Blade counterweight support and counterweight method thereof

Abstract

The invention provides a paddle balance weight support and a balance weight method thereof, and relates to the technical field of propellers, the paddle balance weight support comprises a support body, the support body is a rotary body, and the support body is used for being fixed to the root of a paddle; a central counterweight hole and edge counterweight holes are formed in the support body, and the central counterweight hole and the support body are coaxially arranged; the plurality of edge counterweight holes are uniformly formed in the periphery of the central counterweight hole in a surrounding manner; the radial section of each edge counterweight hole is approximately trapezoidal, the approximately trapezoidal shape comprises an inner edge, an outer edge and waist lines, the inner edge and the outer edge are arc-shaped and are concentric with the support body, the lengths of the two waist lines are the same, and the two waist lines are respectively connected with the end point of the inner edge and the end point of the outer edge; according to the balance weight support, the edge balance weight holes are approximately trapezoidal, the size of the support body can be fully utilized, the support body is provided with the balance weight cavity with the larger volume, the torque adjusting capacity of the balance weight support on the blades is improved, and pneumatic balance of the propeller can be better achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of propellers, and in particular to a blade counterweight support and a counterweight method thereof. Background Art

[0002] A propeller generally contains several blades, and the more typical blades are composite blades. Due to manufacturing deviations of composite materials, there are differences in the distribution of the center of gravity of the blades. Directly using the blades in this state will cause the blades to be unbalanced and produce vibration problems. In order to balance the blades, it is necessary to adjust the center of gravity of the blades so that the difference in the blade torque values ​​is controlled within a certain range. The existing composite blades are provided with a porous counterweight support made of nylon material at the root of the blades. When the blades are balanced, the counterweight material is filled into the counterweight support hole to adjust the blade torque. According to actual production conditions, the counterweight capacity of the existing counterweight support has certain limitations, and the torque value deviations of some blades are large. Filling the counterweight hole of the existing counterweight support with counterweight material cannot make the blade torque reach the required value, resulting in the inability to use the blade normally.

[0003] Therefore, how to design a propeller blade counterweight support structure that can both improve the blade counterweight capacity and ensure safety and reliability is a technical problem that technicians need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a blade counterweight support and a counterweight method thereof to solve the problems existing in the prior art. The edge counterweight hole in the present invention is nearly trapezoidal in shape, which can make full use of the volume of the support body, so that the support body has a counterweight cavity with a larger volume, thereby improving the counterweight support's ability to adjust the torque of the blade, and is more conducive to achieving aerodynamic balance of the propeller.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A blade counterweight support, comprising a support body, the support body being a rotating body, the support body being used to be fixed to the root of the blade; the support body being provided with a central counterweight hole and an edge counterweight hole, the central counterweight hole being coaxially arranged with the support body; a plurality of edge counterweight holes being provided, and being evenly arranged around the periphery of the central counterweight hole; a radial cross-section of the edge counterweight hole being a nearly trapezoidal shape, the nearly trapezoidal shape comprising an inner edge, an outer edge and a waistline, the inner edge and the outer edge being both arc-shaped concentric with the support body, the two waistlines having the same length, and the two waistlines respectively connecting the end points of the inner edge and the outer edge.

[0007] As an embodiment, transition fillets are provided at the connection position between the inner edge and the waistline and at the connection position between the outer edge and the waistline.

[0008] As an implementation manner, the hole depth of the central counterweight hole is greater than the hole depth of the edge counterweight hole.

[0009] As an embodiment, the bottom of the central counterweight hole and the bottom of the edge counterweight hole are both provided with air holes.

[0010] As an embodiment, an annular limit platform is further provided at the end of the support body, and the annular limit platform is provided at one end of the opening of the central counterweight hole; the annular limit platform is used to abut against the carbon tube in the blade.

[0011] As an embodiment, a latch is further provided on the outer surface of the bottom of the edge weight hole, and the latch is used to be inserted into the foam core in the blade.

