JPH04365418A - Controller for depth of threshing in combine - Google Patents

Abstract

PURPOSE:To rationally hold a conveyor to the lowest limit position while preventing the conveyor from dropping down due to shock, vibration, etc., during traveling. CONSTITUTION:Position alternation units 11-14 for vertical displacement of a conveyor 8 on the way of conveyance passage conveying harvested grains and culms to a thresher and a controller (H) for controlling the threshing depth of grains and culms in the thresher by controlling the position alternation units 11-14 are provided. A lowest limit sensor (LS2) for detecting the lowest position of the conveyor 8 is equipped and the controller (H) can control the above- mentioned position alternation units 11-14 so that the above-mentioned conveyor 8 may be raised by a set distance following detection of the lowest limit position.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides position changing means for vertically displacing a conveying device in a conveying path for conveying cut grain culms to a threshing device, and a method for controlling the position changing means for said threshing device. The present invention relates to a handling depth control device for a combine harvester, which is provided with a control means for controlling the handling depth of grain culms in the device.

0002

2. Description of the Related Art In such a combine harvester handling depth control device, the conveying device is configured to be held at a predetermined position by the holding force of a position changing means. For example, if the position changing means is constituted by a motor with a decelerator that includes a worm, etc., the position will be maintained if the power supply to the motor is stopped.

0003

[Problems to be Solved by the Invention] However, the above-mentioned position holding is not fixed mechanically. For example, the position is merely maintained by the frictional resistance of the decelerator, which is mainly the frictional resistance between the worm and the worm wheel. Therefore, the conveying device may fall slightly from the holding position due to shock or vibration while the combine harvester is running. especially,
The above-mentioned fall is likely to occur when a motor with a reducer with a small reduction ratio is used to reduce costs.

[0004] The motor remains stopped when the mowing operation is not in progress, or if manual adjustment of the depth control is selected even during the mowing operation. Therefore,
If the conveyance device is set to be at the lower limit position of the adjustment range, it may fall to the mechanical lower limit position due to an impact or the like. Supporting the conveyance device by mechanical contact at the lower limit position is undesirable because wear and deterioration of the contact portion due to vibration occurs. Further, when the lower limit position is detected by a mechanical contact such as a limit switch, it is disadvantageous that the contact is likely to wear out and deteriorate.

The present invention has been made in view of the above circumstances, and its object is to rationally hold the conveying device at the lower limit position in order to eliminate the above-mentioned disadvantages.

[0006]

[Means for Solving the Problems] The handling depth control device for a combine harvester of the present invention includes a position changing means for vertically displacing a conveying device in a conveying path for conveying cut grain culms to a threshing device; A control means for controlling the handling depth of the grain culm in the threshing device by controlling a position changing means is provided, and a first characteristic configuration is a lower limit detection for detecting a lower limit position of the conveying device. Means is provided, and the control means is configured to control the position changing means to raise the conveying device to a set height as the lower limit position is detected.

[0007] In a second characteristic configuration, in the first characteristic configuration, the control means controls the position changing means to raise the conveying device to a set height after a set time after the lower limit position is detected. The point is that it is structured like this.

[0008]

[Operation] According to the first characteristic configuration, when the transport device falls due to impact or vibration and the lower limit detection means detects that the transport device has reached the lower limit position, the control means activates the position changing means. Controllably raises the conveyor to a set height. Therefore, the conveying device is flexibly held between the lower limit position and a position raised by a set height from the lower limit position.

When the mowing operation is not in progress, the set height can be set to a sufficiently large value, but during the mowing operation when the handling depth control is manually adjusted and the conveyance device is set near the lower limit position, The lift of the transport device cannot be increased too much. In this case, the detection information of the lower limit position may change frequently due to vibrations or the like.

Therefore, as in the second characteristic configuration, after a set time (for example, 5 seconds) has elapsed after it is detected that the lower limit position has been reached, the position changing means is controlled to raise the conveying device to the set height. . In other words, even if frequent changes in detection information occur, the position changing means is not operated frequently.

[0011]

As the conveyance device is not fixed at the lower limit position for a long period of time, it is possible to suppress wear and deterioration caused by the conveyance device repeatedly hitting the contact portion at the lower limit position due to vibration. Furthermore, when the lower limit position is detected by a mechanical contact such as a limit switch, it is now possible to suppress wear and deterioration of the contact.

Furthermore, according to the second characteristic configuration, the position changing means is prevented from operating frequently when the detection information of the lower limit position changes frequently due to vibrations, etc., so that the durability of the movable part and energy saving are improved. But it turned out to be excellent.

[0013]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. As shown in FIG. 2, the self-removal type combine harvester of this embodiment is equipped with a reaping section B at the front of a machine body A that includes a pair of left and right crawler running devices 1, a threshing device 2, and a control section 3. . The reaping section B includes a pulling device 4 that causes a planted grain culm, a cutting blade device 5 that cuts the stock base of the raised grain culm, and an auxiliary conveyance device 6 that collects the harvested grain culms and transports them rearward. , a conveying device (which transfers the harvested grain culm that has been conveyed to the feed chain 7 of the threshing device 2 while gradually turning it sideways);
(hereinafter referred to as a vertical conveyance device) 8.

The reaping section B is pivotably mounted around a horizontal axis P, and during normal reaping work, the reaping section B is controlled to move up and down so that the reaping blade device 5 maintains a constant height with respect to the ground. Further, preferential elevation can be achieved by manually operating a reaping elevation lever 9 provided in the control section 3.

As shown in FIG. 1, the vertical conveyance device 8 includes a clamping conveyance device 8a that clamps and conveys the stock side of the harvested grain culm, and an ear locking conveyance device 8b that locks and conveys the ear side of the harvested grain culm. and,
It transports the harvested grain culm from the auxiliary transport device 6 in a vertical position toward the rear of the machine, and at the end of the transport, it changes to a horizontal position and transfers it to the feed chain 7.
It works as if it were handed over to someone else.

The terminal end of the vertical conveyance device 8 is also pivoted about the horizontal transverse axis P, and has a structure in which the tip can swing up and down with respect to the reaping section B. When the tip of the vertical conveyance device 8 is displaced up and down, the position that clamps the harvested grain culm supplied from the auxiliary conveyance device 6 moves in the culm length direction. As a result, the position of the cut grain culm transferred from the vertical conveyance device 8 to the feed chain 7 moves in the culm length direction, and the handling depth in the threshing device 2 changes. In other words, when the vertical conveyance device 8 swings downward, it is adjusted to the deep handling side, and when it swings upward, it is adjusted to the shallow handling side.

As shown in FIG.
An electric motor 11 with a speed reducer, a fan gear 12 that meshes with the pinion of the speed reducer, and a swing link 1 fixed to the fan gear 12.
3. Consists of a link 14 connected to the swinging link 13 by a pivot shaft Q and having the other end pivoted to the vertical conveyance device 8. Sector gear 12
The swing link 13 is pivotally connected to the main tube 10 of the reaping section B at the horizontal axis R.

When the electric motor 11 is rotationally driven by the control means H including a forward/reverse drive circuit for the electric motor 11,
The sector gear 12 and the swing link 13 swing around the horizontal axis R. As a result, the bending angle between the swing link 13 and the link 14 changes, and the tip of the vertical conveyance device 8 is vertically displaced with respect to the main tube 10 of the reaping section B. Note that limit switches LS1 and LS2 are provided as upper limit position detecting means and lower limit position detecting means for detecting the upper limit position and lower limit position of the vertical conveyance device 8, and their contact signals are inputted to the control means H.

Therefore, the handling depth control device is composed of the above-mentioned vertical conveyance device 8, position changing means, control means H, and the like. The control means H is equipped with a microcomputer, and automatically controls the position changing means of the vertical conveyance device 8 so that the handling depth is appropriate based on the detection information of the sensor described below.

As shown in FIGS. 1 and 2, the vertical conveyance device 8
A pair of upper and lower tip sensors S1 and S2 for detecting the tip position are attached to an inverted U-shaped member 15 fixed to the inverted U-shaped member 15. The ear sensors S1 and S2 are comprised of a sensor lever 16 that swings backward toward the lower side of conveyance upon contact with the grain culm, and a switch that turns on when the sensor lever 16 swings backward. The contact signal of the switch is input to the control means H.

[0021] The mounting positions of the ear tips sensors S1 and S2 are appropriate when the position of the ear tip of the harvested grain culm being conveyed by the vertical conveyance device 8 is between the upper ear tip sensor S1 and the lower ear tip sensor S2. It has been adjusted to be more user-friendly. Therefore, the control means H drives the electric motor 11 in the forward and reverse directions, based on the detection information of the ear sensors S1 and S2, so that the position of the ear tip of the harvested grain culm falls within the above range, and causes the vertical conveyance device 8 to swing up and down. It turns out. In addition, the limit switch LS1,
If it is detected by the detection signal of LS2 that the vertical conveyance device 8 has reached the upper limit position or the lower limit position, the electric motor 1
1 is stopped.

