JP2514746Y2 - Rear cover lifting device for rotary tiller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a lifting device for a rear cover of a rotary cultivator that raises and lowers the rear cover.

(B) Conventional technology Conventionally, as a rear cover lifting device for a rotary cultivator, it is already known that a main cover is supported so as to rotate back and forth around a rotary shaft, and a rear cover is rotatably attached to a rear portion of the main cover. Has been.

(C) Problems to be Solved by the Invention The known rear cover elevating / lowering device requires a strong support structure because not only the rear cover but also the main cover is pivotally adjusted.

Therefore, on the upper surface of the main cover, a plurality of pairs of support brackets that form a pair in the front and rear direction and that pivotally support sliding guides such as guide rollers are provided at intervals in the lateral direction. The arc-shaped rail frames are fitted so as to be rotatable back and forth, the rear ends of these rail frames are connected by a rotating frame, and the upper portion of the rear cover is rotatably attached to the rotating frame, and the rear cover is rotatable. The above-mentioned problems could be solved by supporting the device up and down by the telescopic drive device.

However, the rotary expansion / contraction drive device is often arranged at a position deviating from the center line of the rotary, such as a side surface portion of the top mast or a side of the gear case, and the load required for the rotation is not evenly applied, which causes a twist. Not only did it move badly, but because the motor jumped out, it was often hit by objects and damaged, and it interfered with other mechanisms.

(D) Means for Solving the Problems In the present invention, a plurality of pairs of sliding guides are provided on the upper surface of the main cover 11 so as to form a pair in the front-rear direction and are laterally spaced.
An arcuate rail frame 19 is fitted to the sliding guide so as to be rotatable back and forth, and a rotary type expansion and contraction drive device is installed below the tool bar vertical adjustment device to rotate the central portion of the rotary top mast 8 and the rear cover 21. The above-mentioned problem is solved by pivotally supporting it between the moving frame 20 and a bracket 28 provided at the center of the moving frame 20.

(E) Action When performing rotary tillage work, the rear cover was fixed to the gear case and chain case of the rotary tiller by the rotary expansion and contraction drive device for leveling and leveling after tilling, when the shallow tillage was performed. It is adjusted downward with respect to the main cover and upward when deep plowing.

The pivotable telescopic drive device has an upper end pivotally supported by a top mast in the center of the rotary upper part, and a lower end pivotally supported by a bracket provided at the center of a rotary frame connecting left and right rail frames. Therefore, if the length of the rotary type telescopic drive device is extended, the rail frame pivots rearward and the rear cover is lowered, and if the length of the rotary telescopic drive device is shortened, the rail frame pivots forward. Rear cover goes up.

A toolbar extends from the rear of the gear case to the rear,
Various attachments are attached to the tip to carry out auxiliary work of rotary tillage.

A tool bar up / down adjuster is pivoted between the topmost center of the top mast and the tool bar, behind the rotary type expansion / contraction drive device, and the relative position between the pawl and the attachment can be changed by turning the handle at the center of the top part. Can be done.

(F) Embodiment An embodiment of the present invention will be described with reference to the drawings. A rotary tiller is suspended at the rear part of a mission case of a tractor via a lower link, a top link bracket and a top link.

On the one hand, the power of the tractor drives the rear wheels to move forward, and on the other hand, it drives the tiller 12 from the PTO shaft through the gear case 7 and chain case 9 of the rotary tiller to cultivate the soil.

The cultivating part 12 has its upper surface covered with a main cover 11 and a rear cover 21 and its side surfaces covered with a side cover 10 to prevent scattering of soil and also to perform crushing and leveling operations.

A tool bar 14 is extended from the rear part of the gear case 7 to the rear, and various attachments are attached to the tip of the tool bar 14 to carry out additional work for rotary tillage.

A tool bar vertical adjustment screw is pivotally supported between the top mast 8 and the tool bar 14, and the relative position of the tiller 12 and the attachment can be changed by turning the handle on the top.

The main cover 11 is integrally fixed to the gear case 11, the chain case 9, etc., and the main cover 11
And a U-shaped rail frame 19 that supports the rear cover 21, which is a separate body. The guide roller (sliding guide body) that is paired with the upper surface of the main cover 11 in the front-rear direction and that includes the bearing 17 is provided as an axis. Plural sets of supporting brackets 16 are symmetrically provided with respect to the center line of the rotary.

The bearing 17 is fitted with a rail frame 19 which is guided to rotate back and forth in an arc shape, and the upper portion of the rear cover 21 is turnable on a turning frame 20 connecting the rear ends of these rail frames 19. Installed.

Between the top mast 8 at the center of the rotary upper part and the bracket 28 projecting at the center of the connecting frame 20 connecting the rail frame 19 below, between the front and lower positions of the tool bar vertical adjustment screw, an electric motor as a rotary type telescopic drive device. Cylinder 22 and ram
Since the electric cylinder 22 is pivotally supported, the electric cylinder 22 is rotated forward or backward to extend the length of the ram 23.
Rotates rearward to lower the rear cover 21, and when contracted, the rail frame 19 moves forward to raise the rear cover 21.

Further, the fulcrum shaft 29 at the upper end of the electric cylinder 22 and the fulcrum shaft 24 at the lower end of the ram are stroke sensors for detecting the distance between the fulcrums.
Since it also serves as the fulcrum of 33, not only is the structure simple and maintenance is easy, but it is also possible to accurately detect changes in distance and perform finer and more accurate plowing depth control.

(G) Effect of the Invention According to the present invention, a plurality of pairs of front and rear sliding guides are provided on the upper surface of the main cover 11 at a lateral interval.
An arcuate rail frame 19 is fitted to the sliding guide so as to be rotatable back and forth, and a rotary type expansion and contraction drive device is installed below the tool bar vertical adjustment device to rotate the central portion of the rotary top mast 8 and the rear cover 21. By pivotally supporting the rail frame with the bracket 28 provided at the center of the moving frame 20, the turning load of the rail frame is evenly applied, and the turning operation for moving the rear cover 21 up and down can be smoothly performed.

Further, since the rotary type expansion / contraction drive device is arranged behind the toolbar up / down adjustment device, it does not hit the object and be damaged or interfere with other mechanisms.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a side view of a rotary tiller, FIG. 2 is a perspective view of the rotary tiller, FIG. 3 is a plan view of the rotary tiller, and FIG. (A) and (b) are sectional views of the rail frame, and FIG. 5 is a perspective view. In the figure, 11 is a main cover, 12 is a claw, 17 is a bearing, 19 is a rail frame, 20 is a rotating frame, 21 is a rear cover, 22
Is an electric cylinder, 23 is a ram, 24 and 29 are fulcrum shafts, 28 is a bracket, and 33 is a stroke sensor.

Claims (1)

(57) [Scope of utility model registration request] 1. A plurality of pairs of sliding guides are provided on the upper surface of the main cover 11 so as to form a pair in the front-rear direction and laterally spaced.
An arcuate rail frame 19 is fitted to the sliding guide so as to be rotatable back and forth, and a rotary type expansion and contraction drive device is installed below the tool bar vertical adjustment device to rotate the central portion of the rotary top mast 8 and the rear cover 21. A rear cover lifting device for a rotary cultivator, which is pivotally supported between a bracket 28 provided at the center of a moving frame 20.