Cleaning and flaw detection device for blades of wind driven generator

Abstract

The invention discloses a wind driven generator blade cleaning flaw detection device, and relates to the field of blade flaw detection devices. A wind driven generator blade cleaning and flaw detecting device comprises a lifting rod and further comprises a fan blade mounting ring fixedly connected to the telescopic end of the lifting rod; the bottom mounting frame is arranged below the fan blade mounting ring, and two sets of clamping rings are connected into the bottom mounting frame; the industrial fan set is arranged on the opposite side of the lifting rod; according to the blade surface flaw detection device, the blade is blown, then airflow is guided to the two sides through the radian of the surface of the blade, at the moment, the strength and range of the guided airflow can be detected through displacement of the multiple sliding rods, the blade can be detected, whether dents, scratches or bends exist on the surface or not is judged, and flaw detection can be conveniently conducted on the surface of the blade.

Description

Technical Field

[0001] The invention belongs to the technical field of blade flaw detection devices, and in particular relates to a wind turbine blade cleaning flaw detection device. Background Art

[0002] Wind power generation is a renewable and clean energy source with little environmental pollution, a high degree of automation, and easy remote control. It can meet the electricity needs of sparsely populated areas where power grids are difficult to reach. Therefore, wind power generation has more important economic and social benefits, and blades are the key components of wind turbines.

[0003] After a period of use, wind turbine blades need to be inspected regularly to prevent the blades from being damaged or bent on the surface, which may affect the power generation effect of the wind turbine. At this time, a flaw detection device is needed to detect surface damage or bending of the blades to ensure the normal use of the wind turbine blades.

[0004] Existing blade flaw detection devices, such as patent application number CN202210153153.4, fix the fan blades and use a movable robot. The robot moves on the fan blades and sticks to the surface of the fan blades through the detection device. Then, the surface of the fan blades is continuously inspected by moving to determine whether there are any scratches. However, this process is relatively slow and inefficient, and there are certain shortcomings. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a blade flaw detection device that can overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: comprising a lifting rod, multiple sets of data acquisition probes, and a base, wherein the lifting rod is fixedly connected to the base, and further comprising:

[0007] A fan blade mounting ring, fixedly connected to the telescopic end of the lifting rod;

[0008] A bottom mounting frame is arranged below the fan blade mounting ring, the bottom mounting frame is fixedly connected to the base, and two sets of clamping rings are connected inside the bottom mounting frame;

[0009] An industrial fan unit is arranged on the opposite side of the lifting rod, and the industrial fan unit is fixedly connected to the base;

[0010] Two groups of mounting frames are arranged on both sides of the lifting rod, and the mounting frames are fixedly connected to the base, a fixed shell is fixedly connected to the mounting frame, a sliding rod is slidably connected in the fixed shell, both ends of the sliding rod pass through the fixed shell, and a windward plate is fixedly connected to the through end of the sliding rod facing the lifting rod, one end of the sliding rod away from the windward plate is located outside the fixed shell, and the data acquisition probe is arranged on the rear side of a side of the mounting frame away from the lifting rod;

[0011] A spring component is connected to the sliding rod, and the other end of the spring component is connected to the fixed shell.

[0012] In order to facilitate the movement of the clamping ring, a sliding groove is further provided in the bottom mounting frame, a sliding block is slidably connected in the sliding groove, a telescopic cylinder 1 is fixedly connected to the sliding block, the clamping ring is fixedly connected to the telescopic end of the telescopic cylinder 1, the clamping ring is fixedly connected to the telescopic cylinder 2, and the telescopic end of the telescopic cylinder 2 passes through the clamping ring.

[0013] In order to facilitate the movement of the clamping ring and thus determine the displacement range of the blade and detect the strength of the blade, further, a sensing head is fixedly connected to the bottom mounting frame, and the sensing head is used to sense the displacement of the sliding block.

[0014] In order to facilitate the fixation of the sensing head, further, an extension plate is fixedly connected to the bottom mounting frame, and the sensing head is fixedly connected to the extension plate.

