Intelligent pest and disease damage collection device and system based on mobile phone photographing recognition

Abstract

The invention discloses an intelligent pest and disease damage collection device and system based on mobile phone photographing recognition, and belongs to the technical field of intelligent pest and disease damage collection, the intelligent pest and disease damage collection device comprises a placement plate, a mobile phone fixing module, a leaf placement module, a supporting and adjusting module and a light supplementing and control module, and the interior of the placement plate is hinged to a supporting piece through a 270-degree storage hinge. The intelligent pest and disease damage collection device and system based on mobile phone photographing recognition solve the problems that professional heavy equipment is difficult to move in complex terrains and cannot collect disease damage in time in the disease damage source position in the using process, can be rapidly unfolded and used in the field edge, ensure that disease damage images are collected in the first time, guarantee recognition timeliness and improve the disease damage collection efficiency. According to the method, monitoring delay caused by equipment limitation is avoided, manual operation differences of shooting angles, object distances, backgrounds and leaf forms are eliminated, high standardization of images in view angle, definition, background consistency and the like is ensured, stable input is provided for rear-end applet recognition, and the recognition accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent pest and disease collection technology, specifically to an intelligent pest and disease collection device and system based on mobile phone photo recognition. Background Technology

[0002] Pests and diseases can seriously threaten crop growth, thus requiring efficient prevention and control. In pest and disease control, the first step is intelligent sample collection. Intelligent collection accurately identifies the types and severity of pests and diseases, allowing for the matching of appropriate treatment plans and contributing to the development of green agriculture. Intelligent pest and disease collection requires the use of intelligent collection devices, such as the Chinese patent application with application number 202111622531.0 and application date of 2021-12-28, which describes a deep learning-based method for identifying tomato leaf diseases. In this method, users simply take photos of the leaves with their mobile phones. The shooting parameters (distance, angle, lighting, background) rely entirely on user operation, resulting in inconsistent image quality, low and unstable recognition accuracy, poor performance in low light, and easy blurring due to hand-held shaking. Furthermore, it is difficult to fix leaves securely. There is also a Chinese patent application with application number 202011226456.1 and application date of 2020-11-04, which describes a mobile phone holder for OCR text recognition. While designed to hold flat paper, it cannot hold irregularly shaped targets, such as curled leaves, and is not adaptable to the physical characteristics of different subjects, exhibiting low target compatibility. Additionally, the base relies on tabletop support, making it unsuitable for handheld or mounted use in fields. Furthermore, it lacks supplemental lighting, making it unsuitable for low-light environments and exhibiting poor overall environmental compatibility, thus failing to cope with complex field operating conditions. In addition, there is a Chinese patent application with application number 202221597752.7 and application date of 2022-06-24, which describes a leaf disease identification device. In use, it provides a heavy-duty mobile identification device that is quite bulky. Although it is equipped with casters at the bottom, it is still inconvenient to operate in complex terrains, such as in tea plantations. At the same time, due to its bulky size, it cannot be used at the original location of the disease, and the timeliness of disease identification cannot be guaranteed. Changes in the detection environment will affect the accuracy of disease identification.

[0003] In the process of intelligent sample collection for pests and diseases, staff need to keep moving around the collection site, which requires a portable collection device. However, the device in the above-mentioned application is inconvenient to carry and has low work efficiency. In addition, the shooting effect is poor in low light environment. Furthermore, the device in the above-mentioned application does not have an auxiliary shooting structure, resulting in inaccurate collection results. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent pest and disease collection device and system based on mobile phone photo recognition, so as to solve the problems mentioned in the background art, such as inconvenience in use, low work efficiency, and lack of auxiliary shooting structure, which leads to inaccurate collection results.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a smart pest and disease collection device and system based on mobile phone photo recognition, comprising a placement plate, a mobile phone fixing module, a leaf placement module, a support and adjustment module, and a supplementary lighting and control module. The placement plate has a support plate hinged internally via a 270° hinge, and the support plate is hinged to an auxiliary plate via a 90° hinge. A spring clip is movably disposed internally within the auxiliary plate. A slide rail is provided on the side of the placement plate, and a leaf clip is disposed internally within the slide rail. A handgrip is fixedly connected to the surface of the auxiliary plate, and a power cord interface is provided at the end of the handgrip. A supplementary light and a PWM lighting drive module are disposed on the lower surface of the handgrip. A brightness adjustment knob is provided on the side of the handgrip. A push rod is connected to the surface of the auxiliary plate via a lifting mechanism. An airbag is fixedly connected to the upper surface of the handgrip, and an upper connecting plate is fixedly connected to the upper surface of the handgrip. A nozzle is disposed on the surface of the upper connecting plate.

