JPH0731251A - Combine harvester - Google Patents

Abstract

PURPOSE:To obtain a combine harvester excellent in suppressing effects on damage by constructing an auxiliary reaper so as to enable the lifting, lowering and driving through a hydraulic cylinder and installing an accumulator for absorbing the impact force for the auxiliary reaper in a hydraulic circuit for the hydraulic cylinder. CONSTITUTION:This combine harvester is obtained by installing an auxiliary reaper 8 capable of freely changing the position at the rear and in the lower part of a pretreatment device 3 in the lower part of the reaping pretreatment device 3 liftably and lowerably attached to a mobile machine body and constructing the auxiliary reaper 8 so as to enable the lifting, lowering and driving through a hydraulic cylinder 11 and simultaneously installing an accumulator 13 for absorbing impact force for the auxiliary reaper 8 in a hydraulic circuit (a) for the hydraulic cylinder 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an auxiliary mowing device which can be repositioned below and below the mowing device of the mowing pretreatment device which is mounted on a traveling body so as to be vertically movable. Regarding the combine provided.

[0002]

2. Description of the Related Art In the above combine, when the height of the planted culm is long, the cutting pretreatment device is raised and the auxiliary reaper is lowered to cut the planted culm into two upper and lower stages. By transporting only the graining part to the threshing device and leaving the middle part on the ground, the occurrence of straw debris in the threshing device is reduced to improve the threshing processing efficiency, and by cutting the middle part, By cutting only the granulation part and leaving the intermediate part as it is, it is possible to improve the workability at the time of tilling thereafter, but conventionally, when driving the auxiliary cutting device up and down, JP-A-4-2489
As shown in Japanese Patent Publication No. 15, the supporting arm of the auxiliary harvesting device can be driven up and down by an electric cylinder.

[0003]

When the auxiliary mowing device collides with an obstacle such as a convex portion of the ground or a small stone during mowing work with the auxiliary mowing device being lowered, the auxiliary mowing device or There is a disadvantage that the support arm is deformed or the screw part of the electric cylinder is crushed.

An object of the present invention is to make it possible to reduce or avoid damage to the auxiliary mowing device when the auxiliary mowing device collides with an obstacle.

[0005]

In order to achieve the above-mentioned object, a characteristic structure of the present invention is such that an auxiliary cutting device can be driven up and down through a hydraulic cylinder, and the auxiliary cutting device is provided in a hydraulic circuit for the hydraulic cylinder. The point is that an accumulator for absorbing impact force on the device is provided.

[0006]

When the auxiliary cutting device collides with an obstacle such as a convex portion of the ground or small stones, the hydraulic cylinder contracts and the impact force is absorbed by the accumulator.

[0007]

As a result of the above construction, the auxiliary reaping device can be easily modified by replacing the lifting drive device for the auxiliary reaping device with a hydraulic cylinder and inserting an accumulator in its circuit. It is possible to reduce or avoid damage to the auxiliary harvesting device and the support arm when the vehicle collides with an obstacle.

[0008]

EXAMPLE As shown in FIG. 5, a mowing pretreatment device 3 can be lifted up and down around a horizontal axis P ₁ through a hydraulic cylinder (not shown) in front of a traveling machine body 2 equipped with a threshing device 1. It is installed in the whole culm input type combine.

The cutting pretreatment device 3 includes a take-up reel 4 for scraping planted grain stalks, a clipper-type slicing device 5 for cutting the planted grain stalks, and a cut grain stalk in the machine width direction. It comprises an auger 6 gathered in the center, and a conveyor 7 for conveying the grain culms gathered in the center to the threshing device 1.

At the lower part of the pre-mowing treatment device 3,
When the height of the planted grain culm is long, a clipper-type auxiliary reaper 8 capable of cutting the planted grain culm in two stages, upper and lower, is provided rearward of the reaping device 5 and below the reamer so that the position can be freely changed. Has been.

