JPH0355322A - Excavator - Google Patents

Abstract

PURPOSE:To facilate operation by supporting a bearing arm with a rotatably connected excavating arm, on a moving base, to be raised, fallen, or swung on the moving base, and by fitting the moving base on a base machine, to be moved to the front and rear. CONSTITUTION:On a base machine 1, a moving base 2 is supported to be moved to the front and rear, and a bearing arm 4 and an excavating arm 5 are supported by a swinging body 3 supported to be swung on the moving base 2. Besides, first and second carrying arms 6, 7 are supported by the swinging body 3. Then, in a state that the bearing arm 4 and the excavating arm 5 are fixed to be positioned at a fixed position, the moving base 2 is moved in the front and rear directions, and the channel of a fixed depth is excavated, and by the front and rear movement of the moving base 2 and the swinging of the bearing arm 4, a wide channel is excavated without moving the base machine 1. As a result, excavation can be quickly performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an excavation method used for installing underground pipes, such as water pipes, gas pipes, and power transmission pipes, by the cut-and-cut method, for example, under roads in urban areas. It is related to the device.

[Conventional technology]

Conventionally, as drilling equipment, for example, Japanese Patent Application Laid-Open No. 62-28011
What was proposed in Publication No. 3 (hereinafter referred to as the first conventional device)
and the one proposed in Japanese Patent Application Laid-Open No. 64-6492 (
(hereinafter referred to as the second conventional device) are known. In the first device, the rotary tube is rotatably installed around the axis between the fixed tube and the fixed cover, and the screw conveyor is disposed to pass through these, and the inner circumferential surface of the rotary tube and The outer circumferential surface of the screw conveyor is welded, and the screw conveyor is configured to be driven to rotate by rotating this rotary tube. Also this first
In the conventional device, a pair of screw conveyors are connected to each other via a flexible tube, and excavated earth and sand are transported through the flexible tube. Furthermore, one side of the fixed cover is opened,
A claw-shaped shovel is protruded from the periphery of the screw conveyor located within the fixed cover.

In addition, in the second conventional device, a support arm is attached to the base machine so as to be able to rotate and raise and lower, an excavation arm is connected to the tip of this support arm so as to be rotatable around a horizontal axis, and a rotary casing is attached to the lower end of this excavation arm. The rotary casing has an excavating pawl and an opening for taking in soil at the lower end of the rotary casing.

[Problem to be solved by the invention]

The first and second conventional devices described above have problems described in A to G below.

A. When excavating trenches of the same depth, in the first conventional device, it is necessary to move the claw-like shovel inside the fixed cover forward along the same horizontal line, but this movement of the fixed cover is done by the movement of the boom and arm. Since the lifting and bending operations are performed, it is necessary to operate at least two operating levers, and this operation is time-consuming and requires skill.

Moreover, there is a possibility that the depth of the grooves may vary.

If this variation occurs, it becomes impossible to form a groove with a flat bottom surface.

In addition, in the second conventional device, when excavating a trench, it is necessary to move the base machine itself forward while excavating, so when moving the base machine, the depth of the excavated surface may be constant due to unevenness of the running surface. There may be cases where this is not the case.

B. In the first conventional device, since the position of the fixed cover relative to the ground surface cannot be changed, the claw-like shovel can only excavate in one direction, and cannot perform rotating excavation. For this reason, when excavating relatively wide trenches,
Since the first conventional device excavates only in the soil direction, the claw-shaped shovel is moved forward to excavate a width corresponding to its outer diameter, and then the cart itself is moved to the side, and the claw-shaped shovel is moved back again. It is necessary to repeatedly excavate the area next to the trench that has already been excavated, which is a time-consuming process.

In addition, although the second conventional device allows turning, the trench excavation is performed by moving the base machine itself back and forth, which takes time and effort. Moreover, if the base machine tilts due to unevenness on the running road surface, the excavation arm will also tilt, and if the cutting bit digs into the ground more than necessary, there is a risk of damage or malfunction.

C. During excavation, in the first conventional device described above, since the claw-like shovel is fixed to the screw conveyor itself, the excavation resistance from the ground acts directly as rotational resistance on the screw conveyor, which causes rotation failure and prevents excavation. There is a possibility that the soil cannot be transported sufficiently. Furthermore, since the outer diameter of the fixed cover is larger than the outer diameter of the rotation locus of the claw-shaped shovel, excessive digging resistance is encountered during excavation.