[0006] Preferably, the mobile phone fixing module includes the auxiliary plate, the spring clip, and the hand grip. The mobile phone fixing module adopts a dual-sided differentiated clamping design, with an adaptive spring mechanism on the elastic side and an anti-slip positioning structure integrated on the rigid side. The contact surface with the mobile phone is covered with a flexible buffer layer to achieve stable installation of mobile phones of various sizes. The bottom extends with an ergonomic hand grip to ensure balance when holding the phone with one hand.

[0007] Preferably, the leaf placement module includes a PVC frosted material placement plate, leaf clamps, slide rails, and a multi-degree-of-freedom adjustable clamp system. The surface of the placement plate is frosted to eliminate specular reflection and form a uniform background. Two sets of leaf clamps with the same width as the placement plate are moved left and right in the plane through slide rails on the upper and lower sides, respectively, to firmly constrain leaves with complex shapes such as curls and wrinkles, while avoiding damage to plant tissue, and at the same time keeping the target area fully exposed to the shooting field of view.

[0008] Preferably, the support and adjustment module includes a power cord interface, a brightness adjustment knob, a fill light, and a PWM lighting driver module. The fill light and the PWM lighting driver module are located on the back of the mobile phone fixing module and use low-power LED lights, which are directly powered by the mobile phone. The power cord is a universal cable with Micro-USB, USB-C and Lightning interfaces.

[0009] Preferably, the handgrip adopts a hollow cavity structure, the PWM lighting drive module drive circuit is located inside the handgrip, and a USB-C interface is integrated at the bottom of the handgrip for connecting the mobile phone and the fill light. Users can choose according to their own mobile phone model.

[0010] Preferably, the lower surface of the placement plate has a storage groove that fits into the support piece, forming a compact structure after folding, thus achieving ultra-thin storage.

[0011] Preferably, a circular plate is rotatably provided inside both the auxiliary plate and the spring clip. The lifting mechanism includes a fixed plate fixedly connected to the surface of the auxiliary plate, and a rotating shaft is rotatably provided inside the fixed plate. An external plate is fixedly connected to the end of the rotating shaft, and a protrusion is fixedly connected to the end of the external plate.

[0012] Preferably, a movable frame is sleeved on the surface of the protrusion, and a push rod is fixedly connected to the upper surface of the movable frame. An inner plate is fixedly connected inside the push rod, and the push rods are symmetrically distributed on both sides of the inner plate.

[0013] Preferably, a limiting rod is fixedly connected to the surface of the auxiliary plate, and the inner plate is slidably disposed on the surface of the limiting rod, and the surface of the limiting rod is convex.

[0014] Preferably, an extrusion plate is fixedly connected to the outer wall of the inner plate, and the lower surface of the extrusion plate is in contact with the upper surface of the airbag. A side tube is fixedly connected to the side of the airbag, and an outer tube is fixedly connected to the surface of the airbag. A one-way valve is fixedly connected to the surface of both the outer tube and the side tube. The outer tube is connected to the upper plate through an external flexible hose, and the upper plate supplies air to the nozzle.

