Waterproof power take-off brake for pesticide spraying aircraft

Abstract

The utility model relates to the technical field of brake, provide a waterproof type electricity brake for pesticide spraying airplane, including the magnetic yoke, armature and rotor that arrange in proper order, the magnetic yoke one end is equipped with ring groove and is built -in coil, the elastic member is established between armature and rotor to make it far from the magnetic yoke, still include the waterproof cover that is connected in the ring groove one end of the magnetic yoke through fastener, the waterproof cover is by the outer ring, middle ring and inner ring welding formation plate -shaped that arrange in proper order, the outer ring and inner ring are magnetically conductive material, the middle ring is non -magnetic material, the magnetic yoke is equipped with sealing ring between waterproof cover and both sides in ring groove. The utility model is local protection, improves waterproof performance, and compared with the existing whole protection mode, avoids the influence friction heat dissipation when braking.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and more specifically, to a waterproof electrically powered brake for pesticide spraying aircraft. Background Technology

[0002] Pesticide spraying aircraft require brakes to achieve cyclic emergency braking of the propeller mechanism, ensuring attitude control and safe parking during flight operations. Furthermore, to conserve energy, these brakes are mostly energized. During operation, pesticide spraying aircraft continuously spray liquid pesticides, making the fuselage and related components susceptible to pesticide droplets. The high humidity and heavy dew in field environments allow moisture to easily penetrate the brake coils through the brake gaps, causing insulation damage and leading to short circuits, leakage, and other malfunctions. This not only renders the brakes ineffective but can also damage the aircraft's power system in severe cases, posing a significant threat to flight safety.

[0003] Currently, to provide waterproofing for brakes, most methods involve overall protection of the brake assembly (encasing internal components within a shell). However, due to the unique location of the brakes on pesticide spraying aircraft, overall protection is difficult. Furthermore, the brakes operate in a cyclic, rapid braking mode, generating significant heat during braking. Overall protection would hinder heat dissipation. Therefore, improving the waterproofing performance of pesticide spraying aircraft is a pressing issue that needs to be addressed in this field. Utility Model Content

[0004] The purpose of this invention is to provide a waterproof electrostatic brake for pesticide spraying aircraft, so as to solve the defects of overall protection in the prior art, provide a new protective measure for the brake of pesticide spraying aircraft, and improve waterproof performance.

[0005] This utility model is achieved through the following technical solution: A waterproof electro-energized brake for pesticide spraying aircraft includes a magnetic yoke, an armature, and a rotor arranged in sequence. One end of the magnetic yoke has an annular groove and a coil is built into it. An elastic element is provided between the armature and the rotor to keep it away from the magnetic yoke. The brake also includes a waterproof cover plate connected to the end of the magnetic yoke with the annular groove by fasteners. The waterproof cover plate is formed by welding an outer ring, a middle ring, and an inner ring arranged in sequence. The outer ring and the inner ring are made of magnetically conductive material, while the middle ring is made of non-magnetically conductive material. Sealing rings are provided on both the inner and outer sides of the annular groove between the magnetic yoke and the waterproof cover plate.

[0006] Optionally, the intermediate ring does not extend beyond the area enclosed between the inner and outer sides of the ring groove.

[0007] Optionally, the intermediate ring is provided with a friction plate on the side near the armature.

[0008] Optionally, the armature is provided with a positioning groove, and the friction plate is disposed in the positioning groove.

[0009] Optionally, the friction plate and the armature are integrally formed by powder metallurgy.

[0010] Optionally, the elastic element is an annular spring sheet. The annular spring sheet is connected between the armature and the rotor by a first set of screws and a second set of screws. The first set of screws is connected to the armature and presses the annular spring sheet tightly. The second set of screws is connected to the rotor and presses the annular spring sheet tightly. Both the armature and the rotor are provided with clearance through holes at the location corresponding to the second set of screws and at the location corresponding to the first set of screws.

[0011] Optionally, the magnetic yoke is connected to the rotor via bearings.

[0012] Optionally, the end of the magnetic yoke furthest from the armature is provided with a mounting plate, and the mounting plate is provided with a plurality of connecting through holes along the circumferential direction.