[0015] In order to facilitate limiting the displacement of the sliding block, it is convenient to detect the force direction of the blade surface by controlling the airflow, blade angle and position, and then perform flaw detection on the blade. Furthermore, a limiting telescopic rod is arranged in the sliding groove, and the telescopic end of the limiting telescopic rod is used to limit the sliding of the sliding block.

[0016] In order to facilitate the replacement of the position of the blades and to facilitate the control of the position of the blades, further, a mounting plate is fixedly connected to the telescopic end of the lifting rod, reinforcing ribs are provided on the mounting plate, a driving motor is fixedly connected to the mounting plate, and the fan blade mounting ring is fixedly connected to the output end of the driving motor.

[0017] In order to facilitate the sliding and resetting of the sliding rod, further, a sliding ring is fixedly connected to the sliding rod, and the spring member is connected to the sliding ring.

[0018] In order to facilitate the cooperation with the data acquisition head and to establish a more complete data model, a displacement sensor is further fixedly connected to the end of the sliding rod away from the windward plate.

[0019] In order to facilitate cleaning of the blades, further, a water tank is fixedly connected to the base, a water pump is connected to the water tank, and an output end of the water pump is connected to a liquid outlet pipe.

[0020] In order to increase the cleaning effect, further, a plurality of groups of high-pressure nozzles are arranged on the liquid outlet pipe, and the high-pressure nozzles are used to clean the blades.

[0021] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention guides the airflow to both sides through the curvature of the blade surface by blowing wind on the blade. At this time, the intensity and range of the guided airflow can be detected by the displacement of multiple sliding rods, so that the blade can be inspected to determine whether there are dents, scratches or bends on the surface, which is convenient for flaw detection on the blade surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a wind turbine blade cleaning and flaw detection device proposed by the present invention Figure 1 ;

[0024] Figure 2 A wind turbine blade cleaning and flaw detection device proposed by the present invention Figure 1 Schematic diagram of the structure of part A;

[0025] Figure 3 A schematic diagram of the three-dimensional structure of a wind turbine blade cleaning and flaw detection device proposed by the present invention Figure 2 ;

[0026] Figure 4 A schematic diagram of the structure of a lifting rod in a wind turbine blade cleaning and flaw detection device proposed by the present invention Figure 1 ;

[0027] Figure 5 A wind turbine blade cleaning and flaw detection device proposed by the present invention Figure 4 The structural diagram of part B;

[0028] Figure 6 A wind turbine blade cleaning and flaw detection device proposed by the present invention Figure 4 Schematic diagram of the structure of part C;

[0029] Figure 7 This is a schematic diagram of the structure of a fixed shell, a sliding rod, a windward plate and other devices in a wind turbine blade cleaning and flaw detection device proposed by the present invention;

[0030] Figure 8 A schematic diagram of the structure of a lifting rod in a wind turbine blade cleaning and flaw detection device proposed by the present invention Figure 2 ;

[0031] Fig. 9 This is a schematic structural diagram of a bottom mounting frame in a wind turbine blade cleaning and flaw detection device proposed by the present invention;

[0032] Fig.10 The present invention provides a schematic structural diagram of a limit telescopic rod and a sliding block in a bottom mounting frame of a wind turbine blade cleaning and flaw detection device.

