CN112005996A - Spray head and spray rod assembly - Google Patents

Abstract

The invention discloses a spray head and a spray rod assembly, and belongs to the technical field of plant protection. The spray head comprises a shell; one end of the hose extends into the shell, and the other end of the hose extends out of the shell and is connected with a nozzle; the rotating shaft is rotatably arranged in the shell; a first driving mechanism configured to drive the hose to be wound on or released from the rotary shaft. The utility model provides a spray rod assembly, includes first spray rod and second spray rod, first spray rod with all be equipped with a plurality of above-mentioned shower nozzles on the second spray rod. The spray head provided by the invention can change the extension length of the spray nozzle, and ensures that the pesticide is sprayed to the middle lower part of the canopy of the crop or the ground.

Description

Spray head and spray rod assembly

Technical Field

The invention relates to the technical field of plant protection, in particular to a spray head and a spray rod assembly.

Background

China is a big agricultural country and has wide farmlands and forests, so that a large amount of plant protection operation is needed to spray the pesticide to crops. The application of the pesticide by the plant protection helicopter has the advantages of high operation efficiency, good control effect, high pesticide utilization rate, wide one-time operation area and the like, and meanwhile, the separation of human and pesticide can be realized during spraying operation, so that the harm of the pesticide to operating personnel is avoided, and the plant protection helicopter 10' gradually replaces manpower to become the main force of plant protection operation.

As shown in fig. 1 and 2, the nozzle 3 ' of the conventional spray rod 2 ' is not adjustable, and the falling height of the plant protection helicopter 10 ' is limited, so that the droplets can only be deposited on the upper part of the crops when spraying the medicine, and cannot reach the middle-lower part of the canopy of the crops or the ground, which results in an unsatisfactory spraying effect.

Secondly, the conventional plant protection helicopter 10 'usually adopts the linear type spray rod 2', and has obvious defects in use: first, the downwash flow field generated by the main rotor 102 ' of the plant protection helicopter 10 ' is an unsteady flow field (in fig. 2, the arrow indicates the airflow direction, and the arrow length indicates the airflow strength), and the downwash flow field near the periphery of the main rotor 102 ' is strong, so that the branches and leaves of the crops below the downwash flow field can be turned over, and then the fog drops can be sprayed onto the back of the blades, so that the medicines can be uniformly sprayed on the whole crops. However, under and near the fuselage 101 ', the downwash airflow field is weak and not enough to cause the branches and leaves to turn over, the fog drops cannot be sprayed on the back of the blades, and the crops under and near the fuselage 101 ' after the plant protection helicopter 10 ' flies through cannot be sufficiently sprayed, which affects the uniform growth of the crops.

Disclosure of Invention

The invention aims to provide a spray head which can facilitate a spray nozzle to spray a medicament to the middle lower part of a canopy of a crop or the ground.

Another object of the present invention is to provide a spray bar assembly that allows both the front and back sides of the crop blades directly under and near the body to be sprayed with the chemicals to solve the problem of insufficient spraying of the conventional linear spray bars in the area directly under and near the body.

In order to realize the purpose, the following technical scheme is provided:

a spray head, comprising:

a housing;

one end of the hose extends into the shell, and the other end of the hose extends out of the shell and is connected with a nozzle;

the rotating shaft is rotatably arranged in the shell;

a first driving mechanism configured to drive the hose to be wound on or released from the rotating shaft.

Preferably, the first driving mechanism comprises a first motor, a driving part and a driven part which are arranged in parallel and at intervals, and the hose is clamped between the driving part and the driven part; the output shaft of the first motor drives the driving part to rotate, and then the hose is driven to be wound on the rotating shaft or released by the rotating shaft.

Preferably, the spray head further comprises a tensioning member configured to cause the hose to always have a tendency to wind around the rotating shaft.

Preferably, the tensioning element is a spiral spring, and the central axis of the spiral spring is coincident with the central axis of the rotating shaft;

the spiral spring generates a torque in a plane perpendicular to the central axis of the rotating shaft, which causes the hose to always have a tendency to wrap around the rotating shaft.

