JP2502554Y2 - Lifting device for rear cutting blade in combine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device for a rear cutting blade in a combine in which a stump after mowing is cut at a lower position behind a mowing section.

[0002]

2. Description of the Related Art Conventionally, a mowing section having a main cutting blade and the like is vertically connected continuously in front of a threshing section through a feed chamber, and a rear cutting blade is vertically movable below the feed chamber. In the combine erected above, the rear cutting blade is configured to move up and down in conjunction with the up and down movement of the cutting unit. Therefore, there is a drawback that it is not possible to make adjustments such as cutting the stump after cutting with the main cutting blade of the cutting unit at a desired cutting height, and it is not possible to move only the rear cutting blade up and down or hold the position. .

In order to eliminate the above-mentioned drawbacks, Japanese Utility Model Application No. 62
As seen in No. 32337, the rear cutting blade is linked in an up-and-down movable manner by an actuator connected to the feed chamber, and the actuator is automatically stopped by the operation of the detection body that detects the upper and lower limit positions of the rear cutting blade. A vertical cutting blade vertical movement adjusting device has been devised which is characterized by being installed as described above.

[0004]

However, since the above-mentioned actuator operates at the same speed in both upward and downward movements, for example, the rear cutting blade plunges into the soil due to the protrusion of the field or the forward tilt of the combine. When that happens, even if the rear cutting blade starts moving upward, it will not be in time because the moving speed is slow,
There was a drawback that the rear cutting blade was plunged into the soil.

[0005]

Therefore, in the present invention, in the present invention, a mowing section equipped with a main cutting blade and the like is connected in a vertically movable manner in front of a threshing section provided on a machine frame through a feed chamber. In addition, in a combine with a rear cutting blade attached vertically below the feed chamber, an upper end of an actuator that can be expanded and contracted is attached to the feed chamber and the lower end of the actuator is extended rearward and downward, and The middle part of the rear cutting blade lifting operation lever is pivotally attached to the chamber, and the lower end of the rear cutting blade lifting operation lever is extended toward the front lower side,
While connecting the lower end of the rear cutting blade lifting operation lever and the lower end of the actuator, the upper end of the rear cutting blade frame extending forward and downward is pivotally supported on the machine frame so as to be vertically rotatable. A rear cutting blade is provided at the lower end of the cutting blade frame, and a connecting rod is provided between the middle portion of the rear cutting blade frame and the lower end of the rear cutting blade lifting operation lever. The purpose is to provide a lifting device for the cutting blade.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, A indicates a combine, and a body frame a is provided above a traveling unit 1 equipped with a crawler type traveling device. A feed chamber in which a threshing unit 2 and a sorting unit 3 are vertically arranged on the left side of the upper surface, an operating unit 4 is arranged on the right front side, and a Glen tank 5 is arranged on the rear side thereof, and a conveying mechanism is built in the front part of the threshing unit 2. The front end of the feed chamber 6 is vertically movable by connecting the rear ends of the feed chambers 6, and the main cutting blade 7, the scraping auger 8 behind the main cutting blade 7, and the reel portion 9 above the front are arranged at the front end of the feed chamber 6. A combine A is constructed by connecting the reaping units 10 that have been installed.

The feed chamber 6 is offset to the left from the machine center line in order to coincide with the grain culm entrance of the threshing section 2 arranged on the left side of the machine body, and is located between the mowing section 10 and the threshing section 2. Intervenes in.

A hydraulic cylinder 11 is interposed between the feed chamber 6 and the front part of the machine frame a, and the operation of the operating unit 4 causes the cylinder 11 to expand and contract to feed the feed chamber 6 into the same. Threshing section 2 for pivoting the rear end of chamber 6
Of the feed chamber 6 around the pivot 12 provided on the front of the
The front end and the reaping section 10 connected to the front end are vertically moved.

