APPARATUS FOR RECEIVING AND SENDING PARCEL BY DRONE

Abstract

Disclosed is an apparatus for receiving and sending a parcel delivered by a drone, including: a base assembly, configured to be mounted on a building, the base assembly including a platform, in which the platform includes a working surface capable of being horizontally placed; the working surface further includes an operating area for the drone to disengage or engage the parcel; and a barrier assembly, comprising a barrier plate movable with respect to the base assembly, in which in a horizontal state of the working surface, the barrier plate is enabled to be disposed close to an edge of the working surface and between the building and the operating area to separate the operating area from the other side of the barrier plate where the user stays.

Description

TECHNICAL FIELD

The present disclosure relates to an apparatus for receiving and sending a parcel by drone.

BACKGROUND

Drone delivery is becoming more practical for express industry. In order to help user receiving and sending parcel delivered by drone, one existent method is engaging/disengaging parcel via drone on a platform installed outside a balcony or under a windowsill of a building such as a house or a flat. The platform is also accessible to user staying in the building for fetching or placing parcel. However, in the process of parcel being engaged/disengaged by drone, there is a chance of physical contact between user and drone due to failure occurring to drone or due to user's improper behavior, which will cause potential safety hazard for user.

SUMMARY

As such, the present disclosure proposes a relatively safe apparatus for receiving and sending a parcel delivered by drone.

An apparatus for receiving and sending a parcel delivered by a drone is provided, which includes: a base assembly, configured to be mounted on a building, the base assembly comprising a platform, in which the platform includes a working surface capable of being horizontally placed; the working surface further includes an operating area for the drone to disengage or engage the parcel; and a barrier assembly, including a barrier plate movable with respect to the base assembly, in a horizontal state of the working surface, the barrier plate is enabled to be disposed close to an edge of the working surface and between the building and the operating area to separate the operating area from the other side of the barrier plate where the user stays.

BRIEF DESCRIPTION OF DRAWINGS

To better explain the embodiments of the present disclosure or the technical solutions of the prior art, the following will briefly introduce the drawings involved in the description of the embodiments or the prior art.

FIG. 1 is a schematic structural diagram of an apparatus for receiving and sending parcel delivered by drone according to an embodiment illustrating the apparatus mounted on an exterior of a building when ready for drone to engage/disengage parcel;

FIG. 2 is a schematic structural diagram of the apparatus shown in FIG. 1 when on standby;

FIG. 3 is a diagram illustrating the electrical connection of the apparatus in FIG. 1;

FIG. 4 is a schematic structural diagram of the barrier assembly of the apparatus in FIG. 1 from another perspective;

FIG. 5 is an enlarged view illustrating part I of the barrier assembly shown in FIG. 4;

FIG. 6 is a schematic structural diagram of the apparatus shown in FIG. 1 when ready for user to fetch/place the parcel;

FIG. 7 is an enlarged view illustrating part II of the apparatus shown in FIG. 6;

FIG. 8 is an enlarged view illustrating part III of the apparatus shown in FIG. 6;

FIG. 9 is a schematic structural diagram illustrating a lift table of the apparatus shown in FIG. 1;

FIG. 10 is a schematic structural diagram illustrating an apparatus ready for drone to engage/disengage parcel according to another embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram illustrating the apparatus shown in FIG. 10 when ready for user to fetch/place parcel;

FIG. 12 is a schematic structural diagram illustrating an apparatus when ready for drone to engage/disengage parcel according to another embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram illustrating the apparatus shown in FIG. 12 when ready for user to fetch/place the parcel;

FIG. 14 is a schematic structural diagram illustrating the apparatus shown in FIG. 12 when on standby.

DETAILED DESCRIPTION OF THE EMBODIMENTS

For better appreciation of the present disclosure, relevant drawings are referred to with the present disclosure described hereinafter.

As shown in FIG. 1, the apparatus 10 for receiving and sending parcel delivered by drone is applicable for temporary storage of parcel after drone disengages parcel on the apparatus 10 remaining for user to fetch, or after user places parcel on the apparatus 10 remaining for drone to engage. The apparatus 10 is configured to be mounted on a building 20 such as a house or a flat, for example, the apparatus 10 is installed outside a balcony or under a windowsill, enabling user who stays on a balcony or behind a window to fetch or place parcel. The apparatus 10 includes a base assembly 100, a main controller 200, a barrier assembly 300 and a lift table 400.

