JPH0127602Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic plowing depth control device for agricultural tractors that detects the height of the work implement from the ground using a sensor and controls the work implement to move up and down to maintain a constant plowing depth. The present invention relates to a release detection device that notifies an operator of the release of the automatic plowing depth control.

Conventionally, by manipulating the operating lever to prevent the control link from abutting the rod of the hydraulic control valve regardless of movement from the ground height sensor,
The automatic plowing depth control was being canceled. However, since the automatic plowing depth control release position is continuous with the automatic plowing depth control depth position, it is difficult for the operator to judge whether the automatic plowing depth control is in the release position or not. The workers worked without knowing where they were, and the plowing depth increased, resulting in overload and problems such as engine stalling.

Therefore, in the present invention, a stopper and a switch are installed to restrict the movement of the transmission means that transmits the movement of the ground height sensor to the hydraulic control valve at a predetermined position corresponding to the release position of the automatic plowing depth, and to set the switch. To provide a release detection device for an automatic plowing depth control device which is configured to operate and notify an operator that automatic plowing depth control has been canceled by a warning means connected to the switch, thereby eliminating the above-mentioned drawbacks. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the agricultural tractor 1 has a body 2, and a top link bracket 3 is fixed to the rear of the body 2. A rotary working machine 7 is attached to the top link 5 pivotally supported by the bracket 3 and a lower link 6 pivotally supported below the rear of the machine body. A lift arm 9 operated by a hydraulic system is connected via a rod 10. Further, the working machine 7 has a main body 11 and a rotary 12, and behind the rotary 12 is a rear cover 1 whose upper end is pivotally supported by the main body 11.
Covered by 3. The rear cover 13 is urged downward by a spring and gravity, and serves as a leveler for leveling the soil tilled by the rotary 12, and also constitutes a ground height sensor of the automatic plowing depth control device. There is. As shown in FIGS. 2 to 4, a bracket 16 is fixed to the rear cover 13 by bolts 15, and a pin 19 is rotatably supported by a plate 17 fixed to the bracket 16. . Further, a rod 20 is slidably inserted into the pin 19, and the rod 20 is prevented from coming out by a nut 21, and a spring 22 is compressed so that the pin 19 is in a direction in which it abuts against the nut 21. That is, the rear cover 13 is biased in the direction of contacting the ground. In addition, the rotary body 11 has a bolt 23.
A bracket 25 is fixed to the bracket 25, and a sensor arm 26 is rotatably supported on the bracket 25. And the sensor arm 26
The other end of the rod 20 is connected to one end of the rod 20, and a wire 27 is connected to the other end, and the other end of the wire 27 is connected to a connecting link 29. Further, the connecting link 29 is connected to a control link 32 whose fulcrum 31 can be changed in position by an operating lever 30, and the control link 32 is connected to the rod 3.
The lift arm 9 is connected to a hydraulic control valve 36 that contacts the roller 35 of No. 3 and controls the hydraulic system of the lift arm 9.
The operating lever 30 is guided by a guide groove 37, and one end of the guide groove 37 is in a release position, adjacent to the release position is in a depth control position for automatic plowing depth control, and the other end is in a shallow control position. Continuous towards position. Note that numeral 39 in FIG. 4 is a spring that biases the wire 27 in the pulling direction.

A stopper 40 is fixed to the bracket 25, and the stopper 40 is attached to the rear cover 13.
contacts the sensor arm 26 after being rotated by a predetermined amount, and prevents further rotation of the arm 26. Further, a switch 41 is fixed to the stopper 40, and the sensor arm 26 is attached to the stopper 40.
At the same time, the switch 41 is turned on and the lamp 43, which is a warning means installed on the panel 42,
lights up. In addition, in the figure, 43 is battery, 45
is a harness.

Since the present embodiment has the above-described configuration, when the tractor 1 works in the field as shown in FIG. Hold. In this state, the control link 32 and the roller 3 of the rod 33
5 are in contact, and the movement of link 32 is rod 2.
5 to the hydraulic control valve 36.
In this state, when the rear cover 13 constituting the ground height sensor rotates in the direction of the arrow shown in FIG.
The control link 32 is rotated in the direction of the arrow in FIG. 4 via the rod 20, sensor arm 26, wire 27, and connection link 29, and the hydraulic control valve 36 is controlled via the rod 33 to move the lift arm 9 in the upward direction. control, and raise the work implement 7 so that the plowing depth reaches the set value. Conversely, when the rear cover 13 rotates in the direction opposite to the arrow, the control link 32 is rotated in the direction opposite to the arrow to lower the work implement 7 so that the plowing depth reaches the set value.