As shown in FIG. 1, if grain culms are supplied to the tip of the vertical conveyance device 8, the stock switch S3 is turned on.
, a threshing switch S4 that is turned on when the threshing clutch is in a connected state, and an automatic/manual changeover switch SW1 for controlling the handling depth, and these contact signals are input to the control means H. In the control means H, the stock switch S3 and the threshing switch S4 are on, and the automatic/manual changeover switch SW is turned on.
1 is set to the automatic side, automatic handling depth control is performed based on the detection information of the tip sensors S1 and S2.

Furthermore, when the automatic/manual changeover switch SW1 is set to the manual side, the up/down switch S
The vertical conveyance device 8 can be vertically swung by operating W2. That is, while the up switch is pressed, the vertical conveyance device 8 rises, and while the down switch is pressed, the vertical conveyance device 8 descends. This up/down switch SW
2 also works preferentially when it is desired to temporarily swing the vertical conveyance device 8 up and down during automatic handling depth control.

When the automatic/manual changeover switch SW1 is set to the manual side, the vertical conveyance device 8 is often set to the lower limit position, that is, to the deepest handling side. Alternatively, the vertical conveyance device 8 is often kept at the lower limit position even during movement. In this case, as described above, when it is detected from the contact signal of the limit switch LS2 that the vertical conveyance device 8 has reached the lower limit position, the drive of the electric motor 11 is stopped, and the vertical conveyance device 8 is It is held in that position by the holding force of the motor 11.

In other words, the position of the vertical conveyance device 8 is maintained by the frictional resistance of the decelerator, which is mainly the frictional resistance between the worm and the worm wheel. However, this position retention is not perfect, and the conveying device may fall slightly from the holding position due to shock or vibration while the combine harvester is running. In the handling depth control device of this embodiment, when such a natural fall occurs, the limit switch L is
To avoid mechanical damage to S2 etc.
Lower limit position control is performed to flexibly hold the vertical conveyance device 8 at the lower limit position.

That is, basically the limit switch LS2
When turned on, the electric motor 11 is driven for a predetermined time (T1) to raise the vertical conveyance device 8 to a set height. However, in order to prevent frequent repetition of turning on the limit switch LS2 and raising the vertical conveyance device 8, even if the limit switch LS2 is turned on, the set time (T2
) controls the electric motor 11 not to be driven.

The above control can be expressed in a flowchart as shown in FIG. In the figure, a timer T1 is used to control the time during which the electric motor 11 is driven so as to raise the vertical conveyance device 8 by a set height. Timer T2 is a timer corresponding to the above-mentioned set time (T2), and is set to about 5 seconds. UP is a flag. Note that the timer T1 and timer T2 are counted in the main routine.

Other examples will be listed below. ■ If the set height for raising the vertical conveyance device 8 when the limit switch LS2 is turned on is set to be sufficiently large, that is, if the predetermined time (T1) for driving the electric motor 11 is set to be long enough, the set time (T2) can be increased. Even if it is set to zero, it is possible to avoid frequent repetition of turning on the limit switch LS2 and raising the vertical conveyance device 8. That is, timer T
2 can be omitted. This is sufficient if you are moving.

■ Although the vertical conveyance device 8 of the above embodiment is of a swinging type at the tip with a fulcrum at the rear end, the present invention is not limited to this. It can also be applied to a handling depth control device using the device 8. This type of vertical conveyance device 8 changes the position of the grain culm delivered to the feed chain in the culm length direction, and the lower limit position is the shallowest handling side.

■ Lower limit detection means (and upper limit detection means)
is not limited to a limit switch; for example, a potentiometer for detecting the swing angle of the vertical conveyance device 8 is provided, and the lower limit position (and upper limit position) of the vertical conveyance device 8 is detected from the upper and lower limits of the angle. You can.

[0031] Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a combine harvester handling depth control device according to an embodiment of the present invention.

[Figure 2] Front side view of combine harvester

[Figure 3] Flowchart of lower limit position control

[Explanation of symbols]

2 Threshing device 8　　　　　　　　　　　Transfer device 11-14 Position changing means H Control means

Claims (2)

[Claims] 1. Position changing means (11 to 14) for vertically displacing a conveying device (8) on a conveying path for conveying cut grain culms to a threshing device (2); ~14) by controlling the threshing device (
2) A handling depth control device for a combine, which is provided with a control means (H) for controlling the handling depth of grain culms, and a lower limit detection means (L) for detecting the lower limit position of the conveying device (8).
S2) is provided, and the control means (H) controls the position changing means (11 to 14) to raise the conveying device (8) to a set height as the lower limit position is detected. Combine harvester handling depth control device configured in 2. The control means (H) controls the position changing means (11 to 14) to raise the conveyance device (8) to a set height after a set time after the lower limit position is detected.
2. The combine harvester handling depth control device according to claim 1, wherein the device is configured to control the depth of operation of a combine harvester.