A gap corresponding to the amount of protrusion of the claw-shaped shovel is created between the outer diameter of the screw conveyor and the inner peripheral surface of the fixed cover. will fall, reducing the transport efficiency of excavated soil. Therefore, the amount of protrusion of the claw-like shovel cannot be made too large, and as a result, the amount of cutting into the ground surface becomes smaller than the amount of protrusion of the claw-like shovel, making it difficult to excavate a large volume. in this case,
If the arm is moved so that the amount of cut into the ground surface becomes larger than the amount of protrusion of the claw-like shovel, the outer peripheral surface of the screw conveyor will come into direct contact with the ground surface. Excessive rotational resistance from the ground may cause malfunction.

In addition, excavated earth and sand are likely to get caught between the inner circumferential surface of the fixed cover and the claw-like shovel, resulting in malfunction and damage.

D. In the drive means for a screw conveyor, the first conventional device rotates the screw conveyor by welding the outer circumferential surface of the screw conveyor and the inner circumferential surface of a rotary tube to each other and rotationally driving the rotary tube. In this case, since the rotary cylinder and the screw conveyor rotate integrally in the same direction, there is a risk that earth and sand will stagnate and clog the rotary cylinder. That is, for transporting earth and sand by a screw conveyor, it is necessary that there be a relative rotation difference between the screw conveyor and the outer cylinder, and it is impossible to transport earth and sand when both rotate together.

E. At the connection part of I number of screw conveyors, the first
In the conventional device, each screw conveyor is connected to each other by a flexible tube, but since the inside of this flexible tube does not have a function of conveying earth and sand, there is a possibility that the inside of this flexible tube becomes clogged with earth and sand. In the second conventional device, the connecting portions are communicated by simply crossing each other,
Since the earth and sand must move horizontally at this intersection, there is a possibility that the earth and sand cannot be transferred sufficiently at this portion. Moreover, since the upper end of the screw conveyor in the excavation arm is placed up to the top end of the intersection, there is a risk that the earth and sand transported upward will be pushed up to the top end and not flow laterally at the intersection. .

F. When excavating in the horizontal direction, in the second conventional device, since multiple openings are formed on the outer peripheral surface, the excavated earth and sand flows out from the openings behind the excavation movement direction, and the excavated soil is There is a risk that soil will be left behind at the bottom, which may lead to a decrease in excavation efficiency. In this regard, in the first conventional apparatus, since a fixed cover is provided at the rear in the direction of excavation movement, there is no problem of missing material, but this fixed cover has the above-mentioned problems such as high movement resistance.

G. When transporting earth and sand using the screw conveyors of the first and second conventional devices, depending on the properties of the earth and sand, water content ratio, etc., earth and sand may adhere to the outer peripheral surface of the screw conveyor and the inner peripheral surface of the casing. Rotational resistance of the conveyor occurs, which may cause malfunction of the screw conveyor. When the above-mentioned malfunction occurs, recovery requires a great deal of effort such as dismantling the outer casing.

This invention was made in view of the above circumstances, and provides an excavation device that can reliably and quickly excavate a trench of a constant depth with a flat bottom surface, and that can be easily operated. is intended to provide.

[Means to solve the problem]

In order to achieve the above object, in claim 1 of this invention,
A base machine, a movable table supported by the base machine so as to be movable back and forth, a support arm supported by the movable table so as to be able to rise and fall and turn, and connected to the tip of the support arm so as to be rotatable around a horizontal axis. an excavation arm connected to a proximal end of the support arm; a conveyor driving means; The screw conveyor is arranged inside one casing so as to be rotatable around the same axis as the rotary casing, and a drive means for this screw conveyor, and the screw conveyor of the excavation arm is connected to the connection part between the excavation arm and the support arm. A communication path for transporting earth and sand from the conveyor to the screw conveyor of the support arm is formed, and an opening for taking in earth and sand is formed at the tip of the rotating casing, and an excavation claw is installed. .

In the second aspect of the present invention, the communication path between the excavation arm and the support arm is formed in the vertical direction so that the support arm side is lower than the excavation arm side.

