JPH035224Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention is based on a hydraulic system for a combine harvester, specifically a reaping lift actuator that lifts and lowers the reaping section.
The present invention relates to a hydraulic system for a combine harvester, which is equipped with an auger elevating actuator for elevating and lowering a grain discharge auger, and in which the actuator is actuated by hydraulic fluid from one hydraulic pump.

(Prior art) Generally, in a combine harvester with a grain tank specification, that is, a combine harvester that has a grain tank mounted on the machine body and discharges the grains in the grain tank to the outside via an auger, the reaping part is raised and lowered. The method includes a reaping lifting actuator to be operated and an auger lifting actuator to lift and lower the auger, and during reaping and threshing work, the cutting height of the reaping section is adjusted by the reaping lifting actuator, and the grain culm is cut at a predetermined cutting height. Reaping, the reaped grain culms are threshed in a threshing section, and the grains are stored in the grain tank, and when a predetermined amount of grains are stored in the grain tank, the auger is activated by the auger lifting actuator. The grains in the grain tank are discharged to the outside by the auger.

In order to operate each of the actuators, there has been a conventional hydraulic system in which one hydraulic pump is used to operate each of the actuators via an electromagnetic switching valve. This is well known in Publication No. 11138 and the like.

(Problems to be Solved by the Invention) By the way, when the actuators are connected to one hydraulic pump via a plurality of electromagnetic switching valves as described above, the same number of switching valves as actuators are required. Furthermore, it is very dangerous to operate the actuators at the same time if the actuators are operated incorrectly.

That is, for example, if the reaping section operates automatically during the operation of discharging grains using the auger, there is a risk that the reaping section may come into contact with the operator, which is very dangerous. On the other hand, if the auger operates without permission during the reaping and threshing operation, there is a risk that the auger may be damaged.

(Means for solving the problems) In order to solve the above problems, the present invention
Connecting the operating lines of each actuator to a switching port of a switching valve provided on the discharge side of the hydraulic pump, and providing a selection valve on the operating line,
A reaping line for operating the reaping lifting actuator and an auger line for operating the auger lifting actuator are connected to the selection valve in parallel.

(Function) When reaping and threshing the grain culm while the combine harvester is running, the selection valve is switched to the reaping line side, so that the auger lifting actuator is not allowed to operate and the reaping lifting/lowering actuator is not allowed to operate. When only the actuator is operated and grains are discharged from the grain tank via the auger, the selection valve is switched to the auger line side to disable the operation of the reaping lift actuator and to disable the auger lift actuator. It was as if only the system was activated.

(Example) The hydraulic system for a combine harvester according to the present invention will be explained below with reference to an example shown in the drawings.

The combine shown in the drawing includes a traveling device 2 at the bottom of a machine body 1, and a threshing section 3 and a grain tank 4 at the top.
In addition, a reaping section 5 is provided in the front part of the fuselage 1, while a steering column 6 and a pilot's seat 7 are provided in the front part of the grain tank 4 on the fuselage 1.

As the machine body 1 travels during work, grain culms are harvested by the reaping section 5, and the harvested grain culms are threshed by the threshing section 3, and the grains are transferred to the grain tank 4.
It is as if it is housed inside.

Further, the grain tank 4 is equipped with a grain discharge auger 8, and the grain tank 4 is equipped with a grain discharge auger 8.
It is as if the grain inside is expelled to the outside.

Between the machine body 1 and the reaping section 5, the reaping section 5 is provided.
A reaping lifting actuator 9 is provided for raising and lowering the reaping section 5. By operating the actuator 9, the reaping section 5 can be raised and lowered, thereby making it possible to adjust the cutting height of the reaping section 5.

Further, the auger 8 is provided with an auger elevating actuator 10, and the auger 8 is raised and lowered by operating the actuator 10.

Each of the actuators 9 and 10 is connected to one hydraulic pump 11, and the actuators 9 and 10 are operated with hydraulic oil from this one pump 11.

In the above configuration, the actuation line 13 of the actuators 9 and 10 is connected to the switching port of the switching valve 12 provided on the discharge side of the hydraulic pump 11, and the selection valve 1 is connected to the actuating line 13.
4, and a reaping line 15 that causes the selection valve 14 to operate the reaping lifting actuator 9.
and an auger line 16 for operating the auger lifting actuator 10 are connected in parallel.

