JPH032486B2 - - Google Patents

Description

Detailed Description of the Invention This invention is a grain culm handling depth detection device in a combine harvester, specifically a grain culm handling depth detection device equipped with a limit switch for detecting grain culms and a limit switch for detecting long and short culms. Regarding.

In a normal combine harvester, a vertical conveying device between a reaping device and a threshing device is swingably provided, and the vertical conveying device conveys and supplies the grain culm harvested by the reaping device to the threshing device. , a limit switch for detecting grain culm supply and a limit switch for detecting long and short culms are provided near the grain culm insertion port of the threshing device, and a control circuit is formed which operates according to the detection signals of these limit switches, and the control circuit A circuit swings the conveying device toward and away from the feed chain of the threshing device, and accordingly changes and adjusts the delivery position of the grain culms conveyed by the conveying device with respect to the feed chain, thereby threshing. The depth at which the grain culm is handled by the device is automatically adjusted.

When the control circuit controls the swinging of the vertical conveyance device, the limit switch for detecting grain culm supply detects the passage of the grain culm, and the control circuit is opened or closed based on the detection signal. A detection signal from the long and short culm detection limit switch is used to control the swinging of the conveying device.

By the way, in the field, the grain culms are planted with a certain distance between the plants, so the grain culms cut by the reaping device are not continuously supplied to the threshing device but intermittently. When a supplied grain culm is detected by the limit switch for grain culm supply detection, a time detection delay inevitably occurs between the detected grain culm and the next grain culm, resulting in a so-called non-detection state of grain culm supply. As a result, the limit switch will operate intermittently. Therefore, even if the limit switch for detecting long and short culms detects the length of grain culms,
Without outputting the detection signal, until the limit switch for detecting grain culm supply detects the grain culm, the grain culm is threshed in a lightly or deeply treated state, and proper threshing of the grain culm is impaired. Furthermore, since the control circuit always performs on/off operations, there are problems such as poor durability of the control circuit. Particularly during harvesting and threshing operations at low speeds of the combine harvester, the intermittent supply of grain culms is noticeable, and the control circuit turns on and off violently.

The purpose of the present invention is to prevent the harmful effects caused by the intermittent supply of grain culms due to the above-mentioned distance between plants, and to start and stop automatic adjustment of handling depth as sensitively as possible in response to the presence or absence of grain culm supply. That is.

The present invention will be explained below based on embodiments shown in the drawings.

In the figure, 1 is a combine harvester machine, which is equipped with a traveling device 2 at the bottom, supports a reaping device 3 at the front, and
A threshing device 4 is mounted on the upper part, and a vertical conveying device 5 is swingably supported between the reaping device 3 and the threshing device 4, and the grain culm harvested by the reaping device 3 is The grain is delivered to the feed chain 41 provided in the threshing device 4 by the vertical conveyance device 5, and passed through the grain culm insertion port 42 of the threshing device 4 to the handling chamber 43 by the chain 41, and during this passage, the tip of the grain culm is The grains are threshed by a handling cylinder 44 in a handling chamber 43.

Further, the vertical conveyance device 5 moves the feed chain 41 by a swinging mechanism such as a motor or a hydraulic device.
Can be adjusted to swing in the direction of approaching or away from the object,
By adjusting the swing of the vertical conveyance device 5, the grain culm delivery position from the vertical conveyance device 5 to the feed chain 41 can be changed, so that the insertion depth of the grain culm into the handling chamber 43, the so-called handling depth, can be adjusted. I have to.

And the grain culm insertion port 42 in the threshing device 4
A first limit switch LS ₁ for detecting grain culm supply, a second limit switch LS 2 for detecting long culms, and a third limit switch LS ₂ for detecting short culms are installed in parallel near the .
LS ₃ and the supply detection limit switch
When LS ₁ is turned on, the vertical conveying device is activated by a detection signal from the grain culm handling depth detection device 6, which adjusts the handling depth using the long/short culm detection limit switches LS ₂ and LS ₃ . The handling depth of grain culms can be automatically adjusted by swinging the grain culm.

Therefore, the control circuit of the detection device 6 is configured as shown in FIG. 3, namely, the normally open contact LS ₃ -a of the third limit switch LS ₃ and the normally open contact LS ₂ of the second limit switch LS ₂ . -a and
a first connection circuit A connected to a first electromagnetic relay _R1 that operates the swinging mechanism of the vertical conveyance device 5 in one direction;
and the normally closed contact of the third limit switch _LS3.
LS ₃ -b and a second connection circuit B to which a second electromagnetic relay R ₂ for operating the swinging mechanism in the other direction is connected are connected in parallel, and both circuits A and B are connected via an operating switch SW _1. A branch circuit C is formed between both circuits A and B and the switch SW ₁ , and a normally open contact LS ₁ -a of the first limit switch LS ₁ of this branch circuit C is connected to the power supply E. and an off-delay circuit D, and the normally open contact of the first limit switch _LS1 is connected by the off-delay circuit D.
To delay the off signal by LS ₁ -a,
In other words, when the normally open contact _LS1 -a opens, the electromagnetic switch _SW2 incorporated in the off-delay circuit D
Instead of immediately stopping the energization to both connection circuits A and B, the capacitor _C0 built into this off-delay circuit D causes the switch to
The configuration is such that the opening of SW ₂ is delayed in time and both of the connection circuits A and B are maintained in an operable state until a certain period of time has elapsed after the normally open contact LS ₁ -a is opened.

