JPH0153009B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the structure of an automatic handling depth adjustment device for a combine harvester.

[Problems to be solved by conventional technology and invention]

Conventionally, as an automatic handling depth adjustment device in a combine harvester, a grain culm conveying device that can change the relative position of the grain culm to the starting end of the feed chain in the threshing section is installed in the grain culm conveying path that sends the harvested grain culm to the threshing section. , a detector for sensing the tip of the grain culm is disposed in the grain culm conveying path, and the detector and the grain culm conveying device are connected to each other by sensing the tip of the grain culm by the detector. As disclosed in the prior art Japanese Unexamined Utility Model Publication No. 147133/1983, in associating it so that it is displaced in the direction of shallow handling or deep handling,
Typically, three detectors were arranged at appropriate intervals in the longitudinal direction of the grain culm in the grain culm transport path.

In other words, one of the detectors on both the left and right sides of the central detector detects the shallow handling position, and the other detector detects the deep handling position, and the grain culms are conveyed. 3 above, regardless of the
When no grain culm is detected by any of the detectors, it is determined that the grain is being treated completely lightly.

When the grain culm tip is not detected by the deep handling detector and the central detector, and the grain culm tip is detected by the shallow handling detector, the grain culm conveying device is moved so as not to move the grain culm any further in the shallow handling direction. Move in the direction of deep treatment.

If the grain culm tip is detected by both the shallow handling detector and the central detector, it is determined that the target handling depth is reached, and the grain culm conveying device moves in either direction for shallow handling or deep handling. do not.

When the tip of the grain culm is detected by all three detectors, it is determined that the grain culm is being handled deeply, and the grain culm conveying device is normally controlled to move in the direction of shallow handling.

In this way, since three detectors are required, the cost is high, and space for installing the three detectors must be secured in the grain culm conveyance route, and the location where the detectors are installed is limited. subject to restrictions.

Furthermore, even at the normal target handling depth, the grain culm must come into contact with two detectors, which increases the resistance force due to the large number of contact points between the detector and the grain culm. There was also a problem that the posture of the grain culm was easily disturbed.

The present invention aims to solve these problems.

[Means to solve the problem]

In order to achieve this object, the present invention provides a grain culm conveying device that is capable of changing the relative position of the threshing section with respect to the starting end of the feed chain in the grain culm conveying path for transporting the harvested grain culm to the threshing section. A detector for sensing the tip of the grain culm is disposed in the grain culm conveyance path, and the detector and the grain culm conveying device are connected to each other. Or, in relation to displacement in the deep handling direction, a position where the tip of the grain is appropriately distant from the detector in the deep handling direction is set as a target handling depth position, and the grain culm conveying device is adjusted as appropriate. The grain culm conveying device is controlled to be forcibly moved from the target handling depth position in the shallow handling direction at each time interval, and when the detector detects that the grain tip has deviated in the shallow handling direction, the grain culm conveying device is controlled. The structure is such that the control is performed to return to the target handling depth position.

〔Example〕

Next, an embodiment of the present invention will be described.
A grain culm cutting body 6, a grain culm lifting device 7, a stock cutting device 8, a grain culm stock transportation device 9, etc. are provided in front of the threshing section 4 which has a built-in handling barrel 5. A self-propelled, self-removal type combine harvester equipped with a reaping pre-treatment section 10 is shown.

The grain culm harvested in the pre-harvesting treatment section 10 is conveyed toward the starting end of the feed chain 3 while the grain base is held by the grain culm conveying device 9, and the grain culm is supplied into the handling chamber of the threshing section 4. It is configured to be supplied from the port 11.

The grain culm conveying device 9 is configured to be swingable so that its terminal end can move in the left-right direction with respect to the starting end of the feed chain 3, and by this rocking operation, the grain culm tip feeding device, that is, the handling chamber, is moved. The depth can be adjusted.

Reference numeral 12 denotes a detection unit fixedly disposed in front of the grain culm supply port 11, and the detector 12 detects the grain culm tip in the grain culm transport path of the grain culm transport device 9, etc. As a result, the detector 12 and the grain culm transport device 9 are associated with each other so as to displace the grain culm transport device 9 in the shallow handling or deep handling direction via the control circuit 13 and drive means described later.

The grain culm conveying device 9 is driven by the movement of a piston rod 15 of a double-acting actuator 14 attached thereto, and the actuator 14 is operated by a solenoid attached to an electromagnetically operated three-way switching valve 17 in a hydraulic circuit 16. The drive is controlled by 18 and 19.