[0033] In the figure: 1. lifting rod; 101. mounting plate; 102. driving motor; 103. fan blade mounting ring; 2. industrial fan unit; 3. mounting frame; 301. fixed shell; 302. sliding rod; 3021. sliding ring; 3022. spring member; 303. windward plate; 304. displacement sensor; 4. data acquisition probe; 5. water tank; 501. water pump; 502. liquid outlet pipe; 503. high-pressure nozzle; 6. bottom mounting frame; 601. sliding groove; 602. sliding block; 6021. limiting telescopic rod; 603. telescopic cylinder one; 604. clamping ring; 605. telescopic cylinder two; 606. extension plate; 607. induction head. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0035] Example 1: Reference Figure 1 , Figure 3 , Figure 4 , Figure 8 A wind turbine blade cleaning and flaw detection device comprises a lifting rod 1, a plurality of data acquisition probes 4, and a base. The lifting rod 1 is fixedly connected to the base, and further comprises: a blade mounting ring 103, fixedly connected to the telescopic end of the lifting rod 1, the blade mounting ring 103 is a conventional clamping device, similar to the mounting ring for mounting blades on a wind turbine, and is mainly used to fix and clamp the blades; a bottom mounting frame 6, arranged below the blade mounting ring 103, the bottom mounting frame 6 is fixedly connected to the base, and two groups of clamping rings 604 are connected inside the bottom mounting frame 6; an industrial fan group 2, arranged on the opposite side of the lifting rod 1; two groups of mounting frames 3, arranged on both sides of the lifting rod 1, such as Figure 1As shown, two groups of mounting frames 3 are respectively located on both sides of the windward surface of the lifting rod 1, so that the wind blown away by the fan blades can be "collected". A fixed shell 301 is fixedly connected to the mounting frame 3, and a sliding rod 302 is slidably connected in the fixed shell 301. Both ends of the sliding rod 302 penetrate the fixed shell 301, and a windward plate 303 is fixedly connected to the end of the sliding rod 302 that penetrates the lifting rod 1. The end of the sliding rod 302 away from the windward plate 303 is located outside the fixed shell 301. The data acquisition probe 4 is arranged on the mounting frame 3 The rear side of a side away from the lifting rod 1; a sliding ring 3021 is fixedly connected to the sliding rod 302, and a spring member 3022 is connected to the sliding ring 3021; ​​it should be noted that the lifting rod 1, the bottom mounting frame 6, the industrial fan unit 2, the mounting frame 3, and the data acquisition probe 4 in the present device must be firmly fixed on the base, the base can be the ground, and when the present device is in use, in order to reduce the impact of the surrounding environment on the detection, it must be set in a closed environment, and the detection angle of the data acquisition probe 4 will not rotate due to the wind.

[0036] When the device is in use, each device is fixedly connected to the ground, and then the individual blades of the wind turbine are installed on the blade mounting ring 103 through the lifting device. Before use, it is necessary to adjust the height of the lifting rod 1 to facilitate the installation of blades of different sizes. After the installation is completed, the height of the lifting rod 1 is moved, so that the tail end of the fixed blade comes into the clamping ring 604, and the tail end of the blade is fixed by the clamping ring 604. At this time, it should be noted that the fixed position of the blade should be able to make the wind blown out by the industrial fan unit 2 be tilted to both sides by the inclined arc surface on the blade, so that the wind is guided to the mounting frames 3 on both sides. When the blade is designed, a flat surface will be set, and the other side will have a curved surface with a middle arch. The curved surface is used to generate a certain force when the wind blows, so as to rotate the blade for power generation. At this time, the fixed position needs to make the arc surface face the industrial fan unit 2. At the same time, when the industrial fan unit 2 is set, it needs to meet the requirements of accurately concentrating the wind force on the fan blades, and minimizing the influence of the blown wind on the wind guided by the blades.

[0037] After the installation is completed, the industrial fan unit 2 and the data acquisition head 4 can be started. At this time, the wind is blown out from the industrial fan unit 2 and comes to the blades. At this time, under the action of the blowing wall effect, a thin layer of airflow is formed on the curved surface of the blade. This airflow will flow along the surface of the object, forming an effect similar to "adsorption", so that the dust on the surface of the object is adsorbed away, which has a certain cleaning effect. At the same time, affected by the curved surface of the blade, most of the wind will be blown to both sides along the curved surface, and then come to the installation frames 3 on both sides. At this time, the wind will blow to the windward plate 303, and then generate a certain pressure and displacement, thereby causing the sliding rod 302 to move in position. At this time, the sliding rod 302, which is in the same plane or the same length in the initial state, will produce a partial position. At this time, the data acquisition camera 4 collects the moving part and then transmits it Into the computer, a three-dimensional model diagram is generated. At this time, the guiding performance of the arc surface of the blade under the wind can be obtained. Because the arc surfaces at different positions of the blade are specially designed when the blade is designed, at this time, it is only necessary to place this type of new blade on the fan blade mounting ring 103. While ensuring that the wind force, blade position, and mounting frame 3 position are the same, the wind guiding range of the new blade is modeled to generate a standard model. At this time, the two models can be compared to achieve flaw detection on the blade surface. Because the blade is affected by the outside world during use, scratches and even bends will appear on the surface. At this time, these will affect the wind-inducing performance of the blade itself. At this time, the blade can be tested through the data model. Compared with conventional ultrasonic testing, the surface of the blade can be cleaned while achieving detection.

