JPS6026607Y2 - Dust sensor in threshing machine - Google Patents

Description

[Detailed description of the invention] In conventional threshing machines, especially those in which the properties and amount of husks to be threshed vary, such as the threshing device of a combine harvester, when there are many items to be handled, the top of the sorting net in the first sorting section, etc. As a result, the flow of the sorting air becomes poor, and the leakage of grains becomes worse, and the straw waste removal performance decreases, and the dust sorting equipment consisting of a straw rack, chaff sieve, spoke, etc. that separates the second grains becomes During this period, a large amount of mixture of dust and grains migrates, and the grains are either ejected from the dust outlet at the rear of the aircraft as dust particles, or are sucked into the suction fan and become dust particles. Ta.

In addition, even if the amount of grain in the shaken material is normal, if a large amount of straw waste is generated, such as when threshing a collapsed culm, the grains that have entered the thick layer of straw will be sufficiently separated. Since it could not be recovered, the third scattering occurred as described above.

It has been found that such scattering is approximately proportional to the amount of dust particles.

Therefore, as a method to improve the above-mentioned drawbacks, it is possible to detect the amount of dust and adjust the rotation speed or running speed of the blower fan according to the detected amount to change the air selection performance, or to change the air selection performance. It is possible to adjust the amount, but if the sensor is placed above the dust sorting device to detect the amount of dust, straw debris will get caught on the sensor or get tangled and accumulate, resulting in false detection and This results in other drawbacks such as damage to the sensor.

The present invention aims to provide a dust sensor for a threshing machine that accurately detects the amount of dust and does not interfere with dust sorting. The present invention is characterized in that an exhaust dust sorting device is installed, and a detection sensor having a receding angle is projected upward from below the exhaust dust sorting device.

The embodiment shown in the drawings will be described below. Reference numeral 1 denotes a self-described threshing device mounted on a combine harvester base 3 having a traveling device 2, and in front of which a culm pulling body 4 and a cutting blade 5 are mounted.
A reaping device consisting of the above, and a handling depth adjusting body 6 for conveying and supplying the cut husk to the threshing device 1 are provided.

Reference numeral 7 denotes a handling barrel that is mounted on a shaft in the handling chamber 8, and is installed so that a swinging sorting body 11 swings back and forth from below the receiving net 9 to the dust exhaust port 10. These are the transport sorting plate 12 facing the lower surface of the receiving net 9, the sorting net 14 extending to the end thereof and facing above the first receiving gutter 13a, and the separating screen 14 extending on the lower side thereof and facing above the second receiving gutter 13b. Strollack 15 facing the
The stroke rack 15 can be replaced with a chaff sheave or a large number of parallel spokes.

Further, a suction fan 17 is provided on the upper side of the dust sorting chamber 16, and a second thrower 18 is provided at the transfer end of the second receiving gutter 13b for returning the second material onto the transfer and sorting plate 12. It is.

Directly below the stroke rack 15, there is provided a support shaft 19 whose both ends are pivoted to both side walls, and a sensing sensor 20, 20 protruding from the middle of this support shaft 19 faces diagonally rearward and upward. The arm 21, which has a receding angle and whose tip portion protrudes into the stroke rack 15, and which is protruded from one end of the support shaft 19, is arranged so that the sensing sensor 20, 20 maintains a predetermined backward tilt sensing posture. A cam 23, which is pulled forward by a spring 22 and fixed to the other end, is in contact with a sensing switch 25 inserted into the electrical circuit of the buzzer 24.

The harvested husk is then threshed by the handling drum 7, and the grains and small straw waste in the shaken matter that is generated leaks from the receiving net 9 onto the transfer sorting plate 12 and is transferred, where it is removed from long straw and ears. Broken receiving net 9
The particles that have not leaked out are discharged from the dust inlet 26 onto the grains, etc., and are passed through the screening net 14 to the pressure fan 2.
The grains are sorted through a sieve while being screened by the sorting wind from 7, and the grains fall into the first receiving trough 13a and are carried out of the machine by a transfer screw.

In addition, straw waste, ear fragments, and small amounts of grain remaining on the sorting net 14 are transferred to the straw rack 15 and subjected to a shaking sorting process, and second-class items such as grains and ear fragments are transferred to the second rack. A person falls into the gutter 13b, and light straw debris is discharged by the suction fan 17, and large straw debris is discharged from the dust outlet 10 to the outside of the machine.

At this time, the detection sensor 20.20 rotates downward against the spring 22 as the dust gets on top of it, and if the amount of dust is larger than the appropriate amount, the cam 23 closes the detection switch 25, and the buzzer 24 sounds an alarm. emits.

Therefore, the operator increases the rotation speed of the blower fan 27 to promote the removal of straw H, and if the buzzer 21 continues to issue a warning, take measures such as slowing down the traveling speed and reducing the amount of culm supplied. When this is done, the amount of dust is appropriate, the dust sorting performance returns to its standard state, and it is possible to prevent grains from being scattered.

In addition, when wet culm is threshed, the specific gravity of the waste is high, so a relatively small amount will cause a warning, and the straw waste etc. will adhere to the straw rack 15, form a lump, and be difficult to separate. Despite this, good sorting can be performed.

Since the present invention is configured as described above, the dust transferred on the dust sorting device rides on the detection sensor, but since the detection sensor has a receding angle, it can easily and smoothly climb over it, and the straw waste is removed. It is possible to always perform proper sensing without causing erroneous sensing due to particles getting caught or entangled with the sensing sensor and accumulating.

Moreover, since straw waste and the like do not accumulate as described above, the transfer and sorting of waste materials can be carried out accurately at all times, regardless of the amount of the waste materials or whether they are wet or dry.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view of a combine harvester, Fig. 2 is a sectional view of a threshing device, and Fig. 3 is a sectional view of a threshing device.
The figure is a sectional view of a main part, and FIG. 4 is a perspective view of the same. 11... Oscillating sorting body, 14... Sorting net, 15... Stroke rack, 20...
Detection sensor, 22...Spring, 23...
...Cam, 24...Buzzer 25...
...Sensing switch.

Claims (1)

[Scope of utility model registration request] A threshing device characterized in that a dust sorting device such as a stroke rack, a chaff sieve or a spoke is installed in the dust sorting section, and a detection sensor having a receding angle projects from the bottom to the top of the dust sorting device. Dust sensor in the machine.