That is, when the shallow handling solenoid 18 is turned on, hydraulic pressure is sent to the circuit 20, the piston rod 15 is projected, and the grain culm conveying device 9 is moved at a constant speed in the shallow handling direction, and on the contrary, the deep handling solenoid 19 is turned on. Then, send hydraulic pressure to circuit 21 and move piston rod 1.
5 is moved backward, and the grain culm conveying device 9 is moved at a constant speed in the deep handling direction.

Note that reference numerals 22 and 23 are limit switches as safety devices, and when the shallow handling limit switch 23 is activated, the energization to the shallow handling solenoid 18 is turned off so that the piston rod 15 does not move further in the shallow handling direction, and the shallow handling limit switch 23 is activated. When the limit switch 22 is activated, the energization to the deep handling solenoid 19 is turned off so that the piston rod 15 does not move any further in the deep handling direction.

The control circuit 13 shown in FIG.
The target handling depth is set when the grain is located one step away from the grain, and the tip part is not moved in the shallower handling direction than the set position of the detector 12, thereby preventing unhandled grains in the threshing section. It is.

That is, the reference numeral 24 is the main switch for operating the control circuit 13, and the reference numeral 25 is the ON switch if there is a grain culm in the grain culm conveyance route.
A culm detection switch 26 is an NO (normally open) contact that is turned ON when the detector 12 detects the tip, and 27 is an NC (normally closed) contact that is turned OFF when the detector 12 detects the tip.
It is a point of contact. The NC contact 27 and the deep handling solenoid 19 are connected in series, while the shallow handling solenoid 18, the setting timer T1 and the sampling timer T2 are connected in parallel to each other, and the
It is connected in series behind the NO contact 26. The contact 18 that becomes normally closed when the setting timer T1 turns on is connected in series between the NO contact 26 and the deep handling solenoid 19, and the contact 29 that becomes normally open when the sampling timer T2 turns on connects with the NO contact 26. Shallow handling solenoid 1
It is connected in series with 8.

Further, the initial timer T0 commands deep handling when the grain culm is being conveyed by the grain culm conveying device 9 in a pinched manner at the start of reaping, but the tip of the grain is not detected by the detector 12, which is a so-called shallow handling state. The contact 30, which is provided for the purpose of operation and is normally open during the operating time t0 of the initial timer T0, is the contact 28.
and the NO contact 26, and the operating time is
The contact 31 which is normally closed during t0 is connected in parallel to the contact 29.

Furthermore, the operating time t1 of each of the timers T1 and T2,
t2 is set so that t1 < t2, for example by setting t1 = 1 second and t2 = 10 seconds, but the setting timer T1 is configured to be variable so that time t1 can be varied within that range. Similarly, the operating time t2 of the sampling timer T2 may be changed.

The handling depth control with this configuration will be explained from the start of reaping, for example, according to the operation time chart of each element shown in FIG. , the culm detection switch 25
It becomes ON.

In a so-called shallow handling state where the tip of the grain culm being transported is not detected by the detector 12, the initial timer T
0 is activated for time t0 (contact 30 is ON), while NC contact 27 is ON and deep handling solenoid 19 is activated.
Turn ON and displace the grain culm conveying device 9 in the deep handling direction until the tip of the grain is detected by the detector 12 (~
section).

When the tip of the ear is detected by the detector 12, the NC contact 2
7 becomes OFF, and similarly NO contact 26 becomes OFF.
Turns ON (point). As a result, timers T1 and T
2 operates at the same time, sending only time t1 and contact 28
Since it is turned ON, the deep handling solenoid 19 continues to operate during that time t1 (~section). this
Due to the movement in the deep handling direction at time t1, the tip part moves away from the detector 12 by a distance l1 in the deep handling direction, and the target handling depth position can now be set (
point). In this state, the contact 29 of the timer T2 is OFF, so there is no displacement of the grain culm conveying device 9, and (t2-
t1) Maintain this state for time (~ interval).
After this, when the operation of timer T2 ends, contact 29
is turned ON (point), and the shallow handling solenoid 18 is operated to forcibly displace the grain culm conveying device 9 in the shallow handling direction (~section).

When the tip comes off the detector 12, the NO contact 26
is turned off, timers T1 and T2 are reset, and at the same time, the NC contact 27 is turned on to activate the deep handling solenoid 19 (point), and when the tip is detected by the detector 12 again, the NO contact is turned on.
Turn on, activate timers T1 and T2 (point),
Thereafter, the same operations ``~'' as described above are repeated.

