JPS5936969Y2 - Work equipment working height regulating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a working height regulating device for a working machine such as a rotary cutter, and is capable of always maintaining a predetermined working height simply by lowering the working machine.

A rotary cutter that is attached to the rear of a tractor body via a three-point linkage mechanism is conventionally well known.

This type of rotary cutter is equipped with a gauge wheel, but since the cutter frame is pivoted to the top mast and suspended by a hanging rope, the gauge wheel alone is not enough to keep the rotary blade horizontal. Therefore, position control of a hydraulic system is also used.

However, this position control requires the hydraulic lever to always be returned to a fixed position, which is very cumbersome to operate, and if this is done incorrectly, the rotary blade will be tilted and the cutting height will be uneven. Become.

In order to solve this problem, a working height regulating device for a working machine is disclosed in, for example, Japanese Utility Model Publication No. 49-18803 or Japanese Patent Publication No. 31-3708.

In this conventional type, the height is regulated by installing a chino between the lift arm and the lift rod, or by installing a chino between the top link and the work machine side. Since it is stretched straight in the front-rear direction (not swung in the left-right direction), when the length of the chino was adjusted, the adjustment allowance affected the height adjustment. .

That is, since the pitch of the saw teeth that lock the chino cannot be made smaller than a predetermined value, if the pitch is shifted by one pitch, the change in height becomes too large, making it impossible to make fine adjustments.

The present invention solves these conventional problems, and
The feature is that the work equipment is attached to the rear of the tractor body via a three-point linkage mechanism consisting of a central top link and a pair of left and right lower links, and the hydraulic system mounted on the rear of the tractor body is The lift arm allows the work equipment to be raised and lowered freely via a three-point linkage mechanism (6) The above regulation plan is connected to the work equipment side, and the work equipment is restricted from descending below a predetermined working height. In a working height regulating device for a working machine that is hooked on a top link, both ends of the regulation plan are hooked on both left and right sides of the working machine, and the center part is hooked on the top link. .

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
In the figure, 1 is a tractor body, 2 is a hydraulic system, and has a pair of lift arms 3.

Reference numeral 4 denotes a three-point link mechanism, which includes a top link 5 and a pair of left and right lower links 6, each of which is connected to the lift I arm 3 via a lift rod 7 at an intermediate portion thereof.

In addition to the conventionally known turnbuckle 8, the top link 5 includes:
It has an engagement plate 10 in which a sawtooth engagement portion 9 is formed.

Reference numeral 11 denotes a rotary cutter attached to the rear of the tractor body 1 via a three-point linkage mechanism 4, and consists of a top mast 12 and a cutter body 13 as a structure, and the cutter body 13 has a gear case 14 and a rotating shaft. 15, rotary blade 1
6 etc. are attached, and a gauge wheel 17 is also attached, and the rotary blade 16 is driven by power transmitted from the tractor body 1 via a universal joint shaft 18.

As shown in FIG. 2, a pair of mounting brackets 20 equipped with mounting pins 19 are attached to the front end of the cutter main body 13.
The cutter main body 13 is pivotally supported by the top mast 12 via the attachment pin 19, and is suspended by a hanging cable 21 which is hung from the upper end of the top mast 12 to the rear of the cutter main body 13.

An engagement plate 10 is removably pivotally attached to the upper end of the top mast 12, and a lower link 6 is connected to a mounting pin 19.

Note that the top link 5 is detachable from the top link mounting base 22 of the tractor body 1.

Reference numeral 23 is a regulation proposal, which has a dogleg-shaped engagement rod 24 and chains 25 connected to both ends thereof, as shown in FIG.
5 is connected to a connecting fitting 26 at the bottom of the top mast 12,
Further, the engagement rod 24 can be freely engaged with and disengaged from any engagement portion 9 of the engagement plate 10.

In other words, the regulation plan 23 has both ends locked to the left and right sides of the work equipment 11, and its center part locked to the engagement plate 10 of the top mast 12, so that it cannot be moved in the front-back direction and the left-right direction. It is laid out diagonally.

Next, the effect will be explained.

FIG. 1 shows the state during work, at which time the engagement rod 24 of the regulation plan 23 is engaged with one of the engagement portions 9 formed on the engagement plate 10 of the top link 5, and this regulation plan 23 prevents the top link 5 and the top mast 12 from rotating relative to each other in the direction in which the angle increases, and maintains the cutter body 13, that is, the rotary blade 16 horizontally at a predetermined cutting height. .

