JPH0530406B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of threshing by holding the stock side of the harvested grain culm and transporting it in a substantially standing position, and switching from the substantially standing position to the sideways position of the ear side. A conveyance device for feeding the plant into the apparatus is provided, and a pair of contact type sensors for detecting the presence or absence of the tip are arranged at a point on the tip side at the starting end of the sideways conveyance path so as to act from outside the conveyance path along the culm direction. Regarding the sensor structure of a certain combine harvester.

[Conventional technology]

In a combine harvester, in order to maintain threshing efficiency, so-called handling depth control is performed so that the grain-bearing part of the harvested grain culm is fed to the optimal position of the threshing device. This handling depth control is carried out based on the signal from a sensor that detects the position of the grain tip installed in the conveying device that feeds the harvested grain culm to the threshing device, as described above. An example of a structure using a contact type sensor is disclosed in Japanese Patent Application Laid-Open No. 53-92222 (the disclosed structure has three sensors), and since each sensor has the same specifications, each Generally, the backward stroke of the contact-type sensing portion of the sensor is the same.

[Problem that the invention seeks to solve]

At the starting end of the sideways conveyance path where the conveyance path changes from a standing posture to a sideways posture, the grain tip side is swung around when the posture is changed, and the grain culm is turned outward by centrifugal force. Therefore, if a limit switch type sensor is placed at this position, even if the amount of grain culms is small, the grain culms will be pressed against the sensor by this centrifugal force, and the presence of the ears can be accurately detected.
The closer to the tip of the grain culm, the greater the centrifugal force and the greater the degree of bending. Therefore, in the conventional structure, as shown in FIG. 6, the sensing part 1 of the sensor on the tip side of the tip
For 0a, the tip of the grain culm is pressed more strongly than the sensing part 11a of the other sensors,
There were cases where the so-called straining phenomenon occurred during transport, causing grain shedding.

Here, the present invention focuses on the above-mentioned problem and aims to prevent accidental shedding of grain when the grain culm comes into contact with a sensor.

[Means for solving problems]

The feature of the present invention is that, in the sensor structure of the combine harvester mentioned above, the backward stroke of the sensing part of the sensor on the tip side of the tip is set larger than the backward stroke of the sensing parts of other sensors, and its effect. And the effects are as follows.

[Effect]

With the above configuration, when the grain culm comes into contact with the sensing parts 10a and 11a of both sensors as shown in FIG. The sensing portions 10a and 11a of both sensors are pressed approximately equally with a relatively weak force, and the force with which the grain culm is pressed against the sensing portion 10a of the sensor on the tip side is smaller than in the past.

〔Effect of the invention〕

As described above, by minimizing the occurrence of situations where the sensing part of one sensor is pressed with an extremely large force, the occurrence of straining phenomena in the sensor part is reduced, and as a result, this The amount of grain being shed at certain points has been reduced, and the efficiency of grain recovery in the combine has improved.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 7, a threshing device 2 is mounted on a machine body equipped with a crawler traveling device 1, and a reaping device consisting of a clipper-type reaping device 3, a pulling device 4, a conveying device 5, etc. is mounted on the front of the machine body. A combine harvester includes a pre-processing section.

As shown in FIGS. 3, 4, and 7, the conveying device 5 includes a clamping and conveying device 6 that clamps and guides the stock base of the harvested grain culm.
and a locking and conveying device 7 that locks and guides the middle of the reaped grain culm, and the whole is driven to swing around the horizontal axis _P1 of the reaping pretreatment section. The clamping conveyance device 6 is composed of a conveyance chain 6a with projections and a guide rail 6b biased toward the conveyance chain 6a, and the locking conveyance device 7 is constituted of a conveyance arm 7a and a fixed guide rail 7b. has been done.

