CN221080949U - Charging station - Google Patents

Abstract

The utility model discloses a charging station, and belongs to the technical field of charging stations. The charging station comprises a base station protective shell; the mounting box is arranged in the base station protective shell and comprises a fixing plate, a first supporting leg and a second supporting leg which are integrally formed, the control circuit board is arranged in a limiting groove of the fixing plate, the first supporting leg extends along a first direction relative to the fixing plate, the second supporting leg extends along a second direction relative to the fixing plate, and the direction of the first direction is opposite to that of the second direction; one end of the first binding post is arranged on the first supporting leg and is electrically connected with the control circuit board, and the other end of the first binding post extends out of the base station protecting shell; and one end of the second binding post is arranged on the second supporting leg and is electrically connected with the control circuit board, the other end of the second binding post extends out of the base station protecting shell, and two ends of the boundary signal wire are respectively connected with the first binding post and the second binding post. The utility model not only assists the robot to safely operate, but also ensures the correct wiring of the boundary signal line.

Description

Charging station

Technical Field

The utility model relates to the technical field of charging stations, in particular to a charging station.

Background

With the continuous progress of science and technology, various automatic working devices have begun to slowly walk into people's lives, for example: an automatic dust collection robot, an automatic mowing robot and the like. The automatic working equipment is provided with a walking device, a working device and an automatic control device, so that the automatic working equipment can be separated from the operation of people, and can walk and work automatically in a certain range. When the energy storage device of the automatic working equipment is insufficient in energy, the automatic working equipment can automatically return to the charging station device for charging, and then work is continued.

However, the existing robot has the following problems in the process of operation:

1. because the operation area is irregular, some robots easily walk out of the operation area, and operation risks exist;

2. When the operation robot approaches the charging station, the walking speed is not easy to control, and the robot is easy to collide with the charging base station;

3. The binding post of the existing boundary signal line is positioned on the same side of the charging base station, and error wiring is easy to cause.

For this reason, it is desirable to provide a charging station to solve the above problems.

Disclosure of utility model

The utility model aims to provide a charging station which not only assists a robot to safely operate, but also ensures the correct wiring of boundary signal wires.

In order to achieve the above object, the following technical scheme is provided:

A charging station, comprising:

A base station protective shell;

The mounting box is arranged in the base station protecting shell and comprises a fixing plate, a first supporting leg and a second supporting leg which are integrally formed, the control circuit board is mounted in a limiting groove of the fixing plate, the first supporting leg extends along a first direction relative to the fixing plate, the second supporting leg extends along a second direction relative to the fixing plate, and the direction of the first direction is opposite to that of the second direction;

One end of the first binding post is arranged on the first supporting leg and is electrically connected with the control circuit board, and the other end of the first binding post extends out of the base station protecting shell;

And one end of the second binding post is arranged on the second supporting leg and is electrically connected with the control circuit board, the other end of the second binding post extends out of the base station protecting shell, and two ends of the boundary signal wire are respectively connected with the first binding post and the second binding post.

As an alternative of the charging station, the base station protection shell comprises a first shell and a second shell, the first shell is buckled with the second shell from top to bottom to form a containing cavity for containing the installation box, the top wall of the first shell is stopped at the top wall of the second shell, and the peripheral side wall of the first shell is stopped at the base of the second shell.

As an alternative scheme of the charging station, first connecting holes are formed in two opposite side walls of the fixing plate, second connecting holes are formed in the peripheral side walls of the second shell, and a first fastener penetrates through the first connecting holes to be connected with the second connecting holes.

As an alternative scheme of the charging station, the peripheral side wall of the first shell is provided with a first limiting hole, the peripheral side wall of the second shell is outwards protruded with a first limiting protrusion, and the first limiting protrusion is inserted into the first limiting hole.

As an alternative scheme of the charging station, a notch is formed in the bottom of the peripheral side wall of the first shell, a third limiting step is arranged at one end, away from the fixed plate, of the first support leg, and the notch is in butt joint with the third limiting step.

As the alternative scheme of charging station, the protruding second spacing arch that is equipped with in bottom of the week lateral wall of first casing, the base of second casing is equipped with the spacing hole of second, the spacing arch of second is inserted and is located in the spacing hole of second.

As the alternative scheme of charging station, still include the mark board, the mark board is provided with outer convex part, the roof of first casing is concave to be equipped with the slot, outer convex part with the slot grafting.

As an alternative scheme of the charging station, a clamping hook is arranged at the bottom of the slot in a protruding mode, a locking hole is formed in the outer protruding portion, and the clamping hook is clamped with the locking hole.

