Patent Publication Number: US-2021181001-A1

Title: Unmanned aerial vehicle positioning system, handheld rtk positioning device, and sealed quick release structure

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of International Application No. PCT/CN2018/102543, filed on Aug. 27, 2018, the entire content of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the technical field of an enclosure disassembly structure and, more particularly, to an unmanned aerial vehicle (UAV) positioning system, a handheld RTK positioning device, and a sealed quick release structure. 
     BACKGROUND 
     Currently, making a sealed connection through an enclosure opening includes two aspects: quick disassembly and reassembly of the enclosure and secure seal of the enclosure. Trade-offs often need to be made between these two aspects. To realize the quick disassembly and reassembly of the enclosure may sacrifice the secure seal of the enclosure while to realize the secure seal of the enclosure may sacrifice the quick disassembly and reassembly of the enclosure. It is difficult to achieve both the quick disassembly and reassembly of the enclosure and the secure seal of the enclosure at the same time. However, as technologies advance, both quick disassembly and reassembly and the secure seal of the enclosure become highly desired requirement in more and more product designs and play an important role. Thus, more and more products require realization of both quick disassembly and reassembly and the secure seal. Product designs of the existing enclosures are often unable to satisfy this requirement and it is difficult to achieve both the quick disassembly and reassembly and the secure seal of a same enclosure product. 
     SUMMARY 
     In accordance with the disclosure, there is provided a sealed quick release structure. The sealed quick release structure includes a main enclosure provided with an accommodation member and a mounting surface, the mounting surface including an opening in communication with the accommodation member; a sealing cover accommodated in an accommodation groove and slidable in the accommodation groove to cover and seal the opening; and a fixing cover detachably disposed at the mounting surface and including the accommodation groove, the fixing cover being configured to slide relative to the mounting surface and the sealing cover between a lock position, at which the fixing cover is connected with the main enclosure and is pressed against the sealing cover; and an unlock position, at which the fixing cover is separated from the main enclosure to allow the sealing cover to be separated from the opening. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To more clearly illustrate the technical solution of the present disclosure, the accompanying drawings used in the description of the disclosed embodiments are briefly described below. The drawings described below are merely some embodiments of the present disclosure. Other drawings may be derived from such drawings by a person with ordinary skill in the art without creative efforts and may be encompassed in the present disclosure. 
         FIG. 1  is a perspective view of a fixed RTK positioning device according to an example embodiment of the present disclosure. 
         FIG. 2  is a perspective view of a handheld RTK positioning device according to an example embodiment of the present disclosure. 
         FIG. 3  is an exploded view of a sealed quick release structure according to an example embodiment of the present disclosure. 
         FIG. 4  is an exploded view of the sealed quick release structure in  FIG. 3  from another angle. 
         FIG. 5  is a schematic structural diagram of the sealed quick release structure in 
         FIG. 3 . 
         FIG. 6  is a cross-sectional view of the sealed quick release structure in  FIG. 5  along an F-F cross-sectional line. 
         FIG. 7  is a cross-sectional view of the sealed quick release structure in  FIG. 5  along an E-E cross-sectional line. 
     
    
    
     REFERENCE NUMERALS 
     
         
           10 : fixed RTK positioning device 
           11 : tripod 
           20 : sealed quick release structure 
           21 : main enclosure 
           211 : accommodation member 
           212 : mounting surface 
           213 : opening 
           214 : first limit groove 
           215 : second limit groove 
           216 : limit step 
           217 : communication cavity 
           22 : fixing cover 
           220 : receiving groove 
           221 : first limit protrusion 
           2211 : first inclined surface 
           222 : reinforcement rib 
           23 : sealing cover 
           231 : second limit protrusion 
           2311 : second inclined surface 
           232 : step portion 
           24 : sliding structure 
           241 : sliding protrusion 
           242 : guiding groove 
           243 : protruding extension 
           25 : snapping structure 
           251 : positioning hook 
           2511 : limit member 
           252 : positioning sliding groove 
           2521 : sliding member 
           2522 : snapping member 
           2523 : opening portion 
           26 : sealing member 
           27 : locking structure 
           271 : locking hook 
           272 : locking hole 
           28 : secondary fixing cover 
           281 : bolt 
           282 : sealing ring 
           29 : foolproof structure 
           291 : coupling member 
           30 : handheld RTK positioning device 
       
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It will be appreciated that the described embodiments are some rather than all of the embodiments of the present disclosure. Other embodiments obtained by those having ordinary skills in the art on the basis of the described embodiments without inventive efforts should fall within the scope of the present disclosure. 
