Agricultural unmanned aerial vehicle seeding and discharging device

Abstract

The utility model provides an agricultural unmanned plane seeding and discharging device relates to agricultural unmanned plane technical field, include: mounting support, mounting support sets up on unmanned plane, storage tank, storage tank sets up on mounting support and opens storage cavity, stirring mechanism, stirring mechanism sets up in storage cavity and along storage cavity center axis distribution, discharging channel, discharging channel detachably sets up on storage tank and communicates with storage cavity, discharging adjustment subassembly, discharging adjustment subassembly sets up in discharging channel and is used for controlling the number when discharging, auxiliary discharging subassembly, auxiliary discharging subassembly sets up on discharging channel, wherein, discharging adjustment subassembly is used for adjusting seed falling rate, and auxiliary discharging subassembly forms high -speed discharge channel at the discharge port of discharging channel and makes the seed that falls through fast.

Description

Technical Field

[0001] This utility model relates to the field of agricultural drone technology, and in particular to an agricultural drone seeding and feeding device. Background Technology

[0002] With the development of agricultural modernization, agricultural drones have been widely used in seeding operations. Most existing agricultural drone seeding and dispensing devices use a simple gravity-feeding method, dropping seeds directly through an opening at the bottom of the feed hopper. This method has several problems. For example, when the drone's flight speed and altitude change, the seed's falling speed and spacing are difficult to control due to wind influence, easily leading to uneven sowing. Furthermore, different types of seeds vary greatly in shape, size, and weight, making it difficult for existing devices to adapt to the dispensing needs of seeds of various sizes. Summary of the Invention

[0003] The purpose of this invention is to provide an agricultural drone seeding and feeding device that solves the problem of uneven seeding when the speed and altitude of the existing drone seeding device change, and its inability to be used for seeding different types of seeds.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An agricultural drone seeding and feeding device includes: Mounting bracket, which is mounted on the drone; A storage bin, wherein the storage bin is mounted on the mounting bracket and has a storage cavity; A stirring mechanism is disposed in the storage chamber and distributed along the central axis of the storage chamber; A material feeding channel, which is detachably mounted on the storage box and communicates with the storage cavity; A feeding adjustment component is disposed in the feeding channel and is used to control the quantity of material being fed; An auxiliary feeding component is disposed on the feeding channel; The feeding adjustment component is used to adjust the number of seeds falling, and the auxiliary feeding component forms a high-speed discharge channel at the discharge port of the feeding channel, so that the falling seeds pass through quickly and gain acceleration.

[0005] According to the agricultural drone seeding and feeding device provided by this utility model, the storage box includes: A storage hopper, wherein the storage hopper is mounted on the mounting bracket; A sealing cover, wherein the sealing cover is disposed on the storage hopper; The bottom of the storage hopper contracts to form a discharge port, and the side of the sealing cover is designed to open and close with the storage hopper.

[0006] According to the agricultural drone seeding and feeding device provided by this utility model, the mixing mechanism includes: A drive motor is mounted on the sealing cover and coincides with the vertical center of the storage hopper; A stirring shaft is disposed at the drive end of the drive motor and extends to the discharge port of the storage hopper; The stirring blades are evenly arranged on the stirring shaft and extend radially into the storage cavity.

[0007] According to the agricultural drone seeding and feeding device provided by this utility model, the feeding channel includes: A feeding pipe, which is detachably installed at the outlet of the storage box; The discharge pipe is integrally formed and disposed on the feed pipe; The discharge pipe has a conical structure to gather the falling seeds.

[0008] According to the agricultural drone seeding and feeding device provided by this utility model, the feeding adjustment component includes: A fixing plate is disposed in the material feeding channel and has a material discharge port extending through it; A seed control board, which is detachably installed in the feeding channel and overlaps with the fixing plate; The seed control board is located at one end of the fixed plate near the storage box.

[0009] According to the agricultural drone seeding and feeding device provided by this utility model, the seed control board includes: A circular seed filter plate, wherein a circular hole is formed on the surface of the circular seed filter plate; An irregularly shaped seed filter plate, wherein irregularly shaped holes are formed on the surface of the irregularly shaped seed filter plate.

[0010] According to the agricultural drone seeding and feeding device provided by this utility model, the auxiliary feeding component includes: An annular airbag is disposed on the outer periphery of the feeding channel; An air nozzle is connected to the inner wall of the annular airbag and extends through into the feeding channel; An air pump is provided, which is mounted on the mounting bracket and connected to the annular airbag via an air supply pipe.

