JPS6140106Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic handling depth adjustment device for a harvesting machine, and particularly provides an automatic handling depth adjustment device that prevents unnecessary adjustment of the handling depth. It is something to do.

A conventional automatic handling depth adjustment device will be explained with reference to FIG. 1. Grain culms cut by a reaping section K are transferred to a threshing section D by a grain culm conveying device 1 such as a vertical conveying chain. However, the length of the grain culm is detected by two grain culm length detection means H and M provided near the entrance of the threshing section D, and if the grain culm is long enough to reach the grain culm length detection means H, the grain culm is transported. The device 1 is tilted toward the outside of the machine, and when the grain culm is too short to reach the grain culm length detection means M, the grain conveying device 1 is raised toward the inside of the machine to increase the feed in the threshing section D. The handling depth is automatically adjusted by changing the relative position of the grain culm conveying device 1 with respect to the threshing culm conveying device 2 such as a chain, and by changing the part where the grain culm is pinched by the threshing culm conveying device 2. I have to. Although it is possible to adjust the handling depth to some extent with such a configuration, the grain culms sent to the location where the grain culm length detection means H, M are installed are often a mixture of long and short grains, and for this reason, both grain culms are mixed in length and short. Both the detection means are often activated and deactivated repeatedly within a short period of time, and as a result, the grain culm conveying device 1 is tilted and raised unnecessarily frequently, the energy required for driving it is wasted, and the movable There was a problem of accelerated wear and tear on parts.

The present invention has been developed in view of the above circumstances, and by appropriately determining the operating positions of both grain culm length detection means, the control sensitivity is made slightly insensitive.
It is an object of the present invention to provide an automatic handling depth adjustment device for a harvesting machine that solves the above-mentioned problem by preventing the grain culm conveying device 1 from moving unnecessarily sensitively. This will be explained in detail based on the drawings.

Figure 1 is an external view of a combine harvester equipped with the automatic handling depth adjustment device according to the present invention (hereinafter referred to as the device), and Figure 2 is the hydraulic circuit of the device and the grain culm conveyor whose inclination angle is controlled by this. It is a drawing schematically showing the relationship between a device 1, a threshing culm conveying device 2, and the like. First grain culm length detection means (hereinafter referred to as detection switch H)
), the second grain culm length detection means (hereinafter referred to as detection switch M), and the grain culm sensor L each include a limit switch and a touch rod that controls its on/off.
At the entrance of the handling chamber of the threshing section D, which consists of HS, MS, and LS and has the handling cylinder 3, with the touch rod HS, etc. facing downward, insert the appropriate lengths in the order of L, M, and H from the grain culm conveying device 1 side. They are installed at a distance. The detection switches H and M detect the length of the grain culm S, and the grain culm sensor L detects whether the handling depth can be adjusted, that is, whether the grain culm S is being pinched by the grain culm conveying device 1. This grain culm sensor L is sometimes installed in the middle of the grain culm conveying device 1.

FIG. 3 is a side view of the detection switches H, M and the grain culm sensor L seen from the left side of the machine, that is, from the grain culm transport device 1 side. , that is, assuming that the grain culm transport direction positions are the same, in other words, the grain culm transport device 1
It is arranged along the length direction of the grain culm S which is being pinched and conveyed. When the touch rods HS, MS, LS of the switches H, M and the sensor L are not in contact with the grain culm, they are in the vertical position shown by the solid line, and the touch rod MS of the switch M is in the vertical position from the reaping part K to the threshing part D. When it comes into contact with the grain culm S being conveyed in the direction of the white arrow and rotates by an angle θ ₁ toward the rear of the machine, that is, toward the threshing section D, it is activated, and the switch H and sensor L are activated. When each of the touch rods HS and LS is rotated toward the rear of the aircraft by an angle θ ₂ (θ ₂ >θ ₁ ) beyond the position indicated by the two-dot chain line, it is activated. That is, the operating position of the detection switch M is located closer to the reaping section K than the operating positions of the detection switch H and the grain culm sensor L, that is, on the upstream side in the grain culm conveyance direction. In addition, when the grain culm sensor L is provided in the middle of the grain culm conveying device 1, it is only necessary to satisfy the above-mentioned relationship between the operating positions of the detection switches H and M.

The grain culm conveying device 1 is connected to a piston rod 4a of a hydraulic cylinder 4 so that its inclination angle can be changed by the operation of a hydraulic cylinder 4 constituting a hydraulic circuit. 5 is a 4-port, 3-position switching type electromagnetic directional control valve, and when the solenoid 5r is energized, it is set to the switching position r, and the piston rod 4a moves back as shown by the arrow to deeply handle the grain culm conveying device 1. When the solenoid 5l is energized, the solenoid 5l is turned to the switching position 1, and the piston rod 4a moves forward to tilt the grain culm conveying device 1 toward the shallow handling side. 6 is a hydraulic pump, which constitutes a hydraulic circuit.

FIG. 4 is an electric circuit diagram of the device according to the present invention, where 7 is a battery and 8 is a combine key switch that turns on and off the electricity to this electric circuit. The parts constituting this electric circuit are activated when the grain culm sensor L, the detection switches M and H, and the piston rod 4a of the hydraulic cylinder 4 reach the most retracted position and the grain culm conveying device 1 is in the most upright state. A limit switch P disposed at an appropriate position so as to be activated, a limit switch Q disposed at an appropriate position so as to be activated when the piston rod 4a reaches the most advanced position and the grain culm conveying device 1 is in the most tilted state; Solenoids 5l, 5r, protective diodes 9l, 9r, and a manual push button type switch 10 for instructing shallow handling, which is provided in the operation section in front of the driver's seat U.
1, a manual push-button type switch 10r for instructing deep handling, a single-pole, single-throw type automatic manual switching switch 11, and a pilot lamp 12 that lights up to notify you of automatic adjustment. Between the electrodes of the battery 7, which is controlled on/off by the key switch 8, there is a normally closed contact 10rb of a switch 10r, a normally closed contact 10lb of a switch 10l, a normally open contact of the switch 11, the grain culm sensor L, and the detection switches M and H, respectively. La, Ma and Ha, the normally closed contact Qb of the limit switch Q, and the solenoid 5l are connected in series in this order. and Ma, Ha, Qb and 5l
The normally closed contact of detection switch M is in the series circuit part of
Mb, the series circuit of normally closed contact Pb of limit switch P and solenoid 5r are connected in parallel, and the normally open contact 10ra of switch 10r is connected to 10rb,
In parallel to the series circuit parts of 10lb, 11, La and Mb, the normally open contact 10la of switch 10l is connected to 1
It is connected in parallel to the series circuit parts of 0rb, 10lb, 11, La, Ma and Ha.

In the present device configured as above, the key switch 8 and the switch 11 are closed, and the reaping part K
When the grain culm S reaches the entrance of the handling chamber of the threshing section D after being harvested by the
When it is long enough to reach HS (or short enough not to reach MS of the detection switch M), the normally open contact La
is closed, and the normally open contacts Ma and Ha (or normally closed contacts Mb) are closed, so the solenoid 5l (or 5r) is energized, and the grain culm conveying device 1 moves toward the outside of the machine ( The grain culm The state corresponding to the length of the grain is transferred to the threshing culm conveying device, which automatically adjusts the handling depth.

On the other hand, when the switch 11 is opened, the solenoid 5l (or 5r) is energized by pressing the switch 10l (or 10r), the grain culm conveying device moves in a predetermined direction, and the handling depth is manually adjusted. Adjustment is performed, but even when switch 11 is closed and switch 10l (or 10r) is pressed, the normally closed contact 10lb (or 10r) is pressed.
rb) is opened, switch 10l (or 1
0r), the manual adjustment of the handling depth takes precedence over the automatic adjustment described above.