In a third aspect of the present invention, the earth removal means is constituted by a pair of transfer arms, the first transfer arm is rotatably supported by the base machine at its base end, and the second transfer arm is connected to the first transfer arm. The pair of transfer arms are rotatably supported around a vertical axis at their tips, and each of the pair of transfer arms includes an outer casing, a screw conveyor penetrating the outer casing, and a drive means for the screw conveyor. The base end of the support arm is connected to the support arm at a position below the base end of the support arm so as to communicate with the support arm, and the second
The base end of the transport arm is connected to the first transport arm at a position below the distal end of the first transport arm so as to communicate with the first transport arm.

In claim 4, an outer circumferential cover is attached to the fixed casing so as to face the opening for taking in soil, and the outer circumferential cover is set to be smaller than the front projection plane of the rotation locus of the excavating claw. Configured.

In claim 5, a water guide pipe is wound around the outer periphery of the screw conveyor, a plurality of holes are formed through the water guide pipe along the screw conveyor, and the water guide pipe supplies water to the water guide pipe. Constructed to be connected to a supply source as possible.

[Effect]

According to the structure of claim 1, trenching of a constant depth can be carried out by moving the movable table in the front and back direction with the support arm and the excavating arm fixed at a constant position. In addition, in order to excavate a wide groove, the desired wide groove can be excavated by moving the movable table back and forth and rotating the support arm without moving the base machine.

Furthermore, since the digging claw is formed in the rotating casing, digging resistance from the ground surface does not directly act on the screw conveyor in the digging arm. Since there is always a relative rotation difference between this screw conveyor and each cylindrical body around the outer circumference of this screw conveyor, excavated earth and sand can be reliably conveyed.

According to the structure of claim 2, in the communication path that connects the plurality of screw conveyors to each other, the downstream connecting end (support arm side) in the earth and sand conveyance direction is connected to the upstream connecting end (excavation arm side).
Since the connection is made at a lower level than the above-mentioned connection part, the transfer of earth and sand at the connection part is reliably carried out by the action of gravity.

According to the structure of claim 3, since a pair of screw conveyors are used and their connecting parts are connected such that the screw conveyor on the downstream side is lower, the excavated earth and sand can be transferred to other earth and sand transporters. It can be transported reliably to trucks. Furthermore, since the second transport arm is rotatable, it can be folded up when not in use and can be driven on general roads. Furthermore, since the first transfer arm is also pivotable with respect to the base machine, by rotating the second transfer arm after rotating the first transfer arm, the turning operation of the second transfer arm can be narrowed. It can be done anywhere.

According to the structure of claim 4, since the outer circumferential cover is provided facing the opening for taking in dirt, falling from the opening for taking in dirt is prevented, and the outer circumferential cover is also provided with an opening for digging. Since it is set to be smaller than the front projection plane of the rotation locus, it does not create any resistance when the excavation moves forward.

According to the structure of the claims, since water is discharged onto the transported earth and sand from the water pipe wound around the outer periphery of the screw conveyor, the transported earth and sand is fluidized, and the transported earth and sand is formed on the inner peripheral surface of the cylindrical body. It becomes difficult to adhere.

〔Example〕

In Figure 1, the drilling equipment is a self-propelled base machine 1.
, a movable base 2 supported by the base machine 1 so as to be movable back and forth, and a rotating body 3 rotatably supported by the movable base 2
, a support arm 4 and an excavation arm 5 supported by this revolving body 3, and first and second transfer arms 6.7 supported by the revolving body separately from this pair of arms 4.5. It is structured.

The base machine 1 has a driver's seat 11 in the front and an H seat in the rear.
Guide rails 12 each made of a shaped steel and a spacer are provided, and the movable platform 2 is supported by the guide rails 12 so as to be movable back and forth. As shown in FIG. 2, a pair of support rollers 21 are attached to the lower surface of the four corners of the movable table 2 so as to be rotatable around a horizontal axis a. This support roller 21 has an outer diameter set to be approximately the same as the inner distance between the upper and lower flange portions 121 and 122 of the guide rail 12, and is sandwiched between the upper and lower flange portions 121 and 122 on both sides of the web portion 123. The staff members are placed in a position where they can be transferred to another location.

Further, as shown in FIG. 3, a pair of regulating rollers 22 are attached to the movable table 2 near the support roller 21 so as to be rotatable about a vertical axis bSb' parallel to each other. The pair of regulating rollers 22 are arranged on both sides of the upper flange 121 in the width direction so as to sandwich the upper flange 121 therebetween.

The movement of the movable table 2 is regulated in the vertical direction by the support roller 21 and in the lateral direction by the regulation roller 22, and is moved along the guide rail 12 by a pair of cylinders 23' (see FIG. 4) as shown in FIG. It is moved back and forth between the foremost position shown by a solid line and the last position shown by a chain line.

A revolving body 3 is supported on the upper surface of the movable table 2 so as to be rotatable around a vertical axis C. A cylinder 31 (see FIG. 4) is installed between the revolving body 3 and the movable base 2, and the cylinder 31 allows the revolving body 3 to rotate the base machine 1 around an axis C perpendicular to the movable base 2. Width direction central axis
It is driven to rotate within a range of approximately 30'' on both the left and right sides (the range shown by the arc of a dashed dotted line centered on the vertical axis C in FIG. 4).

The rotating body 3 is composed of a circular base plate 32 and an upper tower 33 erected on the base plate 32, and the base end 4a of the support arm 4 is attached to the upper end of the upper tower 33 around the horizontal axis d. Rotatably mounted.

The support arm 4 includes a cylindrical body 41, a screw conveyor 42 that penetrates inside the cylindrical body 41 and is rotatably supported, and a motor 43 that rotationally drives the screw conveyor 42 (see FIG. 5). It consists of A cylinder 44 is installed between the similar body 41 of the support arm 4 and the upper tower 33, and the cylinder 44 allows the support arm 4 to be moved up and down relative to the rotating body 3.

A proximal end 5a of an excavation arm 5 is disposed at the distal end 4b of the support arm 4 in such a manner that it intersects with the support arm 4, and is supported rotatably around a horizontal axis e via an inclined bracket 46. . A cylinder 47 is connected to a pair of link rods 48 between the excavation arm 5 and the support arm 4.
, 49, and the excavating arm 5 is rotated relative to the support arm 4 around the horizontal axis e by this cylinder 47.

As shown in FIG. 5, the excavation arm 5 includes a fixed casing 51, a rotating casing 52 that is rotatably supported around the same axis by the rotating casing 51 on the inner peripheral side of the lower part of the fixed casing 51, and 52
drive motor 53 and these pair of casings 51.5
2 (see FIG. 6) and a drive motor 55 for this screw conveyor 54.
It is constructed from this.

As shown in FIG. 5, a gear 520 is formed around the upper end of the rotating casing 52, and this gear 520
and the gear 531 of the drive motor 53 are meshed with each other. The rotating casing 52 is rotated by this drive motor 53.
are rotated in opposite directions to the screw conveyor 54. A lower end portion 521 of the rotating casing 52 is arranged to protrude from the lower end of the fixed casing 51, and this lower end portion 521 is open downward, and has three earth and sand intake holes on its circumferential surface as shown in FIG. An opening 522 is formed in the circumferential direction.

A cover 523 for adjusting the opening is provided on the inner edge of the opening 522.
and an excavating claw 524 are each removably attached. A blower-shaped tip claw 525 is fixed to the lower end surface of the rotating casing 52. Further, an outer peripheral cover 51 is provided at the lower end of the fixed casing 51 as shown in FIG.
1 is attached to the rotary casing 52, and this outer peripheral cover 511 hangs down almost to the lower end of the rotating casing 52. As shown in FIG. 7, this outer cover 511 is bent so as to have an inner diameter slightly larger than the rotation locus of the tip of the digging claw 524, and its width is in the horizontal excavation direction (see the solid line arrow in FIG. 7). The projected width Dc is set to be smaller than the diameter Dn of the rotation locus of the tip of the digging claw 524.

As shown in FIG. 6, the screw conveyor 54 is rotatably supported around an axis by the upper end of the fixed casing 51 and the center of the tip claw 525. A sprocket 541 attached to the upper end of the screw conveyor 54 and a sprocket 551 attached to the output shaft of the drive motor 55 are connected to each other by a chain 545.
is driven in rotation.

Further, a water injection hole 546 is formed through the upper end of the screw conveyor 54 along its central axis. This water injection hole 546 opens at an appropriate position on the side surface of the screw conveyor 54, and a copper hose (water conduit) 547 communicating with this water injection hole 546 is wound around the outer periphery of the screw conveyor 54.

A large number of through holes (not shown) are formed in the hose 547 along the screw conveyor 54, and a water supply source (not shown) is connected to the water injection hole 546. By pouring water into the water injection hole 546,
Water is sprayed around the screw conveyor 54 from the through hole of the hose 547.

The inclined bracket 46 consists of a pair of divided pieces 46a and 46b, as shown in FIG. They are fixed in communication with the shaped body 41, respectively. The divided pieces 46a and 46b have a sliding surface 461 formed obliquely to a sliding plate 462 formed of Oiles metal or the like (for example, the angle formed with the rotating surface of the excavation arm is 30 inches or less). The pair of sliding plates 462 are slidably brought into close contact with each other, so that the pair of communicating tubes 463 are connected in a state where they communicate with each other, and the pair of sliding plates 462 are rotated relative to each other around the horizontal axis e by sliding each other.

Further, as shown in FIG. 6, the screw conveyor 54 of the excavation arm 5 is arranged such that the upper end 542 of its screw blade is located approximately at the middle stage in the vertical direction of the opening 513 to the communication path 463 of the inclined bracket 1/46. ing. An inclined plate 512 is formed at the inner upper end of the fixed casing 51 so as to face the communication path 463 of the inclined brackets 1 and 46.

On the other hand, the base end portion of the first transfer arm 6 is rotatably attached to the rotating body 3 around the vertical axis C, as shown in FIG.
As a result, the first transfer arm 6 is supported in a cantilevered manner in a state of protruding diagonally upward to the front.

A cylinder 6 is provided between the rotating body 3 and the first transfer arm 6.
0 is attached, and by means of this cylinder 60, the rotating body 3 can rotate independently of the rotating body 3 in the range shown by the three-dot chain line in FIG. 4 around the vertical support C.

Further, as shown in FIG. 1, the base end of a second transport arm 7 is attached to the distal end of the first transport arm 6 so as to be rotatable around a vertical axis f, as shown in FIG. The second transport arm 7 is supported horizontally in a cantilevered manner. A cylinder 6 is provided between the first and second transfer arms 6 and 7.
7 is attached, and the second transfer arm 7 is driven by this cylinder 67 to rotate around the vertical axis f in the range shown by the dashed line in FIG.

The first and second transport arms 6, 7 are cylindrical bodies 61.
71, a screw conveyor (not shown) disposed through the cylindrical body 61, 71, and motors 62, 72 for rotationally driving the screw conveyor.

The cylindrical body 61 at the base end of the 1111th sending arm 6 has a first
As shown in the figure, a hopper 611 that opens upward is formed, and a discharge port 411 that opens downward is formed at the base end of the cylindrical body 41 of the support arm 4. The bellows-like hose 422 connects to the hopper 6.
It is inserted in 11. In addition, the first transfer arm 6 and the second
A communication path 68 is formed at the connection portion with the transport arm 7 to communicate the lower surface of the distal end of the first transport arm 6 and the upper surface of the proximal end of the second transport arm 7 with each other. Furthermore, a discharge port 711 that opens downward is formed at the tip of the second transfer arm 7.

1 and 4, 13 indicates an outrigger, 14 indicates a hydraulic pump, 15 indicates a hydraulic oil tank, 16 indicates an operator seat, and 17 indicates an oil cooler.

In the excavating apparatus having the above configuration, when traveling on a general road, the second conveying arm 7 is rotated around the vertical axis f and folded backward by operating the cylinder 67, as shown in FIG. Then, the digging arm 5 and the support arm 4 are folded as shown by solid lines in FIG. To fold these, first, from the state shown by the two-dot chain line in FIG. The excavator arm 5 is brought down together with the excavator arm 5 to make the excavator arm 5 horizontal (see the state indicated by the one-dot chain line in FIG. 8). In this state, by operating the cylinder 23 (see Figure 4), the movable platform 2 is moved to the foremost position from the driver's seat 11 (No. 8
(See the state indicated by the solid line in the figure). Finally, by contracting the outriggers 13, the storage state can be achieved.