[0038] Example 2: Reference Figure 4 , Fig. 9 , Fig.10 , a wind turbine blade cleaning and flaw detection device, which is basically the same as Example 1, and further: a sliding groove 601 is arranged in the bottom mounting frame 6, a sliding block 602 is slidably connected in the sliding groove 601, a telescopic cylinder 1 603 is fixedly connected to the sliding block 602, a clamping ring 604 is fixedly connected to the telescopic end of the telescopic cylinder 1 603, a telescopic cylinder 2 605 is fixedly connected to the clamping ring 604, and the telescopic end of the telescopic cylinder 2 605 passes through the clamping ring 604, a sensing head 607 is fixedly connected to the bottom mounting frame 6, and the sensing head 607 is used to sense the displacement of the sliding block 602, an extension plate 606 is fixedly connected to the bottom mounting frame 6, and the sensing head 607 is fixedly connected to the extension plate 606, a limited telescopic rod 6021 is arranged in the sliding groove 601, and the telescopic end of the limited telescopic rod 6021 is used to limit the sliding of the sliding block 602, such as Fig.10As shown, the telescopic ends of the limiting telescopic rod 6021 are located on both sides of the sliding block 602, which plays a limiting role. When the wind force is subsequently detected, the clamping ring 604 will not be able to move, so that the variables can be effectively controlled and the accuracy of the detection modeling can be improved. When the toughness of the fan blades needs to be tested later, the limiting telescopic rod 6021 can be shortened to move the sliding block 602 to increase the detection range.

[0039] By setting the movable sliding block 602, the restriction of the sliding block 602 can be released when the blade is inspected for flaws. At this time, the telescopic ends of the limiting telescopic rods 6021 on both sides of the sliding block 602 are contracted. At this time, the sliding block 602 can be moved, and the industrial fan unit 2, the sensor head 607 and the data acquisition head 4 can be started. At this time, the wind is blown out from the industrial fan unit 2 and comes to the blade. At this time, under the action of the blowing wall effect, a thin layer of airflow is formed on the curved surface of the blade. This airflow will flow along the surface of the object, forming an effect similar to "adsorption", so that the dust on the surface of the object is adsorbed away, which has a certain cleaning effect. At the same time, affected by the curved surface of the blade, most of the wind will be blown to both sides along the curved surface, and then come to the installation frames 3 on both sides. At this time, the wind will blow to the windward plate 303, thereby generating a certain pressure, producing The sliding rod 302 is displaced, and then the sliding rod 302 is positioned. At this time, the sliding rod 302, which is in the same plane and has the same length in the initial state, will produce a partial position. At this time, the data acquisition camera 4 collects the moving part, and then transmits it to the computer to generate a three-dimensional model. Since the sliding block 602 is movable at this time, that is, the clamping ring 604 is movable, the tail end of the blade will move continuously under the influence of wind. The movement at this time is the detection of the toughness of the blade itself. The displacement range of the sliding block 602 is sensed by the sensing head 607. When the wind force and the blade orientation position are determined to be the same, it is compared with the new blade leaving the factory to detect the toughness and strength of the blade, so as to avoid the blade's own flexibility decreasing over a long period of time, which leads to the bending or even breaking of the blade, thereby realizing the flaw detection of the blade surface and toughness strength.

[0040] At this time, the arrangement of telescopic cylinder 1 603 and telescopic cylinder 2 605 is to facilitate the fixation of blades of different sizes and to facilitate detection.

