CN115799914A - Power supply connecting device - Google Patents

Abstract

The present invention relates to a power supply connection device constituted by a plug unit and a socket unit electrically connected to each other. The plug unit comprises a plug body (6) and a plug housing (7, 8) which is movable between an on-position and an off-position and which forms a gap with the plug body having a first and a second distance at the two positions, respectively, the second distance being greater than the first distance. The socket unit is provided with a plug support frame (3) dimensioned to allow the plug support frame (3) to be inserted into or removed from the gap when the plug housing is in the off position, and to create an increased friction force between the plug unit and the socket unit and to clamp the plug support frame (3) in the gap during movement of the plug housing from the off position to the on position. The power connection device of the invention can reliably realize automatic connection and disconnection between the plug unit and the socket unit of the aircraft in an intelligent and safe manner.

Description

Power supply connecting device

Technical Field

The invention relates to a power supply connecting device. More particularly, the present invention relates to a mezzanine-style power connection apparatus for connecting a ground-based mobile power source and an aircraft.

Background

When an aircraft is parked on the ground for ground service work, such as by maintenance personnel, it is often necessary to power the aircraft on a ground-based portable power source, such as a ground-based power cart.

Fig. 1 shows a schematic representation of a ground-based mobile power supply 11 for powering an aircraft 10 via an external power cable 4. It can be seen that the ground-based mobile power supply 11, such as a ground-based power cart, is typically parked near the nose of the aircraft 10, while the external power panel of the aircraft 10 is typically disposed below or laterally below the nose and at a predetermined distance from the ground. In this operating condition, the serviceman needs to connect the external power cable 4 of the ground mobile power supply 11 to the external power panel of the aircraft 10, such as by means of a plug, in order to achieve power supply to the aircraft 10.

To ensure stability of the power connection, maintenance personnel will typically hang the external power cable 4 at or near the aircraft bulkhead using a hook. However, due to various external factors (e.g., maintenance personnel may be too tired due to work, etc.), maintenance personnel may sometimes forget to remove the external power cable 4 from the hook and unplug the external power cable 4 from the external power panel of the aircraft 10 after completing the service work. At this time, once the ground mobile power supply 11 is removed, the external power cable 4 is suddenly pulled off from the external power panel of the aircraft 10, which not only causes the hook to bend and deform, but also causes the external power panel, the external power plug and the surrounding structure to be damaged, thereby causing potential maintenance safety hazards.

In the case where the external power panel of the aircraft 10 is arranged below the aircraft nose, the external power cable 4 will be inserted into the external power panel in a suspended state even if a hook is used. At this time, since the weight of the suspended cable is completely borne by the friction force generated between the plug unit and the socket unit, the connection is easily loosened and the contact is poor, and the stability of the power connection cannot be ensured.

To this end, some solutions have been proposed in the industry for the purpose of solving the above-mentioned drawbacks.

For example, chinese patent CN215299585U, filed 28/6/2021 by sheng yang xinghua aeronautics electrical products, ltd, discloses a ground power interface device. The ground power supply interface device is used for a power supply interface during ground maintenance of an airplane, and comprises a socket, a box body assembly, a control end connector and a box cover, wherein an indicating lamp and a button switch are embedded in the side wall of the box body assembly, a through hole is formed in the side wall of the box body assembly, and the root of the socket is provided with a locking device. The ground power supply interface device ensures firm and reliable butt joint in the use process of a product by equipping the PJ connector interface end with a locking device. However, such locking devices are relatively complex and costly. In addition, although the ground power interface device is provided with an indicator light for indicating the power supply working state, the interface device cannot be automatically powered off, and the possibility that an external power panel, an external power plug and a surrounding structure are damaged when the ground mobile power supply is removed still exists.