The base assembly 100 can be mounted on the exterior surface of the building 20 and provides a place for drone to land and for parcel to be placed. Since drone also can disengage or engage parcel when hovering at low height over the base assembly 100, it can be appreciated that it is not necessary for drone to land on the base assembly 100, such that the place provided by the base assembly 100 can be applicable only for parcel placement. The base assembly 100 includes a bracket 110 and a platform 120.

The bracket 110 is configured to be supporting structure of the apparatus 10 and enabled to be mounted on the building 20. In some of the embodiments, the bracket 110 includes two bars 112 which are spaced and paralleled, both of which can be mounted on the building 20.

The platform 120 is mounted on the bracket 110. The platform 120 has a working surface 122 which provides an operating area for drone to disengage or engage parcel. Specifically, in some of the embodiments, the platform 120 is a substantially square board, with the operating area on the working surface 122.

FIG. 2 is jointly referred to. Specifically, the platform 120 is rotatably connected to the bracket 110. The platform 120 rotates to enable the working surface 122 to be substantially horizontal for drone engaging or disengaging parcel in the operating area, and to enable the working surface 122 to be vertical or tilted for the platform 120 closely approaching the building 20.

Specifically, one edge of the platform 120 is pivoted to the bracket 110. The base assembly 100 further includes at least one actuator 130 for driving rotation of platform 120, which is a telescopic actuator. Each end of the actuator 130 is pivoted to the bracket 110 and to the platform 120 respectively. In some of the embodiments, the platform 120 is rotatably connected to both of the bars 112.

Specifically, the actuator 130 is a telescopic hydraulic cylinder or a motorized linear actuator. In addition to being a telescopic actuator, the actuator 130 also can be a stepping motor for driving rotation of platform 120.

The bracket 110 is not limited to be bars 112, in alternative embodiments, the bracket 110 may be a plate-like structure, a frame-like structure, or the like.

The main controller 200 is configured to control the operation of the apparatus 10 by receiving signals from either drone or user's digital device such as a mobile phone or a computer. Besides, the electric control 200 can transmit signal to drone so that the drone can approach, disengage or engage parcel based on the signal received, or the main controller 200 can transmit signal to user's digital device so that the user can fetch or place parcel based on the signal received. In some of the embodiments, the main controller 200 can be mounted on one of the bars 112, the platform 120, the building 20, or the like.

Referring to FIG. 3 jointly, the actuator 130 is electrically connected with the main controller 200 to receive control signal from the main controller 200.

Referring to FIG. 4 with above figures, the barrier assembly 300 includes a barrier plate 310, which can be located close to the edge of the working surface 122 and between the building 20 and the operating area, forming a barrier to separate the operating area from the other side of the barrier plate 310 where the user stays, when the working surface 122 is substantially horizontal. The top of the barrier plate 310 may be higher than drone assuring to separate drone from user securely when drone disengages or engages parcel in the operating area.

The barrier plate 310 is provided with an opening 312, configured to enable parcel to pass through the barrier plate 310 when user needs to fetch the parcel from the operating area or to place the parcel in the operating area. Specifically, in some of the embodiments, the barrier plate 310 is a substantially square plate. A barrier surface 314 is the surface of the barrier plate 310 which is closer to the operating area than the opposite surface of the barrier plate 310.

The barrier assembly 300 further includes a door 320 installed on the barrier plate 310. The door 320 can close the opening 312. Or in alternative embodiments, two doors 320 are installed on the barrier plate 310 and jointly close the opening 312.

Referring to FIG. 5 jointly, the two doors 320 are both provided with locking holes 322. The plate 310 is accordingly provided with an electric lock 330, which can be inserted into the locking holes 322 and lock the doors 320. The electric lock 330 is electrically connected with the main controller 200 to receive control signal from the controller 200.

The barrier assembly 300 further includes a slide rail 340 on the barrier plate 310. The door 320 can be opened or closed by sliding along the slide rail 340.

It can be appreciated that the method of opening and closing the door 320 is not limited to sliding along the slide rail 340. For example, the door 320 is rotatably connected with the barrier plate 310. Furthermore, the door 320 can be opened and closed automatically by a servo and a human body sensor.