[0011] According to the agricultural drone seeding and feeding device provided by this utility model: multiple jet nozzles are distributed along a circular array in the annular airbag, and the jet head of each jet nozzle is inclined downward.

[0012] In summary, the beneficial technical effects of this utility model are as follows: The seeding device is installed on the bottom of the drone using the mounting bracket. Seeds are added to the storage bin, and a suitable seed feeding adjustment component is installed in the feeding channel. The added seeds are stirred by the stirring mechanism to make the seeds more evenly mixed before entering the feeding channel. The seed feeding adjustment component in the feeding channel blocks the seeds, allowing them to fall one by one, thus making the number and speed of the falling seeds more uniform. At the same time, the auxiliary feeding component is opened, forming a high-speed discharge channel at the outlet of the feeding channel. The falling seeds are accelerated by the high-speed discharge channel and fall vertically, making the sowing point more accurate and the sowing more uniform.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the bottom structure of an embodiment of the present invention; Figure 3 This is an overall cross-sectional view of an embodiment of the present utility model; Figure 4 This is an overall sectional plan view of an embodiment of the present utility model; Figure 5 yes Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the circular seed filter structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the irregularly shaped seed sprue structure according to an embodiment of the present invention.

[0016] Figure label: 10. Install the bracket; 20. Storage bin; 21. Storage hopper; 22. Sealing cover; 30. Stirring mechanism; 31. Drive motor; 32. Stirring shaft; 33. Stirring blades; 40. Feeding channel; 41. Feeding pipe; 42. Discharge pipe; 50. Feeding adjustment assembly; 51. Fixing plate; 52. Seed control plate; 521. Circular seed stencil; 522. Irregularly shaped seed stencil; 60. Auxiliary feeding assembly; 61. Annular airbag; 62. Air nozzle; 63. Inflation pump. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] In the description of the embodiments of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0020] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0022] The following is combined with Figures 1-7 The embodiments shown illustrate the technical solution of this utility model: An agricultural drone seeding and feeding device includes: a mounting bracket 10 mounted on a drone; a storage tank 20 mounted on the mounting bracket 10 and having a storage cavity; a stirring mechanism 30 disposed in the storage cavity and distributed along the central axis of the storage cavity; a feeding channel 40 detachably mounted on the storage tank 20 and communicating with the storage cavity; a feeding adjustment component 50 disposed in the feeding channel 40 and used to control the amount of seeds fed; and an auxiliary feeding component 60 disposed on the feeding channel 40. The feeding adjustment component 50 adjusts the amount of seeds falling, and the auxiliary feeding component 60 forms a high-speed discharge channel at the outlet of the feeding channel 40, allowing the falling seeds to pass through quickly and gain acceleration.

[0023] It is understood that: the mounting bracket 10 is a mounting frame formed by welding metal rods, which is then installed on the bottom of the drone. The storage box 20 has a conical structure and is transparent on all four sides. Metal strips are welded to the mounting bracket 10 around the surface of the storage box 20, thus connecting the storage box 20 and the mounting bracket 10 together. A stirring mechanism 30 is installed through the storage box 20 along its central axis. The stirring mechanism 30 mixes the added seeds, making the seed mixture more uniform and reducing clumping. A discharge channel 40 is detachably connected to the discharge port at the bottom of the storage box 20, connecting the discharge channel 40 to the storage box 20. The material chamber is connected, allowing seeds entering the storage bin 20 to enter the feeding channel 40 from the outlet. A feeding adjustment component 50 is installed in the feeding channel 40 to control the number and speed of falling seeds, making the seeds fall more evenly. Secondly, an auxiliary feeding component 60 is installed at the bottom outlet of the feeding channel 40. The auxiliary feeding component 60 provides an acceleration to the seeds when they fall into the outlet of the feeding channel 40, allowing the seeds to fall in a straight line. This avoids deviation of the seeds due to the influence of height or speed, thus making the sowing more accurate and even.

