Patent Publication Number: US-2022234814-A1

Title: Discharge apparatus for flying object, liquid dripping prevention member, and control method of discharge apparatus for flying object

Description:
TECHNICAL FIELD 
     The present invention relates to a discharge apparatus for a flying object, a liquid dripping prevention member, and a control method of the discharge apparatus for the flying object, and in particular, relates to a technique for preventing liquid dripping from a discharge apparatus mounted on a moving object such as an unmanned flying object. 
     BACKGROUND ART 
     Conventionally, as an example of this type of discharge apparatus for an unmanned flying object (moving object), a bee extermination apparatus as described in PTL 1 has been known. That is, the bee extermination apparatus includes, inside the airframe thereof, a chemical agent supply unit for supplying a chemical agent to a bee nest, and a jetting instrument as a discharge apparatus is mounted on this chemical agent supply unit. 
     CITATION LIST 
     Patent Literature 
     Japanese Patent Application Publication No. 2017-104063 
     SUMMARY OF INVENTION 
     Technical Problem 
     When liquid material is discharged from a discharge apparatus, a part of the discharged material adheres to a nozzle of the discharge apparatus. When the amount of the adhered material increases, there is a possibility that the liquid material forms droplets and causes liquid dripping. Such liquid dripping is unfavorable from the viewpoint of the impact upon the surrounding environment, etc. 
     An object of the present invention is to provide a technique for preventing liquid dripping from a discharge apparatus mounted on a flying object. 
     Solution to Problem 
     In order to achieve the above object, the present invention provides a discharge apparatus for a flying object, the discharge apparatus discharging liquid material from a nozzle mounted on an airframe, the discharge apparatus including: a lid that is capable of opening and closing a discharge port of the nozzle. 
     By using such a discharge apparatus, liquid dripping from the nozzle can be prevented. 
     This discharge apparatus can be configured as follows. 
     1. The discharge apparatus includes a driving unit that opens and closes the lid. 
     Since the lid can be opened and closed, the nozzle can be opened at the time of discharge and can be closed at the time other than discharge. 
     2. The lid rotates via a hinge to open and close the discharge port. 
     The use of the hinge enables smooth opening and closing operations. 
     3. The hinge is provided to be positioned further upward than the discharge port in a perpendicular direction when the flying object is in a flight state. 
     As a result, even when the opening and closing mechanism fails, liquid dripping can be prevented. 
     4. The lid has a concave portion that is provided at a position facing the discharge port when in a closed state and that prevents interference with the discharge port. 
     As a result, contact between the members can be prevented. 
     5. The lid opens and closes the discharge port by sliding in a direction perpendicular to a discharge direction of the liquid material. 
     6. The lid slides by rotational movement or linear movement. 
     7. The lid is a diaphragm mechanism having a plurality of diaphragm blades. 
     These various methods may be used as a method for controlling the lid. 
     8. The lid and the discharge port are positioned such that the discharge port does not abut on the lid when the lid is in a closed state. 
     Thus, no abutting occurs even when the lid is opened and closed. 
     9. The lid is provided with an absorbent material that absorbs the liquid material at a position facing the discharge port when the lid is in a closed state. 
     As a result, the liquid material dripping near the lid can be absorbed so that the liquid dripping can be prevented. 
     10. The lid is opened and closed by pressure generated when the liquid material is discharged. 
     This simplifies the configuration of the opening and closing mechanism. 
     In order to achieve the above object, the present invention provides a discharge apparatus for a flying object, the discharge apparatus discharging liquid material from a nozzle mounted on an airframe, the discharge apparatus including: a solidifying unit that receives and fixes the liquid material that has dripped from a discharge port of the discharge apparatus. 
     As a result, the liquid material that has dripped is fixed and prevented from spilling outside. 
     This discharge apparatus can be configured as follows. 
     1. The solidifying unit includes an absorbent material. 
     Thus, the liquid material can be absorbed and prevented from spilling out. 
     2. The discharge apparatus includes a lid that is capable of opening and closing a discharge port of the nozzle, wherein the solidifying unit is provided at a position facing the discharge port when the lid is in a closed state. 
     In this way, the liquid overflowing from the discharge port can be effectively solidified. 
     3. The discharge apparatus includes a protruding part that protrudes forward in a discharge direction from the discharge port, wherein the solidifying unit is provided on the protruding part. 
     4. The protruding part is formed of the solidifying unit. 
     Accordingly, the liquid can be solidified in the solidifying unit provided on or configuring the protruding part. 
     5. The solidifying unit includes a permeation part that allows the liquid material discharged from the discharge port to permeate therethrough and the absorbent material that absorbs the liquid material that has permeated through the permeation part. 
     Thus, the permeation part permeates the liquid material and can suppress expansion, etc. of the absorbent material that has absorbed the liquid material. 
     In order to achieve the above object, the present invention provides a discharge apparatus for a flying object, the discharge apparatus discharging liquid material from a nozzle mounted on an airframe, the discharge apparatus including: a receiving unit that is provided forward in a discharge direction of the discharging from a discharge port of the discharge apparatus, so as to receive the liquid material that has dripped from the discharge port. 
     As a result, the overflowing liquid material can be received and prevented from leaking to the outside. 
     This discharge apparatus can be configured as follows. 
     1. The receiving unit has a storage portion that stores the liquid material. 
     Thus, even when a certain amount of liquid material overflows, it is possible to handle the overflow. 
     2. The storage portion is a bag-shaped member provided forward in a discharge direction when viewed from the discharge port. 
     Thus, the liquid material can be efficiently stored. 
     3. The receiving unit has a protruding surface that protrudes further downward than the discharge port in a perpendicular direction when the flying object is in a flight state and forward in a discharge direction when viewed from the discharge port. 
     In this way, it is possible to handle liquid dripping that occurs during flight and to prevent the liquid from spilling. 
     4. The protruding surface is provided with an absorbent material that absorbs the liquid material. 
     5. The protruding surface is provided with a damming portion for preventing leakage of the liquid material. 
     6. The protruding surface is provided with a concave portion that stores the liquid material. 
     7. The concave portion is provided in plurality and forward in a discharge direction when viewed from the discharge port. 
     In this way, since various structures can be used for preventing liquid dripping, it is possible to increase the degree of freedom of design by appropriately selecting the structure. 
     8. The discharge apparatus further includes a lid that is openable and closable, the lid forming a closed space together with the protruding surface in a discharge direction from the discharge port when in a closed state, and enabling the liquid material to be discharged to outside from the discharge port when in an open state. 
     Thus, the liquid dripping prevention effect can be further enhanced. 
     9. The protruding surface is a bottom portion of a cylindrical part protruding from a periphery of the discharge port. 
     10. The discharge apparatus further includes a lid that is openable and closable, the lid covering a front end of the cylindrical part when in a closed state, and enabling the liquid material to be discharged to outside from the discharge port when in an open state. 
     The liquid dripping prevention effect can be further enhanced by providing the cylindrical part or providing the lid on the cylindrical part. 
     In order to achieve the above object, the present invention provides a liquid dripping prevention member, which is attachable to and detachable from a discharge apparatus for a flying object, the discharge apparatus discharging liquid material from a nozzle mounted on an airframe. 
     This facilitates replacement or the like of the liquid dripping prevention member. 
     This liquid dripping prevention member can be configured as follows. 
     1. The liquid dripping prevention member includes an engaging portion configured to attach the liquid dripping prevention member to the discharge apparatus for the flying object. 
     2. The engaging portion is a screw portion provided in the liquid dripping prevention member and engages with a screw portion provided in the discharge apparatus for the flying object. 
     3. The engaging portion is a fitting portion where the liquid dripping prevention member and the discharge apparatus for the flying object are fitted to each other so as to be engaged. 