Further, at a position below the front end of the feed chamber 6 behind the cutting unit 10, as shown in FIGS. 2 and 3, a rear cutting blade 14 connected to the front end of a front low rear high rear cutting blade frame 13 is provided. Is provided and the base end of the frame 13 is rotatably pivotally attached to a support base 15 projecting from the front end of the machine body frame a so that the rear cutting blade 14 can move up and down. Upper surface of the feed chamber 6
Interlocking mechanism 16 and double-acting hydraulic cylinder 17
The rear cutting blade 14 is moved up and down by the expansion and contraction operation of the cylinder 17.

That is, on the right side surface of the feed chamber 6, a pivot shaft is provided.
18 is protrudingly provided, and the middle of the rear cutting blade lifting / lowering operation lever 19 which is inclined to the front low rear high is pivotally attached to the same pivot shaft 18 so that the lever 19 can rotate freely.
The forked portion 20 is formed at the lower end of the connecting rod 22, and the upper portion of the connecting rod 22 is slidably inserted into the lateral hole of the pin 21 which is rotatably inserted in the forked portion 20. A pin is pivotally attached to a clevis portion 24 projecting from a horizontal frame 23 provided laterally at the front end of the rear cutting blade frame 13.

Further, the forked portion of the lever 19 for raising and lowering the rear cutting blade
The piston rod end 17a of the double-acting hydraulic cylinder 17 is pin-pivotally attached to the outside of the pin 20 and slightly forward of the insertion position of the pin 21, and the cylinder head end 17b of the cylinder 17 is attached to the right outer surface of the feed chamber 6. Pin is pivotally attached to the front end.

Therefore, the double-acting hydraulic cylinder 17 is inclined forward and rearwardly low, and intersects the rear cutting blade elevating / lowering lever 19 which is inclined frontward and rearward and rearward at a substantially right angle.

In this way, the rear cutting blade elevating operation lever 19 is smoothly and surely rotated up and down in conjunction with the expansion and contraction operation of the piston rod of the double-acting hydraulic cylinder 17 to connect the rear cutting blade frame 13. By smoothly and reliably moving up and down through the rod 22, the rear cutting blade 14 attached to the front end of the rear cutting blade frame 13 can be smoothly and reliably moved up and down to ensure that the rear cutting blade 14 is thrust into the soil. So that it can be prevented.

The double-acting hydraulic cylinder 17 is connected to the hydraulic circuit shown in FIG. 5 and controlled by an electromagnetic hydraulic valve, and the port 31 on the piston rod side of the cylinder 17 is connected to the hydraulic valve 30. Connected to the drive side port 32, and the cylinder head side port 33 of the same cylinder 17 is connected to the lower side port 34 of the hydraulic valve 30.
It is configured to switch the flow path of the hydraulic valve (30) by operating the solenoids 35 and 36.

In the figure, P is a constant displacement hydraulic pump, 37, 37.
Is a choke for adjusting the operating speed, 38 and 38 are check valves with pilots, and double-acting hydraulic cylinders when the solenoid hydraulic valve 30 is neutral.
It is for hydraulically locking the 17.

Reference numerals 39, 40, 41 and 42 denote hydraulic cylinders for auger lift, auger turn, front and rear reels, and reel up and down, respectively.

Reference numerals 25 and 25 'denote upper and lower stoppers attached to the connecting rod 22, and the upper cutting blade 25 and the pin 21 are brought into contact with each other so that the rear cutting blade frame 13 can be suspended through the connecting rod 22. I support you.

Therefore, the pin between the upper and lower stoppers 25, 25 'is
21 can slide up and down.

Further, the horizontal frame 23 is located above the rear cutting blade 14, and a cutting blade driving device for driving the rear cutting blade 14 is provided.
In order to avoid interference with 26, it is connected to the rear cutting blade frame 13 via the mounting legs provided at the left and right ends of the horizontal frame 23, and the central portion of the horizontal frame 23 is further curved downward. It avoids interference with the hydraulic cylinder 11.

