JPS6344Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a threshing device for a DC type combine harvester, and is configured to perform two-stage threshing processing with different threshing actions using one handling drum.

By the way, in this type of threshing device, if the threshing action is strengthened by rotating the handling drum at high speed, etc., the shedding rate increases, and conversely, if the threshing action is weakened by rotating the handling drum at low speed, etc., the shedding rate increases. While this decreases, there is a problem in that the amount of unused items increases. To solve this problem, two handling drums with different rotation speeds are installed, and the slow-speed handling cylinder first threshes the grain without causing threshing, and then the high-speed handling cylinder disposes of the remaining grain culm. However, equipping two handling torsos like this inevitably leads to an increase in the size of the aircraft, complicates the structure of various parts including the transmission system, and has other disadvantages such as high costs. It is coming.

The present invention was developed in view of these circumstances, and the central part of the handling drum is a small-diameter primary threshing part, and both sides thereof are large-diameter secondary threshing parts, and the handling drum is mounted on a shaft. In the handling chamber, the grain culm is supplied from the front central entrance to the lower part of the primary threshing section of the handling drum, and is then circulated upward from the rear of the handling drum and spread to both sides. By providing a guide member below the next threshing section, the threshing process can be performed in two stages with one handling drum at different circumferential speeds. This is designed to reduce the evasion rate and prevent unhandled items without causing negative effects such as an increase in size.

This will be explained below using an example. In FIG. 1, 1 is the body of a DC type combine harvester, 2 is a reaping section installed at the front part of the body, which includes a weed divider 3, a pulling reel 4, and a cutting blade 5. 6 is an auger that collects the harvested grain culm in the center, and 7 is an auger that collects the harvested grain culm in the center.
is a conveyor that carries this into the handling chamber 8 from the entrance 8a at the center of the front part thereof. Reference numeral 9 denotes a handling barrel mounted on a shaft within the handling chamber 8, 10 a receiving net disposed along the lower surface thereof, and 11 a beater for discharging straw provided at the outlet 8b at the rear of the handling chamber. Reference numeral 12 denotes a sorting section at the rear of the handling room 8, which includes a straw walker 13 extending from below the handling room outlet 8b to the rear of the fuselage, a chaff sheave 14 and a grain sieve 15 disposed below it.
At the bottom of the sorting section, there is a first screw conveyor 18 for transporting the sorted grains to the grain tank 17, and a second screw conveyor 18 for transporting the sorted grains to the grain tank 17, and a conveyor for conveying the second grains that need to be reprocessed. A No. 2 screw conveyor 19 is provided that returns the liquid to the handling room 8 or a separately provided processing room (not shown). As shown in FIGS. 2 and 3, the handling barrel 9 has a small-diameter primary threshing section 9a at the middle part, and a large-diameter secondary threshing section 9a, 9b at both sides thereof. A receiving net 10 stretched along the lower surface of the handling drum
Also, in order to maintain a constant clearance with the peripheral surface of the handling drum, the primary threshing section 10a has a raised center part, and the secondary threshing parts 10b, 10b have lowered sides thereof. In addition, inside the handling chamber 8 in which the handling barrel is mounted, the rear center corresponding to the entrance 8a in the front center is closed by a guide member 8c, and the grain culms passing under the center of the handling barrel are The grain culms are arranged to circulate upward along the inner surface, and on the inner upper surface of the chamber, there are a plurality of diffusion holes for guiding the grain culms, which have been rotated upward at the center of the rear part, to the front while spreading them to both sides. Guide members 8d...8d are provided symmetrically. Here, the guide member 8c
Since the center of the rear of the handling chamber is closed, two outlets 8b, 8b of the chamber are provided on both sides of the rear, and the beaters 11, 11 are connected to the outlets 8b, 8b, respectively.
is equipped.

Further, in the illustrated embodiment, the primary of the handling cylinder 9,
A toothed type threshing member 9' made of wire is used in the secondary threshing section, but other types include rasp type,
A spike type threshing member or the like may be used, and in that case, the type of the member may be different between the primary and secondary threshing sections. Furthermore, the type of the receiving net 10 may be appropriately selected depending on the type of the grain-shredding member in the handling cylinder.

According to the above configuration, from the reaping section 2 to the conveyor 7
Grain culm carried into the handling chamber 8 is supplied from the entrance 8a at the center of the front part of the chamber between the primary threshing section 9a at the center of the handling drum 9 and the primary threshing section 10a of the receiving net 10. The primary threshing process is carried out by the guide members 8c and 8d, and the upper part of the handling drum is guided forward while being spread to the left and right sides, and the secondary threshing section 9 is again located on both sides of the handling drum.
b, 9b and the secondary threshing part 10b, 1 of the receiving net 10
The second threshing process is carried out during this time, and after that, the grain is discharged from the outlets 8b and 8b onto the straw walker 13 outside the handling room by the action of the beater 11. . However, the primary threshing section 9a of the handling drum 9 has a small diameter, and the secondary threshing section 9 has a small diameter.
Since b has a large diameter, the circumferential speed of the threshing member (handling blade) 9' that threshes the grain culm is slow in the former case and fast in the latter case, so that the grain culm is first threshed during primary threshing. Due to the relatively gentle threshing action, the kernels are threshed without threshing, and the grain culms left untreated during the primary threshing are reliably threshed due to the strong threshing action during the secondary threshing. This will prevent unhandled items from being left unhandled without increasing the evasion rate.

As described above, the present invention provides a threshing device for a DC combine harvester in which the central part of the handling barrel is a small-diameter primary threshing part, the sides of the barrel are large-diameter secondary threshing parts, and the front part is installed inside the handling chamber. Grain culms that have passed below the primary threshing part of the handling cylinder from the entrance in the center of the handling cylinder are guided forward while being spread to both left and right sides above the handling cylinder, and are again supplied to the lower part of the secondary threshing part of the handling cylinder. Since the guide member is provided, the grain culm is threshed in two stages, first by a relatively gentle threshing action and then by a strong threshing action, by changing the circumferential speed of the threshing member using one handling cylinder. As a result, it is possible to reduce the shedding rate and prevent unhandled grains, so that good threshing can be performed at all times.In particular, according to the present invention, two handling drums are installed. This has the advantage that it does not have the disadvantages of increasing the size of the aircraft, complicating its structure, and increasing costs, as would be the case.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical cross-sectional side view of a combine harvester showing an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional plan view of the main part of the same embodiment, and Fig. 3 is a longitudinal cross-section of the main part taken along the line shown in Fig. 2. It is a front view. 8... Handling room, 8a... Entrance, 8b... Exit, 8
c, 8d...guiding member, 9...handling cylinder, 9a...primary threshing section, 9b...secondary threshing section.

Claims (1)

[Scope of utility model registration request] The central part of the handling drum is a small-diameter primary threshing part, and the sides thereof are large-diameter secondary threshing parts. A guide member is provided for causing the grain culms to circulate upward from the rear of the handling drum, spread from the center of the rear part of the handling chamber to both sides of the front part, and supply them again to the lower part of the secondary threshing part of the handling drum. Combine threshing equipment featuring: