JPH0119640Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a handling depth control device for a combine harvester, and more particularly to a handling depth control device capable of switching between shallow handling control and deep handling control.

In general, the handling depth control device senses the grain culm tip and controls the handling depth adjustment device that clamps the grain culm in the shallow handling direction or deep handling direction, but in the case of lodging materials, etc. , the culm tip has not grown, so it is difficult to treat it too closely. Therefore, at least three sensor arms are provided to detect the tip of the grain culm being transported, and predetermined two of these sensor arms are activated so that the tip is located between the two sensor arms. The dead zone based on this can be switched between shallow handling and deep handling, and the handling depth can be switched between deep handling control and shallow handling control depending on the erected state of the grain culm, that is, whether it is upright wood or lodging wood. A handling depth control device has been proposed, but since this handling depth control device is controlled at a constant speed and torque even in shallow handling control or deep handling control, in deep handling control, the grain culm is Despite this, the control speed is too slow, overloading the threshing machine and causing unhandled grain, and shallow handling control disturbs the grain culm.
The control speed was too fast, causing hunting.

Conventionally, as shown in Japanese Utility Model Application Laid-open No. 52-22034, the speed of the handling depth adjustment device has been conventionally adjusted so that the speed of movement toward the shallow handling side is higher than the speed of movement toward the deep handling side. A device that prevents overload from being applied to the threshing section, and a device that prevents overload from being applied to the threshing section.
As shown in Publication No. 90834, the control speed of the handling depth adjustment device is changed in proportion to its operating amount, and overload,
The speed control devices of these handling depth adjustment devices are those that change the speed depending on the moving direction or the amount of operation of the handling depth adjustment device. It does not change between shallow handling control and deep handling control, but there is a big difference in the premise.

Therefore, the present invention is a handling depth control device that can always perform appropriate control, whether during deep handling control when the grain culm is in a smooth state or during shallow handling control when the grain culm is in a disturbed state. The purpose is to provide the following.

Further, the present invention changes the speed of the driving body of the handling depth adjustment device during shallow handling control and deep handling control,
The present invention is characterized in that the control speed during shallow handling control is slow and the control speed during deep handling control is fast.

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

As shown in FIG. 1, the combine 1 has a large number of dividers 2... and cutting blades 3 at the front of the machine body, and behind them a raking device 5..., a lateral conveyance device 6, and a handling depth adjustment device 7. is installed. In addition, a main sensor 9 for detecting the grain culm and a handling depth sensor 10 for detecting the grain tip are arranged in the handling depth adjustment device 7, and the handling depth sensor 10 has three sensor arms 10a and 10b. ,1
0c, and arm 1 is used for shallow handling control.
0a and 10b are arm 1 for deep handling control.
0b and 10c are used. Further, a thresher 13 consisting of a handling barrel 11 and a feed chain 12 is installed on one side of the machine, and the grain culm is delivered from the handling depth adjustment device 7 to the feed chain 12 at a predetermined handling depth. The grain is threshed by the handling cylinder 11.

A switch 9' is operated by the main sensor 9, and switches 10a', 10b', 10 are operated by each arm of the handling depth sensor 10.
c' are connected as shown in FIG. In addition,
In the figure, 15 is a change-over switch for switching between shallow handling contact a and shallow handling contact b, 16 is a main switch, 17 is a timer unit, and 19 is a pilot lamp. Furthermore, R1 is a relay, with a contacts R1a, R1b, R1c, R1d and b contacts R1e, R1f, R1g, R1h and R
1i is switched and controlled. In addition, R2 and R3 are relays, and the b contacts R2a, R2b and R3 are respectively
Control by changing a and R3b. Furthermore, T1 and T2 are timers with time-limited operation a contacts T1a and T2, respectively.
1b, T2a, and T2b. Also, 20
21 is a lower limit stop switch, and 21 is an upper limit stop switch. 22 is a handling depth adjustment device 7
This is a handling depth control motor that drives and operates the
a, 20b and an armature 20c.

Since the present embodiment has the above-described configuration, when the grain culm is a lodging material and the culm is conveyed to the handling depth adjustment device 7 in a tangled state and is in a disordered state, the handling depth sensor 10 detects that the grain tip is Since contact does not occur reliably, the changeover switch 15 is switched to and held at contact a for shallow handling. In this state, relay R1 is not energized and each contact is in the position shown in FIG.
is in the on state and the arm 10 of the sensor 10
The handling depth is controlled by a and 10b. That is, when the grain culm tip is between arms 10a and 10b and only switch 10a' is on, relay R2 is energized to turn off b contacts R2a and R2b, and motor 2
2 is stopped. From this state, when the tip also contacts the arm 10b and turns on the switch 10b', the timer T1 is activated and after a predetermined delay time,
That is, after cutting off the disturbance signal caused by only a small number of grain culms, the a contacts T1a and T1b are turned on to turn on the motor 22.
Rotate in the forward direction. At this time, the field coil 20b is also energized in addition to the field coil 20a by the b contact R1i, and therefore the compound DC motor 22 is rotated at low speed and high torque. As a result, the handling depth adjustment device 7 handles the disturbed, wet and heavy grain culm at low speed and with strong force in the shallow handling direction until the tip of the grain separates from the arm 10b and the switch 10b' is turned off. Moving. In addition, the tip of the arm 10a
When both switches 10a' and 10b' are turned off, the current to relay R2 is cut off, and b
Contacts R2a and R2b are turned on to rotate the motor 22 in the opposite direction. As a result, the handling depth adjustment device 7
However, it similarly moves at low speed and with strong force in the deep handling direction until the tip contacts the arm 10a and the switch 10a' is turned on.

On the other hand, the grain culm is the upright material, and the handling depth adjustment device 7
When the objects are arranged in a straight line and transported in a flat state, the changeover switch 15 is switched to and held at contact b for shallow handling. In this state, the relay R1 is energized and the a contacts R1a, R1b, R1c, R1
d is in the on state, arm 10 of sensor 10
The handling depth is controlled by b and 10c. That is, the tip is between arms 10b and 10c, and switch 1
When only 0b' is on, relay R3 is energized to turn off b contacts R3a and R3b, and motor 22 is stopped. From this state, the tip is arm 10.
When the switch 10c' is turned on by contacting the contact point C, the timer T2 is activated, and after a predetermined delay time, the a contacts T2a and T2b are turned on and the motor 22 is rotated in the forward direction. At this time, the b contact R1i is in the OFF state, so only the field coil 20a is energized, and the compound DC motor 22 is rotated at twice the high speed. As a result, the handling depth adjusting device 7 moves quickly in the shallow handling direction at high speed until the tip of the head separates from the arm 10c and the switch 10c' is turned off. Also, when the tip of the ear separates from the arm 10b and both switches 10b' and 10c' are turned off, the relay R
3 is cut off, B contacts R3a and R3b are turned on, and the motor 22 is rotated in the opposite direction. As a result, the handling depth adjusting device 7 similarly quickly moves at high speed in the deep handling direction until the tip contacts the arm 10b and the switch 10b' is turned on.

In addition, the position of each sensor arm of the handling depth sensor 10 is arranged such that the distance between the arms 10a and 10b is relatively short and the distance between the arms 10b and 10c is relatively long, so that shallow handling is possible in accordance with the control speed. It is desirable that the width of the dead zone is narrow during the over-reaching control, and the width of the dead zone is wide during the deep-reaching control. Further, in the above-described embodiment, the shallow handling/deep handling switching switch 15 was operated manually, but it goes without saying that it may be switched automatically by sensing the lodging material.

As explained above, according to the present invention, the speed of the driving body of the handling depth adjustment device is changed between shallow handling control and deep handling control, and the control speed during shallow handling control is slowed down. Therefore, even though the grain culms are being conveyed in disorder during shallow handling control, hunting etc. can be prevented and stable handling depth control can be performed. It is used for fallen timber, but fallen timber is often wet and heavy, and even the heavy and disturbed grain culms can be moved with strong force based on high torque to reliably control the handling depth. I can do it. Furthermore, since the control speed during deep handling control is increased, it is possible to respond quickly, and it is possible to prevent overloading of the threshing machine due to deep handling and occurrence of unhandled grain due to shallow handling. Further, if the driving body of the handling depth adjustment device is a compound-wound DC motor, the speed can be changed simply and easily.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing a combine harvester to which the present invention is applied, and FIG. 2 is an electrical circuit diagram according to an embodiment of the present invention. 1... Combine harvester, 7... Handling depth adjustment device, 1
0... Handling depth sensor, 10a, 10b... Sensor arm for shallow handling, 10b, 10c... Sensor arm for deep handling, 13... Threshing machine, 15... Changeover switch, 22... Drive body, (compound DC motor), a...Contact for shallow handling, b...Contact for deep handling.

Claims (1)

[Claims for Utility Model Registration] 1. At least three devices for detecting the tip of the grain culm being transported.
A sensor arm is provided, and a dead zone position based on the position of the tip between two predetermined arms among these arms is configured to be switchable for shallow handling control and deep handling control, In a handling depth control device that adjusts a handling depth adjustment device so that the tip of the ear is located in the switched dead zone for shallow handling control or deep handling control, the handling depth adjustment device is adjusted. The driving body to be driven is configured to change its control speed so that it is slow during shallow handling control based on the shallow handling control dead zone and becomes fast during deep handling control based on the deep handling control dead zone. depth control device. 2. The working depth control device according to claim 1, wherein the driving body of the working depth adjusting device is a multi-turn DC motor.