[0012] As an implementation manner, the support body is injection molded using nylon material.

[0013] The present invention also discloses a counterweight method for a blade counterweight support as described above, comprising the following steps: inserting a counterweight wire or a counterweight strip into the central counterweight hole; inserting a counterweight block into the edge counterweight hole, wherein the cross-sectional shape of the counterweight block is equal to the shape and size of the edge counterweight hole.

[0014] As one embodiment, the counterweight block is extruded by a counterweight block extrusion mechanism, and the counterweight block extrusion mechanism includes an extrusion body, a fixed plate and an extrusion rod; a molding cavity is provided inside the extrusion body, and the cross-sectional shape and size of the molding cavity are equal to the cross-sectional shape and size of the edge counterweight hole; the fixed plate is fixedly connected to the extrusion body, and a screw hole coaxial with the molding cavity is provided on the fixed plate, and the extrusion rod is threadedly connected to the fixed plate through the screw hole, and an extrusion head equal to the cross-sectional shape and size of the molding cavity is provided at the end of the extrusion rod.

[0015] As an implementation manner, a screwing handle is further provided at the other end of the extrusion rod.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] The present invention can adjust the large axis moment of the blade by installing a counterweight in the central counterweight hole, can adjust the small axis moment of the blade by installing a counterweight in the edge counterweight hole, and can also adjust the large axis moment of the blade by installing a counterweight in the symmetrical edge counterweight hole, thereby ensuring the aerodynamic balance of the propeller. Moreover, the edge counterweight hole in the present invention is a nearly trapezoidal shape, which can fully utilize the volume of the support body, so that the support body has a counterweight cavity with a larger volume, improves the torque adjustment ability of the counterweight support to the blade, and is more conducive to achieving aerodynamic balance of the propeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic diagram of the structure of a blade counterweight support in one embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure from another perspective;

[0021] Figure 3 for Figure 1 A schematic diagram of a side cross-section structure;

[0022] Figure 4 A schematic diagram of the structure of an extrusion mechanism in one embodiment of the present invention;

[0023] Figure 5 for Figure 4 Schematic diagram of the side section structure.

[0024] Description of reference numerals:

[0025] 1. Support body; 2. Center counterweight hole; 3. Edge counterweight hole; 4. Air vent; 5. Annular limit platform; 6. Latch; 7. Extrusion body; 8. Fixing plate; 9. Extrusion rod; 10. Extrusion head; 11. Screw plug; 12. Twist handle; 13. Forming cavity. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a blade counterweight support and a counterweight method thereof to solve the problems existing in the prior art. The edge counterweight hole in the present invention is nearly trapezoidal in shape, which can make full use of the volume of the support body, so that the support body has a counterweight cavity with a larger volume, thereby improving the counterweight support's ability to adjust the torque of the blade, and is more conducive to achieving aerodynamic balance of the propeller.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1:

[0030] like Figure 1 to Figure 3 As shown, this embodiment discloses a blade counterweight support, including a support body 1, the support body 1 is a rotating body, and the support body 1 is used to be fixed at the root of the blade. The root of the blade includes a blade root jacket, a pad cloth and a carbon beam from the outside to the inside, the pad cloth is respectively connected to the blade root jacket and the carbon beam, and the inner side of the carbon beam is connected with a carbon tube and a foam core, the carbon tube and the foam core are connected, and the carbon tube is located on the side of the foam core close to the root of the blade. The support body 1 in this embodiment is plugged and fixed with the carbon tube. A central counterweight hole 2 and an edge counterweight hole 3 are provided on the support body 1, and the central counterweight hole 2 is coaxially arranged with the support body 1; a plurality of edge counterweight holes 3 are provided, and are evenly arranged around the periphery of the central counterweight hole 2. In this embodiment, the radial cross-section of the center counterweight hole 2 is circular, and the radial cross-section of the edge counterweight hole 3 is nearly trapezoidal. The nearly trapezoidal shape includes an inner edge, an outer edge and a waistline. The inner edge refers to the edge radially close to the center counterweight hole 2, and the outer edge refers to the edge radially away from the center counterweight hole 2. Both the inner edge and the outer edge are arc-shaped concentric with the support body 1. The two waistlines are the same length and both point to the center of the circular cross-section of the center counterweight hole 2. The two waistlines respectively connect the end points of the inner edge and the outer edge.