A ground power electrical connector is disclosed in chinese patent application CN105206969A, also filed by sheng yang xinghua avionics ltd, 2015 on 10 th. The ground power supply electric connector is applied to a power supply system of an airplane and comprises a plug and a socket. This kind of ground power electrical connector is cut straightly formula, namely: the contact body is connected in a crown spring type, and is locked by a flat nozzle hasp after being butted, so that the contact body can be quickly separated and inserted. However, as is readily understood by those skilled in the art, the contact body using the crown spring type connection has a high requirement for the machining accuracy of the flat nozzle buckle. If there is an error in machining, the fitting cannot be performed, and undesirable situations such as loosening are likely to occur. Therefore, the use cost of such a ground power electrical connector is relatively high.

A connection system for an airborne ground power unit is disclosed in U.S. patent No. 7,484,689b2 filed on 19.7.2002 by Illinois Tool Works. The connection system has a release mechanism, such as a straight pull coupling. The release mechanism is disconnected in response to movement of the aircraft or ground power supply unit and thus acts as a trigger device which does not have a clamping function. Therefore, such a connection system does not actually solve the technical problem that the present application is intended to solve.

Therefore, it is desirable to design an intelligent connection device that can automatically turn on/off the plug unit and the receptacle unit of the aircraft to prevent accidental damage to the peripheral structure of the power supply outside the aircraft into which the plug unit is inserted.

Disclosure of Invention

The object of the present invention is to provide a power connection device for an aircraft which reliably achieves automatic switching on and off between a plug unit and a socket unit in an intelligent, safe manner.

The invention relates to a power connection device for connecting an external power cable of a ground mobile power supply to an external power interface of an aircraft, which power connection device is composed of a plug unit and a socket unit which are electrically connected to one another, wherein the plug unit is attached to an insertion end of the external power cable and comprises a plug body and a plug housing which encloses the plug body at least partially therein, the plug housing being movable between a conducting position and a disconnecting position, wherein, when the plug housing is in the conducting position, a gap having a first distance is formed between the plug housing and the plug body, and, when the plug housing is in the disconnecting position, a gap having a second distance is formed between the plug housing and the plug body, wherein the second distance is greater than the first distance, and the socket unit is provided with a plug support frame which is formed on the external power interface and which is dimensioned such that it is possible for the plug support frame to be inserted into or removed from the gap when the plug housing is in the disconnecting position, and, during a movement of the plug housing from the disconnecting position into the conducting position, an increased friction force is formed between the plug unit and the socket unit and the plug support frame is clamped in the gap.

In the above-described technical solutions, the terms "connect" and "attach" include both directly joining two components together and also joining the two components together at intervals via additional fittings.

The terms "on position" and "off position" refer to the position in which the plug housing is located. When the plug shell moves to the conducting position and the vicinity, the plug unit and the socket unit of the power supply connecting device are electrically conducted, and the power provided by the ground mobile power supply is supplied to the external power interface of the aircraft; when the plug housing is in the disconnected position, the plug unit and the socket unit of the power connection device are in an electrically disconnected state, and the power supplied by the ground mobile power supply is no longer supplied to the external power interface of the aircraft.

The term "increased friction" indicates that the plug support frame is in an interference fit in the gap between the plug housing and the plug body when the plug housing is in the on position. At this time, the plug support frame is clamped in the gap between the plug housing and the plug body, and thus a greater frictional force is generated than before, thereby ensuring that the plug support frame does not come off from the gap between the plug housing and the plug body.

With the above-described technical solution, during the movement of the plug housing from the off position to the on position, the plug support frame, which has been inserted into the gap between the plug housing and the plug body, generates a greater frictional force due to the gradual reduction of the gap. When the plug shell is in the conducting position, the friction force reaches the maximum value, and therefore the external power cable does not need to be hung on the aircraft bulkhead through the external hook, and the potential safety hazards that the external power cable is accidentally torn off from an external power panel of the aircraft or is wound on the hook to cause the hook to bend and deform and the like are avoided.