In this state, the four arms 4, 5, 6.7 are within the range of approximately the length of the base machine 1 in the longitudinal direction, and the base machine 1 can run on general roads without any trouble.

Next, a method of excavating a trench using the excavation device of the above embodiment will be explained. First, the base machine 1 is stopped at a predetermined position and fixed in position by the outriggers 13. Then, in the reverse order of the folding procedure described above, with the movable platform 2 positioned at the rearmost position, the excavation arm 5 is made vertical as shown by the one-dot chain line in FIG. Position near the surface. Further, the second transfer arm 7 is rotated around the vertical axis f, and the discharge port 711 is arranged so as to face the loading platform of the truck T for transporting earth and sand placed in front of the base machine 1. Then, all the screw conveyors 42, 54 are driven to rotate, and the preliminary preparations for the excavation work are completed.

The rotating casing 52 is rotated by the drive of the motor 53, and the cylinder 44 is contracted to excavate to a depth corresponding to the excavating claw 524 (see the two-dot chain line in FIG. 1).

At this time, the excavation arm 5 may be vertically corrected by adjusting the cylinder 47 to expand or contract.

Next, the cylinder 23 is operated to move the moving table 2 from the rearmost position to the frontmost position. As a result, the digging claw 524
Surrounded by one groove with a depth corresponding to the height of trenches can be excavated. Thereafter, by rotating the rotating body 3 around the vertical axis C, the excavation arm 5 is moved from the position shown by the one-dot chain line in FIG. do. By moving the moving table 2 from this position to the last position again,
It is possible to excavate a groove that is adjacent to and parallel to the already excavated groove, that is, a groove that is surrounded by the excavating arm 5 indicated by the two-dot chain line and the excavating arm 5 indicated by the three-dot chain line in FIG. Thereafter, by repeating the rotation of the rotating body 3 and the movement of the movable base 2 in the same manner until the groove to be excavated is reached, the digging claw 52
A relatively shallow trench with a predetermined trench width and a depth corresponding to the height of 4 can be excavated.

Assuming that the above-mentioned excavation is one cycle, by repeating two cycles, it is possible to excavate a groove with a depth equivalent to twice the height of the excavation claw 524, and this is repeated until the planned groove depth is reached. All you have to do is return it (see the state shown by the three-dot chain line in Figure 1).

The earth and sand in the excavation described above is first conveyed upward by the screw conveyor 54 of the excavation arm 5, hits the inclined plate 512 at its upper end, and its direction is changed to the communication path 463 side of the inclined bracket 46, and this communication path 463 It passes through the inside and falls onto the screw conveyor 42 of the support arm 4. At this time, the screw conveyor 5 of the excavation arm 5
4, the upper end 542 of the screw blade is connected to the communication passage 46.
3, the flow path of the conveyed earth and sand can be smoothly changed into the inclined bracket 46 without being excessively compressed with the inclined plate 512.

The earth and sand conveyed to the base end 4a by the screw conveyor 42 of the support arm 4 is discharged through the discharge port 411,
It is dropped onto the screw conveyor of the first transfer arm 6 through the bellows hose 422 and the hopper 611.

The earth and sand carried forward by this screw conveyor is dropped onto the screw conveyor of the second conveyor arm 7 through the communication path 68, and the earth and sand conveyed to the tip by this screw conveyor is sent from the discharge port 711 to the earth and sand transport truck T. will be put into the In this way, each arm 4, 5,
The screw conveyors 54 and 42 in 6.7 are connected so that the downstream connecting end of the earth and sand conveying channel formed by them is always lower than the upstream connecting end. This allows for smooth transport without soil clogging.

In the excavation apparatus of this embodiment, trenches are excavated by moving the movable platform 2 forward with the excavation arm 5 fixed in position, as shown by the dashed line and solid line in FIG.
It is possible to reliably excavate trenches with a uniform depth and a flat bottom surface. Moreover, since it is only necessary to move the moving table 2 in the front and rear directions, the operation is easy and can be carried out reliably. Furthermore, since it is not necessary to move the base machine 1 at the same time, the operation can be performed by one operator.

