JPH0715396Y2 - Straw cutting device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a combine cutting straw cutting device for cutting threshing culms. More specifically, the present invention relates to a straw cutting device capable of changing the cutting length of culm.

[Prior art]

In the combine harvester, the straw discharged from the threshing machine is guided to the straw cutting device provided at the rear of the machine to cut the length of the culm.

Generally, the straw by this straw cutting device is selectively cut into a short cut state in which it is cut short and a long cut state in which it is cut long, and the straw in this short cut state is spread evenly over the field. After that, it is plowed into the soil by plowing and used as organic fertilizer.The cut straw is packed in a baler after drying and used as livestock feed or straw for livestock. Therefore, it is required that the straw cutting device can change the cutting length by a simple operation.

[Problems that the device tries to solve]

In order to meet this demand, for example, Japanese Utility Model Laid-Open No. 61-80639 has been proposed as a 4-axis type. In this 4-axis type, a large-diameter disk is provided so that the phase-shift angle can be adjusted and fixed around the central axis, facing a low-speed rotating cylinder having a plurality of disk-shaped cutting blades arranged in a short pitch. By selectively polymerizing a plurality of (three) high-speed rotary cylinders, which are respectively provided at the three-divided positions of the large-diameter disk and have different pitches of the disk-shaped cutting edges, on the low-speed rotary cylinder, The cutting length of the is made into a short cut state, a middle cut state, and a long cut state, but it requires a large-diameter disk equipped with multiple high-speed rotating drums, and the whole straw cutting device is There was a drawback that it became large.

Further, Japanese Patent Laid-Open No. 62-96016, for example, has been proposed as a biaxial type device capable of downsizing the whole straw cutting device. This twin-screw type is provided with disc blades each having a small diameter and a large diameter and having different outer diameters alternately for each predetermined pitch on the scraping shaft.
A disk blade is provided for each predetermined pitch on one of the cutting shafts facing this, and this cutting shaft is swung about a fulcrum to selectively convert the degree of superposition of the cutting shaft side disk blade with respect to the scraping shaft side disk blade. By doing so, the cut length of straw can be converted into a short cut state or a long cut state.

However, even if this is not a problem in the long cut state, in the short cut state, the straw is first cut by the large diameter blades provided at coarse intervals Since it transforms in the vertical direction orthogonal to the axial direction of the rotating shaft and stands up, the small-diameter blades provided at closely spaced intervals do not cut short cuts and fall through the blades. However, there is a drawback that the culm that should be released in the short cut state is released in the long cut state.

In view of the above-mentioned conventional circumstances, the present invention has been devised to solve these problems, and provides an culling cutting device that can be made compact as a whole and that can improve the accuracy of the short cut state. It is carried out for the purpose.

[Means for solving problems]

The present invention that achieves the above object has an upper shaft provided with coarsely spaced disc blades and a lower shaft provided with closely spaced disc blades, which are vertically rotatable at a height such that the disc blades do not overlap with each other. Set up
A swing shaft equipped with closely spaced disc blades that selectively overlap with either one of the two disc blades is rotatably attached to a swing arm that is swingably fixed around a rear fulcrum shaft. It is a support.

[Action]

Therefore, the disc blades 22 with the close spacing S provided on the swing shaft 23 that can be swingably fixed about the fulcrum shaft 25 on the rear side are attached to the upper shaft 17
The straw is cut into long slices by superimposing it on the disc blades 16 with a rough spacing L provided by the above, but by superimposing it on the disc blades 19 with a fine spacing S provided on the lower shaft 20. , Straw is cut into short cuts.

Then, when the disc blade 22 of the swing shaft 23 overlaps with the disc blade 19 of the lower shaft 20, the upper shaft located above the lower shaft 20 in the short cutting state.
Since the disk blade 16 of 17 is also used as a standing tool for the straw to be cut, the standing state of the culm is prevented and the accuracy of the short cut state is improved.

Further, since the swing shaft 23 having the disc blade 22 may be simply swung up and down around the fulcrum shaft 25 on the rear side, the length of the straw cutting device 15 can be shortened and the entire structure can be downsized. To be done.