Specifically, as shown in FIG. 2, an electromagnetic switching valve 12 is provided on the discharge side of the hydraulic pump 11, the operating line 13 is connected to the switching port of the switching valve 12, and a check valve 17 is connected to the line 13. The selection valve 14 having a switching lever 14a is connected thereto, and the reaping line 15 and the auger line 16 are connected to the discharge port of the selection valve 14. Actuator 9 and the auger actuator 10
Thus, by switching the selection valve 14 using the switching lever 14a,
The lines 15 and 16 are selected to allow the actuators 9 and 10 to operate alone without causing the actuators 9 and 10 to operate simultaneously.

In the embodiment shown in FIG. 2, a first switching valve 18 and a second switching valve 19 are connected to a switching valve 12 connected to the hydraulic pump 11, and the automatic operation of the traveling device 2 is connected to the first switching valve 18. The direction control mechanism 20 is connected so that automatic steering of the traveling device 2 is performed via the automatic steering control mechanism 20 by switching the first switching valve 18, and the second switching valve 1
9 is connected to an automatic handling depth control mechanism 21, so that the automatic handling depth control mechanism 21 can be automatically controlled by switching the second switching valve 19. The auger lifting actuator 10 is configured to operate alternatively to the reaping lifting actuator 9 by an electric circuit that constitutes the automatic cutting height control mechanism of the reaping section 5. The actuator 10 can be operated only during the off operation. That is, as shown in FIG. 3, the selection valve 14 is provided with a switch 22 which is turned on and off by the switching lever 14a.

As shown in FIG. 4, a controller 23 connected to a power source E via a key switch SW-1 is provided with a setting input device 24 for setting the cutting height of the cutting section 5 to high, medium, or low positions; A cutting height position sensor 25 having three switches for detecting the cutting height position of the cutting section 5 is connected, and an automatic cutting height switch 2 is connected to the input side of the setting input device 24.
6 is connected to the solenoid 2 of the electromagnetic switching valve 12 which controls the controller 23 by switching the actuators 9 and 10 to the ascending and descending sides.
7 is connected to the controller 23, and a manual switch 28 is also connected to the controller 23, which switches the switching valve 12 and allows manual operation of one of the actuators 9, 10 to the upward or downward direction.

Then, the switch 22 of the selection valve 14 is connected to the power supply side of the automatic switch 26, and the controller 2 of the cutting height position sensor 25 is connected to the power supply side of the automatic switch 26.
On the 3 side, a NAND circuit 29 having three input terminals is connected to each switch of the cutting height position sensor 25, and on the output side of the NAND circuit 29, an OR circuit 30 having two input terminals is provided. The other input terminal of this OR circuit 30 is connected to the switch 22 of the selection valve 14 and the automatic switch 26.
Connect between.

Also, a solenoid 3 is connected to the output side of the OR circuit 30.
1, and on the controller 23 side of the manual switch 28, raise the switch 28,
Two switches 32, 32, which are operated by the solenoid 31, are installed in the descending line.

In this way, when the switching lever 14a is operated to swing as shown by the solid line in FIG.
2 is turned on to enable automatic control of the actuator 9 by the setting input device 24 and the cutting height position sensor 25, that is, automatic cutting height adjustment of the cutting section 5. One of the switches in the position sensor 25 turns off, and this off operation causes the NAND circuit 29 to turn off the OR circuit 30.
A low signal is output to one input terminal of the OR circuit 30, and a high signal is output to the other terminal of the OR circuit 30 when the switch 22 in the selection valve 14 is turned on. Further, when all the switches of the position sensor 9 are turned off, the input from the NAND circuit 29 to the OR circuit 30 becomes a high signal, and in any case, the output from the output side of the OR circuit 30 is a high signal. Therefore, the solenoid 31
is held in an energized state, and the switches 32 connected to the up and down lines of the manual switch 28 are held in a closed state, thereby making it possible to operate the solenoid 27.