Specifically, when the grain culm supplied to the threshing device 4 comes into contact with the first limit switch _LS1 , its normally open contact _LS1 -a is closed, and the electromagnetic switch _SW2 of the off-delay circuit D is closed. When the threshing device 4 handles the grain culm too deeply, the third limit switch is activated.
When contacting the second limit switch LS ₂ together with LS ₃ , the normally closed contact LS ₃ -b of the second connection circuit B is opened and the circuit B is opened, while each of these switches LS ₃ and LS ₂ is normally open. The contacts LS ₃ -a and LS ₂ -a are closed to close the first connection circuit A, and the first relay R ₁ causes the vertical conveyance device 5 to be swung away from the feed chain 41 of the threshing device 4. Let it move,
Adjust the handling depth to the appropriate position so that the handling depth is shallow, and if the handling depth of the grain culm is too shallow and the tip cannot reach the third limit switch _LS3 , each of the first circuits A is normally open. The contacts LS ₃ -a and LS ₂ -a are opened to open the circuit A, and the normally closed contact LS ₃ -b of the second circuit B is closed to close the circuit B, and the second relay is closed. R ₂ swings the vertical conveying device 5 in a direction approaching the feed chain 41 to adjust the grain culm tip to the appropriate position so as to increase the handling depth. In the case of proper handling depth where the contact does not contact the third limit switch LS ₂ but contacts the third limit switch LS ₃ , the normally open contact LS ₂ -a of the first circuit A is opened and the second circuit B By opening the normally closed contact LS ₃ -b, both circuits A and B are opened and threshing is carried out in the proper state.

In addition, each of the limit switches LS ₁ , LS ₂ , LS ₃
Normally, there is a time delay between the grain culm being detected by the grain culm and the next grain culm, and in this case, the first limit switch LS ₁ is normally opened immediately after passing the detected grain culm. The contact LS ₁ -a is opened, and the above-mentioned off-delay circuit D is provided on the output side of this normally open contact LS ₁ -a, and the circuit D
By delaying the off signal from the normally open contact LS ₁ -a, that is, by delaying the off signal for a certain period of time, the next grain culm is allowed to reach the limit switch LS ₁ within this certain period of time, and the switch is activated.
This is to close the normally closed contact LS ₁ -a of LS ₁ to prevent the first and second connection circuits A and B from repeating the on/off operation following the limit switch LS ₁ .

The present invention is configured as described above, and when the grain culm conveyed to the threshing device 4 by the vertical conveyance device 5 passes the first limit switch LS ₁ , the switch LS ₁ detects the passage of the grain culm. , the normally open contact LS ₁ -a of the control circuit in FIG. If the second and third limit switches LS ₂ ,
The first circuit A is activated by the activation of LS ₃ ,
The vertical conveyance device 5 is the feed chain 41 of the threshing device 4
When the handling depth is too shallow, the second circuit B is activated and the conveyance device 5 is moved away from the feed chain 41. When the handling depth is appropriate, both circuits A and B are not activated and the threshing continues as is. is carried out.

Further, when automatically adjusting the handling depth as described above, if there is a time delay between the grain culm detected by each limit switch LS ₁ , LS ₂ , LS ₃ and the next grain culm, the first grain culm in the control circuit limit switch
The normally open contact LS ₁ -a of LS ₁ is opened simultaneously with the passage of the detected grain culm. An off-delay circuit D is provided on the output side of the normally open contact LS ₁ -a, and the circuit Since the off signal is delayed for a certain period of time by LS ₁ -a, the next grain culm reaches the limit switch LS ₁ within this delay time and closes its normally open contact LS ₁ -a. Both circuits A and B do not repeatedly turn on and off, and threshing can always be performed at an appropriate handling depth based on the output signals from both circuits A and B. This prevents electromagnetic relays R ₁ , R ₂ , etc. from chattering.

Since the present invention is configured as described above, it has the following effects.

When the limit switch for detecting grain culm supply is turned on at the start of reaping work, the handling depth can be automatically adjusted immediately.

Since a time delay corresponding to the distance between plants is applied only to the off signal output from the sensor for detecting grain culm supply, adverse effects caused by intermittent supply of grain culms can be prevented.

Further, if the grain culm is not supplied for a period longer than the time corresponding to the distance between plants, the automatic adjustment of the handling depth is immediately stopped, and unnecessary adjustment of the handling depth is not performed.

In this way, even with a configuration in which only a time delay corresponding to the distance between plants is applied to the off signal of the output of the limit switch for detecting grain culm supply, it is possible to prevent the harmful effects caused by intermittent supply of grain culms and to detect whether or not grain culms are being supplied. It is now possible to start and stop automatic adjustment of the handling depth as sensitively as possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a combine harvester implementing the handling depth detection device of the present invention, FIG. 2 is an enlarged sectional view of the main parts thereof, and FIG. 3 is a control circuit diagram. LS ₁ ... Limit switch for detecting grain culm supply,
LS ₂ ……Long culm detection limit switch, LS ₃ ……
Limit switch for short culm detection, D... Off-delay circuit.

Claims (1)

[Claims] 1. A vertical conveyance device is provided so as to be swing-adjustable, and a limit switch for detecting grain culm supply, a limit switch for detecting long and short culms, and a limit switch for detecting long and short culms are arranged on the downstream side in the conveyance direction from the vertical conveyance device and near the grain culm insertion port,
In the grain culm handling depth detection device, the handling depth is adjusted by the long/short culm detection limit switch based on the ON operation of the grain culm supply detection limit switch, the output side of the grain culm supply detection limit switch. 1. A device for detecting the handling depth of grain culms in a combine harvester, characterized in that an off-delay circuit is interposed in the switch, so that only an off signal from the switch is provided with a time delay corresponding to the inter-plant distance.