Preferably, the wrap spring has a first end disposed centrally and a second end disposed remotely from the center; a first end of the spiral spring is connected to the rotating shaft, and a second end of the spiral spring is connected to the housing.

Preferably, the driving member is a driving roller shaft, the driven member is a driven roller shaft, and center line axes of the output shaft of the first motor, the driving roller shaft, and the driven roller shaft are parallel to a center line axis of the rotating shaft.

Preferably, the rotating shaft has a hollow structure, and an end of the hose, to which the nozzle is not connected, communicates with the rotating shaft.

Preferably, the spray head further comprises a second driving mechanism, and the second driving mechanism comprises a second motor and a guide wheel; the guide wheel is in sliding fit with the spraying rod, and the second motor drives the guide wheel to rotate so as to drive the spray head to slide on the spraying rod.

A spray bar assembly comprises a first spray bar and a second spray bar, wherein a plurality of spray heads in any scheme are arranged on the first spray bar and the second spray bar,

the first spray rod is of a linear structure and extends to the two sides of the machine body to the periphery of the main rotor wing;

the second spraying rod is of an arc-shaped structure which is symmetrical relative to the central axis of the machine body; the front end of the second spray bar can extend to the front side of the fuselage to the vicinity of the periphery of the main rotor.

Preferably, the second spraying rod is of a semicircular structure; the free end of the second spray bar is connected with the first spray bar.

Compared with the prior art, the invention has the beneficial effects that:

(1) the extension length of the nozzle of the spray head provided by the invention is adjustable, so that the spray head reasonably arranges the distance between the nozzle and a target according to the spraying requirement, and the spray head can spray a medicament to the middle lower part of a crop canopy or the ground.

(2) The spray rod assembly provided by the invention comprises the arc-shaped second spray rod, the front end of the second spray rod extends to the front side of the machine body to the periphery of the main rotor wing, so that fog drops can be sprayed to the front and back of crop blades by means of the acting force of the lower washing airflow field, and crops in the area right below the machine body and the area nearby the machine body can be sufficiently sprayed.

Drawings

FIG. 1 is a top view of a prior art spray boom on a plant protection helicopter;

FIG. 2 is a front view of a prior art spray boom on a plant protection helicopter;

FIG. 3 is a first schematic diagram illustrating a portion of a showerhead according to an embodiment of the present invention;

FIG. 4 is a second schematic view illustrating a partial structure of a showerhead according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a spray head disposed on a first spray bar according to an embodiment of the present invention;

FIG. 6 is a control schematic of the control mechanism in an embodiment of the present invention;

FIG. 7 is a top view of a spray bar assembly mounted on a plant protection helicopter in accordance with an embodiment of the present invention;

FIG. 8 is a side view of a spray wand assembly mounted on a plant protection helicopter in accordance with an embodiment of the present invention.

Reference numerals:

in fig. 1 and 2:

10' -a plant protection helicopter; 101' -a fuselage; 102' -a main rotor; 2' -a spray bar; 3' -a spray head;

in FIGS. 3-8:

10-a plant protection helicopter; 101-a fuselage; 102-a main rotor; 103-undercarriage; 104-tail tube;

20-a spraying device;

3-a spray head; 31-a housing; 311-a second stationary shaft; 312-connecting plate; 32-a hose; 33-a nozzle; 34-a rotating shaft; 341-first fixed axis; 35-a first drive mechanism; 351-a first electric machine; 352-drive roll axis; 353-driven roll shaft; 36-a transmission assembly; 361-a first gear; 362-second gear; 363-a third gear; 37-a tensioning member; 371-the spiral spring; 38-a second drive mechanism; 381-guide wheel; 39-first joint;

4-a rotary joint; 41-a joint body; 42-a first interface; 421-a boss; 43-a second interface;