In a preferred embodiment, the plug housing can be formed at least by a first plug housing half and a second plug housing half, which each enclose at least a part of the plug body, the plug unit being further equipped with a drive device for driving the first plug housing half and the second plug housing half between the on-position and the off-position.

The term "plug housing halves" means that the plug housing is not integrally formed, but rather is formed by at least two, or even three or more plug sub-housings being joined together. In addition, the plug housing does not have to be configured to completely enclose the plug main body, and at least a part of the plug support frame may be inserted into a gap between the plug housing and the plug main body to increase a frictional force therebetween.

By means of the above-described solution, it is possible to adjust the degree of insertion of the plug support frame into the gap between the plug housing and the plug body by designing the shape of each plug sub-housing, for example fully enclosing, half enclosing, or only enclosing three of the four faces of the plug body, etc., in order to further adjust the amount of friction between the plug unit and the socket unit.

In another preferred embodiment, the plug unit may be constituted by a plug front section and a plug rear section, the plug housing and the plug body constituting the plug front section, the driving means being provided in the plug rear section, the plug rear section being attached to the insertion end of the external power cable.

The terms "front plug section" and "rear plug section" cover both front plug sections and rear plug sections having the same size and front plug sections and rear plug sections having different sizes. In the former case, the front plug section and the rear plug section are actually constructed in one piece, and are usually distinguished by features such as ribs formed at the interface therebetween. In the latter case, the front plug-in section and the rear plug section have a stepped shape.

In the above embodiment, it is preferable that at least a part of the front plug section is nested inside the rear plug section, and the plug housing is movable radially and/or axially relative to the rear plug section.

The term "axial" refers to the length direction of the plug unit, while the term "radial" refers to a direction extending over the cross-section of the plug unit, which is perpendicular to the length direction of the plug unit.

By means of the technical scheme, at least one part of the front plug section can be nested in the rear plug section, and the plug shell can move axially relative to the rear plug section, so that the outer power cable can play a role in buffering to overcome partial or all friction force between the plug unit and the socket unit when being violently pulled by external force.

In a further preferred embodiment, the plug rear section may also be provided with a control rail guiding the movement of the plug housing between the on position and the off position.

By means of the technical scheme, the plug shell can axially move relative to the rear section of the plug, and can also move in a reciprocating radial mode between the conducting position and the disconnecting position by means of the control guide rail, so that the operation flexibility of the power supply connecting device is improved, and the operation faults of the power supply connecting device are reduced.

In the above embodiment, the thickness of the plug support frame is set so that the plug support frame is in an interference fit state in the gap when the plug housing is in the conduction position.

In other words, in the above interference fit state, the thickness of the plug support frame is slightly larger than the first distance. The term "slightly" indicates that the value of a variable exceeds the reference value, but the exceeding is extremely small, usually in the range of 0 to 5%.

In a preferred embodiment, at least a portion of the inner wall surface of the plug housing and/or at least a portion of the outer frame surface of the plug support frame may be formed with a frosted surface.

The term "sanding surface" should not be understood simply as a surface coated with a sanded layer. Any material that contributes to the increase in friction may be considered as an equivalent alternative to the sanded layer.

By means of the above technical solution, the frictional force between the plug unit and the receptacle unit can be effectively increased at a lower cost.

In another preferred alternative embodiment of the present invention, the power connecting device further comprises a distance measuring mechanism for detecting a distance from the ground mobile power source to the external power interface, and the driving device drives the plug housing to move from the on position to the off position once the distance detected by the distance measuring mechanism exceeds a prescribed safety distance.

The term "prescribed safe distance" needs to be determined according to actual conditions. For example, if the ground mobile power source is 3m from the aircraft and the length of the cable between the ground mobile power source and the aircraft when the power is turned on is 6m, the safety distance may be set to 4.5m.

Preferably, the distance measuring mechanism may be an infrared distance measuring device having one of a signal emitting element and a signal receiving element mounted on the ground mobile power supply and the other mounted on the plug housing or the insertion end of an external power cable attached to the plug housing.

