JPH0735557Y2 - Foreign material cutting mechanism for root cutting device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention has a blade for excavating earth and sand spirally attached to a vertical rotating shaft to form a substantially circular groove around a plant such as a tree trunk. The present invention relates to a mechanism for cutting roots of trees and other foreign substances in a digging device.

[0002]

2. Description of the Related Art For example, the applicant previously developed a root-cutting device for digging the soil around a tree for the purpose of digging up a tree and root-wrapping it for the purpose of transplanting, and some of the results have already been applied. Did. The root cutting device is very popular because it can excavate the soil around the roots of trees in a donut shape.
In the case of trees with large roots, the roots and other obstacles hinder smooth digging.

[0003]

[Problems to be Solved by the Invention] The present invention has been made by paying attention to the above-mentioned points, and the problem is that foreign matter buried in the earth and sand around the plant, such as the roots of trees, is removed by the rotating blade. It is to be able to crush and process with earth and sand during excavation.

[0004]

In order to solve the above-mentioned problems, the present invention has a blade 12 for digging earth and sand attached to a rotary shaft 11 which is rotatable about an axis in the vertical direction in a spiral shape. A means is provided in which a plurality of cutting blades 14 that are substantially parallel or inclined forward or backward with respect to the rotation direction are provided at the peripheral edge of the blade 12 at substantially equal intervals.

[0005]

1 and 2 show an entire root cutting device for trees and the like according to the present invention. This device has a bogie structure, and an openable and closable annular rotation support portion 15 which surrounds the plant P at the center is provided at one end of the carriage body 10, and both sides of the rotation support portion 15 and the carriage body 10 are provided. Wheels 1 at the other end
6, 16, 17 and 17 are provided in pairs. Plant P
The inner wheels 16 and 16 approaching the vehicle roll while supporting the load inside the bogie, and the outer wheels 17 and 17 located outside the bogie can support the load and rotate, and at the same time The direction is changed so that it can move around the plant P. Although the trolley body 10 shown in the drawing is a system for excavating by power,
It goes without saying that this may be a manual drive system.

A rotary blade as means Q for excavating earth and sand is installed in the center of the bogie main body 10, and the excavation means Q is driven by a drive source 18 composed of an internal combustion engine through a reduction mechanism 19. It has a vertical rotating shaft 11 that receives a force with a gear 20 and rotates, and a spiral blade 12 for digging earth and sand is provided on the rotating shaft 11. Movement around the spiral blade 12 It has a substantially semi-cylindrical discharge cover 21 that surrounds the latter half of the direction.

The illustrated blade 12 has a continuous spiral from the tip 22 to the bottom of the discharge blade 23 at the upper end, and has a constant outer diameter (rotation radius) from the rotating shaft 11. Therefore, when the blade 12 is rotated clockwise as viewed from above in FIG. 3, the earth and sand can be excavated, conveyed upward, and discharged from the discharge port 24 provided on the upper side surface of the discharge cover 21. Reference numeral 25 indicates the opening / closing door.

A plurality of cutting blades 14 are provided on the peripheral edge of the spiral blade 12 substantially parallel to the direction of the rotary shaft 11. The illustrated cutting blade 14 is provided so as to hang downward from the peripheral edge of the blade 12 in the axial direction, and the direction of the blade 14a is substantially parallel to the direction of the rotating shaft 11 (FIG. 4 (a)), and the inner or outer side. It is set so that it is not inclined toward either side (Fig. 4).
(B)). Several or more such cutting blades 14 are provided per revolution in the circumferential direction, and the cutting blades 14 are substantially aligned in the axial direction at the edges of the helix (see FIG. 3).

The cutting blade 14 is mainly intended for cutting the root R of the plant, but since it acts so as to pick up the buried sand or other foreign matter mixed in the soil, the blade 12 It is formed so as to have greater hardness and abrasion resistance. That is, when the cutting blade 14 is attached to the blade 12 by welding or the like, the cutting blade 14 is made of blade steel or the like. The cutting blade 14 can be formed by bending the blade provided outwardly in the radial direction on the outer edge of the blade and bending it downward. In that case, the cutting is performed by hardening the strength of the blade 14.

