JP2945850B2 - Excavator cutter, cutter control method, and cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter of an excavator for digging a trench for forming a continuous wall for water stoppage, foundation and the like in the ground, a control method of the cutter, and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, as an excavator for excavating a groove for forming a continuous wall, Japanese Patent Application Laid-Open Nos. 5-280043 and 5-28
As shown in the above publications, a chain type cutter is vertically mounted on a traveling cart (for example, a base machine of a crawler type crane), and the cutter is rotated and moved in a horizontal direction to thereby obtain a fixed width. It is known to continuously excavate trenches.

The cutter used in this excavator is shown in FIG.
As shown in FIGS. 2 and 13, an endless chain 2 is stretched between upper and lower ends of a cutter post 1 which is a vertically long box-shaped frame, and is provided on the outer peripheral side of the chain 2 via a bit plate 3 so as to face outward. The ground is excavated by the large number of excavated blades 4... To form a groove G.

In both figures, reference numeral 5 denotes a motor-driven chain drive sprocket (drive wheel) provided at the upper end of the cutter post 1, reference numeral 6 denotes an idle wheel provided at the lower end of the post 1, and reference numeral 7 denotes a drive. The rotating shafts (drive shafts) 8, 8 of the wheel 5 are bearings that rotatably support the drive shaft 7.

[0005]

Conventionally, in such an excavator, excavated gravel or earth and sand (hereinafter, referred to as "excavated") during work with the cutter installed in the ground or when the work is stopped.
The earth and sand) is the abdominal surface of the cutter post 1 (front and back surfaces)
1a, 1a and the front and rear surfaces G1 and G1 of the excavation groove G (hereinafter referred to as a ventral space) settle and solidify, or the earth and sand on the front and rear surfaces G1 fall and the soil is deposited on the ventral surface 1a of the cutter post 1. Pressure is applied, and this causes a so-called embrace phenomenon in which the cutter cannot move laterally.

[0006] When this embracing phenomenon occurs, large-scale and troublesome treatment by another device such as pulling up a cutter with a crane or excavating a vertical hole near the post abdominal surface 1a to loosen the ground is required, and the construction efficiency is greatly increased. There was a problem that it was lowered.

Therefore, the present invention prevents the embracing phenomenon,
An object of the present invention is to provide a cutter of an excavator, a control method of the cutter, and a device capable of easily restoring a state in which the cutter post can be moved laterally when an embracing phenomenon occurs.

[0008]

According to a first aspect of the present invention, a driving wheel rotatably driven by a motor is provided on one of the upper and lower sides of a cutter post, and an idler wheel is provided on the opposite side, respectively. An endless chain is stretched between the endless chains, and a number of excavating blades are protruded outwardly on the endless chain, and a stirrer for stirring the inside of the ventral space before and after the cutter post to loosen the earth pressure is provided. It is formed to project inward.

According to a second aspect of the present invention, in the configuration of the first aspect, the stirring body is provided within an excavation width of the excavation blade.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the agitator has a blade portion that can be excavated.

According to a fourth aspect of the present invention, in the configuration of the first or second aspect, a bucket whose scooping port is oriented in the rotation direction of the endless chain is used as the stirring body.

According to a fifth aspect of the present invention, in the configuration of any one of the first to fourth aspects, the agitator is detachably attached to the endless chain.

According to a sixth aspect of the present invention, there is provided a method of controlling a cutter of an excavator according to any one of the first to fifth aspects, wherein the agitator reciprocates at a portion other than the direction changing portion of the endless chain. This is for rotating the chain drive motor forward and backward.

According to a seventh aspect of the present invention, there is provided a cutter control device for an excavator according to any one of the first to fifth aspects, wherein a stirrer position detecting means for detecting a position of the stirrer; Motor control means for rotating the motor for driving the chain forward and reverse so that the stirring body reciprocates at a portion other than the direction change portion of the endless chain based on a signal from the detection means.

[0015]

According to the above construction, the rotation of the endless chain causes the stirrer to stir the earth and sand in the abdominal space to relax the earth pressure. Can be.

On the other hand, if the stirrer is detachably attached to the chain as described in claim 5, and is attached when a cuddling phenomenon occurs, the stirrer can be restored to a state in which it can be easily laterally moved by itself. be able to.