5-a control mechanism; 51-an image collector; 52-acquisition card; 53-computer; 54-a signal converter; 55-a drive;

6-spray bar assembly; 61-a first spray bar; 62-a second spray bar; 63-a first support bar; 64-second support bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used only for the purpose of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely means that the first feature is less than the second feature at a horizontal height.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Example one

The present embodiment provides a spray head 3, and the spray head 3 is optionally provided on a spray bar. The spray head 3 provided by the embodiment can change the extension length of the nozzle 33, so that the distance between the nozzle 33 and a spraying target is changed, the medicine can be sprayed to the middle lower part of the canopy of the crop or the ground, and the spraying effect of the spray head 3 is improved.

Specifically, referring to fig. 3, the head 3 includes a housing 31, a hose 32, and a nozzle 33. The hose 32 has a first end and a second end, the first end of the hose 32 extends into the housing 31 and is communicated with the liquid medicine tank, the second end of the hose 32 extends out of the housing 31 and is communicated with the nozzle 33, so that the medicine can be conveyed to the nozzle 33 through the hose 32, and the nozzle 33 sprays mist to complete the spraying operation.

Further, referring to fig. 4, the nozzle 3 further includes a rotating shaft 34 rotatably disposed with respect to the housing 31, and a portion of the hose 32 located in the housing 31 is wound around the rotating shaft 34. The length of the nozzle 33 extending out of the housing 31 can be changed by the difference of the number of turns of the hose 32 wound around the rotating shaft 34, i.e. the more turns of the hose 32 wound around the rotating shaft 34, the shorter the length of the nozzle 33 extending out of the housing 31 is, and vice versa, and accordingly the spraying height of the nozzle 33 relative to the crops is adjusted. Alternatively, the hose 32 is made of an elastic material so that the hose 32 can be wound around the rotary shaft 34. Optionally, the housing 31 is a rectangular parallelepiped structure. The rotating shaft 34 has a first end and a second end arranged along the axial direction, and the first end and the second end of the rotating shaft 34 are respectively rotatably arranged on two oppositely arranged side walls of the housing 31 through a bearing structure.

The head 3 further includes a first driving mechanism 35 for driving the hose 32 to be wound around the rotary shaft 34 or to be released from the rotary shaft 34. Optionally, the first driving mechanism 35 includes a first motor 351, a driving member and a driven member arranged in parallel and spaced apart, and the hose 32 is arranged to extend out of the housing 31 through a gap between the driving member and the driven member. The outer diameter of the hose 32 in a natural state is larger than the gap between the driving member and the driven member, so that the hose 32 is sandwiched between the driving member and the driven member, and the hose 32 is subjected to a certain extrusion force. The output shaft of the first motor 351 is connected with the driving part to drive the driving part to rotate, and due to the sliding friction between the hose 32 and the driving part, the hose 32 can be wound on the rotating shaft 34 or released from the rotating shaft 34 under the driving of the friction force, so that the length of the nozzle 33 extending out of the shell 31 can be changed. Alternatively, the driving member and the driven member are both roller shaft structures, wherein the driving member is a driving roller shaft 352, and the driven member is a driven roller shaft 353. The central axes of the output shaft of the first motor 351, the drive roller shaft 352, and the driven roller shaft 353 are all parallel to the central axis of the rotary shaft 34. Further alternatively, the first motor 351 is disposed on the housing 31 through a motor base, and the driving roller shaft 352 is rotatably connected to a side wall of the housing 31, so that the rotation of the driving roller shaft 352 is more stable. Further, the driven roller shaft 353 is rotatably connected to the side wall of the housing 31, so that the sliding of the hose 32 with respect to the drive roller shaft 352 is more labor-saving. In order to prevent the hose 32 from being wound around the rotary shaft 34 as much as possible, the first motor 351 may be provided outside the housing 31, and the drive roller shaft 352 and the driven roller shaft 353 may be provided inside the housing 31.

