JPS5971616A - Apparatus for adjusting reaming height of combine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an improvement in a cutting height adjusting device for a combine harvester.

The mowing height adjustment device of the combine switches the oil path by operating an electromagnetic directional control valve equipped with a solenoid that is energized by a manual switch and an automatic switch that opens and closes depending on the distance between the cutting part and the ground surface. It is configured to adjust the cutting height relative to the culm in the field by operating the cutting unit to raise and lower the cutting part. By the way, with conventional cutting height adjustment devices, the raising and lowering speed of the cutting section is the same whether it is manually adjusted by operating a manual switch or automatically adjusted by operating an automatic switch. The speed is adjusted to be suitable for manual adjustment that requires relatively quick elevation, such as emergency adjustment at the time of cutting, raising the cutting part at the same time, and raising the cutting part at the start of cutting.

For this reason, this speed is suitable for automatic adjustment! l'l (< , Overcorrection may cause hunting to improve control stability, or 7I may cause irregularities in stubble height.
If the arm of the sensor that measures the separation dimension enters the small section, the reaping section will quickly follow this and lower its tip Eg (l) into the soil ahead of I.
There were negative effects such as 'm @.

The present invention has been made in view of the above circumstances, and in the case of manual adjustment, the reaping section is raised and lowered relatively quickly as in the past, and in the case of automatic adjustment, the reaping section is raised and lowered at a slower speed. The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. Describe.

FIG. 1 shows a combine harvester equipped with a cutting height adjustment device according to the present invention, and shows the distance between the grass dividing plate 2 and the ground surface at the stem of the grass dividing plate 2 constituting the reaping section 1. A sensor arm 3 is pivotally attached to the sensor arm 3, which rotates to move downward and upward depending on the size of the sensor. The reaping section I is moved up and down by the vertical movement of the screw 1-frost 4a of the hydraulic cylinder 4 attached to the front part of the main frame, and the reaping section I is raised and lowered. As shown in FIG. 2, the hydraulic circuit consisting of the hydraulic cylinder 4.3, a 1-3 position switching type electromagnetic directional control valve 5, a hydraulic pump 6, etc. is activated by energizing the solenoid 5u of the electromagnetic directional control valve 5. The electromagnetic directional control valve 5 becomes the switching position U, and the hydraulic pressure in the hydraulic cylinder 4 rises to raise the reaping part 1. By energizing the solenoid 5d, the electromagnetic directional control valve 5 becomes the switching position d, and the hydraulic cylinder 4 moves to the switching position d. When the hydraulic pressure in the hydraulic cylinder 4 decreases and the reaping unit 1 is lowered by its own weight, and when the power to both solenoids 5u and 5d is cut off, the electromagnetic directional control valve 5 is in the neutral position 1], and the hydraulic cylinder 4 is maintained at the oil pressure at the time when the electromagnetic directional control valve 5 returns to the neutral position n, and the reaping section 1 stops rising or falling at that time.

The electrical circuit in Figure 2 is for the solenoids F5u and 5d.
The figure shows an on/off control circuit for energization, and includes a battery 11,
Combine key switch 12. -f dynamic automatic changeover switch 13. Both are single pole double throw type manual switch 14 and automatic switch 15. It also includes a switching member 16 that is adjusted to repeat opening and closing at relatively short predetermined time intervals, such as a combination of a flicker relay, a timer relay, or a pulse generation circuit and a switching circuit that is controlled on and off by the pulse generation circuit. The reaping up/down lever 7 is arranged at the rear left of the driver's cab 8. The T-shaped switching operation groove 70 shown in FIG. 2 together with the head of the reaping up/down lever 7 is aligned with the reaping section 1 in FIG. This is visually shown, and switching between manual and automatic mode can be done by operating the reaping up/down lever 7 in the left and right direction (up and down direction in Figure 2), and by operating it in the front and rear direction of the machine (left and right direction in Figure 2). Manual lowering and raising can be switched respectively by operating the switch. Immediately move the reaping up/down lever 7 to the groove 70a on the right side of the machine (lower side in the figure).
The manual/automatic changeover switch 13 is turned on by locking the switch, and the left side (upper side of the figure) and the front (right side of the figure)
Manual switch 14 by engaging with groove 70cl of
is inserted into the switching terminal 14d, and by engaging with the groove 70u on the rear left side of the body, the manual switch [4] is inserted into the switching terminal 14u. on the other hand,
The automatic switch 15 is interlocked with the sensor arm 3, and when the sensor arm 3 is lowered by a predetermined amount or more,
The automatic switch 15 is turned on to the switching terminal 15d, and when the sensor arm 3 rises beyond a predetermined amount, the automatic switch 15 is turned on to the switching terminal 15u.