The clamping and conveying device 6 extends in a substantially straight line from the reaping device 3 side to the starting end of the feed chain 8, whereas the locking conveyor device 7 extends just before the feed chain 8 with a path approximately at right angles. The direction is changed to the inside of the body, and in this part, the harvested grain culm, which has been conveyed in a substantially standing position, is handed over to the feed chain 8 in a sideways position while being swung around. Then, the support rod 9, which has an inverted U-shape when viewed from the front, to which both the guide rails 6b and 7b are attached, is extended upward from the inside of both the transport devices 6 and 7, and the position is switched to the above-mentioned sideways posture. It extends downward through the.

A pair of limit switch type sensors 10 and 11 for detecting the position of the ear tip of the harvested grain culm are connected to the support rod 9.
A guide member 1 is installed at a location where the harvested grain culm switches to a sideways posture, and guides the harvested grain culm between the two sensors 10, 11 and the locking and conveying device 7.
2 is placed. And this guide member 1
As shown in FIGS. 3 and 4, a portion 12a corresponding to the position where the reaped grain culm switches to a sideways posture on the terminal end side of the grain culm 2 is deviated outward. As a result, the reaped grain culm is moved outward, that is, toward the sensors 10 and 11 by the centrifugal force when the harvested grain culm changes to the sideways posture.

As shown in FIGS. 1 and 2, the sensors 10 and 11 have sensing portions 10a and 11a that are swingable about vertical axes P ₂ and P ₃ and are located within the conveyance path of the harvested grain culm. The entire sensor 10, 11 is a support part 1
The sensors 10 and 11 are connected to the support rod 9 through the links 10 and 14 so as to be able to swing and change their positions around the horizontal axes P ₄ and P ₅ . , 11 is configured so that the positions of both sensors 10 and 11 can be changed in the vertical direction of the conveyance path without disturbing the positional relationship between the sensors 10 and 11.

As shown in FIG. 1 and FIG.
The sensing portion 11a is installed across both the sensors 10 and 11 through the rear of the sensing portion 11a, and the backward stroke limit of the sensing portion 11a is determined by its contact with the link 15. On the other hand, the backward stroke limit of the sensing portion 10a of the sensor 10 on the tip side of the tip is as shown in the figure.
It is determined by the contact with the curved part of the support rod 9 that supports the tip, and its backward stroke is set to be larger than the backward stroke of the sensing section 11a on the side of the tip stock base.

The handling depth control is based on the signals from the sensors 10 and 11, so that the tip of the harvested grain culm is located between the two sensors 10 and 11, and the conveying device 5 is moved to the horizontal axis P ₁ of the pre-harvesting processing section. This is done by swinging it around.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the sensor structure of a combine harvester according to the present invention, FIG. 1 is a plan view of the vicinity of the sensor, FIG. 2 is a front view of the vicinity of the sensor, FIG. 3 is a plan view of the conveying device, and FIG. 4 is a plan view of the vicinity of the sensor. FIG. 5 is a longitudinal sectional front view of the conveying device in the vicinity where the grain culm switches to the sideways posture, FIG. 5 is a diagram showing the contact state of the grain culm to the sensor in the present invention, and FIG. 6 is a diagram showing the contact state of the grain culm to the sensor in the conventional structure. FIG. 7, which shows the contact state, is a side view of the front half of the combine harvester. 2... Threshing device, 5... Conveying device, 10, 11
...Sensor, 10a, 11a...Sensor sensing part.

Claims (1)

[Claims] 1. It is equipped with a conveying device 5 that grips and conveys the harvested grain culm in a substantially standing position, switches the head side from the approximately standing position to a horizontally fallen position, and sends it to the threshing device 2, and also includes a transport device 5 that transports the harvested grain culm in a substantially standing position, and feeds it to the threshing device 2. In the sensor structure of the combine, a pair of contact type sensors 10 and 11 for detecting the presence or absence of the ear tip are arranged along the culm direction so as to act from the outside of the conveyance path. Sensor 1 on the side
A sensor structure of a combine harvester in which the backward stroke of the sensing section 10a of the sensor 10 is set larger than the backward stroke of the sensing section 11a of the other sensors 11.