Further, in order to reduce the size of the head 3 in the direction of the central axis of the rotating shaft 34 and to miniaturize the head 3, the first driving mechanism 35 transmits the driving force through the transmission assembly 36. The transmission assembly 36 may adopt a transmission mode such as a gear transmission or a belt transmission, as long as it can transmit the rotation torque of the first motor 351. In this embodiment, a gear transmission is optionally employed. Specifically, the transmission assembly 36 includes a first gear 361, a second gear 362 and a third gear 363 that are engaged in sequence, an output shaft of the first motor 351 is coaxially connected to the first gear 361, the third gear 363 is coaxially connected to the drive roller shaft 352, and the rotational torque of the first motor 351 is transmitted to the drive roller shaft 352 via the first gear 361, the second gear 362 and the third gear 363 in sequence. The second gear 362 and the third gear 363 are rotatably disposed on the housing 31, and optionally on an outer wall of the housing 31. The provision of the transmission assembly 36 eliminates the necessity of the first motor 351 being disposed in the direction of the central axis of the rotary shaft 34, compressing the dimension of the head 3 in this direction; secondly, the rotating speed of the driving roll shaft 352 can be adjusted through the transmission component 36, the winding speed or the releasing speed of the hose 32 is changed, the structure of the spray head 3 is optimized, and the applicability of the spray head 3 is improved.

Since it is necessary to ensure that the part of the hose 32 on the rotating shaft 34 is tightly wound and not scattered during the winding and releasing of the hose 32, the spray head 3 further comprises a tension member 37, the tension member 37 being configured such that the hose 32 always has a tendency to wind on the rotating shaft 34. In this embodiment, the tension member 37 may alternatively be a spiral spring 371, and the central axis of the spiral spring 371 coincides with the central axis of the rotating shaft 34. Scroll spring 371 has a first end disposed centrally and a second end disposed remotely from the center. A first end of the spiral spring 371 is fixedly connected to the rotary shaft 34, and a second end of the spiral spring 371 is fixedly connected to the housing 31. The wrap spring 371 generates a torque in a plane perpendicular to the central axis of the rotary shaft 34, which causes the rotary shaft 34 to always have a tendency to rotate, having the hose 32 wound thereon. When the hose 32 is released from the rotating shaft 34 and continuously extends out of the housing 31 under the driving of the first driving mechanism 35, the torque of the spiral spring 371 continuously increases, and the hose 32 can still be continuously and tightly wound on the rotating shaft 34; when the hose 32 has a tendency to retract into the housing 31 by the first driving mechanism 35, the rotary shaft 34 is rotated by the torque of the spiral spring 371, and the hose 32 is wound around the rotary shaft 34, and a tight winding is ensured without being scattered. In this embodiment, second gear 362 and third gear 363 are optionally located on the same outer wall of housing 31 as scroll spring 371. In specific implementation, referring to fig. 4, when the rotary shaft 34 rotates clockwise as viewed from the right side in fig. 4, the hose 32 is wound around the rotary shaft 34, the rotary shaft 34 rotates counterclockwise, and the hose 32 is released from the rotary shaft 34, so that the spiral spring 371 has a torque to drive the rotary shaft 34 to rotate clockwise. When the first motor 351 drives the first gear 361 to rotate clockwise, the third gear 363 rotates clockwise under the driving of the second gear 362, and further drives the driving roller shaft 352 to rotate clockwise, the driving roller shaft 352 and the hose 32 are squeezed and rubbed with each other, so that the hose 32 extends downwards to extend out of the housing 31, i.e. is released from the rotating shaft 34, meanwhile, the torque of the scroll spring 371 continuously increases, the rotating shaft 34 tends to rotate clockwise due to the torque, and other parts of the hose 32 are still tightly wound on the rotating shaft 34. When the first motor 351 drives the first gear 361 to rotate counterclockwise, the third gear 363 drives the driving roller shaft 352 to rotate counterclockwise, so that the hose 32 tends to move upward, and at the same time, the torque of the spiral spring 371 is released, the rotating shaft 34 can rotate clockwise, the hose 32 is wound on the rotating shaft 34, but the clockwise torque of the spiral spring 371 still exists, and the hose 32 can still be tightly wound on the rotating shaft 34.