Now, the automatic adjustment of the handling depth is performed as described above, but in the proposed device, the operating position of the detection switch H and the operating position of the detection switch M are different, and the following unique features are realized. It has an effect. In other words, when the tip of the grain culm S is located between the touch rods of the detection switches M and H and the handling depth is appropriate, a grain culm that is longer than other grain culms is transported by a certain amount. In this case, these long grain culms come into contact with the touch rod HS, but in order to activate the detection switch H and close the contact Ha, the touch rod HS must be rotated by a relatively large angle θ ₂ . Therefore, in order for the contact point Ha to close, the amount of long grain culms must be a certain amount or more. Therefore, even if less than this amount of long grain culms are transported, the circuit condition will not change and the handling depth will not be changed or adjusted. That is, even if a small number of long grain culms are mixed in and conveyed, the handling depth is not adjusted once to the shallow handling side and once to return to the original state as in the conventional device. On the other hand, when some grain culms that are shorter than other grain culms are transported, these shorter grain culms do not touch the contact rod MS, but the detection switch M is activated and the contact point Mb is To open the circuit, the touch rod MS only needs to be rotated by a relatively small angle _θ1 , and even if a small amount of short grain culms mixed in does not touch the touch rod MS, the remaining grain culms will trigger the detection switch M. In order to operate it, the touch rod MS has to be rotated by θ ₁ or more, and as a result, the circuit state remains unchanged and the handling depth is not adjusted. That is, even if a small amount of short grain culms are mixed and conveyed, unlike the conventional apparatus, the handling depth is not changed once to the deep handling side and once to return to the original state. Note that in any of the above cases, the contact rod LS of the grain culm sensor L is rotated by θ2 _or more due to a sufficiently large amount of grain culms, and the contact point La is closed.

As described above, according to the present device, the control sensitivity for adjusting the handling depth is reduced, but when a certain amount of long grain culms or short grain culms are transported, the required handling depth adjustment is performed. Of course, you will be exposed to it. Even if some grain culms are treated deeply or shallowly as a result of dulling the control sensitivity as in the present device, the handling cylinder 3
There is virtually no increase in the burden or deterioration of threshing conditions.

Further, the grain culm conveying directions of the touch rods of the first and second grain culm length detection means are substantially the same, and the second
Since the operating position of the first grain culm length detecting means is located upstream in the grain culm conveying direction than the operating position of the first grain culm length detecting means, both detecting means detect the same grain culm or a plurality of closely adjacent grain culms. The length of these grain culms can be detected at the same time, and the appropriate handling depth can be obtained for these grain culms. Comparing this with a configuration in which the positions of the contact rods of both detection means in the grain culm transport direction are different back and forth, in the latter case, for different grain culms or for grain culms at positions separated by different distances of their phases, pair 2
As the contact rods of the two detection means come into contact with each other, the grain culm length may not be correctly detected for any grain culm that touches or can come into contact with any of the contact rods, and there is a possibility that appropriate handling depth adjustment may not be performed. On the other hand, it can be seen that the present invention does not have such a risk and the effect of the present invention is excellent.

As detailed above, in the case of the present invention, the handling depth is not adjusted in accordance with slight fluctuations in the grain culm length, and the frequency of movement of the grain culm conveying device 1 is reduced, resulting in energy savings and movability. In addition to being effective in extending the lifespan of the parts, the stability of the grain culm inheritance from the grain culm conveying device 1 to the threshing culm conveying device increases, and there is a practical benefit of increasing the stability of control as a whole.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Figure 1 is an external view of a harvester equipped with the proposed device;
The figure is a hydraulic circuit diagram of the main parts, Figure 3 is a side view for explaining the operating positions of detection switches H and M, and Figure 4 is a side view for explaining the operating positions of detection switches H and M.
The figure is an electrical circuit diagram of the proposed device. 1... Grain culm conveyance device, 2... Threshing culm transfer device, 3... Handling cylinder, D... Threshing section, K... Reaping section,
H, M...Detection switch, L...Grain culm sensor.

Claims (1)

[Scope of utility model registration request] The length of the grain culm being transported by the grain culm conveying device that transports the grain culm cut by the reaping section to the threshing section is detected, and based on the detection result, the threshing culm is transported in the threshing section. In an automatic handling depth adjustment device for a harvesting machine that automatically adjusts the handling depth by changing the relative position of the grain culm conveying device with respect to the device, when the grain culm comes into contact with the handle of the device, a first grain culm length detection means that is activated to issue a control signal to change the relative position to the shallow handling side; and a second grain culm length detection means that issues a control signal to change the grain culm length to the deep handling side, and the first and second grain culm length detection means each detect the grain culm length in a non-contact state. The positions of the rods in the grain culm conveyance direction are substantially the same, and the position in the grain culm conveyance direction at which the second grain culm length detection means operates is set to be lower than the position in the grain culm conveyance direction at which the first grain culm length detection means operates. An automatic handling depth adjustment device for a harvesting machine, characterized in that it is located on the upstream side in the grain culm conveyance direction.