     With these configurations, the maintainability of the liquid dripping prevention member is improved. 
     4. The liquid dripping prevention member has, on an outer peripheral surface thereof, an anti-slip portion. 
     This facilitates replacement of the liquid dripping prevention member. 
     In order to achieve the above object, the present invention provides a control method for controlling a discharge apparatus for a flying object, the discharge apparatus discharging liquid material from a nozzle mounted on an airframe, the control method including: a step of opening and closing a lid provided at a discharge port of the nozzle. 
     As a result, liquid dripping from the nozzle can be prevented. 
     In order to achieve the above object, the present invention provides a control method of a discharge apparatus for a flying object, the discharge apparatus including an opening and closing mechanism and a lid capable of opening and closing a discharge port of a nozzle, the control method comprising: 
     causing, in coordination with a discharge operation by a discharge driving unit, a lid driving unit, which drives the lid, to perform an operation for closing the lid when the discharge operation ends and to perform an operation for opening the lid when the discharge operation starts. 
     As a result, the nozzle is opened when the liquid material is discharged, and liquid dripping from the nozzle can be prevented when the liquid material is not discharged. 
     Advantageous Effects of Invention 
     As described above, according to the present invention, there is provided a technique for preventing liquid dripping from a discharge apparatus mounted on a flying object. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  conceptually illustrates a discharge apparatus for a flying object on which the discharge apparatus according to the present invention is mounted and illustrates a case where an aerosol container is used as the discharge apparatus.  FIG. 1(A)  is a diagram illustrating an overall configuration of the flying object,  FIG. 1(B)  is a cross-sectional view of the discharge apparatus,  FIG. 1(C)  is a view taken in the direction of an arrow C of  FIG. 1(B) ,  FIG. 1(D)  is an explanatory diagram illustrating a state before discharge,  FIG. 1(E)  is a plan view of a discharge driving unit of  FIG. 1(D) , and  FIG. 1(F)  is an explanatory diagram illustrating a state during discharge. 
         FIG. 2(A)  is a cross-sectional view taken in a direction perpendicular to the axis of a sleeve in  FIG. 1  in a case where a radial support member is provided,  FIG. 2(B)  is a diagram illustrating an example of a valve mechanism of the aerosol container in  FIG. 1 , and  FIG. 2(C)  is a diagram illustrating an example of using the power source of a flight control unit as a power source. 
         FIGS. 3(A)  to (C) are diagrams illustrating three methods of the discharge driving unit. 
         FIG. 4(A)  is an explanatory diagram illustrating an example of a remote-control operation by a control terminal of a flying object on which a discharge apparatus is mounted and a discharge operation terminal, and  FIG. 4(B)  is a control block diagram. 
         FIG. 5  is cross-sectional views conceptually illustrating a liquid dripping prevention member of an aerosol container according to Embodiment 1.  FIG. 5(A)  illustrates a closed state, and  FIG. 5(B)  illustrates an open state. 
         FIG. 6  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 2.  FIG. 6(A)  is a cross-sectional view,  FIG. 6(B)  is a perspective view in an open state, and  FIG. 6(C)  is a perspective view in a closed state. 
         FIG. 7  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 3.  FIG. 7(A)  is a perspective view in an open state, and  FIG. 7(B)  is a perspective view in a closed state. 
         FIG. 8  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 4.  FIG. 8(A)  is a perspective view in a closed state, and  FIG. 8(B)  is a perspective view in an open state. 
         FIG. 9  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 5.  FIG. 9(A)  is a cross-sectional view, and  FIG. 9(B)  is a perspective view. 
         FIG. 10  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 6. 
         FIG. 11  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 7.  FIG. 11(A)  is a cross-sectional view of a damming portion,  FIG. 11(B)  is a cross-sectional view of concave portions, and  FIG. 11(C)  is a perspective view of the concave portions. 
         FIG. 12  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 8.  FIG. 12(A)  is a cross-sectional view of a configuration in which an absorbent material is provided in a cylindrical part, and  FIG. 12(B)  is a cross-sectional view of a cylindrical part formed of the absorbent material. 
         FIG. 13  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 9.  FIG. 13(A)  is a cross-sectional view, and  FIG. 13(B)  is an exploded perspective view illustrating a configuration of an absorbent material. 
         FIG. 14  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 11.  FIG. 14(A)  is a cross-sectional view of a damming portion, and  FIG. 14(B)  is a cross-sectional view of concave portions. 
         FIG. 15  illustrates a liquid dripping prevention member of an aerosol container according to Embodiment 11.  FIG. 15(A)  is perspective view in a closed state, and  FIG. 15(B)  is a perspective view in an open state. 
         FIG. 16  illustrates a configuration of a cylindrical part of a liquid dripping prevention member of an aerosol container according to Embodiment 12.  FIG. 16(A)  is a cross-sectional view, and  FIG. 16(B)  is a perspective view. 
         FIG. 17  illustrates a configuration of a cylindrical part of a liquid dripping prevention member of an aerosol container according to Embodiment 13.  FIG. 17(A)  is a cross-sectional view, and  FIG. 17(B)  is a perspective view. 
         FIG. 18  conceptually illustrates a flying object on which a discharge apparatus according to the present invention is mounted and is a diagram illustrating an overall configuration of the flying object in a case where a pump and a tank are used as the discharge apparatus. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, the present invention will be described in detail based on the embodiments illustrates in the drawings. 
     Dimensions, materials, shapes, relative arrangements, and the like of components described in the following embodiments can be changed as appropriate according to a configuration of an apparatus to which the invention is applied and various conditions and are not intended to limit the scope of the invention to the following embodiments. 
     Embodiment 1 
     First, an overall configuration will be described with reference to  FIGS. 1(A) to 1(C) .  FIG. 1  conceptually illustrates a discharge apparatus for a flying object according to Embodiment 1 of the present invention.  FIG. 1(A)  is a perspective view of the entire flying object on which the discharge apparatus is mounted,  FIG. 1(B)  is a cross-sectional view of the discharge apparatus mounted on the flying object, and  FIG. 1(C)  is a view of  FIG. 1(B)  when viewed from a C direction. 
     In  FIG. 1(A) , a reference numeral  100  represents a flying object. The flying object  100  is an unmanned aerial vehicle such as a so-called multicopter. An airframe  101  includes an airframe body  102 , four arms  103  radially extending from the airframe body  102 , and legs  107  for takeoff and landing. Four rotors  104  are provided at the respective ends of the arms  103  via respective motors  105 . In the illustrated example, a quadcopter with four rotors  104  is illustrated. However, various known multicopters such as a tricopter with three rotors and a hexacopter with six rotors are applicable. A yaw axis, a roll axis, and a pitch axis of the airframe  101  are an up-down direction, a left-right direction, and a front-back direction of the paper plane, respectively. An upper side of the paper plane is an upper side of the airframe  101 , and a left side of the paper plane is a front side of the airframe  101 . 
     A discharge apparatus  1  in which an aerosol container is stored is mounted on the outside of the airframe  101  of the flying object  100 , that is, on the undersurface of the airframe body  102  in the illustrated example, via a discharge apparatus supporting part  50 . The discharge apparatus  1  has a long body and is disposed with its longitudinal direction oriented in the roll axis direction, and a nozzle  15  protrudes from a front end portion of the discharge apparatus  1  toward the front of the airframe. 
     As illustrated in  FIG. 1(B) , the discharge apparatus  1  has an aerosol container  10  and discharges contents of the aerosol container  10  in a state of being mounted on the airframe  101 . The contents to be discharged may be not only a liquid but also a liquid containing gas, a gaseous body such as air, power, and the like. 
