JPH0127624Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides an electric control mechanism that automatically operates the operating valve of a hydraulic actuator for raising and lowering the reaping section so that the height of the reaping section above the ground is within a set range. The mowing height is maintained almost constant regardless of the forward and backward inclination of the traveling machine by outputting a pulse signal to the section, and the operating valve is intermittently operated to the actuator drive position for mowing. The present invention relates to a reaping section operating structure of a harvester configured to suppress excessive upward or downward movement due to the inertia of the section.

Conventionally, in the above-mentioned harvesting machine, when starting work, especially early in the process or in cold regions, the hydraulic oil is in a low temperature and highly viscous state, which slows down the pressure oil supply speed to the actuator, resulting in control delays. .
To prevent this, if you increase the pump's discharge capacity so that the pressure oil can be supplied quickly even when the oil temperature is low, it is possible to prevent the hydraulic oil from running out after some time has passed since the start of work. As the temperature rises and the viscosity becomes low, the pressure oil supply speed to the actuator increases, causing a disadvantage that excessive upward movement or excessive downward movement due to the inertia of the reaping section becomes significant.

The purpose of this invention is to maintain the actuator's operating speed constant regardless of oil temperature changes.
Moreover, the purpose is to make it easy to modify.

The characteristic configuration of the present invention is that in the above-mentioned reaping section operation structure of the harvester, a sensor is provided to detect the temperature of the hydraulic oil for the hydraulic actuator, and the higher the temperature of the hydraulic oil, the more the control mechanism outputs the output within a unit time. The operation valve is controlled so that the overall time for the operation valve to reach the actuator drive position is shortened by the pulse signal outputted from the control mechanism within a unit time, and the lower the hydraulic oil temperature is, A signal operation mechanism is provided that automatically adjusts the pulse signal based on information from the sensor so that the total time when the actuator is in the actuator drive position is longer.The functions and effects thereof are as follows.

That is, when the hydraulic oil temperature changes, the signal operating mechanism automatically changes and adjusts the total time so that the oil supply speed to the actuator remains constant regardless of the oil temperature change. Therefore, the operating speed of the actuator can be kept constant regardless of changes in oil temperature, so there is no control delay even when work starts early in the morning, and control remains stable without hunting even after the temperature of the hydraulic oil rises. It was made to be carried out in Moreover, since speed control is performed automatically, it is advantageous in terms of operation. Furthermore, in order to adjust the oil supply speed based on the oil temperature detection results, we adopted a means to adjust the pulse signal originally output for valve operation, so it is possible to automatically operate the throttle valve in the oil path. Compared to conventional methods, the simple modification of adding a signal operating mechanism was required, and it was economically advantageous to be able to maintain the cutting height consistently and accurately, while also being able to work efficiently.

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

As shown in FIG. 1, a reaping section 4 consisting of a lifting device 1 for the planted grain culm, a reaping device 2, a device 3 for transporting the reaped grain culm rearward, etc. A threshing unit 5 for the culm, and
A combine harvester, which is an example of a harvester, is constructed by being connected to the front of a crawler-type traveling body having a driving section 6 and the like.

The mowing section 4 is configured to be swung up and down around an axis P by a cylinder 7, which is an example of a hydraulic actuator, to adjust the mowing height. A sensor 8 that transmits and receives ultrasonic waves for detecting the height of the reaping section 4 above the ground is attached to the reaping section 4 so as to be able to move up and down, and as shown in FIG. It is linked to the operation valve 10 of the cylinder 7. The control mechanism 9 detects the height of the reaping section 4 above the ground based on the time required from when the sensor 8 emits a sound wave until it receives a reflected sound wave from the ground, and also uses the detected height and the setting device 11 to Compare with the set height, and based on this comparison result, set the detection height to be within the set range.
Electromagnetic operation parts 10a and 10 of the operation valve 10
It is configured to automatically operate the operating valve 10 by outputting a pulse signal A to the terminal b. A sensor 12 for detecting the temperature of hydraulic oil relative to the cylinder 7 is attached to the operation valve 10, and a signal operation mechanism 14 linked to the sensor 12 and the storage device 13 is attached to the control mechanism 9. ,
As the oil temperature changes, the pulse signal A output from the control mechanism 9 is automatically adjusted as follows. That is, the memory device 13 stores that when the oil temperature is at a certain value, the operating valve 1 is controlled by the pulse signal A output from the control mechanism 9 within a unit time t.
0 is stored in the cylinder driving position, and the signal operating mechanism 14 is connected to the sensor 12.
The control mechanism 9 is configured to output a signal so that the pulse signal A to be output from now on is in accordance with the data based on the input information from the control mechanism 9. In other words, the pulse signal A when the hydraulic oil temperature is high is shown in Figure 3A, and the pulse signal A when the hydraulic oil temperature is low is shown in Figure 3B. The control mechanism 9 is configured to output a pulse signal for driving the cylinder 7 in a state where the total time of the cylinder drive operation signal part a becomes shorter as the hydraulic oil temperature is higher than when the hydraulic oil temperature is lower. be.

More specifically, regardless of the longitudinal inclination of the traveling machine body, the reaping section 4 is controlled to rise and fall so that its height above the ground is within a set range, and this control is controlled by pulse signals to prevent the reaping section from rising too high. The mowing is performed in a state in which mowing is suppressed from falling too low and in a state in which the expansion and contraction speed of the cylinder 7 is kept almost constant regardless of changes in oil temperature, so that the work can be carried out while maintaining the mowing height accurately and constant.

In order to adjust the pulse signal so that the operating speed of the cylinder 7 is constant regardless of the oil temperature, the length of the cylinder drive operation signal part a is kept constant and the number of transmissions per unit time is changed. It's okay.

The provision of the temperature sensor 12 is advantageous because when it is attached to the operating valve 10, the temperature can be detected near the cylinder 7, and the speed can be controlled in a state that is highly adapted to the temperature of the oil located in the cylinder 7. It can also be attached to the tank.

[Brief explanation of the drawing]

The drawings show an embodiment of the reaping section operation structure of a harvester according to the present invention, in which FIG. 1 is a side view of the front part of the combine, FIG. 2 is a block diagram, and FIG. 3 is an explanatory diagram of pulse signals. 4...Reaping section, 7...Hydraulic actuator, 9
...Control mechanism, 10...Operation valve, 10a, 1
0b...Operation unit, 12...Sensor, 14...Signal operation mechanism, t...Unit time, A...Pulse signal.

Claims (1)

[Claims for Utility Model Registration] Electric control mechanism 9 that automatically operates the operation valve 10 of the hydraulic actuator 7 for raising and lowering the reaping section so that the height of the reaping section 4 from the ground falls within a set range.
, the operation parts 10a, 10 of the operation valve 10
A reaping section operation structure of a harvester is provided in a state where a pulse signal A is outputted at a terminal b, and a sensor 12 is provided to detect the temperature of hydraulic oil for the hydraulic actuator 7, and the higher the hydraulic oil temperature is, the more the control mechanism 9 The total time for the operation valve 10 to reach the actuator drive position by the pulse signal A output within the unit time t is shortened, and the lower the hydraulic oil temperature is, the lower the control mechanism 9 is. so that the total time for the operating valve 10 to reach the actuator drive position is increased by the pulse signal A output from the
A reaping section operating structure of a harvester, which is provided with a signal operating mechanism 14 that automatically adjusts the pulse signal A based on information from the sensor 12. The structure according to claim 1, wherein the sensor 12 is attached to the operating valve 10.