When the swing shaft 23 is swung to the retracted position Z further rearward than the short cut position Y, the disc blade 22 provided on the swing shaft 23 causes the disc blades 16 and 19 provided on the upper and lower shafts 17 and 19, respectively. Since the rear cover 47 is largely opened to the rear side, and the rear cover 47 is widely opened, it is possible to easily perform the removal work when the straw is clogged between the disc blades, and further maintenance of the inside of the straw discharge device 15 Can be done efficiently.

〔Example〕

Hereinafter, the drawings showing the present invention as an embodiment will be described.

As shown in FIGS. 6 to 7, the combine C is a threshing device 2 mounted on a machine base having a pair of left and right crawlers 1.
A pretreatment device 3 provided on the side of the machine body and controlled to move up and down around a fulcrum shaft (not shown) is provided in front of the pretreatment device 3. The pretreatment device 3 includes a carding mechanism 4 for raising a napped culm, A machine on the side of the threshing device 2 is configured by a cutting blade (not shown) for mowing the culms that have been carded, a transport mechanism 5 that conveys the harvested culms to the supply port (not shown) of the rear threshing device 2 and the like. A driver's seat 6 is arranged on the table.

On the front surface of the threshing device 2, a grain culm sandwiching and transporting mechanism 9 including a feed chain 7 and a sandwiching rail (not shown) is provided, and the transporting start end side of the grain stalks sandwiching transporting mechanism 9 is It is linked to the end side of the transport mechanism 5. The grain culm, whose stock is pinched by the grain culm sandwiching and conveying mechanism 9, is threshed by a handling cylinder (not shown) on its tip side while moving on the front surface of the threshing device 2, and then discharged from the discharge port.

At the discharge port of the threshing device 2, there is provided a straw sandwiching / conveying mechanism 10 whose starting end side is connected to the end side of the feed chain 7, and the sandwiching / conveying mechanism 10 has a scooping cutting device 15 to be described later in plan view. A straw chain (11) extending obliquely rearward toward the approximate center of the width, and a transport rail (12) arranged below the straw chain (11).

Behind the dust-exhausting chamber of the threshing device 2, there is attached a waste-cutter cutting device 15 for simultaneously cutting the straw that is sandwiched and transported by the straw-sandwiching and transporting mechanism 10 over the lengthwise direction. An opening / closing plate 13 is provided on the upper wall of the device 15 to open and close below the straw chain 11 around the fulcrum shaft 13a. The opening / closing plate 13 moves upward (open position (solid line position in FIG. 1)). ), The straw is supplied to the culm cutting device (15), so that the straw is cut into short cuts or long cuts in the culm direction, and is dropped and scattered in the field as the machine advances.

In addition, the closed state in which the opening / closing plate 13 moves downward (the position indicated by the chain line in FIG. 1)
Since the culm cutting device 15 is closed by the slaughter, the straw is not passed through the upper part of the culm cutting device 15 and is not cut.
It is dropped to the field from the end of 10.

The above-mentioned culm cutting device 15 is configured as shown in FIGS. That is, the upper shaft 17 having a large number of disc blades (cutting blades) 16 arranged at the rough intervals L, and the upper shaft 17
And a lower shaft 20 having a large number of disc blades (cutting blades) 19 disposed underneath and arranged at a close interval S, and rotatably supported by bearings 21 fixed to the left and right of the side wall 15a. Both axes
17, 20 are arranged vertically while maintaining a height T at which both disc blades 16 and 19 do not overlap with each other, and only the lower shaft 20 thereof is arranged behind the upper shaft 17 by a distance H. , It is easy to guide the straw during the short cut to the lower shaft 20.

A swing shaft 23 having a large number of disc blades (scraping blades) 22 arranged at a close interval S so as to selectively overlap with either one of the disc blades 16 and 19 is provided on each of the left and right side walls 15a. Fixed bearings 2
An intermediate shaft 25 rotatably supported by the shaft 4, that is, a swing shaft is provided so as to be fixed around the axis of the fulcrum shaft. In this way, the swing shaft 23 having the disc blade 22 may be simply swung up and down around the rear fulcrum shaft 25, so that the length of the straw cutting device 15 can be shortened and the entire structure can be made compact. There is an advantage that can be realized.