Referring to FIG. 6 jointly, further, the barrier plate 310 is movable with respect to the base assembly 100 so as to enable the barrier plate 310 to be positioned close to the edge of working surface 122 and at least part of the barrier plate 310 is disposed above the working surface 122 when the working surface 122 is substantially horizontal. Such arrangement makes the operating area accessible to drone. And the barrier plate 310 is between the building 20 and the operating area to separate the operating area from the other side of the barrier plate 310 where the user stays. The barrier plate 310 can also move to be positioned right above the operating area, such that the working surface 122 and the barrier plate 310 are arranged in a spaced and opposite manner, when the working surface 122 is substantially horizontal. Such arrangement enables the barrier plate 310 to shelter the operating area from rain or snow in order to avoid parcel in operating area rained on or snowed on, and enables the barrier plate 310 to prevent unauthorized drone from accessing to the operating area.

When the barrier plate 310 is close to the edge of the horizontal working surface 122 and between the building 20 and the operating area, the barrier plate may be vertically positioned. When the barrier plate 310 is positioned right above the operating area on the horizontal working surface 122, the barrier surface 314 may be facing to and paralleled to the working surface 122.

An operation method of the barrier plate 310 is described as below. Before drone arrived in the operating area, the barrier plate 310 automatically moves to the position close to the edge of the working surface 122 and between the building 20 and the operating area, in order to separate the operating area from the other side of the barrier plate 310 where the user stays. After drone disengages parcel and flies away from the operating area, or before user places parcel in the operating area, the barrier plate 310 automatically moves to the position right above the operating area, so as the user to fetch or place parcel.

In some of the embodiments, the barrier plate 310 can rotate so that the barrier plate 310 can be positioned close to the edge of the working surface 122 and can be positioned right above the operating area. The barrier plate has a connecting end and a free end. The connecting end of the barrier plate 310 is pivoted to the bracket 110. By rotation of barrier plate 310, the free end can be positioned higher than the connecting end such that the barrier plate 310 separates the operating area from the other side of the barrier plate 310 where the user stays.

Further, the working surface 122 may be vertical or tilted by rotation of the platform 120, allowing the platform 120 to closely approach the building 20, and the connecting end of the barrier plate 310 may be higher than the free end of the barrier plate 310 by rotation of the barrier plate 310, allowing the barrier plate 310 to closely approach the platform when the working surface 122 is vertical or tilted. Under such condition, the platform 120 is between the barrier plate 310 and the building 20, when the apparatus 10 is on standby as shown in FIG. 2.

Referring to FIG. 7 and FIG. 8, the free end of the barrier plate 310 is provided with a striker 315. The bracket 110 is provided with a latch 114 which can clamp the striker 315. When the apparatus 10 is on standby, the free end can be positioned close to the bracket 110. And the latch 114 can clamp the striker 315 to secure the free end on the bracket 110 and to stop the barrier plate 310 from rotation.

The apparatus 10 further includes at least one actuator 500 for driving rotation of the barrier plate 310, which is a telescopic actuator. Each end of the actuator 500 is pivoted to the bracket 110 and to the barrier plate 310 respectively. Specifically, the actuator 500 is a telescopic hydraulic cylinder or a motorized linear actuator. In addition to being a telescopic actuator, the actuator 500 also can be a stepping motor for driving rotation of platform 120.

It can be appreciated that in some other embodiments, the platform 120 is fixed to the bracket 110 and cannot rotate. Under such condition, the working surface 122 may keep being horizontally positioned.

The lift table 400 can be mounted on the platform 120 and can be further positioned in the operating area. The lift table 400 is configured to hold and lift parcel.

In some of the embodiments, the lift table 400 is electrically connected with the main controller 200, and the main controller 200 can control the lift table 400 to raise or lower parcel.

In some of the embodiments, the platform 120 is provided with a hollow 124 in the operating area to accommodate the lift table 400. The lift table 400 is higher than the working area 122 when it fully rises.

Referring to FIG. 9 jointly, in some of the embodiments, the lift table 400 includes a scissors mechanism 410 and a motorized linear actuator 420.

The motorized linear actuator 420 can drive the scissors mechanism 410 to rise and down. And the motorized linear actuator 420 is electrically connected with the main controller 200 to receive control signal from the controller 200.

In some of the embodiments, the apparatus 10 further includes a weight sensor 600 installed in the lift table 400 and electrically connected with the main controller 200. The weight sensor 600 can detect and measure weight of parcel on the lift table 400. Furthermore, the main controller 200 can control the lift table 400 lift up or lift down based on data sent from the weight sensor 600. For example, the data sent from the weight sensor 600 changes on the condition that parcel is put on the lift table 400 or took from the lift table 400, such that the main controller 200 controls the lift table 400 to lift down.

In some of the embodiments, the barrier assembly 300 further includes a sensor 700 electrically connected with the main controller 200. The sensor 700 can detect whether the door 320 closes the opening 312. If the door 320 dose not close the opening 312, the main controller 200 may transmit the signal to stop drone approaching. Furthermore, the main controller 200 can control the lift table 400 to lift up or lift down according to the state of the door 320. In some of the embodiments, the sensor 700 can be a contact switch.

In some of the embodiments, the main controller 200 can control the actuator 130 to drive rotation of the platform 120 according to both data from the weight sensor 600 and the state of the door 320. For example, when the parcel is fetched from the operating area, the weight of the parcel on the lift table 400 is turning to zero. Under such condition, if the door 320 dose not close the opening 312, the main controller 200 control the actuator 130 not to drive the platform 120 rotating; if the door 320 does close the opening 312, the main controller 200 control the actuator 130 to drive the platform 120 rotating so as to fold the apparatus 10 and to enable the platform 120 closely on the building 20.

Further, the barrier assembly 300 includes an alarm 800, which can remind user to close the opening 312 if user forgets to close the opening 312 after fetching or placing the parcel. The alarm 800 is electrically connected with the main controller 200 to receive control signal from the main controller 200. In some of the embodiments, the alarm 800 is installed on the barrier plate 310. It can be appreciated that in some other embodiments, if the door 320 is opened and closed automatically, the alarm 800 may be optional.

Further, one or more markers 316 for drone vision navigation are disposed on the barrier surface 314. The number of the markers 316 can be set as required. Optionally, the markers 316 can be set as Aruco markers. When the barrier plate 310 is positioned close to the edge of the horizontal working surface 122 and at least part of the barrier plate is higher than the horizontal working surface 122, the markers 316 are visible to the drone which is approaching the operating area; when the barrier plate 310 is positioned right above the operating area and sheltering the operating area, the markers 316 are invisible to the drone nearby.

The characteristics and benefits of the apparatus 10 are listed as below:

(1) The barrier plate 310 is movable and is enabled to be positioned between the building 20 and the operating area to separate drone from user, which help reducing the risk of user hurt by drone, or reducing the risk of drone damaged by user. Besides, the barrier plate 310 can block the noise to spread from drone to the interior of the building 20.

(2) The barrier plate 310 is enabled to be positioned right above the operating area, thereby sheltering the operating area from rain or snow in order to avoid parcel in the operating area rained on or snowed on, and preventing unauthorized drone from accessing to the operating area.

(3) The platform 120 is enabled to closely approach the building 20, and the barrier plate 310 is enabled to closely approach the working surface 122. As such, the apparatus 10 can be folded to minimize the height over the exterior surface of the building 20 when is on standby, thereby lowering the impact on apparatus 10 from storm and strong wind. Besides, the platform 120 is between the barrier plate 310 and the building 20, enabling the barrier plate 310 to cover the working surface 122, which help keeping the working surface 122 clean and undamaged.

(4) The lift table 400 can rise to hold parcel disengaged by drone to avoid parcel falling on the working surface 122 directly, and to raise parcel enabling drone to engage. Additionally, the lift table 400 facilitate user to fetch and place parcel if the working surface 122 is too low for user's hand to reach.

It can be appreciated that, in some of the embodiments, the bracket 110 can be optional, and thus the barrier plate 310 and the platform 120 can be mounted on the building 20 directly, one end of the actuator 130 and one end of the actuator 500 are both connected to the building 20. In some other embodiments, the opening 312 and the door 320 may be optional, and thus user can fetch or place parcel through the gap between the barrier plate 310 and the building 20 when the barrier plate 310 is positioned right above the operating area. In still some other embodiments, the lift table 400 is optional and the apparatus 10 cannot lift parcel. In still some other embodiments, the vision markers 316 may be optional.