Alternatively, the first end of the rotating shaft 34 is provided with a first fixed shaft 341, the first fixed shaft 341 extends out of the sidewall of the housing 31 along the central axis of the rotating shaft 34, the end of the first fixed shaft 341 is provided with a slot, and the first end of the spiral spring 371 is inserted into the slot. The sidewall of the housing 31 is further provided with a second fixed shaft 311 disposed on the same side as the first fixed shaft 341, and a second end of the spiral spring 371 is connected to the second fixed shaft 311.

Because the difference of relief change and planting actual conditions, actual crop interval is not fixed, consequently, the shower nozzle 3 that this embodiment provided can also carry out the adaptability according to the crop interval and adjust, changes its position on the spray rod, adjusts the distance between two shower nozzles 3, further guarantees that the medicine can accurately spray to the middle and lower part or the ground of crop canopy. In order to achieve the above object, referring to fig. 5, the spray head 3 further comprises a second driving mechanism 38, and the second driving mechanism 38 is used for driving the spray head 3 to slide along the spray bar so as to change the position of the spray head 3 on the spray bar. Specifically, the second driving mechanism 38 includes a guide wheel 381 and a second motor for driving the guide wheel 381 to rotate, the guide wheel 381 is slidably fitted with the spray rod through friction, and the guide wheel 381 is optionally connected with the housing 31 to realize integral driving of the spray head 3. When the second motor drives the guide pulley 381 to rotate, the guide pulley 381 and the spray rod slide relatively, so that the guide pulley 381 can drive the spray head 3 to slide along the spray rod. Fig. 5 shows a schematic view of the nozzle 3 disposed on the first spray rod 61, when the second motor drives the guide pulley 381 to rotate reversely, the guide pulley 381 drives the nozzle 3 to slide leftwards along the first spray rod 61, otherwise, when the second motor drives the guide pulley 381 to rotate clockwise, the guide pulley 381 drives the nozzle 3 to slide rightwards along the first spray rod 61. Through the driving action of the second driving mechanism 38, the free movement of the spray heads 3 on the spray bar is realized, and further, the adjustment of the positions of the spray heads 3 on the spray bar and the distance between two adjacent spray heads 3 is realized.

Referring again to fig. 3 and 4, in order to simplify the structure of the head 3, the rotary shaft 34 has a hollow structure, one end of the hose 32, to which the nozzle 33 is not connected, communicates with the rotary shaft 34 through a first joint 39, the rotary shaft 34 communicates with the drug solution tank through a second joint, and the drug in the drug solution tank is delivered to the hose 32 through the rotary shaft 34. Since the rotary shaft 34 rotates relative to the housing 31, the rotary joint 4 is selected as the second joint for normal delivery of the drug in the drug solution tank. The rotary joint 4 comprises a joint body 41, a first interface 42 and a second interface 43, wherein the first interface 42 is a liquid inlet and is communicated with the liquid medicine box; the second port 43 is a liquid outlet, and the second end of the rotating shaft 34 extends out of the housing 31 and is communicated with the second port 43. The second port 43 is a rotary port that is rotatable with respect to the joint body 41. Alternatively, the second port 43 is externally threaded on the periphery thereof, and the rotating shaft 34 is connected with the second port 43 through a threaded structure. Alternatively, the rotary joint 4 may be an L-type rotary joint, and the specific type may be a 1406SR-SS type rotary joint manufactured by tedder technologies. Further optionally, a connecting plate 312 is arranged on the outer wall of the shell 31, and the rotary joint 4 is erected on the connecting plate 312, so that the rotary joint 4 and the shell 31 are placed relatively stably, and the problem that the medicines cannot be smoothly conveyed due to unstable placement of the rotary joint 4 is avoided. Specifically, the connecting plate 312 is formed by one of the sidewalls of the housing 31 extending outward. The connecting plate 312 is provided with a groove, a boss 421 is disposed on the periphery of the first interface 42 of the rotary joint 4, the first interface 42 is clamped in the groove, and the boss 421 is located on the connecting plate 312. Optionally, the boss 421 is a hexagonal nut that is threaded onto the first port 42. More specifically, the groove has an arcuate configuration that matches the outer wall of the first port 42.