[0013] The technical solution of this utility model has at least the following advantages and beneficial effects: In this utility model, sealing rings are provided on both the inner and outer sides of the annular groove between the magnetic yoke and the waterproof cover plate. After the waterproof cover plate and the magnetic yoke are connected by fasteners, they fit tightly and press the sealing rings to improve the waterproof performance of the coil. This method is a local protection, which avoids affecting the friction and heat dissipation during braking compared with the existing overall protection method. Attached Figure Description

[0014] Figure 1 A schematic diagram of a waterproof electro-energized brake for an agricultural spraying aircraft provided by this utility model; Figure 2 This is a structural schematic diagram of the waterproof cover plate; Figure 3 for Figure 2 AA section view in the middle; Reference numerals: 1-Magnetic yoke, 101-Mounting plate, 102-Connecting through hole, 2-Coil, 3-Armature, 4-Rotor, 5-Elastic element, 6-Waterproof cover, 601-Outer ring, 602-Intermediate ring, 603-Inner ring, 7-Sealing ring, 8-Fastener, 9-Friction plate, 10-First set of screws, 11-Second set of screws. Detailed Implementation

[0015] refer to Figure 1 A waterproof, electrically powered brake for pesticide spraying aircraft includes a magnetic yoke 1, an armature 3, and a rotor 4 arranged sequentially. One end of the magnetic yoke 1 has an annular groove and a coil 2 is embedded therein. An elastic element 5 is provided between the armature 3 and the rotor 4 to keep it away from the magnetic yoke 1. In practical applications, when the power is off, the armature 3 is held in place by the elastic element 5, creating a gap between it and the magnetic yoke 1. When the coil 2 is energized, the magnetic yoke 1 attracts the armature 3 (restraining the elastic element 5), thus forming a brake.

[0016] Building upon the above, the brake also includes a waterproof cover plate 6. The waterproof cover plate 6 is connected to the end of the magnetic yoke 1 with an annular groove via fasteners 8 (e.g., screws, pins, etc.). Sealing rings 7 are provided on both the inner and outer sides of the annular groove between the magnetic yoke 1 and the waterproof cover plate 6. After the waterproof cover plate 6 and the magnetic yoke 1 are connected by the fasteners 8, they fit tightly together, pressing the sealing rings 7 and improving the waterproof performance of the coil 2. This method provides partial protection, which, compared to existing overall protection methods, avoids affecting frictional heat dissipation during braking.

[0017] refer to Figure 2 and Figure 3 The waterproof cover plate 6 is formed by welding an outer ring 601, a middle ring 602, and an inner ring 603 arranged in sequence. The outer ring 601 and the inner ring 603 are made of magnetically conductive material, while the middle ring 602 is made of non-magnetically conductive material. In practical applications, the materials of the outer ring 601 and the inner ring 603 are the same as those of the magnetic yoke 1. The material of the middle ring 602 is not limited, as long as it does not have magnetic properties and can be welded to the outer ring 601 and the inner ring 603. With this configuration, the outer ring 601 and the inner ring 603 are equivalent to the extension of the magnetic yoke 1 at the end with the annular groove. At the same time, it avoids the waterproof cover plate 6 from closing the magnetic circuit and causing a magnetic short circuit, ensuring that the armature 3 can be attracted through the waterproof cover plate 6 when the coil 2 is energized.

[0018] Refer again Figure 1 In this embodiment, the magnetic yoke 1 and the rotor 4 are connected by bearings. In actual use, the inner wall of the rotor 4 is connected to the power shaft of the propeller mechanism and rotates together with the power shaft of the propeller mechanism. Furthermore, a mounting plate 101 is provided at the end of the magnetic yoke 1 away from the armature 3. The mounting plate 101 is integrally formed with the magnetic yoke 1. Several connecting through holes 102 are provided on the mounting plate 101 along the circumferential direction. In actual use, the magnetic yoke 1 is connected and fixed to the mounting surface by screws passing through the connecting through holes 102.

[0019] In this embodiment, the intermediate ring 602 does not extend beyond the area enclosed between the inner and outer sides of the ring groove. Alternatively, the area of ​​the intermediate ring 602 is equal to the area enclosed between the inner and outer sides of the ring groove, and it just covers the opening end of the ring groove during installation. At the same time, the outer ring 601 matches the area of ​​the magnetic yoke 1 outside the ring groove, and the inner ring 603 matches the area of ​​the magnetic yoke 1 inside the ring groove. The inner ring 603 and the outer ring 601 are equivalent to an extension of the magnetic yoke 1 at the end with the ring groove. This arrangement avoids damaging the size of the magnetic circuit and losing magnetic force.