The embodiment of the present invention is configured as described above, and at the time of harvesting and storing work of grain, the combine A is put in the field, the hydraulic cylinder 11 is operated from the operating unit 4, and the harvesting unit 10 is appropriately operated. Set to the height of the machine, and while activating the reel unit 9, the mowing unit 10, the feed chamber 6, the threshing unit 2, the sorting unit 3 and other parts of the machine body, the combine unit A in the traveling unit 1 is used.
By moving forward, the tip of the culm cultivated in the field is scraped into the mowing part 10 by the reel part 9, the cusp of the grain stalk is cut by the main cutting blade 7, and the scraping auger 8 and the feed chamber 6 are used. The same tip is conveyed to the threshing unit 2, the grain is separated in the threshing unit 2, the grain is separated into a fine grain and a residue in the sorting unit 3, the fine grain is stored in the Glen tank 5, and the residue is threshed. Discharge to the outside of the machine with the tips of the.

In the combine A, the operations from cutting to threshing and selection are thus carried out in a consistent manner.
Since the cutting height of the main cutting blade 7 is set so as to cut immediately below the tip of the grain culm in order to effectively perform threshing and sorting work, the cutting height is high, and therefore the cutting height is set in the field after cutting. Is
The stump with a long plant length remains, and if it remains as it is, it will cause troubles such as wrapping of the stump culm when cultivating after the cultivation.

The rear cutting blade 14 solves the above problem by cutting the above-mentioned stump in the vicinity of a field scene, and operates as follows.

That is, after the height of the mowing unit 10 is set, the double-action hydraulic cylinder 17 is operated from the operating unit 4 to set the mowing height of the rear cutting blade 14 to start the mowing work. The blade 14 cuts the stump having a long grass height after the main cutting blade 7 has mowed, near the surface of the ground to shorten the grass height of the stump.

Then, the projection of the field scene or the combine A
When the rear cutting blade 14 is about to plunge into the soil due to the forward tilting of the vehicle, etc., the double-action hydraulic cylinder 17 is operated from the operating section 4 via the electromagnetic hydraulic valve 30 to move the rear cutting blade 14 upward and In order to prevent the plunge, the double-acting hydraulic cylinder 17 has the piston rod end 17a connected to the rear cutting blade lifting lever 19 and the cylinder head end 17b connected to the feed chamber 6 in FIG. As shown, the pressure receiving area on the piston rod side is smaller than the pressure receiving area on the cylinder head side of the piston 17c by the cross-sectional area of the piston rod 17d.Therefore, a certain amount of hydraulic oil was sent into the cylinder 17 side. At this time, the contraction speed of the cylinder 17 becomes faster than the expansion speed,
Therefore, the upper moving speed of the rear cutting blade 14 is higher than the lower moving speed, and the rear cutting blade (14) can be moved up quickly to prevent the plunging into the soil.

Further, a ground clearance detection sensor such as an ultrasonic sensor is provided on the lower surface of the reaping section 10, and the sensor detects a convex portion in the field to automatically cause the double-acting hydraulic cylinder 17 to contract and operate in the soil. It is also possible to prevent plunge.

Further, the feed chamber 6 is offset leftward from the center line of the machine body as described above, and a double-acting hydraulic cylinder is provided on the right outer surface of the feed chamber 6 offset leftward.
Since the cylinder 17 and the interlocking mechanism 16 are provided with the rear cutting blade 14 and the same frame 16 as shown in FIG.
By being located in the approximate center of 13, the left-right balance is improved, and the rear cutting blade 14 is prevented from being twisted when it moves up and down, thus ensuring smooth operation.

When the combine A is moved to move after finishing the mowing work, the hydraulic cylinder 11 is extended to move the mowing section 10 to the high position, and the mowing section 10 is moved to a high position. When raised to the position, the upper stopper 25 of the connecting rod 22 contacts the upper surface of the pin 21 and pulls the rear cutting blade 14 upward through the connecting rod 22 without operating the double-acting hydraulic cylinder 17.

FIG. 6 shows the left and right crawlers 2 of the traveling unit 1.
7, 27 ', the rear cutting blade 14 and the main cutting blade 7 are shown in a positional relationship on the plan view. The left end of the rear cutting blade 14 is leftward by a dimension B from the left end of the left crawler 27. In addition, the left end of the main cutting blade 7 is projected to the left by a dimension C more than the left end of the rear cutting blade 14.