In particular, if a stirrer having a blade portion is used, the stirrer also performs an excavating operation.
Even when the embraced earth and sand is hard, the earth pressure can be more reliably relaxed by excavating the earth and sand.

Further, according to the configuration of the second aspect, the stirring body is provided within the digging width of the digging blade, as in the case where the stirring body is provided so as to protrude outside the digging width. , And there is no risk of movement resistance during lateral movement.
Rather, the agitator rotates within the excavation width and the earth pressure on the abdominal surface of the post is relaxed, so that the resistance of the lateral movement is reduced, and the lateral movement is facilitated.

Further, when the ground improvement is carried out simultaneously with the excavation of the trench, the stirring member can improve the stirring efficiency of the improved material and the excavated soil.

On the other hand, according to the configuration of the fourth aspect, a bucket whose scooping port is oriented in the direction of rotation of the endless chain is used as the agitating body, so that soil and the like can be scooped up at the same time as stirring, so that only mere stirring is performed. The efficiency of relaxing the earth pressure is higher than in the case.

Further, according to the configuration of the sixth and seventh aspects (the method of controlling the cutter, the same apparatus), the agitator is a structure (for example, of the drive shaft) of the same part at the direction changing portion of the chain by the drive wheel and the idler wheel. Bearing).

In other words, there is no problem that the amount of inward projection of the stirrer is limited in order to avoid this interference or that the structure needs to be modified.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

First Embodiment (See FIGS. 1 to 3) 11 is a cutter post, and 12 is this cutter post 11
, A driving wheel 13 provided at the lower end of the post 11, and an endless chain 14 spanned between the driving wheel 12 and the idler wheel 13. Are mounted outwardly via bit plates 16 on the outer periphery of the digging blade 1.
The groove G is excavated by the rotation of 5.

As shown in FIG. 3, the excavating blades 15 are formed in a plate shape having a blade portion 15a at the distal end, with the thickness direction surface facing forward and backward, and the distal end opened to the excavating surface G1 side. The base end is fixed to the outer surface of the bit plate 16 by welding or the like.

In FIG. 2, 17 is a drive shaft, and 18 and 18 are bearings for rotatably supporting the drive shaft 17.

In this cutter, stirring blades 19 are provided on the inner peripheral side of the chain 14 inward, that is, toward the abdominal space S.

Like the excavating blades 15, the agitating blades 19 are formed as excavating and agitating blades having a blade portion 19a at the tip, and the excavating width of the excavating blades 15 at a plurality of positions in the rotation direction of the chain 14. It is fixed to the inner surface of the bit plate 16 by welding or the like while being located in the W.

As described above, the stirring blades 19 are protruded toward the ventral space S, and the stirring blades 19 rotate in the ventral space S by the rotation of the chain 14 during excavation work. The earth 19 and the like in the abdominal space S are stirred by the wings 19.

As a result, since the earth pressure acting on the post abdominal surfaces 1a, 1a is reduced, the occurrence of the embedment phenomenon due to the earth and sand during the excavation or the work stoppage is prevented.

Particularly, in the case of this embodiment, the stirring blades 19.
However, since the excavating action is also performed by the tip blade portion 19a, even when the embraced earth and sand is hard, it can be cut down to more surely ease the earth pressure.

Further, since the stirring blades 19 are provided within the digging width W of the digging blades 15, the stirring wings 19 are provided so as to protrude outside the digging width W.
There is no possibility that ... will be the excavation resistance during normal excavation and the movement resistance during lateral movement.

Rather, since the agitating blades 19 rotate within the excavation width W to reduce the earth pressure on the abdominal surface of the post, resistance to lateral movement is reduced.

Further, when the ground improvement is carried out simultaneously with the excavation of the trench and the improvement material is introduced and mixed with the excavated soil by stirring, the stirring blade 1
9 improves the stirring efficiency of the improved material and the excavated soil.

Second Embodiment (See FIGS. 4 to 6) In the first embodiment, as shown in FIG. 2, a stirring blade 19 is connected to a chain drive system at a portion of the chain 14 where the drive wheel 12 and the idler wheel 13 change direction. Especially the rotating shaft 17 of the drive wheel 12
The inwardly protruding amount of the stirring blade 19 is reduced so as not to interfere with the bearing 18 that supports the agitator. Therefore, the range of stirring by the stirring blade 19 is also reduced.

