JPS6237928B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a warning device for a combine harvester, and more specifically, when an abnormality occurs in a sensor of an automatic handling depth adjustment device, an automatic cutting height adjustment device, or an automatic steering device. This invention relates to a combine harvester alarm device that issues an alarm.

The automatic handling depth adjustment device of conventional combine harvesters is
As shown in Fig. 2, before the harvested grain culms, which are held in the vertical conveyance chain 1, are conveyed to the feed chain 2 and fed to the handling cylinder, a limit switch, etc. is installed in front of the entrance of the handling cylinder. Two detection switches M, H
An electromagnetic directional control valve equipped with a solenoid that detects the length of the grain culm and controls energization on and off according to the detection result is provided, and the oil path of the hydraulic circuit is switched by the electromagnetic directional control valve. , by changing the inclination angle of the vertical conveyance chain 1 connected to the hydraulic cylinder in the hydraulic circuit and changing the part of the grain culm to be pinched by the feed chain 2, depending on the length of the grain culm. It was used to adjust the depth of treatment. The relationship between the hydraulic circuit of this automatic handling depth adjustment device and the vertical conveyance chain 1, feed chain 2, etc. whose inclination angle is controlled by this is the third one.
Schematically illustrated in the figure. Detection switches M and H, which open and close by detecting the length of the grain culm, are arranged in front of the entrance where the grain culm is fed to the handling cylinder 3, and the detection switch M is installed near the vertical conveyance chain 1. There is. L is a detection switch such as a limit switch disposed in the middle of the vertical conveyance chain 1, and is used to detect that grain culms are being conveyed in the vertical conveyance chain 1 in a pinched state. The vertical conveyance chain 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 SOLr is energized, the electromagnetic directional control valve 5 is placed in the switching position r, and the piston rod 4a moves back as shown by the arrow, allowing vertical conveyance. The chain 1 stands up and moves to the deep handling side, and the electromagnetic directional control valve 5 moves to the switching position 1 by energizing the solenoid SOLl, and the piston rod 4a moves forward to overturn the vertical conveyance chain 1 and perform shallow handling. tilt to the side. 6 is a hydraulic pump, which constitutes a hydraulic circuit. The solenoids SOLl and SOLr of the electromagnetic directional control valve 5 are controlled by the opening and closing of detection switches H and M, and are energized by an electric circuit not shown in FIG. Therefore, in the threshing state where the handling depth is automatically adjusted, if weeds or the like wrap around one of the detection switches H while the grain culms are being transported, the detection switch The circuit becomes closed in the same way as when it comes into contact with the switch, energizes the solenoid SOLl, tilts the vertical conveyance chain 1 toward the shallow handling side, and by continuing this state, it adjusts to the length of the grain culm. There is a risk that it will not be possible to adjust the handling depth, and since the solenoid SOLl is energized for a long time, there is a risk that the solenoid SOLl may overheat and burn out, or the hydraulic circuit may malfunction due to overheating of the pressure oil. be. In addition to malfunctions in the electric circuit as described above, overheating of the solenoid can also occur when oil leaks in the hydraulic circuit and the hydraulic cylinder 4 does not operate as controlled by the detection switch M or H. There is a risk that failure of the automatic handling depth adjustment device will increase.

In view of the above-mentioned drawbacks, the present invention quickly detects an abnormality in the detection state when an abnormal detection operation occurs, such as when something other than a grain culm contacts the detection switch and closes the switch, and the closed state continues. The present invention provides a device which issues a warning to the operator of the combine harvester, and which only issues the warning when automatic control is activated. Hereinafter, the present invention will be explained in detail with reference to the drawings.