As an alternative scheme of the charging station, a first water outlet is formed in the bottom of the slot, a water accumulation groove is concavely formed in the top wall of the second shell, a second water outlet is formed in the side wall of the water accumulation groove, and water accumulation can be discharged from the second water outlet after sequentially passing through the first water outlet and the water accumulation groove.

As an alternative of the charging station, the charging device further comprises a charging assembly, the charging assembly is arranged on the peripheral side wall of the second shell, and a third water outlet is formed in a connecting frame of the charging assembly.

Compared with the prior art, the utility model has the beneficial effects that:

According to the charging station provided by the utility model, the mounting box provided with the control circuit board is arranged in the base station protective shell, wherein the first binding post is arranged on the first supporting leg of the control box, which extends along the first direction, the second binding post is arranged on the second supporting leg of the control box, which extends along the second direction, and the two ends of the actually used boundary signal line are connected with the first binding post and the second binding post, so that the control circuit board sends out pulse signals through the boundary signal line, the operation area of a robot can be limited, the robot can be guided to avoid the charging station, and collision is avoided. Because the first binding post and the second binding post are positioned on different sides of the base station protective shell, the base station protective shell is easy to distinguish and identify, and error wiring at two ends of the boundary signal line is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is an assembly schematic diagram of a charging station at a first viewing angle (boundary signal lines are not shown) according to an embodiment of the present utility model;

Fig. 2 is an assembly schematic diagram of a charging station at a second viewing angle (boundary signal lines are not shown) according to an embodiment of the present utility model;

Fig. 3 is an exploded view of a charging station (boundary signal lines are not shown) according to an embodiment of the present utility model;

FIG. 4 is an exploded view of the mounting box, first post and second post of an embodiment of the present utility model;

FIG. 5 is a schematic view of the structure of the mounting box according to the embodiment of the utility model;

FIG. 6 is a schematic view of a first housing according to an embodiment of the utility model;

FIG. 7 is a schematic view of a second view of the first housing according to an embodiment of the utility model;

FIG. 8 is a schematic view of a third view of the first housing according to an embodiment of the present utility model;

FIG. 9 is a schematic view of a first view of a second housing according to an embodiment of the present utility model;

FIG. 10 is a schematic view of a second housing according to an embodiment of the present utility model;

FIG. 11 is an assembly view of a first housing and a second housing according to an embodiment of the present utility model;

FIG. 12 is a schematic view of the structure of a label plate according to an embodiment of the present utility model;

FIG. 13 is a schematic view of an alternative cover in accordance with an embodiment of the present utility model;

FIG. 14 is a schematic diagram of a charging assembly according to an embodiment of the present utility model;

FIG. 15 is an exploded view of a charging assembly according to an embodiment of the present utility model;

fig. 16 is an assembly diagram of a charging pole piece and an elastic member in an embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In order to assist the robot in safe operation and ensure correct wiring of the boundary signal lines, the present embodiment provides a charging station for assisting operation, and the details of the present embodiment are described in detail below with reference to fig. 1 to 16.

As shown in fig. 1 to 5, the charging station for auxiliary operations includes a base station protection case 1, a mounting box 2, a first terminal 3, and a second terminal 4. Wherein, mounting box 2 sets up in basic station protecting crust 1, and mounting box 2 includes integrated into one piece's fixed plate 21, first stabilizer blade 22 and second stabilizer blade 23, and control circuit board 10 installs in the spacing groove 24 of fixed plate 21, and first stabilizer blade 22 extends along first direction relative to fixed plate 21, and second stabilizer blade 23 extends along the second direction relative to fixed plate 21, and the direction of first direction is opposite with the direction of second direction. One end of the first binding post 3 is arranged on the first support leg 22 and is electrically connected with the control circuit board 10, and the other end of the first binding post 3 extends out of the base station protecting shell 1. One end of the second wiring terminal 4 is arranged on the second supporting leg 23 and is electrically connected with the control circuit board 10, the other end of the second wiring terminal 4 extends out of the base station protecting shell 1, and two ends of the boundary signal wire are respectively connected with the first wiring terminal 3 and the second wiring terminal 4.

In short, according to the charging station for auxiliary operation provided by the utility model, the mounting box 2 provided with the control circuit board 10 is arranged in the base station protective shell 1, wherein the first binding post 3 is mounted on the first supporting leg 22 extending along the first direction of the control box, the second binding post 4 is mounted on the second supporting leg 23 extending along the second direction of the control box, two ends of the actually used boundary signal line are connected with the first binding post 3 and the second binding post 4, and the control circuit board 10 sends pulse signals through the boundary signal line, so that the operation area of a robot can be limited, the robot can be guided to avoid the charging station, and collision is avoided. Because the first binding post 3 and the second binding post 4 are positioned on different sides of the base station protective shell 1, the base station protective shell is easy to distinguish and identify, and error wiring at two ends of a boundary signal line is avoided.

