large diameter section is larger than that of the small diameter section. The inner conical surface of the brake cone sleeve 91 gradually converges from the large diameter section to the small diameter section. That is, the opening diameter of the inner conical surface is larger at the end closer to the large diameter section and smaller at the end closer to the small diameter section.

[0092] The minimum diameter of the inner conical surface is between the outer diameter of the small diameter section and the outer diameter of the large diameter section. This dimensional relationship determines that there is an annular gap between the inner conical surface and the outer circumferential surface of the small diameter section at any axial relative position, and the inner conical surface and the small diameter section do not come into contact. However, when the inner conical surface and the outer circumferential surface of the large diameter section overlap axially, because the minimum diameter of the inner conical surface is smaller than the outer diameter of the large diameter section, the inner conical surface will generate a radial clamping force on the outer circumferential surface of the large diameter section.

[0093] The linkage working process of the ball locking pin in this embodiment, combined with that in Embodiments 2 and 3, is as follows: When the sleeve 9 is driven by the driving device to slide axially in the locking direction and the pushing section pushes the ball to protrude to form a lock, the sleeve 9 drives the brake cone sleeve 91 to move axially synchronously. The inner cone surface of the brake cone sleeve 91 is offset from the large diameter section of the driven cylinder 82 in the axial direction. The inner cone surface is located in the outer peripheral area of ​​the small diameter section. There is an annular gap between the inner cone surface and the small diameter section. The driven cylinder 82 can rotate freely. At this time, the torque transmitted by the drive motor 7 through the magnetic coupler 8 can be normally output to the torque output head 4 through the driven cylinder 82.

[0094] When the sleeve 9 is driven by the drive device to slide axially in the unlocking direction, the sleeve 9 drives the brake cone sleeve 91 to move axially synchronously. The inner cone surface of the brake cone sleeve 91 is axially fitted onto the large diameter section of the driven cylinder 82. A braking contact is formed between the inner cone surface and the outer circumferential surface of the large diameter section. The inner cone surface applies a radial clamping force to the large diameter section. The driven cylinder 82 is constrained by the brake cone sleeve 91 and cannot rotate freely. At this time, even if the drive motor 7 is in a rotating state, the torque cannot be transmitted to the torque output head 4 through the driven cylinder 82.

[0095] The technical advantage of this embodiment is that the locking action of the ball locking pin and the braking action of the driven cylinder 82 are set to the same axial displacement drive of the sleeve 9, so that the brake is released and the torque can be output in the locked state, and the brake is activated and the torque is cut off in the unlocked state. This makes the driven cylinder 82 mechanically constrained by the brake cone sleeve 91 and unable to rotate when the device is detached from the electrostatic discharge plate or in the state of not being locked. This avoids the risk of the torque output head 4 spinning freely and colliding with metal to generate sparks when the operator accidentally touches the start switch when holding the device and the lock is not completed.

[0096] In one embodiment of the present invention, the inner conical surface of the brake cone sleeve 91 has multiple axially extending protruding ridges distributed circumferentially, and the outer circumferential surface of the large-diameter section of the driven cylinder 82 has correspondingly multiple axially extending grooves; or, the inner conical surface of the brake cone sleeve 91 has multiple axially extending grooves distributed circumferentially, and the outer circumferential surface of the large-diameter section of the driven cylinder 82 has correspondingly multiple axially extending protruding ridges. When the brake cone sleeve 91 is axially fitted onto the large-diameter section, the protruding ridges are embedded in the grooves, restricting the rotation of the driven cylinder 82.

[0097] This invention is not limited to the optional embodiments described above, and anyone can derive other various forms of products based on the inspiration of this invention. The specific embodiments described above should not be construed as limiting the scope of protection of this invention; the scope of protection of this invention should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. An electric auxiliary device for an aircraft refueling truck's electrostatic discharge tray, comprising an inner cylinder (3) and an outer cylinder, characterized in that: The inner cylinder (3) includes a cylinder body and two opposite ends that form a closure between the cylinder body, and the opposite ends are respectively provided with a first through hole and a second through hole; The cylinder is equipped with a drive motor (7), the output end of the drive motor (7) passes through the first through hole and is connected to a torque output head (4) for driving the electrostatic disk winding shaft to rotate. The cylinder is also equipped with a normally open micro switch (34) electrically connected to the drive motor (7), and the trigger end of the normally open micro switch (34) is installed in the second through hole. The outer cylinder includes a second outer cylinder body (2) that is closed at one end, and the second outer cylinder body (2) is slidably sleeved on the end of the inner cylinder (3) that has a second through hole; A top post (23) and an elastic telescopic post (24) are provided between the inner bottom wall of the closed end of the second outer cylinder (2) and the end. The fixed end of the elastic telescopic post (24) is fixed to the inner bottom wall, and the free end abuts against the end with the second through hole. The top post (23) is coaxially arranged with the second through hole, one end is fixed to the inner bottom wall, and the other end has an initial gap with the trigger end. The initial gap is less than the maximum compression stroke of the elastic telescopic post (24).

2. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 1, characterized in that: The inner wall of the second outer cylinder (2) is provided with an axially extending guide groove (22), and the outer wall of the cylinder is provided with a guide key (31) that matches the shape of the guide groove (22). The guide key (31) is slidably installed in the guide groove (22).

3. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 1, characterized in that: The outer cylinder also includes a first outer cylinder body (1) with an end cap (11) at one end, and the first outer cylinder body (1) is fixedly sleeved on the end of the inner cylinder (3) where a first through hole is opened; The end cap (11) is provided with a through hole (15) and a bearing (16). The through hole (15) and the bearing (16) are coaxial with the output end of the drive motor (7). The bearing (16) includes an inner ring and an outer ring, and the outer ring is fixed on the end cap (11). The first outer cylinder (1) is provided with a magnetic coupling (8) coaxial with the output end of the drive motor (7). The magnetic coupling (8) includes a coaxially nested active cylinder (81) and a driven cylinder (82), with an air gap between the active cylinder (81) and the driven cylinder (82). One end of the active cylinder (81) is fixedly connected to the output end of the drive motor (7), and one end of the driven cylinder (82) passes through the through hole (15) and is fixedly connected to the inner ring of the bearing (16); the torque output head (4) is coaxially fixedly connected to the end of the driven cylinder (82) that passes through the through hole (15).

4. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 3, characterized in that: The first outer cylinder (1) is also provided with a ball locking pin coaxial with the driven cylinder (82); The ball locking pin includes an annular wall (12) provided on the end cap (11), and a plurality of ball holes (13) are provided through the annular wall (12), and each ball hole (13) contains a ball. It also includes a sleeve (9) disposed inside the first outer cylinder (1) and coaxial with the annular wall (12). The sleeve (9) is provided with a driving device for driving the sleeve (9) to slide axially. The outer wall surface of the sleeve (9) has a pushing section for radially pushing the ball, causing the ball to partially protrude and enter the external mating groove, and a retraction section for releasing the radial pushing of the ball.

5. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 4, characterized in that: The drive device includes a shift fork mechanism (5), which includes a pressing arm (51) and a drive arm (53). One end of the pressing arm (51) is fixedly connected to one end of the driving arm (53); the connection between the pressing arm (51) and the driving arm (53) is hinged to the outer peripheral wall of the first outer cylinder (1) by a hinge pin (52); An opening is provided on the outer peripheral wall of the first outer cylinder (1). The other end of the drive arm (53) passes through the opening and extends into the interior of the first outer cylinder (1). It is connected to the sleeve (9) through a sliding groove mechanism to drive the sleeve (9) to slide axially.

6. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 5, characterized in that: The chute mechanism includes a U-shaped opening (531) at one end of the drive arm (53) that extends into the interior of the first outer cylinder (1), and grooves on opposite sides of the sleeve (9) in the circumferential direction. The U-shaped opening (531) has protrusions at both ends, and the protrusions are slidably installed in the groove.

7. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 4, characterized in that: The driven cylinder (82) includes a large-diameter section and a small-diameter section distributed along the axial direction; The sleeve (9) is sleeved on the outer circumferential surface of the driven cylinder (82), and the inside of the sleeve (9) is provided with a brake cone sleeve (91), which has an inner cone surface that gradually converges from the large diameter section to the small diameter section. The minimum diameter of the inner conical surface is greater than the outer diameter of the small diameter section, but less than the outer diameter of the large diameter section.

8. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 5, characterized in that: The pressing arm (51) and the driving arm (53) have an included angle α, and a reset member (6) is also provided between the pressing arm (51) and the first outer cylinder (1).

9. The electric auxiliary device for the electrostatic discharge tray of the aircraft refueling vehicle according to claim 1, characterized in that: The elastic telescopic column (24) includes an inner column (241) and an outer column (242). The inner column (241) is slidably inserted into the outer column (242). A pre-tensioning spring (243) for driving the inner column (241) to reset is also provided between the inner column (241) and the outer column (242).

10. The electric auxiliary device for the electrostatic discharge tray of an aircraft refueling vehicle according to any one of claims 1-9, characterized in that: The outer circumferential surface of the second outer cylinder (2) is also provided with a hook (17).

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