     The aerosol container  10  is mounted on the airframe  101  in a state of being housed in a sleeve (housing member)  20 . A discharge driving unit  30  for discharging the contents from the aerosol container  10  is built in the sleeve  20 . The sleeve  20  and the aerosol container  10  are replaceable as one unit. In the following description, an assembly in a state where the aerosol container  10  is housed in the sleeve  20  will be referred to as an aerosol container assembly  40 . Hereinafter the configuration of each part will be described. 
     [Aerosol Container] 
     The aerosol container  10  is a container that ejects contents by gas pressure of compressed gas or liquefied gas filled therein, and an existing aerosol container made of metal can be applied, or a container made of plastic having pressure resistance can be used. Various types of actuators each of which has a flow path formed based on a discharge direction or a discharge pattern can be mounted on a stem  12  of the aerosol container  10 . In the illustrated example, an actuator  14  is attached to the stem  12  of the aerosol container  10 . The actuator  14  includes a linear main body  14   a  having a straight discharge flow path and a flange portion  14   b  protruding from the main body  14   a  in an axis-perpendicular direction. The nozzle  15  having a jetting hole  15   a  (see  FIG. 1(C) ) is connected to the main body  14   a  of the actuator  14  via a coupling tube  16 . Whether the contents are discharged in the form of mist or in the form of linear jet flow is selected as appropriate depending on the discharge pattern and the discharge direction of the contents. 
     In the illustrated example, since the aerosol container  10  is used while being horizontally mounted on the undersurface of the airframe  101 , a propellant and the contents to be sealed in this container take a form of isolated type, in which a concentrate product is accommodated in an inner bag, and the propellant is accommodated between the outer periphery of the inner bag and the inner periphery of the container main body. Such an isolated type enables the discharge even when the posture of the aerosol container is lateral (the position of the stem is lateral) or downward (the position of the stem is downward). When liquid material is discharged as the contents of the aerosol container  10 , the liquid material may be discharged in a gel form, a mist form, or the like, in addition to a droplet form. 
     However, the container is not limited to the isolate type. When the aerosol container  10  is used in a posture in which the stem  12  faces upward during discharge, a two-phase or three-phase container provided with a dip tube can be applied. When the aerosol container  10  is used with the stem facing downward, a two-phase or three-phase container with no dip tube can be applied. 
     The propellant is preferably a compressed gas such as carbon dioxide (CO 2 ), nitrogen (N 2 ), or nitrous oxide (N 2 O). In addition, a liquefied gas such as a common hydrocarbon (liquefied petroleum gas: LPG), dimethyl ether (DME), or a fluorinated hydrocarbon (HFO-1234ZE) is also applicable. However, in consideration of safety against fire when heating is performed, a non-flammable fluorinated hydrocarbon, carbon dioxide, nitrogen, nitrous oxide, and the like are preferable, and nitrogen is particularly preferable in consideration of environmental loads. 
     [Configuration of Sleeve  20 ] 
     The sleeve  20  is made of a metal such as aluminum, plastic, or a lightweight material having high strength such as carbon fibers. In addition, not only a hard material but also a soft material, for example, rubber material such as silicone rubber or urethane foam can be used. In short, various materials capable of holding the shape of the housing unit that houses the aerosol container  10  can be used. The term “sleeve” is used to mean a tubular member in which the cylindrical aerosol container  10  is housed. 
     The sleeve  20  includes a sleeve main body  21  having a cylindrical shape with a diameter larger than that of the aerosol container  10 , a first end cover part  22  covering one end of the sleeve main body  21 , and a second end cover part  23  provided at the other end. 
     The first end cover part  22  is detachably screwed and fixed to the sleeve main body  21  via a screw part, and the second end cover part  23  is undetachably fixed to the sleeve main body  21 . The second end cover part  23  and the sleeve main body  21  may be integrally formed. 
     The first end cover part  22  includes a dome-shaped cover main body  222  and a screw cylinder  223  that is screwed into a female screw portion in the sleeve main body  21 . The cover main body  222  has a conical shape with a rounded tip or a dome-shaped curved surface whose diameter is gradually reduced toward the tip end, in consideration of aerodynamic characteristics. With such a shape having good aerodynamic characteristics, an impact of wind (crosswind) in the horizontal direction is reduced, and stable flight can be achieved. 
     The discharge driving unit  30  is housed in the second end cover part  23  located on the bottom side of the aerosol container  10 . The second end cover part  23  includes a cylindrical part  231  that has one end fixed to the rear end portion of the sleeve main body  21  (the end portion on the bottom side of the aerosol container  10 ) and an end plate  232  that closes the other end of the cylindrical part  231 . 
     [Support Structure of Aerosol Container  10 ] 
     The inner diameter of the sleeve  20  is larger than the outer diameter of a body portion  11   a  of the aerosol container  10 . In the sleeve  20  of the present configuration, the aerosol container  10  is positioned with both end parts, such as a head portion and a bottom portion, being supported by the first end cover part  22  and a container holding part  72 . As illustrated in the drawing, when the aerosol container  10  is separated and supported at a certain distance from the wall surface of the sleeve  20 , a heat insulating material or a heat storage material can be interposed in the separation space. However, the body portion  11  a of the aerosol container  10  may be supported without being separated from the inside wall of the sleeve  20 . 
     Further, as illustrates in  FIG. 1(B) , the inside wall of the sleeve  20  may be provided with a plurality of radial support parts  21   a  each of which supports the aerosol container  10  from a direction intersecting the axial direction of the container. The radial support parts  21   a  support the aerosol container  10  with respect to the sleeve  20  such that movement in the axial direction is allowed and movement in the orthogonal direction is prevented. As a support structure, the individual radial support parts  21   a  may have partial contacts with the body portion  11   a  of the aerosol container  10  at respective positions in the circumferential direction, or the radial support part  21   a  may support the entire circumference with an annular wall. 
     The sleeve  20  may not have a sealed structure but may have a structure in which a part of the structure is ventilated. For example, a structure such as a mesh structure or punching can be applied. Such a structure has effects of alleviating the self-cooling with outside air at the time of aerosol discharge, reducing the weight of the sleeve  20 , etc. 
     The bottom portion  11  b of the aerosol container  10  is supported by the container holding part  72  disposed on the second end cover part  23  side, and the head portion side of the aerosol container  10  is supported by a pressing member  221  provided on the first end cover part  22 . 
     The pressing member  221  includes a cylindrical body  221   a  protruding from the top portion of the first end cover part  22  toward the stem  12  in the central axis direction of the aerosol container  10  and an end flange portion  221   b  provided at one end of the cylindrical body  221   a  and fixed to the first end cover part  22 . The coupling tube  16  connecting the actuator  14  and the nozzle  15  is inserted into the inner periphery of the cylindrical body  221   a  of the pressing member  221  in a manner slidable to the axial direction, and the end surface of the cylindrical body  221   a  abuts on or is adjacent to the flange portion  14   b  of the actuator  14 . The pressing member  221  may be formed integrally with the second end cover part  23 . 
     Next, the discharge driving unit  30  will be described with reference to  FIGS. 1(D) to 1(F) . 
     The discharge driving unit  30  is disposed closer to the second end cover part  23  than to the bottom portion  11  b of the aerosol container  10  in the second end cover part  23 . The discharge driving unit  30  is fixed to the second end cover part  23  and moves the aerosol container  10  along the axial direction so as to discharge and stop discharging the contents of the aerosol container  10 . 
     The discharge driving unit  30  moves the aerosol container  10  to the head portion side in the axial direction by pushing the aerosol container  10  in the axial direction from the bottom portion  11  b side. The actuator  14  is pressed against the cylindrical body  221   a  of the pressing member  221  by the movement of the aerosol container  10 , and the reaction force thereof generated pushes the stem  12  into the aerosol container  10  so that a valve mechanism of the aerosol container  10  is opened. When the valve mechanism is opened, the contents are automatically discharged by gas pressure. 
