JP2865252B1 - Excavation method and device for long object - Google Patents

Abstract

A long cultivated soil that moves rearward due to the rotation action of the endless belt conveyor of a digging blade body that is distorted generates a distorted rear earth pressure on a long cultivated soil, and the upper part of the long one is inclined rearward. As a result, breakage occurs in the long part, and it is difficult to grip the long part, resulting in poor work efficiency. An endless belt conveyor (11) of a long excavating blade (8) is rotated at a speed corresponding to a work advance speed of a tractor (an input shaft (17) connected to a PTO shaft, a hydraulic pump (1)).
9, through the hydraulic pressure adjusting valve and the hydraulic motor 22), and the amount of movement of the lower surface of the cultivated soil block corresponds to the forward speed of the tractor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for excavating a long tall with a digging blade which is towed by a tractor and whose rear portion is inclined upward.

[0002]

2. Description of the Related Art Various types of long excavating devices have been conventionally proposed. However, a long excavating device is provided in which a cultivated soil block, whose long portion is protected and held by a digging blade body having a rear portion inclined upward, is sequentially raised upward. As shown in FIG. 3, the tractor requires a traction force against the frictional force between the upper surface of the digging blade and the lower surface of the cultivated soil block.
The rear part of the cultivated soil block 41 is constituted by an endless belt conveyor 41, the cultivated soil block is moved rearward by the rotation of the conveyor belt 41 induced by the frictional force between the upper surface of the conveyor belt 41 and the lower surface of the cultivated soil block, and the excavating blade is formed. Body 40
(See, for example, Japanese Unexamined Utility Model Publication No.
No. 21).

[0003]

SUMMARY OF THE INVENTION It has been found that the excavating blade provided with the above-mentioned endless belt conveyor and making an arc movement has the following disadvantages. (A) Generally, the rear earth pressure on the upper surface of the excavating blade body generated with the advancement of the operation of the tractor is small in a portion close to the top soil and large in a deep portion in the soil. By the way, even in the case of utilizing the rotation of the belt conveyor, the frictional force between the upper surface of the belt and the lower surface of the cultivated soil becomes considerably large in order to induce the rotation, as shown in FIG. The long frame 43 which receives the distorted rear earth pressure moves upward and backward while the lower portion thereof is behind the upper portion (the upper portion of the long frame 43 is inclined backward) (the vertical posture cannot be maintained). In addition, damage such as breakage may occur.

[0004] (b) In addition to the above-mentioned inclination of the long thigh 43 being induced, when the excavating blade body 40 is given an arc movement, the cultivated soil block that protects and holds the long thigh 43. The impact due to the greater deformation earth pressure is applied to the cultivation soil block, and as a result, the cultivation soil block collapses, and the block meanders on the conveyor belt 41. One long 43 breaks with the collapse. In addition, the cultivated soil block itself may be broken and a long one in the cultivated soil block may be broken at a stretch.

(C) As shown by a two-dot chain line in FIG. 3, when the digging blade body 40 makes an arc movement with the support shaft 42 as a fulcrum, the blade portion 44 constituting the front part of the digging body 40 also becomes The uncultivated soil in the deep part of the soil is pressed up and down by the blade portion 44 due to the circular motion, and this condition affects the tractor's tenacity and the whole long excavator vibrates up and down. Also, vibration is transmitted to the tractor to which the device is connected, and a large tractor is required to suppress the vibration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to eliminate the occurrence of a distorted rear side earth pressure in a cultivated soil that has protected and held a long one, and to keep a long one in a vertical position while keeping the long one in a vertical position. It is an object of the present invention to provide a method and an apparatus for excavating a long thing which does not damage the cultivated soil block moving backward on the excavation blade body and breaks, etc. .

[0007]

According to the long excavating method of the present invention, in order to achieve the above object, the grown long one is excavated on both sides and excavated to the lower end, and the rear is inclined upward. In the long excavation method of sequentially moving the long one upward and backward together with the cultivation soil by the excavated blade body, the endless belt conveyor constituting the rear part of the excavated blade body is rotationally driven at a speed corresponding to the work advance speed of the tractor. In addition, the conveyor belt protects and holds the long soil in the cultivated soil on the cultivated soil block, and moves upward and backward while maintaining the vertical posture.

The long excavating device of the present invention
In order to achieve the above object, a pair of excavating means which are driven by a mission input from the PTO of the tractor to excavate both sides of a long growing object, and a rear part of which is inclined upward behind the pair of excavating means. A digging blade provided, a motor that rotates via a drive medium from an input shaft connected to the PTO shaft, and an endless belt conveyor that is rotationally driven by the motor and constitutes a rear portion of the digging blade. With the rotation of the tractor of the belt conveyor at a speed corresponding to the work advance speed, the long soil in the cultivated soil is protected and held by the cultivated soil block, and moves upward and backward while maintaining the vertical posture. It is in.

[0009]

[Function] A cultivated soil block that has been moved backward by an endless belt conveyor of a digging blade that is rotated by a motor that operates at a speed corresponding to the tractor's work advance speed has a distorted rear earth pressure on a cultivated soil block that has protected and held a long one. There is no generation (because the friction between the upper surface of the belt and the lower surface of the cultivation soil is small), and it moves while maintaining the vertical posture for a long time, and does not give positive vibration to the excavation blade. It can be excavated without any damage and without damage.

[0010]

FIG. 1 is a perspective view of a long excavating apparatus directly used for carrying out a long excavating method. Driving sprockets 3 are arranged on the left and right sides of the mission 2 mounted on the base frame 1, and the excavation chain 4 wound around the driving sprocket 3 is rotated by the rotation of the driving sprocket 3 by an input from a PTO of a tractor (not shown). Rotate and move forward while excavating both sides of the long one. The excavation chain 4 is appropriately tensioned by a tension portion 6 attached to a boom 5 fixed to the outside of the base frame 1. Reference numeral 7 denotes a pair of support bars. The upper part is fixed to the base frame 1, and the lower part is fixed to the side surface of the side plate 9 of the digging blade 8 whose rear part is inclined upward. The front part is formed with a blade 10 and the rear part protects a long one.
An endless belt conveyor 11 (hereinafter, referred to as a “conveyor belt”) that moves the held cultivated soil upward and backward.

Reference numeral 12 denotes a pair of mast stays whose bases are pivotally connected to the front of the base frame 1.
And the rear is connected to one end of the hydraulic cylinder 14. The other end of the hydraulic cylinder 14 is connected to a pair of brackets 15 provided behind the base frame 1, and the hydraulic cylinder 1
The working posture of the base frame 1 is controlled via the mast stay 12 by the expansion and contraction operation of the work 4. Reference numeral 16 denotes a lower pin, which is configured to be movable left and right with respect to the base frame 1.

Since the above-mentioned configuration does not have any particular difference from the conventional long excavator, the detailed description of its operation and the like is omitted, and the configuration characteristic of the present invention will be described below. In FIG. 1, reference numeral 17 denotes an input shaft connected to a PTO shaft of a tractor (not shown), to which a sprocket 18 is attached. Reference numeral 19 denotes a hydraulic pump mounted on the base frame 1, on which a sprocket 20 is mounted, and a chain 2 wound around the sprocket 20 and the sprocket 18.
The pressure oil is generated by the rotation of the input shaft 17 via 1.

An oil supply pipe 23 and an oil discharge pipe 24 are connected between the hydraulic pump 19 and a hydraulic motor 22 housed and disposed inside the conveyor belt 11 constituting the rear part of the excavating blade body 8. A chain 28 is wound between a sprocket 25 attached to the hydraulic motor 22 and a sprocket 27 attached to the driving drum 26 of the conveyor belt 11.

