JPH0127601Y2 - - Google Patents

Description

[Detailed description of the invention] This invention allows the direction of rotation of the tiller to be changed between forward rotation (down cut) and reverse rotation by changing the connection direction of the rotary tillage device connected to the traction machine to the front and back. This relates to a sensor used to detect the plowing depth when automatic adjustment is made to a certain plowing depth specified by the plowing depth adjustment lever in a forward/reverse rotary rotary that is configured to be able to switch between certain plowing depths. .

In automatic plowing depth adjustment work, the vertical movement of the rear cover that is in sliding contact with the tilled soil surface is fed back to the work equipment elevation control mechanism by a sensor composed of a link mechanism, etc. The sensor is attached to the main cover that covers the top of the tiller. In the case of a forward/reverse rotary, each time the connection direction of the rotary tilling device is changed, the mounting position of the rear cover is also changed, so each time the rear cover is changed, the sensor mounting position must be moved to the side closer to the rear cover. There is the inconvenience of having to replace it.

Therefore, in this invention, the rotary tilling device is divided into a mounting frame that is connected to the traction machine via a connecting mechanism, and a tilling device main body that includes a tilling body.
In a forward/reverse rotary rotary system, which is configured so that the direction of rotation of the tiller body can be switched between forward rotation and reverse rotation by changing the mounting direction of the tillage device main body relative to the mounting frame, the rear cover is provided so as to be in sliding contact with the surface of the tilled soil. A hinge part is provided at the front part, the rear cover is attached to and detached from the main cover together with the hinge part, and a sensor is provided to feed back the up and down movement of the rear cover due to the sliding contact to the work equipment elevation control mechanism of the towing machine. The sensor is configured to be attached to the hinge portion, so that there is no need to change the sensor attachment even when changing the connection direction of the rotary tiller.

The specific structure will be explained based on an example shown in the drawings. A rotary tiller 1, shown in a side view in FIG. 1 and a perspective view in FIG. It is divided into a mounting frame 4 (FIG. 3) for mounting and a tilling device main body 5 (FIG. 4). That is, the mounting frame 4 has inverted U-shaped mounting frames 8, 8 on the left and right sides of the head 7 fixedly installed at the bottom of the mast 6.
, hit pins 9, 9 and rear cover pressing mechanism 1
0, and the tilling device main body 5 is
A gearbox 13 that pivotally supports the input shafts 11 and 12 in the front and back, a drive case 16 and a side frame 1 whose upper parts are fixed to the ends of pipe frames 14 and 15 extending left and right from the gearbox 13.
7, this drive case 16, and side frame 17
The tiller 18 is pivotally supported at the lower part of the plowing body 18, and the mounting plate 1 is fixed at both ends to the drive case 16 and the side frame 17 to the pipe frames 14 and 15.
Main cover 2 fixed via 9, 19
1 and a hinge portion 26 with mounting pieces 25, 25 that are removably attached to one of the brackets 22, 22, 23, 23 fixed to the front and rear edges of the main cover 21 with pins 24... The front cover 2 is attached to the front edge of the rear cover 28 and the main cover 21 which are hinged at 27.
9, and the bevel gear 31 of the output shaft 30, which is pivotally supported on the gear box 13 as shown in FIG.
2 and 33, a transmission shaft installed in the pipe frame 14 and connected to the output shaft 30 drives a drive chain mechanism in the drive case 16, and this drive chain mechanism drives the tiller. 18 is configured to rotate.

Then, the connecting direction of the attachment frame 4 to the tillage device main body 5 is changed, that is, either the input shaft 11 or 12 is driven by the PTO shaft 34 of the traction machine 2 (via the telescopic universal joint shaft 35). ), the tilling claws 36 of the tilling body 18 are rotated to the right as shown by the arrow in FIG. The operation is performed by connecting the left and right lower links 37, 37, which make up the coupling mechanism 3, to the hit pins 9, 9 of the mounting machine frame 4, and the top link 38 to the mast 6, respectively, and connecting them integrally with the piston of the lift cylinder. Rotating left and right lift arms 39, 39
The mounting machine frame 4 is lifted up by the lift rods 40, 40 via the lower links 37, 37, while the lower portions of the drive case 16 and the side frame 17 are supported by stands (not shown). At this time, a fitting recess 41 with a trapezoidal cross section formed at the lower part of the head 7 of the mounting frame 4 is fitted into a fitting convex portion 42 of the gearbox 13 with a trapezoidal cross section, and the mounting frame 8, 8 is fitted onto the pipe frames 14, 15, and the mounting plates 43, 43 placed on the main cover 21 below the pipe frames 14, 15 are attached to the mounting frames 8, 8. Since it will fit inside the front and rear legs of the tiller, by inserting the pin 44 through the mounting frame 8 and the plate 43, the tiller main body 5 will be connected to the mounting frame 4, and as shown in FIG. When the input shaft 11 is connected to the universal joint shaft 35 as shown in FIG. Note that the front cover 29 is attached only when up-cutting, but the rear cover 28 is always attached to the rear of the tiller 18.