Referring to FIG. 10 and FIG. 11 jointly, another embodiment of an apparatus 40 for receiving and sending parcel delivered by drone has been presented. The apparatus 40 shown in FIGS. 10 and 11 has a substantially same structure as that of the apparatus 10, except on that one end of the actuator 41 for driving rotation of the barrier plate 42 is connected to the platform 43.

As the apparatus 40 shares a substantially same structure as the apparatus 10, the apparatus 40 has the same characteristics and benefits of the apparatus 10.

Referring to FIG. 12 jointly, another embodiment of the apparatus 50 for receiving and sending parcel delivered by drone has been presented. The apparatus shown in FIG. 12 has a substantially same structure as that of the apparatus 10, except on the structure and motion mechanism regarding the barrier assembly. In some of the embodiments, the barrier assembly includes a barrier plate 51 that can slide in a substantially vertical direction. Optionally, the barrier plate 51 can slide on the bracket 53. And the barrier plate 51 is disposed close to the edge of the working surface 52a when the working surface 52a is substantially horizontal. The barrier plate 310 slides upward until at least part of the barrier plate 51 is disposed above the horizontal working surface 52a to separate the operating area on the working surface 52a from the other side of the barrier plate 51 where the user stays. When drone disengages or engages parcel in the operating area, the top of the barrier plate 51 may be higher than drone assuring to separate drone from user securely. There is no opening or no door with the barrier plate 51. As shown in FIG. 13, the barrier plate 51 also can slide downward to enable the operating area accessible to user, when user needs to fetch or place parcel. Furthermore, when the barrier plate 51 slides downward, the markers 316 on the barrier surface 314 can switch to being invisible to the drone via a cover (not shown in the Fig) fixed to the bracket 53 and in front of the barrier plate 51.

Further, the lift table 54 can slide on the platform 52 to get closer to user before user fetches or places the parcel, comparatively to the embodiments aforementioned. It facilitates user to fetch and place parcel if the operating area is too far for user's hand to reach. In some of the embodiments, the platform 52 is provided with a hollow 52b stretching from the center of the operating area to the border of the working surface 52a. The lift table 54 is installed in the hollow 52b and can slide along the hollow 52b. Before the user fetches or place the parcel, the lift table 54 approaches user by sliding along the hollow 52b, making user easy to fetch parcel from the lift table 54, or easy to place parcel on the lift table 54.

Further, after user fetches parcel, the platform 52 rotates until the working surface 52 is vertical or tilted, allowing the platform 52 to closely approach the barrier plate 51, then the apparatus 40 is on standby as shown in FIG. 14.

The technical features of the above-mentioned embodiments can be combined. In order to simplify the description, not all possible combinations of the technical features of the above-mentioned embodiments have been provided. It can be appreciated that, as long as no contradiction is concluded from these combinations, all reasonable combinations of the features should be considered as the scope recorded in the specification.

The present disclosure mainly presents several embodiments with their descriptions more specific and detailed than others, but they should not be construed as limiting the scope of the present disclosure. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, which shall all fall within the scope of the present disclosure. Therefore, the scope the present disclosure shall be subject to the appended claims.

Claims

1. An apparatus for receiving and sending a parcel delivered by a drone, comprising: a base assembly, configured to be mounted on a building, the base assembly comprising a platform, wherein the platform comprises a working surface capable of being horizontally placed;the working surface further comprises an operating area for the drone to disengage or engage the parcel; anda barrier assembly, comprising a barrier plate movable with respect to the base assembly, wherein in a horizontal state of the working surface, the barrier plate is enabled to be disposed close to an edge of the working surface and between the building and the operating area to separate the operating area from the other side of the barrier plate where a user stays.

2. The apparatus of claim 1, wherein the barrier plate comprises an opening, configured to enable the parcel to pass through the barrier plate, allowing the user to fetch the parcel from the operating area or to place the parcel in the operating area; andthe barrier assembly further comprises at least one door to close the opening.

3. The apparatus of claim 1, wherein in the horizontal state of the working surface,the barrier plate is capable of moving to the position close to the edge of the working surface, where at least part of the barrier plate is disposed above the working surface, allowing the operating area accessible to the drone; andthe barrier plate is also capable of moving to another position right above the operating area, where the barrier plate and the working surface are arranged in a spaced and opposite manner, allowing the barrier plate to shelter the operating area and to prevent the drone from accessing to the operating area.

