Threshing apparatus for general-purpose combine harvester

Abstract

To provide a thresher to be mounted on a general-purpose combine harvester, designed to facilitate the replacement and repair of worn threshing teeth so as to favorably maintain the threshing efficiency of a threshing cylinder.SOLUTION: In a threshing cylinder 11 composed of an impeller 31 provided with a conveying spiral 43 and a rotor 32 having threshing teeth 14 erected thereon, a circular arc threshing cylinder 47 having the threshing teeth 14 detachably erected thereon is cylindrically assembled between a rear plate 41 of the impeller 31 and a rear plate 46 of the rotor 32 to constitute the rotor 32, and the circular arc threshing cylinder 47 is separated from the rotor 32 to enable the exchange of the threshing teeth 14.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a threshing drum of a threshing device mounted on a general-purpose combine harvester. [Background technology]

[0002] As described in JP 2008-263913 A, a general-purpose combine harvester uses a pre-harvesting device to harvest stalks growing in a field, then feeds the stalks into a threshing device to thresh and separate the grains, which are then stored in a grain tank for harvesting, and discharges the threshed waste stalks back into the field.

[0003] The threshing device mounted on the general-purpose combine has a threshing drum with threshing teeth attached to its outer periphery, supported on a shaft within the threshing chamber. The harvested stalks are sent backward between the threshing drum and a threshing net attached to the lower half of the threshing drum, where they are threshed by the threshing teeth. The threshed grain containing the grains then falls from the threshing net onto the oscillating sorting device below, where the grains are sorted. The grains are then collected in a grain tank and harvested. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-263913 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional general-purpose combine harvester, the threshing drum, which is journaled within the threshing drum of the threshing device, has six cylindrical frames arranged parallel to the drive shaft on the front and rear threshing drum side panels, with threshing teeth radially arranged around the outer periphery of the cylindrical frames. The threshing drum threshes the harvested stalks sent into the threshing chamber between the threshing teeth and the threshing net, which tends to reduce threshing efficiency by causing the threshing teeth to wear out and become shorter, or the threshed grain to get stuck inside the six cylindrical frames and become lodged.

[0006] The present invention aims to provide a threshing device mounted on a general-purpose combine that makes it easy to replace and repair worn threshing teeth in order to maintain good threshing efficiency of the threshing drum. [Means for solving the problem]

[0007] The above-mentioned object of the present invention is achieved by the following technical means.

[0008] The invention of claim 1 is a threshing device for a general-purpose combine, characterized in that in the threshing drum 11, which is composed of an impeller 31 with a conveying spiral 43 and a rotor 32 with threshing teeth 14 erected thereon, the rotor 32 is formed by assembling a cylindrical arc-shaped threshing drum 47, with the threshing teeth 14 erected in a removable manner, between the rear plate 41 of the impeller 31 and the rear plate 46 of the rotor 32, and the arc-shaped threshing drum 47 can be separated to enable the threshing teeth 14 to be replaced.

[0009] The invention of claim 2 is a threshing device for a general-purpose combine as described in claim 1, characterized in that the spacing in the axial direction of the threshing body of the threshing teeth 14 erected on the rotor 32 is wider at the front and narrower at the rear.

[0010] The invention of claim 3 provides a threshing device for a general-purpose combine according to claim 1 or 2, characterized in that the plurality of threshing teeth 14 are integrally detachable from the arc-shaped threshing body 47. [Effects of the Invention]

[0011] In the invention of claim 1, multiple arc-shaped threshing drums 47 are combined to form a single threshing drum 11, so that they can be disassembled into relatively small arc-shaped threshing drums 47 within the threshing chamber and replaced with new parts, making it easy to update the threshing drums 11. Furthermore, the threshed grain sent into the threshing chamber of the threshing device is stirred by the threshing drum 11 and sent rearward, where it is threshed by the threshing teeth 14 of the threshing drum 11, but the threshed grain does not get inside the cylindrical threshing drum 11, and is sent rearward without being subjected to excessive threshing action by the arc-shaped outer peripheral surface of the arc-shaped threshing drum 47, allowing it to be threshed and discharged efficiently.

[0012] In the invention of claim 2, in addition to the effect of claim 1, the stalks threshed by the threshing teeth 14 of the threshing drum 11 are not threshed strongly by the threshing teeth 14 with wide axial spacing at the front of the threshing drum 11, but are threshed gently by the threshing teeth 14 with narrow axial spacing at the rear, which reduces the resistance of the stalks to being fed backward and allows the threshing action to be carried out smoothly.