Therefore, in the second embodiment, as shown in FIG. 4, the stirring blade 19 is connected to the bearing 18 at the chain direction changing portion by the drive wheel 12 in order to widen the stirring range and enhance the earth pressure relaxing effect. In this case, the agitating blade 19 is reciprocated at a portion other than the both-side turning portion (hereinafter, referred to as a non-turning portion).

The details will be described with reference to FIGS.
A stirring blade position detecting means 20 for detecting a position 9 (FIG. 5 shows an example in which two places are provided in each of the two non-converted portions, that is, four places in total).

The position signal from the stirring blade position detecting means 20 is input to the controller 21 and the controller 2
1, a motor control valve (electromagnetic switching valve) 22 for controlling the rotation direction and speed of a hydraulic motor 22 as a rotational drive source of the drive wheels 12 (chain 14) is switched and controlled.

The stirring blade position detecting means 20 includes:
An encoder for detecting the amount of rotation of the drive shaft 17;
For example, a limit switch or the like that is turned on or off by contacting the projection provided on the projection 9 can be used.

In FIG. 6, reference numeral 24 denotes a hydraulic pressure source for the hydraulic motor 22, and reference numeral 25 denotes a tank.

Based on a signal from the stirring blade position detecting means 20, the controller 21 rotates the motor control valve 23 forward when the stirring blade 19 reaches a preset upper and lower limit position in the non-converted portion. From the position a, a reverse rotation position c (b is a neutral position) or a reverse switching signal is output.

In this way, by rotating the motor 22 in the normal and reverse directions, the agitating blade 19 is reciprocated only in the fixed range A in the non-converted portion.

In this way, the agitation range in the abdominal space S by the agitating blades 19 can be increased while preventing the interference between the agitating blades 19 and the bearings 18, and the effect of relaxing the earth pressure can be enhanced.

By the way, such control can also be performed manually while the operator visually observes the stirring blade 19 or receives a signal from another operator.

Further, by increasing the diameter of the drive wheel 12, it is possible to take a means for preventing interference between the stirring blade 19 and the bearing 18. In this way, the chain 14 can be continuously rotated while expanding the stirring range.

Other Embodiments (1) In the above embodiment, the stirring blade 19 is connected to the bit plate 16.
In the example shown in FIG. 7, the stirring blade 19 is fixed, and the stirring blade 19 is rotated even during normal excavation.
To the bit plate 16 with bolts 26 and nuts 27
The stirrer blade 19 may be detached during normal excavation, and may be mounted and actuated when the embrace of the cutter post 11 occurs.

(2) As a modification of the stirring member, as shown in FIGS.
a, 28a are attached to the bit plate 16 in a state where the thickness direction faces the chain rotation direction (up and down), and a reinforcing wall 28b is provided between the two plates 28a, 28a to form a stirring body 28.
May be configured.

In this way, the contact area with the earth and sand can be increased, so that the stirring efficiency is high and the effect of relaxing the earth pressure is high.

As shown in FIGS. 10 and 11, the stirring body 2
9 may be formed in a bucket shape, and attached to the bit plate 16 with the scooping port 29a facing the chain rotation direction. In the figure, 29b is a drain hole provided at the bottom of the stirring body 29.

According to the agitating body 29, the earth and sand can be scooped up at the same time as the earth and sand are agitated, so that the efficiency of relaxing the earth pressure is higher than in the case where only the agitation is performed.

[0051]

As described above, according to the present invention, the earth pressure acting on the cutter post abdominal surface is agitated on the inner peripheral side of the endless chain provided with the excavating blade on the outer peripheral side by stirring the earth and sand in the abdominal space. Since a stirrer is provided to alleviate the turbulence, the stirrer can be permanently provided to prevent the embrace phenomenon.

Alternatively, the stirrer can be attached to and detached from the chain as in the fifth aspect of the present invention, and can be easily laterally moved by itself without using other large-scale equipment by attaching the stirrer when a cuddling phenomenon occurs. State can be restored.