     The discharge driving unit  30  includes a motor  31  serving as a rotary drive source and a cam mechanism  32  that converts rotation of the motor  31  into linear motion of the container holding part  72 . The motor  31  and the cam mechanism  32  are assembled to a frame  301  fixed to the second end cover part  23 . The cam mechanism  32  is provided with a cam  32   a  that is driven to rotate by the motor  31  and a cam follower  32   b  that moves along a cam surface of the cam  32   a.  The rotation of the cam  32   a  is transmitted to the container holding part  72  on the driven side via the cam follower  32   b  and linearly moves the container holding part  72  in a direction of a container central axis N of the aerosol container  10 . The cam  32   a  in the illustrated example is an oval disk cam, and a cam shaft is orthogonal to the central axis of the aerosol container  10 . With this configuration, the rotation of the cam  32   a  is converted into linear motion of the aerosol container  10 . Since the cam  32   a  is a circular disk cam, pressing means such as a spring for maintaining the cam follower  32   b  in constant contact with the cam  32   a  is provided as appropriate. 
     Usually, the minimum-diameter portion of the cam  32   a  abuts on the cam follower  32   b,  and the container holding part  72  is at a retreat limit position so that the valve mechanism of the aerosol container  10  is held in a valve-closed state ( FIG. 1(D) ). When the cam  32   a  is rotated by the motor  31 , the container holding part  72  moves forward in the axial direction. That is, the contact position where the cam  32   a  abuts on the cam follower  32   b  at the retreat limit position is set to have a small radius from the rotation center, and the contact position where the cam  32   a  abuts on the cam follower  32   b  at the forward limit position is set to have a large radius from the rotation center. In the illustrated example, while the valve is opened not at the maximum-diameter portion of the cam  32   a  but at a transition portion from the minimum-diameter portion to the maximum-diameter portion, the valve may be configured to be opened at the maximum-diameter portion. 
     [Configuration of Valve] 
       FIG. 2(B)  illustrates an example of a valve mechanism  13  of the aerosol container  10  by which a valve is opened by the discharge driving unit  30 . 
     That is, the stem  12  is provided with a discharge flow path  12   a  that extends by a predetermined dimension in the axial direction from an end opening, and a stem hole  12   b  serving as a valve hole is opened on a side surface of the stem  12 . This stem hole  12   b  is sealed by the inner peripheral surface of a gasket  13   a  mounted on a hole edge of an insertion hole of a mounting cup  11   d.    
     Usually, the stem  12  pressed in a protruding direction by gas pressure and the pressing force of a spring  13   b  applies pressure in the axial direction to the inner peripheral edge of the gasket  13   a  serving as a valve body, and this brings the inner peripheral surface of the gasket  13   a  into close contact with the hole edge of the stem hole  12   b  constituting a valve seat. The valve-closed state is thereby maintained. 
     When the container holding part  72  is moved to the forward limit by the above-described cam mechanism  32  of the discharge driving unit  30 , the aerosol container  10  is moved toward the first end cover part  22  side, and the flange portion  14   b  of the actuator  14  abuts on the end surface of the pressing member  221 . This relatively pushes the stem  12  toward the inside of the container by the reaction force. When the stem  12  is pushed in, the inner peripheral edge of the gasket  13   a  is bent toward the inside of the container, and the inner peripheral surface of the gasket  13   a  is separated from the hole edge of the stem hole  12   b  so that the valve is opened. The contents pushed by the gas pressure is thereby discharged from the discharge flow path  12   a  of the stem  12 . 
     The valve mechanism  13  in the illustrated example is an example and is not limited to such a configuration. Various configurations in which the valve-closed state is usually maintained and the valve is opened by pushing in the stem  12  can be applied. 
     In this example, the rotary motion of the motor  31  is converted into linear motion by the cam mechanism  32 . However, the present invention is not limited to the cam mechanism  32 . For example, any mechanism that converts the rotary motion of the motor  31  into linear motion, such as a screw feed mechanism or a rack-and-pinion mechanism, can be applied. Alternatively, instead of the rotary motor, a linear drive source such as a linear motor for linear drive or an electromagnetic solenoid may be used to move the aerosol container  10  in the axial direction without using the motion conversion mechanism. 
     In addition, the nozzle  15  is provided with various kinds of liquid dripping prevention members  700 , which will be described below, or the nozzle  15  itself functions as a liquid dripping prevention member  700 . Further, a nozzle member located further forward than a discharge port in the discharge direction, which is particularly important for exhibiting the liquid dripping prevention function, may be considered as the liquid dripping prevention member  700 . In a case where electric control is needed to exhibit liquid dripping prevention effects, such as the liquid dripping prevention member  700  including a mechanism for opening and closing a lid, the liquid dripping prevention member  700  is connected to a power source by electric wiring. Further, a power source may be disposed in the liquid dripping prevention member  700 . The liquid dripping prevention member  700  is configured to be attachable to and detachable from the discharge apparatus. 
     [Container Holding Part  72 ] 
     The container holding part  72  will be described with reference to  FIGS. 1(D) to 1(F) . 
     The container holding part  72  includes a circular plate portion  72   a  that abuts on the bottom portion  11   b  of the aerosol container  10 , an annular convex portion  72   b  that holds the end portion on the bottom side of the body portion  11  a of the aerosol container  10  from the outer-diameter end portion of the circular plate portion  72   a,  and a coupling axial portion  72   c  provided at the center portion of the motor-side surface of the circular plate portion  72   a.  An anti-slip material  73  that increases the friction force against the container body portion is mounted on the annular convex portion  72   b.    
     [Configuration Example of Discharge Driving Unit] 
     The discharge driving unit  30  illustrated in  FIG. 1  is an example, and other methods illustrated in  FIG. 3  can also be applied as the configuration of the discharge driving unit  30 . In  FIG. 3 , the sleeve  20  is represented by a square for simplification. 
       FIG. 3(A)  illustrates a configuration in which the actuator  14  side of the aerosol container  10  is fixed to the sleeve  20 , and a contact member  30 B that abuts on the bottom portion  11   b  of the aerosol container  10  is pushed upward by a driving part  30 A. The discharge driving unit  30  in  FIG. 1  is an example of this method. In this method, since the actuator  14  side attached to the stem  12  is fixed, the accuracy of the discharge position is improved. Further, this method can correspond to the aerosol containers  10  of various diameters. 
       FIG. 3(B)  illustrates a configuration in which the aerosol container  10  is fixed to the sleeve  20 , and the stem  12  is pushed downward by the discharge driving unit  30  via the actuator  14 . That is, the discharge driving unit  30  drives in a direction in which the contact member  30 B abutting on the actuator  14  is pushed downward by the driving part  30 A. In this way, the mechanical mechanisms can be concentrated on one side of the aerosol container  10  so that a compact and easy-to-replace structure is achieved. Further, this method can correspond to the aerosol containers  10  of various heights. 
     Note that the driving part  30 A in  FIGS. 3(A) and 3(B)  can have any configuration as long as a mechanism for driving in a linear direction is used. For example, a motion conversion mechanism such as a cam mechanism that converts the rotary motion of the rotary motor into motion in a linear direction or a screw feed mechanism may be used, or instead of using the rotary motor, a linear motor for linear drive, an electromagnetic solenoid, or the like may be used. 
       FIG. 3(C)  illustrates a configuration in which an external valve  30 C, instead of the valve inside the aerosol container  10 , is used for control. In the drawing, the external valve  30 C is conceptually illustrated, and a configuration in which opening and closing are driven by using an electromagnetic valve or the like is achieved. When the external valve  30 C is used, since the stem  12  of the aerosol container  10  is simply connected to a duct  30 D, the aerosol container  10  is easily attached, and the opening and closing control operation is easily performed. In a case of using the existing aerosol container  10 , for example, when the aerosol container  10  is assembled, the stem  12  is pushed in so as to constantly hold the internal valve in an open state. 