[0013] In the invention of claim 3, in addition to the effects of claim 1 or 2, the plurality of handling teeth 14 can be removed as a unit from the arc handling body 47 and quickly replaced, making repair work quick and easy. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view of a combine harvester according to an embodiment of the present invention. FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is a longitudinal cross-sectional view of the threshing device of the combine harvester. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a perspective view of another arcing cylinder. [Figure 8] FIG. 1 is a partial perspective view of the threshing drum with the arc threshing drum removed. DETAILED DESCRIPTION OF THE INVENTION

[0015] As shown in Figures 1 to 3, a multi-purpose combine harvester has a traveling device 2 consisting of a pair of left and right crawlers that travels on the soil surface, mounted on the underside of a machine frame 1, a pre-harvesting device 3 that harvests stalks in the field, mounted on the front of the machine frame 1, a thresher 4 that threshers and sorts the harvested stalks, mounted on the rear left side of the pre-harvesting device 3, and a control unit 5 on which an operator sits, mounted on the rear right side of the pre-harvesting device 3. A solar panel 60 is mounted on the top surface of a cabin 59 surrounding the control unit 5, and electricity generated from sunlight is used to charge a battery.

[0016] An engine room 6 that houses the engine is provided below the control unit 5, a grain tank 7 that stores threshed and sorted grain is provided behind the control unit 5, and a discharge auger 8 that can be raised and lowered behind the grain tank 7 to discharge the grain to the outside.

[0017] The pre-harvesting processing device 3 is composed of a conveying device 3A that transports the stalks in the field to the rear while standing them up, a cutting blade device 3B that cuts the base of the stalks transported to the rear lower part of the conveying device 3A, an auger device 3C that gathers the stalks transported to the rear side of the conveying device 3A to the left side, and a feeder house 3D that transports the gathered stalks to the threshing device 4.

[0018] As shown in FIG. 4, the threshing device 4 is formed of a threshing chamber 10 for threshing stalks and a sorting chamber 20 for sorting the threshed grains.

[0019] A threshing drum 11 for threshing the stalks transported from the feeder house 3D is installed on the front and rear walls of the threshing chamber 10, and a receiving net 12 formed in a semicircular arc along the lower outer periphery of the threshing drum 11 is installed on the underside of the threshing drum 11. The upper part of the threshing drum 11 is covered with an openable threshing drum cover 13 (Fig. 3), and a dust conveying plate (not shown) for guiding the stalks to the rear of the threshing chamber 10 is installed on the inner periphery of the threshing drum cover 13.

[0020] Above the sorting chamber 20, there is provided a oscillating sorting device 21 which sorts grains leaking down from the handling chamber 10 using a transfer shelf 21a, a chaff sieve 21b, and a straw rack 21c. Below the oscillating sorting device 21, there are provided, in order from the front, a winnower 25 which blows sorting air to the oscillating sorting device 21, a wind divider 26 which changes the blowing direction of the sorting air behind the winnower 25, a first spiral 27 which transports grains leaking down from the oscillating sorting device 21 to the grain tank 7, and a second spiral 28 which re-transports grains with rachis branches and the like attached which leak down from the rear of the oscillating sorting device 21 to the sorting shelf at the front of the oscillating sorting device 21.

[0021] The handling chamber 10 has one of the left and right side walls that can be opened or closed, allowing maintenance of the handling drum 11 and the oscillating sorting device 21 inside to be performed through the open side wall.

[0022] A guide body 52 (Fig. 4) is provided on the inner surface of the non-opening side wall of the handling chamber 10, sloping inward from directly beside the handling drum 11 toward above the oscillating sorting device 21. This guide body 52 is made up of plates or plate materials or round bars arranged in a comb shape, and acts to slide down the discarded grain that escapes the receiving net 12 to the left-right center of the oscillating sorting device 21. The front-to-rear length of the guide body 52 should be matched to the overall length of the oscillating sorting device 21, but if there is a lot of discarded grain in the front, center, or rear, it may be limited to a width corresponding to the front-to-rear width of the transfer shelf 21a, chaff sieve 21b, or straw rack 21c.

[0023] The handling drum 11 is composed of a rotating shaft 30 that is rotatably supported on the front and rear walls of the handling chamber 10, a truncated cone-shaped impeller 31 attached to the front of the rotating shaft 30, and a cylindrical rotor 32 that extends to the rear.

