Harvester fan structure
The harvester fan structure addresses instability and high replacement costs by using a fan shaft with uniformly spaced holding units and reinforced slots, enabling quick and easy blade replacement.
Patent Information
- Application Number
- IR140050140003007730
- Authority / Receiving Office
- IR · IR
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2021-04-27
- Filing Date
- 2022-01-01
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2042-01-01
AI Technical Summary
The existing harvester fan structures in crawler combines suffer from poor strength, complex replacement processes, and high costs due to manual welding issues leading to desoldering and instability during high-speed rotation.
A harvester fan structure with a fan shaft connected to bearings in a fixed frame, featuring uniformly spaced holding units with fan blades secured by screwing onto fan blade supports that form a polygon around the shaft, and reinforced by a plate welded into slots on the shaft to prevent slippage.
The new structure provides a stable and easily disassemblable fan design, reducing maintenance complexity and resource waste by allowing quick and simple replacement of fan blades.
Smart Images
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Abstract
Description
Description Harvester fan structure Technical background This invention relates to the technical field of agricultural machinery, in particular the structure of the harvester mechanism. Context The threshing system of a crawler combine can be divided into a longitudinal axis flow threshing and cleaning system and a horizontal axis flow threshing and cleaning system, and these two forms of threshing and cleaning systems are the main structural forms currently used in the market. The inside of the harvester is mainly divided into a threshing system, a screening system and a wind selection system from top to bottom. The role of the wind selection system is to continuously blow wind to the end of the harvester. The wind is blown through the falling crop grain area and the mesh screen surface in the screening system, and the grass, stubble and other miscellaneous debris that are lighter than the crop grain are blown out into an opening at the end of the harvester to collect the crop grain with a high degree of cleanliness. In the current wind selection system, each fan blade in the fan is fixed to the fan shaft by welding, which is affected by the manual welding process and can easily lead to desoldering or even failure of welding, which creates an unstable fan structure and safety hazards under high-speed rotation. When the fan blade breaks, the process of replacing the fan blade becomes complicated and costly, resulting in a waste of resources. Summary Therefore, the technical problem to be solved in this invention is to overcome the problems of poor strength, tedious replacement processes, and high cost of fan blades in the prior art. To this end, this invention provides a harvester fan structure that includes the following: A fan shaft, the two ends of which are respectively connected to two bearings located in a fixed frame. A large number of holding units fixed to the fan shaft at uniform spacing. A large number of fan blades fixed on the holding units. Each storage unit includes the following: A number of fan blade supports screwed and locked to the fan shaft in sequence along the circumferential direction of the fan shaft, wherein the fan blades are screwed and fixed to the fan blade supports in sequence. All the fan blade supports enclose a polygon, and this polygon is tangent to a circle of the fan shaft cross section. All fan blade supports in each of the support units enclose a regular polygon. The fan blade supports are of a plate-like structure. The fan blade support is bent to form a fixed portion and a mounting portion. One end of the mounting portion is adapted to mount the fan blade. The angle α formed between the fixed portion and the mounting portion is the complement of the interior angle β of the regular polygon enclosed by the fan blade supports. The fixed part of one fan blade support is screwed and fixed to the mounting part of the other fan blade support. A flat slot is opened in the fan shaft corresponding to each holding unit, and one of the fan blade supports is fixed in the flat slot. The structure of the harvester fan also includes a reinforcement plate, and the reinforcement plate is welded and fixed in the slot of the bed. The fan blade support is fixed on the upper surface of the reinforcement plate. The thickness of the reinforcement plate is equal to the dimension of the depth of the slot in the bed, and the width of the reinforcement plate along the radial direction of the fan shaft is not greater than the diameter of the fan shaft. The width of the reinforcement plate is equal to the width of the flat slot in the radial direction of the fan shaft. The fan shaft is provided with a large number of flat slots. The flat slots are arranged one by one with the fan blade supports, and the fan blade supports are fixed in the flat slots respectively. The fan blades are fixed to two fan blade supports in two adjacent support units in a circumferential manner. The technical solutions of this invention have the following advantages: 1. The structure of the harvester fan provided in this invention includes a fan shaft, a plurality of holding units and a plurality of fan blades. The holding units are fixed at a uniform distance on the fan shaft. The fan blades are fixed on the holding unit. Each holding unit includes a plurality of fan blade supports, which are respectively screwed to and locked with the fan shaft along the circumferential direction of the fan shaft. All the fan blade supports enclose a polygon, and this polygon is tangent to a circle of the cross-sectional area of the fan shaft. A plurality of fan blade supports are fixed around the fan shaft with bolts and nuts. This structure is simple and stable, and the parts are convenient and quick to disassemble and replace. 2. In the case of the harvester fan structure provided in this invention, a flat slot is formed on the fan shaft, and the fan blade support is fixed in the flat slot. The restriction of the flat slot prevents relative slippage between the fan blade support and the fan shaft, which is caused by the low clamping force of the fan blade support fixed on the fan shaft. Brief description of the shapes In order to more clearly describe the technical solutions in the embodiments of this invention or the prior art, a brief introduction will be given below to the accompanying drawings that should be used in the description of the embodiments or in the prior art. It is clear that the figures described below are merely some of the embodiments of this invention. For those skilled in the art, other figures can be prepared in view of these figures without any creative effort. Figure 1 is a schematic diagram of a cross-section of a fan structure in an embodiment of the present invention. Figure 2 is a schematic structural diagram of a fan shaft in an embodiment of the present invention. Figure 3 is a three-dimensional diagram of the fan structure in an embodiment of the present invention. Reference numbers: 1i, fan shaft; 11i, flat slot; 2i, fan blade; 3i, fan blade holder; 31i, mounting part; 32i, fixed part; 4i, reinforcement plate. Detailed description of the embodiments The technical solutions of this invention, in combination with the accompanying figures, are clearly and completely explained below, and it is clear that the described embodiments are part of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by persons skilled in the art without any creative effort are within the scope of protection of this invention. In describing this invention, it should be noted that the orientation or positional relationship indicated by terms such as “center,” “top,” “bottom,” “left,” “right,” “vertical,” “horizontal,” “inside,” “outside” is the orientation or positional relationship based on the accompanying figures. Such terms are merely for convenience in explaining this invention and simplifying the description and are not intended to indicate or imply that the device or part in question must be located in a particular orientation or must be constructed or operated in a particular orientation. Therefore, these terms should not be construed as a limitation on this invention. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In explaining this invention, it should be noted that unless otherwise specified and defined, terms such as "mounted", "connected" and "connection" should be understood in their broad sense, for example, the connection can be a fixed connection, a detachable connection or an integral connection, a mechanical connection or an electrical connection, a direct or indirect connection through an intermediary and a connection between two parts. For those skilled in the art, the specific meanings of the above terms in this invention can be understood with regard to the specific circumstances. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as no conflict arises between them. Visualization 1 This embodiment provides a harvester fan structure. As shown in Figure 3, the harvester fan structure includes a fan shaft 1i, a number of support units and a number of fan blades 2i, where the support units are fixed to the fan shaft 1i at a uniform distance. The fan blades 2i are fixed on the support units. As shown in Figure 1, each support unit includes a number of fan blade supports 3i, which are respectively bolted and locked to the fan shaft 1i along the circumferential direction of the fan shaft 1i. The fan blades 2i are respectively bolted and fixed to the fan blade supports 3i. In this embodiment, the fan blade supports 3i are of a plate-like structure. The fan blade support 3i is bent to form a fixed portion 32i and a mounting portion 31. In the same holding unit, the fixed portion 32i of one fan blade support 3i is screwed and fixed to the mounting portion 31i of the other fan blade support 3i. A plurality of fan blade supports 3i are connected end-to-end in order to enclose a polygon in the circumferential direction of the fan shaft 1i, and this polygon is tangent to the circle of the cross-sectional area of the fan shaft 1i. The plurality of fan blade brackets 3i are fixed around the fan shaft 1i with bolts and nuts. This structure is simple and stable, and the parts are easily and quickly disassembled and replaced. All the fan blade supports 3i in each of the support units enclose a regular polygon, and the angle α formed between the fixed portion 32i and the mounting portion 31i is the complement of the internal angle β of the regular polygon. As shown in Fig. 1 or 3, in this embodiment, there are four fan blade supports 3i in each support unit. The fixed portion 32i and the mounting portion 31i in each fan blade support 3i are arranged at right angles and together enclose a square tangent to the circle of the cross-sectional area of the fan shaft 1i. In this embodiment, as shown in FIG. 2, a flat slot 11i is formed on the fan shaft 1i corresponding to each holding unit, and a reinforcing plate 4i is welded into the flat slot 11i. The thickness of the reinforcing plate 4i is equal to the depth of the groove of the flat slot 11i, that is, the upper surface of the reinforcing plate 4i is tangent to the circle of the cross-sectional area of the fan shaft 1i. The width of the reinforcing plate 4i along the radial direction of the fan shaft 1i is not larger than the diameter of the fan shaft 1i. This is to prevent it from being