By means of the technical scheme, the distance between the ground mobile power supply and the aircraft can be monitored at any time by introducing the active distance measuring device, and once the ground mobile power supply moves beyond the safe distance, the driving device drives the plug shell to move from the conducting position to the disconnecting position, so that the damage to the peripheral structure of the power supply outside the aircraft is avoided.

In the above embodiment, the ground power supply may be a ground power supply vehicle.

In the above embodiment, a button for controlling on and off between the plug unit and the outlet unit may be provided.

By means of the technical scheme, the push button can realize the plug plugging operation through manual operation. Because the functions of the infrared distance measuring device are basically similar to those of the infrared distance measuring device, the infrared distance measuring device and the infrared distance measuring device can be used as alternative operation components of each other, so that when one of the two is in failure, the plug can be plugged and unplugged through the other one of the two.

In summary, the power connection device according to the present invention can obtain the following advantages:

the sandwich type power supply connecting device designed by the invention bears the gravity of a plug, a cable and the like by increasing the friction force between the supporting guide rail and the sandwich layer, so as to ensure the reliable connection of the cable and the stability of power supply connection. Therefore, when maintenance personnel maintain the aircraft, the external power cable does not need to be hung on the aircraft bulkhead by means of the external hook, and the risk that the structure and the external power parts are damaged due to the fact that people forget to remove the external power plug from the hook due to factors and the like is avoided.

Drawings

To further illustrate the technical effects of the power supply connection device according to the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, in which:

fig. 1 schematically illustrates an operating situation in which a ground mobile power supply supplies power to an aircraft via an external power cable;

fig. 2 is a perspective view of a mezzanine power connection device according to the invention, in which a plug unit is to be plugged into a socket unit;

FIG. 3 is a perspective view of the plug unit of the power connection device shown in FIG. 2 with the plug housing in a conducting position; and

fig. 4 is a perspective view of the plug unit of the power connection device shown in fig. 2, with the plug housing in the open position.

Reference numerals

1. External power interface

2. Front plug

3. Plug supporting frame

4. External power cable

5. Rear end of plug

6. Plug body

7. First plug housing half

8. Second plug housing half

9. Control guide rail

10. Aircraft with a flight control device

11. Ground mobile power supply

12. Push button

Direction of insertion of F plug

Detailed Description

The configuration of the power supply connection device according to the present invention and its technical effects will be described below with reference to the accompanying drawings.

It should be understood that the embodiments described herein cover only a portion of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments described in the description, are within the scope of protection of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having," and any variations thereof, in the description and claims of the present invention and the description of the above figures are intended to cover non-exclusive inclusions. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It is to be understood that, in the description of the present invention, the terms "inside", "outside", "front", "rear", "upstream" and "downstream" and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Similarly, the terms "first," "second," and the like, are used solely to distinguish one element from another, and do not denote a sequential number of elements in a particular space or position. In other words, if the "first" and "second" are interchanged, there is no substantial effect on the above components.

Fig. 2 is a schematic perspective view of a mezzanine-type power connection device according to the present invention, and fig. 3 and 4 are schematic views of a plug housing of the power connection device shown in fig. 2 in an on position and an off position, respectively.

As shown in fig. 2, the power supply connection device according to the present invention is constituted by a plug unit and a socket unit electrically connected to each other, wherein the plug unit is attached to the insertion end of the external power cable 4 of the mobile power supply device 11 in the plug insertion direction F, and the socket unit is integrated on the external power interface 1 of the aircraft 10. In this example, the portable power supply device 11 is a ground power supply vehicle. However, it will be readily appreciated by those skilled in the art that other portable power supply units may be used in place of the ground power vehicle, and such modifications are intended to fall within the scope of the present invention.