[0041] Example 3: Reference Figure 4 , Figure 5 , Figure 6 , Figure 8, a wind turbine blade cleaning and flaw detection device, which is basically the same as Example 2, and further: a mounting plate 101 is fixedly connected to the telescopic end of the lifting rod 1, and a reinforcing rib is arranged on the mounting plate 101, and a driving motor 102 is fixedly connected to the mounting plate 101, and a fan blade mounting ring 103 is detachably connected to the output end of the driving motor 102, and a water tank 5 is fixedly connected to the base or the ground, and a water pump 501 is connected in the water tank 5, and the output end of the water pump 501 is connected to a liquid outlet pipe 502, and a plurality of groups of high-pressure nozzles 503 are arranged on the liquid outlet pipe 502, and the high-pressure nozzles 503 are used to clean the blades.

[0042] Before using the device, water can be first injected into the water tank 5, and then the fan blades can be fixed by the fan blade mounting ring 103. At this time, the tail end of the blade is not fixed. At this time, the water pump 501 and the drive motor 102 can be started, and water can be pumped out by the water pump 501, and then the surface of the blade is rinsed and cleaned by the high-pressure nozzle 503. At the same time, the drive motor 102 can make the blade rotate slowly, and then various positions of the blade are cleaned to prevent dust and other impurities from affecting the flaw detection effect of the blade. When encountering wind turbine blades used at the seaside, some acid can be injected into the water tank 5, and then the alkaline substances on the blades can be improved through acid-base neutralization. The cleaning effect is good. After the cleaning is completed, the water pump 501 is turned off and the industrial fan unit 2 is started to dry the surface of the blade. At this time, under the action of the blowing wall effect, a thin layer of airflow is formed on the curved surface of the blade. This airflow will flow along the surface of the object, forming an effect similar to "adsorption", so that the dust on the surface of the object is adsorbed away, which has a certain cleaning effect. This process is suitable for use in places such as the sea or forests, where there are too many external impurities and the blades are attached with more impurities. In normal use, if there is only dust, the tail end of the fan blade can be directly fixed and then tested.

[0043] After cleaning, the bottom of the blade can be fixed by the clamping ring 604, and then the industrial fan unit 2 and the data acquisition head 4 are started. At this time, the wind is blown out from the industrial fan unit 2 and comes to the blade. At the same time, affected by the curved surface of the blade, most of the wind will blow to both sides along the curved surface, and then come to the installation frames 3 on both sides. At this time, the wind will blow to the windward plate 303, and then generate a certain pressure and displacement, thereby causing the sliding rod 302 to move in position. At this time, the sliding rod 302, which is in the same plane or the same length in the initial state, will produce a partial position. At this time, the data acquisition camera 4 collects the moving part and then transmits it to the computer. A three-dimensional model diagram is generated, and at this time, the guiding performance of the arc surface of the blade under wind can be obtained. Because the arc surfaces at different positions of the blade are specially designed when the blade is designed, at this time, it is only necessary to place this type of new blade on the fan blade mounting ring 103, and model the wind guidance range of the new blade while ensuring that the wind force, blade position, and mounting frame 3 position are the same, and generate a standard model. At this time, the two models can be compared to achieve flaw detection on the blade surface, and then the limiting effect of the clamping ring 604, i.e., the sliding block 602, can be released, and the toughness strength of the blade can be comprehensively tested.

[0044] Example 4: Reference Figure 2 , Figure 7 , a wind turbine blade cleaning and flaw detection device, which is basically the same as Example 3, and further: a displacement sensor 304 is fixedly connected to the end of the sliding rod 302 away from the windward plate 303.

[0045] By setting the displacement sensor 304, it is possible to detect whether the sliding rod 302 is reset after use. At the same time, it can also be used in conjunction with the data acquisition head 4. At this time, the transmitted data is more accurate and can better realize the detection of blade flaws.

[0046] The present invention guides the airflow to both sides by blowing wind on the blades and then guiding the airflow to both sides through the curvature of the blade surface. At this time, the strength and range of the guided airflow can be detected by the displacement of multiple sliding rods 302, and the blades can be inspected to determine whether there are dents, scratches or bends on the surface, which is convenient for flaw detection on the blade surface.

