JPS639807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic handling depth adjustment device for a combine harvester.

The automatic handling depth adjustment device of the combine shown in FIG. An electromagnetic directional control valve equipped with a solenoid that detects the length of the grain culm using two automatic switches M and H such as a limit switch arranged in front of the grain culm, and controls the energization on and off according to the detection result. The oil path of the provided hydraulic circuit is switched by the electromagnetic directional control valve, and the inclination angle of the vertical conveyance chain 1 connected to the hydraulic cylinder in the hydraulic circuit is changed, and the conveyance chain 1 to be clamped to the feed chain 2 is By changing the part of the grain culm, the relative position of the grain culm with respect to the handling barrel is changed depending on the length of the grain culm, thereby adjusting the handling depth. By the way, if the configuration is such that the inclination angle of the vertical conveyance chain is immediately changed by the opening/closing operation of the automatic switch, the hunting phenomenon (due to the fast operation, the inclination angle is changed by more than the width of the dead zone and the processing depth is increased) (a phenomenon in which the depth changes repeatedly within a short period of time) and the handling depth cannot be adjusted stably, so conventional automatic handling depth adjustment devices are equipped with a throttle valve in the hydraulic circuit. In addition, the operating speed of the hydraulic cylinder for changing the inclination angle of the vertical conveyance chain was slowed down to some extent. On the other hand, in addition to the automatic switch for automatically adjusting the handling depth, such a device is also provided with a manual switch for similarly controlling the on/off of energization to the solenoid. Normally, this manual switch should be turned on when emergency adjustment is required, but as mentioned above, there is a throttle valve in the hydraulic circuit, so even if the manual switch is turned on, vertical transport will not be possible. Changing the inclination angle of the chain, that is, adjusting the handling depth, is carried out with a slight delay from the time of the loading operation, so with conventional automatic handling depth adjustment devices, emergency adjustment of the handling depth cannot actually be performed. There was a drawback.

Furthermore, although it is desired to quickly adjust the handling depth when going around the field or at the end of cutting, there is a problem in that it is not possible to do so.

The present invention has been made in view of the above circumstances, and it detects the presence or absence of a grain culm to be threshed on the conveyance route to the handling drum, and also detects the length of the grain culm to detect the presence of the grain culm. When the solenoid is energized by the operation of an automatic switch that opens and closes depending on the length detection result of the grain culm, this energization is performed intermittently to increase the handling depth. The purpose of the present invention is to provide an automatic processing depth adjustment device that avoids the hunting phenomenon during automatic adjustment, and can immediately and dynamically adjust the processing depth during manual adjustment. A detailed description will be given based on drawings showing examples.

FIG. 2 schematically shows the hydraulic circuit of the automatic handling depth adjustment device according to the present invention (hereinafter referred to as the device of the present invention) and the vertical conveyance chain 1, feed chain 2, etc. whose inclination angles are controlled by the hydraulic circuit. Automatic switches M and H that open and close by detecting the length of the grain culm are located in the handling barrel 3.
The automatic switch M is installed in front of the vertical conveyance chain 1. L is an automatic switch such as a limit switch installed in the middle of the vertical conveyance chain 1;
This is to detect that grain culms are being pinched and transported. The vertical conveyance chain 1 has hydraulic cylinders 4 so that its inclination angle can be changed by the operation of the hydraulic cylinders 4 constituting the hydraulic circuit.
The piston rod 4a is connected to the piston rod 4a. 5 is 4
A 3-position port switching type electromagnetic directional control valve,
The electromagnetic directional control valve 5 is activated by energizing the solenoid 5r.
moves to the switching position r, the piston rod 4a moves backward as shown by the arrow, the vertical conveyance chain 1 tilts toward the deep handling side, and the solenoid 5l is energized, so the electromagnetic directional control valve 5 moves to the switching position l. The hydraulic circuit is configured so that the piston rod 4a moves forward and the vertical conveyance chain 1 tilts toward the shallow handling side.

The electric circuit for controlling the on/off of current to the solenoids 5r and 5l is constructed as shown in FIG. That is, the solenoids 5r and 5l are switching circuits 6r and 6 using two transistors, respectively.
1 is connected in series between the positive electrode side of the battery 7 and body ground. This switching circuit 6
r and 6l become conductive when a switching control signal is input to their input ends 6r' and 6l', respectively, energizing the solenoids 5r and 5l, and an automatic switch is applied to the input ends 6r' and 6l', respectively. Normally closed contact Mb of M and normally open contact of automatic switch H
One end of Ha is connected. 8 is a pulse generator constructed using a timer IC commonly known as "555", and is turned on and off in a relatively short predetermined time width from the output terminal 8b by applying power to the input terminal 8a. Emit a pulse signal. The input terminal 8a of this pulse generator 8 is connected to the positive electrode side of the battery 7 via the normally open contact La of the automatic switch L, and the other ends of the normally closed contact Mb and the normally open contact Ha are connected together. and is connected to the output end 8b of the pulse generator 8. Reference numerals 9M and 9H are normally open type and automatic return type manual switches, which are attached to the driver's cab 10 shown in FIG. The manual switch 9M is connected in series with a resistor 11M, and this series circuit is connected between the positive electrode side of the battery 7 and the input terminal 6r' of the switching circuit 6r. On the other hand, the manual switch 9H is connected in series with a resistor 11H, and this series circuit is connected between the positive electrode side of the battery 7 and the input terminal 6l' of the switching circuit 6l. Note that 12 is a combine key switch that connects and disconnects the positive electrode of the battery 7 and the above-mentioned electric circuit. Also, solenoid 5
Diode 14r,1 connected in parallel to r,5l
4l is provided for surge absorption.