[0015] Compared with the prior art, the beneficial effects of the present invention are: it adopts a novel structural design, the specific details of which are as follows:

[0016] (1) The intelligent pest and disease collection device and system based on mobile phone photo recognition can be quickly folded and stored during use through the folding structure. This solves the problem that professional heavy equipment is difficult to move in complex terrain and cannot collect data in time at the original location of the disease. It can be quickly deployed and used in the field to ensure that the disease image is collected as soon as possible, ensure the timeliness of recognition, avoid delays in monitoring due to equipment limitations, eliminate human operation differences in shooting angle, object distance, background, and leaf shape, and ensure that the image is highly standardized in terms of viewing angle, clarity, and background consistency. This provides stable input for the backend mini-program recognition and improves the recognition accuracy.

[0017] Furthermore, it addresses the issues of bulky and poor portability of specialized equipment. When folded, it is compact and lightweight, making it easy for agricultural producers to carry to fields, orchards, and other locations, reducing the burden of carrying it and adapting to complex operating conditions.

[0018] (2) The intelligent pest and disease collection device and system based on mobile phone photo recognition solves the problem of noise and blurry details in images taken in low light environment (cloudy day, evening, and when branches and leaves are blocked) by setting a brightness adjustment knob, a supplementary light, and a PWM lighting drive module. It is compatible with various mobile phones through multiple interfaces, ensuring clear imaging all day long and meeting the recognition requirements.

[0019] (3) When the mobile phone needs to be clamped, the spring clamp can be pulled to clamp the mobile phone into the auxiliary plate and the spring clamp. At this time, the mobile phone is held in place by the round plate. When the angle of the mobile phone needs to be adjusted, the rotating shaft can be rotated. When the rotating shaft rotates, it drives the outer plate and the protrusion to rotate. At this time, the movable frame cooperates with the push rod and the limit rod to drive the push rod to move in the vertical direction. At this time, the push rod will push the mobile phone to rotate, thereby adjusting the angle of the mobile phone, which facilitates the accuracy of photo archiving and improves the overall flexibility of the device.

[0020] (4) When the inner plate and push rod move vertically, the squeezing plate will intermittently squeeze the air bag. At this time, the air bag will supply air to the upper plate and nozzle through the outer tube, so that the nozzle can clean the dust on the surface of the hand grip and also play a role in cooling. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection structure between the placement plate and the hand grip of the present invention;

[0022] Figure 2 This is a schematic diagram of the connection structure between the placement plate and the blade clamp of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection structure between the auxiliary plate and the spring clip of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection structure between the auxiliary plate and the circular plate of the present invention;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the auxiliary plate of the present invention;

[0026] Figure 6 This is a schematic diagram of the connection structure between the auxiliary plate and the fixing plate of the present invention;

[0027] Figure 7 This is a schematic diagram of the connection structure between the rotating shaft and the outer plate of the present invention;

[0028] Figure 8 This is a schematic diagram of the working state structure of the active frame of the present invention;

[0029] Figure 9 This is a schematic diagram of the nozzle distribution structure of the present invention;

[0030] Figure 10 This is a flowchart of the working system of the present invention;

[0031] Figure 11 This is a flowchart illustrating the operation of the supplementary lighting and control module of the present invention.

[0032] In the diagram: 1. Placement plate; 2. Hand grip; 3. Power cord interface; 4. Support plate; 5. Auxiliary plate; 6. Spring clip; 7. Round plate; 8. Brightness adjustment knob; 9. Fill light; 10. PWM lighting driver module; 11. Leaf clip; 12. 270° storage hinge; 13. Storage slot; 14. Slide rail; 15. 90° hinge; 16. Fixing plate; 17. Limiting rod; 18. Upper connecting plate; 19. Airbag; 20. Rotating shaft; 21. External connecting plate; 22. Protrusion; 23. Movable frame; 24. Push rod; 25. Internal connecting plate; 26. Extrusion plate; 27. Nozzle; 28. Side tube; 29. ​​Outer tube. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The present invention provides the following technical solution: a smart pest and disease collection device and system based on mobile phone photo recognition.