     [Electric Facility] 
     Next, returning to  FIG. 1(A) , an electric facility for driving the discharge driving unit  30  will be described.  FIG. 1(A)  conceptually illustrates an electric facility mounted on the flying object. 
     A discharge apparatus control unit  210  is a control apparatus that controls the discharge driving unit  30  and is provided independently from a flight control unit  110 , which controls the flight of the flying object  100 , on the airframe  101  side, together with the flight control unit  110 . Further, a discharge apparatus power supply  211  that drives the discharge driving unit  30  is provided independently from a power supply that drives the flying object  100  (which is incorporated in the flight control unit  110  and is not illustrated) and is mounted on the airframe  101  side. 
     Further, a discharge apparatus communication unit  212  including an antenna for remotely controlling the discharge apparatus  1  is provided independently from a flight communication unit  112  including an antenna for remotely controlling the flying object  100  and is mounted on the airframe  101 . 
     Part or all of the flight control unit  110 , the flight communication unit  112 , and the flight power supply may serve as the discharge apparatus control unit  210 , the discharge apparatus communication unit  212 , and the discharge apparatus power supply  211 .  FIG. 2(C)  illustrates an example in which a power supply provided in the flight control unit  110  is shared. 
     In a case where a control unit, a power supply unit, and a communication unit for operating the liquid dripping prevention member  700  are needed, the discharge apparatus control unit  210 , the discharge apparatus power supply  211 , and the discharge apparatus communication unit  212  may serve as the control unit, the power supply unit, and the communication unit. 
     [Structure to Support Discharge Apparatus on Airframe] 
     The discharge apparatus supporting part  50  that supports the discharge apparatus  1  on the airframe  101  may have, for example, a slide-type fitting structure using a slide rail and a T-shaped groove, or an attachable and detachable structure in a rotational direction such as bayonet coupling. Further, various support means that facilitate attachment and detachment, such as screwing, clip coupling, and clamping, can also be applied, and the discharge apparatus supporting part  50  may be provided with a direction changing device such as a gimbal. 
     Further, the discharge apparatus supporting part  50  may be provided with an electrical contact that electrically connects the discharge apparatus control unit  210  and the discharge apparatus power supply  211  disposed on the airframe  101  side to the motor  31  of the discharge driving unit  30 , or a connector disposed on the airframe  101  may directly be connected from the sleeve  20  by a cable or the like. In addition, a power supply such as a secondary battery and a wireless communication device may be provided in the sleeve  20 , and an electric signal from the flight control unit  110  disposed on the airframe  101  side may be transmitted to and received from the discharge apparatus control unit  210  in the sleeve  20  by wireless communication. 
     Next, the operations of the discharge apparatus for the flying object according to the present invention will be described. 
     [Replacement Operation] 
     The aerosol container assembly  40  for replacement in which the aerosol container  10  is housed in the sleeve  20  as illustrated in  FIG. 1(B)  is prepared in advance. Upon replacement, the aerosol container assembly  40  is detached from the discharge apparatus supporting part  50 , and a new aerosol container assembly  40  is attached thereto. For example, by configuring the discharge apparatus supporting part  50  such that the attaching and detaching can be easily performed by a manual operation without using a tool, the replacement is easily performed. After the replacement of the aerosol container assembly  40 , the aerosol container  10  is removed from the sleeve  20 , and the gas and contents in the aerosol container  10  are completely discharged for disposal. The sleeve  20  can be repeatedly used. In addition, with this embodiment, it is possible to replace only the aerosol container  10  while the sleeve  20  is fixed to the airframe  101 . 
     [Spraying Operation] 
     Next, Spraying operation will be described with reference to  FIG. 4 .  FIG. 4(A)  is an explanatory diagram illustrating an example of remote-control operations of a control terminal and an operation terminal of the flying object on which the discharge apparatus is mounted, and  FIG. 4(B)  is a simple control block diagram. 
     In the spraying operation, as illustrated in  FIG. 4(A) , the flight of the flying object  100  is remotely controlled by a control terminal  120 , and the discharge apparatus  1  is remotely controlled by an operation terminal  160 . The operation terminal  160  is also used as a controller of a camera  106  mounted on the flying object  100 . The operation terminal  160  is provided with, for example, a discharge button  163 , a stop button  164 , and a display  167 . 
     When an operator presses the discharge button  163 , a discharge operation is performed. In this operation, a discharge command signal is transmitted, the transmitted signal is received by the discharge apparatus communication unit  212  mounted on the flying object  100 , and the contents are discharged. That is, when the operator presses the discharge button  163  while viewing an image on the display  167 , a discharge command signal is transmitted, and the discharge apparatus communication unit  212  mounted on the flying object  100  receives the transmitted signal. This causes the discharge apparatus control unit  210  to drive the discharge driving unit  30 , and the stem  12  of the aerosol container  10  is pushed in. The contents are thereby discharged. When the operator presses the stop button  164 , a stop command signal is transmitted, and the pushing of the stem  12  is released by the discharge driving unit  30  so that the discharge is stopped. 
     In a case where the liquid dripping prevention member  700  needs to be controlled at the time of discharge, for example, a lid that is openable and closable is provided, and in a case where the lid needs to be opened at the time of discharge, the control operation for opening the lid is performed manually or automatically before the start of the discharge. 
     [Configuration Example of Liquid Dripping Prevention Member] 
       FIG. 5(A)  illustrates the liquid dripping prevention member  700  in the closed state, and  FIG. 5(B)  illustrates the liquid dripping prevention member  700  in the open state. The liquid dripping prevention member  700  according to the present embodiment roughly includes a mounting part  710  that maintains connection with the coupling tube  16  when mounted, a lid  720  that is openable and closable, and a prevention member driving unit  730  (driving unit) that opens and closes the lid. 
     The mounting part  710  indicated by hatching in the drawing includes an inner fitting part  711  and an outer fitting part  712  as a configuration for fitting the coupling tube  16  with each other. The inner fitting part  711  is a short tubular member that protrudes in the longitudinal direction so as to be inserted into the tube at the time of fitting. The outer diameter of the inner fitting part  711  is smaller than the inner diameter of the coupling tube  16 . Further, a pressure contact portion  711   c  is formed near the protruding end of the inner fitting part  711 . Since the outer diameter of the pressure contact portion  711   c  is larger than the inner diameter of the coupling tube  16 , when the elastic inner fitting part  711  is inserted into the coupling tube, the pressure contact portion  711   c  presses the coupling tube  16  from the inside. Thus, the friction between the coupling tube  16  and the inner fitting part  711  increases, and the connection is thereby maintained. 
     The outer fitting part  712  is a short tubular member having an inner diameter larger than the outer diameter of the coupling tube  16  such that the coupling tube  16  is inserted into the inside of the outer fitting part  712 . 
     An end surface  713  of the mounting part  710  is provided with a tip portion  714  protruding outward. A passage hole  715  for liquid material is formed inside the tip portion  714 . This enables the shape of the discharge port to be changed only by replacing the tip portion  714 , compared to a case where the end surface  713  is simply provided with a hole serving as a discharge port. Thus, greater versatility can be achieved. 
     With this configuration, an inner space  16   a  of the coupling tube  16 , an inner space  711   a  of the mounting part  710 , and a passage area for liquid material formed as the passage hole  715  are formed, and the discharge port is disposed at the front end of the passage hole  715 . 
     According to the liquid dripping prevention member  700  of the present configuration, the existing coupling tube  16  can be mounted without making any change, and the discharge performance as the nozzle  15  can be maintained. Note that the configuration of the mounting part is not limited to this configuration. For example, a method in which the outer fitting part  712  abuts on the coupling tube  16  and is fixed by friction may be used, or a configuration in which the coupling tube  16  abuts on both the outer fitting part  712  and the inner fitting part  711  may be used. Further, a front end portion  161  of the coupling tube  16  may be positioned by abutting on an inner wall  716  of the base of the mounting part  710 . 
     The lid  720  includes a flat plate-shaped lid main body  721  connected to the mounting part  710  by a lid connection part  722 . The lid main body  721  has an area that covers at least the front end portion  161 . The lid connection part  722  has a hinge structure and rotatably supports the lid main body  721 . As illustrated in  FIG. 5(B) , a lid body concave portion  723  having a size that prevents interference (contact) between the tip portion  714  and the lid main body  721  even in the closed state is formed in the lid main body  721  at a position facing the tip portion  714  in the closed state. 
     The lid main body  721  is connected to a linear motion part  732  of the prevention member driving unit  730  (driving unit) via a linear motion connecting member  731 . Both ends of the linear motion connecting member  731  are configured as hinges. 
     The prevention member driving unit  730  according to the present embodiment is a solenoid actuator. In a base  733  of the prevention member driving unit  730 , the linear motion part  732  that is movable to the left and right in the drawing in accordance with a command from the discharge apparatus control unit  210  is disposed. The driving unit is not limited to the solenoid actuator. As long as the driving unit has an opening and closing mechanism capable of opening and closing the lid main body  721 , for example, an electric-field-responsive polymer actuator, an artificial muscle actuator such as a dielectric elastomer, a rack-and-pinion mechanism using an electric motor in combination, a worm rack mechanism, or a slide cam mechanism may also be used. 
     In the illustrated example, the hinge of the lid connection part  722  for connecting the lid main body  721  to the mounting part  710  is provided to be positioned above the discharge port in a perpendicular direction when the airframe is in a flight state. With this arrangement, even when the opening and closing mechanism does not work due to a failure of the driving unit during flight, the lid main body  721  maintains the state of covering the discharge port due to gravity. Thus, it is possible to prevent liquid dripping until the airframe returns. 
     By using the prevention member driving unit  730  (lid driving unit) of the present configuration, the nozzle is maintained in the closed state while the discharge is not performed, switched to be in the open state only while the discharge is performed, and switched again to be in the closed state when the discharge ends. Thus, it is possible to prevent liquid dripping from the front end of the nozzle. 
     The trigger for opening and closing the lid may be a direct instruction from the operator. In this case, the operation terminal  160  may be provided with an opening button and a closing button of the lid, in addition to the discharge button  163  and the stop button  164 . Alternatively, the nozzle may be normally maintained in the closed state, and the discharge apparatus control unit  210  may drive the solenoid actuator by interlocking with the pressing of the discharge button  163  to switch the nozzle to be in the open state. In this way, by interlocking the discharge operation with the opening and closing operations of the lid, both the discharge and the liquid dripping prevention can be achieved. 
     In addition, even with a configuration that does not have a mechanism for opening and closing the lid by power, the lid can be opened and closed by pressure generated when the liquid material is discharged. In this case, the configuration of the opening and closing mechanism can be simplified. 
     &lt;Variation&gt; 
     In the embodiment described above, the aerosol container is configured as a container for liquid material, and the discharge apparatus is an aerosol discharge apparatus. However, the discharge apparatus of the present invention is not limited to an aerosol discharge apparatus. 
       FIG. 18  illustrates an example of an unmanned aerial vehicle having a discharge apparatus including a liquid tank  180 , a pump  182  that pumps liquid to a nozzle, a coupling tube  16  as a pipe, which is a flow path of the liquid from the pump to the nozzle, and a nozzle  15  as a discharge port. The tank  180  holds liquid to be discharged. When a spraying operation starts, the pump  182  is operated to pump the liquid. The liquid passes through a coupling tube  184  and is sprayed from the nozzle  15 . By providing the above-described liquid dripping prevention member on the nozzle  15 , liquid dripping from the discharge apparatus is prevented. 
     Next, other embodiments of the discharge apparatus of the present invention will be described. In the following description, only the difference from the above-described embodiment will be described. The same components will be denoted by the same reference numerals, and descriptions thereof will be omitted. 
     Embodiment 2 
     A liquid dripping prevention member  700  according to Embodiment 2 will be described with reference to  FIGS. 6(A) to 6(C) . The liquid dripping prevention member of the present embodiment also includes a lid  720 . However, the mechanism for opening and closing the lid is different. That is, the present embodiment uses a method in which the lid  720  changes its position in a direction intersecting the discharge direction of the discharge material. 
     As illustrated in  FIG. 6(A) , the configurations of a mounting part  710  and a passage of liquid material are the same as those in Embodiment 1. In the present embodiment, a cylindrical part  740  is provided, and a lid  720  is provided at an end portion of the cylindrical part  740 . The length of the cylindrical part  740  is not limited to the illustrated example. The cylindrical part  740  may have any length as long as a lid main body  721  does not come into contact with a tip portion  714  at least during the opening and closing operations. The presence of the cylindrical part  740  can prevent the contact between the tip portion  714  and the lid main body  721 . The cylindrical part  740  will be described below in detail. 
     The lid main body  721  of the present embodiment has an approximately circular shape and is rotatably attached to a driving shaft  734  at a connection portion  736  near the circumference. A prevention member driving unit  730  of the present embodiment is a motor  735  that rotates the driving shaft  734 , and with this rotary motion, the lid main body  721  rotates as illustrated in  FIGS. 6(B) and 6(C) . As a result, the state of the nozzle is switched between the open state in  FIG. 6(B)  and the closed state in  FIG. 6(C) . A discharge apparatus control unit  210  switches the states between the open state and the closed state by controlling the start and stop of the rotation of the motor  735  of the prevention member driving unit  730  and the rotation angle. That is, according to the present embodiment, the control operation for opening and closing the discharge port of the nozzle is performed with a relatively simple configuration and control operation, and liquid dripping can be prevented while the discharge is not performed. 
     The control operation for opening and closing the discharge port can also be performed even by the method using a linear movement in which the lid  720  slides in a direction intersecting the discharge direction, instead of using the rotational movement of the lid  720 . 
     Embodiment 3 
     The present embodiment also uses a method in which the lid  720  changes its position in a direction intersecting the discharge direction. While the lid  720  is rotated or slid in Embodiment 2, a diaphragm mechanism is used as a lid  720  in the present embodiment. 
     A liquid dripping prevention member  700  according to Embodiment 3 will be described with reference to  FIGS. 7(A) and 7(B) . A lid  720  is a diaphragm mechanism provided at an end portion of the cylindrical part  740 . The diaphragm mechanism includes a plurality of diaphragm blades  724  and a diaphragm unit  725  that has a cam or the like and accommodates the diaphragm blades  724 . As the diaphragm mechanism, a mechanism similar to that used in a camera can be used. 
     The configuration of the present embodiment can also prevent liquid dripping from the discharge port. 
     Embodiment 4 
     A liquid dripping prevention member  700  according to Embodiment 4 will be described with reference to  FIGS. 8(A) and 8(B) . The liquid dripping prevention member  700  of the present embodiment includes both a lid  720  and a cylindrical part  740 . The cylindrical part  740  is a member that covers a space in a predetermined range in the discharge direction from a discharge port and forms a cylindrical part space  740   a  to the front in the discharge direction. With the presence of the cylindrical part  740 , a certain degree of liquid dripping prevention effect can be obtained even when a lid main body  721  is in the open state. In addition, by setting the lid main body  721  to the closed state, the liquid dripping prevention effect can be further enhanced. The cylindrical part will be described below in detail. 
     While a solenoid actuator is used as the mechanism for opening and closing the lid in  FIG. 8 , the present invention is not limited to this example, and any method can be adopted. 