As can be clearly seen in fig. 3, the plug unit comprises a plug body 6 and a plug housing enclosing the plug body 6 at least partially therein. The plug body 6 is provided with a plurality of, in this embodiment, six insertion holes, and the positions and the shapes and the sizes thereof can be changed at will as long as the positions and the shapes and the sizes correspond to those of the pins in the socket unit.

In the present embodiment, the plug housing is composed of a first plug housing half 7 and a second plug housing half 8, the first plug housing half 7 and the second plug housing half 8 each presenting a shape of v 12467so as to completely enclose the plug body 6 therein.

However, the number and shape of the plug housing halves may be varied by one of ordinary skill in the art. For example, the plug housing can be formed by four plug housing corners, each of which is in the form of a L so that the plug body 6 is completely enclosed therein. Alternatively, the plug housing may also partially surround the plug body 6, for example, the plug housing surrounds only three of the four sides of the plug body 6, so that the last side of the plug body 6 is exposed to the outside. Such variations are to be considered within the scope of the invention.

The plug unit is further equipped with a drive means for driving the first plug housing half 7 and the second plug housing half 8 between the on-position and the off-position. The drive means may be a linear motor or any mechanism capable of driving the movement of the first plug housing half 7 and the second plug housing half 8. When the first and second plug housing halves 7, 8 are in the conducting position (see fig. 3), a gap with a first distance is formed between the first and second plug housing halves 7, 8 and the plug body 6. As the first and second plug housing halves 7, 8 move radially from the on position toward the off position, the gaps between the first and second plug housing halves 7, 8 and the plug body 6 gradually increase. When the first and second plug housing halves 7, 8 reach the disconnected position (see fig. 4), a gap with a second distance is formed between the first and second plug housing halves 7, 8 and the plug body 6.

Returning to fig. 2, the outlet unit is provided with a plug support frame 3 formed on the external power interface 1, the plug support frame 3 being dimensioned to allow the plug support frame 3 to be inserted into the gap in an axial direction (i.e. the plug insertion direction F) or to be disengaged from the gap in a direction opposite to the plug insertion direction F when the first plug housing half 7 and the second plug housing half 8 are in the off position, and to clamp the plug support frame 3 when the first plug housing half 7 and the second plug housing half 8 are in the on position, so as to create an increased friction between the plug unit and the outlet unit.

Specifically, during the movement of the first and second plug housing halves 7, 8 from the off position to the on position, the plug support frame 3 is in an interference fit state in the gaps between the first and second plug housing halves 7, 8 and the plug body 6. At this time, the outer side surface of the plug body 6 is in contact with the inner side surface of the plug support frame 3, and the inner side surfaces of the first plug housing half 7 and the second plug housing half 8 are in contact with the outer side surface of the plug support frame 3, so that an increased frictional force is generated between these surfaces to ensure that the plug support frame 3 can fit the gap, and also to maintain this frictional force after insertion to avoid the plug body 6 from coming off the plug support frame 3.

As the first and second plug housing halves 7, 8 move radially from the on position towards the off position, the clearance between the first and second plug housing halves 7, 8 and the plug body 6 gradually increases and the friction between the surfaces gradually decreases. When the first and second plug housing halves 7, 8 reach the disconnected position, the frictional force is substantially eliminated, the plug support frame 3 is disengaged from the gap between the first and second plug housing halves 7, 8 and the plug body 6, and the electrical connection between the plug unit and the socket unit is disconnected.

As shown in fig. 2, the plug unit is formed by a plug front section 2 and a plug rear section 5, wherein the plug body 6, the first plug housing half 7 and the second plug housing half 8 form the plug front section 2, and wherein the drive means are provided in the plug rear section 5, and wherein the plug rear section 5 is attached to the insertion end of the external power cable 4. The cross-sectional dimension of the plug rear section 5 is slightly larger than the cross-sectional dimension of the plug front section 2, so that at least a part of the plug front section 2 is nested inside the plug rear section 5, so that the first plug housing half 7 and the second plug housing half 8 can move in the axial direction (i.e., plug insertion direction F) relative to the plug rear section 5. In this way, since at least a part of the front plug section 2 is nested in the rear plug section 5, when the external power cable 4 is suddenly pulled by an external force, a buffer function can be achieved to overcome part or all of the friction force between the plug unit and the socket unit.

