JPS6237933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sawing depth control device installed in a combine harvester.

In a combine harvester, as the combine harvester travels, the grain culm is harvested by the reaping section and is conveyed to the threshing section installed above by the grain culm conveying device, and the grain culm is threshed by the threshing section using the threshing drum. It's getting old. However, the growth level of grain culms differs depending on the location even within the same field where reaping is carried out, so if the harvested grain culms are fed to the threshing section at the same depth, the position of the grain tip relative to the threshing barrel will vary. Threshing becomes impossible. For this reason, an automatic sawing depth control device is installed in parallel with the grain culm conveyance device, and this device is operated according to the height of the harvested grain culm to ensure that the grain culm is always fed to the threshing machine at a constant sawing depth. It is controlled so that

However, conventional automatic sawing depth control devices cannot detect the correct height of the grain tip when the grain culm is inverted or the ear tip is bent. The drawback was that it could not be controlled and could malfunction.

This invention was made to eliminate these conventional drawbacks, and its purpose is to:
To provide an automatic sawing depth control device that accurately detects the height of the ear tip in any condition of the grain culm and prevents malfunction.

In order to achieve such an object, the present invention provides an auxiliary ear tip conveying device that is inclined with respect to the grain culm conveying device so that the lugs scoop up the grain culm, and a lug on the auxiliary ear tip conveying device. A sawing depth sensor is installed at a position where it can detect the tip of the grain when the grain culm is stretched.

Hereinafter, this invention will be explained in detail based on examples.

FIG. 1 is a schematic side view of an embodiment of an automatic sawing depth control device according to the present invention. In the figure, 1
2 is a weeding rod, 2 is a weeding body provided at the tip of the weeding rod 1, and 3 is a grain culm that is guided by the weeding body 2 and raised by a lug 3a that continuously moves upward. A culm pulling device, 4 a clipper-like reaping section for reaping grain culms, 5 a traveling device, 6 a threshing section with a built-in threshing barrel, and 7 a grain supply for supplying grain culms to the threshing section 6 The chain 8 is a clamping rod for sandwiching the grain culm between the grain culm supply chain 7 and the grain culm supply chain 7. Note 9
is the harvested grain culm. Moreover, 10 is the reaping part 4
This is a grain culm conveying device for conveying the grain culm 9 harvested by the grain culm 9 to the supply port of the grain culm supply chain 7.
It consists of a root feeding chain 11 that supports the root portion of the root feeding chain 11 and a tip feeding device 12 that supports the tip portion and is disposed approximately parallel to the root feeding chain 11 at a predetermined distance above the root feeding chain 11. Pinch rods 13 and 14 are provided at the upper and lower parts of the root feed chain 11, respectively, and the root feed chain 11 and the grip rods 13 and 1
The root portion of the grain culm 9 is held between the two and conveyed. Furthermore, the ear tip feeding device 12 is provided with a lug 12a that supports the ear tip of the grain culm 9 and moves upward continuously. Further, a sawing depth adjustment chain 17 is disposed below the intermediate portion of the root feed chain 11 where the clamping rods 13 and 14 are not present, and is rotatable in the direction of the arrow around the fulcrum 16.
In addition, 18 is a clamping rod, and the sawing depth adjustment chain 1
7 and this clamping rod 18, the root of the grain culm 9 is clamped and conveyed. The saw depth adjustment chain 17 is rotated by a hydraulic cylinder (not shown). Further, above the ear tip feeding device 12, an auxiliary ear tip conveying device 20 is arranged in line at an inclination angle thereto,
It is rotatably supported around a fulcrum 21 as shown by the arrow. Note that 20a is a lug that supports the tip of the grain culm 9 and moves continuously upward. moreover,
A sawing depth sensor 24 having actuators 22 and 23 vertically spaced apart from each other is provided on the upper surface of the auxiliary tip conveying device 20. The auxiliary tip conveying device 20 can be rotated arbitrarily to adjust its height by a mechanism (not shown).

Although the grain culm conveying device 10, saw depth adjustment chain 17, and auxiliary ear tip conveying device 20 described above are shown so that the grain culm 9 is supported vertically in the figure, in reality, the tip of the grain culm 9 is tilted backward in the plane of the paper. They are arranged at an angle. This inclination allows for smooth communication with the grain culm supply chain 7 that supports the grain culm 9 horizontally.

