JP2535165B2 - Harvester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a harvester with improved operability.

[Prior art]

Various efforts have been made to improve the operability of the harvester.
As one of them, there is an operation of finishing cutting at the end of the field and subsequent cutting start. When the cutting clutch is disengaged when the power is turned on and off at the end of mowing, the mowing part is automatically raised, and when the mowing clutch is turned on at the beginning of the next stroke after finishing the circulation, the mowing part is opened. It is known that it is automatically lowered.

With such a configuration, it is possible to prevent the cutting blade from being damaged during traveling, and to prevent the cutting portion from being stuck in the soil or on the ridge to prevent traveling.

[Problems to be solved by the invention]

However, it cannot be said that the reaping clutch lever is necessarily provided in a place where it can be easily operated, and its operating force is heavy, and further improvement in operability is desired in a turning operation in which various operations are involved.

The present invention has been made in view of the above circumstances, and has a operability as a configuration in which raising and lowering of the reaping unit, which is easier to operate, is performed, and the drive of the reaping unit is automatically cut off in association with the operation. An object of the present invention is to provide a harvester that can raise the height and smoothly restart the mowing when the mowing unit is lowered.

[Means for solving problems]

The harvester according to the present invention detects the ground height of the mowing unit with the height sensor, and is provided with an automatic cutting height adjusting device that sets the cutting height to a predetermined range according to the detection result, and by manual operation of the switch. In a harvester capable of raising and lowering a reaper, a means for cutting off the drive of the reaper when the height of the reaper is higher than the first reference value when the reaper is raised; And a means for starting the driving of the cutting unit when the value becomes lower than the value, the first reference value is higher than the second reference value, and the second reference value is the upper limit of the range in the automatic cutting height adjusting device. It is characterized in that it is set higher than the value.

[Action]

When the reaper raising switch is operated, the reaper rises.
During this time, the height sensor detects the height of the mowing unit, but when the detected height becomes higher than a predetermined value, the driving of the mowing unit is cut off.
Next, when you operate the mowing section lowering switch, the mowing section descends,
When the height of the cutting unit detected by the height sensor becomes lower than a predetermined value, the driving of the cutting unit is restarted. When it is lowered further than this, it enters the setting range of automatic cutting height adjustment.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment thereof.

FIG. 1 is an external view of a harvester according to the present invention, in which a reaper 1 is configured to be able to move up and down with respect to a machine body 2.
The control panel on the front of the driver's seat 3 has an up / down switch 4
u, 4d (see FIG. 2) and a reaping clutch lever 5 on the side. By these operations, the reaping clutch 50 (see FIG. 2) is turned on / off. The control panel has an automatic switch 6 and a changeover switch 7 as shown in FIG.
Is provided. A grain culm sensor 13 is provided at an upper portion of the vertical transport chain 14 corresponding to the most downstream side in the grain culm flow of the drive unit of the cutting unit 1.

A height sensor 8 for detecting the ground height of the mowing unit 1 is provided below the tip of the mowing unit 1. This height sensor 8
This harvester also serves as a sensor for the automatic cutting height controller.
The height sensor 8 operates at a sled arm 8a which is in contact with the ground surface and rotates around a horizontal axis, and at a predetermined position (the second reference value) at which the sled arm 8a is rotated upward (that is, a pair value). A lower limit switch that operates at a lower height position and an upper limit switch that operates at a predetermined position (the first reference value) that rotates downward (that is, operates at a higher ground height position) (Not shown).

The automatic cutting height adjuster raises and lowers the ground height of the cutting unit to a predetermined range, and switches are also provided in this range, that is, at positions corresponding to the upper and lower limits of the dead zone of control. When the height positions of the upper limit value and the lower limit value of the dead zone are the third reference value and the fourth reference value, the harvester of the present invention has the first reference value> the second reference value> the third reference value. It goes without saying that the third reference value> the fourth reference value.

FIG. 2 is a block diagram showing the configuration of the control circuit of the harvester of the present invention. Control unit 9 including a microprocessor
The raising switches 4u, 4d, the upper and lower limit switches of the height sensor 8, the automatic switch 6, the reaping switch 5a, the changeover switch 7, and the grain culm sensor 13 are connected to enable detection of their on / off states. is there.

The reaping unit 1 is connected to a piston rod of a hydraulic cylinder 10 attached to the machine body 2, and is designed to be raised by supplying pressure oil to the hydraulic cylinder 10 and releasing the hydraulic pressure, and to be lowered by its own weight. That is, the hydraulic circuit is configured so that the hydraulic pressure of the hydraulic pump 12 is applied to the hydraulic cylinder 10 via the 3-port 3-position switching type solenoid valve 11, and the solenoids 11u and 11d of the solenoid valve 11 are demagnetized. In this state, the oil passage of the hydraulic cylinder 10 is sealed and the height of the mowing part 1 is fixed, and this is switched by exciting the solenoid 11u (or 11d) to supply pressure oil to the oil chamber of the hydraulic cylinder 10 (or oil The reaper 1 is raised (or lowered) by pulling it out of the chamber. The controller 9 supplies an exciting current to the solenoids 11u and 11d as described later.

The control unit 9 also gives a rotation control signal of the motor 51 to the drive circuit 52 of the motor 51 for turning on and off the reaping clutch 50.
That is, these signals are a forward rotation instruction signal and a reverse rotation instruction signal. When these are output, the drive circuit 52 operates the motor 51 in the forward and reverse directions, respectively, and when they are not output, the motor 51 stops rotating. The motor 51 is interlocked with the shift fork 50a of the reaping clutch 50, and forwardly rotates the driven side clutch member 50b against the clutch spring 50c in the arrow direction to prevent transmission with the driving side clutch member 50d. Then, the input gear 1a that transmits the driving force to the cutting unit 1 is stopped. Further, the reverse rotation of the motor 51 causes the shift fork 50a to move in the direction opposite to the arrow, and the clutch spring 50c causes the clutch members 50b and 50d to mesh with each other, thereby rotating the input gear 1a.

Next, the control content of the control unit 9 will be described with reference to the flowchart of FIG.

When the automatic switch 6 is turned on (1) and the raising switch 4u is turned on (2), an exciting current is applied to the solenoid 11u (3) to raise the cutting unit 1. When the raising switch 4u is turned off, its excitation is stopped and the height of the reaper 1 is fixed. When the down switch 4d is turned on (4), an exciting current is applied to the solenoid 11d (5),
The cutting unit 1 is lowered.

In addition to the lifting and lowering by manual operation of the reaping section 1, the cutting height is automatically adjusted. This is because when the controller 9 detects the switch operation when the height sensor 8 detects that the height is higher than the third reference value, the solenoid 11d is excited, and conversely, the switch operation when it is detected that the height is lower than the fourth reference value. Is detected by the control unit 9, the solenoid 11u is excited.

When a signal indicating that the upper limit switch has been operated is input from the height sensor 8 (6) and the changeover switch 7 is turned on (7), the forward rotation command signal of the motor 51 is output for a predetermined time, which causes the cutting operation. Disengage the clutch 50.

When the changeover switch 7 is off, wait until the grain culm sensor 13 detects that the grain culm is gone (off) (8) (that is, the cut grain culm is transferred from the vertical transport chain 14 to the threshing section). Output the motor forward command signal after waiting for the transfer.

On the other hand, when the lower limit switch is operated and a signal is input (9), a motor reverse rotation command signal is issued.

When the raising switch 4u is turned on at the end of mowing, the cutting unit 1 rises and the upper limit switch of the height sensor 8 operates at the same time as the upper limit switch of the height sensor 8 is activated, or when the grain culm sensor 13 is further turned off. The drive of the reaper 1 is cut off.

When the lowering switch 4d is turned on at the end of the traveling, the cutting unit 1 is lowered, and the driving of the cutting unit 1 is restarted immediately when the lower limit switch of the height sensor 8 is activated.

The operation of the up / down switches 4u, 4d is easier than the reaping clutch lever. That is, it is in a position where it is easy to operate and the operation force is also slight. Then, the raising and lowering of the mowing unit automatically stops the unnecessary driving of the mowing unit at the time of traveling, there is no unnecessary energy consumption, and the noise is released at this time.

Further, as described above, when the changeover switch 7 is turned on, there is an advantage that the mowing unit 1 immediately stops driving, and when it is turned off, after all the grain culm transportation in the mowing unit 1 is finished. Since the driving is stopped, there are advantages that there is no disturbance in conveyance, no spillage, and the cut straw can be discharged by the next stroke.

Further, the operating point of the lower limit switch at which the driving of the cutting unit 1 is restarted, that is, the second reference value is the upper limit value of the dead zone for adjusting the cutting height,
That is, since it is higher than the third reference value, the driving of the mowing unit 1 is restarted before the proper mowing height is obtained by the automatic mowing height adjustment, and good mowing can be started immediately.

The height sensor 8 is not limited to the one using a switch, but may be one that obtains the absolute value of the height with a potentiometer or the like.

FIG. 4 shows another control content of the control unit 9. If the back switch (not shown) that is turned on when the shift lever 15 is operated to the reverse gear is turned on, and the solenoid 11u is not excited by the control shown in FIG. Outputs the forward rotation command signal. As a result, the driving of the reaper 1 is stopped. However, when the raising switch 4u is turned on and the solenoid 11u is excited in order to raise the reaping unit earlier (10), it does not issue the motor forward command signal until it is demagnetized. As described above, when the lowering switch 4d is turned on and the mowing unit 1 is lowered, and the lower limit switch is turned on, a motor reverse rotation command signal is issued and the driving of the mowing unit 1 is restarted.

〔effect〕

In the case of the present invention as described above, the operability at the time of traveling is further excellent as compared with the conventional one, and a harvester having a reasonable operation at the beginning of cutting after traveling can be realized.

[Brief description of drawings]

FIG. 1 is an external view of a harvester according to the present invention, FIG. 2 is a block diagram of an essential part of the present invention, and FIGS. 3 and 4 are flowcharts showing the control contents thereof. 1 ... Mowing section, 4u, 4d ... Ascending switch 4d ... Descent switch, 8 ... Height sensor 50 ... Mowing clutch, 51 ... Motor

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Wataru Nakagawa Wataru Nakagawa 1-32, Chayamachi, Kita-ku, Osaka, Yanmar Agricultural Machinery Co., Ltd. (56) Reference JP 62-282512 (JP, A) -140823 (JP, U)

Claims (1)

(57) [Claims] 1. A height sensor detects the height of the mowing section above ground,
In a harvester that has an automatic cutting height adjustment device that keeps the cutting height within a predetermined range according to this detection result, and that can raise and lower the cutting unit by manual operation of a switch A means for cutting off the drive of the mowing section when the value becomes higher than a value, and a means for starting the drive of the mowing section when the detected height becomes lower than the second reference value when the mowing section descends. The first reference value is higher than the second reference value, and the second reference value is set higher than the upper limit value of the range in the automatic cutting height adjusting device.