In particular, if a stirring body having a blade portion is used as in the third aspect of the present invention, a digging action by the blade portion can be obtained. Earth pressure can be reduced.

According to the second aspect of the present invention, the stirrer is provided within the digging width of the digging blade. Also, there is no possibility of becoming a movement resistance at the time of lateral movement. Rather, the agitator rotates within the excavation width and the earth pressure on the abdominal surface of the post is relaxed, so that the resistance of the lateral movement is reduced, and the lateral movement is facilitated.

Further, when the ground improvement is performed simultaneously with the excavation of the trench, the stirring member can improve the stirring efficiency of the improved material and the excavated soil.

On the other hand, according to the invention of claim 4, wherein the scooping port uses a bucket whose scooping port is oriented in the rotation direction of the endless chain, it is possible to scoop up soil and the like at the same time. The efficiency of relieving earth pressure is higher than that of earth pressure.

Further, according to the invention of claims 6 and 7, the stirrer rotates forward and reverse so that the stirrer reciprocates at a portion other than the direction change portion of the endless chain. A part of the chain that is turned by the idler and is the same structure (for example, a drive shaft bearing)
There is no risk of interference.

In other words, there is no problem that the projecting amount of the stirrer is limited in order to avoid this interference, and conversely, it is necessary to modify the above-mentioned structure.

[Brief description of the drawings]

FIG. 1 is a schematic front view of the entire cutter showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a diagram corresponding to FIG. 2 showing a second embodiment of the present invention.

FIGS. 5A and 5B are diagrams for explaining the operation of the second embodiment of the present invention.

FIG. 6 is a diagram illustrating a configuration of a motor control system according to a second embodiment.

FIG. 7 is a partial horizontal sectional view showing a third embodiment of the present invention.

FIG. 8 is a partial plan view showing a modification of the stirring body.

9 is a sectional view taken along line IX-IX of FIG.

FIG. 10 is a partial plan view showing another modification of the stirring body.

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

FIG. 12 is a schematic front view showing a conventional cutter.

FIG. 13 is an enlarged sectional view taken along line XIII-XIII of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Cutter post 12 Drive wheel 13 Idle wheel 14 Endless chain 15 Excavating blade 19 Stirrer blade (stirrer) 19a Blade part of stirrer blade 22 Drive hydraulic motor 20 Stirrer blade position detecting means 21 Controller constituting motor control means 23 Same motor Control valve 28 Stirrer using plate 29 Bucket-like stirrer 29a Scooping port

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Gen 740 Ogibo-cho, Okubo-cho, Akashi-shi, Hyogo Pref. Kobe Steel, Ltd. Okubo Construction Machinery Factory (56) References Jiruka Sho 54-68403 (JP, U) JP 3-43412 (JP, B2) (58) Fields surveyed (Int. Cl. ⁶⁾ , DB name) E02F 5/06

Claims (7)

(57) [Claims] A drive wheel rotatably driven by a motor is provided on one of the upper and lower sides of a cutter post, and an idler wheel is provided on the opposite side, and an endless chain is bridged between the drive wheel and the idler wheel. A number of cutting blades are protruded outward from the endless chain, and
Stir the ventral space before and after the cutter post to reduce earth pressure.
Cutter excavator, characterized in that Mel stirring body is formed by collision set inwardly. 2. The cutter for an excavator according to claim 1, wherein the agitator is provided within an excavation width of the excavation blade. 3. The cutter for an excavator according to claim 1, wherein the agitator has an excavating blade. 4. The cutter for an excavator according to claim 1, wherein a bucket whose scooping port is oriented in the rotation direction of the endless chain is used as the agitator. 5. The stirrer is detachably attached to an endless chain.
An excavator cutter according to any one of the preceding claims. 6. The method for controlling a cutter of an excavator according to claim 1, wherein the stirrer reciprocates at a portion other than a direction changing portion of the endless chain. A method for controlling a cutter of an excavator, comprising: 7. A control device for a cutter of an excavator according to any one of claims 1 to 5, wherein a stirrer position detecting means for detecting a position of the stirrer, and a signal from the stirrer position detecting means. Motor control means for rotating the motor for driving the chain forward and reverse so that the stirrer reciprocates at a portion other than the direction change portion of the endless chain based on the control of the cutter. apparatus.