In FIG. 1, 7 is a battery, 8 is a key switch for turning on and off electricity to the electric circuit of the combine, and the negative electrode of the battery 7 is grounded to the body of the combine. Reference numeral 9 denotes a normally open, automatic return type manual switch for shallow handling, which is connected in series with the solenoid SOL1 between the positive and negative electrodes of the battery 7, which is turned on and off by the key switch 8. 10 is an automatic/manual changeover switch, La ₁ , which switches between automatic and manual to adjust the handling depth automatically or manually.
is the normally open contact of the detection switch L that opens and closes by detecting that the grain culm is being conveyed, and Ha ₁ and Mb ₁ are the normally open contacts of the detection switches H and M that open and close by detecting the length and shortness of the grain culm being conveyed, respectively. Open and normally closed contacts,
SOLl and SOLr are solenoids of the electromagnetic directional control valve 5, respectively. and automatic manual changeover switch 10,
Normally open contact La ₁ of detection switch L, detection switch H
The normally open contact Ha ₁ and the solenoid SOLl are connected in series between the positive and negative electrodes of the battery 7 via the key switch 8 . The normally closed contact Mb ₁ of the detection switch M is connected in series with the solenoid SOLr, and the normally open contact Ha ₁ and the solenoid SOLl are connected in parallel between both ends of the solenoid SOLr. Reference numeral 11 denotes an automatic return type manual switch for deep handling, which is connected in parallel between both ends of the automatic manual changeover switch 10, a normally open contact La ₁ , and a normally closed contact Mb ₁ connected in series. 12 is an alarm device such as a buzzer or indicator lamp that indicates an alarm, and La ₂ is a normally open contact of the detection switch L.
Normally open contact linked to La ₁ , Ha ₂ is detection switch H
The normally open contact Ha ₁ of the detection switch M is a normally open contact, and Mb ₂ is a normally closed contact that is interlocked with the normally closed contact Mb ₁ of the detection switch M. T ₁ and T ₂ are timer relays, and their timing circuits T ₁ C and T ₂ C start timing operation when electricity starts, and after the set time limit elapses, the time limit contacts T ₁ a,
T ₂ a is closed and the current is stopped, so the timing circuit T ₁ C,
The timing at T ₂ C returns to zero. This timer relay T ₁ ,
The opening time of the time-limited contacts T ₁ a and T ₂ a at T ₂ is handled and opens after the normally open contact Ha ₁ or normally closed contact Mb ₁ closes when automatic depth adjustment is performed normally. It is set to a slightly longer time than the previous time. The alarm 12 and the time limit contact T ₁ a are connected in series, one end of the alarm is connected to the connection point between the automatic manual changeover switch 10 and the normally open contact La ₁ , and one end of the time limit contact T ₁ a is connected to the aircraft body. be. Normally open contacts La ₂ , Ha ₂
and a clock circuit T ₁ C are connected in series and connected between the positive and negative electrodes of the battery 7 via the key switch 8. Further, the normally closed contact Mb ₂ and the clock circuit T ₂ C are connected in series, and the normally open contact Ha ₂ and the clock circuit T ₁ C, which are connected in series, are connected in parallel between both ends. Further, the time limit contact T ₂ a is connected in parallel with the time limit contact T ₁ a.

Next, the operation of the alarm circuit shown in FIG. 1 according to the present invention will be explained. Now, close the key switch 8 to drive the combine harvester, and switch the automatic/manual changeover switch 10.
When the handling depth is adjusted automatically by closing the culm, when grain culms are transported to the vertical transport chain 1, the normally open contacts La ₁ and La ₂ of the detection switch L, which detects the transport, are first activated.
becomes a closed circuit. Next, in the case of a long grain culm, the grain culm comes into contact with both detection switches H and M, resulting in a normally open contact.
Ha ₁ and Ha ₂ are closed and the normally closed contact of detection switch M
Mb ₁ and Mb ₂ are opened to energize the solenoid SOLl and the timing circuit T ₁ C to tilt the vertical conveyance chain 1 toward the shallow handling side, and the timer relay T ₁ starts timing operation.

On the other hand, when a short grain culm is transported, the rice ears do not come into contact with either of the detection switches M and H, and the normally open contacts La ₁ and La ₂ of the detection switch L and the normally closed contacts Mb ₁ and Mb of the detection switch M ₂ is closed, the solenoid SOLr and the timing circuit T ₂ C are energized to tilt the vertical conveyance chain 1 toward the deep handling side, and the timer relay T ₂ operates to start timing operation. Therefore, if, for example, weeds, straw debris, etc. wrap around the detection switch H during grain culm transportation and the closed path continues, the vertical conveyance chain 1 tilts toward the shallow rowing side and the rice ears come into contact with the detection switch H. The normally open contacts Ha ₁ and Ha ₂ of the detection switch H remain open even after the point in time when the
If the timer relay T 1 does not recover, when the timing operation of the timer relay T ₁ is completed, that is, the time limit has elapsed, the time limit contact T ₁ a is closed and the alarm 12 is energized to immediately prevent the malfunction of the detection switch. Issue an alarm. If there are no weeds or the like entangled, the energization to the timing circuit T ₁ C is stopped within the set time limit, the timing circuit T ₁ C returns to zero, and no alarm is issued.
In the detection switch M, if the normally closed contacts Mb ₁ and Mb ₂ of the detection switch M continue to be closed for a long time for some reason, the timer release is activated in the same way.
A timing operation is performed at T ₂ , and an alarm is issued when the time limit has elapsed.