     As such, a feature indicated in this specification is used to describe one of the features of the embodiments of the present disclosure, rather than implying that the embodiments of the present disclosure must have the described feature. In addition, this specification describes many features. Although certain features are combined to illustrate possible system designs, these features can also be combined in manners that are not explicitly indicated. Thus, unless otherwise specified, the illustrated combinations are not intended to be limiting. 
     In the embodiments shown in the drawings, direction indications (such as up, down, left, right, front, and back) are used to explain structures and movements of various elements of the present disclosure, which are not absolute but relative. When the elements are in positions shown in the drawings, the descriptions are appropriate. If description of the positions of the elements changes, the direction indications will also change accordingly. 
     Hereinafter, some embodiments of the present disclosure will be further described in detail with reference to the accompanying drawings in the specification. In case of no conflict, the embodiments and features described in the embodiments can be combined with each other. 
     The present disclosure provides an unmanned aerial vehicle (UAV) positioning system. Referring to  FIG. 1  and  FIG. 2 , the UAV positioning system includes a fixed real-time kinematic (RTK) positioning device  10  and a handheld RTK positioning device  30 . The fixed RTK positioning device  10  is communicatively connected to the handheld RTK positioning device  30 . The fixed RTK positioning device  10  is provided with a tripod  11 . The tripod  11  is used to support and fix the fixed RTK positioning device  30 . 
     In some embodiments, the handheld RTK positioning device  30  includes a battery module (not shown) and a sealed quick release structure  20 . The battery module is sealed and waterproofly accommodated in the sealed quick release structure  20 . The sealed quick release structure  20  prevents the battery module from being exposed to water and ensures normal operation of the battery module. 
     Referring to  FIG. 3  and  FIG. 4 , in some embodiments, the sealed quick release structure  20  includes a main enclosure  21 , a fixing cover  22 , and a sealing cover  23 . 
     The main enclosure  21  is a primary part of the sealed quick release structure  20 . The main enclosure  21  is a cuboid structure. The main enclosure  21  is provided with an accommodation member  211  and a mounting surface  212 . The accommodation member  211  is a cavity structure for accommodating electronic components of the handheld positioning device  30 . The mounting surface  212  is located at a side surface of the main enclosure  21 . The main enclosure  21  includes an opening  213  at the mounting surface  212 . The opening  213  is in communication with the accommodation member  211 . 
     In some embodiments, the accommodation member  211  is a battery compartment. The battery module is accommodated inside the battery compartment. The battery module is placed into the battery compartment through the opening  213 . Specifically, the battery compartment is a cuboid cavity adapted to a shape and size of the battery module. The sealing cover  23  and the fixing cover  22  seal the battery compartment. 
     The fixing cover  22  is detachably provided at the mounting surface  212 . The fixing cover  22  is able to slide relative to the mounting surface  212  and includes a lock position and a unlock position. The fixing cover  22  is provided with a receiving groove  220 . The receiving groove  220  is a rectangular groove. The fixing cover  22  is fixed to the mounting surface  212 , and is disposed opposite to the accommodation member  211  and the opening  213 . 
     The sealing cover  23  is received inside the receiving groove  220 . The sealing cover  23  is nested in the fixing cover  22  and forms a combined cover structure with the fixing cover  22 . The sealing cover  23  covers the opening  213  for sealing the opening  213 . Moreover, the sealing cover  23  is able to slide in the receiving groove  220 . The sealing cover  23  is able to slide in the fixing cover  22 , such that the fixing cover  22  is able to slide relative to the sealing cover  23  between the lock position and the unlock position. 