[0020] A friction plate 9 is provided on the side of the intermediate ring 602 near the armature 3. Furthermore, the armature 3 has a positioning groove, and the friction plate 9 is disposed within the positioning groove. In this embodiment, the friction plate 9 and the armature 3 are integrally formed using powder metallurgy. It is worth noting that, because the brake operates under cyclic emergency braking conditions and is directly connected to the propeller mechanism at high speeds, conventional friction plates 9 are prone to wear. In addition, the high humidity in the working environment easily leads to failure of conventional friction plates 9. Although the friction coefficient of the friction plate 9 formed by powder metallurgy is lower, the electric brake operates under rated voltage, and the large electromagnetic force generated compensates for the low friction coefficient of the material. Moreover, powder metallurgy is more wear-resistant and can withstand greater loads.

[0021] The elastic element 5 is a ring-shaped spring sheet. The ring-shaped spring sheet is connected between the armature 3 and the rotor 4 by a first set of screws 10 and a second set of screws 11. The first set of screws 10 connects to the armature 3 and presses the ring-shaped spring sheet tightly, while the second set of screws 11 connects to the rotor 4 and presses the ring-shaped spring sheet tightly. The specific number of the first set of screws 10 and the second set of screws 11 is not specifically limited. For example, in this embodiment, there are three of each set (or other numbers). The first set of screws 10 and the second set of screws 11 are evenly spaced and staggered. Clearance holes are provided at the locations corresponding to the second set of screws 11 on the armature 3 and at the locations corresponding to the first set of screws 10 on the rotor 4. It should be understood that the clearance holes should be larger than the diameter of the heads of the first set of screws 10 and the second set of screws 11. In other embodiments, the elastic element 5 can also be a cylindrical spring.

[0022] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A waterproof electrically operated brake for an agricultural spraying aircraft, comprising a magnetic yoke, an armature, and a rotor arranged sequentially, wherein one end of the magnetic yoke has an annular groove and a coil is embedded therein, and an elastic element is provided between the armature and the rotor to keep it away from the magnetic yoke, characterized in that, It also includes a waterproof cover plate connected to one end of the magnetic yoke with an annular groove by fasteners. The waterproof cover plate is formed by welding an outer ring, a middle ring and an inner ring arranged in sequence. The outer ring and the inner ring are made of magnetically conductive material, and the middle ring is made of non-magnetically conductive material. A sealing ring is provided between the magnetic yoke and the waterproof cover plate on both the inner and outer sides of the annular groove.

2. The waterproof electro-energized brake for pesticide spraying aircraft according to claim 1, characterized in that, The intermediate ring does not extend beyond the area enclosed between the inner and outer sides of the ring groove.

3. The waterproof electro-energized brake for pesticide spraying aircraft according to claim 1, characterized in that, The intermediate ring has a friction plate on the side closest to the armature.

4. The waterproof electro-energized brake for pesticide spraying aircraft according to claim 3, characterized in that, The armature is provided with a positioning groove, and the friction plate is disposed in the positioning groove.

5. The waterproof electro-energized brake for pesticide spraying aircraft according to claim 4, characterized in that, The friction plate and the armature are integrally formed by powder metallurgy.

6. The waterproof electro-energized brake for pesticide spraying aircraft according to claim 1, characterized in that, The elastic element is a ring spring sheet. The ring spring sheet is connected between the armature and the rotor by a first set of screws and a second set of screws. The first set of screws is connected to the armature and presses the ring spring sheet tightly. The second set of screws is connected to the rotor and presses the ring spring sheet tightly. There are clearance through holes at the position of the second set of screws on the armature and at the position of the first set of screws on the rotor.

7. The waterproof electro-energized brake for pesticide spraying aircraft according to claim 1, characterized in that, The magnetic yoke is connected to the rotor via bearings.

8. The waterproof electro-energized brake for pesticide spraying aircraft according to claim 1, characterized in that, The end of the magnetic yoke furthest from the armature is provided with a mounting plate, and the mounting plate has several connecting through holes along the circumferential direction.

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