Further, the cutting blade 14 is not limited to the downward direction as illustrated, but the resistance to push up the earth and sand seems to increase, but the cutting blade 14 may be provided upward, or the cutting edge may project or retract backward or forward with respect to the rotation direction. You may incline like this. Such an inclination can reduce the resistance that occurs when rotating in sediment. The illustrated cutting blades 14 are independently provided on the vertically adjacent spiral blades 12 and all face downward, but this does not have to be the same, and the installation form such as its shape and position, Elements such as the number can be freely changed within the scope of the above description.

A second example of the cutting blade 14 is shown in FIG. This is an example in which the blade mounting base 14a is welded to the lower surface of the rotary vane 13 at its upper end surface 14b, and a blade member 14d having a blade tip 14c such as a cemented carbide tip at its tip is fixed to the receiving groove 14e of the mounting base 14a by a bolt 14f. Is. 14g and 14h show bolt holes. Also, the cutting blade 1
4 may be provided so as to straddle the plurality of rotary blades 13, 13. FIG. 7 is an example thereof, and the cutting blade 14 in the axial direction is fixed to the upper and lower rotary blades 13 by a stopper 14k.

The illustrated rotary blades are attached to the housing 27 so as to swing rearward in the moving direction (arrow in FIG. 3) at the time of excavation by the device of the present invention around a horizontal axis Y passing through a box 26 provided at the upper end of the cover. The dovetail housing 27 can be moved in the excavation radial direction by a guide mechanism 28 installed in parallel on the carriage main body 10. Reference numeral 29 denotes an operation shaft of the guide mechanism 28, and 30 denotes a steering handle for the apparatus, which is provided at an outer end portion of the carriage main body 10.

With such a device, when root cutting is performed to dig up a tree for the purpose of transplanting, the rotary blade 13
Are groove walls S1 and S2 on the left and right of the groove T excavated in the earth and sand
A region surrounded by a groove wall (not shown) on the front side in the excavation direction and a cover 20 on the rear side in the excavation direction constitutes a soil discharge path, and the excavated soil is carried upward and discharged outside the groove. During the work, it is assumed that the root R of the tree, which is the plant P, protrudes outward beyond the radius of the groove T. However, in the case of the present invention, since the rotary blade 13 is provided with a large number of cutting blades 14 and the root R overhanging in the earth and sand is cut at the same time as the excavation, obstacles such as the root R are crushed into chips. It will be.

[0014]

As described above, the foreign matter cutting mechanism of the present invention is
When cutting a trench around the trunk to cut the root of a tree, the roots of the tree present in the growing sand can be cut and finely crushed, so some foreign matter may be mixed. However, they do not become an obstacle and have an effect that the trench can be excavated smoothly. Further, since the cutting blade 14 according to the present invention has a function of crushing not only foreign matters such as roots but also soil and sand, excavation efficiency by the spiral blade can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a root-cutting device according to the present invention.

FIG. 2 is an explanatory cross-sectional view showing an operating condition of the above apparatus.

FIG. 3 is a perspective view of a rotary blade having a foreign matter cutting mechanism according to the present invention.

FIG. 4A is a front view showing an example of a cutting blade. (B) The same radial sectional view.

FIG. 5 is a front view showing a second example of a cutting blade.

FIG. 6 is an exploded perspective view of the above cutting blade.

FIG. 7 is a front view showing a third example of a cutting blade.

Claims (2)

[Scope of utility model registration request] 1. A rotary shaft 1 which is rotatable around a vertical axis.
1 has a rotary blade 13 in which a blade 12 for excavating earth and sand is attached in a spiral shape, and the rotary blade 13 is moved around a plant such as a trunk of a tree to form a substantially annular shape around the plant. Regarding the root cutting device for digging a groove, the rotary shaft 11
2. A foreign matter cutting mechanism for a root cutting device, comprising a plurality of cutting blades 14 which are substantially parallel to the direction of FIG. 2. The root cutting device according to claim 1, wherein a cutting blade 14 is provided around the rotary shaft 11 so as to hang downward or rise upward from the peripheral edge of the blade 12 having a plurality of spiral windings. Foreign matter cutting mechanism.