[0035] Example 1: By incorporating a mobile phone fixing module, a blade placement module, a support and adjustment module, and a supplementary lighting and control module, the overall flexibility of the device is greatly improved, such as... Figures 1-6 As shown, the device includes a placement plate 1, a mobile phone fixing module, a blade placement module, a support and adjustment module, and a supplementary lighting and control module. The placement plate 1 is internally hinged to a support plate 4 via a 270° hinge 12, and the support plate 4 is hinged to an auxiliary plate 5 via a 90° hinge 15. A spring clip 6 is movably installed inside the auxiliary plate 5. A slide rail 14 is provided on the side of the placement plate 1, and a blade clip 11 is installed inside the slide rail 14. A handgrip 2 is fixedly connected to the surface of the auxiliary plate 5, and a power cord interface 3 is provided at the end of the handgrip 2. A supplementary light 9 and a PWM lighting drive module 10 are provided on the lower surface of the handgrip 2. A brightness adjustment knob 8 is provided on the side of the handgrip 2.

[0036] An airbag 19 is fixedly connected to the upper surface of the hand grip 2, and an upper connecting plate 18 is fixedly connected to the upper surface of the hand grip 2, and a nozzle 27 is provided on the surface of the upper connecting plate 18.

[0037] The mobile phone fixing module includes an auxiliary plate 5, a spring clip 6, and a hand grip 2. The mobile phone fixing module adopts a dual-sided differentiated clamping design. The elastic side is equipped with an adaptive spring mechanism, and the rigid side integrates an anti-slip positioning structure. The contact surface with the mobile phone is covered with a flexible buffer layer to achieve stable installation of mobile phones of various sizes. The bottom extends with an ergonomic hand grip 2 to ensure balance when holding the phone with one hand.

[0038] The leaf placement module includes a PVC frosted placement plate 1, leaf clips 11, slide rails 14, and a multi-degree-of-freedom adjustable clamping system. The surface of the placement plate 1 is frosted to eliminate specular reflection and form a uniform background. Two sets of leaf clips 11 with the same width as the placement plate 1 are moved left and right in the plane through the slide rails 14 on the upper and lower sides, respectively, to firmly constrain leaves with complex shapes such as curls and wrinkles, while avoiding damage to plant tissue, and at the same time keeping the target area fully exposed to the shooting field of view.

[0039] The support and adjustment module includes a power cord interface 3, a brightness adjustment knob 8, a fill light 9, and a PWM lighting driver module 10. The fill light 9 and the PWM lighting driver module 10 are located on the back of the mobile phone fixing module and use low-power LED lights, which are directly powered by the mobile phone. The power cord is a universal cable with Micro-USB, USB-C and Lightning interfaces.

[0040] The handgrip 2 adopts a hollow cavity structure. The PWM lighting drive module 10 drive circuit is located inside the handgrip 2. The bottom of the handgrip 2 integrates a USB-C interface for connecting the mobile phone and the fill light 9. Users can choose according to their own mobile phone model. The lower surface of the placement plate 1 has a storage groove 13, which fits with the support plate 4. After folding, it forms a compact structure and achieves ultra-thin storage.

[0041] When using the device, unfold it and rotate the blade placement module counterclockwise to extend the 270° storage hinge 12 of the support and adjustment module to its maximum. Then, rotate the phone fixing module counterclockwise to extend the 90° hinge 15 to its maximum. Place the blade to be tested on the placement plate 1 and fix it with the blade clamp 11. Then, fix the phone with the spring clamp 6, open the phone camera, and confirm that the blade is in the viewfinder area. If the phone camera fails to autofocus on the affected area, manually focus it. After confirming focus, click to take a picture. If the ambient light is too low and a clear picture cannot be taken, you need to turn on the supplementary light. Select a suitable power cord, insert one end into the power cord interface 3 at the end of the handgrip 2, and connect the other end to the phone charging port. At this time, the supplementary light 9 is powered on, and the PWM lighting drive module 10 works. Adjust the brightness adjustment knob 8 on the side of the handgrip 2 until the phone camera can form a clear image. Then repeat the above steps to take a picture.