When the tractor 1 is to be used for tilling along the ridge, the control lever 30 is held at the automatic control release position shown by the chain line in FIG. In this state, the control link 32 and the roller 35 of the rod 33 are separated from each other, and the sensor arm 26 is fully rotated to the position where it contacts the stopper 40 based on the upward rotation of the rear cover 13. Also, control link 3
2 and roller 35 are kept apart. Therefore, in the automatic plowing depth control release position, the movement of the link 32 is not transmitted to the hydraulic control valve 36, and the automatic plowing depth is reliably released, and the sensor arm 26 is not brought into contact with the stopper 40. At the same time, the switch 41 is turned on and the lamp 43 lights up to notify the operator that the automatic plowing depth control has been cancelled. Then, when the rear cover 13 rides on the ridge and rotates further upward, as shown in FIG.
The pin 19 slides against the rod 20 against the spring 22 and moves the sensor arm 26 to the stopper 4.
0, only the rear cover 13 is released upward.

When working again using automatic plowing depth control, even when working at a deep position, the sensor arm 26 rotates based on the rear cover 13 at a position where it does not come into contact with the stopper 40, and the control link 32 moves from the rod 33. The hydraulic control valve 3 is in contact with the roller 35.
6 to perform automatic plowing depth control, and at the same time, contact between sensor arm 26 and switch 41 is cut off, lamp 43 is turned off, and the operator is notified that automatic plowing depth control is operating.

Also, set the operating lever 30 to the deepest position,
Even if the operator thinks that he is working with automatic plowing depth control, the control link 32 does not actually come into contact with the roller 35 of the rod 33 due to elongation, wear, or poor adjustment of the wire 27, connecting link 29, etc. Although it may be in the release position, when the sensor arm 26 comes into contact with the stopper 40 and reaches the release position, the switch 41 is immediately turned on and the lamp lights up, automatically controlling the plowing depth regardless of the position of the operating lever 30. Inform the operator that the has been released.

As explained above, according to the present invention, the stopper 40 and the switch 41 are installed, and the sensor arm 2 is placed at a predetermined position corresponding to the automatic tilling depth release position.
6 and activates the switch 41 to notify the operator that the automatic plowing depth control has been canceled by the warning means 43 connected to the switch, so that the automatic plowing depth control can be reliably canceled and , the operator can confirm that the automatic plowing depth control has been cancelled, and can prevent problems such as the plowing depth becoming too deep due to uncontrolled operation due to an erroneous operation, resulting in overload and stalling of the engine.

[Brief explanation of drawings]

Fig. 1 is a front view showing the rear part of the tractor to which the present invention is applied, Fig. 2 is a front view of the main parts showing the automatic plowing depth control state, and Fig. 3 is a front view showing the automatic plowing depth control release state. , FIG. 4 is a front view showing the automatic plowing depth control device. 7... Work equipment, 13... Sensor (rear cover), 16-29, 32-35... Transmission means, 2
6...Sensor arm, 32...Control link, 3
6... Hydraulic control valve, 40... Stopper, 41...
Switch, 43...Alarm device (lamp).

Claims (1)

[Scope of utility model registration request] The height of the work implement 7 above the ground is detected by the sensor 13, and the movement of the sensor is transmitted to the transmission means 16 to 29, 3.
2 to 35 to the hydraulic control valve 36 to control the elevation of the working machine to maintain a constant plowing depth, and to adjust the connection relationship of the transmission means to the hydraulic control valve.
In an automatic plowing depth control device that can set the plowing depth position of automatic plowing depth control and the cancellation of automatic plowing depth, a stopper 40 and a switch 41 are installed on the sensor side of the connection adjustment means 32 in the transmission means, The movement of the transmission means 26 is restricted at a predetermined position corresponding to the tilling depth release position, and a switch is activated to notify the operator that the automatic tilling depth control has been canceled by an alarm means 43 connected to the switch. A release detection device in an automatic plowing depth control device configured as follows.