     Embodiment 5 
     A discharge apparatus illustrated in a cross-sectional view in  FIG. 9(A)  and a perspective view in  FIG. 9(B)  includes a protruding part  738  having a protruding surface that protrudes forward in the discharge direction of liquid material from a nozzle. The protruding part  738  has a portion that protrudes below the discharge port when the flying object is in the flight state. Thus, the protruding part  738  functions as a receiving unit that receives the liquid material that has dripped. The protruding part  738  may be provided integrally with a mounting part  710  or may be provided separately from the mounting part  710  and used in combination. 
     In the example of  FIG. 9 , the protruding surface of the protruding part  738  is provided with a wall-shaped portion  737  extending perpendicularly from a front end portion in the discharge direction. Therefore, even when the amount of liquid material that has dripped is large, the protruding part functions as a storage portion of the liquid material so that the possibility of the liquid material leaking to the outside is reduced. However, even in a case where the wall-shaped portion  737  is not provided, with the presence of the protruding part  738  functioning as a receiving unit, a certain degree of liquid dripping prevention performance can be obtained. 
     According to the present embodiment, since a mechanism for opening and closing the lid is not needed, the liquid dripping prevention effect can be obtained while the possibility of failure is reduced. However, a lid that covers a front space  735   a  of the discharge port in the discharge direction may also be provided in the liquid dripping prevention member  700  of the present embodiment, and a closed space is formed between the lid and the protruding part so that the effect of preventing leakage may be enhanced. As the mechanism for opening and closing the lid, any mechanism such as the mechanisms described in the other embodiments can be used. 
     Embodiment 6 
     A discharge apparatus in  FIG. 10  includes a cylindrical part  740  that protrudes forward in the discharge direction of liquid material from the periphery of a nozzle. The cylindrical part  740  is formed integrally with a mounting part  710  or is a cylindrical member attached to the mounting part  710 . Providing the cylindrical part  740  has an effect of making it difficult for liquid droplets to fall to the outside of the airframe when liquid dripping occurs. The cylindrical part  740  functions as a receiving unit for the liquid material. 
     In the present embodiment and the other embodiments, the term “cylindrical part” is used. However, the shape of the part is not limited to a strict cylindrical shape. For example, the cross section may be a flat elliptical shape. Alternatively, a shape that has a flat bottom surface, a flat top surface, and a flat side surface, which are connected by a flat surface or a curved surface, may be applied. Further, the cylindrical part may be considered as a kind of protruding part. 
     Embodiment 7 
     A liquid dripping prevention member  700  according to Embodiment 7 will be described with reference to  FIGS. 11(A) to 11(C) . As with the liquid dripping prevention member in Embodiment 6, a liquid dripping prevention member of the present embodiment includes a cylindrical part  740 , and the cylindrical part  740  is further provided with a liquid reservoir portion (storage portion) for a case where liquid dripping occurs. 
     The cross-sectional view in  FIG. 11(A)  illustrates a state in which the cylindrical part  740  is provided with a damming portion  810  as the liquid reservoir portion. The damming portion  810  is a wall-shaped portion provided at the bottom portion (the lower portion in the flight state) of the cylindrical part  740  and prevents the liquid amount that has dripped from leaking from the front end portion of the cylindrical part  740 . 
     The cross-sectional view in  FIG. 11(B)  and the perspective view of  FIG. 11(C)  illustrate a state in which the cylindrical part  740  is provided with a concave portion  820  as the liquid reservoir portion. The concave portion  820  is a groove-shaped portion provided at the bottom portion (the lower portion in the flight state) of the cylindrical part  740  and has a function of storing the liquid amount that has dripped. In the illustrated example, a plurality of concave portions  820  is provided to be arranged in a direction intersecting (orthogonal to) the discharge direction. 
     By providing the damming portion  810  and the concave portion  820  in addition to the cylindrical part  740  as described above, it is possible to effectively prevent the liquid material that has dripped from overflowing to the outside. The number and positions of the damming portions  810  and the number and positions of the concave portions  820  are not limited to the illustrated examples. In addition, a bag-shaped member may be used as a liquid reservoir portion (storage portion) for the liquid material. In this case, by providing the bag-shaped member continuously from the protruding surface serving as the receiving portion of the liquid material, the liquid material can be smoothly guided thereto. 
     Embodiment 8 
     A liquid dripping prevention member  700  according to Embodiment 8 will be described with reference to  FIGS. 12(A) and 12(B) . The liquid dripping prevention member of the present embodiment includes an absorbent material  800  as a solidifying unit of liquid material. 
     A discharge apparatus in  FIG. 12(A)  includes a cylindrical part  740  located forward in the discharge direction, and an absorbent material  800  is further provided on the inner peripheral surface of the cylindrical part  740 . If the absorbent material  800  is provided at least on the bottom surface of the cylindrical part, an effect of absorbing the liquid material that has dripped can be exhibited. As a method for arranging the absorbent material  800 , any method such as sticking with an adhesive or the like, fixing with a band or the like, or fitting and fixing can be adopted. While the absorbent material  800  may be directly installed in the cylindrical part, a jig for facilitating carrying and installation of the absorbent material may be used. 
     As the absorbent material  800 , a material capable of effectively absorbing the discharged material is used. For example, when the liquid material to be discharged contains water as a main component, it is preferable to use a polymer absorbent such as a superabsorbent polymer. 
     In a discharge apparatus illustrated in  FIG. 12(B) , a cylindrical part  740  is formed of the absorbent material  800 . To mold the absorbent material  800  into a cylindrical shape, it is preferable to use a frame body made of resin or metal. Alternatively, the absorbent material  800  may be formed using a material having a certain degree of rigidity and being capable of absorbing liquid material, such as felt, diatomaceous earth, or unglazed ceramic. 
     While the absorbent material is formed into a cylindrical shape here, a configuration in which a protruding part is provided at least below the discharge port may also be adopted. 
     According to the present embodiment, since the absorbent material  800  as the solidifying unit fixes the liquid material that has dripped from the discharge port, the liquid dripping prevention effect is enhanced. 
     Embodiment 9 
     A liquid dripping prevention member  700  according to Embodiment 9 will be described with reference to  FIGS. 13(A) and 13(B) . The liquid dripping prevention member of the present embodiment also includes an absorbent material  800  as a solidifying unit of liquid material. 
     A discharge apparatus in  FIG. 13(A)  includes a cylindrical part  740  located forward in the discharge direction, and the absorbent material  800  is provided on the inner peripheral surface of the cylindrical part  740 . Further inside the absorbent material  800 , a permeation part  801  made of a stainless-steel mesh through which liquid material permeates is provided. Such a configuration can be realized, for example, as illustrated in  FIG. 13(B) , by mounting the absorbent material  800  on the inner peripheral surface of the cylindrical part  740  and further mounting the permeation part  801  on the inner peripheral surface of the absorbent material  800 . 
     According to this configuration, the dripping liquid material permeates through the permeation part  801  and is absorbed by the absorbent material  800  to be fixed. Thus, the liquid material does not leak to the outside. Further, in a case where the absorbent material  800  is made of a material that absorbs moisture, such as a high polymer, since the permeation part  801  functions as a member that suppresses the expansion of the absorbent material that has expanded by absorbing moisture, the expanded absorbent material does not block the discharge port. Thus, it is possible to continue to use the discharge apparatus without deterioration of the original discharge performance. 
     Embodiment 10 
     As the solidifying unit, other than the absorbent material  800 , a heating part that heats and evaporates liquid material or a cooling part that cools and solidifies liquid material can also be used. As such a solidifying unit, a Peltier element capable of controlling both heating and cooling is suitable. If only heating is performed, an electric heating member such as a nichrome wire heater can also be used. Alternatively, by fixing a heating unit, such as a portable body warmer, or a cooling unit, such as a cooling gel, to the protruding part or the cylindrical part with a band or the like, solidification by heating or cooling can be performed. In a case where a lid is provided, as in the case with the absorbent material, the solidifying unit that performs heating or cooling may be provided at a position facing the discharge port inside the lid. 