[0042] Images are uploaded to a recognition mini-program for identification using a locally deployed algorithm, or uploaded to a cloud server for identification via the mini-program. Once identification is complete, the results and prevention measures are output in the mini-program.

[0043] Example 2: Unlike Example 1, the angle of the phone can be quickly adjusted using the push rod 24, such as... Figures 1-8 As shown, the surface of the auxiliary plate 5 is connected to a push rod 24 via a lifting mechanism; a circular plate 7 is rotatably arranged inside the auxiliary plate 5 and inside the spring clip 6. The lifting mechanism includes a fixed plate 16 fixedly connected to the surface of the auxiliary plate 5, and a rotating shaft 20 is rotatably arranged inside the fixed plate 16. An external plate 21 is fixedly connected to the end of the rotating shaft 20, and a protrusion 22 is fixedly connected to the end of the external plate 21.

[0044] The surface of the protrusion 22 is fitted with a movable frame 23, and the upper surface of the movable frame 23 is fixedly connected with a push rod 24. The inside of the push rod 24 is fixedly connected with an inner plate 25, and the push rod 24 is symmetrically distributed on both sides of the inner plate 25. The surface of the auxiliary plate 5 is fixedly connected with a limit rod 17, and the surface of the limit rod 17 is slidably provided with the inner plate 25. The surface of the limit rod 17 is protruding.

[0045] When it is necessary to hold the phone, the spring clip 6 can be pulled to clamp the phone into the auxiliary plate 5 and the spring clip 6. At this time, the phone is held in place by the circular plate 7. When it is necessary to adjust the angle of the phone, the rotating shaft 20 can be rotated. When the rotating shaft 20 rotates, it drives the outer plate 21 and the protrusion 22 to rotate. At this time, the movable frame 23 cooperates with the push rod 24 and the limiting rod 17 to drive the push rod 24 to move in the vertical direction. At this time, the push rod 24 will push the phone to rotate, thereby adjusting the angle of the phone, which facilitates the accuracy of taking pictures for archiving and improves the overall flexibility of the device.

[0046] Example 3: Unlike Example 2, the airbag 19 and nozzle 27 can clean the surface of the handgrip 2 and cool it down. Figure 8 and Figure 9 As shown, an extrusion plate 26 is fixedly connected to the outer wall of the inner plate 25, and the lower surface of the extrusion plate 26 is in contact with the upper surface of the airbag 19. A side tube 28 is fixedly connected to the side of the airbag 19, and an outer tube 29 is fixedly connected to the surface of the airbag 19. A one-way valve is fixedly connected to both the surface of the outer tube 29 and the surface of the side tube 28. The outer tube 29 is connected to the upper plate 18 through an external hose, and the upper plate 18 supplies air to the nozzle 27.

[0047] When the inner plate 25 and the push rod 24 move vertically, the extrusion plate 26 intermittently extrudes the airbag 19. When the airbag 19 is extruded, it supplies air to the upper plate 18 through the outer tube 29. When the airbag 19 is not extruded, it takes in air through the side tube 28. At this time, the airbag 19 expands and intermittently supplies air to the nozzle 27, so that the nozzle 27 can clean the dust on the surface of the hand grip 2 and also has a cooling effect.

[0048] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart pest and disease collection device and system based on mobile phone photo recognition, comprising a placement plate (1), a mobile phone fixing module, a leaf placement module, a support and adjustment module, and a supplementary lighting and control module. The placement plate (1) is hinged to a support piece (4) through a 270° storage hinge (12), and the support piece (4) is hinged to an auxiliary plate (5) through a 90° hinge (15). A spring clip (6) is movably arranged inside the auxiliary plate (5). Its features are: The side of the placement plate (1) is provided with a slide rail (14), and the slide rail (14) is provided with a blade clamp (11). The auxiliary plate (5) is fixedly connected to a hand grip (2), and the end of the hand grip (2) is provided with a power cord interface (3), and the lower surface of the hand grip (2) is provided with a fill light (9), and the lower surface of the hand grip (2) is provided with a PWM lighting drive module (10). A brightness adjustment knob (8) is provided on the side of the hand grip (2); The surface of the auxiliary plate (5) is connected to a push rod (24) via a lifting mechanism. An airbag (19) is fixedly connected to the upper surface of the hand grip (2), and an upper connecting plate (18) is fixedly connected to the upper surface of the hand grip (2), and a nozzle (27) is provided on the surface of the upper connecting plate (18).

2. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 1, characterized in that: The mobile phone fixing module includes the auxiliary plate (5), the spring clip (6), and the hand grip (2). The mobile phone fixing module adopts a double-sided differentiated clamping design. The elastic side is equipped with an adaptive spring mechanism, and the rigid side integrates an anti-slip positioning structure. The contact surface with the mobile phone is covered with a flexible buffer layer to achieve stable installation of mobile phones of various sizes. The bottom extends with an ergonomic hand grip (2) to ensure balance when holding with one hand.

3. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 1, characterized in that: The leaf placement module includes a PVC frosted material placement plate (1), leaf clips (11), slide rails (14) and a multi-degree-of-freedom adjustable clamp system. The surface of the placement plate (1) is frosted to eliminate specular reflection and form a uniform background. Two sets of leaf clips (11) with the same width as the placement plate (1) are moved left and right in the plane through the slide rails (14) on the upper and lower sides respectively, which firmly restrains leaves with complex shapes such as curling and wrinkling, while avoiding damage to plant tissue, and at the same time keeping the target area fully exposed to the shooting field of view.

4. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 1, characterized in that: The support and adjustment module includes a power cord interface (3), a brightness adjustment knob (8), a fill light (9), and a PWM lighting drive module (10). The fill light (9) and the PWM lighting drive module (10) are located on the back of the mobile phone fixing module and use low-power LED lights, which are directly powered by the mobile phone. The power cord uses a universal cable with Micro-USB, USB-C and Lightning interfaces.

5. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 1, characterized in that: The handgrip (2) adopts a hollow cavity structure. The PWM lighting drive module (10) drive circuit is located inside the handgrip (2). The bottom of the handgrip (2) integrates a USB-C interface for connecting the mobile phone and the fill light (9). Users can choose according to their own mobile phone model.

6. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 1, characterized in that: The lower surface of the placement plate (1) is provided with a storage groove (13), which fits into the support plate (4). After folding, it forms a compact structure to achieve ultra-thin storage.

7. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 1, characterized in that: Both the interior of the auxiliary plate (5) and the interior of the spring clip (6) are rotatably provided with circular plates (7). The lifting mechanism includes a fixed plate (16) fixedly connected to the surface of the auxiliary plate (5), and a rotating shaft (20) is rotatably provided inside the fixed plate (16). An external plate (21) is fixedly connected to the end of the rotating shaft (20), and a protrusion (22) is fixedly connected to the end of the external plate (21).

8. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 7, characterized in that: The surface of the protrusion (22) is fitted with a movable frame (23), and the upper surface of the movable frame (23) is fixedly connected with a push rod (24), and the inside of the push rod (24) is fixedly connected with an inner plate (25), and the push rod (24) is symmetrically distributed on both sides of the inner plate (25).

9. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 8, characterized in that: The auxiliary plate (5) is fixedly connected to a limiting rod (17), and the inner plate (25) is slidably provided on the surface of the limiting rod (17), and the surface of the limiting rod (17) is convex.

10. The intelligent pest and disease collection device and system based on mobile phone photo recognition according to claim 8, characterized in that: An extrusion plate (26) is fixedly connected to the outer wall of the inner plate (25), and the lower surface of the extrusion plate (26) is in contact with the upper surface of the airbag (19). A side tube (28) is fixedly connected to the side of the airbag (19), and an outer tube (29) is fixedly connected to the surface of the airbag (19). A one-way valve is fixedly connected to both the surface of the outer tube (29) and the surface of the side tube (28). The outer tube (29) is connected to the upper plate (18) through an external hose. The upper plate (18) supplies air to the nozzle (27).

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