[0024] The agricultural drone seeding and feeding device provided in this embodiment of the utility model is installed at the bottom of the drone via a mounting bracket 10. Seeds to be sown are added to the storage box 20, and a feeding adjustment component 50 suitable for the seeds is installed in the feeding channel 40. The added seeds are stirred by the stirring mechanism 30 to make the seeds more evenly mixed before entering the feeding channel 40. The feeding adjustment component 50 in the feeding channel 40 blocks the seeds, allowing them to fall one by one, thus making the number and speed of the falling seeds more uniform. At the same time, the auxiliary feeding component 60 is opened, forming a high-speed discharge channel at the outlet of the feeding channel 40. The falling seeds are accelerated by the high-speed discharge channel and fall vertically, making the sowing point more accurate and the sowing more uniform.

[0025] According to the agricultural drone seeding and feeding device provided in this embodiment of the present utility model, the storage box 20 includes a storage hopper 21, which is mounted on the mounting bracket 10; and a sealing cover 22, which is mounted on the storage hopper 21; wherein, the bottom of the storage hopper 21 is contracted to form a discharge port, and the side of the sealing cover 22 is open and closed with the storage hopper 21.

[0026] Figure 1 and Figure 2An agricultural drone seeding and feeding device was implemented. The storage box 20 is formed by combining a storage hopper 21 and a sealing cover 22. The storage hopper 21 has a conical structure that narrows at the bottom to form a discharge port. The sealing cover 22 is fixedly mounted on the storage hopper 21, and one third of the sealing cover 22 can be opened. Figure 1 As shown, the remaining parts are sealed to the storage hopper 21, so that the seeds will not spill out of the storage hopper 21 during the sowing process, thus providing better protection for the seeds, and the opening and closing parts are connected by hinges.

[0027] According to the agricultural drone seeding and feeding device provided in this embodiment of the present invention, the mixing mechanism 30 includes a drive motor 31, which is mounted on the sealing cover 22 and coincides with the vertical center of the storage hopper 21; a mixing shaft 32, which is mounted on the drive end of the drive motor 31 and extends to the discharge port of the storage hopper 21; and mixing blades 33, which are evenly mounted on the mixing shaft 32 and extend radially into the storage cavity.

[0028] Figure 3 and Figure 4 An agricultural drone seeding and feeding device was implemented. The mixing mechanism 30 is composed of a drive motor 31, a mixing shaft 32, and mixing blades 33. The drive motor 31 is located in the middle of the sealing cover 22 of the storage hopper 21, coinciding with the center of the storage hopper 21 in the vertical direction. The mixing shaft 32 is connected to the drive end of the drive motor 31, extending vertically to the bottom outlet of the storage hopper 21. Simultaneously, the mixing blades 33 are evenly distributed on the mixing shaft 32, extending radially in the storage cavity. When the drive motor 31 drives the mixing shaft 32 to rotate, the mixing shaft 32 and the mixing blades 33 mix the seeds in the storage box 20, making the seed particles distinct and reducing clumping, thus facilitating seeding.

[0029] According to the agricultural drone seeding and feeding device provided in this embodiment of the present utility model, the feeding channel 40 includes a feeding pipe 41, which is detachably installed at the discharge port of the storage box 20; and a discharge pipe 42, which is integrally formed on the feeding pipe 41; wherein, the discharge pipe 42 has a conical structure to gather the falling seeds.

[0030] Figure 2 and Figure 3An agricultural drone seeding and feeding device was implemented. The feeding channel 40 is formed by the combination of the feeding pipe 41 and the discharge pipe 42. The feeding pipe 41 is threaded to the discharge port of the storage box 20. When not in use, the feeding pipe 41 can be easily disassembled. At the same time, the discharge pipe 42 is integrally formed at the bottom of the feeding pipe 41. The discharge pipe 42 is tapered to collect the falling seeds, so that it can better obtain a certain acceleration and keep the falling seeds vertical.

[0031] According to the agricultural drone seeding and feeding device provided in this embodiment of the present invention, the feeding adjustment component 50 includes a fixed plate 51, which is disposed in the feeding channel 40 and has a through-hole for feeding; a seed control plate 52, which is detachably disposed in the feeding channel 40 and overlaps with the fixed plate 51; wherein, the seed control plate 52 is disposed at one end of the fixed plate 51 near the storage box 20.

[0032] Figure 3 and Figure 4 An agricultural drone seeding and feeding device was implemented. The feeding component is formed by combining a fixed plate 51 and a seed control plate 52. The fixed plate 51 is set in the feeding channel 40 and has a feeding port through the middle, so that the fixed plate 51 is formed into a ring structure. The fixed plate 51 is fixedly connected to the feeding channel 40. At the same time, the seed control plate 52 is placed on the fixed plate 51 in the feeding channel 40. The fixed plate 51 supports the seed control plate 52, thereby making the seed control plate 52 more stable in the feeding channel 40, that is, controlling the number of falling seeds and making the number of falling seeds more uniform.