     Embodiment 11 
     In the embodiments described above, various methods for preventing liquid dripping, such as the method in which a lid is used, the method in which a liquid reservoir portion is provided, and the method in which an absorbent material have been described. These methods can be used in any combination with each other as long as there is no contradiction. 
     For example,  FIG. 14(A)  illustrates a configuration including a lid main body  721  that is openable and closable as well as a damming portion  810  that is provided at the front end of a cylindrical part  740 .  FIG. 14(B)  illustrates a configuration including a lid main body  721  that is openable and closable as well as a cylindrical part  740  that is provided with a plurality of groove-shaped concave portions  820  arranged in a direction intersecting the discharge direction. 
       FIGS. 15(A) and 15(B)  illustrate a configuration including a lid main body  721  that is openable and closable as well as an absorbent material  800  that is provided on the inner peripheral surface of a cylindrical part  740 .  FIG. 15(A)  illustrates a closed state, and  FIG. 15(B)  illustrates an open state. 
     In this way, by combining a plurality of methods, the effect of the liquid dripping prevention member  700  can be enhanced. For example, in a configuration in which the lid is provided, it is preferable to provide an absorbent material that absorbs the liquid material in a portion of the lid facing the discharge port when the lid is in the closed state. 
     Embodiment 12 
     In the present embodiment, an example of a configuration method of the liquid dripping prevention member  700  will be described. In the present embodiment, a cylindrical part  740  is the liquid dripping prevention member  700 . The cylindrical part  740  is detachable from a mounting part  710  via screw members serving as an engaging portion. That is, as illustrated in  FIG. 16(A) , a thread groove  744  formed on the inner surface of an opening provided at one end portion of the cylindrical part  740  is guided by a thread groove  718  formed on an end portion of the mounting part  710  so that the cylindrical part  740  is screwed into the mounting part  710 . The liquid dripping prevention member  700  is thereby formed. The thread grooves provided on both the members can be collectively considered as a screw portion. 
     Here, it is preferable to provide an anti-slip portion  745  on the outer peripheral surface of the cylindrical part  740  as illustrated in  FIG. 16(B) . When the cylindrical part  740  is assembled to the mounting part  710  in the present embodiment, the cylindrical part  740  is rotated about the longitudinal direction as an axis. Thus, a plurality of anti-slip portions extending in a direction orthogonal to the direction of the rotational movement, that is, in the longitudinal direction, is provided. 
     According to the present embodiment, the cylindrical part  740  can be easily replaced, and this improves maintainability. 
     Embodiment 13 
     In the present embodiment, another example of a configuration method of the liquid dripping prevention member  700  will be described. A cylindrical part  740 , which is the liquid dripping prevention member according to the present embodiment, is also detachable from a mounting part  710 . That is, as illustrated in  FIG. 17(A) , an insertion portion  746  as an engaging portion provided at one end portion of the cylindrical part  740  is fitted into an insertion receiving portion  719  provided at an end portion of the mounting part  710 . The liquid dripping prevention member  700  is thereby formed. The insertion portion  746  and the insertion receiving portion  719  can be collectively considered as a fitting portion. 
     Here, as illustrated in  FIG. 17(B) , it is preferable to provide an anti-slip portion  745  on the outer peripheral surface of the cylindrical part  740 . When the cylindrical part  740  is assembled to the mounting part  710  in the present embodiment, forces act on the cylindrical part  740  in the longitudinal direction. Therefore, a plurality of anti-slip portions is provided in a direction orthogonal to the direction of the forces, that is, in the circumferential direction of the cylindrical part. According to the present embodiment, the cylindrical part  740  can be easily replaced, and this improves maintainability. 
     The liquid dripping prevention members of the embodiments described above can be used in any combination as long as no contraction occurs therebetween. For example, the liquid dripping prevention effect can be improved by freely combining the presence or absence of the cylindrical part or the protruding part, the presence or absence of the absorbent material, the presence or absence of the concave portion or the damming portion, or the like. 
     In each embodiment described above, the example in which a multicopter is used as the flying object on which the liquid material discharge apparatus is mounted has been described. However, the discharge apparatus of the moving object according to the present invention can be applied to a helicopter, can be applied not only to a flying object using a rotor but also to an unmanned aircraft such as a fixed-wing aircraft, an airship, and a gliding aircraft, and can be applied not only to an unmanned aircraft but also to a manned aircraft. Further, not only to a flying object, the present invention can also be widely applied to various manned or unmanned moving objects such as a vehicle traveling on a track and a vehicle traveling on a road surface. 
     REFERENCE SIGNS LIST 
       1 : Discharge apparatus,  10 : Aerosol container,  11  a: Body portion,  11  b: Bottom portion,  11   d:  Mounting cup,  12 : Stem,  12   a:  Discharge flow path,  12   b:  Stem hole,  13 : Valve mechanism,  13   a:  Gasket,  13   b:  Spring,  14 : actuator,  14   a:  Main body,  14   b:  Flange portion,  15 : Nozzle,  15   a:  Jetting hole,  16 : Coupling tube,  16   a:  Inner space 
       20 : Sleeve,  21 : Sleeve main body,  21   a:  Radial support part,  22 : End cover part,  221 : Pressing member,  221   a:  Cylindrical body,  221   b:  End flange portion,  222 : Cover main body,  23 : End cover part,  223 : Screw cylinder,  231 : Cylindrical part,  232 : End plate 
       30 : Discharge driving unit,  30 A: Driving part,  30 B: Contact member,  30 C: External valve,  30 D: Duct,  31 : Motor,  32 : Cam mechanism,  32   a:  Cam,  32   b:  Cam follower 
       40 : Aerosol container assembly,  50 : Discharge apparatus supporting part,  72 : Container holding part,  72   a:  Circular plate portion,  72   b:  Annular convex portion,  72   c:  Coupling axial portion,  73 : Anti-slip material 
       100 : Flying object,  101 : Airframe,  102 : Airframe body,  103 : Arm,  104 : Rotor,  105 : Motor,  106 : Camera,  107 : Leg,  110 : Flight control unit,  112 : Flight communication unit  120 : Control terminal,  160 : Operation terminal,  161 : Front end portion,  163 : Discharge button,  164 : Stop button,  167 : Display 
       180 : Tank,  182 : Pump 
       210 : Discharge apparatus control unit,  211 : Discharge apparatus power supply,  212 : Discharge apparatus communication unit,  301 : Frame 
       700 : Prevention member,  710 : Mounting part,  711 : Inner fitting part,  711 : Mounting part,  711 : Inner fitting part,  711   a:  Inner space,  711   c:  Pressure contact portion,  712 : Outer fitting part,  713 : End surface,  714 : Tip portion,  715 : Passage hole,  716 : Inner wall,  718 : Thread groove,  719 : Insertion receiving portion 
       720 : Lid,  722 : Lid connection part,  723 : Lid body concave portion,  724 : Diaphragm blade,  725 : Unit 
       730 : Prevention member driving unit,  731 : Linear motion connecting member,  732 : Linear motion part,  733 : Base,  734 : Driving shaft,  735 : Motor, 
       735 : Protruding part,  735   a:  Front space,  736 : Connection portion,  737 : Wall-shaped portion,  740 : Cylindrical part,  740   a:  Cylindrical part space,  744 : Thread groove,  745 : Anti-slip portion,  746 : Insertion portion 
       800 : Absorbent material,  801 : Permeation part,  810 : Damming portion,  820 : Concave portion