By utilizing the characteristics of adjustable positions of the spray heads 3 on the spray rod and adjustable extension lengths of the nozzles 33, the spraying device 20 further comprises a control mechanism 5, and the control spray heads 3 can accurately spray according to the actual conditions of ground crops. The control mechanism 5 comprises an image collector 51, a collection card 52, a computer 53 and a driver 55 which are connected in a communication way. The image collector 51 may be a camera, which may be directly disposed on the nozzle 3, or may be disposed at another position of the plant protection helicopter 10, as long as it can capture the crop and ground truth image below the plant protection helicopter 10. The computer 53 is optionally an on-board computer that can be placed directly on the plant protection helicopter 10. The driver 55 is communicatively connected to the second motor and the first motor 351, so that the driver 55 can drive the second motor and the first motor 351 to perform actions. Referring to fig. 6, the control mechanism 5 specifically controls as follows:

s1: before spraying operation starts, a user inputs numerical values such as preset height, spacing and the like of crops according to actual spraying requirements of the crops, and the input values are stored in a register of the computer 53; meanwhile, the distance from the spray rod to the spray target is set according to the height value of the plant protection helicopter 10 during use; and determines the initial position of the head 3 and the initial extension of the nozzle 33;

s2: spraying operation is started, the camera starts to work, image data of the ground and crops are collected in real time and transmitted to the collection card 52 for signal preprocessing;

s3: the data is processed by the acquisition card 52 and then sent to the computer 53, and the computer 53 recognizes the ground and the crops by reading the RGB values of the ground and the crop image pixels, measures the data such as the height of the crops and the distance between the crops, and compares the data with the input preset value.

S4: according to the comparison result, if the crop spacing exceeds the preset range, a signal is sent to the driver 55, the driver 55 drives the second motor to operate after receiving the signal, and the second motor drives the spray nozzle 3 to move on the spray rod, so that the position of the spray nozzle 3 is adjusted; if the height of the crops exceeds the preset range, a signal is sent to the driver 55, the driver 55 receives the signal and drives the first motor 351 to operate, and the first motor 351 drives the nozzle 33 to adjust the corresponding extending length. Optionally, a signal converter 54 is further disposed between the computer 53 and the driver 55, and the signal is converted by the signal converter 54 and then transmitted to the driver 55. Further alternatively, the signal converter 54 may be a functional module integrated in the driver 55, i.e. integrated with the driver 55, which module is mainly used for performing the functions of converting the signal sent by the computer 53 and transmitting the converted signal to the driver 55.

In specific implementation, the sprayed medicine can be various medicines such as herbicide, fertilizer, pesticide and the like. When spraying the medicine when the herbicide, the spraying target is the ground between the crops, sets for the length that stretches out of nozzle 33 and can guarantee that the medicine sprays ground, according to the change of the crop interval in the real-time image, constantly adjusts the position of shower nozzle 3 on spraying the pole, makes nozzle 33 can spray the medicine on the ground between the crops. When the sprayed pesticide is a pesticide, the pesticide is required to be sprayed onto the leaves of the crops, the position of the spray head 3 is adjusted to enable the spray nozzle 33 to spray the pesticide onto the crops, the extending length of the spray nozzle 33 of the spray head 3 is adjusted according to the change of the height of the crops in the real-time image, and the spray nozzle 33 is ensured to spray the pesticide onto the middle lower part of the canopy of the crops. Of course, in the specific implementation, the position of the spray head 3 and the extension length of the spray nozzle 33 can be adjusted simultaneously according to different spraying requirements and real-time changes of the actual crop spacing and height.

