JPH0524276Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention digs the roots of trees in a potted manner by rotating two arc-shaped curved blades in a scooping shape around the axis of the drive shaft. The present invention relates to an excavator for digging, and in particular to the structure of an excavating section that includes the arcuate curved blade as a main part.

(b) Prior art The above-mentioned excavator is, for example,
This is known from Japanese Patent Publication No. 33874 and Japanese Patent Publication No. 59-1451, etc., but in the conventional type, two arcuate curved blades are arranged on the ground surface so as to have a circular shape in plan view. They were designed to rotate from standby positions, which are located 180 degrees out of phase, in directions approaching each other, dig through the soil, and dig up the tree with its root ball.

(c) Problems to be solved by the invention Therefore, in a conventional excavator, as long as the two arcuate curved blades are in the standby position, the tree to be excavated cannot be introduced into the space surrounded by them. Therefore, one of the arcuate curved blades is configured so that it can be opened laterally and laterally, which is different from the direction of rotation of the excavation. It is necessary to open the tree to introduce the tree to be dug into the enclosed space through the opening, and then close the arc-shaped blade as desired. Even after the tree is supported and transported to the desired location, the tree cannot be removed unless one of the arcuate curved blades is opened laterally.This poses a problem in that these operations are cumbersome and work efficiency is poor. It was hot.

The present invention was developed in view of these problems, and although it is an excavator that uses two arcuate curved blades to dig up a tree with its root ball, it has two arcuate curved blades. To provide an excavation part structure that enables efficient digging and transportation work without any need for opening/closing operations in a direction different from the excavation rotational direction.

(ii) Means for solving the problem In other words, the excavation section structure of the excavator in this invention is characterized in that the rear ends of two overlapping arcuate curved blade bodies b1, b2 are commonly attached and supported by a drive shaft 12 having a longitudinal axis P parallel to the center line of the vehicle body, and the front ends of both blade bodies b1, b2 are commonly attached and supported by a support shaft 18 arranged with their axes aligned on a forward extension of the axis P, and both blade bodies b1, b2 are rotated in the same direction by the drive shaft 12, rotating in an overlapping state from a waiting position on one lateral side of the vehicle body to a set position, and beyond the set position, only one blade body b1 rotates.

(e) Effect According to the excavator equipped with the excavating section of the present invention, in the standby state before starting excavation, the two arcuate curved blade bodies b1 and b2 overlap each other and move horizontally of the car body. It is located on one side, and the other side of the vehicle body is positioned so that it is open, and when the other side of the vehicle body is opened, it guides the tree to be excavated and places it at a predetermined location with respect to the two arc-shaped curved blades b1 and b2. can be located in

Then, when the arc-shaped curved blade bodies b1 and b2 start rotating, the double blade bodies b1 and b2 rotate in the same direction in an overlapping state from the standby position to the set position, and the two blade bodies b1 and b2 rotate in the same direction from the standby position to the set position, and touch the soil at the root of the tree. The cutting moves in a scooping manner, and after the set position, only one blade body b1 moves further into digging, and finally the root of the tree is cut off into a substantially hemispherical pot.

When the tree is separated with its root ball, the root ball is supported at two points by the double-edged blades b1 and b2 that are displaced in the rotational direction, so that the tree can be lifted in a stable position.

After the dug-up tree is stably supported by the double blades b1 and b2 as described above and transported to the desired location, if the double blades b1 and b2 are rotated in the return direction, the double blades b1 and b2 are Since the blades return to the overlapping state at the set position and then return to the standby state while remaining in the overlapping state, the blades can be easily removed from the root of the tree by this return movement.

(f) Examples The embodiments of the present invention will be explained in detail below based on drawings of specific examples, but first, the general structure of the entire excavator will be explained with reference to FIGS. 2 and 3. .

A indicates the body of the excavator, and the body A is configured to be self-propelled by linking the crawler running parts 2, 2 at the bottom of the chassis 1 to the engine 3 mounted on the chassis 1. The installed operating section (not shown) is configured to be able to control the vehicle body and excavation section.

At the front end of the chassis 1, a frame mounting part 6 is installed which includes a counter shaft 5 which is interlocked and connected to the engine 3 via a cut-out transmission part 4.

An elevating frame F is attached to the frame attachment portion 6, and the elevating frame F consists of a base frame 7, a drive mechanism 8 attached thereto, and a substantially rectangular shape in plan view extending forward from the base frame 7. It consists of a holding arm 9 and a support frame 10 hanging from the tip of the holding arm.

The base frame 7 of the elevating frame F and the base end of the drive mechanism 8 are attached so as to be able to swing vertically about the axis of the counter shaft 5.
It is provided so that it can be moved up and down by a hydraulic cylinder 11 that is interposed between.

Further, the drive mechanism 8 has an input shaft interlockingly connected to the counter shaft 5 installed at the rear, and a drive shaft 12 having an axis P parallel to the center line of the vehicle body so that its front end projects forward. , a vibration generating mechanism 13 for blade vibration is connected between the drive shaft and the input shaft.
and a blade rotation mechanism 14, which are interlocked and connected by a transmission section.

B is a blade, which is composed of double inner and outer blade bodies b1 and b2, which are curved in a substantially arcuate shape in the same plane and have an appropriate width in the direction of rotation. , a concrete example of its structure is shown in FIG.

In other words, the shaft joint body 15, which is integrally connected to the arcuate end on the rear side of the inner blade body b1, is connected to the outer blade body b2.
The shaft coupling body 15 is inserted into the hole 16 opened at the rear circular arc end with some play, and the shaft coupling body 15 is connected to the drive shaft 1.
2 is connected to the shaft joint body 17 at the front end to support the rear sides of the inner and outer double blade bodies b1 and b2, and the front sides of the inner and outer double blade bodies b1 and b2 are installed on the support frame 10 part of the lifting frame F. It is rotatably supported by a support shaft 18.

The support shaft 18 is supported by the support frame 10 by a universal bearing 19 with an axis that coincides with an extension of the axis P of the drive shaft 12, and a portion extending toward the drive shaft 12 includes: One clutch body 20 of the overload clutch installed at the circular arc end on the front side of the outer blade body b2 is loosely fitted and supported, and furthermore, an internal spline is formed in the spline-formed part from the fitting part of the one clutch body 20 to the tip. The spline hole of the other clutch body 21 installed on the blade b1 side is fitted and supported so as to be slidable in the axial direction.

The corresponding surfaces of both the clutch bodies 20 and 21 are formed with corrugated engagement surfaces that engage with each other and cause slippage when a load exceeding a certain value is applied.
a spring 2 interposed between the spring end stop 22 and the spring end stop 22;
3, the above-mentioned two engaging surfaces are normally maintained in an engaged state.

Note that 24, 25, and 26 are cover bodies that enclose and protect the overload clutch portion and the front support portion of the double blade body, and 27 and 28 are stoppers that limit the rotation of the outer blade body b2 within a certain range. , is installed at a necessary position on the fixed member side such as the support frame.

Next, the operation of a specific example will be explained with reference to FIGS. 4 to 8.

In the normal state before operation, the inner and outer blade bodies b1 and b2 are in the fourth position.
As shown in the figure, they are in their overlapping stop positions.
In other words, the outer cutter body b2 is at the upper limit position of the rotatable range limited by the stopper 27, and only the inner cutter body b1 is allowed to rotate further upward.

When performing excavation work, the lifting frame F is raised as shown in Fig. 3, and the double-blade bodies b1 and b2 are moved to the normal position before operation by moving the vehicle body A. , b2 is adjusted and set so that it is properly positioned with respect to the tree to be excavated.

Then, the drive mechanism 8 is operated to lower the lifting frame F while imparting vibration to the blade B, whereby the blade B descends and cuts into the soil at the root of the tree from the front part. Then, when the blade rotation mechanism 14 starts operating, the drive shaft 12 rotates and the power is transferred to the shaft coupling body 15,
17 to the inner cutter body b1 of the blade B, and is further transmitted to the outer blade b2 via the engaging portions of the clutch bodies 20 and 21 in the front overload clutch, so that the inner and outer blades b1 and b2 overlap. While remaining in the ivy state, the blade B rotates clockwise from the position shown in FIG. 4, and the entire blade B excavates the soil at the root of the tree.

When the digging rotation of the blade B advances to the position shown in FIG.
8 and is restricted from rotating any further. When the outer blade b2 stops, an overload is applied to the engagement surfaces of the clutch bodies 20 and 21, and the inner blade b1 engages the clutch body 21 along the axial direction of the support shaft 18. Since it acts as a pushing force in the direction of disengagement, the inner blade body b1 itself is elastically deformed and the spring 23 is compressed, causing slippage on the engagement surfaces of the clutch bodies 20 and 21.