[0024] The impeller 31 is formed from a disk-shaped front plate 40, a disk-shaped rear plate 41 with a larger diameter than the front plate 40, and a conical trunk plate 42 that connects the outer peripheries of the front plate 40 and the rear plate 41. A pair of upper and lower conveying spirals 43 are provided on the outer periphery of the trunk plate 42 to convey the stalks conveyed to the front part of the impeller 31 to the rear part of the impeller 31. This allows the stalks transferred to the impeller 31 to be efficiently conveyed from the front to the rear of the impeller 31 and handed over to the rotor 32.

[0025] On the front surface of the conveying spiral 43, approximately triangular reinforcing ribs 44 are provided at a predetermined angle in the circumferential direction to connect the side plate 42 and the lower front surface of the conveying spiral 43. This increases the rigidity of the conveying spiral 43 and makes it possible to suppress deformation of the conveying spiral 43 due to the load applied to the conveying spiral 43 from the stalks.

[0026] The rotor 32 is connected between the rear plate 41 of the impeller 31 and the disk-shaped rear plate 46 of the threshing drum 11 by six equally spaced support beams 48 made of steel bands. A circular arc threshing drum 47, which is a cylinder divided into circular sections at 60° intervals, is detachably connected to the support beams 48 with bolts. A threshing tooth mounting plate 17 with six threshing teeth 14 is attached to the inner surface of the threshing drum 47 with the threshing teeth 14 protruding outward. The threshing tooth mounting plate 17 can be removed to replace all six threshing teeth 14 at once. The threshing tooth mounting plate 17 may also be attached by adhering it to the outer surface of the threshing drum 47. Furthermore, a plate-shaped spring-out plate 49 is attached diagonally to the threshing tooth mounting plate 17 on the disk-shaped rear plate 46 side to facilitate easier grain discharge.

[0027] 6 and 7 show the arcuate threshing drum 47 from front to rear, and although the threshing teeth 14 are shown spaced evenly in the front-to-rear direction, if the spacing between the threshing teeth 14 on the front threshing tooth mounting plate 17 is wide and the spacing on the rear threshing tooth mounting plate 17 is, for example, half the pitch of the front threshing teeth 14, doubling the number of threshing teeth 14, the threshing action of the grain will become stronger from front to rear, resulting in smoother rearward feeding. Note that the spacing between the threshing teeth 14 may be narrower at the front and wider at the rear, wider at the front and rear and narrower in the middle, or alternately narrow and wide, depending on the characteristics of the stalk.

[0028] Furthermore, fragmentation of the stalks can be reduced by tilting the threshing teeth 14 backward and protruding in the direction of rotation of the threshing drum 11. Furthermore, it is advisable to attach a reinforcing material to the rear side of the threshing teeth 14.

[0029] Figure 8 shows the handling drum 11 with the arc handling drum 47 removed, and shows that annular reinforcing rings 50 are welded to six support beams 48 at predetermined intervals to withstand the external pressure applied to the cylindrically assembled arc handling drum 47. The reinforcing ring 50 is divided into six parts around its circumference and connected in an annular shape with bolts 51, so when separated it can be removed together with the support beams 48.

[0030] The receiving net 12 is a net that surrounds the lower half of the handling drum 11 in an arc shape, and can be removed from the handling chamber 10 as needed to perform maintenance. [Explanation of symbols]

[0031] 11 Thrusting body 14 Teeth Treatment 31 Impeller 32 rotor 41 Rear plate 43 Conveying spiral 46 Rear plate 47 Circular Handling Body

Claims

1. In the threshing drum (11) composed of an impeller (31) provided with a conveying spiral (43) and a rotor (32) on which threshing teeth (14) are erected, a circular arc threshing drum (47) on which threshing teeth (14) are removably erected is assembled in a cylindrical shape between the rear plate (41) of the impeller (31) and the rear plate (46) of the rotor (32) to form the rotor (32), and the circular arc threshing drum (47) can be separated to enable replacement of the threshing teeth (14).

2. 2. A threshing device for a general-purpose combine according to claim 1, wherein the threshing teeth (14) erected on the rotor (32) are arranged such that the spacing in the axial direction of the threshing body is wider at the front and narrower at the rear.

3. 3. A threshing device for a general-purpose combine according to claim 1 or 2, characterized in that a plurality of threshing teeth (14) are detachably attached to the arc-shaped threshing body (47) as a single unit.

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