JPH0412128Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lifting device for a rotary trencher.

(Conventional technology) Because the deep-plow excavation body of conventional large-scale rotary trenchers has a large diameter, sufficient ground clearance cannot be secured even when the three-point link of the tractor is raised and the excavation work unit is rotated upward. However, the working angle of a normal universal joint is limited, making it difficult to use.

In addition, in this type of trencher, the chain case in the excavation section is divided into two stages, upper and lower, and the lower end of the upper chain case and the upper end of the lower chain case are rotatably connected, and the lower chain case is connected to the upper chain case. Japanese Utility Model Publication No. 57-58300 discloses a technique for adjusting plowing depth by rotating relative to a chain case.

(Problems to be solved by the invention) In the above-mentioned known technology, the rotating part provided between the upper and lower cases from which the excavated soil flows out has a complicated structure, which causes many troubles. When the three-point link is raised to obtain ground clearance, the input shaft rises in parallel as shown in Figure 3 of the conventional example of the present application, so the mounting part of the universal joint is angled, causing joint noise etc. There was a problem.

Further, there is a wide-angle joint that has a large working angle, but it is expensive.

(Means for Solving the Problem) In order to solve the above problem, the present invention includes a mounting frame with a lower pin at the bottom and a mounting hole at the top, and a rotatable slide at the bottom of the mounting frame. The tip of the support frame, which supports the excavation part equipped with a large-diameter rotary consisting of a main transmission having an input shaft and a drive case, is fixed to the above-mentioned sliding material, and a hydraulic cylinder is used to attach the mounting frame to the above-mentioned sliding material. The present invention provides a rotary trencher to be attached to a three-point link of a tractor, which is characterized in that the upper part and the support frame are connected, and the input shaft and the tractor PTO shaft are transmitted by a universal joint.

(Function) When raising the excavation work section, raise the tractor three-point link and retract the hydraulic cylinder 9.
The support frame 4 is folded with respect to the lower part of the mounting frame 1 to ensure sufficient ground clearance, and the center of gravity of the work machine hardly moves.

Further, the angle on the working side of the universal joint 20 connecting the input shaft 18 and the PTO shaft 19 changes less than the conventional angle α (shown in FIG. 3). In other words, the mounting angle between the input shaft and the universal joint is small and remains almost straight, so there is no joint noise.

(Example) The present invention will be explained based on an example. FIG. 1 is a side view of this embodiment, and FIG. 2 is a plan view. Reference numeral 1 denotes a mounting frame having an opening-shaped cross section, with a lower pin 2 provided at the lower part and a mounting hole 3 bored at the center of the upper part. 4
is a support frame, and its tip is fixed to a sliding member 5 rotatably provided at both ends of the lower part of the mounting frame 1, and the drive unit consisting of the main transmission 6, the connecting joint 7, and the drive case 8 is connected to the support frame by the main transmission 6. It is fixed so as to protrude upward from 4. Numeral 9 is a hydraulic cylinder which connects both ends of the upper part of the mounting frame 1 and the support frame 4.

10 is an excavation body with a rotating disk 11 and a connecting member 1
2. The excavating blade 13 is fixed to the main shaft 14 protruding downward from the driving case 8, and the lower stage of the driving case 8, which is divided into an upper stage and a lower stage, is arranged within the width of the rotation locus of the excavating blade 13. , by burying it in a deep plowing ditch and plowing it deeply.

Reference numeral 18 denotes an input shaft which protrudes from the main transmission 6 and is connected to a PTO shaft 19 of the tractor by a universal joint 20.

A cover 15 is provided to cover the excavation body 10, and a guide plate 16 is provided at the rear end so that the excavation body 10 can be moved up and down by elastic force. 17
is the ground ring.

Incidentally, this embodiment is equipped with four excavating bodies 10.

(Effects of the invention) According to the invention, the structure is simple, the ground clearance is large, the change in the joint angle on the working machine side is small, and it can be manufactured at low cost. In addition, there is almost no movement of the center of gravity of the work machine when the excavation work section is raised. The benefits are great.

[Brief explanation of the drawing]

FIG. 1 is a side view of this embodiment. FIG. 2 is a plan view of this embodiment. FIG. 3 is a side view showing a conventional example. 1 is a mounting frame, 4 is a support frame, 5 is a sliding material,
6 is a main transmission, 8 is a drive case, 9 is a hydraulic cylinder, 10 is an excavator, 14 is a main shaft, and 18 is an input shaft.

Claims (1)

[Scope of utility model registration request] A mounting frame with a lower pin at the bottom and a mounting hole at the top, a rotatable sliding member at the bottom of this mounting frame, and a large diameter rotary machine consisting of a main transmission with an input shaft and a drive case. The tip of the support frame that supports the excavation section equipped with is fixed to the above-mentioned sliding member, and the upper part of the mounting frame and the support frame are connected by a hydraulic cylinder, and the input shaft and the tractor PTO shaft are connected universally. A rotary trencher that attaches to the three-point link of a tractor and features transmission via a joint.