[0031] In this embodiment, by installing a counterweight in the central counterweight hole 2, the large axis moment of the blade can be adjusted, by installing a counterweight in the edge counterweight hole 3, the small axis moment of the blade can be adjusted, and by installing a counterweight in the symmetrical edge counterweight hole 3, the large axis moment of the blade can also be adjusted, thereby ensuring the aerodynamic balance of the propeller. Moreover, the edge counterweight hole 3 in this embodiment is nearly trapezoidal in shape, which can make full use of the volume of the support body 1, so that the support body 1 has a counterweight cavity with a larger volume, improve the torque adjustment ability of the counterweight support to the blade, and is more conducive to achieving aerodynamic balance of the propeller. Compared with the edge counterweight hole 3 with a circular cross-sectional shape in the traditional counterweight support, the volume of the edge counterweight hole 3 with a nearly trapezoidal shape in this embodiment is 1.4 to 1.7 times that of the edge counterweight hole 3 in the traditional counterweight support, and the total volume of the counterweight hole of the counterweight support is 1.2 to 1.5 times that of the total volume of the counterweight hole of the traditional counterweight support, which greatly improves the counterweight adjustment ability of the counterweight support.

[0032] As an implementation mode, in the nearly trapezoidal shape of the edge counterweight hole 3 of this embodiment, the connection position between the inner edge and the waistline and the connection position between the outer edge and the waistline are both provided with transition fillets.

[0033] As an implementation mode, in this embodiment, the hole depth of the central counterweight hole 2 is greater than the hole depth of the edge counterweight hole 3, so that the middle part and the bottom of the hole wall of the central counterweight hole 2 are inserted into the foam core.

[0034] As one implementation mode, in this embodiment, ventilation holes 4 are provided at the bottom of the center counterweight hole 2 and the bottom of the edge counterweight hole 3, which are used to exhaust air from the bottom of the hole when the counterweight block is placed in the center counterweight hole 2 and the edge counterweight hole 3, so as to avoid the problem of difficulty in inserting the counterweight block.

[0035] As an implementation mode, in this embodiment, an annular limit platform 5 is further provided at the end of the support body 1, and the annular limit platform 5 is provided at one end of the opening of the central counterweight hole 2; the annular limit platform 5 is used to abut against the carbon tube in the blade.

[0036] As an embodiment, the outer surface of the bottom of the edge weight hole 3 is also provided with a plug 6, and the plug 6 is used to be inserted into the foam core of the blade. The plug 6 does not necessarily correspond to the position of the edge weight hole 3, but the plug 6 must be located on the plane where the outer surface of the bottom of the hole is located; in this embodiment, two plugs 6 are provided.

[0037] As an implementation manner, the support body 1 in this embodiment is injection molded by nylon material.

[0038] Embodiment 2:

[0039] like Figure 4 , Figure 5 As shown, this embodiment discloses a weight balancing method implemented by using the blade weight support in embodiment 1, comprising the following steps: placing a weight wire or a weight bar into the central weight hole 2; placing a weight block into the edge weight hole 3, wherein the cross-sectional shape of the weight block is equal to the shape and size of the edge weight hole 3. The weight wire, the weight bar and the weight block are all made of lead.