In the above-mentioned excavation, since this excavation is performed by the excavation claw 524 provided on the rotary casing 52, excavation resistance does not directly act on the screw conveyor 54, and this screw conveyor 54 is operated reliably. be able to.

and an opening 52 in the lower end 521 of the rotating casing 52.
Since the screw conveyor 54 and the rotary casing 52 rotate in opposite directions, the earth and sand taken in from the rotary casing 2 are efficiently conveyed upward by the screw conveyor 54. When trench excavation is performed by the forward movement of the movable table 2, an outer circumferential cover 51 is placed behind the movable table 2 in the moving direction.
1, the earth and sand taken into the screw conveyor 54 can be prevented from spilling out from the opening 522, so that it is possible to reliably prevent the excavated earth and sand from falling into the already excavated trench.

Further, since the outer circumferential cover 511 is smaller than the outer diameter Dn of the rotation locus of the excavating claw 624, no resistance is generated during forward excavation by the forward movement of the movable table 2. Furthermore, since the digging pawl 524 is provided on the rotating casing 52, there is no restriction on the amount of protrusion of this pawl 524 as in the first conventional device, and the excavating pawl 524 can be replaced depending on the properties of the ground. The amount of protrusion can be changed. This makes it possible to speed up excavation and improve excavation efficiency.

Furthermore, if transported soil adheres between the screw conveyor 54 and the rotating casing 52 or fixed casing 51 due to the properties of the excavated ground, the water injection hole 546
Just pour water into it. As a result, water is discharged from the many through-holes of the hose 547 onto the transported earth and sand, increasing its water content. Therefore, the adhesion of the earth and sand can be reliably prevented.

Note that muddy water is generated in each arm 4, 5, 6, 7 due to water spraying, but each arm 4, 5, 6, 7 is almost sealed up to the truck T for transporting earth and sand, so there is no muddy water around the excavation site. will not damage the environment.

Note that when the second transfer arm 7 rotates, there may be cases where there is not enough space on the side of the base machine 1 to correspond to the length of the second transfer arm 7. In this case, the first transfer arm 6 is first rotated from the folded state of the second transfer arm 7 to the maximum pivot point p (see FIG. 4) about the vertical axis C. As a result, the rotation axis f of the second transfer arm 7 also moves to the above point p.
Move to. Then, the second transfer arm 7 is centered around this point p.
It is only necessary to turn it as shown by the two-dot chain arrow in FIG. Thereby, the second transfer arm 7 can be rotated even in a relatively narrow space.

Note that the drilling device of the present invention can be used for example for powdery materials such as grains,
It may also be used for the work of taking in granular materials.

〔Effect of the invention〕

According to the excavation device according to claim 1 of the present invention, it is possible to reliably and quickly excavate a groove of a constant depth having a flat bottom surface. The operation can be easily performed by simply moving the movable table in the front and rear directions. Furthermore, when excavating wide trenches, by moving the moving table back and forth and rotating the support arm, it is possible to reliably and quickly excavate a trench of a constant depth with a flat bottom surface without moving the base machine. and can be easily operated.

Since the digging claw is formed in the rotating casing, the digging resistance from the ground surface does not directly act on the screw conveyor of the digging arm, and the screw conveyor and each cylindrical body around the screw conveyor. Since there is always a relative rotation difference between the two, excavated earth and sand can be transported reliably.

According to the structure of claim 2, since the communication passages that connect the plurality of screw conveyors to each other are connected such that the connecting end on the downstream side in the earth and sand transport direction is lower than the connecting end on the upstream side, The earth and sand can be reliably delivered at the connecting portion, and the conveyance performance can be improved.

According to the structure of claim 3, the excavated earth and sand can be reliably transported to other earth and sand transportation trucks. Furthermore, since the second transport arm is rotatable, it can be folded up when not in use and can be driven on general roads. Furthermore, since the first transfer arm is also pivotable with respect to the base machine, by rotating the second transfer arm after rotating the first transfer arm, the turning operation of the second transfer arm can be narrowed. It can be done anywhere.

