JPH0412081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position control device for a left-right movable rotary device configured to allow a tilling section of a rotary tiller to move left and right with respect to a mounting frame.

When you want to till the desired position by tilting only the tilling section to the left or right with respect to the towing machine, operate the control lever while looking back from the driver's seat and visually check the movement status of the tilling section. However, there is a large inertia in the movement of the tilling section, and it is easy to repeatedly move it too far and return it too much, and it is difficult to operate the lever to move the tilling section to the desired position. be.

Therefore, in this invention, a feedback mechanism is provided to transmit the movement of the tilling section to a switching valve operated by an operating lever in order to supply and discharge pressure oil to the left-right moving cylinder, and the switching valve operated by the operating lever is provided with a feedback mechanism. The feedback mechanism operated by the movement of the tilling section returns the tiller to the neutral position, and when the tilling section reaches the position instructed by the operating lever, the returning operation is stopped at the neutral position. A feedback mechanism is constructed in the system so that the tilling section is automatically controlled to move to the position specified by the operating lever.

The specific structure will be described based on an example in which the rotary tiller is applied to a forward/reverse rotary rotary in which the direction of rotation of the tiller can be switched between forward rotation for downcuts and reverse rotation for upcuts. The device 1 is divided into an attaching frame 4 for attaching the device 1 to the traction machine 2 via a connecting mechanism 3, and a cultivating section 5. That is, the equipment frame 4 consists of a mounting body 7 attached to a mast 6 and a gearbox 8,
When the input shaft 9 supported by the gear box 8 is driven, the left and right output shafts 10 and 11 are respectively driven by a bevel gear mechanism, which will be described later, installed in the gear box 8, and the left and right hit pins 1 are driven.
2 and 12 are connected to the traction machine 2 by lower links 13 and 13, and the mast 6 is connected to the rear upper center of the traction machine 2 by a top link 14, respectively.

The tilling section 5 includes a mounting section 16 that can be attached to and detached from the mounting body 7 using mounting pins 15, and a pipe-shaped guide tube 1.
7 and 18 are fixedly installed, and the guide tube 1
Frame pipes 2 loosely fitted into 7 and 18 respectively
0 and 21, a drive case 22 and a side frame 23 whose upper portions are fixed to both ends of the frame pipes 20 and 21, respectively, and a tiller body which is pivotally supported at the lower part of the drive case 22 and side frame 23. 24, a main cover 25 that is fixed to the base plate 19 and covers the top of the tiller 24, and a rear cover 26 that is hinged to the rear of the main cover 25 (this is connected to a support rod not shown). (which is pressed against the surface of the cultivated soil by a spring stretched between them). Then, for example, the guide tube 18 of the mounting body 7 and the side frame 23 are connected by a left-right moving cylinder 27 and its piston 27a, a hydraulic pump 28 is attached to, for example, the upper part of the side frame 23, and the pressure oil of the hydraulic pump 28 is switched. valve 29
The piston 27a is supplied to the left-right moving cylinder 27 through the oil feed pipes 30 and 31 by the operation of , and the piston 27a is protruded or retracted toward the left-right moving cylinder 27, and the spool of the switching valve 29 is operated. The operating lever 32 is pivoted to a lever guide 34 provided near the driver's seat 33 so that it can be held by a friction brake at each rotating position, and the spool of the switching valve 29 is attached to an arm attached to an operating shaft 35. The operating arm 38 and the operating lever 32, which are provided so as to be able to be switched and moved by the rotational operation of the flexible tube 3, and are pivotally supported to the arm 36 by a pin 37
When the operating lever 32 is rotated to the left as indicated by the arrow A in FIG. The operation shaft 35 rotates in the B direction, and the hydraulic pump 2 is turned on by the switching valve 29.
8 is supplied to the left-right moving cylinder 27 and the piston 27a is retracted, so that the tilling section 5 is configured to move to the left.

The feedback mechanism 41 shown as an example of transmitting the movement of the tiller 5 to the operating arm 38 of the switching valve 29 has a pinion 43 and a gear 44 integrally supported by a case 42 attached to the base plate 19. A pinion 45 that is pivotally supported on the case 42 so as to mesh with the gear 44 is meshed with a rack 46 attached to the frame pipe 21, and the pinion 43
A rack 47 that engages with the case 42 is provided so as to be movable only in the left and right directions with respect to the case 42, and the rack 47 and the operating arm 38 are connected by a feedback wire 49 that is inserted through a flexible tube 48 and can be pushed and pulled. There is. Therefore, when the operating lever 32 is operated in the direction of the arrow A, the tip 49 of the feedback wire 49
While a remains stationary, the arm 36 and the operating arm 38
both turn in the direction of the arrow B, and the tiller 5 starts moving to the left as described above, and the rack 46 moves to the left as shown by the arrow in FIG. , gear 44, pinion 43, and rack 47, the feedback wire 49
will move to the left as indicated by the arrow in the figure,
The operating arm 38 is moved in the direction shown by the arrow U, but since the tip 40a of the operating wire 40 cannot be moved, the operating arm 38 rotates clockwise around the tip 40a as a fulcrum. , the arm 36 rotates in the direction opposite to the arrow B and returns the operating shaft 35 to the same direction, which is the direction of the neutral position, and in this way, the operating lever 32
When the tiller 5 reaches the indicated position according to the amount of operation, the arm 36 and the operating shaft 35 return to the neutral position, and the supply of pressure oil to the left-right moving cylinder 27 is stopped. ing.

Further, the lever guide 34 is provided with a movement position indicating scale I as shown in FIG. Note that the feedback mechanism 41 is not limited to the one shown in the drawings, and a link mechanism, a cam mechanism, or an electrical mechanism such as a potentiometer may also be used.

Note that the bevel gear 50 of the input shaft 9 is similar to the bevel gears 5 of the left and right output shafts 10 and 11, as shown in FIG.
1 and 52, respectively, so the hydraulic pump 2
The input shaft 53 and the output shaft 11 of the gearbox 8 are connected by a telescopic universal joint shaft 54 formed by spline fitting, and the input shaft 55 of the drive chain mechanism and the output shaft 10 of the gearbox 8 are housed inside the drive case 22. A flexible joint shaft 56 that can be expanded and contracted by spline fitting.
The input shaft 9 of the gearbox 8 and the PTO shaft of the traction machine 2 are connected by a telescopic universal joint shaft.

In addition, in order to change the state in which the cultivating body 24 performs forward rotation to reverse rotation, for example, remove the mounting pins 15, and then connect the joint bodies 54a and 56a of the universal joint shafts 54 and 56 to the input shaft. 53 and 55, and lift arms 56 and 56 are lifted and rotated, the mounting body 7 will be separated from the mounting part 16, leaving a plowing part on the ground. Move the machine 2 so that the traction machine 2 is positioned in front of the tiller 5 in FIG. , move the lift arms 56, 56 downward to fit the mounting body 7 into the mounting part 16, connect the mounting body 7 and the mounting part 16 with the mounting pins 15, and connect the input shaft 53 to the joint body 56a.
Furthermore, the input shafts 55 can be connected to the joint bodies 54a, and the rear cover 26 can be attached to the front side of the main cover 25. Bevel gear 51 of output shaft 10 and output shaft 1
Since the bevel gears 52 of No. 1 are in mesh with each other, in the state shown in FIG.
4 rotates in the forward direction, and when the connection direction of the traction machine 2 is changed as described above, the tiller 24 rotates clockwise due to the bevel gear 52 (not shown) in FIG. I decided to do it,
At this time, the traction machine 2 is connected to the front in the figure and moves to the left, so the cultivator 24 makes an up cut, which is a reverse rotation.

The position control device for a left-right moving rotary according to the present invention is configured as described above, and
A feedback mechanism 41 is provided which transmits the movement of the tilling section 5 to the switching valve 29 operated by the operating lever 32 to supply and discharge pressure oil to the left-right moving cylinder 27, and the switching valve is operated by the operating lever 32. 29 is returned to the neutral position by the feedback mechanism 41 operated by the movement of the tiller 5, and when the tiller 5 reaches the position indicated by the operating lever 32, the above-mentioned operation is performed at this neutral position. Feedback mechanism 41 so that the return operation is stopped
As a result, the tilling section 5 is automatically controlled to move to the position instructed by the operating lever 32, eliminating the need to repeatedly move too much and return too much as in the past. Moving operations can be performed extremely easily and accurately.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 is a perspective view of a rotary tiller, FIG. 2 is a plan view of the main parts thereof, and FIG. 3 is a perspective view of a feedback mechanism.
FIG. 4 is an explanatory diagram of the gears in the gearbox, and FIG. 5 is a control circuit diagram. Explanation of symbols, 4...Mounting mechanism, 5...Cultivating part, 2
7... Left and right moving cylinder, 29... Switching valve, 32
...Operation lever, 41...Feedback mechanism.

Claims (1)

[Claims] 1. In a left-right rotary in which the tiller is installed so that it moves left and right with respect to the mounting machine frame as the left-right moving cylinder moves, a switching valve is operated by an operating lever to supply and discharge pressure oil to the left-right moving cylinder. A feedback mechanism is provided to transmit the movement of the tilling section, and the switching valve operated by the operating lever is returned to the neutral position by the feedback mechanism operated by the movement of the tilling section. A position control device for a left-right moving rotary, comprising a feedback mechanism so that the returning operation is stopped at a neutral position when the tiller reaches the position indicated by the lever.