And these connections are as follows. A common terminal 14c of the manual switch 14 is connected to the battery 11 via the key switch 12, and switching side terminals 14u and 14d of the manual switch 14 are connected to one ends of solenoids 5u and 5d, respectively. Further, one end of the intermittent switching unit +Jf16 is connected to the battery 11 via the manual automatic changeover switch 13 and the key switch 12, and the other end of the intermittent switching member 16 is connected to the common terminal 15c of the automatic switch 15. switching side terminal 15u of automatic switch 15,
15d are connected to one end of the solenoids 5u and 5d, respectively, and the other ends of the solenoids 5u and 5d are grounded to the body.

The device of the present invention configured as described above has a key switch 12.
is closed, and the reaping up/down lever 7 is engaged with the front groove 70d or the rear groove 70u on the left side of the switching operation groove 70, thereby connecting the common terminal 14c of the manual switch I4 and the switching side terminal 14d or 14(1). connected, solenoid l"5d
Or 5u is energized. As a result, the electromagnetic directional control valve 5 is placed in the switching position d or U, so that the oil pressure in the hydraulic cylinder 4 is lowered or raised, and the reaping section I is lowered or raised. In other words, the cutting height is manually adjusted by such an operation, and if the solenoid 5d or 5u is energized, the cutting height lever 7
The groove 70d on the left front of the switching operation groove 70, or
As long as it is engaged with the rear groove 70u, it is continuously carried out, so that the mowing section can be raised and lowered quickly, and emergency adjustment of the cutting height, which is the purpose of manual adjustment, is possible.

Next, the groove 70a on the right side of the operating groove 70 switches the reaping upper and lower lever T.
By locking the switch I3, the manual automatic changeover switch I3 is closed. The sensor arm 3 descends or rises depending on the size of the distance between the grass dividing board 2 and the ground surface, so when the amount of descent or rise exceeds a predetermined amount, the automatic switch 15 is switched to the m terminal 15c. side terminal] 5d or 15u is connected. This starts energizing the solenoid 5d or 5u, but since the intermittent switching unit 16 operates by closing the manual automatic changeover switch 13 and the automatic switch 15, the energization to the solenoid 5d or 5u is stopped by Iv.
The switching is performed intermittently at predetermined time intervals determined by the constant or variable operating characteristics of the i-continuous switching member 16. Therefore, the electromagnetic directional control valve 5 is repeatedly switched between the switching position d or the neutral position n in response to the interruption of the energization, and the hydraulic cylinder 4
The lowering or raising of the oil pressure within the reaping section 1 is performed gradually, and as a result, the lowering or raising of the reaping section 1 is also performed gradually. In other words, the mowing height is automatically adjusted as described above by operating the reaping upper and lower levers 7 and operating the sensor arm 3. This prevents excessive cutting height correction and hunting. In addition, there is no irregularity in the height of the stubble, and the tip of the cutting section does not plunge into the soil, resulting in excellent control stability and protection of the machine.

Note that during automatic adjustment, the oil passage is switched intermittently by the electromagnetic directional control valve 5 as described above, but the rising and falling characteristics of the oil pressure flowing into the hydraulic circuit are slow when rising and falling. , the reaping part I moves up and down smoothly and does not rise and fall unnaturally in stages.

Q' It is possible to provide an excellent cutting height adjustment device that can perform emergency height adjustment without any trouble, while ensuring control stability and protection of a machine body during automatic adjustment.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which FIG. 1 is a perspective view of a combine harvester equipped with the device of the present invention, and FIG. 2 is an electric diagram showing a hydraulic circuit diagram of the device of the present invention. It is a circuit diagram.

Claims (1)

[Claims] 1. The oil path is switched by the operation of an electromagnetic directional control valve equipped with a solenoid whose energization is assisted by a manual switch and an automatic switch that opens and closes depending on the distance between the reaping part and the ground surface, and the hydraulic cylinder is operated. In a combine harvester cutting height adjustment device that raises and lowers the cutting part by
The configuration is such that the solenoid is continuously energized by the manual switch operation, while the automatic switch is configured to intermittently energize the solenoid at predetermined time intervals during the control circuit for energizing the solenoid 1'. A mowing height adjusting device characterized by being provided with an intermittent switching member that allows the mowing height to be adjusted.