The plug rear section 5 is provided with a control rail 9 which guides the axial displacement of the first plug housing half 7 and the second plug housing half 8 between the on position and the off position. When the cross section of the first and second plug housing halves 7, 8 is substantially rectangular, the control rail 9 may be provided at least one of the four corners of the cross section of the first and second plug housing halves 7, 8. When the first and second plug housing halves 7, 8 are substantially circular in cross-section, the control rails 9 may be evenly distributed around their circumference.

It can be seen that the plug housing can be moved both in the radial direction and in the axial direction relative to the plug rear section 5 and also in the radial direction and in the axial direction relative to the plug rear section 5. It should be noted that the first plug housing half 7 and the second plug housing half 8 constituting the plug housing are axially movable relative to the plug rear section 5, but the plug body 6 enclosed inside the plug housing is fixed relative to the plug rear section 5.

The plug rear section 5 is also provided with a button 12 which can manually control the connection and disconnection between the plug unit and the socket unit, so that the plug can be plugged and unplugged through manual operation. A frosted surface may be formed on at least a part of the inner wall surface of the first and second plug housing halves 7 and 8 and/or at least a part of the outer frame surface of the plug support frame 3. In particular, one or all of the outer sides of the plug body 6, the inner sides of the plug support frame 3 and the inner sides of the first and second plug housing halves 7, 8, the outer sides of the plug support frame 3 may be coated with a frosting or other material that contributes to the increase in friction. In this way, the frictional force between the plug unit and the receptacle unit can be effectively increased at a lower cost.

The power connection device further comprises a distance measuring mechanism for detecting the distance between the ground mobile power supply 11 and the external power interface 1, and the driving device drives the first plug housing half 7 and the second plug housing half 8 to move from the on position to the off position once the distance detected by the distance measuring mechanism exceeds a specified safety distance.

In one example, if ground mobile power source 11 is 3m from aircraft 10 and the length of the cable between ground mobile power source 11 and aircraft 10 when powered on is 6m, the safe distance may be set to 4.5m.

The distance measuring mechanism typically employs an infrared distance measuring device, one of which is mounted on the ground mobile power supply 11 and the other is mounted on the first and second plug housing halves 7, 8 or the insertion end of the external power cable 4 attached to the first and second plug housing halves 7, 8. Of course, the mounting positions of the signal transmitting element and the signal receiving element may be interchanged.

The infrared distance measuring device is an active distance measuring device which can monitor the distance between the ground mobile power supply 11 and the aircraft 10 at any time and, as soon as it is found that the ground mobile power supply 11 has moved beyond its safe distance, send a signal instructing the actuation device to operate to actuate the first plug housing half 7 and the second plug housing half 8 from the on position to the off position.

It is also possible for the person skilled in the art to design the power connection device to continue to move up to the completely disengaged position after driving the first plug housing half 7 and the second plug housing half 8 from the on position to the off position. During the movement from the disconnected position to the fully disengaged position, the gap between the first and second plug housing halves 7, 8 and the plug body 6 continues to increase to ensure that the plug unit of the power connection device can be fully disengaged from the receptacle unit. It will be readily appreciated by those of ordinary skill in the art that such modifications are intended to fall within the scope of the present invention.

With the sandwich-type power connection device as described above, it is possible to increase the frictional force between the plug unit and the socket unit of the aircraft 10 when they are held to each other, to ensure reliable connection of the cables and to ensure stability of the power connection. Therefore, when maintenance personnel maintain the aircraft, the external power cable does not need to be hung on the aircraft bulkhead by means of the external hook, and the risk that the structure and the external power parts are damaged due to the fact that people forget to remove the external power plug from the hook due to factors and the like is avoided.