Accordingly, the pressure oil generated from the hydraulic pump 19 which rotates with the rotation of the input shaft 17 supplies an oil amount controlled by an oil amount adjusting valve (not shown) to the hydraulic motor 22 through the oil supply pipe 23, and 22 is rotated. The rotation of the hydraulic motor 22 rotates a driving drum 26 via a chain 28 wound around sprockets 25 and 28, and the conveyor belt 11 rotates as the drum 26 rotates. The one corresponding to the control oil amount at the amount adjusting valve, that is, the moving speed of the conveyor belt 11 corresponds to the work forward speed of the tractor.

Therefore, as shown in FIG. 2, by utilizing the slight friction between the upper surface of the conveyor belt 11 and the lower surface of the cultivated soil protected and held by the conveyor belt 11, which is moved backward by the conveyor belt 11. , The amount of movement of the lower surface of the cultivated soil can be made to correspond to the work advance speed of the tractor,
There is no generation of distorted rear earth pressure in the cultivated soil, and the long 43 can be moved backward while maintaining the vertical posture. Although not shown, by arranging a plurality of convex portions on the surface of the conveyor belt 11, it is possible to secure a synchronous movement without a shift between the conveyor belt 11 and the cultivated soil block.

[0016]

【The invention's effect】

(1) Since the conveyor belt, which constitutes the rear part of the excavating blade body, rotates at a speed corresponding to the speed at which the tractor advances, the cultivated soil has no distorted rear earth pressure and grows in the cultivated soil. The long one that moves rearward while maintaining the vertical posture as it is does not have any damage such as breakage, and the long one can be easily gripped and the work efficiency can be improved. (2) Since the conveyor belt is not subjected to positive vertical vibration, the cultivated soil blocks moved backward by the conveyor belt do not collapse or break, and can be dug without causing any damage in the long run. While you can
Since there is no vibration at the blade portion of the digging blade, the size of the tractor can be reduced. (3) Since the motor for rotating the conveyor belt is disposed inside the conveyor belt, the digging device can be made compact. (4) Synchronous movement between the conveyor belt and the cultivated soil can be ensured by the plurality of protrusions provided on the surface of the conveyor belt.

[Brief description of the drawings]

FIG. 1 is a perspective view of a long excavating device.

FIG. 2 is a diagram illustrating a posture of a long object during excavation of the long object.

FIG. 3 is a schematic side view of a digging blade of a conventional device.

FIG. 4 is a view for explaining a posture of a long object during excavation of a long object in a conventional apparatus.

[Explanation of symbols]

 Reference Signs List 8 excavating blade body 10 blade section 11 endless belt conveyor 17 input shaft 19 hydraulic pump 22 hydraulic motor 23 oil supply pipe 24 oil drain pipe 25 sprocket 26 driving drum 27 sprocket 28 chain

Claims (4)

(57) [Claims] 1. A method for excavating a long one which has grown and excavated on both sides to a lower end of the long one, and sequentially moves the long one upward and rearward together with the cultivation soil by a dug-blade body having a rear portion inclined upward. In, the endless belt conveyor constituting the rear part of the digging blade body is driven to rotate at a speed corresponding to the work advance speed of the tractor, the conveyor belt protects and holds the long cultivated soil in the cultivated soil block, A long excavation method characterized by moving upward and backward while maintaining a vertical posture. 2. A pair of digging means which are driven to rotate by a mission input from a PTO of a tractor and excavate both sides of a long growing thing, and a rear part is disposed upwardly behind the pair of digging means. A digging blade, a motor that rotates via a drive medium from an input shaft connected to the PTO shaft, and an endless belt conveyor that is rotationally driven by the motor and forms a rear portion of the digging blade, By rotating the belt conveyor at a speed corresponding to the work forward speed of the tractor, the long soil in the cultivated soil is protected and held on the cultivated soil block, and moves upward and backward while maintaining the vertical posture. Long digging equipment. 3. The long excavating apparatus according to claim 2, wherein the motor is housed and disposed inside an endless belt conveyor. 4. The long excavating apparatus according to claim 2, wherein a plurality of convex portions are provided on a surface of the belt of the endless belt conveyor.