[0033] According to the agricultural drone seeding and feeding device provided in this embodiment of the present invention, the seed control plate 52 includes a circular seed sluice plate 521 with a circular hole on its surface; and an irregularly shaped seed sluice plate 522 with an irregularly shaped hole on its surface.

[0034] Figure 6 and Figure 7An agricultural drone seeding and feeding device is implemented. The seed control plate 52 can be divided into a circular seed sluice plate 521 and an irregular seed sluice plate. Different seed sluice plates can be selected according to different seed shapes, so that the seeds can fall more effectively and the number of seeds falling each time is basically the same. Specifically, when the seeds are circular, the circular seed sluice plate 521 is selected. The circular seed sluice plate 521 is placed on the fixed plate 51, and the feeding channel 40 is threaded to the discharge port of the storage box 20. After adding the seeds, they fall into the circular seed sluice plate 521 under the action of stirring and gravity. The seeds fall through the seed falling holes on the circular seed sluice plate 521, and the number of seeds falling each time is the same, thus better controlling the number of seeds falling and making the sowing more uniform. When the seeds are irregular, the irregular seed sluice plate is selected, and the above operation is repeated. It is hereby declared that the seed sluice plate of this application is not limited to the above two types, and can also be other shapes. The above is only an example to illustrate the specific usage and does not limit its type.

[0035] According to the agricultural drone seeding and feeding device provided in this embodiment of the present invention, the auxiliary feeding component 60 includes an annular airbag 61, which is disposed on the outer periphery of the feeding channel 40; a jet nozzle 62, which is connected to the inner wall of the annular airbag 61 and extends through into the feeding channel 40; and an air pump 63, which is disposed on the mounting bracket 10 and is connected to the annular airbag 61 by an air supply pipe.

[0036] Figure 2 and Figure 3 An agricultural drone seeding and feeding device was implemented. The auxiliary feeding component 60 is formed by combining an annular airbag 61, a nozzle 62, and an air pump 63. The annular airbag 61 is fixedly sleeved on the outer periphery of the bottom of the feeding channel 40, while the nozzle 62 is fixedly set on the inner side of the annular airbag 61. When the annular airbag 61 is sleeved on the bottom of the feeding channel 40, the nozzle 62 penetrates the bottom of the feeding channel 40, extends into the interior of the feeding channel 40, and communicates with the feeding channel 40. The air pump 63 is set on the mounting bracket 10, and the air pump 63 is connected to the air supply pipe. The annular airbag 61 is connected, and then the air pump 63 inflates the annular airbag 61, increasing the air pressure in the annular airbag 61. The air pressure is then ejected from the nozzle 62, and the ejected air pressure is discharged from the discharge port of the feeding channel 40. The high pressure creates a high-speed channel at the discharge port of the feeding channel 40, allowing the seeds passing through this channel to obtain a high-speed acceleration. This allows the seeds to fall vertically during the descent, reducing the influence of height, speed, or wind force, and making sowing more accurate and uniform.

[0037] According to the agricultural drone seeding and feeding device provided in this embodiment of the present invention, multiple jet nozzles 62 are distributed along a circular array on the annular airbag 61, and the jet head of each jet nozzle 62 is tilted downward.

[0038] Figure 4 and Figure 5 An agricultural drone seeding and feeding device was implemented. The nozzles 62 are arranged in a circular array along the annular airbag 61, and the nozzles of each nozzle 62 are inclined downwards, so that the nozzles 62 can concentrate downwards when spraying, thereby better forming a downward airflow channel to accelerate the processing of the falling seeds, thus making the seeding more accurate and uniform.

