JPS60192502A - Tractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a tractor, and more particularly to a tractor equipped with a work implement that can be raised and lowered.

When attaching a ground working device such as a rotary tiller to a mobile agricultural machine such as a tractor so as to be able to move up and down, the following procedure is generally followed.

That is, a three-point link mechanism consisting of a top link and a lower link is attached to the lifting/lowering part of the machine body, and the machine body is moved backward to be located near the ground work device. The top link is then attached to the ground work equipment, followed by the lower link. -Also, if the ground work equipment is heavy, it is difficult to match the connection position. In such a case, adjust the longitudinal position of the lower link by moving the aircraft forward and backward, and then move the lower link up and down by operating the lift position adjustment lever to raise and lower the lift arm and adjust the vertical position. It is connected.

When the ground work device is attached to the aircraft using such a procedure, there is a problem in that fine adjustment of the vertical position of the lower link by operating the vertical position adjustment lever is extremely complicated and requires a great deal of labor and time.

SUMMARY OF THE INVENTION Accordingly, the present invention aims to improve the above-mentioned problems of the prior art, and an object of the present invention is to provide a tractor in which a ground work device can be easily and quickly attached and detached.

The features of the present invention for achieving the above object are as follows:
); and a drive mechanism (5) that is linked to the support mechanism and moves the working machine up and down.
and operating means (67,
69), and a reference operation time setting means (71) for setting a reference operation time of the operation means corresponding to a preset minimum movement amount of the support mechanism, and a detection signal given from the operation means. and a reference value given from the reference operation time setting means, and if the detected value is smaller than the reference value, the support mechanism is moved by the set movement amount and the detected value is greater than the reference value. In a large scale, a tractor may be provided with comparison control means (75, 77) for outputting a drive command signal to the drive Ill mechanism in order to continuously move the support mechanism.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows a side view of a riding-type tiller in which a rotary tiller 1, which is an example of a ground work device, is attached to a moving layer 119 such as a tractor. The rotary tiller 1 is supported by a lifting suspension part 3 of a tractor 9 via a three-point link mechanism 15 consisting of a top link 11 and left and right lower links 13 so as to be able to rise and fall.

The elevating and lowering suspension part 3 consists of left and right lift arms 19 that are rotatably provided around a lift shaft 17, and the front end of the lift arms 19 and the intermediate part of the lower link 13 are connected by a lift rod 21. . The lift arm 19
is a drive device 5 such as a hydraulic actuator installed inside the fuselage 9.
It is driven up and down by the operation of. The hydraulic actuation device 5 is provided with a switching valve 23, and a spool 25 of this switching valve 23
is provided so that it can be moved left and right. As shown in FIG. 2, the spool 25 is constantly urged to move to the right by a tension spring 27.

A piston 31 is provided in the cylinder 29 of the hydraulic actuation device 5. The piston 31 is connected to an arm 33 that is integral with the lift shaft 17. The arm 33 is configured to rotate the lift arm 19 up/down by the operation of the piston 31 caused by the movement of the spool 25 in the left-right direction in FIG. The switching valve 23 switches the pressure oil to the cylinder 29 so that when the spool 25 is at the intermediate position of the left-right movement, the pressure oil in the cylinder 29 is maintained as it is and the cylinder 29 is in the neutral position.

Therefore, in the present invention, as shown in FIGS. 2, 3, and 4, the operating shaft 37 is pivotally connected to the cylinder case 35, and the arm 39 is fixed to the operating shaft 37 inside the cylinder case 35. do. A pin 41 implanted at the tip of the arm 39 is inserted into a long hole in the link 43, thereby interlocking the arm 39 and the link 43. The lower part of the link 43 is pivotally connected to a support shaft 45 fixed to the cylinder case 35, and the lower end is interlockingly connected to the lower part of the position link 47 via a pin 49.

The position link 47 is connected to the spool 25 by fitting a bottle 51 implanted into a long hole spool 25 provided at the lower end, and is interlocked to the lift shaft 17 at the upper end via a link 53.

A position arm 5 is provided on the outside of the cylinder case 35.
5 is fixed to the operating shaft 37.

The tip of the position arm 55 is operatively connected via a link 57 to the tip of an arm 63 fixed to an output shaft 61 of an electric motor 59. If the electric motor 59 rotates in the opposite direction when the lift arm 19 is in the upper position, the operating shaft 37 is connected to the arm 63 of the output shaft 61 and the link 57.
and is configured to rotate counterclockwise via a position arm 55. The position link 47 moves the arm 39 when the operation shaft 37 rotates as described above.
It receives the rotational force applied from the operating shaft 37 via the link 43 and the support shaft 45, and rotates counterclockwise in FIG. 2 about the support shaft 45. The spool 25 is configured to move to the right in the figure and lower the lift arm 19 by rotation of the position link 47.

The spool 25 rotates clockwise around the support shaft 45 as the position link 47 and the link 53 rotate clockwise together with the lift arm 19, and returns to the neutral position. The switching valve 23 stops discharging pressure oil from the cylinder 29. In this way, the lift arm 19 is configured to hold the position instructed by the position arm 55 driven by the electric motor 59.

The electric motor 59 is installed in the fuselage 9,
A lift operation switch 67 provided near the cockpit 65
The drive is controlled via the control device 7 by the lowering operation switch 69 and the lowering operation switch 69.

FIG. 5 shows a block circuit diagram of the control device 7, in which the raising operation switch 67 is connected to the timer circuit 71 and the timer circuit 7.
3 and is connected to a motor control circuit 77 via an OR circuit 75.

The lower operation switch 69 is connected to the timer circuit 7 similar to the above.
1 and a timer circuit 73, and is connected to a motor control circuit 77 via an OR circuit 75.

As shown in the time chart of FIG. 6, the timer circuit 71 is configured to operate for a set time T1 by turning on the ascending operating switch 67 or the descending operating switch 69.

Therefore, when the ascending operation switch 67 or the descending operating switch 69 is turned on, the timer circuit 71 is set @T1.
, the electric motor 59 is driven for a time T1 to slightly drive the hydraulic actuator 5 for lifting and lowering the lift arm 19 by a predetermined amount, thereby moving the lift arm 19 up and down by a predetermined amount of movement.

Further, as shown in the time chart of FIG. 6, the timer circuit 73 operates for a predetermined time T2 (T2 >-1'l) by continuously turning on the ascending operating switch 67 or the descending operating switch 69. It is configured to operate after a period of time has elapsed, and to operate continuously while the switch 67 or 69 is turned on. Therefore, the ascending operation switch 67 or the descending operating switch 69 is turned ON continuously.
Then, after the time T2 has elapsed, the timer circuit 73 is activated continuously, the electric motor 59 is continuously driven, and the lift arm 19 is activated.
The hydraulic actuator 5 that drives the lift arm 19 up and down is continuously driven, and the lift arm 19 is moved up and down continuously.

Next, the operation of the above embodiment will be explained.

Tractor now? ), when installing the rotary tiller 1 on a vehicle, a three-point link mechanism 15 consisting of a top link 11 and left and right lower links 13 is attached to the lifting suspension 3 of the machine body 9, and the left and right lift arms of the lifting suspension 3 are attached to the rotary tiller 1. 19 and the left and right lower links 13 are connected via lift rods 21, respectively. Then, the machine body 9 is moved backward to be located near the rotary tiller 1, and the top link 1-1 is attached to the rotary tiller 1. Next, lower link 1
3 to the 0-tary tilling device 1, but if the rotary tilling device H1 is heavy, it will be difficult to match the connection position, so first, align the front and rear positions of the 0-tary tilling device 13 by moving the machine body 9 back and forth. By turning on the raising operation switch 67 or the lowering operation switch 69 within a predetermined time of 12, the electric motor 5 is activated via the timer circuit 71 of the control device @7.
9 is driven for a set time T+, the hydraulic actuator 5 is slightly driven by a predetermined amount, and the lift arm 19 is moved up and down by a predetermined amount of slight movement to move the lower link 13 up and down to align the vertical position and connect it. .

In addition, when the lift arm 19 of the lifting suspension section 3 is moved up and down continuously, the timer circuit 73 of the control device 7 The electric motor 59 is continuously driven via the hydraulic working device 5 to continuously move the lift arm 19 up and down.

Note that the present invention is not limited to the above embodiment. Therefore, instead of providing the electric motor 59, the switching valve 23 can be operated electromagnetically. Alternatively, the electric motor 59 can be provided on the lift rod 21, and the lift rod 21 can be configured to be switchable between minute expansion and contraction and continuous expansion and contraction.

- As explained above, according to the present invention, when the detected value is smaller than the reference value, the support mechanism is moved by a preset movement amount, and when the detected value is larger than the reference value, the support mechanism is moved by the preset movement amount. Since it was decided to output a drive command signal to the drive mechanism in order to continuously move the support mechanism, when the detected value is smaller than the reference value, the ground work device moves the support mechanism by a preset minimum movement amount. It is possible to provide a tractor that can be easily and quickly attached and detached.

It has also become possible to easily adjust the tillage depth during tillage work.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a riding type tiller in which a rotary tiller, which is an example of a ground work device, is attached to a mobile agricultural machine such as a tractor, and FIG. Fig. 3 is a longitudinal cross-sectional side view of the main part of the holding part, Fig. 3 is a longitudinal cross-sectional rear view of the main part of the lifting and lowering part, Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 3, and Fig. 5 is a block circuit of the control device. FIG. 6 is an explanatory diagram showing a time chart based on the configuration of FIG. 5. 1... Ground work device (rotary tillage device) 3... Lifting suspension section 5... Drive device (hydraulic actuating device) 59... Electric motor 67... Lifting operation switch 69... Lowering Operation switch 71...Timer circuit 75...OR circuit 77...Motor control circuit Fig. 1 Fig. 3 2551 Fig. 4

Claims (1)

[Scope of Claims] A support mechanism for supporting a work machine so as to be able to move up and down; a drive mechanism that is linked to the support mechanism to move the work machine up and down; and a drive mechanism for moving the work machine up and down. and a reference operation time setting means for setting a reference operation time of the operation means corresponding to a preset minimum movement period of the support mechanism, and a detection signal given from the operation means. and the reference value given from the reference operation time setting means, and if the detected value is smaller than the reference value, the support mechanism should not be moved by the set movement amount, and the detected value is the reference value. A tractor characterized in that a comparison control means is provided for outputting a drive command signal to the drive mechanism in order to continuously move the support am when the value is larger than the value.