[0047] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A wind turbine blade cleaning and flaw detection device, comprising a lifting rod (1), a plurality of data acquisition probes (4), and a base, wherein the lifting rod (1) is fixedly connected to the base, and is characterized in that: Also includes: A fan blade mounting ring (103) fixedly connected to the telescopic end of the lifting rod (1); A bottom mounting frame (6) is arranged below the fan blade mounting ring (103), the bottom mounting frame (6) is fixedly connected to the base, and two groups of clamping rings (604) are connected inside the bottom mounting frame (6); An industrial fan unit (2) is arranged on the opposite side of the lifting rod (1), and the industrial fan unit (2) is fixedly connected to the base; Two groups of mounting frames (3) are arranged on both sides of the lifting rod (1), and the mounting frames (3) are fixedly connected to the base, a fixed shell (301) is fixedly connected to the mounting frame (3), a sliding rod (302) is slidably connected inside the fixed shell (301), both ends of the sliding rod (302) pass through the fixed shell (301), and a windward plate (303) is fixedly connected to the through end of the sliding rod (302) facing the lifting rod (1), and one end of the sliding rod (302) away from the windward plate (303) is located outside the fixed shell (301), and the data acquisition probe (4) is arranged on the rear side of a side of the mounting frame (3) away from the lifting rod (1); A spring member (3022) is connected to the sliding rod (302), and the other end of the spring member (3022) is connected to the fixed shell (301).

2. A wind turbine blade cleaning and flaw detection device according to claim 1, characterized in that: The bottom mounting frame (6) is provided with a sliding groove (601), a sliding block (602) is slidably connected in the sliding groove (601), a telescopic cylinder 1 (603) is fixedly connected to the sliding block (602), the clamping ring (604) is fixedly connected to the telescopic end of the telescopic cylinder 1 (603), the clamping ring (604) is fixedly connected to the telescopic end of the telescopic cylinder 1 (603), the clamping ring (604) is fixedly connected to the telescopic cylinder 2 (605), the telescopic end of the telescopic cylinder 2 (605) passes through the clamping ring (604), and the telescopic end of the telescopic cylinder 2 (605) is used to clamp the tail end of the fan blade.

3. A wind turbine blade cleaning and flaw detection device according to claim 2, characterized in that: The bottom mounting frame (6) is fixedly connected with a sensing head (607), and the sensing head (607) is used to sense the displacement of the sliding block (602).

4. A wind turbine blade cleaning and flaw detection device according to claim 3, characterized in that: An extension plate (606) is fixedly connected to the bottom mounting frame (6), and the induction head (607) is fixedly connected to the extension plate (606).

5. A wind turbine blade cleaning and flaw detection device according to claim 2, characterized in that: A limited telescopic rod (6021) is arranged in the sliding groove (601), and the telescopic end of the limited telescopic rod (6021) is used to limit the sliding of the sliding block (602).

6. A wind turbine blade cleaning and flaw detection device according to claim 1, characterized in that: A mounting plate (101) is fixedly connected to the telescopic end of the lifting rod (1), a reinforcing rib is provided on the mounting plate (101), a driving motor (102) is fixedly connected to the mounting plate (101), and the fan blade mounting ring (103) is fixedly connected to the output end of the driving motor (102).

7. A wind turbine blade cleaning and flaw detection device according to claim 1, characterized in that: A sliding ring (3021) is fixedly connected to the sliding rod (302), and the spring member (3022) is connected to the sliding ring (3021).

8. A wind turbine blade cleaning and flaw detection device according to claim 7, characterized in that: A displacement sensor (304) is fixedly connected to one end of the sliding rod (302) away from the windward plate (303).

9. A wind turbine blade cleaning and flaw detection device according to claim 1, characterized in that: A water tank (5) is fixedly connected to the base, a water pump (501) is connected inside the water tank (5), and an output end of the water pump (501) is connected to a liquid outlet pipe (502).

10. A wind turbine blade cleaning and flaw detection device according to claim 9, characterized in that: The liquid outlet pipe (502) is provided with a plurality of groups of high-pressure nozzles (503), and the high-pressure nozzles (503) are used to clean the blades.

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