In this embodiment, the position of the nozzle 3 and the extension length of the nozzle 33 are adjusted in real time by the cooperation of the control mechanism 5 and the adjustable nozzle 3, so that the full spraying of the middle-lower part or the ground of the canopy of the crop can be realized, and the problems that the fog drops can only be deposited on the crop and can not reach the middle-lower part or the ground of the canopy of the crop and the spraying effect is not ideal when the traditional nozzle 3 sprays the medicine are overcome.

Example two

Referring to fig. 7 and 8, the present embodiment provides a helicopter 10 for plant protection, the helicopter 10 optionally comprising a fuselage 101, a main rotor 102 disposed above the fuselage 101, a landing gear 103 disposed below the fuselage 101, and a tail pipe 104 disposed at the rear side of the fuselage. The plant protection helicopter 10 is provided with a spraying device 20 for spraying crops. The spray device 20 includes a spray bar assembly 6 and a plurality of spray heads 3 disposed on the spray bar assembly 6. The spray bar assembly 6 is optionally provided on the landing gear 103.

Specifically, the spray bar assembly 6 includes a first spray bar 61 and a second spray bar 62. The first spray bar 61 has a linear structure extending in a first direction, and is symmetrical with respect to a central axis of the body 101 (the central axis of the body 101 is shown by a dotted line in fig. 7, and the first direction is perpendicular thereto). The first spray bars 61 extend in the first direction to both sides of the fuselage 101 to the vicinity of the periphery of the main rotor 102. Optionally, the first spray bar 61 is disposed at the rear side of the body 101, which is beneficial for the plant protection helicopter to keep balance. The second spray bar 62 has an arc-shaped structure symmetrical with respect to the central axis of the fuselage 101, and the front end of the second spray bar 62 can extend in the second direction to the vicinity of the outer periphery of the main rotor 102 on the front side of the fuselage 101. The second direction is perpendicular to the first direction. Further, the second spray bar 62 is disposed across the entire body 101 in a first direction. Optionally. A plurality of spray heads 3 are provided on the first spray bar 61 and the second spray bar 62.

Since the downwash airflow field of the main rotor 102 is weak directly below and near the fuselage 101 and strong in the region near the periphery of the main rotor 102, it can be considered that the entire downwash airflow field is centered on the fuselage 101 and has a stronger downwash airflow field closer to the periphery of the main rotor 102. Extending the first spray bars 61 near the periphery of the main rotor 102 thus allows the droplets to be sprayed as evenly as possible onto the front and back of the crop blades with the assistance of a strong downwash flow field near the periphery of the main rotor 102. For the area right below the main body 101 and the area near the main body 101, referring to fig. 8, since the second spraying rod 62 extends to the front side of the main body 101 to the vicinity of the periphery of the main rotor 102, under the assistance of the strong downwash airflow field at this position, the crop branches and leaves in the area right below the main body 101 and the area near the main body are turned over, so that the fog drops can be sprayed to the front and back of the crop leaves, and the crop in the area right below the main body 101 and the area near the main body can be sufficiently sprayed.

Optionally, second spray bar 62 is a semi-circular arc structure. Further alternatively, both free ends of the second spray bar 62 are connected to the first spray bar 61, respectively, so that the spray bar assembly 6 is one piece. During specific implementation, the arc structure of the second spray bar 62 is not limited to a semi-arc structure, and the arc structure of the second spray bar 62 can be matched with the intensity distribution of the lower washing airflow field of the main rotor 101, i.e. the spray heads 3 on the second spray bar 62 are all located below the stronger area of the lower washing airflow field as much as possible, so that the airflow effect of the lower washing airflow field can be conveniently and fully sprayed. Further, in order to enhance the stability of the second spray bar 62 on the plant protection helicopter 10, the second spray bar 62 is fixedly connected with the first spray bar 61 through a support bar structure. The support rod structure includes a first support rod 63 and a second support rod 64, wherein the first support rod 63 is used for connecting the first spray rod 61 and the second spray rod 62, and the second support rod 64 is used for connecting the first support rod 63 and the second spray rod 62. Optionally, the second support rod 64 and the first spraying rod 61 are parallel to each other and arranged at intervals, and the second support rod 64 and the first spraying rod 61 are perpendicular to each other, so that the support stability is improved. Optionally, the first support bar 63 and the second support bar 64 may also be provided with a spray head 3 according to the spraying requirement, so as to further improve the spraying strength under the machine body 101 and near the machine body, and ensure the spraying effect of crops under the machine body 101 and near the machine body.