Furthermore, when the lever 14a is swung as shown by the imaginary line in FIG. 3 and the selection valve 14 is used to control the elevation of the auger elevating actuator 10, the switch 22 of the selection valve 14 is turned off. The actuator 1
The lifting operation of step 0, that is, the grain discharge operation by the auger 8, is performed when the reaping section 5 is not in the lowered state.
The output of the OR circuit 30 becomes a low signal and the solenoid 31 is de-energized, so the discharge operation cannot be performed. However, when the reaping section 5 is in the lowered position, the output of the OR circuit 30 is Since the signal becomes high and the solenoid 31 is energized, the discharge operation is performed in this state. That is, when all the switches of the cutting height position sensor 25 are in the ON state, a high signal is output from the NAND circuit 29 to one input terminal of the OR circuit 30, while the other input terminal of the OR circuit 30 is in the ON state. Since a low signal is not input to the terminal due to the OFF operation of the switch 22, a high signal is output from the OR circuit 30, and this signal excites the solenoid 31, causing the manual switch 28 to rise and Each switch 32 installed in the descending line is closed, and the manual switch 28 can operate the switching valve 12, that is, the auger lifting actuator 10.

The hydraulic system of the combine harvester according to the present invention is constructed as described above, and the selection valve 14 is switched to the reaping line 15 side during reaping and threshing work, and by doing so, the hydraulic oil of the hydraulic pump 11 is used to control the reaping lifting actuator. 9 is activated, and the cutting height of the cutting section 5 is adjusted by the actuator 9.

Further, when the grains in the grain tank 4 are discharged to the outside via the auger 8, the selection valve 14 is switched to the auger line 16 side, and the hydraulic pump 11 is switched only when the reaping section 5 is in the lowered position. The auger elevating actuator 10 is actuated by the hydraulic oil, and the auger 8 is adjusted in elevating and lowering by the actuator 10.

(Effect of the invention) As explained above, in the hydraulic system for a combine harvester according to the invention, the operation lines of the reaping lifting actuator and the auger lifting actuator are connected to the switching port of the switching valve provided on the discharge side of the hydraulic pump. A selection valve is provided in the line, and the reaping line for operating the reaping lifting actuator and the auger line for operating the auger lifting actuator are connected in parallel to the selection valve. When one of the actuators is operated by operating the selection valve, the other actuator is prevented from operating;
In other words, the simultaneous operation of both actuators is prevented, and therefore the reaping and threshing work by the reaping section and the grain discharge work from the grain tank by the auger can be safely performed, and moreover, one of the actuators can be safely operated. When the actuator is in operation, the other actuator is deactivated. Therefore, the hydraulic oil for operating both actuators can be shared, reducing the amount of hydraulic oil required.
The oil tank can be made smaller.

[Brief explanation of drawings]

Figure 1 is a perspective view of a combine that implements the hydraulic system of the present invention, Figure 2 is a hydraulic circuit diagram of the hydraulic system, Figure 3 is a partially cutaway enlarged view of the selection valve, and Figure 4 is an electrical control circuit diagram. be. 5... Reaping section, 8... Grain discharge auger, 9...
Reaping lifting actuator, 10... Auger lifting actuator, 11... Hydraulic pump, 12... Switching valve, 13... Operating line, 14... Selection valve, 1
5... Reaping line, 16... Auger line.

Claims (1)

[Scope of utility model registration request] A combine harvester comprising a reaping lifting actuator 9 for lifting and lowering a reaping section 5 and an auger lifting actuator 10 for lifting and lowering a grain discharge auger 8, and in which the actuators 9 and 10 are operated by hydraulic oil from one hydraulic pump 11. In the hydraulic system, the actuating line 13 of the actuators 9 and 10 is connected to the switching port of the switching valve 12 provided on the discharge side of the hydraulic pump 11, and the operating line 13 is provided with a selection valve 14, and the selection valve 14 is connected to the switching port of the switching valve 12 provided on the discharge side of the hydraulic pump 11. A hydraulic system for a combine harvester, characterized in that a reaping line 15 for operating the reaping lifting actuator 9 on a valve 14 and an auger line 16 for operating the auger lifting actuator 10 are connected in parallel.