JPH0217124B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a self-propelled vehicle equipped with a tilling rotary behind the propulsion wheels, and a ground body for setting the tilling depth of the rotary at the rear end thereof. The grounding body can be raised and lowered by a drive mechanism, and the grounding body is automatically controlled to raise and lower based on the tilt sensing operation of a tilt sensor mechanism provided on the aircraft side that senses the longitudinal tilt of the aircraft. The present invention relates to a walk-behind cultivator configured to maintain its posture within a set range.

[Conventional technology]

Conventional walk-behind cultivators have been configured to control the plowing depth by raising and lowering the ground-contacting body whenever the tilt sensor detects a tilt that exceeds a set value and receives a signal output from the tilt sensor. Showa 60-177717
issue).

[Problem that the invention seeks to solve]

However, in this case, there is no problem during normal work driving, but when turning the aircraft on a ridge, etc., the propulsion wheel is used as a grounding fulcrum and the control handle is lifted, and the tilling rotary and grounding body are maintained in a non-grounding posture. The aircraft is tilted forward and turns. Therefore, since the inclination sensor is in the inclination sensing state during the turn, the grounding body is operated upward to try to shift the aircraft to a horizontal attitude, but the grounding body is not forced to be lifted manually. Therefore, the grounding body may be operated to the upper limit position or a position close to it. For this reason, even if you finish the turn and try to move on to work, the ground contact body is at its shortening limit, so it takes time to extend it again and return to the original horizontal posture, and during that time it is difficult to stop the aircraft. There was a problem that led to a decrease in work efficiency.

An object of the present invention is to provide a device that can solve the problems associated with conventional configurations and improve work efficiency by adding a simple mechanism.

[Means for solving problems]

The characteristic configuration of the present invention is such that when the tilt sensor mechanism detects a tilt of the aircraft that is greater than the set tilt attitude, which is greater than the set tilt attitude, the automatic elevation control of the grounding body is canceled. The functions and effects are as follows.

[Effect]

In other words, by maintaining the plowing depth control mode in which the ground contact body is moved up and down based on the inclination detected by the inclination sensor that exceeds the set value, the plowing depth can be controlled in the same way as before during normal driving operations, and it is possible to When artificially inclining the ground object, focus on the fact that the inclination is much larger than the set value, and if the sensor mechanism detects a large inclination greater than the set value, automatic elevation control of the grounding body is performed. Since the configuration is such that the aircraft is released, it does not take much time to return the attitude of the aircraft to its original substantially horizontal attitude after re-landing during the aircraft turn. In addition, near such a ridge, the state of inclination hardly changes between before and after turning.
By stopping the lifting and lowering operation of the grounding body, there is almost no need for operation after re-landing, which is even more effective.

〔Effect of the invention〕

As a result, the work can be carried out smoothly without interruption when the machine turns at the edge of a ridge, etc., and the efficiency of the overall plowing work can be improved. However, in order to achieve the same effect, a swinging arm type sensor is provided on the tilling rotary and the grounding body to detect the grounding state of these, so that when the two are in a non-contact state, the raising and lowering operation of the grounding body can be performed. However, in this case, if the field surface is highly uneven and both sensors are in a non-contact state, the sensor will be activated even during normal work travel, and the elevation control of the grounding body will be stopped. However, in the case of the present invention, reliability is high because it is less affected by field conditions.

〔Example〕

As shown in FIG. 6, a pair of left and right propulsion wheels 1,
1, a tilling rotary 2 behind the machine, an engine 3 and a transmission case 25 at the front of the machine, and a control handle 4 extending toward the rear of the machine at the rear end of the self-propelled machine so as to act after tilling by the rotary 2. A tail wheel 5, which is one of the ground-contacting bodies disposed in The tail wheel 5 is configured to be capable of automatic lifting/lowering control based on the tilt sensing operation that is greater than or equal to the value, and the depth of penetration of the tilling rotary 2 into the ground reaches the set value by the lifting/lowering operation of the tail wheel 5 relative to the wheel 1. The walk-behind tiller is configured as follows.

As shown in FIG. 5, a lifting mechanism 6 for the tail wheel 5
In detail, the support shaft 8 of the tail wheel 5 is fitted and held in a support tube 9 fixed to the aircraft body side, and the screw shaft 10 screwed into the axial center position of the support shaft 8 is inserted into the support tube 9. Fix the position inside and hold this screw shaft 1.
0, the tail wheel 5 can be slidably operated via the support shaft 8, and the screw shaft 10 is interlocked with a motor 13 with a reducer 12 via a bevel gear mechanism 11 provided at its upper end. A drive mechanism 6 is configured by connecting them.

As shown in FIG. 7, the mission case 2
A swing type operating arm 27 of a clutch 26 that connects and disconnects the power transmitted to the tilling rotary 2 provided in the tilling rotary 2.
An electromagnetic solenoid 28 that is turned off when energized is interlocked, and a hand-operated lever 29 that allows manual operation of the clutch 26 is interlocked with the operating arm 27 via a flexible spring 35. Even when the operating lever 29 is in the engaged position, the elastic force of the spring 35 allows the electromagnetic solenoid 28 to disengage the clutch 26. In the figure, reference numeral 32 denotes a spring that biases the operating arm 27.

As shown in FIGS. 2 to 4, the tilt sensor mechanism 7 is composed of a first tilt sensor 23 and a second tilt sensor 24. A weight 1 is attached to the horizontal support shaft 15 so as to be able to swing around this axis P.
6 is suspended, and a pair of switches 18a and 18b are attached to the disc 17 attached to the horizontal support shaft 15 so as to be distributed on the left and right sides with respect to the weight 16, and provided on the support arm 19 that supports the weight 16. an operating section 19a for the switches 18a and 18b;
19b is extended so as to come into contact with the switch 18a or 18b when the weight 16 swings beyond the reference setting range (B). That is, when the switches 18a and 18b are not activated, the weight 16 is within the reference setting range B. In other words, the weight 16 will not sense an inclination that exceeds the set value, and the plowing depth will be kept constant regardless of slight irregularities on the field surface, thereby preventing frequent operation of the tail wheel 5. There is. Furthermore, when either switch 18a or 18b is activated, the aircraft body tilts in the direction in which the switch is installed, and since the tilt is greater than the set value, the switch 18
The signals of a and 18b are transmitted to the motor 13 via the drive circuit 22, and the tail wheel 5 is raised and lowered to return the aircraft to a substantially horizontal position, and the rotary 2 is moved along the slope of the field surface. There is.

As shown in FIG. 9, the switch mounting disc 1
7 is frictionally fixed to the horizontal support shaft 15 and can be rotated artificially against this frictional force, and water bubbles are formed on the machine body side corresponding to the plowing depth scale 20 provided on this disc 17. A type level 21 is installed, and after adjusting the level 21 so that the machine is in a horizontal position before starting work, the disc 17 is manually rotated to set it at the set plowing depth scale. The rotary 2 is configured to reach a set plowing depth by raising and lowering the tail wheel 5.

To explain the second inclination sensor 24 in detail, the second inclination sensor 24 is
As shown in FIG. 4 and FIG. 4, a weight 30 is suspended from the horizontal support shaft 15 so as to be swingable around the axis P, and an actuating portion 31a provided on the support arm 31 for the weight is provided. , 31a are used as switches 32a, 32b for sensing only when the swing exceeds the reference setting range (B'), which is larger than that of the first tilt sensor 23.
It extends so as to come into contact with the. That is, the first
Compared to the inclination sensor 23, the second inclination sensor 24 is configured to operate when it senses a tilted posture that is greater than the set inclination and is greater than or equal to the set inclination of forward downhill.

As shown in FIG. 8, the first tilt sensor 23
and a signal from the second inclination sensor 24 is connected to the ground body drive circuit 22, and a signal from the second inclination sensor 24 is connected to the operating circuit 33 for the electromagnetic solenoid 28. As shown in FIG. 2B, when the aircraft is tilted forward and downward in order to raise the rotary 2 above the ground during a turn, the second tilt sensor 24 senses this and stops the vertical movement of the tail wheel 5. In addition, the electromagnetic solenoid 28 is operated to automatically stop the drive of the rotary 2 floating above the ground, thereby ensuring safety. Further, when the second sensor 24 is not operating, the drive circuit 22 is controlled by the signal from the first sensor 23.

Incidentally, an electromagnetic clutch may be used as the on/off clutch 26 for the tilling rotary 2.

[Another example]

As shown in FIG. 10, as the inclination sensor mechanism 7, a weight 16 that can swing around the axis of the horizontal support shaft 15 is provided, and a switch provided on a support arm 19 that suspends and supports the weight 16. A switch is provided with actuating parts 19a and 19b for the body, and performs a tilt sensing action by contact with the actuating parts 19a and 19b due to the swing of the weight 16 due to the inclination of the aircraft body.
A contact switch 34 made of a piezoelectric element or the like that can detect the inclination of the aircraft by contact sliding within a small range, and a micro switch that can be operated in contact when the inclination of the aircraft exceeds a certain set value beyond the small range. A single tilt sensor composed of 36 may also be used.

[Brief explanation of drawings]

The drawings show an embodiment of the walk-behind cultivator according to the present invention, in which FIG.
Fig. 2 is a side view of the sensor mechanism, Fig. 3 is a front view showing the first sensor, Fig. 4 is a front view showing the second sensor, and Fig. 5 is a partially cutaway side view showing the drive mechanism of the grounding body. , Fig. 6 is an overall side view, Fig. 7 is a side view showing the clutch operating mechanism, Fig. 8 is a control circuit diagram, and Fig. 9 is a side view showing the clutch operation mechanism.
The figure is a front view of the first sensor showing the plowing depth setting state, and FIG. 10 is a front view showing another embodiment of the sensor mechanism. 1... Propulsion wheel, 2... Tilling rotary, 5...
...Grounding body, 6... Drive mechanism, 7... Tilt sensor mechanism, 23... First tilt sensor, 24... Second tilt sensor.

Claims (1)

[Scope of Claims] 1. A grounding body 5 for setting the tilling depth of the rotary 2 is connected to the rear end of a self-propelled machine equipped with a tilling rotary 2 behind the propulsion wheels 1, and this grounding body 5 is connected to a drive mechanism. 6, and based on the tilt sensing operation of a tilt sensor mechanism 7 provided on the fuselage side that senses the tilt of the fuselage in the longitudinal direction, the grounding body 5 is automatically controlled to ascend and descend to maintain the longitudinal tilted posture of the fuselage. In a walk-behind cultivator that is configured to be maintained within a set range, when the inclination sensor mechanism 7 detects a body inclination greater than or equal to the set inclination attitude that is greater than the set inclination attitude, the ground-contacting body A walk-behind cultivator configured such that the automatic elevation control of No. 5 is canceled. 2 The sensor mechanism 7 includes a first sensor 23 for automatic elevation control and a second sensor that detects a tilt of the aircraft that is greater than or equal to the set tilt attitude, which is greater than the set tilt attitude.
A walking cultivator according to claim 1, which comprises a sensor 24. 3. The walking cultivator according to claim 1, wherein the sensor mechanism 7 is composed of a single sensor.