As shown in FIG. 6, arms 47 and 48 are fixed to a rotating shaft 46 provided inside the sensor box 45, and the front arm 47 has a flexible tube 49 inserted therein that can be pushed and pulled. Feedback Choir 50
Also, the link 51 is attached to the rear arm 48.
A link 51 is inserted into one of the pin holes 53 of the metal fittings 52 attached to the rear cover 28.
The vertical movement of the rear cover 28, which is pushed by the rear cover pressing mechanism 10 and moves forward in sliding contact with the tilling surface, is controlled by the work equipment elevation control mechanism 54 via the feedback wire 50. It is formed as a sensor 55 that transmits the information.

As shown in FIG. 6, the work equipment elevation control mechanism 54 supplies pressure oil from the pump P to the lift cylinder 56.
Alternatively, the spool 58 of the control valve 57 to be discharged from now on is controlled by rotating the tillage depth adjustment lever 59, and the arm 6 is provided so as to be able to rotate together with the operation shaft 60 of the tillage depth adjustment lever 59.
A receiving plate 64 is fixed to an actuating arm 63 which is pivotally connected to the actuating arm 63 with a pin 62, and the feedback wire 50, which can be pushed and pulled, is pulled through so that the tip thereof comes into contact with the contact plate 64. The lower part of the operating arm 63 is brought into contact with the spool 58 via a suitable link mechanism 65. Therefore, if the plowing depth adjustment lever 59 is rotated, for example, in the direction of the arrow in FIG.
rotates counterclockwise around the contact point between the feedback wire 50 and the contact plate 64, so the link mechanism 65 and the spool 58 move to the right, and the pressure oil in the lift cylinder 56 flows through the control valve 57. Since the piston 66 moves backward and the lift arm 39 starts to move downward, the rotary tiller 1 descends, and the rear cover 5 is pushed up from the ground surface. 55 is actuated, the feedback wire 50 moves forward and the operating arm 63 is rotated clockwise around the pin 62 to move the spool 58 to the left. When the instructed plowing depth is reached, the spool 58 returns to the neutral position, so the discharge of pressure oil from the lift cylinder 56 is stopped and the rotary tillage device 1 is controlled to continue working at this plowing depth. be.

In addition to the illustrated example, the sensor 55 may be one that uses another mechanism such as a cam mechanism to control the movement of the link 51, and the rotary tilling device 1 may also be used in addition to the illustrated example. Frame 4
The gearbox 13 has an input shaft mounted only on one side of the front and rear, and output shafts are supported on the left and right sides respectively, and bevel gears are provided on the input shaft and the output shaft, respectively. It is also possible to have a structure in which one of the left and right output shafts is connected to the input shaft of the drive case 16 via a transmission shaft when they mesh with each other and change the connection direction of the rotary tillage device 1. It is not limited.

The sensor for automatic tilling depth adjustment in the forward/reverse rotary tilling device according to this invention is constructed as described above, and includes a hinge section 26 provided at the front part of the rear cover 28, and the rear cover 28 is connected to the main cover together with the hinge section 26. 21, and a sensor 55 for feeding back the vertical movement of the rear cover 28 to the working machine elevation control mechanism 54 of the traction machine 2 is attached to the hinge part 26, so that the direction of rotation of the tiller 18 can be changed in the forward or reverse direction. If the rear cover 28 is replaced together with the hinge part 26 when changing the connecting direction of the rotary tilling device 1 to switch to either of the two, the sensor 55 will also be relocated to the rear of the tiller 18, which is different from the conventional method. As in the case,
This invention eliminates the trouble of having to change the installation of the sensor separately, and also simplifies the forward/reverse switching operation.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a perspective view, Fig. 3 is a perspective view of the mounting machine frame, and Fig. 4 is a perspective view of the tilling device main body. FIG. 5 is a gear diagram in the gear box, and FIG. 6 is an explanatory diagram of plowing depth feedback. Description of symbols, 1... Rotary tilling device, 2... Traction machine, 3... Connection mechanism, 4... Mounting machine frame, 5...
Cultivating device main body, 18... Cultivating body, 21... Main cover, 26... Hinge portion, 28... Rear cover, 54... Working machine elevation control mechanism, 55... Sensor.

Claims (1)

[Scope of utility model registration request] The rotary tiller is divided into an attachment frame that is connected to the traction machine via a coupling mechanism and a tiller body that includes a tiller body, and the attachment direction of the tiller body with respect to the attachment frame is changed. In a forward/reverse rotary rotary that is configured so that the direction of rotation of the tiller can be switched between forward and reverse, a hinge is provided at the front of the rear cover that is in sliding contact with the surface of the tilled soil, and together with this hinge, the rear cover is used as the main Automatic plowing depth in a forward/reverse rotary tiller in which a sensor is attached to the hinge part so as to be removably attached to the cover, and to feed back the vertical movement caused by the sliding contact of the rear cover to the work equipment elevation control mechanism of the towing machine. Adjustment sensor.