In addition, the combination of the spray rod assembly 6 in this embodiment and the spray head 3 provided in the first embodiment can ensure that the front and the back of the blade at the middle and lower part of the canopy of the crop are fully sprayed, thereby further improving the spraying effect.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A spray head, comprising:

a housing (31);

one end of the hose (32) extends into the shell (31), and the other end of the hose (32) extends out of the shell (31) and is connected with a nozzle (33);

a rotating shaft (34) rotatably provided in the housing (31);

a first drive mechanism (35) configured to drive the hose (32) to be wound on the rotary shaft (34) or to be released from the rotary shaft (34).

2. Spray head according to claim 1, characterized in that said first driving mechanism (35) comprises a first motor (351), a driving member and a driven member arranged in parallel and spaced apart, said hose (32) being interposed between said driving member and said driven member; an output shaft of the first motor (351) drives the driving part to rotate, and then the hose (32) is driven to be wound on the rotating shaft (34) or released from the rotating shaft (34).

3. Spray head according to claim 2, characterized in that it further comprises a tensioning member (37), said tensioning member (37) being configured to give the hose (32) a tendency to wind up on the rotation shaft (34) at all times.

4. A sprayhead according to claim 3, wherein the tension element (37) is a spiral spring (371), the central axis of the spiral spring (371) coinciding with the central axis of the rotary shaft (34);

the scroll spring (371) generates a torque in a plane perpendicular to the central axis of the rotating shaft (34), which causes the hose (32) to always have a tendency to wrap around the rotating shaft (34).

5. The spray head of claim 4, wherein said wrap spring (371) has a first end disposed centrally and a second end disposed remotely therefrom; the first end of the scroll spring (371) is connected with the rotating shaft (34), and the second end of the scroll spring (371) is connected with the housing (31).

6. The head as claimed in claim 2, wherein the driving member is a driving roller shaft (352), the driven member is a driven roller shaft (353), and center line axes of the output shaft of the first motor (351), the driving roller shaft (352), and the driven roller shaft (353) are parallel to a center line axis of the rotation shaft (34).

7. Spray head according to claim 1, characterized in that the rotating shaft (34) is of hollow construction, the end of the hose (32) not connected to the nozzle (33) communicating with the rotating shaft (34).

8. Spray head according to claim 1, further comprising a second drive mechanism (38), the second drive mechanism (38) comprising a second motor and a guide wheel (381); the guide wheel (381) is in sliding fit with the spraying rod, and the second motor drives the guide wheel (381) to rotate, so that the spray head is driven to slide on the spraying rod.

9. A spray bar assembly for a plant protection helicopter (10), comprising a first spray bar (61) and a second spray bar (62), each of said first spray bar (61) and said second spray bar (62) having a plurality of spray heads according to any one of claims 1 to 8;

the first spray rod (61) is of a linear structure and extends to the two sides of the fuselage (101) to the periphery of the main rotor wing (102);

the second spraying rod (62) is of an arc-shaped structure which is symmetrical relative to the central axis of the machine body (101); the front end of the second spray bar (62) can extend towards the front side of the fuselage (101) to the vicinity of the periphery of the main rotor (102).

10. The spray bar assembly of claim 9, wherein said second spray bar (62) is a semi-circular arc structure; the free end of the second spray bar (62) is connected to the first spray bar (61).

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