Further, as shown in fig. 6 to 11, the base station protection casing 1 includes a first casing 11 and a second casing 12, the first casing 11 is buckled with the second casing 12 from top to bottom and forms a receiving cavity for receiving the mounting box 2, a top wall of the first casing 11 is stopped at a top wall of the second casing 12, and a peripheral side wall of the first casing 11 is stopped at a base of the second casing 12. Specifically, the top wall of the first casing 11 is provided with a via hole 117, the top wall of the second casing 12 is provided with a sleeve 126, after the first casing 11 is spliced with the second casing 12, the sleeve 126 passes through and extends out of the via hole 117, the antenna fixing rod 8 passes through the sleeve 126 and the through hole 129 of the base of the second casing 12 from top to bottom and then is connected with the guide base 7, and the bottom surface of the guide base 7 is in contact with the ground. The top of the antenna fixing pole 8 may be provided with a communication device. Wherein the fixed connection of the second housing 12 to the guide base 7 is achieved by screws through the third connection hole 128 of the second housing 12 and the fourth connection hole 71 of the guide base 7.

Further, the opposite side walls of the fixing plate 21 are provided with first coupling holes 211, the circumferential side wall of the second housing 12 is provided with second coupling holes 121, and the first fasteners pass through the first coupling holes 211 to be coupled with the second coupling holes 121. Illustratively, the first fastener is a screw, and the screw passes through the first connecting hole 211 and then is in threaded connection with the second connecting hole 121, so as to ensure the connection stability of the mounting box 2 and the base station protecting shell 1.

Further, a first limiting hole 114 is formed in the peripheral side wall of the first housing 11, a first limiting protrusion 124 is formed on the peripheral side wall of the second housing 12 in a protruding manner, and the first limiting protrusion 124 is inserted into the first limiting hole 114. Illustratively, the first housing 11 and the second housing 12 are plastic members, the second housing 12 is provided with a spring, and the first limiting protrusion 124 is disposed on the spring, so as to ensure that the first limiting protrusion 124 is firmly inserted into the first limiting hole 114.

Further, a notch 115 is formed at the bottom of the peripheral sidewall of the first housing 11, a third limiting step 221 is formed at one end of the first leg 22 away from the fixing plate 21, and the notch 115 abuts against the third limiting step 221. By adding the notch 115 on the first shell 11 and the third limiting step 221 of the first support leg 22, the accurate assembly of the first shell 11 and the second shell 12 is ensured.

Further, a second limiting protrusion 116 is convexly arranged at the bottom of the peripheral side wall of the first shell 11, a second limiting hole 125 is formed in the base of the second shell 12, and the second limiting protrusion 116 is inserted into the second limiting hole 125. Illustratively, a plurality of second limiting protrusions 116 are disposed at the bottom of the first housing 11, a plurality of second limiting holes 125 are disposed on the base of the second housing 12, and the plurality of second limiting protrusions 116 are inserted into the plurality of second limiting holes 125 in a one-to-one correspondence manner, so as to ensure the assembly firmness of the first housing 11 and the second housing 12.

Further, the charging station for assisting the operation further comprises a marking plate 5, the marking plate 5 is provided with an outer protruding portion 51, the top wall of the first shell 11 is concavely provided with a slot 111, and the outer protruding portion 51 is spliced with the slot 111. The outer surface of the marking plate 5 is provided with two-dimension codes, images, numbers, letters or symbols and other markers, and the robot is used for quickly identifying parameter information such as the position, the model, the charging voltage, the charging current and the like of a charging station for auxiliary operation, so that information interaction is facilitated.

Further, a hook 112 is convexly arranged at the bottom of the slot 111, a locking hole 52 is arranged in the outer convex part 51, and the hook 112 is clamped with the locking hole 52. By adding the cooperation of the hooks 112 and the locking holes 52, the stable assembly of the marking plate 5 on the first shell 11 is further ensured, and the loosening of the marking plate 5 caused by daily blowing or vibration is avoided. The side wall of the marking plate 5 is provided with an unlocking hole 53, the unlocking hole 53 is communicated with the locking hole 52, and a screwdriver can be adopted to prop against the clamping hook 112, so that unhooking is realized.

Specifically, in the present embodiment, at least two slots 111 are concavely disposed on the first housing 11, and at least one hook 112 is convexly disposed in each slot 111. By adding the number of the slots 111 to the first housing 11, the connection stability of the marking plate 5 and the first housing 11 is further ensured.