The lateral widths D1 and D2 of the main cutting blade 7 and the rear cutting blade 14 are substantially equal to each other, and both are larger than the total width D3 of the left and right crawlers 27, 27 '.

In this way, the rear cutting blade 14 and the main cutting blade 7 are sequentially offset to the left with respect to the left and right crawlers 27, 27 ', so that the grain culm vegetated in the field is approximately centered from the outer circumference of the field. When performing a cutting operation in a counterclockwise manner in a spiral shape, it is possible to prevent the rear cutting blade 14 from cutting down a grain culm whose main cutting blade 7 has not cut the tips, and the rear cutting blade 14 cuts the cutting. It is prevented that the left and right crawlers 27, 27 'step on the stumps that have not been tilted and interfere with the next cutting of the rear cutting blade 14.

When performing the cutting operation in the clockwise direction, the rear cutting blade 14 and the main cutting blade 7 may be sequentially offset to the right, contrary to the above.

[0032]

According to the present invention, one end of the actuator extended downward to the rear and the lower end of the rear cutting blade lifting operation lever extended downward to the front are connected to each other. In conjunction with the expansion and contraction operation, the rear cutting blade lifting operation lever is smoothly and surely rotated up and down, and the rear cutting blade frame connected to the rear cutting blade lifting operation lever via the connecting rod is smoothly and reliably moved up and down. Therefore, the rear cutting blade attached to the front end of the rear cutting blade frame can be stably supported and can be moved smoothly and reliably up and down to improve the positioning of the rear cutting blade. Can be secured. In addition, since the rear cutting blade is pivotally supported at the upper end of the body frame so as to be vertically rotatable and is provided at the lower end of the rear cutting blade frame extending toward the lower front side, the rear cutting blade is placed close to the field. Since the vertical position will be adjusted in front of the lowered position, it is possible to reliably prevent the problem of colliding with the traveling portion arranged immediately behind, and to arrange the rear cutting blade and the traveling portion in close proximity. As a result, the entire body can be made compact.

[Brief description of drawings]

FIG. 1 is an overall side view of a combine having a rear cutting blade lifting device according to the present invention.

FIG. 2 is a side view of a lifting mechanism.

FIG. 3 is a front view of the same.

FIG. 4 is a vertical sectional view of a double-acting hydraulic cylinder.

FIG. 5 is a hydraulic circuit diagram.

FIG. 6 is an explanatory plan view showing arrangement positions of a crawler, a main cutting blade and a rear cutting blade.

[Explanation of symbols]

 A combine 6 feed chamber 7 main cutting blade 10 cutting section 14 rear cutting blade 17 double-acting hydraulic cylinder 17a piston rod side end 17b cylinder head side end 19 rear cutting blade lifting lever

Claims (1)

(57) [Scope of utility model registration request] 1. A cutting section (10) equipped with a main cutting blade (7) ,
In addition to the threshing part (2) provided on the machine frame (a) , the feed chamber (6) is placed in front of the threshing part (2) so that it can move up and down. ) in combined mounted vertically movably, and mounting the upper end of the telescopic operable actuator feed chamber (6), causes distraction rearwardly and downwardly the lower end of the actuator, cutting back to the feed chamber (6) The blade for raising and lowering the blade (19) is pivotally attached at the middle part, and the lever for raising and lowering the cutting blade
(19) lower by distraction toward forward and downward of the lower ends and the actuator of the rear cutting blade lifting actuating lever (19)
The rear cutting blade flap that extends toward the front and lower side of the machine frame (a).
The upper end of the ram (13) is pivotally supported up and down, and the rear cutting blade flap
Install the rear cutting blade (14) at the lower end of the rame (13),
Under the lever (19) for moving up and down the rear cutting blade
A lifting and lowering device for a rear cutting blade in a combine, characterized in that a connecting rod (22) is provided between the end and the end .