Although the structure and operation of the power supply connection device according to the present invention have been described in conjunction with the preferred embodiments and the accompanying drawings, it will be understood by those skilled in the art that the above examples are illustrative only and are not to be construed as limiting the present invention. Thus, the present invention can be modified and varied within the true spirit and scope of the claims, and all such modifications and variations are intended to fall within the scope of the claims.

Claims (11)

1. A power supply connection device for connecting an external power cable (4) of a ground mobile power supply (11) to an external power interface (1) of an aircraft (10), the power supply connection device being constituted by a plug unit and a socket unit which are electrically connected to each other,

attached to the insertion end of the external power cable (4) and comprising a plug body (6) and a plug housing (7, 8) enclosing the plug body (6) at least partially therein, the plug housing (7, 8) being movable between an on-position and an off-position, wherein, when the plug housing (7, 8) is in the on-position, a gap having a first distance is formed between the plug housing (7, 8) and the plug body (6), and, when the plug housing (7, 8) is in the off-position,

a gap with a second distance is formed between the plug housing (7, 8) and the plug body (6),

wherein the second distance is greater than the first distance, and

the socket unit is provided with a plug support frame (3) formed on the external power interface (1), the plug support frame (3) being dimensioned to allow the plug support frame (3) to be inserted into or removed from the gap when the plug housing (7, 8) is in the off position, and to create an increased friction between the plug unit and the socket unit and to clamp the plug support frame (3) in the gap during movement of the plug housing (7, 8) from the off position to the on position.

2. The power connection device according to claim 1, characterized in that the plug housing (7, 8) is composed of at least a first plug housing half (7) and a second plug housing half (8), the first plug housing half (7) and the second plug housing half (8) each enclosing at least a part of the plug body (6), the plug unit being further equipped with drive means for driving the first plug housing half (7) and the second plug housing half (8) to move between the on-position and the off-position.

3. The power connection device according to claim 2, wherein the plug unit is composed of a front plug section (2) and a rear plug section (5), the plug housings (7, 8) and the plug body (6)

Constituting the front plug section (2), the drive means being provided in the rear plug section (5), the rear plug section (5) being attached to the insertion end of the external power cable (4).

4. The power connection device according to claim 3, characterized in that at least a part of the front plug section (2) is nested inside the rear plug section (5) and the plug housing (7, 8) is movable radially and/or axially relative to the rear plug section (5).

5. Power connection device according to claim 4, characterized in that the plug rear section (5) is further provided with a control rail (9) guiding the plug housing (7, 8) between the on-position and the off-position.

6. The power supply connection device according to any one of claims 1 to 5, wherein the thickness of the plug support frame (3) is set such that the plug support frame (3) is in an interference fit state in the gap when the plug housing (7, 8) is in the on position.

7. The power supply connection device according to any one of claims 1 to 5, wherein at least a part of an inner wall surface of the plug housing (7, 8) and/or at least a part of an outer frame surface of the plug support frame (3) is formed with a frosted surface.

8. The power connection device according to any one of claims 1 to 5, further comprising a distance measuring mechanism for detecting a distance between the ground mobile power supply (11) and the external power interface (1), wherein the driving device drives the plug housing (7, 8) to move from the on position to the off position once the distance detected by the distance measuring mechanism exceeds a prescribed safety distance.

9. The power supply connection device according to claim 8, wherein the distance measuring mechanism is an infrared distance measuring device, one of a signal transmitting element and a signal receiving element of which is mounted on the ground mobile power supply (11), and the other is mounted on the plug housing (7, 8) or the insertion end of the external power cable (4) attached to the plug housing (7, 8).

10. The power connection device according to any one of claims 1 to 5, wherein the ground mobile power source (11) is a ground power car.

11. A power connection device according to any one of claims 1 to 5, characterised in that there is provided a button (12) for manual control of the connection and disconnection between the plug unit and the socket unit.

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