JPH0446086B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a handling depth control device for a combine harvester, and more specifically, a handling depth control device that has a handling depth sensor in the middle of a grain culm conveying device and that performs inching control. The present invention relates to a processing depth control device.

(b) Prior Art Conventionally, a combine harvester 1, as shown in FIG.
It has a traveling body 3 supported by crawlers 2, and in front of the body 3, a preprocessing section 6 is supported by a pivot 5 so as to be rotatable up and down. Also,
The pretreatment section 6 includes a divider 7, a cutting blade 9, a grain culm lifting device 10, a raking device 11, and a tip conveyor 12.
Grain culm transport device 1 consisting of a and stock transport body 12b
The grain culm conveying device 12 receives grain culms from the raking device 11 and conveys them to the feed chain 13 of the threshing machine. Further, the grain culm conveying device 12 can be rotated around a pivot shaft 5 located at its downstream end, and the grain culm conveying device 12 can be rotated around a pivot shaft 5 at its downstream end, and the grain culm conveying device 12 can be adjusted to transfer the grain culm from the raking device 11 to the feed chain 13. The passing position, that is, the handling depth can be adjusted. Facing the middle position of the grain culm conveying device 12, a handling depth sensor 16 consisting of two ear tip sensor switches S1 and S2 is fixed to a bracket 15 fixed to the grain base conveying body 12b. The grain culm conveying device 12 is placed so that the grain tip is between these two switches S1 and S2, that is, switch S1 is turned off without contacting the grain tip, and switch S2 is turned on by contacting the grain tip.
The rotation is adjusted. In addition, in FIG. 2, S3 is a main sensor switch that detects whether or not the grain culm is flowing by the conveying device 12.

(c) Problems to be solved by the invention By the way, the handling depth sensor 16 is
At the front end of the grain culm, the grain is tilted forward, causing disturbances in the ears, making it impossible to accurately detect the culm length. Therefore, even if the grain culm is detected by the sensor 16 and the conveying device 12 is adjusted, the grain culm located in the section L that has already been delivered from the raking device 11 remains in the same state as before the adjustment. , the grain culm between the L's is detected again by the sensor 16, and the conveying device 12 is further adjusted to cause hunting. Therefore, the timer unit
The control signal is converted into an intermittent ON/OFF signal in response to continuous input signals to prevent the sensor 16 from detecting an inappropriate grain culm in section L again, but generally pre-processing is Each device in the section 6, that is, the cutting blade 9 lifting device 10, the raking device 11, and the grain culm conveying device 12, is linked to the reaping speed, whereas the off time of the intermittent signal of the timer unit is constant. I was getting used to it. For this reason, as shown in Figure 2, when the cutting speed is below a certain speed,
The conveying speed v of the conveying device 12 is also slow, and during the off time tb, which is a constant value, the unsuitable grain culm K before adjustment does not pass through the section L, and the unsuitable grain culm K1 (for example, handled too deeply) The sensor 16 detected this again, and even though it had already been properly adjusted (grain culm K2), it was adjusted more than necessary (in the direction of shallow handling), causing hunting.

(d) Means for Solving the Problem The present invention aims to solve the above-mentioned problems by detecting the cutting speed of the combine harvester 1, inputting the detected value to a timer unit that emits an intermittent signal, and detecting the cutting speed of the combine harvester 1. The off time of the timer unit is changed in inverse proportion to the conveying speed v of the grain culm conveying device 12 which is linked to the reaping speed, and the handling depth at which the grain culm delivered to the grain culm conveying device is detected is adjusted. The present invention is characterized in that the adjusting drive means of the grain culm conveying device is driven by a signal from a sensor.

(E) Effect Therefore, as shown in Fig. 3, the grain culm conveying device 1
2, the off time tb of the timer unit is set corresponding to the time it takes for the grain culm to pass through the section L, and when the transport speed v of the grain culm transport device 12 is slow, the off time tb of the timer unit is If the off time tb becomes longer and the grain culm K1 is not adjusted properly before the adjustment, and if the conveyance speed v is fast, the off time tb of the timer unit becomes shorter and it can quickly respond to changes in the grain culm length. Then, at the next on-time, the grain culm K2 that was adjusted last time is reliably detected, and if the result is inappropriate, the conveying device 12 is reliably detected.
is adjusted.

(d) Examples Hereinafter, examples that embody the present invention will be described.

In the driver's seat of combine harvester 1 (not shown), a fourth
As shown in the drawings and FIG. 5, a speed change lever 19 is provided, and the speed change lever 19 is connected to a continuously variable transmission (not shown) via a link 18. Further, two potentiometers VR1 and VR2 are arranged facing the boss portion 19a of the speed change lever 19, and these potentiometers are interlocked with the speed change lever 19 via an arm 20 and a pin 21. , the resistance value changes depending on the rotational position of the speed change lever 19.