Further, the slot 111 has a first drain 113 at the bottom, the top wall of the second housing 12 is concavely provided with a water accumulation slot 122, the side wall of the water accumulation slot 122 is provided with a second drain 123, and the water accumulation can be drained from the second drain 123 after passing through the first drain 113 and the water accumulation slot 122 in sequence. When the outdoor weather is weather, rainwater falls into the slot 111 of the first housing 11 easily, and the rainwater falling into the slot 111 is discharged conveniently by additionally providing the first water outlet 113, the water accumulation groove 122 and the second water outlet 123, so that the electric devices in the base station protecting housing 1 are protected. Specifically, a gap exists between the peripheral side wall of the first housing 11 and the peripheral side wall of the second housing 12, and the accumulated water discharged from the second water discharge port 123 is discharged out of the base station protection housing 1 through the gap.

Further, as shown in fig. 14 to 16, the charging station for auxiliary work further includes a charging assembly 6, and the charging assembly 6 is provided at a charging port 13 of a peripheral side wall of the second housing 12. The charging assembly 6 comprises a connecting frame 61, a charging pole piece 62 and an elastic piece 63, wherein the connecting frame 61 is clamped with the charging port 13, the charging pole piece 62 is rotatably arranged on the connecting frame 61, two ends of the elastic piece 63 are connected with the charging pole piece 62, and the middle section of the elastic piece 63 is elastically pressed against the inner wall surface of the charging port 13. Illustratively, the resilient member 63 is a torsion spring. The charging assembly 6 is mounted on the charging port 13 of the base station protective shell 1, the connecting frame 61 of the charging assembly 6 is firmly clamped with the charging port 13, and the charging pole piece 62 can rotate a certain angle relative to the connecting frame 61 to adapt to the height position of the charging part of the operation robot, so that the application range of the charging station is enlarged; because the tail end of the elastic piece 63 is connected with the charging pole piece 62, the middle section of the elastic piece 63 is elastically pressed against the inner wall surface of the charging port 13, so that the charging pole piece 62 always has a trend of pressing the charging part of the operation robot, good contact between the charging pole piece 62 and the charging part is ensured, and the charging efficiency is improved.

Further, a U-shaped groove 612 is provided on the side wall of the connection frame 61, the charging pole piece 62 is provided with a rotating shaft 621, and the rotating shaft 621 is rotatably disposed in the U-shaped groove 612. Specifically, two rotating shafts 621 are arranged at intervals behind the charging pole piece 62, central shafts of the two rotating shafts 621 coincide, two corresponding U-shaped grooves 612 are oppositely arranged on the side wall of the connecting frame 61, the rotating shafts 621 of the charging pole piece 62 can be embedded in the U-shaped grooves 612, the rotating shafts 621 rotate for a certain angle relative to the U-shaped grooves 612 to change the inclination of the charging pole piece 62, and the height of the charging part of different types of operation robots is convenient to adapt.

Further, the rotating shaft 621 is provided with a first travel limiting portion 622 in a protruding manner, the inner wall surface of the charging port 13 is provided with an avoidance groove 131 in a recessed manner, and one end of the first travel limiting portion 622 away from the rotating shaft 621 is arranged in the avoidance groove 131 in a penetrating manner. The charging pole piece 62 deflects upward, and the first travel limiting portion 622 drives downward, until the charging pole piece 62 cannot continue to deflect upward after the first travel limiting portion 622 touches the avoidance groove 131. By adding the escape groove 131 and the first travel limit portion 622, the angle of upward deflection of the charge pole piece 62 is defined.

Further, a second stroke limiting portion 613 is protruded inward from the front end opening of the connection frame 61, and the bottom surface of the charging pole piece 62 is stopped at the second stroke limiting portion 613. Since the charging pole piece 62 has a downward deflection tendency under the action of the elastic member 63, the downward deflection angle of the charging pole piece 62 is defined by adding the second stroke limiting part 613.

Illustratively, the outer wall surface of the connection frame 61 is provided with one of the clamping groove 127 and the clamping projection 614, and the inner side wall of the charging port 13 is provided with the other of the clamping groove 127 and the clamping projection 614, and the clamping groove 127 is clamped with the clamping projection 614. The connection frame 61 and the base station protecting shell 1 are firmly connected by adding the clamping grooves 127 and the clamping protrusions 614. Specifically, in the present embodiment, the engaging protrusion 614 is provided on the connection frame 61, and the engaging groove 127 is concavely provided on the inner side wall of the charging port 13.