     In the sealed quick release structure  20 , the fixing cover  22  and the sealing cover  23  are nested together to form the combined cover structure. Through slidably snapping the sealing cover  23  at the fixing cover  22 , the fixing cover  22  is detachably mounted at the main enclosure  21 . Detachably mounting the fixing cover  22  can realize mounting of the sealing cover  23 . The combined cover structure is easy to assemble and quick to disassemble. When the fixing cover  22  slides to the unlock position, the fixing cover  22  is separated from the main enclosure  21 , such that the sealing cover  23  is separated from the opening  213 . 
     Moreover, the fixing cover  22  preliminarily seals the opening  213  of the man enclosure  21 , and the sealing cover  23  is fixed at the opening  213  to form a double seal, thereby improving the dealing performance of the overall combined cover structure. When the fixing cover  22  slides to the lock position, the fixing cover  22  connects to fix to the main enclosure  21  and presses against the sealing cover  23 . The fixing cover  22  presses against the sealing cover  23  at the opening  213  to further enhance the sealing and waterproof performance. 
     Referring to  FIG. 5  and  FIG. 6 , in some embodiments, the sealing cover  23  and the fixing cover  22  are slidably connected by a sliding structure  24 . The sliding structure  24  is provided between an outer side wall of the sealing cover  23  and an inner side wall of the fixing cover  22 . Because the sealing cover  23  and the fixing cover  22  are nested, the side walls of the sealing cover  23  and the fixing cover  22  are arranged opposite to each other. The sliding structure can be conveniently provided between the side walls of the sealing cover  23  and the fixing cover  22 . In some embodiments, the sliding structure  24  may be disposed at the side wall of the receiving groove  220  relative to the bottom of the receiving groove  220 , which is not limited by the present disclosure. 
     In some embodiments, the sliding structure  24  is disposed adjacent to the sealing cover  23  and the opening  213  of the fixing cover  22 . The sliding structure  24  includes a siding protrusion  241  and a guiding groove  242 . The sliding protrusion  241  is accommodated in the guiding groove  242  and slides along the guiding groove  242 . The sliding protrusion  241  is disposed at the outer side wall of the sealing cover  23 . The guiding groove  242  is disposed at the inner side wall of the fixing cover  22 . 
     The guiding groove  242  is longer than a distance between the lock position and the unlock position. That is, it is ensured that when the sliding protrusion  241  slides along the guiding groove  242 , the sealing cover  23  can be smoothly positioned. 
     In some embodiments, one or more sliding structures  24  are provided. The one or more sliding structures  24  are disposed at opposite sides of the sealing cover  23  and the fixing cover  22 . 
     In some embodiments, the sliding structure  24  further includes a plurality of protruding extensions  243  arranged at intervals. Each protruding extension  243  is provided with the guiding groove  242 . The sliding protrusion  241  is slidably pushed against the protruding extension  243 . The guiding groove  242  is formed on the surface of the protruding extension  243 . Moreover, the guiding groove  242  of each of the plurality of protruding extensions  243  is located on a same straight line and the guiding grooves  242  of the plurality of protruding extensions  243  are connected to form one guiding groove  242 . The sliding protrusion  241  slides along the protruding extensions  243 . 
     The sliding protrusion  241  is shorter than the interval between two adjacent protruding extensions  243 , such that the sliding protrusion  241  can slide into the guiding groove  242  through the gap between two adjacent protruding extensions  243 . When the sliding protrusion  241  meets the gap between two adjacent protruding extensions  243 , the sliding protrusion  241  slides into the guiding groove  242  through the gap, contacts the surface of the protruding extension  243 , and slides on the surface of the protruding extension  243 . 
     A first limit protrusion  221  is disposed at the bottom of the inner side wall of the receiving groove  220  of the fixing cover  22 . A second limit protrusion  231  is disposed at the top of the outer side wall of the sealing cover  23 . When the sealing cover  23  slides to the lock position, the first limit protrusion  221  and the second limit protrusion  231  press against each other so that the fixing cover  22  presses against the sealing cover  23 . 
     When the sealing cover  23  slides relative to the fixing cover  22 , the first limit protrusion  221  and the second limit protrusion  231  get close to each other and press against each other. The first limit protrusion  221  and the second limit protrusion  231  increase the distance between the fixing cover  22  and the sealing cover  23 , thereby pressing the sealing cover  23  toward the main enclosure  21 . 
     The distance between the first limit protrusion  221  and the second limit protrusion  231  is equal to the distance between the unlock position and the lock position. The distance between the first limit protrusion  221  and the second limit protrusion  231  is the distance the sealing cover  23  slides relative to the fixing cover  22 . When the sealing cover  23  slides, the distance the sealing cover  23  slides is equal to the distance between the first limit protrusion  221  and the second limit protrusion  231 . As such, when the sealing cover  23  presses against the fixing cover  22  through the first limit protrusion  221  and the second limit protrusion  231 , the sealing cover  23  slides into a desired position, that is, the fixing cover  22  reaches the unlock position or the lock position. 
     Referring to  FIG. 7 , the first limit protrusion  221  is provided with a first inclined surface  2211  and the second limit protrusion  231  is provided with a second inclined surface  2311 . The first inclined surface  2211  is adapted to the second inclined surface  2311 . When the first inclined surface  2211  is pressed against the second inclined surface  2311 , the first inclined surface  2211  and the second inclined surface  2311  coordinate to facilitate the first limit protrusion  221  and the second limit protrusion  231  to contact with each other and continue to slide, such that the first limit protrusion  221  and the second limit protrusion  231  are pressed against and overlapped with each other. 
     In some embodiments, one or more first limit protrusions  221  and second limit protrusions  231  are provided. The one or more first limit protrusions  221  and the one or more second limit protrusions  231  coordinate to ensure that the sealing cover  23  and the fixing cover  22  are stably pressed against each other so that forces between the sealing cover  23  and the fixing cover  22  are uniform. 
     In some embodiments, four first limit protrusions  221  are provided in two groups. Each group includes two. Four second limit protrusions  231  are provided in two groups. Each group includes two. Two first limit protrusions  221  in a same group are arranged opposite to each other along a sliding direction of the fixing cover  22 . 
     When the sealing cover  23  slides from the unlock position to the lock position, the first limit protrusion  221  located at the front of the sealing cover  23  in the sliding direction has a cross-sectional area resembling a right-angled triangle and is hence called a right-angled first limit protrusion  221 . Correspondingly, the second limit protrusion  231  corresponding to the right-angled first limit protrusion  221  also has a cross-sectional area resembling a right-angled triangle and is hence called a right-angled second limit protrusion  231 . The right-angled first limit protrusion  221  is provided with a first inclined surface and the right-angled second limit protrusion  231  is provided with a second inclined surface. The first inclined surface and the second inclined surface are pressed against each other to assist the right-angled second limit protrusion  231  to slide relative to the right-angled first limit protrusion  221  from the unlock position to the lock position. 
     After the sealing cover  23  slides from the unlock position to the lock position, a right-angled side of the right-angled first limit protrusion  221  and a right-angled side of the right-angled second limit protrusion  231  are pressed against and snapped with each other, thereby preventing the right-angled second limit protrusion  231  from sliding away from the right-angled first limit protrusion  221 . 
     The first limit protrusion  221  located at the rear in the sliding direction of the sealing cover  23  is pressed against another second limit protrusion  231  to spread pressure between the fixing cover  22  and the sealing cover  23 , such that the forces between the fixing cover  22  and the sealing cover  23  are uniform. 
     In addition, when the sealing cover  23  slides to the lock position, the two first limit protrusions  221  are clamped between the two second limit protrusions  231 , such that the first limit protrusions  221  and the second limit protrusions  231  are stably pressed against each other. 
     The first inclined surfaces  2211  of the two first limit protrusions  221  have opposite inclination angles. An angle between the first inclined surface  2211  and an inner bottom surface of the receiving groove  220  of the fixing cover  22  is an acute angle and an angle between the first inclined surfaces  2211  of the two first limit protrusions  221  in a same group is an obtuse angle. Correspondingly, the second inclined surfaces  2311  of the two second limit protrusions  231  have opposite inclination angles. An angle between the second inclined surface  2311  and an outer top surface of the sealing cover  23  is an acute angle and an angle between the second inclined surfaces  2311  of the two second limit protrusions  231  in a same group is an obtuse angle. When a group of the first limit protrusions  221  and a group of second limit protrusions  231  are pressed against each other, the first inclined surface  2211  and the second inclined surfaces  2311  are stably pressed against each other. The inclination angle between the first inclined surface  2211  and the second inclined surface  2311  facilitates the second limit protrusion  231  to slide away between the two first limit protrusions  221 . 
     Reinforcement ribs  222  are provided at the inner side of the fixing cover  22 . The reinforcement ribs  222  ensure the strength of the fixing cover  22  to prevent damages caused by excessive forces. One or more reinforcement ribs  22  are provided and arranged in parallel. Heights of the reinforcement ribs  222  match the shape of the sealing cover  23  and vary with the shape of the sealing cover  23 , such that the reinforcement ribs  222  provided in the fixing cover  22  do not occupy the internal space of the receiving groove  220  of the fixing cover  22  to interfere with the mounting of the sealing cover  23 . 
     The fixing cover  22  and the main enclosure  21  are snap-connected by a snapping structure  25 . The snapping structure  25  includes a positioning hook  251  and a positioning sliding groove  252 . The positioning hook  251  slides along the positioning sliding groove to snap, such that the fixing cover  22  and the main enclosure  21  are snap-connected. The positioning sliding groove  252  matches the shape of the positioning hook  251 . 
     Referring to  FIG. 6 , the positioning sliding groove  252  includes a sliding member  2521  and snapping member  2522 . The snapping member  2522  is disposed at one end of the sliding member  2521 . The sliding member  2521  and the snapping member  2522  form an L-shape. Correspondingly, the positioning hook  251  is also in an L-shape. The sliding member  2521  is in a slim shape. The positioning sliding groove  252  is provided with an opening portion  2523  at the snapping member  2522 . The positioning hook  251  enters the positioning sliding groove  252  through the opening portion  2523 , such that the positioning hook  251  slides along the sliding member  2521 . The positioning hook  251  is provided with a limit member  2511  being pressed against the snapping member  2522 . The limit member  2511  and the snapping member  2522  are pressed against each other when the sealing cover  23  slides to the lock position. When the snapping member  2522  and the limit member  2511  are pressed against each other, the limit member  2511  is accommodated in the opening portion  2523  and is pressed against the snapping member  2522 . Thus, the positioning hook  251  and the positioning sliding groove  252  are snapped and fixed. 
     The sliding member  2521  is longer than the distance between the lock position and the unlock position. When the positioning hook  251  slides along the sliding member  2521  of the positioning sliding groove  252 , the fixing cover  22  is able to move between the lock position and the unlock position. 
     The fixing cover  22  slides relative to the mounting surface  212  in a direction substantially parallel with a direction that the fixing cover  22  slides relative to the sealing cover  23 , thereby facilitating the operation and the mounting of the fixing cover  22 . 
     In some embodiments, the positioning hook  251  is disposed at a periphery of the opening  213  of the main enclosure  21 . The positioning sliding groove  252  is disposed at the opening end of the fixing cover  22 . The positioning sliding groove  252  and the snapping hook  251  are arranged opposite to each other. 
     In some embodiments, the positioning hook  251  is disposed at the opening end of the fixing cover  22  and the positioning sliding groove  252  is disposed at the periphery of the opening  213  of the main enclosure  21 . 
     In some other embodiments, the positioning sliding groove  252  is disposed at the inner side of the fixing cover  22  and the positioning hook  251  is disposed at the outer side of the main enclosure  21 , as long as the positioning sliding groove  252  and the positioning hook  251  are snap-connected. Thus, the fixing cover  22  and the main enclosure  21  are detachably connected. 
     When the fixing cover  22  slides to the lock position, the positioning hook  251  of the main enclosure  21  and the positioning sliding groove  252  of the fixing cover  22  are snap-connected, and the fixing cover  22  is connected relative to the main enclosure  21  and is pressed against the sealing cover  23 . The fixing cover  22  is tightly pressed against the sealing cover  23 , such that the sealing covers  23  seals the opening  213 , thereby ensuring the sealing performance of the accommodation member  211 . 
     When the fixing cover  22  slides to the unlock position, the positioning hook  251  of the main enclosure  21  and the positioning sliding groove  252  of the fixing cover  22  are separated, and the fixing cover  22  is separated relatively from the main enclosure  21 , such that the sealing cover  23  is separated from the opening  213 . Thus, the fixing cover  22  and the sealing cover  23  are relatively detached from the main enclosure  21 , thereby facilitating the disassembly. 
     A first limit groove  214  is provided at the main enclosure  21 . The first limit groove  214  is disposed at the outer side of the opening  213  of the main enclosure  21 . The opening end of the fixing cover  22  is accommodated in the first limit groove  214 . The first limit groove  214  facilitates the alignment and snap-connection between the fixing cover  22  and the main enclosure  21 . 
     A second limit groove  215  is provided at the main enclosure  21 . The second limit groove  215  is disposed in the first limit groove  214  and is arranged opposite to the sealing cover  23 . The opening end of the sealing cover  23  is accommodated in the second limit groove  215 . The second limit groove  215  facilitates the alignment between the sealing cover  23  and the opening  213  of the main enclosure  21 . In addition, a step portion  232  is provided at the outer side wall of the opening end of the sealing cover  23 . The step portion  232  is pressed against the inner side wall of the second limit groove  215 . 
     A limit step  216  is provided at the inner side wall at the bottom of the second limit groove  215 . The step portion  232  of the sealing cover  23  and the limit step  216  are pressed against each other. 
     A sealing member  26  is provided between the sealing cover  23  and the opening  213  of the main enclosure  21 . The sealing member  26  is disposed surrounding the opening  213  of the main enclosure  21 . The sealing member  26  is pressed between the sealing cover  23  and the main enclosure  21 . 
     Specifically, the sealing member  26  is disposed surrounding the step portion  231  if the sealing cover  23 . The step portion  231  of the sealing cover  23  is pressed against the limit step  216 . The sealing member  26  is pressed exactly between the outer side wall of the sealing cover  23  and the inner side wall of the first limit groove  214 . The sealing member  26  is tightly pressed to ensure that the sealing member  26  is able to seal the opening  213 . 
     In some embodiments, the sealing member  26  may be a sealing ring or a sealing gasket. The sealing member  26  may also be a plastic ring or a rubber ring. 
     The sealed quick release structure further includes a lock structure  27 . The lock structure  27  lock-connects the fixing cover  22  with the main enclosure  21 . The lock structure  27  includes a locking hook  271  and locking hole  272 . The locking hook  271  is accommodated in the locking hole  272  to lock the fixing cover  22  with the main enclosure  21 . The locking structure  27  further fixes and snaps the fixing cover  22  with the main enclosure  21  to ensure that the fixing cover  22  and the main enclosure  21  are stably connected. 
     In some embodiments, the lock structure  27  is disposed at a position where the fixing cover  22  and the main enclosure  21  are connected. 
     One or more lock structures  27  may be provided. The one or more lock structures  27  reinforce the connection between the fixing cover  22  and the main enclosure  21 . In some embodiments, two lock structures  27  are provided. 
     The handheld RTK positioning device  30  further includes a communication module. The sealed quick release structure  20  further includes a secondary fixing cover  28 . The main enclosure  21  is provided with a communication cavity  217 . The communication module is accommodated in the communication cavity  217 . The secondary fixing cover  28  seals the communication cavity  217 . The fixing cover  22  seals the battery compartment. 
