JPS6054002B2 - combine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a combine harvester equipped with an automatic vehicle speed control mechanism that automatically and reversibly reduces the reaping travel speed based on the detection of an increase in load in order to stabilize the threshing load. Regarding.

According to this type of reaping and harvesting machine, the amount of husk reaped per unit time is controlled by automatically controlling the vehicle speed in relation to the threshing load, and as a result, the amount of husk harvested per unit time is controlled. While stabilizing the threshing load by controlling the amount of culm supplied, it is possible to fully utilize the allowable capacity and perform efficient work.

However, in order to control the vehicle speed in this way, it is generally necessary to increase the speed change acceleration during speed increase and deceleration to a fairly large degree.
Because it was set to a value, the following problem occurred.

In other words, in this case, when the load increases, it has the advantage of being able to quickly decelerate and reduce the load increase state at an early stage.
Even when the load is reduced, the speed is quickly increased, resulting in a sudden increase in the amount of husk supplied to the threshing equipment.
There is a risk that the load may be increased in an unstable state, such as a situation where the threshing load is suddenly increased,
As a result, it has become difficult to perform stable control. As a means to solve the above-mentioned inconveniences, for example, as shown in Japanese Patent Publication No. 189-1897, the vehicle speed is increased or decreased in accordance with the movement of a governor linked to the rotation of the handling barrel of the threshing machine. Moreover, when the handling cylinder rotation and vehicle speed that have once decreased are restored to the acceleration side, a mechanism is provided to restore the vehicle speed with a delay in the restoration of the handling cylinder rotation, thereby making it possible to better eliminate overload. has been known for a long time.

With the conventional structure configured as described above, the vehicle speed can be increased or decreased as the handling drum rotation changes, and the handling cylinder rotation can be restored prior to restoring the vehicle speed when the speed increases or decreases. It is useful in that overload can be resolved relatively smoothly, but since the increase/decrease in vehicle speed and the rotation of the handling cylinder are increased/decreased at a speed corresponding to the degree of change in load, for example, overload can be gradually resolved. When the vehicle speed increases, the vehicle speed is only gradually reduced, and as a result, the overload condition continues for a long time, which may have an adverse effect on various devices and the objects to be processed.
Furthermore, when the load suddenly decreases, the vehicle speed also increases relatively rapidly, which may cause the aircraft to stall or the engine to stop. The present invention aims to control the traveling speed in accordance with increases and decreases in the load acting on the engine, so that the traveling speed can be controlled without being affected by the degree of load change, that is, the acceleration of the load change. It is possible to control the vehicle speed so that the vehicle speed can be smoothly decelerated when under load, and can be increased without engine stop when the overload is removed, and the degree of speed increase can also be controlled depending on the situation of the harvested and threshed stalks and culms. The purpose is to provide a combine that can be modified as appropriate.

The characteristic structure of the present invention for achieving the above object is as follows:
In a combine harvester equipped with a vehicle speed control mechanism that automatically controls vehicle speed according to an increase or decrease in threshing load, the vehicle speed control mechanism may include a detector that detects an increase or decrease in the load, and a load detected by the detector that is set in advance. Reduce the traveling speed based on the detection result that the load has increased more than the standard load, and
A control circuit that outputs a control command using a predetermined pulse signal to increase the traveling speed based on the detection result that the detected load has decreased from the reference load, and a control circuit that increases or decreases the transmission based on the control command. and an operating device that performs a speed change operation, and the pulse signal output from the control circuit is such that the speed change acceleration during deceleration control is greater than the speed change acceleration during speed increase control. The structure is set to control the operation, and among the pulse signals, the signal output during speed increase control is configured to be changeable and adjustable.This structure provides the following effects.

1. In other words, the increase/decrease in vehicle speed when an overload occurs and when the overload is removed is not done in conjunction with the acceleration of load change, but in accordance with a preset pulse signal 1. Therefore, since the vehicle speed is increased or decreased with a predetermined acceleration, unlike the conventional structure described above, depending on the degree of load change, the overload state may continue for a long time or the vehicle speed may suddenly increase. This makes it easier to avoid inconvenient situations such as the aircraft crashing or the engine stopping.

2. Furthermore, the pulse signals used to control vehicle speed increases and decreases are set so that the gear shift acceleration during deceleration control is greater than the shift acceleration during speed increase control, which increases the load acting on the engine. As the load decreases, the vehicle speed is quickly decelerated to eliminate the overload as early as possible, and as the load decreases, the vehicle speed is increased more slowly than in the case of deceleration described above. This has the advantage that it is easy to deal with sudden increases in load inside the system.

DFurthermore, among the pulse signals, the signal output during speed increase control is configured to be freely changeable and adjustable, so that the acceleration of speed increase can be changed as appropriate.
By appropriately changing and adjusting the acceleration during speed increase according to the conditions of the crop to be threshed, there is an advantage that the risk of trouble caused by a sudden increase in load during speed increase control is reduced.

In other words, when the harvesting and threshing work in one field is completed and the crop is moved to another field, or even in the same field, the growth status of crops differs due to differences in sunlight conditions, etc., and the rate of increase in load increases accordingly. The degree of increase in load may change depending on the humidity and type of crop, but by changing the acceleration during the speed increase control in response to each of these conditions. , it is possible to avoid sudden increases in load due to crop conditions, and avoid troubles caused by this.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The figure shows a crawler traveling device 1, on which a threshing device 2, an engine 3, a control seat 4, etc. are mounted, and a hoisting device 5, a reaping device 6, a vertical transport device T7, etc. at the front of the machine. A combine harvester equipped with a pre-harvesting processing section is shown. While running, the grain to be planted is pulled up, harvested, conveyed vertically and delivered to the feed chain 8 of the rear threshing device 2, and this feed chain 8 It is configured to handle and thresh the tips of the grains with a handling cylinder 9 (shown in Figure 2) while holding and transporting the grains. The crawler traveling device 1 is driven by an output from a hydraulic continuously variable transmission device 10 that is linked to the engine 3, as shown in FIG.

Further, a transmission shaft 11 extending from the continuously variable transmission device 10 to the reaping pretreatment section is mounted on a protruding shaft, and the crawler traveling device 1
and the reaping pre-processing section are configured to be changed in speed at the same time. The continuously variable transmission 10 is configured to shift gears as the swing shift arm 13 is swing-operated via a link mechanism ±1 by a swing lever 12 pivotally mounted near the pilot seat 4. It is configured.

Furthermore, this combine harvester is equipped with an automatic vehicle speed control mechanism described below, which controls the vehicle speed according to increases and decreases in the load on the handling barrel 9, so that the load can be stabilized and work can be carried out efficiently. There is.

That is, an electric motor 16 is interlocked and connected to the swing link 14a interposed in the link mechanism 11 via a friction transmission mechanism ±1, and these link mechanisms ±1, friction transmission mechanism ±1, and electric motor 16 However, the continuously variable transmission 1
The electric motor 16 of this operating device 22 constitutes an operating device 22 that performs a speed change operation.
It is connected to a control circuit 21 that controls the operation of the . This control circuit 21 is connected to a detector 19 that electrically detects the torque of the rotation support shaft 18 that pivotally supports the handling cylinder 9, and a detector 20 that detects the swing angle of the swing link 14a. It is equipped with a comparison mechanism 17 that compares the electric signals transmitted from the torque detector 19 and the angle detector 20,
An increase or decrease in the threshing load is detected based on a change in the electric signal from the torque detector 19, and a deceleration signal is generated based on the detection result that the detected threshing load has increased more than a preset reference load, or A speed increase signal based on a detection result that the load has decreased from the reference load and the angle detector 2
Torque detector 1
The electric motor 16 is configured to issue an increase/decelerate control command signal to operate the electric motor 16 in the forward or reverse direction in response to a change in the electric signal value transmitted from the angle detector 20 until the signal value transmitted from the angle detector 20 reaches a desired set value. ing. Therefore, vehicle speed proportional control is performed in which the traveling speed is automatically and reversibly changed based on a preset inverse proportional relationship in accordance with the threshing load value in accordance with fluctuations in the threshing load. Through this control, the vehicle speed is controlled in response to fluctuations in the threshing load, and as a result, efficient reaping traveling work can be performed while keeping the threshing load constant.

The control circuit 21 also includes a first speed increasing transmitter 21a and a second speed reducing transmitter 21b, which transmit the control signal from the comparing mechanism 17 as a pulse signal to the electric motor 16, and a third transmitter 21b. As shown in the figure, the width 1 of the pulse signal emitted by the first oscillator 21a is configured to be smaller than the width L of the pulse signal emitted from the second oscillator 21b. The speed change acceleration in is configured to be smaller than the speed change acceleration during deceleration control.

Further, the first signal device 21a is configured to be variable so that the width 1 of the pulse signal can be changed, and by this change adjustment, it becomes possible to change and adjust the magnitude of the acceleration acceleration. There is. In addition, various other means can be considered for changing the acceleration acceleration using a pulse signal.
Any structure may be used.

[Brief explanation of drawings]

The drawings show an embodiment of the combine harvester according to the present invention.
FIG. 2 is a side view of the combine, FIG. 2 is a schematic diagram showing a vehicle speed control mechanism, and FIG. 3 is a plan view showing a pulse signal. 19...Detector, 21...Control circuit,
22... Operating device.

Claims (1)

[Claims] 1. In a combine harvester equipped with a vehicle speed control mechanism that automatically controls the vehicle speed according to an increase or decrease in the threshing load, the vehicle speed control mechanism is equipped with a detector 19 that detects changes in the increase or decrease in the load, and a load detected by the detector 19 in advance. A predetermined method is configured to reduce the traveling speed based on the detection result that the detected load has increased more than the set reference load, and increase the traveling speed based on the detection result that the detected load has decreased more than the reference load. The control circuit 21 includes a control circuit 21 that outputs a control command based on a pulse signal, and an operating device 22 that increases or decreases the speed of the transmission 10 based on the control command.
The pulse signal outputted from 1 is set to control the operation of the operating device 22 so that the speed change acceleration during deceleration control is greater than the speed change acceleration during speed increase control, and the pulse signal is A combine harvester characterized in that among the signals, the signal output during speed increase control is configured to be changeable and adjustable.