[0040] As an embodiment, the counterweight is extruded by a counterweight extrusion mechanism, which includes an extrusion body 7, a fixing plate 8 and an extrusion rod 9; a forming cavity 13 is provided inside the extrusion body 7, and one end of the forming cavity 13 has a screw plug 11 threadedly connected to the extrusion body 7. The cross-sectional shape and size of the forming cavity 13 are equal to the cross-sectional shape and size of the edge counterweight hole 3; the fixing plate 8 is fixedly connected to the extrusion body 7 by bolts, and a screw hole coaxial with the forming cavity 13 is provided on the fixing plate 8, and the extrusion rod 9 is threadedly connected to the fixing plate 8 by the screw hole, and an extrusion head 10 equal to the cross-sectional shape and size of the forming cavity 13 is provided at the end of the extrusion rod 9. The extrusion head 10 has an axial limit relative to the extrusion rod 9, but can rotate relative to the extrusion rod 9, ensuring that when the extrusion rod 9 is rotated and fed, the extrusion head 10 does not rotate, but is only fed under the drive of the extrusion rod 9. The connection method between the extrusion head 10 and the extrusion rod 9 is well known to those skilled in the art, and this embodiment will not be repeated. When in use, the lead wire can be placed in the forming cavity 13 , the extrusion rod 9 can be rotated, and the lead wire can be extruded into a counterweight block that matches the shape of the forming cavity 13 using the extrusion head 10 .

[0041] In order to facilitate the screwing of the extrusion rod 9 , a screwing handle 12 is further provided at the other end of the extrusion rod 9 in this embodiment.

[0042] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0043] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A blade counterweight support, characterized in that: It includes a support body, which is a rotating body and is used to be fixed at the root of the blade; the support body is provided with: A central counterweight hole, wherein the central counterweight hole is coaxially arranged with the support body; And edge counterweight holes, there are multiple edge counterweight holes, and they are evenly arranged around the periphery of the central counterweight hole; the radial cross-section of the edge counterweight hole is a nearly trapezoidal shape, and the nearly trapezoidal shape includes an inner edge, an outer edge and a waistline, the inner edge and the outer edge are both arc-shaped shapes concentric with the support body, the two waistlines have the same length, and the two waistlines respectively connect the end points of the inner edge and the outer edge.

2. The blade counterweight support according to claim 1, characterized in that: The connection position between the inner edge and the waistline and the connection position between the outer edge and the waistline are both provided with transition fillets.

3. The blade counterweight support according to claim 1, characterized in that: The hole depth of the central counterweight hole is greater than the hole depth of the edge counterweight hole.

4. The blade counterweight support according to claim 3, characterized in that: The bottom of the central counterweight hole and the bottom of the edge counterweight hole are both provided with air holes.

5. The blade counterweight support according to any one of claims 1 to 4, characterized in that: An annular limiting platform is also provided at the end of the support body, and the annular limiting platform is arranged at one end of the opening of the central counterweight hole; the annular limiting platform is used to abut against the carbon tube in the blade.

6. The blade counterweight support according to claim 5, characterized in that: The outer surface of the bottom of the edge weight hole is also provided with a latch, and the latch is used to be inserted into the foam core in the blade.

7. The blade counterweight support according to claim 6, characterized in that: The support body is injection molded by nylon material.

8. A weight balancing method for a blade weight support as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Inserting a weight wire or a weight bar into the central weight hole; A counterweight block is placed into the edge counterweight hole, and the cross-sectional shape of the counterweight block is equal to the shape and size of the edge counterweight hole.

9. The weight balancing method according to claim 8, characterized in that: The counterweight block is extruded by a counterweight block extrusion mechanism, and the counterweight block extrusion mechanism includes an extrusion body, a fixing plate and an extrusion rod; a molding cavity is arranged inside the extrusion body, and the cross-sectional shape and size of the molding cavity are equal to the cross-sectional shape and size of the edge counterweight hole; the fixing plate is fixedly connected to the extrusion body, and a screw hole coaxial with the molding cavity is arranged on the fixing plate, and the extrusion rod is threadedly connected to the fixing plate through the screw hole, and an extrusion head equal to the cross-sectional shape and size of the molding cavity is arranged at the end of the extrusion rod.

10. The weight balancing method according to claim 9, characterized in that: The other end of the extrusion rod is also provided with a screwing handle.

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