Here, the structure of this auxiliary ear tip conveying device 20 will be explained in more detail with reference to a perspective view shown in FIG. 2. A chain (not shown) runs endlessly along the periphery of the auxiliary ear tip conveying device 20, and the base of a lug 20a made of soft plastic and having a rounded surface that contacts the grain culm 9 is attached to this chain. It is rotatably supported. A plurality of lugs 20a are arranged at equal intervals, and are arranged so that they stand up when moving on the right side of the figure in the direction of the arrow, and fall down when moving on the left side to be accommodated in the device. Note that the grain culm pulling device 3 and the ear advance device 12 also have similar structures. In addition, the actuators 22 and 23 of the sawing depth sensor 24 maintain the neutral position with elasticity, and the lug 20
It extends in almost the same direction and over the same range as a. When the actuators 22 and 23 hit the tip of the grain culm sent by the lug 20a, they are pushed and rotated, operating the sawing depth sensor 24 and controlling the hydraulic cylinder as described later in FIG. 4.

In such a configuration, when the traveling device 5 operates and the combine moves forward, the grain stalks planted in the field are guided by the weeding body 2 and enter. After this grain culm is raised by a grain culm lifting device 3, its root is harvested by a reaping section 4. The harvested grain culm 9 is passed through a root feeding chain 11 and a clamping rod 14.
The tip part is held by the tip feeding device 1.
2 and transported upward. From the position where the clamping rod 14 disappears, the grain culm 9 is conveyed further upward with its root being clamped by the sawing depth adjustment chain 17 and the clamping rod 18. In this case, if the height position of the tip is too low, both actuators 22 and 23 will not be pushed and the sawing depth sensor 24 will not be operated. In this state, the details will be described later in FIG. 4, but the hydraulic cylinder operates to rotate the threshing depth adjustment chain 17 upward and move the position of the grain culm 9 upward. As a result, the tip of the actuator 23
When this is pressed and the saw depth sensor 24 is operated, the upward rotation of the saw depth adjustment chain 17 is stopped based on this operation. This state is the normal height of the grain culm 9 during transportation, that is, the normal sawing depth. On the other hand, if the height of the tip is too high, the actuators 22 and 23 are both pushed and the sawing depth sensor 24 is activated.Based on this operation, the sawing depth adjustment chain 17 is rotated downward and the grain culm 9 Move the position downward. As a result, the tip of the saw no longer hits the actuator 22, the saw depth sensor operates, and the downward rotation of the saw depth adjustment chain 17 is stopped based on this operation. Next, the grain culm 9, whose sawing depth has been automatically adjusted in this way, is held at its root by the root feed chain 11 and the clamping rod 13, and further conveyed to the top. From here, the grain culm 9 enters the threshing section 6 with its root portion held between the grain culm supply chain 7 and the clamping rod 8.
Since the grain culm 9 is controlled so that the sawing depth is constant, the tip of the grain is placed at an accurate position with respect to the sawing barrel. In this way, good threshing work is achieved.

Next, the operation of the auxiliary tip conveying device 20 will be explained in more detail with reference to FIG. 3. Now, grain culm 9
If the tip of the ear is bent, the ear tip feeding device 1
However, in this invention, since the auxiliary tip conveying device 20 is arranged above the tip feeding device 12, the tip cannot be detected accurately.
The lug 20a raises the tip of the grain culm 9 to make it stand upright. Moreover, since the auxiliary ear conveying device 20 has an inclination angle with respect to the ear passing band A and is disposed so as to cross this, the lug 20a supports the ear tip and then moves the grain culm toward the tip. The grain moves diagonally to the direction of the grain, plows the tip of the ear, and eventually moves away from the tip. As a result, the tip of grain culm 9 is lag 20
a and stands upright, and in this state it comes into contact with the actuators 22 and 23. Therefore, the actuators 22 and 23 can always detect the tip position in the correct upright posture even if the tip of the grain culm 9 is bent. In addition, FIG. 3 shows that the actuator 23 is in the position where it is pushed by the ear tip and rotated in the direction of the arrow, the actuator 22 is not pushed and is in the neutral position, and the sawing depth of the grain culm 9 is in the normal state. It shows. Note that the sawing depth of the grain culm 9 can be arbitrarily adjusted by rotating the auxiliary ear tip conveying device 20 up and down and changing the positions of the actuators 22 and 23 (sawing depth sensor 24).