     The secondary fixing cover  28  is disposed at a side of the fixing cover  22  and is detachably connected to the main enclosure  21 . In some embodiments, the secondary fixing cover  28  is provided with a plurality of screw holes. Correspondingly, the main enclosure  21  is provided with a plurality of screw holes. The secondary fixing cover  28  is fastened to the main enclosure  21  by bolts  281 . In some other embodiments, the secondary fixing cover  28  and the main enclosure  21  may be detachably connected by a snap connection method such as a snap or a hook. 
     One side of the fixing cover  22  is provided with a foolproof structure  29 . The main enclosure  21  is provided with a coupling member  291  coupling with the foolproof structure  29 . The foolproof structure  29  includes a foolproof protrusion or a foolproof hole. In some embodiments, the fixing cover  22  is provided with the foolproof hole. The secondary fixing cover  28  is provided with the coupling member  291 . The coupling member  291  is the foolproof protrusion coupling with the foolproof hole. In some other embodiments, the secondary fixing cover  28  may be omitted. When the secondary fixing cover  28  is omitted, the coupling member may be disposed directly at the main enclosure  21 . 
     Specifically, the fixing cover  22  is provided with the foolproof hole at the side wall facing toward the secondary fixing cover  28  and the secondary fixing cover  28  is provided with the foolproof protrusion at the side wall facing toward the fixing cover  22 . The foolproof protrusion and the foolproof hole are arranged opposite to each other, such that the foolproof protrusion is accommodated in the foolproof hole. In some other embodiments, the foolproof protrusion and the foolproof hole switch places, which is not limited by the present disclosure as long as the foolproof protrusion and the foolproof hole are coupled with each other. 
     When the fixing cover  22  slides relative to the dealing cover  23  to the lock position, the fixing cover  22  is prevented by the foolproof structure  29  and the coupling member  291  from covering the opening  213 . Thus, the foolproof structure  29  prevents the fixing cover  22  and the sealing cover  23  from being assembled when the fixing cover  22  is located at the lock position. 
     When the fixing cover  22  slides relative to the sealing cover  23  to the unlock position, the fixing cover  22  is able to cover the opening  213 . When the fixing cover  22  slides to the lock position, the foolproof structure  29  exactly couples with the coupling member  291 . Only when the fixing cover  22  is located at the unlock position, the fixing cover  22  can be slid to the lock position, such that the fixing cover  22  tightly presses against the sealing cover  23  and the sealing cover  23  tightly presses the opening  213  of the main enclosure  21 . 
     The foolproof protrusion and the foolproof hole are sealed and connected, which prevents the foolproof structure  29  and the foolproof hole from degrading the sealing performance of the sealed quick release structure while ensuring the overall waterproof performance of the sealed quick release structure. 
     A sealing ring  282  is provided between the secondary fixing cover  28  and the main enclosure  21 . The sealing ring  282  keeps the secondary fixing cover  28  and the main enclosure  21  in a sealed connection, ensuring that the communication module in the communication cavity  217  is sealed and waterproof. 
     Referring again to  FIG. 1 , the fixed RTK positioning device  10  also includes the sealed quick release structure  20 . Similarly, the sealed quick release structure  20  may also ensure the sealing performance of electrical modules such as the battery module and the communication module of the fixed RTK positioning device, ensure the waterproof safety, and achieve the airtightness up to IPX7 level. 
     In addition, the sealed quick release structure  20  can be quickly disassembled, which convenient for installation and maintenance. As such, the entire UAV positioning system can also be installed quickly and detachably while ensuring the sealing and waterproof performance, thereby reducing manual maintenance cost. 
     In the specification, specific examples are used to explain the principles and implementations of the present disclosure. The description of the embodiments is intended to assist comprehension of the methods and core inventive ideas of the present disclosure. At the same time, those of ordinary skill in the art may change or modify the specific implementation and the scope of the application according to the embodiments of the present disclosure. Thus, the content of the specification should not be construed as limiting the present disclosure.