JPH04365419A - Controller for depth of threshing in combine - Google Patents

Abstract

PURPOSE:To prevent abrasion or deterioration observed when mechanically held at the lowest position by holding a conveyor at the upper limit position in a flexible state when cutting work is hot carried out. CONSTITUTION:When operation sensors (S3) and (S4) for detecting whether cutting work is carried out or not are in an off state (when cutting work is not carried out), the conveyor 8 is held at the upper limit position by driving an electric motor 11 using a controller (H). When the limit switch (LS1) is disconnected by dropping of the conveyor, the electric motor is driven. When the limit switch is connected, the electric motor is stopped.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a position changing means for vertically displacing a conveyance device on a conveyance path for conveying cut grain culms to a threshing device, and a means for detecting whether or not a reaping operation is in progress. A handling depth control device for a combine harvester, comprising a work detection means and a control means for controlling the handling depth of the grain culm in the threshing device by controlling the position changing means during the reaping work based on the detected information. Regarding.

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] When the mowing operation is not in progress, the motor remains stopped. 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 above problem is particularly likely to occur when the vehicle is running at high speeds because of the large vibrations.

[0005] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to rationally hold the conveying device in order to solve the above-mentioned problems.

[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, and a work detecting means for detecting whether or not work is in progress; and a control means for controlling the handling depth of the grain culm in the threshing device by controlling the position changing means during the reaping work based on the detected information. The first characteristic configuration is that upper limit detection means for detecting an upper limit position of the conveying device is provided, and the control means detects that the work detection means is not in the middle of a reaping operation. The present invention is configured to control the position changing means to maintain the conveyance device at the upper limit position based on the detection information of the upper limit detection means while the transport device is in the upper limit position.

[0007] In a second characteristic configuration, in the first characteristic configuration, vehicle speed detection means for detecting the vehicle speed is provided, and based on the detection information, the control means controls the conveyance device when the vehicle speed is higher than a set value. The present invention is configured to control the position changing means to maintain the position at the upper limit position.

[0008]

[Operation] According to the first characteristic configuration, when the mowing operation is not in progress, the control means moves the conveyance device to the upper limit position, and controls the position changing means to maintain the conveyance device at the upper limit position based on the detection information of the upper limit detection means. Control. For example, if the upper limit position detected by the upper limit detection means has a certain width, if the transport device falls and deviates from the upper limit position, the position change means is activated to move the transport device to a set height corresponding to the detection width of the upper limit position. only to rise. Therefore, the conveyance device is flexibly held within the detection width of this upper limit position.

According to the second characteristic configuration, the control means maintains the above-mentioned conveyance device at the upper limit position only when the mowing operation is not in progress and the vehicle speed is higher than the set value. conduct. When the machine is running at low speed, such as when the mowing operation is temporarily stopped at the end of mowing on a headland, etc., and the mowing operation is moved to the next mowing start point, the above control is not performed and the position of the transport device is not adjusted during the mowing operation. This is because there are cases where it is preferable to hold the position at .

0010

Effects of the Invention: When not in the cutting operation and when traveling at high speed, the conveying device is flexibly held at the upper limit position, so it does not come into contact with vibrations as it would if it were held mechanically at the lower limit position. This prevents wear and deterioration of parts. Therefore, it has excellent durability and is also easy to deal with cost reduction of the position changing means.

[0011]

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 horizontal axis P, and the tip end 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.

The position changing means for vertically displacing the tip end of the vertical conveying device 8 with respect to the reaping section B is 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.

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 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 not driven up and down, but is held in that position by the holding force of the electric motor 11 with a speed reducer. 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 from the holding position due to shock or vibration while the combine harvester is running.

If such a natural fall occurs and the conveying device 8 is left to fall to the lower limit position, mechanical damage may be caused to the limit switch LS2 etc. due to vibration. Therefore, in the handling depth control device of this embodiment, upper limit position control is performed to flexibly hold the vertical conveyance device 8 at the upper limit position under predetermined conditions.

[0024] The predetermined condition is that the cutting operation is not in progress;
This is also the case when the vehicle is traveling at high speed. As work detection means for detecting whether or not the reaping work is in progress, a stock head switch S3 and a threshing switch S4 are used. In other words, the control means H determines that the mowing operation is not in progress when both switches S3 and S4 are off.

A vehicle speed sensor (S5) serving as vehicle speed detection means for detecting vehicle speed is provided in the transmission (not shown) of the crawler traveling device 1, and its detection signal is input to the control means H. The control means H determines that the vehicle is traveling at high speed when the vehicle speed obtained from the detection signal is greater than a set value (for example, 1 m/s).

If the above two conditions are met, the control means H drives the electric motor 11 to raise the conveying device 8. When the limit switch LS1 that detects the upper limit position of the transport device 8 is turned on, the electric motor 11 is stopped,
The transport device 8 is held at the upper limit position. However, as described above, in order to flexibly hold the vertical conveyance device 8 at the upper limit position while recovering from natural fall due to shock and vibration, the following control is performed.

Basically, when the vertical conveyance device 8 falls and the limit switch LS1 turns off, the electric motor 11 is activated for a predetermined time (T1) to raise the vertical conveyance device 8 to the set height.
) to drive. There is a slight hysteresis between the position where limit switch LS1 is turned off and the position where limit switch LS1 is turned on, and there is also a slight margin between the position where limit switch LS1 is turned on and the mechanical upper limit position. has been established.

Therefore, by controlling as described above, the vertical conveyance device 8 is flexibly held between the position where the limit switch LS1 is turned off and the position where the set height is raised from there. . The above control can be expressed as a flowchart as shown in FIG. 3. In the figure, timer T1
is used to control the driving time of the electric motor 11 to raise the vertical conveyance device 8 by a set height,
Counting is done in the main routine.

Other examples will be listed below. (2) As the work detecting means for detecting whether or not the reaping work is in progress, only one of the stock head switch S3 and the threshing switch S4 may be used. Alternatively, a reaping switch that is turned on when the reaping clutch is engaged may be used. Alternatively, the upper limit position control may be performed only on the condition that the vehicle is traveling at high speed, regardless of whether the vehicle is mowing, or conversely, the condition may be set only on the condition that the vehicle is mowing, regardless of the vehicle speed. Good too.

■ Although the vertical conveyance device 8 of the above embodiment is of a type in which the rear end is pivotally supported and the front end swings, the present invention is not limited to this. It can also be applied to a handling depth control device using a type of vertical conveyance device 8 that swings. 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.

■ Upper limit detection means (and lower limit detection means)
is not limited to a limit switch, but may also include, for example, a potentiometer that detects the swing angle of the vertical conveyance device 8, and is configured to detect the upper limit position (and lower limit position) of the vertical conveyance device 8 from the upper and lower limits of the angle. You can.

[0032]Although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by such entry.

[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 upper limit position control

[Explanation of symbols]

2 Threshing device 8　　　　　　　　　　　Transfer device 11-14 Position changing means H Control means LS1 Upper limit detection means S3, S4 Work detection means S5 Vehicle speed detection means

Claims (2)

[Claims] 1. Position changing means (11 to 14) for vertically displacing a conveyance device (8) in a conveyance path for conveying cut grain culms to a threshing device (2), The handling of grain culms in the threshing device (2) is controlled by a work detecting means (S3, S4) for detecting whether or not the grain is being harvested, and by controlling the position changing means (11 to 14) during the reaping work based on the detection information. Control means (H
) is provided with a handling depth control device for a combine harvester,
Upper limit detection means (LS1) for detecting the upper limit position of the conveyance device (8) is provided, and the control means (H) detects that the work detection means (S3, S4) is not in the middle of a reaping operation. The handling of the combine is configured to control the position changing means (11 to 14) to maintain the conveyance device (8) at the upper limit position based on the detection information of the upper limit detection means (LS1). Depth control device. [Claim 2] Vehicle speed detection means (S5) for detecting vehicle speed
is provided, and the control means (H
), when the vehicle speed is greater than the set value, the transport device (8
) to maintain the position changing means (11 to 1) at the upper limit position.
4) The combine harvester handling depth control device according to claim 1, which is configured to control.