FIG. 4 is a hydraulic circuit diagram of a hydraulic cylinder that vertically rotates the sawing depth adjustment chain 17 shown in FIG. In the figure, oil discharged from a pump 30 passes through a filter 31 and a check valve 32, and then is supplied to an inlet/outlet a of a hydraulic cylinder 33 and a solenoid valve 34, respectively. Also,
The oil passing through the solenoid valve 34 is supplied to the inlet/outlet b of the hydraulic cylinder 33 and the solenoid valve 35, respectively. Note that 36 is a tank, 37 is a piston of the hydraulic cylinder 33, S ₁ is a solenoid of the electromagnetic valve 34, and S ₂ is a solenoid of the electromagnetic valve 35.

In such a configuration, when the actuators 22, 23 shown in FIGS. 1 to 3 are in the neutral position, the sawing depth sensor 24 is inactive;
At this time, current is supplied to solenoid _S2 . In this way, when the solenoid S ₂ is energized, the solenoid valve 35 opens, so the inlet/outlet b is connected to the tank 36 and the piston 37 of the hydraulic cylinder 33 is connected.
is moved in the direction of the solid arrow by oil pressure from the pump 30. This movement of the piston 37 causes the first
The saw depth adjustment chain 17 shown in the figure pivots upwards. As a result, when the grain culm moves to the deeper rowing depth, the grain tip eventually reaches the actuator 23.
When the saw depth sensor 24 is pressed, the saw depth sensor 24 enters the first operating state. In this first operating state, the current flowing through the solenoid _S2 is cut off. Therefore, in this first operation, the electromagnetic valve 35 closes, so that the movement of the piston 37 is stopped and its position is maintained. Next, when a long grain culm comes in and the tip hits the actuator 22 and pushes it, the sawing depth sensor 24 enters the second operating state. In this second operating state, current is supplied to the solenoid _S1 . In this way, when the solenoid S ₁ is energized, the solenoid valve 34
opens, so ports a and b are short-circuited. Since the load of the lifted sawing depth adjustment chain 17 is applied to the piston 37, this load causes the oil to exit from the inlet/outlet a and enter the inlet/outlet b, causing the piston 37 to move in the direction of the dotted arrow, and at the same time adjust the sawing depth. Chain 17 also rotates downward. As a result, when the grain stalk moves toward a shallower sawing depth, the grain tip eventually separates from the actuator 22 and the sawing depth sensor 24 returns to the first operating state. By repeating this operation, the sawing depth of the grain culm is automatically controlled to be constant.

In addition, since the lugs of the auxiliary ear tip conveying device scoop the tips of grain culms, it is preferable that the lugs have a round shape or be made of an elastic material so as not to shed the ears.

As described above, according to the automatic sawing depth control device of the present invention, the tip can be detected with the grain culm stretched out by the lug, so even if the tip of the grain culm is bent, the tip of the grain can be detected. Since the position can always be detected accurately, it has the effect of preventing malfunctions, improving the performance of automatic sawing depth control, and stabilizing work.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an embodiment of an automatic sawing depth control device according to the present invention, FIG. 2 is a perspective view of an auxiliary tip conveying device, and FIG. 3 is a diagram for explaining the operation of the auxiliary tip conveying device. The side view, FIG. 4, is a hydraulic circuit diagram of the hydraulic cylinder. 4... Reaping section, 6... Threshing section, 9... Grain culm, 1
0... Grain culm transport device, 17... Saw depth adjustment chain, 20... Auxiliary ear tip transport device, 20a... Lug, 21... Fulcrum, 22, 23... Actuator, 24... Saw depth sensor.

Claims (1)

[Claims] 1. In an automatic sawing depth control device that controls the sawing depth of the grain culm supplied to the threshing unit when the grain culm harvested in the reaping unit is supplied to the threshing unit by the grain culm conveying device, an endless sawing depth control device is provided. an auxiliary ear tip conveying device having a lug that moves toward the grain culm, the lug being arranged at an angle so as to move away from the grain culm conveying device according to the moving direction of the grain culm so as to scoop the grain culm; and a sawing depth sensor provided on the auxiliary ear tip conveying device so as to detect the ear tip in a state where the grain culm is stretched by the lug.