Then, the shallow handling command switch S of the sensor 16
1. A deep handling command switch S2 and a main sensor switch S3 are connected as shown in FIG. In the figure, TU1 is a timer unit that transmits a signal H after a predetermined time delay based on a signal L on the input side, M is a motor that adjusts and drives the grain culm conveying device 12, and R1 and R2 are electromagnetic relays that control the motor M in forward and reverse directions. , Tr1 and Tr2 are transistors, 25 is
26 is a NOT circuit and a NOR circuit. and,
TU2 is a timer unit that converts a continuous input signal into an intermittent on/off signal (inching).
The off-time tb is adjusted by potentiometer VR1. Similarly, TU3 is a timer unit that converts a continuous input signal into an intermittent signal.
The off-time tb is adjusted by potentiometer VR2.

Since this embodiment has the above-described configuration, by operating the speed change lever 19, the reaping speed of the combine harvester 1 is changed/set, and at the same time, the transport speed v of the grain culm transport device 12 is changed in conjunction with the reaping speed.
is also set. In addition, by the rotation of the speed change lever 19, the potentiometers VR1 and VR2 are also changed and set via the pin 21 and the arm 20, and are linked to the rotation position of the speed change lever 19, and therefore the reaping speed and the grain culm conveying speed v. and potentiometer VR1,
The resistance value of VR2 is set. As a result, the off time tb of the timer units TU2 and TU3 is determined by the conveying speed v of the grain culm conveying device 12, as shown in FIG.
It is set at a time corresponding to the velocity v which changes inversely proportional to . That is, when the reaping speed is slow and the grain culm conveyance speed v is also slow, the off time corresponds to the time the grain culm passes through section L of the conveyance device 12.
tb is set to be long (tb = L/v), and when the grain culm conveyance speed v is high, the off time tb is set to correspond to the time for the grain culm to pass through section L.
is set short.

Then, the off time corresponding to the grain culm conveyance speed v
With timer units TU2 and TU3 set so that the inching timer unit TU2 and TU3 are set so that the inching timer unit TU2 and TU3 are set so that Relay R1 is turned on for a predetermined period of time to rotate motor M. This results in
The conveying device 12 is adjusted by a predetermined amount in the shallow handling direction.
Then, even if the switch S1 continues to be turned on, the timer unit TU2 is used to pause the time corresponding to the time when the grain culm passes through the section L, and even after the off time tb, the switch S1 is still turned on. In this case, the relay R1 is turned on for the first time, the motor M is rotated, and the conveying device 12 is further adjusted in the shallow handling direction. In addition, the grain culm tip does not contact switch S2,
When the switch S2 is also turned off, the NOT circuit 25
and the timer unit TU via the NOR circuit 26.
3 is activated, and relay R2 is turned on for a predetermined period of time via transistor Tr2 to rotate motor M in the opposite direction. As a result, the conveying device 12 is adjusted by a predetermined amount in the deep handling direction. Similarly, based on the timer unit TU3, the grain culm is stopped for a time corresponding to the time when it passes through the section L, and after the off time tb,
If the switch S2 is still in the off state, the transport device 12 is adjusted in the deep handling direction.

(G) Effects of the Invention As explained above, according to the present invention, the timer units TU2 and TU3 are made to change inversely to the conveying speed v of the grain culm conveying device 12, so that the grain culm conveying speed Irrespective of whether v is high or low, the tip of the grain is always detected after an inappropriate grain culm has passed through section L. Therefore, the unsuitable grain culm before adjustment is detected and the conveying device 12 is adjusted more than necessary. , it is possible to reliably prevent hunting from occurring, and the timing at which the control signal is output is approximately the same as the time when the handling depth sensor 16 detects the grain culm that has been adjusted by the previous detection. The feedback of the system is extremely good, and accurate depth control with good responsiveness can be performed.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a pre-processing section of a combine harvester to which the present invention can be applied, Fig. 2 is a schematic side view showing its handling depth control device, and Fig. 3 is a grain culm conveying speed and tires according to the present invention. FIG. 4 is a side view showing an embodiment for detecting the cutting speed, FIG. 5 is a front view thereof, and FIG. 6 is an electric circuit diagram showing an embodiment of the present invention. . 1... Combine harvester, 5... Fulcrum (axis), 6...
... Pre-processing section, 11 ... Raking device, 12 ... Grain culm conveyance device, 16 ... Handling depth sensor, 19 ... Speed change lever, TU2, TU3 ... Timer unit, tb
...Off time, v...Transportation speed, VR1, VR
2... Potentiometer (reaping speed detector),
L...Distance, M...Adjustment drive means (motor).

Claims (1)

[Scope of Claims] 1. The grain culm conveying device 12 moves with its downstream side as the fulcrum 5, adjusts the handling depth by adjusting the delivery position of the grain culms from the raking device 11, and A handling depth control device for a combine harvester 1 in which a handling depth sensor 16 is arranged so as to face a predetermined distance L downstream from the front end of a conveying device and move integrally with the grain culm conveying device. Detect the speed and calculate the detected value
VR1 and VR2 are input to timer units TU2 and TU3 which convert the continuous signal from the handling depth sensor into an intermittent signal and transmit it to the adjustment drive means M of the grain culm conveying device, and the off time tb of the timer unit is determined. ,
Conveying speed v of the grain culm conveying device linked to the reaping speed
The adjusting driving means is driven by a signal from a handling depth sensor that detects the grain culm delivered to the grain culm conveying device after being adjusted by the adjusting driving means. The configured combine harvester handling depth control device.