JPS6124924Y2 - - Google Patents

Description

[Detailed description of the invention] Recent combine harvesters have improved performance and can thresh even grain culms that are somewhat wet. However, there is a limit to this, and if the moisture content is too high, grains and grains will adhere to and accumulate on the No. 2 transfer spiral, No. 2 receiving trough, and grain lifting section, resulting in a heavy load on their drive. The rotational speed of the shaft decreases, the sorting and transfer performance deteriorates, and in severe cases, it becomes clogged and cannot rotate, and it is extremely difficult to remove this clog.

In order to eliminate such defects, the moisture content of grain culms is measured in the handling room, and when the moisture content exceeds a certain level, an alarm is issued.This alarm causes the operator to reduce the running speed or interrupt the work. However, once the wet material enters the threshing device, it will adhere to the receiving net, the second transfer spiral, the grain lifting cylinder, etc. and cause clogging, so it is impossible to improve the above-mentioned drawbacks. I couldn't do it.

The present invention measures the moisture content of the grain culm before feeding it to the threshing device, and makes it possible to judge in advance whether to continue the harvesting and threshing operation or to interrupt it. The purpose is to prevent clogging of the grain lifting section, and a stalk conveying device is provided in the grain moving path in front of the threshing device.
A pair of electrodes for measuring the capacitance of the grain culm is provided in a part adjacent to the stalk conveying device, and an output is sent to the circuit between the electrode and the operating section when the moisture content of the grain culm is above a standard. This is characterized by the insertion of a judgment circuit.

The embodiment shown in the drawings will be explained below.1
is a self-thresholding type threshing device mounted on one side of the combine machine platform, and in front of it is a 2-sewing structure.
..., a reaping device 3 consisting of a grain culm comb (not shown), etc.
is provided, and the harvested grain culms are raked by a stalk conveying device composed of a guide frame 4, a raking belt with lugs, and a raking chain 6 with protrusions arranged oppositely to form a grain culm transfer path. From there, the grain is transferred to the handling depth adjuster 7 provided in the subsequent grain transfer path and supplied to the threshing device 1.

On the upper surface of the guide frame 4, as shown in FIG.
Holding body 1 made of an insulator such as Eponite through
0 so as to be movable forward and backward, and the lug 5
On the case 5a of the attached scraping band, the other electrode 11 facing the electrode 8 is provided with a holder 12 made of an insulator.
It is installed by

The one electrode 8 is connected to one input terminal A of the monostable multivibrator 14 shown in FIG.
3 to the other input terminal B, and a square wave oscillator 15 is connected to the monostable multivibrator 14.

Furthermore, a differential amplifier 18 inserted into a circuit leading from the monostable multivibrator 14 to operating parts such as a buzzer 16 and an alarm lamp 17 is connected to the monostable multivibrator 14 via a smoothing circuit 19.
On the other hand, the output of the reference setter 20 is input.

When the grain culm transported by the stalk transporting device approaches the stalk transporting device and passes between the pair of electrodes 8 and 11, it is held between the grains as shown in FIG. However, since the grains are transported in a well-coiled state, electrodes 8 and 11 are connected depending on the moisture content of the grains.
By accurately measuring the capacitance formed by the above, the output pulse width of the monostable multivibrator 14, that is, the input voltage e2 of the differential amplifier 18 changes.

At that time, when the moisture content of the grain culm is low enough to not interfere with the threshing process, the input voltage e2 from the differential amplifier 18 is higher than the constant input voltage e1 from the reference setter 20.
is small and the output voltage of the differential amplifier 18 is e0 > 0, and if the water content of the grain culm is large and the threshing section is clogged if the operation is continued, then e1 < e2, e0 < 0. If the output voltage e1 of the reference setting device 20 is set, if the material is wet and e1<e2, the transistor 21 and relay 22 will be turned on, the buzzer 16 will sound, and the alarm lamp 17 will be lit. take appropriate measures, such as suspending harvesting and threshing operations.

Next, another embodiment will be described with reference to FIGS. 4 to 6. Reference numeral 25 is a winnowing part of the sorting section of the threshing device 1;
A fixed split pulley 27a and a movable split pulley 27b are attached to the shaft 26, and the movable split pulley 27b is biased by a spring 28 in the direction of narrowing the width of the pulley groove.
A cam surface 29 is provided on the boss 7b, and a V-belt 30 with a tight pulley attached to the intermediate portion is stretched between the variable speed pulley 27 consisting of the fixed pulley 27a and the driving pulley.

Reference numeral 31 is a solenoid provided at a portion facing the cam surface 29, and when it is energized, a push rod 32 projects against a spring 33.
Since its tip presses the cam surface 29, the movable split pulley 27b moves in the direction of widening the V-groove as shown in FIG.
1 is demagnetized, it returns to the state shown in FIG. 5 and reaches a predetermined rotation speed.

As shown in FIG. 4, the solenoid 31 is arranged in parallel with the alarm lamp 17 to form an operating body, so that it is energized when grain culms containing moisture above the standard value are stirred into the solenoid 31. Therefore, removing straw debris that tends to adhere to the grain will also help dry the grains, thereby preventing clogging.

As mentioned above, the present invention provides a stalk conveying device in the grain culm moving path ahead of the threshing device, and a pair of electrodes for measuring the capacitance of the grain culm in a region adjacent to the stalk conveying device. A judgment circuit is inserted into the circuit between this electrode and the actuating part, which outputs an output when the moisture content of the grain culm is above the standard, so that if the grain culm is wet and unsuitable for threshing, the grain culm It is detected that the grain culm contains more than a predetermined amount of moisture before being fed to the threshing device, and an actuating part can be actuated thereby to thresh the wet grain culm and transfer it to the second transfer spiral or It is possible to prevent the grain lifting cylinder from becoming clogged and becoming unable to thresh.

Furthermore, since the pair of electrodes for measuring the capacitance is provided in a location close to the stalk conveying device provided on the grain culm movement path, the distance between the pair of electrodes can be minimized. Unlike the case where the measurement position is on the ear side, the sensing accuracy does not deteriorate, and it is possible to always measure accurately, and it is possible to prevent the ear part from colliding with the electrode and falling off.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a plan view of the combine harvester, Figure 2 is a front view of the main parts, Figure 3 is a circuit diagram, Figure 4 is a circuit diagram of another embodiment, Figures 5 and 6 are the transmission section of the Karakino. FIG. 4... Guide frame, 5... Lug, 8, 11... Electrode, 9... Bullet, 12... Holder, 13... Seed wire, 14... Monostable multivibrator, 16
... Buzzer, 17 ... Alarm lamp, 18 ... Differential amplifier, 20 ... Reference setter, 31 ... Solenoid.

Claims (1)

[Scope of utility model registration request] A stalk conveying device is provided in the grain culm moving path in front of the threshing device, a pair of electrodes for measuring the capacitance of the grain culm is provided in a region adjacent to the stalk conveying device, and this electrode and the actuating section are connected. A grain culm moisture detection device for a combine harvester, characterized in that a determination circuit is inserted in the circuit between the two, which outputs an output when the moisture content of the grain culm is higher than a standard.