JPH026Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a single steering sensor to determine whether the aircraft is moving in the appropriate direction during automatic steering, and changes and corrects the quality of the signal depending on the degree of proximity to the planted grain culm. The purpose is to stabilize automatic steering by increasing or decreasing the amount.

That is, in this type of automatic steering sensor, a star foil-shaped sensor is rotatable, a part of which protrudes from both sides of the grass divider in plan view, and the sensor is rotated clockwise and counterclockwise to connect two switch contacts. A device in which a left steering signal and a right steering signal are generated by selectively opening and closing the steering wheel is known.
In the known device, the pulse width changes depending on the increase or decrease in the contact time between the sensor and the planted grain culm, but in the present invention, the width of the pulse changes when the row deviation is small compared to the pulse width when the row deviation is not small. The purpose of this is to further increase the pulse width and increase the amount of correction when .

In the present invention, the detection protrusion of the detection body is made of an elastic material so that it can be bent clockwise and counterclockwise, and the first switch contacts the detection protrusion when the detection body rotates clockwise, and A second switch that comes into contact with the detection protrusion during rotation is provided, and the contact time is gradually reduced by curving the detection protrusion when the detection protrusion comes into contact with the planted grain culm and with the operating pieces of both switches. It is something that increases.

The present invention will be described below based on embodiments shown in the drawings.

A weeding body 3 is fixed to the front end of a reaping frame 1 of a combine harvester or the like via a support 2. The detection body 6 is rotatably supported by the shaft.

The detection body 6 has a detection protrusion 8 made of an elastic material (soft rubber, slightly soft synthetic resin) bonded to the circumferential surface of a disc part (disc or pulley) 7 made of a metal product, hard rubber, or hard synthetic resin product. Or a ring 8 having detection protrusions 8 protruding radially from its circumferential surface.
The multi-stage detection protrusion 8, which is formed by adhering a to the circumferential surface of the disc part 7 and projecting in the radial direction, is integrated with the disc part 7. Note that even if the disk portion 7 and the detection protrusion 8 are made of the same material, only the detection protrusion 8 can be appropriately elastically deformed by appropriately selecting the thickness, width, etc. of the detection protrusion 8. As shown in FIG. 2, the portions 8L and 8R of the above-mentioned detection projections 8 protrude from the left and right side surfaces of the grass divider 3 in plan view.

As shown in FIG.
When the actuating piece 9 contacts and is pressed by the deformation of the detection protrusion 8, the actuating piece 9 moves against the elastic force of the internal or external spring to open the normally closed contact and perform the detection operation. 1st switch S ₁ , 2nd switch
Attach Switch S ₂ .

The above first switch S ₁ and second switch S ₂
As shown in Figure 3, the power supply 10 automatic switch
S ₃ and solenoids R and L of the electromagnetic valve constitute an automatic steering control circuit.

In the normal straight reaping state, the detection body 6 is located between the planted grain culms M, and as shown in FIG. do not. Therefore, the first switch _S1 and the second switch _S2 are not activated.

When the aircraft progresses toward the left side, as shown in Figure 4b, the left detection protrusion 8L comes into contact with the planted grain culm M and is pushed backward, and moves forward as the aircraft moves. , rotate in the direction of arrow A (counterclockwise). As the detection body 6 rotates, as shown in FIG. 5, the detection protrusion 8 presses the actuating piece 9 at a position facing the second switch _S2 , and switches the second switch _S2 at an angle of "θ". Activate it and turn it “OFF”. When the second switch _S2 is turned OFF, solenoid R is de-energized. As a result, the hydraulic valve of the hydraulic circuit of the hydraulic clutch for the right side clutch (not shown) is closed, and the right side clutch is disengaged.
Turn the aircraft to the right.

If the aircraft progresses toward the right side, as shown in Figure 4c, contrary to the case of the left side (Figure 4b), turn the first switch S ₁ in the B direction (clockwise).
Operate the switch to turn it “OFF”. As a result, the solenoid L is de-energized, closing the solenoid valve for the left side clutch and disengaging the left side clutch, causing the aircraft to turn to the left.

Since the detection protrusion 8 of the detection body 6 of the present invention can be elastically deformed, when it comes into light contact with the planted grain culm (when there is little deviation in the direction of movement of the machine), it deforms and escapes, causing it to approach the planted grain culm. The amount of rotation of the detection body gradually increases as the rotation speed increases (see FIG. 6).

As described above, the present invention provides a first switch and a second switch that control the operation of the solenoid of the steering solenoid valve based on the clockwise or counterclockwise rotation of the sensing object, and Because the protrusions are elastically deformable, it is difficult to cause misalignment when measuring the distance from the right or left even when there is a missing plant or a narrow space between plants.Also, the speed is fast because the intermittent pulse width is gradually increased due to elastic deformation. Cheng,
The closer you get to the planted grain culm, the greater the intermittent pulse input becomes, increasing the amount of correction the aircraft makes and stabilizing self-control. In other words, when the detection protrusion is elastically deformed and the deformation of the detection protrusion becomes large, the contact time between the detection protrusion and the grain culm or the detection protrusion and the detection switch is determined by using the star foil as a rigid body. Compared to the known technology, the pulse width is made longer, the pulse width is further increased, and the amount of correction is increased. This has the effect of increasing the pulse width by increasing the contact time (operating time of the switch) with respect to the amount of deviation more rapidly as the amount of deviation increases.

In addition, since the sensing body is a single component in which the disc part and the sensing protrusion are integrated, and the sensing body functions to increase the pulse width at an accelerated rate, the pulse width can be increased using a timer, electronic circuit, etc. Compared to the method of increasing the number of parts, this method has the effect of reducing the number of parts and reducing product costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an automatic steering sensor implemented in the present invention. FIG. 2 is also a plan view of the main parts. FIG. 3 is an electrical circuit diagram of the self-operation control circuit. Fourth
The figures are explanatory diagrams showing the detection action of the sensing body according to the present invention, in which a shows normal progress, b shows leftward deviation,
Figure c shows the case where the line is shifted to the right. FIG. 5 is an explanatory diagram showing elastic deformation of the detection protrusion. FIG. 6 is an explanatory diagram showing changes in switch operation time and changes in signal pulse width. 6... Sensing body, 7... Disk portion, 8... Sensing protrusion, S ₁ ... First switch, S ₂ ... Second switch.

Claims (1)

[Scope of utility model registration request] A detection body having a rotatable disc part mounted on a shaft below the weeding body, and a number of detection protrusions that protrude radially from the disc part, some of which protrude from both sides of the weeding body, and are elastically deformable. an automatic steering sensor comprising: a first switch that detects clockwise rotation of the detection body; and a second switch that detects counterclockwise rotation of the detection body.