Using the intermediate shaft 25 as a fulcrum shaft, the long cutting position X, shown in FIG.
A pair of left and right swing arms 26 that can swing freely are provided across the swing positions of the short cut position Y and the retracted position Z.
The swing shaft 23 is rotatably supported on the swing side of 26.

The operation side of the switching lever 29, which is connected to the interlocking arm 27 formed integrally with the swing arm 26 via a connecting pin directed in the vertical direction, is provided movably along a guide guide hole 30 provided in the vertical direction. The guide guide hole 30 has a long cut position X locking hole at its lower end, a retracted position Z locking hole at its upper end, and a short cut position Y locking hole at its substantially intermediate position. Therefore, the culm cutting device 15 can be converted into the long cut state or the short cut state by a simple operation of moving the switching lever 29 along the guide guide 30.

An idle pulley 31 is rotatably positioned at the shaft end of the intermediate shaft 25, and a belt 34 is wound between the idle pulley 31 and a pulley 33 fixed to the drive shaft 32. Further, between the sprocket 35 fixed to the idler pulley 31 and the sprocket 36 fixed to the lower shaft 20, a conductive chain 37 and a lower shaft 20 are provided.
The conductive chain 41 is wound between the sprocket 39 fixed to the upper shaft 17 and the sprocket 40 fixed to the upper shaft 17, and the small diameter gear 43 fixed to the idle pulley 31 is the large diameter gear fixed to the swing shaft 23. It is configured to engage with the shaft 44 so that power can be transmitted even when the swing shaft 23 swings around the intermediate shaft 25.

A hook arm 45 and an extruding arm 50 are fixed to the intermediate shaft 25, respectively, and the other end of the spring 46 whose one end is locked to the hook arm 45 has the other end of the rear cover 47 hanging around the fulcrum shaft 13b. It is connected to a hook 49 fixed inside. In the pushing arm 50, when the switching lever 29 is moved to the retracted position Z of the guide guide hole 30, the rear cover 47 pushes back to the rear side of the chain line position around the fulcrum shaft 13a against the biasing force of the spring 46. To rotate.

[Effect of device]

As described above, according to the present invention, the closely spaced disc blades provided with the swing shafts that can be swingably fixed about the rear fulcrum shaft are superposed on the coarsely spaced disc blades provided on the upper shaft. By doing so, it is possible to cut the straw into a long-sliced state, and by superimposing on the disc blades of closely spaced intervals provided on the lower shaft,
You can cut straw into short cuts.

Moreover, when the disc blade provided on the swing shaft overlaps with the disc blade of the lower shaft in a short-cut state, the disc blade of the upper shaft located above the lower shaft is also cut and also serves as a stand-up preventer for straw. So
The standing state of the culm is prevented and the accuracy of the short cut state can be improved.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a side view of a straw cutting device, FIG. 2 is a plan development view showing a combined state of swing shafts, FIG. 3 is a side view of a transmission mechanism, and FIG. FIG. 4 is a plan development view of the transmission mechanism, FIG. 5 is a schematic view of an essential part, FIG. 6 is a plan view of the combine, and FIG. 7 is a side view of the combine. 2 ... Threshing device, 10 ... Straw sandwiching / conveying mechanism, 13 ... Open / close plate, 15
… Straw cutting device, 16… Disc blade (cutting blade), 17… Top shaft,
19 ... Disc blade (cutting blade), 20 ... Lower shaft, 22 ... Disc blade (scraping blade), 23 ... Oscillating shaft, 25 ... Support shaft, 26 ... Oscillating arm, 29 ...
Switching lever, 30 ... Guide guide hole, 45 ... Hook arm, 46
… Spring, 47… Rear cover, 50… Push arm.

Claims (1)

[Scope of utility model registration request] 1. An upper shaft having coarsely-spaced disc blades and a lower shaft having closely-spaced disc blades are rotatably arranged vertically at a height such that the disc blades do not overlap with each other. An oscillating shaft with closely spaced disk blades that selectively overlap with either of the two disk blades is rotatably supported by an oscillating arm that is rotatably fixed around a fulcrum shaft on the rear side. A device for cutting straw.