[0039] Usage process: In use, the mounting bracket 10 is threaded onto the bottom of the drone. The mounting bracket 10 and the storage tank 20 are welded together. After connecting the mounting bracket 10 to the drone, the storage tank 20 is also mounted on the drone. Next, the feeding channel 40 is threaded into the discharge port of the storage tank 20, so that the feeding channel 40 is vertically downward and perpendicular to the drone. Thus, when the drone takes off, the feeding channel 40 is perpendicular to the ground. After installing the feeding channel 40, the air pump 63 is threaded onto the mounting bracket 10. After the entire device is installed, the seeds to be sown are added to the storage tank 20, thereby activating the stirring mechanism 30. The stirring mechanism 30 stirs the seeds added to the storage tank 20, separating the seeds from each other, thereby reducing the occurrence of clumping and making the seeds more distinct. During the stirring process, the seeds enter the feeding channel through the discharge port. In channel 40, the seed control board 52 controls the number of seeds falling, ensuring that the number falling each time is basically the same. At the same time, an annular airbag 61 and a jet nozzle 62 are set above the discharge pipe 42 at the bottom of the feeding channel 40. The air pump 63 inflates the annular airbag 61, increasing the air pressure in the annular airbag 61, and then the air pressure is discharged from the jet nozzle 62. The discharged air pressure forms a high-pressure flow channel at the discharge port of the feeding channel 40, which accelerates the falling seeds as they pass through the high-pressure flow channel. This allows the seeds to obtain a higher acceleration when they come out of the discharge pipe 42 of the feeding channel 40, enabling the seeds to fall vertically and quickly to the designated location. This avoids the problem of inaccurate seed sowing position and uneven sowing caused by the altitude, speed or wind speed of the drone.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An agricultural drone seeding and feeding device, characterized in that, include: Mounting bracket (10), which is mounted on the drone; Storage box (20), the storage box (20) is mounted on the mounting bracket (10) and has a storage cavity; A stirring mechanism (30) is provided in the storage chamber and distributed along the central axis of the storage chamber; The material discharge channel (40) is detachably mounted on the storage box (20) and communicates with the storage cavity; A feeding adjustment component (50) is disposed in the feeding channel (40) and used to control the quantity of material being fed. An auxiliary feeding assembly (60) is disposed on the feeding channel (40); The feeding adjustment component (50) is used to adjust the number of seeds falling, and the auxiliary feeding component (60) forms a high-speed discharge channel at the discharge port of the feeding channel (40) so that the falling seeds pass through quickly and gain acceleration.

2. The agricultural drone seeding and feeding device according to claim 1, characterized in that, The storage bin (20) includes: Storage hopper (21), the storage hopper (21) is disposed on the mounting bracket (10); A sealing cap (22) is provided on the storage hopper (21); The bottom of the storage hopper (21) contracts to form a discharge port, and the side of the sealing cover (22) is open and closed with the storage hopper (21).

3. The agricultural drone seeding and feeding device according to claim 2, characterized in that, The stirring mechanism (30) includes: A drive motor (31) is mounted on the sealing cover (22) and coincides with the vertical center of the storage hopper (21); A stirring shaft (32) is disposed at the drive end of the drive motor (31) and extends to the discharge port of the storage hopper (21); The stirring blades (33) are evenly arranged on the stirring shaft (32) and extend radially into the storage chamber.

4. The agricultural drone seeding and feeding device according to claim 1, characterized in that, The feeding channel (40) includes: The feeding pipe (41) is detachably installed at the outlet of the storage box (20); The discharge pipe (42) is integrally formed on the feed pipe (41); The discharge pipe (42) has a conical structure to gather the falling seeds.

5. The agricultural drone seeding and feeding device according to claim 1, characterized in that, The feeding adjustment component (50) includes: A fixing plate (51) is provided in the feeding channel (40) and has a feeding port through it; Seed control board (52), which is detachably installed in the feeding channel (40) and overlaps with the fixing plate (51); The seed control board (52) is located at one end of the fixed plate (51) near the storage box (20).

6. The agricultural drone seeding and feeding device according to claim 5, characterized in that, The seed control panel (52) includes: A circular seed filter plate (521) has circular holes on its surface; An irregularly shaped seed sprue (522) has irregularly shaped holes on its surface.

7. The agricultural drone seeding and feeding device according to claim 1, characterized in that, The auxiliary feeding assembly (60) includes: An annular airbag (61) is disposed on the outer periphery of the feeding channel (40); The nozzle (62) is connected to the inner wall of the annular airbag (61) and extends through into the feeding channel (40); An air pump (63) is provided on the mounting bracket (10) and an air supply pipe is provided to connect to the annular airbag (61).

8. The agricultural drone seeding and feeding device according to claim 7, characterized in that, Multiple jet nozzles (62) are distributed along a circular array on the annular airbag (61), and the jet head of each jet nozzle (62) is tilted downward.

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