After maintaining the displacement at the target depth position for (t2 - t1) in this way, the detector 12 placed near the shallow handling position is made to sense that the tip part is coming off in the shallow handling direction. By repeating the process of forcibly moving the grain culm and then returning it to the deep handling direction for a period of time (t1), it is possible to correct the deviation between the distance between the tip of the grain culm being transported and the detector and the target handling depth position. On the other hand, if short culms are mixed into the transported grain culms, the grain culm conveying device can be immediately moved in the deep handling direction to prevent unhandled grains from being left in the threshing section.

The detector 12 may be of a non-contact type that senses by blocking light or reflecting light using a phototube or the like, instead of a contact type that senses when the tip comes into contact with the tip.

In addition, by arranging the detector in a position where it can sense the tip of the grain near the end of the conveyance path in the grain culm conveyance device, the time required to detect the length of the grain culm and change the relative position to the starting end of the feed chain can be improved. It is possible to minimize the target delay, eliminate the response delay in control, and perform control with extremely high precision.

Furthermore, by providing a variable setting timer T1 that can adjust the length of the setting time so that the target handling depth position can be variably set in the control circuit, the target handling depth can be arbitrarily set while the detector arrangement is fixed. It becomes extremely easy to do so.

[Action/effect of the invention]

As described above, according to the configuration of the present invention, the grain culm conveying device that can change the relative position with respect to the feed chain start end in the threshing section is associated with the detector disposed in the grain culm conveying path. The target handling depth position is set at a position where the tip of the grain culm is appropriately separated in the deep handling direction, and the grain culm conveying device is moved shallowly from the target handling depth position at appropriate time intervals. Since the grain culm is controlled to be forcibly moved in the direction, the tip of the grain can be sensed by the detector and the deviation of the tip of the grain culm being conveyed from the target handling depth position can be corrected.

When the detector detects that the grain tip has come off in the shallow handling direction, the grain culm transport device is controlled to return to the target handling depth position, and the grain culm transport device is controlled to return to the target handling depth position. If short culms are mixed in, the grain culm conveying device can be immediately returned to the handling direction (to the target handling depth position), so no unhandled grain is left in the threshing section, and all grain culm tips can be threshed. .

According to the present invention, the detector operates to regulate the shallowest handling position, while the normal handling depth is at a position where the tip part is appropriately away from the detector in the deep handling direction. Since the control is performed to reach the so-called target handling depth position, stable control is possible by arranging only one detector, and the conventional method requires two or more detectors for stable control. In the invention, the number can be reduced to one.

Therefore, the present invention has the effect that the layout of the grain culm sensing section can be made simple and compact, and the number of contact points between the detector and the grain culm is reduced, so that the resistance force can be reduced and the grain culm being transported can be easily and compactly laid out. This has the effect that the posture of the grain is less likely to be disturbed, and the threshing action in the threshing section can be carried out smoothly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a combine harvester, FIG. 2 is a control system diagram, FIG. 3 is a control circuit diagram, and FIG. 4 is a chart of operation times of each part in the control circuit. 1... Combine harvester, 3... Feed chain, 4
... Threshing section, 9 ... Grain culm conveyance device, 12 ... Detector, 13 ... Control circuit, 18 ... Shallow handling solenoid, 19 ... Deep handling solenoid, T0, T1, T
2...Timer.

Claims (1)

[Claims] 1. A grain culm transport device that can change the relative position of the threshing part with respect to the starting end of the feed chain is provided in the grain culm transport path that sends the harvested grain culm to the threshing part, while a grain culm A detector for sensing the tip of the grain is disposed, and the detector and the grain culm conveying device are arranged such that the grain culm conveying device is displaced in a shallow handling direction or a deep handling direction by sensing the grain culm tip by the detector. In a related aspect, the target handling depth position is set at a position where the tip of the grain is appropriately distant from the detector in the deep handling direction, and the grain culm conveying device is set to the target handling depth at appropriate time intervals. While the grain culm conveying device is controlled to be forcibly moved from the grain handling depth position in the shallow handling direction, if the detector detects that the grain tip has come off in the shallow handling direction, the grain culm conveying device is returned to the target handling depth position. An automatic handling depth adjustment device for a combine harvester, characterized in that the handling depth is controlled by: