JP3220991B2 - Elevating control device for tractor working machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting and lowering control device for a tractor working machine, and more particularly to controlling a working position and a working posture of a working device connected to a tractor body with respect to a soil surface. It can be used for maintaining plowing depth.

[0002]

2. Description of the Related Art A tilling device is connected to the rear side of a tractor body so as to be movable up and down. In the cultivation depth control in which the lifting and lowering device is feedback-controlled while maintaining the cultivation depth constant, the vertical rotation angle of the equalizing plate is relayed to the lifting and lowering control device on the vehicle body side. The interlocking mechanical interlocking mechanism, or electrical equipment, etc., is the mechanical control of the hydraulic lift control valve on the tractor body side,
The setting is made according to a control mode such as electromagnetic. For this reason, depending on whether the relay interlocking device provided in the tillage device for interlocking between the leveling plate and the elevating control device is a mechanical interlocking mechanism or an electrical device, not only the difference between these devices but also the mounting Each case has a unique configuration and form.

[0003] The present invention shares such a flat plate, a case of a relay interlocking device attached to a tillage device, and the like, and can be used in any control interlocking mode.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and has taken the following technical measures. That is, in a tractor working machine that connects a working device 3 that is raised and lowered by the expansion and contraction of a lift cylinder 2 by hydraulic pressure to the vehicle body 1, the vertical swinging of a work grounding body 4 of the working device 3 is performed by turning arms 16 and 17. A mechanical interlocking mechanism 6 that relays and mechanically interlocks the hydraulic elevating control valve 5 on the vehicle body 1 side; and a potentiometer 8 that is electrically input to the controller 7 to control and interlock the hydraulic elevating control valve 5. Throat
A case 12 for selecting and mounting one of the cases;
The arm 12 has a rotating arm 1 of the mechanical interlocking mechanism 6.
6 and 17 support shafts 18 and potentiometer 8
The mechanical interlocking mechanism 6 by setting the
Or a common mounting portion for mounting and supporting the potentiometer 8
The lifting control device of the tractor working machine is characterized by comprising 13 and 13 .

[0005]

When the tractor body 1 travels and the work unit 3 performs a predetermined work on the ground, the work unit 3 of the work unit 3
The operation of the hydraulic lifting control valve 5 is controlled mechanically via the mechanical interlocking mechanism 6 of the working device 3 or electrically via the potentiometer 8 and the controller 7 while detecting the ground position and the ground posture of the working device 3. Then, the working device 3 is moved up and down by the lift cylinder 2 to maintain and maintain a constant posture.

[0006] When the form of the elevation control device of the working device 3 is the mechanical interlocking mechanism 6, the rotating arms 16, 17 of the mechanical interlocking mechanism 6 are housed in the case 12 and are attached to the working device 3. Attachment, the vertical movement of the work grounding body 4 is linked to the hydraulic lifting control valve 5. In the case where the elevation control device is of an electrically interlocking configuration by detecting the potentiometer 8 or the like, the potentiometer 8 is connected to the case 12.
The detection result is input to the controller 7 and a predetermined output is output to the hydraulic elevating control valve 5 to be operated.

As described above, when the mechanical interlocking mechanism 6 is accommodated and the potentiometer 8 is accommodated, the mechanical interlocking mechanism 6 can be mounted and supported by the common case 12, and the rotating arm shaft 18 of the mechanical interlocking mechanism 6 can be mounted. And the sensing shaft 36 of the potentiometer 8 at substantially the same position, so that the mechanical interlocking mechanism 6 or the potentiometer 8 can be attached and supported. For example, the working grounding body 4 of the working device 3 and the mechanical interlocking mechanism 6 or Potentiometer 8
Since the interlocking member 21 can be shared, the cost can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated example illustrates a case in which the tillage control of the tillage device, which is the working device 3, is performed. The mechanical interlocking mechanism 6 provided inside the case 12 is shown in FIGS.
A shaft 18 is provided between the brackets 14 and 15 screwed into the screw holes 13 serving as a pair of right and left mounting portions. The shaft 18 supports a bell crank 16 serving as a rotating arm and a wire arm 17. Pressed around the axis by a spring 19 having
The wire arm 17 is pressed against the bell crank 16, and the pin 20 of the wire arm 17 is maintained in a state of being constantly engaged with the bell crank 16. Further, the bell crank 16 is connected to a leveling plate which is the work grounding body 4 by a rod 21, and an inner wire which is an interlocking wire 9 is connected to the wire arm 17.

The case 12 is installed on the upper surface of a cultivation cover 23 with an open bottom surface as a mounting surface 22, and an appropriate number of portions on the outer peripheral edge portion are tightened with bolts 24 and mounted. This case 1
The second outlet 11 is provided opposite to the mounting position of the wire arm 17, and forms a bulging portion 27 so as to protrude in the direction of the interlocking wire 9 on the rotation side of the wire arm 17. The distal end of the outer wire 25 covering the outer periphery of the lock is locked to the outlet 11, and the locking position is adjusted by the adjustment nut 26.
It can be adjusted with. Reference numeral 28 denotes a connecting member for connecting the rod 21 to the leveling plate 4, and is attached to the leveling plate 4 by bolts 29.

The distal end of the interlocking wire 9 is connected to an arm 33 fixed to an interlocking shaft 32 of a hydraulic case 31 provided on a part of the tractor body 1, and the hydraulic shaft is moved up and down from the interlocking shaft 32 via a link mechanism or the like. The control valve 5 is interlocked. Reference numeral 33 denotes a wire receiver attached to a part of the hydraulic case 31, which receives the distal end of the outer wire 25 with an adjusting nut 34 so as to be adjustable.

The structure shown in FIGS.
The mechanical interlocking mechanism 6 is replaced with an electric device 8 composed of a potentiometer. In the case 12, a plate 38 in the form of a crank is inserted into the screw holes 13, 1.
3 and a potentiometer serving as the electrical device 8 is attached to the plate 38 with a screw 35, and the sensing shaft 36 of the potentiometer is projected toward the rod 21 connected to the flat plate, and fixed to the shaft 36. The rod 21 is connected to the arm 37 to be rotated, and the angle at which the leveling plate 4 rotates up and down around the axis 30 is detected by the potentiometer.

Further, the plate 38 has stoppers 54 and 55 for locking the upper and lower limit positions of the rotation range of the arm 37. A cord 10 is taken out of the electric device 8 and is inputted to a controller 7 installed on the side of the cockpit 39 of the tractor body 1 or the like. The cord 10 of the electrical device 8 faces the outlet 11 of the case 12, is pulled out from the outlet 11, and is connected to the controller 7.

The controller 7 outputs the hydraulic raising / lowering control valve 5 to control the tillage device based on a preset tillage depth to maintain and control the set tillage depth. When the tillage depth of the device changes, the work grounding body 4, which is a flat plate, operates to detect this change, and the electric grounding device 4 detects the change, and controls the elevation control valve 5 based on the detected value. The working device 3 is moved up and down to control the plowing depth to a set value.

As described above, in the embodiment in which the leveling control is performed by mechanically interlocking the leveling plate as the work grounding body 4 and the hydraulic elevating control valve 5, the bell 12 as the mechanical interlocking mechanism 6 is attached to the case 12. The crank 16 and the wire arm 17 are mounted on the cultivation cover 23 of the cultivator, which is the working device 3, and the flattening of the flat plate is performed through the bell crank 16, the wire arm 17, the interlocking wire 9, and the like. It is linked to the lift control valve 5.

In the case where a controller 7 for controlling the hydraulic elevating control valve 5 is provided on the vehicle body 1 side, when the controller 7 operates in conjunction with the control, an electric device 8 such as the potentiometer is provided in the case 12 and Hydraulic elevating control is performed via the controller 7 while electrically detecting vertical movement of the flat plate. In FIG. 8, the tractor body 1 has a front wheel 40 and a rear wheel 41, and has an engine 4
The working device 3 is connected to a rear portion of the vehicle body 1 by a lower link 43, a top link 44, and the like, and a lift arm 45 which is vertically rotated by the hydraulic lift cylinder 2 is connected to the lower link 43. To the working device 3 by the vertical rotation of the lift arm 45.

The working device 3 is a tilling device,
A tilling claw 48 is provided, and the tilling shaft 47 is rotated and tilled by interlocking with a power take-off shaft from the vehicle body 1 side. The tillage cover 23 that covers the upper rotating peripheral portion of the tillage claw 48 is provided at a fixed position, and the work grounding body 4 that is a flat plate is vertically rotated around the shaft 36 at the rear end of the tillage cover 23, The spring 49 is resilient to level the tilling soil surface. When the tillage device moves down and the tillage depth increases, the leveling plate is pushed up by the tillable soil surface, and is turned upward around the shaft portion 36. It is interlocked with the interlocking mechanism 6, the electric device 8, and the like.

Reference numeral 50 denotes a steering handle, 51 denotes a fender, and 53 denotes a tilling transmission case.

[Brief description of the drawings]

 FIG. 1 shows an embodiment of the present invention.

FIG. 1 is a plan sectional view using a mechanical interlocking mechanism.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a side sectional view of a work grounding body.

FIG. 4 is a rear sectional view of FIG. 1;

FIG. 5 is a plan sectional view using an electric device.

FIG. 6 is a side sectional view of FIG. 5;

FIG. 7 is a rear sectional view of FIG. 5;

FIG. 8 is a side view of the tractor working machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Lift cylinder 3 Working device 4 Working grounding body 5 Hydraulic lifting / lowering control valve 6 Mechanical interlocking mechanism 7 Controller 8 Electrical equipment 9 Interlocking wire 10 Code 11 Outlet 12 Case

Claims (1)

(57) [Claims] 1. A tractor work machine connecting the working device 3 is raised and lowered by the expansion and contraction of the lift cylinder 2 by the hydraulic to the vehicle body 1, the rotating arm of the vertical swing of the working grounding member 4 of the working device 3 16 , 17 via a mechanical interlocking mechanism 6 for mechanically interlocking the hydraulic elevating control valve 5 on the vehicle body 1 side;
The hydraulic lift control valve 5 is electrically input to the controller 7 and
One of the potentiometers 8 for controlling and interlocking
A case 12 to be selected and mounted.
2 includes rotating arms 16 and 17 of the mechanical interlocking mechanism 6.
And the sensing axis 3 of the potentiometer 8
6 and the mechanical interlocking mechanism 6 or
Common mounting parts 13 and 1 for mounting and supporting the
3. A lifting / lowering control device for a tractor working machine, wherein