4. The apparatus of claim 2, wherein in the horizontal state of the working surface,the barrier plate is capable of moving to the position close to the edge of the working surface, where at least part of the barrier plate is disposed above the working surface, allowing the operating area accessible to the drone; andthe barrier plate is also capable of moving to another position right above the operating area, where the barrier plate and the working surface are arranged in a spaced and opposite manner, allowing the barrier plate to shelter the operating area and to prevent the drone from accessing to the operating area.

5. The apparatus of claim 3, wherein the barrier plate is capable of rotating to the position close to the edge of the working surface and to the position right above the operating area;the base assembly further comprises a bracket configured to be mounted on the building, with the platform being installed on the bracket;the barrier plate comprises a connecting end and a free end, with the connecting end being pivoted to the bracket.

6. The apparatus of claim 4, wherein the barrier plate is capable of rotating to the position close to the edge of the working surface and to the position right above the operating area;the base assembly further comprises a bracket configured to be mounted on the building, with the platform being installed on the bracket;the barrier plate comprises a connecting end and a free end, with the connecting end being pivoted to the bracket.

7. The apparatus of claim 5, wherein the platform is rotatably connected to the bracket;the platform is capable of rotating to a position, where the working surface is vertical or tilted, allowing the platform to closely approach the building; andthe barrier plate is capable of rotating to a position, where its connecting end is higher than its free end, allowing the barrier plate to closely approach the platform in the vertical or tilted state of the working surface, thus the platform is between the barrier plate and the building.

8. The apparatus of claim 6, wherein the platform is rotatably connected to the bracket;the platform is capable of rotating to a position, where the working surface is vertical or tilted, allowing the platform to closely approach the building; andthe barrier plate is capable of rotating to a position, where its connecting end is higher than its free end, allowing the barrier plate to closely approach the platform in the vertical or tilted state of the working surface, thus the platform is between the barrier plate and the building.

9. The apparatus of claim 1, further comprising a lift table in the operating area of the platform, wherein the lift table is configured to hold and lift the parcel.

10. The apparatus of claim 9, wherein the lift table is capable of sliding on the platform to approach the user, in the horizontal state of the working surface.

11. The apparatus of claim 9, further comprising: a main controller, anda weight sensor installed in the lift table and electrically connected with the main controller, wherein the weight sensor is configured to detect and measure a weight of the parcel on the lift table.

12. The apparatus of claim 11, wherein the main controller is capable of controlling the lift table to lift up or lift down based on a data sent from the weight sensor.

13. The apparatus of claim 1, wherein in the horizontal state of the working surface,the barrier plate is capable of sliding upward to the position, allowing the barrier plate to separate the operating area form the other side of the barrier plate where the user stays, andthe barrier plate is also capable of sliding downward to another position, allowing the operating area accessible to the user.

14. The apparatus of claim 13, wherein the apparatus further comprises a lift table in the operation area of the platform, the lift table is configured to hold and lift the parcel.

15. The apparatus of claim 14, wherein the lift table is capable of sliding on the platform to approach the user, in the horizontal state of the working surface.

16. The apparatus of claim 13, wherein the platform is rotatable and enables:the working surface to be vertical or tilted, allowing the platform to closely approach the barrier plate.

17. The apparatus of claim 1, wherein one or more makers for the drone vision navigation are disposed on a barrier surface of the barrier plate.

18. The apparatus of claim 17, wherein the markers switch from being visible or invisible to the drone by movement of the barrier plate.

19. The apparatus of claim 3, wherein one or more makers for the drone vision navigation are disposed on a barrier surface of the barrier plate;the markers switch to being visible to the drone when the barrier plate 310 moves to the position close to the edge of the working surface; andthe markers switch to being invisible to the drone when the barrier plate 310 moves to the position right above the operating area.

20. The apparatus of claim 4, wherein one or more makers for the drone vision navigation are disposed on a barrier surface of the barrier plate;the markers switch to being visible to the drone when the barrier plate 310 moves to the position close to the edge of the working surface; andthe markers switch to being invisible to the drone when the barrier plate 310 moves to the position right above the operating area.