For example, when turning, the rotary cutter is cut by the hydraulic system 2.
The entire rotary cutter 11 is lifted up and lowered again after turning, but the chain 25 bends when the rotary cutter 11 is raised.
The engagement rod 24 remains parked at the predetermined engagement portion 9 of the engagement plate 10, and when lowered, the engagement rod 24 and chain 25 become approximately straight when lowered to the position shown in the figure. The rotary blade 16 is regulated horizontally at a predetermined cutting height.

When the cutting height changes, the engagement position of the engagement rod 24 with respect to the engagement portion 9 of the engagement plate 10 may be changed accordingly.

Regarding this engagement position change, since the restriction plan 23 is oblique in the front-rear direction and left-right direction, even if the position is changed significantly, there is little effect on the height direction.

That is, fine adjustment in the height direction can be performed.

In addition, regulation proposal 23 is not installed at an angle at one end in the left and right direction, but is installed at both the left and right sides.
No uneven force is applied to the work equipment, etc.

It goes without saying that the unevenness of the engaging portion 9 is formed to such an extent that the engaging rod 24 does not come off when moving up and down.

The regulation proposal 23 may be a chain, a hook, or the like.

As described above, in the present invention, the working equipment is regulated to a predetermined working height by hooking the regulation plan to the top link and regulating the relative rotation between the working equipment and the top link. A predetermined working height can be maintained by simply lowering the work equipment; for example, in the case of a rotary cutter as shown in the example, if it is lowered too much than necessary, the gauge wheel will touch the ground and the cutter body will fall forward. This prevents the cutting blade from tilting in the same way, and the rotating blade can be held horizontally at all times, so the cutting height remains constant and stable work can be performed.

Furthermore, since the working height is mechanically regulated, handling is extremely easy compared to position control using a hydraulic system.

Moreover, in this invention, the regulation plan is hooked to the top link, so the regulation plan does not get wedged between the tractor body and its attached parts when the work equipment is raised and lowered, and the operation is smooth and reliable. There is a large degree of freedom in design.

In other words, the lift arm of the hydraulic system is usually located forward of the rear end of the top link, so if the restriction plan is hooked to the lift arm, there will be problems such as the restriction plan being wedged between the lift arm and the tractor body, resulting in operational problems. In addition to this, there is also the problem that the degree of freedom in design is greatly restricted due to constraints on the tractor body side, but the present invention can solve these problems.

In addition, since the regulation plan is usually hooked onto the top link that protrudes rearward from the lift arm, it is easier to handle without being affected by wheels on the tractor body side, compared to when it is hooked onto the lift arm.

Furthermore, if the proposed regulation were to be applied to the lift arm of the hydraulic system mounted on the tractor body side, processing of the lift arm, that is, the tractor body side, would be required, but since it is structured to be hooked to the top link, it would be difficult to attach it. It is only necessary to process the top link that can be handled in a variety of ways, and therefore, the manufacturing cost is also extremely low.

Furthermore, since the proposed regulation is provided diagonally with respect to the front-rear direction and the left-right direction, fine adjustment in the height direction is possible by adjusting the engagement position in the front-rear direction, and it is possible to reduce the force that is uneven in the left-right direction. It will not give any damage to the work equipment, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being an overall side view and FIG. 2 being a perspective view of the main parts. 1... Tractor body, 2... Hydraulic system, 4... Three-point link mechanism, 5... Top link, 10... Person in charge Plywood, 11...
Rotary cutter, 12...) Hepp mast,
13...Cutter body, 23...Regulation proposal.

Claims (1)

[Scope of utility model registration request] The work equipment is attached to the rear of the tractor body via a three-point link mechanism consisting of a central top link and a pair of left and right lower links, and the three-point link mechanism is operated by a lift arm of a hydraulic device mounted on the rear of the tractor body. A work machine with the above-mentioned regulation plan hooked to the top link in order to allow the work machine to move up and down freely through the top link, connect the regulation plan to the work machine side, and regulate the work machine so that it does not descend below a predetermined working height. A working height regulating device for a working machine, characterized in that both ends of the regulation plan are locked to the left and right sides of the working machine, and the central part is hooked to a top link. Device.