Therefore, from the drive shaft 12 to the shaft coupling body 15,1
The inner blade body b1 continues to transmit power through 7 parts,
Regardless of whether the outer blade body b2 comes into contact with the stopper 28 and is stopped, it continues to be operated in the clockwise direction,
The soil is excavated from the state shown in Fig. 7 to the position shown in Fig. 8, and as a result, the soil at the root of the tree is separated from the surrounding soil in a substantially hemispherical potted state. In this way, when the potted-shaped excavation is completed, the inner and outer blade bodies b1, b2
are in a position shifted from each other as shown in Fig. 8, so if the elevating frame F is immediately raised,
The potted tree can be easily lifted in a stable supported state because the two misaligned parts of the pot are supported by the inner and outer blades b1 and b2.

After lifting the excavated tree, the vehicle body A is moved to the required location and the excavated tree is lowered. At this time, the inner blade body b1, which is at the excavation end position in Fig. 8, is returned counterclockwise and activated. and further, the outer blade b2
The blade B is removed from the pot by returning the same counterclockwise, and the inner and outer blades b1 and b2 that are returned are returned to their normal positions (the positions shown in Figure 4) before the start of operation. The machine is then stopped and prepared for the next excavation operation.

The excavator is also used to make a hole for transplanting at a tree planting site, and for such work, the inner and outer blades b1 and b2 of blade B are
For example, the excavation operation is carried out in the position shown in FIG. 7, in which the inner and outer blade bodies b1 and b2 are maintained shifted from each other in the rotational direction, so that the amount of soil lifted and removed is increased. It is used.

(g) Effect of the invention As described above, the structure of the excavating part of the excavator of the invention is such that the rear end sides of the two arc-shaped curved blade bodies b1 and b2, which can overlap each other, are aligned with the center line of the vehicle body. A support that is commonly attached and supported to the drive shaft 12 having a parallel axis P in the longitudinal direction, and that the front end sides of the double-blade bodies b1 and b2 are arranged so that their axes coincide with the forward extension line of the axis P. Both blade bodies b1 and b2 are commonly attached and supported on the shaft 18, and are rotationally driven in the same direction by the drive shaft 12, so that they rotate in an overlapping state from a standby position on one lateral side of the vehicle body to a set position. , Since the configuration is such that only one blade b1 rotates after the set position, in order to position the arc-shaped curved blade body in a predetermined manner with respect to the tree, the arc-shaped curved blade body is rotated in the direction of excavation rotation. There is no need for any pre- or post-actions such as opening and closing in different directions, and the structure is simpler and less cumbersome to operate compared to conventional similar types, allowing for efficient digging and transportation work.

When used for hole digging work, by maintaining the arcuate curved blades b1 and b2 at arbitrary positions in the rotational direction, the amount of excavated soil scooped up per operation can be increased, increasing efficiency. Ancillary effects can also be expected, such as being able to dig holes in the area.

[Brief explanation of the drawing]

The drawings show a specific example of the present invention, and FIG. 1 is a sectional view showing the main structure of the excavation part according to the present invention.
Fig. 2 is a plan view of the main parts of an excavator that implements the excavation section according to the present invention, Fig. 3 is a side view of the main parts of the excavator shown in Fig. 2, and Figs. 4 to 8 are the main parts of the excavator shown in Fig. It is an explanatory diagram of the operation of the devised excavation part. 12... Drive shaft, P... Axis center of drive shaft, B...
Blade, b1... Inner cutting body of blade, b2...
The outer body of the blade.

Claims (1)

[Scope of utility model registration request] The rear end sides of the two arc-shaped curved blade bodies b1 and b2 that can overlap each other are commonly attached and supported to the drive shaft 12 with the longitudinal axis P parallel to the vehicle body center line, and the double blade body b1 , the front end side of b2,
The double blade bodies b1 and b2 are commonly attached and supported by a support shaft 18 disposed with their axes coincident with each other on the forward extension line of the axis P, and the double blade bodies b1 and b2 are rotationally driven in the same direction by the drive shaft 12, An excavator characterized in that the machine rotates from a standby position on one side of the vehicle body to a set position in an overlapping state, and after the set position, only one blade body b1 rotates. Structure of the excavation part.