As shown in FIG. 1, the auxiliary cutting device 8 is provided.
Is attached to the tip ends of a pair of left and right support arms 9, 9 pivotally supported around the horizontal axis P _{2 at} the lower part of the pretreatment frame 3a, and an elevating arm connected to the support arms 9, 9. 10, 10 and the hydraulic cylinder 11 connected to the pretreatment frame 3a are connected to each other, and the auxiliary harvesting device 8 is moved to the lower surface of the pretreatment frame 3a as the hydraulic cylinder 11 expands and contracts. It is configured so that it can be switched to a use position separated from the lower surface of the.

As shown in FIGS. 1 and 3, the rear surface of the elevating arm 10 is guided by rollers 12 in the left-right direction, and hydraulic pressure is generated by backlash of a pivotal support at the base end of the hydraulic cylinder 11. It is configured to prevent the cylinder 11 from tilting in the left-right direction.

As shown in FIG. 2, the lifting hydraulic cylinder 11 for the auxiliary reaper 8 is composed of a single-acting hydraulic cylinder, and an accumulator 13 and a pressure sensor 14 are provided in a hydraulic circuit a for the hydraulic cylinder 11. When the auxiliary harvesting device 8 collides with an obstacle such as a convex portion of the ground or pebbles, the pressure energy at the time of the impact is absorbed by the accumulator 13, and when the pressure sensor 14 exceeds a set pressure. It is configured to activate the buzzer 15 as an alarm device.

Further, as shown in FIG. 5, the oil for the hydraulic cylinder C for vertically swinging the screw type unloader Ta for discharging the grains in the grain tank T from the oil passage a for the lifting hydraulic cylinder 11 is shown. The passage b is branched, and in order to share the operation valve V for the lifting hydraulic cylinder 11, in the oil passage a for the lifting hydraulic cylinder 11 and the oil passage b for the hydraulic cylinder C, respectively, On-off valves Va and Vb are provided which can selectively operate both cylinders 11 and C.

Further, as shown in FIG. 1, when the cutting height of the hydraulic cylinder 11 is set in the most contracted state at the connecting portion between the lifting hydraulic cylinder 11 and the lifting arm 10. In place of the accumulator 13, a shock absorbing mechanism K for absorbing the impact force is provided, and when an obstacle strikes the auxiliary reaper 8, the lifting arm 10 slides downward to cause the impact force. Is able to absorb.

That is, as shown in FIG. 4, the rod 16a connected to the hydraulic cylinder 11 is slidably mounted on the lifting arm 10, and the coil spring 16b is externally fitted to the rod 16a so that the lifting arm 10 is lifted. The elevating arm 10 can be slid downward through a long hole 10a provided in the.

Therefore, when mowing a normal length grain culm, the auxiliary mowing device 8 is placed in the retracted posture and the mowing pretreatment device 3 is used.
Is lowered, the mowing device 5 of the mowing pretreatment device 3 can perform one-step mowing of the planted grain culm at the base of the plant, and when mowing a long grain culm, the mowing pretreatment device 3 is moved up and the auxiliary cutting device 8 is lowered to the working posture, the cutting device 5 of the pretreatment device 3 cuts the tip of the planted grain culm, and the uncut stem culm is the auxiliary cutting device. 8
You can perform two-step cutting by cutting around the stock base.

[Other Embodiments] The hydraulic cinder 11 for raising and lowering the auxiliary mowing device may be a double-acting hydraulic cinder.

Alternatively, the lifting arm 10 may be omitted and the hydraulic cylinder 11 may be directly connected to the support arm 9.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view of an auxiliary mowing device.

[Fig. 2] Hydraulic circuit diagram

FIG. 3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

[Figure 5] Overall side view

[Explanation of symbols]

 2 Traveling vehicle 3 Pre-processing device for cutting 5 Cutting device 8 Auxiliary cutting device 11 Hydraulic cylinder 13 Accumulator a Hydraulic circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuichi Minami 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd.

Claims (1)

[Claims] 1. The position of the cutting pretreatment device (3) mounted on the traveling machine body (2) so as to be able to move up and down is changed behind the cutting device (5) of the pretreatment device (3) and downward. In a combine provided with a free auxiliary harvesting device (8), the auxiliary harvesting device (8) is configured to be movable up and down via a hydraulic cylinder (11), and a hydraulic circuit (a) for the hydraulic cylinder (11) is provided. A combine in which an accumulator (13) for absorbing impact force on the auxiliary harvesting device is provided.