According to the fourth aspect of the present invention, the outer circumferential cover prevents the soil from falling from the opening for taking in the soil, and it is possible to prevent the excavated soil from falling into the excavated trench. However, the existence of this outer circumferential cover does not interfere with the progress of excavation; according to the structure of claim 5, water is discharged from the water conduit pipe wound around the outer circumference of the screw conveyor to the transported earth and sand. By doing so, it is possible to reliably prevent the transported earth and sand from adhering to the inner circumferential surface of the cylindrical body, and thereby the earth and sand can be transported more reliably by the screw conveyor. Moreover, it is possible to prevent environmental deterioration of the construction site due to the water.

[Brief Description of the Drawings] Fig. 1 is an explanatory side view showing an embodiment of the present invention, Fig. 2 is an explanatory sectional view taken along the line Partially omitted cross-sectional explanatory diagram along ■-■ line, 4th
The figure is an explanatory plan view of the embodiment shown in Fig. 1, Fig. 5 is an explanatory side view showing an enlarged view of the support arm and the excavation arm, and Fig. 6 is a partially modified cross section taken along the line Vl-Vl in Fig. 5. 7 is an enlarged cross-sectional view taken along line 1 and 2 in FIG. 5, FIG. 8 is a side view showing the condition when driving on a general road, and FIG. 9 is a plan view showing the state of excavation. It is a diagram. DESCRIPTION OF SYMBOLS 1...Base machine, 2...Moving table, 4...Support arm, 5...Drilling arm, 6...1st transfer arm, 7...28th feed arm, 41... Cylindrical body, 42・
...Screw conveyor, 43...Drive motor, 51
... Fixed casing, 52 ... Rotating casing, 5
3... Drive motor for rotating casing, 54... Screw conveyor, 55... Drive motor for screw conveyor, 61... Outer casing, 62... Drive motor, 71... Outer casing, 72... ... Drive motor, 511 ... Outer cover 522 ... Opening, 5
24... Excavation claw, 542... Upper end of screw blade, 546... Water injection hole, 547... Hose.

Claims (1)

[Claims] 1. A base machine, a movable table supported by the base machine so as to be movable back and forth, a support arm supported by the movable table so as to be movable and rotatable, and a distal end of the support arm. It has an excavation arm rotatably connected around a horizontal axis, and an earth removal means connected to a base end of the support arm, the support arm having a cylindrical body and disposed inside the cylindrical body. The excavation arm includes a cylindrical fixed casing, and a cylindrical member disposed coaxially with the fixed casing and rotatably connected to the fixed casing. A rotary casing, a screw conveyor disposed inside the two casings so as to be rotatable about the same axis as the rotary casing, and a driving means for the screw conveyor, and a connection between the excavation arm and the support arm. A communication path for transferring earth and sand from the screw conveyor of the excavation arm to the screw conveyor of the support arm is formed in the rotary casing, and an opening for taking in earth and sand is formed at the tip of the rotary casing, and an excavation claw is attached. Drilling equipment characterized by: 2. The excavation device according to claim 1, wherein the communication path between the excavation arm and the support arm is formed in the vertical direction so that the support arm side is lower than the excavation arm side. 3. The earth removal means is constituted by a pair of transfer arms, the base end of the first transfer arm is rotatably supported by the base machine, and the second transfer arm is attached to the tip of the first transfer arm. The pair of transfer arms are rotatably supported around a vertical axis, and each of the pair of transfer arms includes an outer casing, a screw conveyor penetrating the outer casing, and a drive means for the screw conveyor. is connected to the support arm at a position below the base end of the support arm so as to communicate with the support arm, and the base end of the second transport arm is connected to the first transport arm at a position below the distal end of the first transport arm. The excavation device according to claim 1 or 2, wherein the excavation device is connected to the transfer arm so as to communicate with each other. 4. An outer circumferential cover is attached to the fixed casing so as to face the opening for taking in soil, and this outer circumferential cover is set to be smaller than the front projection plane of the rotation locus of the excavating claw. The drilling equipment according to claim 1, claim 2, or claim 3. 5. A water guide pipe is wound around the outer circumference of the screw conveyor, and a plurality of holes are formed in this water guide pipe to penetrate along the screw conveyor, and the water guide pipe is capable of supplying water to this water guide pipe. 5. The drilling rig according to claim 1, 2, 3, or 4, wherein the drilling rig is connected to a power source.