larger than the length of the side of the square enclosed by the fan blade support 3i, which makes assembly impossible. In this embodiment, the width of the reinforcing plate 4i is equal to the width of the flat slot 11i. The flat gap restriction 11i prevents relative slippage between the fan blade support 3i and the fan shaft 1i, this slippage being caused by the low clamping force of the fan blade support 3i which is fixed on the fan shaft 1i. As shown in Fig. 3, in this embodiment, four support units are spaced apart on the fan shaft 1i. Four fan blades 2i are mounted on two support units located on the left side. The fan blades 2i are of a sheet-like structure, and each fan blade 2i connects two support units and is screwed and fixed to the mounting portion 31i of two fan blade supports 3i. The fan blades 2i mounted on the two support units on the right side are the same as the fan blades on the left side, and a specific structure is not repeated here in abundance. The fan blades 2i on the left and right sides form two groups of fan structures side by side, which can create more air inlet channels between the two groups of fan structures, and as a result, the fan provides uniform air in a large environment. As a first alternative implementation of embodiment 1, a plurality of flat slots 11i can be formed on the fan shaft 1i. The flat slots 11i are in one-to-one communication with the fan blade supports 3i, and the fan blade supports 3i are directly inserted into the flat slots 11i. The flat slots 11i are respectively screwed end-to-end onto the fan shaft 1i and locked. As a second alternative embodiment of embodiment 1, when a holding unit is formed correspondingly to a flat slot 11i on the fan shaft 1i, a reinforcing plate 4i is welded and fixed to one of the fan blade supports 3i in the holding unit. The reinforcing plate 4i is fitted in the flat slot 11i to restrict the fan blade support 3i in the axial direction of the fan shaft 1i. The remaining fan blade supports 3i in the holding unit and the fan blade supports 3i of the welded reinforcing plate 4i are jointly enclosed and restricted on the fan shaft 1i. It is understood that the above embodiments are only for the purpose of clearly explaining the described examples, and not to limit the embodiments. Those skilled in the art can make other changes or modifications in various ways based on the above description. It is not necessary or impossible to enumerate all the embodiments here. Changes or modifications that are obvious from these embodiments are still within the scope of the invention.
Claims
Amended Claims 1. The structure of the harvester fan includes: a fan shaft (1i) whose two ends are respectively fixed to two bearings located in a frame. a plurality of holding units fixed to the fan shaft (1i) at a uniform distance. a plurality of fan blades (2i) fixed to the holding units. Each of the holding units includes: a plurality of fan blade supports (3i), respectively screwed and locked to the fan shaft (1i) along the circumferential direction of the fan shaft (1i), in which the fan blades (2i) are respectively screwed and fixed to the fan blade supports (3i). All the fan blade supports (3i) enclose a polygon, and the polygon is tangent to a circle of the cross-sectional area of the fan shaft (1i) from the outside; wherein a flat slot (11i) is formed in the fan shaft (1i) corresponding to each of the support units; and one of the fan blade supports (3i) is fixed in the flat slot (11i) to prevent relative sliding between the fan blade support and the fan shaft.
2. The structure of the harvester fan according to claim 1 is characterized in that all the fan blade supports (3i) in each of the support units include a regular polygon.
3. The characteristic of the structure of the harvester fan according to claim 2 is that the fan blade supports (3i) have a plate-like structure.
4. The structure of the harvester fan according to claim 3 is characterized in that the fan blade support (3i) is bent to form a fixed portion (32i) and a mounting portion (31i). The end of the mounting portion (31i) is adapted to mount the fan blade. The angle α formed between the fixed portion (32i) and the mounting portion (31i) is the complement of an interior angle β of a regular polygon enclosed by the fan blade supports (3i).
5. The structure of the harvester fan according to claim 4 is characterized in that the fixed portion (32i) of one of the fan blade supports (3i) is screwed and fixed to the mounting portion (31i) of the other fan blade support (3i).
6. The structure of the harvester fan according to claim 1 is characterized in that it comprises: a reinforcing plate (4i) is welded and fixed in the slot of the flat (11i). The fan blade support (3i) is fixed on the upper surface of the reinforcing plate (4i). The thickness of the reinforcing plate (4i) is equal to the dimension of the slot depth in the flat (11i), and the width of the reinforcing plate (4i) along the radial direction of the fan shaft (1i) is not greater than the diameter of the fan shaft (1i).
7. The characteristic of the structure of the harvester fan according to claim 6 is that the width of the reinforcing plate (4i) is equal to the width of the flat slot (11i) in the radial direction of the fan shaft (1i).
8. The structure of the harvester fan according to any one of claims 1-5 is characterized in that the fan shaft (1i) is provided with a plurality of flat slots (11i). The flat slots (11i) are arranged one by one with the fan blade supports (3i), and the fan blade supports (3i) are respectively fixed in the flat slots (11i).
9. The structure of the harvester fan according to any one of claims 1-5 is characterized in that the fan blades (2i) are fixed to two fan blade supports (3i) in two adjacent holding units in a circumferential manner.