Further, the outer wall surface of the connection frame 61 is provided with a guide portion 615, the inner wall of the charging port 13 is provided with a guide groove 132 in a recessed manner, and the guide portion 615 is slidably disposed in the guide groove 132. When the connection frame 61 is assembled to the base station protection shell 1, the guide portion 615 can be inserted into the charging port 13 along the guide groove 132, so that the assembly accuracy of the connection frame 61 and the charging port 13 on the base station protection shell 1 is ensured.

Further, a first limiting step 616 is outwardly protruded at the front end opening of the connection frame 61, a second limiting step 133 is provided at the front end opening of the charging port 13, and the first limiting step 616 is stopped on the second limiting step 133. The assembly precision of the charging port 13 on the connection frame 61 and the base station protecting shell 1 is further ensured through the cooperation of the first limiting step 616 and the second limiting step 133.

Further, the upper surface of the charging pole piece 62 is provided with a water stop flange 623, and the connection frame 61 of the charging assembly 6 is provided with a third water drain 611. The electrode plate of the charging assembly 6 is exposed, rainwater easily flows into the second shell 12 along the electrode plate, and the third water outlet 611 is additionally arranged on the connecting frame 61, so that accumulated water is conveniently discharged, and the normal work of the electric device is ensured.

Further, as shown in fig. 13, the charging station for facilitating the identified auxiliary operation further includes a replacement cover 9, the replacement cover 9 is provided with a plugging portion 91, a limiting opening 92 is provided in the plugging portion 91, the plugging portion 91 can be plugged into the slot 111, and the hook 112 abuts against the inner wall surface of the limiting opening 92. In this embodiment, by adding the replacement cover 9, when the tag board 5 is removed from the charging station, the replacement cover 9 can be mounted on the first housing 11 for blocking dust from entering the base station protection housing 1.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. Charging station, its characterized in that includes:

A base station protective shell;

The mounting box is arranged in the base station protecting shell and comprises a fixing plate, a first supporting leg and a second supporting leg which are integrally formed, the control circuit board is mounted in a limiting groove of the fixing plate, the first supporting leg extends along a first direction relative to the fixing plate, the second supporting leg extends along a second direction relative to the fixing plate, and the direction of the first direction is opposite to that of the second direction;

One end of the first binding post is arranged on the first supporting leg and is electrically connected with the control circuit board, and the other end of the first binding post extends out of the base station protecting shell;

And one end of the second binding post is arranged on the second supporting leg and is electrically connected with the control circuit board, the other end of the second binding post extends out of the base station protecting shell, and two ends of the boundary signal wire are respectively connected with the first binding post and the second binding post.

2. The charging station of claim 1, wherein the base station protective housing comprises a first housing and a second housing, the first housing snap-fits from top to bottom with the second housing and forms a receiving cavity for receiving the mounting case, a top wall of the first housing is stopped against a top wall of the second housing, and a peripheral side wall of the first housing is stopped against a base of the second housing.

3. The charging station of claim 2, wherein the opposite side walls of the fixed plate are provided with first connecting holes, the peripheral side wall of the second housing is provided with second connecting holes, and the first fasteners pass through the first connecting holes to be connected with the second connecting holes.

4. The charging station of claim 2, wherein the peripheral side wall of the first housing is provided with a first limiting aperture, the peripheral side wall of the second housing is outwardly convex provided with a first limiting protrusion, and the first limiting protrusion is inserted into the first limiting aperture.

5. The charging station of claim 2, wherein a notch is formed in a bottom of the peripheral side wall of the first housing, a third limit step is formed at an end of the first leg away from the fixing plate, and the notch abuts against the third limit step.

6. The charging station of claim 2, wherein a bottom of the peripheral sidewall of the first housing is convexly provided with a second limiting protrusion, a base of the second housing is provided with a second limiting hole, and the second limiting protrusion is inserted into the second limiting hole.

7. The charging station according to any one of claims 2-6, wherein the marking plate is provided with an outer protrusion, the top wall of the first housing is recessed with a slot, and the outer protrusion is plugged into the slot.

8. The charging station of claim 7, wherein the slot has a protruding hook at a bottom thereof, and wherein the protruding portion has a locking hole therein, the hook being engaged with the locking hole.

9. The charging station of claim 8, wherein a first water outlet is formed in a bottom of the slot, a water accumulation groove is formed in a top wall of the second housing in a concave manner, a second water outlet is formed in a side wall of the water accumulation groove, and water accumulation can be discharged from the second water outlet after passing through the first water outlet and the water accumulation groove in sequence.

10. The charging station of any of claims 2-6, further comprising a charging assembly disposed on a peripheral side wall of the second housing, the charging assembly connecting frame being provided with a third drain opening.