The operation of the apparatus of the present invention constructed as described above is as follows. That is, the harvested grain culm 13
is conveyed by the vertical conveyance chain 1, and the normally open contact La of the automatic switch L is closed.
Since the pulse generator 8 is energized, its output 8
A pulse signal is emitted from b. On the other hand, when the grain culm 13 is short, the tip of the grain culm 13 does not come into contact with any of the automatic switches M and H, so only the normally closed contact Mb of the automatic switch M is closed, and the grain culm 13 If the tip is long, the tip will touch both automatic switches M and H, so automatic switch H
Only the normally open contact Ha is closed. Therefore, grain culm 13
When is short (long), the pulse signal is input as a switching control signal to the input terminals 6r', 6l' of the switching circuits 6r, 6l via the normally closed contact Mb (normally open contact Ha). , the switching circuit 6 only during the time that the pulse signal is in the on state.
r and 6l become conductive, and solenoids 5r and 5
1 is intermittently energized depending on the on/off time width of the pulse signal. Therefore, the electromagnetic directional control valve 5 is repeatedly switched between the switching positions r, l and the neutral position n, and due to this repeated switching, the vertical conveying chain gradually tilts toward the deep handling (shallow handling) side, and the grain is The tip of the culm 13 contacts only the automatic switch M,
The above-mentioned repeated switching is performed until the automatic switch H is not contacted and both the normally closed contact Mb and the normally open contact Ha are in the open state. In this way, according to the device of the present invention, by intermittently energizing the solenoids 5r and 5l, the tilting of the vertical conveyance chain 1, that is, the handling depth adjustment, can be performed directly and immediately upon the operation of the automatic switches M and H. Since the process is performed gradually without moving, there is no risk of causing the hunting phenomenon described above. Note that although the energization of the solenoids 5r and 5l and the switching of the oil passages by the electromagnetic directional control valve 5 are performed intermittently, the rise and fall characteristics when the oil pressure rises and falls in the hydraulic circuit are slow, so vertical conveyance is not possible. Chain 1 performs a smooth tilting motion and does not perform an unnatural pulse-like tilting motion.

Next, when manually adjusting the handling depth, by turning on the manual switches 9M and 9H, the resistors 11 are connected to the input terminals 6r' and 6l' of the switching circuits 6r and 6l.
Since a voltage determined by the resistance values of M and 11H is applied, the switching circuits 6r and 6l become conductive, and while the manual switches 9M and 9H are turned on, the solenoids 5r and 5l are energized. This causes the vertical conveyance chain 1 to tilt toward the deep handling (shallow handling) side. In this case, solenoid 5
Since the energization of r, 5l is carried out continuously, independently of the operation of the pulse generator 8, the treatment depth can be adjusted very quickly and the purpose of manual emergency adjustment is fulfilled.

As described in detail above, the automatic handling depth adjustment device for a combine harvester according to the present invention is equipped with a sensor that detects the presence or absence and length of grain culms to be threshed on the conveyance route to the handling drum, and The handling depth can be automatically adjusted by changing the relative position of the grain culm according to the detected length, and the handling depth can be manually adjusted by manually changing the relative position of the grain culm to the grain handling barrel. When the presence of a culm is detected, if the length detection result of the grain culm indicates that the relative position should be changed, the relative position changing means is intermittently driven, and when the manual operation is performed, the relative position is changed. Since the change means is continuously driven, when automatic adjustment is performed, the vertical conveyance chain is gradually tilted by intermittent energization to the solenoid, so that smooth handling can be achieved without causing any hunting phenomenon. Depth adjustment is made. In the case of manual adjustment, the solenoid is continuously energized and the vertical conveyance chain is tilted quickly, so there is an advantage that emergency adjustment of the handling depth is possible.

Further, at the end of the field or at the end of mowing, the normally open contact La of the automatic switch L, which detects the presence or absence of grain culms to be threshed, is opened.

Therefore, the handling depth is not automatically adjusted and must be adjusted manually, but manual adjustment can be done by continuously driving the relative position changing means, that is, the hydraulic cylinder, so it can be quickly adjusted. It is possible.

Note that in the above embodiment, the solenoids 5r,
The pulse generator 8 is used as an intermittent switching member that energizes 5L intermittently at predetermined time intervals. Using the repeating timer switch 8', the fourth
As shown in the figure, it is also possible to adopt a circuit configuration in which a positive voltage can be applied intermittently to the input terminals 6r', 6l' of the switching circuits 6r, 6l.

It is also possible to configure the intermittent switching member such as the pulse generator 8 or the timer switch 8' so that the time width of energization and intermittent periods can be changed. It is possible to change the handling depth adjustment speed during automatic adjustment depending on the magnitude of the variation in the depth of the water.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, in which FIG. 1 is a perspective view of the outer shape of the combine, FIG. 2 is a schematic diagram of the hydraulic circuit of the device of the present invention, and FIGS. 3 and 4 are the devices of the present invention. FIG. 1...Vertical conveyance chain, 2...Feed chain, 3...Handling cylinder, 4...Hydraulic cylinder, 5...Solenoid directional control valve, 6r, 6l...Switching circuit, 8...Pulse generator, 9M , 9H...Manual switch, L, M, H...Automatic switch.

Claims (1)

[Claims] 1 Equipped with a sensor that detects the presence or absence and length of the grain culm to be threshed on the conveyance path to the handling drum, and automatic handling depth adjustment that changes the relative position of the grain culm with respect to the handling drum according to the detected length. It is possible to manually adjust the handling depth by changing the relative position of the grain culm to the handling barrel by manual operation, and when the presence of the grain culm is detected, the length detection result of the grain culm is relative. A combine harvester characterized in that the relative position changing means is driven intermittently when the position needs to be changed, and the relative position changing means is continuously driven during the manual operation. Automatic handling depth adjustment device.