JPS5835046B2 - Grain filling sensing device in combine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grain filling sensing device in a combine harvester.

In a combine harvester, the threshed grains are sent upward by a grain-lifting spiral conveyor, then switched to one of the three grain outlets at the upper end and flowed down, where they are packed into bags.

To explain this regarding a conventional device with reference to drawings,
In FIG. 1, reference numeral 1 denotes a grain frying spiral conveyor for transporting grains in one direction, and two grain outlet hoppers 3.4, which are switched by a switching plate 2, are provided at the upper end of the conveyor, and two grain outlet hoppers 3 and 4 are provided at the upper end. A pair of grain discharge pipes 5 and 6 are vertically provided in communication with the low hopper, and a bag 7 is installed at the lower end of the pipe to accommodate the falling grains.

A sensor S is provided inside the grain discharge tubes 5 and 6, which is pushed and activated by the packed grains when the bag is filled with grains, and when the sensor is activated, the switching plate 2 is activated. Then, the grains are dropped from the other grain outlet and filled into the other bag, during which time the filled bag is removed and the empty bag is replaced.

In such conventional devices, falling grains directly hit the sensor, causing the sensor to malfunction before filling is completed, and the bag may be switched without being sufficiently filled with grains.

It is an object of the present invention to provide a device that is free from such malfunctions and can perform accurate detection operations.

In accordance with this object, the device according to the invention is a device for dropping threshed grain through a drain and filling bags, in which an opening is provided in the middle of the grain drain, and the opening is provided with an opening in the middle of the grain drain. A sensing membrane is provided at a position retracted from the inner wall guide surface of the cylinder at an appropriate distance, and a filling sensing sensor that is activated by external force displacement of the sensing membrane due to accumulated grains is provided outside the sensing membrane, thereby making it possible to detect grains. It is characterized in that when it passes through the discharge tube, it is less likely to directly hit the sensing membrane.

Hereinafter, the present invention will be described in detail with reference to the drawings.
As shown in Fig. 2 and Fig. 2, an opening 8 is provided in the outer wall in the middle of the grain discharge tubes 5, 6, and a case 9 is provided protruding from the outside of the opening 8, and a limit switch 10 as a detection sensor is installed in the opening 8. It is being

A sensing membrane 11 made of synthetic resin is stretched over the opening 8 at a position retracted at a suitable distance H from the inner wall guide surface of the grain ejector to close the opening. It is provided so as to be in contact with the actuating piece 12.

With such a configuration, the falling grains are detected by the sensing membrane 11.
The limit switch 10 is not easily pressed and will not malfunction.

When the bag is filled with a predetermined amount of grain, the upper end of the grain pile reaches the sensing membrane 11 and pushes it outward, causing the limit switch 1 to be activated.
0 is activated, the switching plate 2 is rotated by the operation of an actuator (not shown), the grain outlet is switched, and the grains are dropped into the other discharge pipe.

Furthermore, since the sensing membrane 11 is located at a position set back from the inner wall guide surface of the grain ejector, the cross-sectional area of the passage is large, so that the rising speed of grain accumulation decreases in that area, and it is possible to reliably sense when a predetermined amount has been reached. The limit switch 10 can be actuated by deflecting the membrane 11.

In another embodiment of the present invention shown in FIG. 3, a sensing device 13 having the same structure as in the previous embodiment is provided on the inner wall of the grain discharge tube 5.6, and the structure and operation are the same as in the previous embodiment. The same is true.

Furthermore, when the sensing device is provided on the inner wall along the inside of the inclined grain outlet hoppers 3, 4, falling grains are less likely to directly hit the limit switch, and malfunctions are further reduced.

Therefore, in such a case, the sensing membrane 11 may not be provided, and the eaves 14 may be provided to prevent the grains from directly hitting the switch.

As is clear from the above description, according to the present invention, the sensing membrane that activates the sensing sensor is provided at an appropriate distance away from the inner wall guide surface of the grain ejector, so that the falling grains can be directly This reduces the amount of contact with the sensing membrane and prevents the sensor from malfunctioning.

In addition, since the passage cross-sectional area at the location where the sensing membrane is installed is larger than the cross-sectional area of the discharge tube, the amount of grain deposited when the sensing membrane senses increases, and the sensing pressure increases accordingly, which inhibits the sensing operation of the switch. This can be done more reliably and stably.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the present invention, FIG. 2 is a sectional view showing essential parts, and FIG. 3 is a side view showing another embodiment of the invention. 1... Spiral conveyor, 2... Switching plate, 3, 4...
・Grain outlet hopper, 5, 6...Grain discharge pipe, 7...
Bag, 8... Opening, 9... Case, 10... Limit switch, 11... Sensing membrane, 12... Actuation piece, 1
3...Sensing device, 14...Eaves.

Claims (1)

[Claims] 1. In a device that drops threshed grains through a discharge tube and fills them into bags, an opening is provided in the middle of the grain discharge tube, and the opening is provided at an appropriate distance from the inner wall guide surface of the grain discharge tube. A grain filling sensing device for a combine harvester, comprising a sensing membrane provided at a separated and retracted position, and a filling sensing sensor actuated by outward displacement of the sensing membrane due to accumulated grains on the outside of the sensing membrane.