In addition, in the alarm circuit shown in Figure 1, the timer
By using only timer relay T ₁ without using T ₂ and connecting normally open contact Ha ₂ and normally closed contact Mb ₂ in parallel, one timer relay T ₁ can handle the malfunction of two detection switches H and M. Alternatively, the same alarm operation as described above may be performed. On the other hand, when adjusting the handling depth manually, the automatic manual changeover switch 10 is opened, and the solenoid SOLl or SOLr is energized by the manual switch 9 for shallow handling or the manual switch 11 for deep handling. The vertical conveyance chain 1 is then tilted, but in this case, the alarm 12 is not activated because the switch 10 is opened. However, in this case, even if weeds, straw waste, etc. get wrapped around the detection switches H and M, it will not affect the adjustment operation of the handling depth, so there will be no hindrance to the harvesting operation, and in fact, it will cause unnecessary alarm activation. It is preferable because it is not bothersome.

It is preferable to use timer relays T ₁ and T ₂ with variable time limit settings, and when using such timer relays, the timer relays can be adjusted depending on the frequency of adjustment of the handling depth or changes over time in the operating characteristics of the hydraulic cylinder. This makes it possible to arbitrarily select the time at which the alarm is issued. Furthermore, in this embodiment, we have described a circuit that warns when the automatic cutting depth adjustment function of the combine has become impossible, but this warning device is an automatic cutting height adjustment device that can also be operated manually. Of course, the present invention can also be applied to automatic steering devices.

As detailed above, the combine harvester alarm device according to the present invention provides automatic control in a combine harvester equipped with a device that selectively performs automatic control based on the output of sensors such as the detection switches H and M, and control by manual operation. The operation of the sensor is characterized by having means for issuing an alarm when the sensor continuously emits an output associated with a predetermined state of the detection target for a predetermined period of time or more. It is possible to accurately identify whether this is due to normal contact with an ear of rice or a malfunction caused by weeds or the like wrapped around the sensor. Therefore, there is no risk of threshing without automatic adjustment of the handling depth, etc., and there is no possibility of threshing with defects such as unhandled grain. In addition, when the detection switch H that detects a long grain culm is wrapped around a weed or the like and its contact is closed, the detection switch M that detects a short grain culm is also closed, and the two of the electromagnetic directional control valves are closed. There is no need to continue energizing two solenoids at the same time, and there is no need to overheat the solenoid by unnecessarily energizing it for a long time, so the electromagnetic directional control valve can be easily controlled and its lifespan can be extended. In the present invention, unnecessary alarms are not issued during manual operation, and conversely, during automatic control in which the automatic manual changeover switch is closed, an alarm can be issued for sensor abnormalities without any special operation for alarming. Therefore, it is convenient to handle. It goes without saying that similar effects can also be achieved when the present invention is applied to an automatic cutting height adjustment device or an automatic steering device.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of an alarm device according to the present invention,
FIG. 2 is an external view of the combine harvester, and FIG. 3 is a schematic diagram of the hydraulic circuit of the automatic handling depth adjustment device. 1...Vertical conveyance chain, 2...Feed chain,
3... Handling cylinder, 4... Hydraulic cylinder, 5... Solenoid directional control valve, SOLl, SOLr... Solenoid, L, M, H... Detection switch, La ₁ , La ₂ , Ha ₁ , Ha ₂ ... Normally open contact,
Mb ₁ , Mb ₂ ... Normally closed contact, T ₁ , T ₂ ... Timer relay.

Claims (1)

[Claims] 1. In a combine harvester equipped with a device that selectively performs automatic control based on the output of a sensor and control based on manual operation, the combine harvester performs automatic control, and the sensor outputs an output associated with a predetermined state of the detection target. 1. A warning device for a combine harvester, comprising means for issuing an alarm when the alarm continues for a predetermined period of time or more.