JP3564670B2 - Repair drilling type multi-axis drilling machine - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a multi-shaft excavator in which a plurality of excavating working shafts each having a working blade such as a stirring blade on an outer periphery of a shaft and a drilling head at a lower end of the shaft are connected in parallel to each other and connected to a rotary drive unit. In the repair excavation type multi-axial excavation work, in which the wedge-shaped remaining portion generated between circular vertical holes that are dug adjacent to each other or partially overlapped by each excavation operation axis is also simultaneously excavated to excavate a continuous long hole About the machine.
[0002]
[Prior art]
Conventionally, as a repair excavation type multi-shaft excavator / stirrer, two excavation / stirring spindles having an excavating head at the lower end of the shaft and stirring blades at the outer periphery of the shaft are connected in parallel to a rotary drive unit and suspended therefrom. On both sides of a line (parallel line) connecting the two, a sub shaft is supported rotatably horizontally, and a repair digging blade for excavating a wedge-shaped digging portion is protruded on the outer periphery of the sub shaft. A structure is known in which rotation is transmitted to the countershaft from the main shaft via a worm and a worm wheel.
[0003]
By the way, in general, when digging into the ground with a plurality of digging and stirring spindles and excavating the remaining digging portion with a digging blade for repair, the digging and stirring spindle is liable to collapse, for example, a normal ground such as a clay layer and a sand layer, a gravel layer and the like. In all of the ground, it is rotated at a substantially constant speed to perform effective excavation and agitation.However, the drilling fins for repair are usually rotated at a high speed for the remaining part of the ground, and digging in the collapsed ground. It is desirable to rotate the remaining portion at a low speed to prevent collapse.
[0004]
However, in the above-mentioned conventional machine, the repair digging blade cannot change the rotation speed independently of the digging agitating spindle, so that the repair digging cannot be performed according to the properties of the ground as described above. As a result, there is a defect that the rotation speed is insufficient in the excavation of the unexcavated portion on the ordinary ground and sufficient excavation cannot be performed, and the excavation of the unexcavated portion on the collapsible ground causes a large collapse of the portion.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to appropriately excavate an unexcavated portion by changing the rotation speed of a repairing excavation blade according to the properties of the ground.
[0006]
[Means for Solving the Problems]
As means for solving the above problems, the present invention provides:
A plurality of excavating work spindles each having a work blade on the outer periphery of the shaft and a drilling head at the lower end of the shaft are connected to the rotation drive unit supported by the support material so as to be able to freely move up and down so as to be able to transmit rotation in a side-by-side state and droop. Multi-axis excavator
A support ring is rotatably fitted to a lower portion of each of the above-mentioned excavation work spindles, and a holder is supported by an adjacent support ring,
The holder, on both sides of each of the excavation work spindle parallel lines, rotatably support a repair excavation sub-shaft having a repair excavation blade protruding at a position corresponding to the wedge-shaped remaining part,
Each of the repair excavation sub-axes was connected to a variable-speed motor mounted on the holder,
A repair excavation type multi-axis excavator is proposed.
[0007]
The "working blade" of the above-mentioned excavation working spindle in the present invention is a propeller-shaped blade, a stirring blade such as a spiral blade for one rotation, a conveying blade such as a continuous spiral blade, a drilling blade such as a blade having a bit, and a cutting blade of these blades. Includes composite blades with multiple types.
[0008]
Further, propeller-shaped blades, double-helical blades, and other variously structured blades are selectively used as appropriate for the “repair drilling blades”.
Further, the “motor” may be a hydraulic motor or an electric motor.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
【Example】
In FIGS. 1 (a) and 1 (b), the lower end of a leader mast (2) is connected to the front end of the base machine (1) as a support material, and is vertically supported. A rotary drive unit (4) having a motor and a reduction gear is slidably engaged with the laid guide rails (3) and (3) via slide fittings (5)... And a top sheave block (6). Supported by a wire (7) hanging down from the shaft, a stirring blade (9) at the lower part of the output shaft of the rotary drive part (4) and a drilling head (10) at the lower end. The main shafts (8) are connected to each other at the upper end of the main shafts via a rotation transmission gear train in a left-right parallel state, and the excavation head is repaired and excavated at a position slightly above the excavation head (10) of each stirring main shaft (8). The device (A) is mounted.
[0010]
The structure of the repair excavator (A) is as follows. 2 and 3, a support ring (12) is rotatably fitted between a pair of upper and lower flanges (11) (11) of the main shaft (8) through a bush (13). A pair of short arms (14), (14),... Protrude from adjacent sides of each ring between adjacent rings (12), (12), (12), (12) among these support rings, The holders (15) and (15) are supported by these two sets of adjacent arms (14) (14), (14) (14) and (14) (14), (14) (14), respectively.
As shown in FIG. 3, the holders (15) and (15) are arranged such that the bearing cylinders (17) and (17) having the opening at the tip from both end surfaces of the cylindrical upper case (16) in which the motor is to be housed are arranged on the same axis. These holders (15), (15) are arranged on the same horizontal plane with respect to a parallel line (l) of the respective spindles (8), that is, a line connecting the centers of the respective spindles (8). The bearing tubes (17), (17) on both end surfaces are orthogonal to each other and are positioned so as to protrude to both sides of the parallel line.
[0011]
In the present embodiment, as the motor, variable-speed hydraulic motors (18) and (18) having output shafts (19) and (19) projecting from both ends are provided in the cases (16) and (16). (19) and (19) are housed in a state where they are viewed in the bearing cylinders (17) and (17).
[0012]
The repair excavation sub-shaft (20) has an inner shaft (22) having an outer diameter smaller than the inner diameter and longer than the inner diameter fixed concentrically at one end in a hollow outer shaft (21), and another shaft between the two shafts. An annular groove (22 ') having an open end is formed, and a drilling blade (23) for repair is protrudingly provided on the outer peripheral surface of the outer shaft (21) in a propeller shape. On both sides of the parallel line (l), the inner shafts (22) are rotatably inserted into the bearing sleeves (17) of the holders (15), (15) to freely rotate the hydraulic motors (18), (18). ) Are connected to the output shafts (19), respectively, and the bearing sleeves (17) are inserted into the annular grooves (22 '), and the outer shafts (21) are rotated on the outer peripheral surface thereof. They are freely supported.
[0013]
(24) and (24) are pressure oil supply pipes to the hydraulic motors (18) and (18), and (25) and (25) are chemical liquid supply pipes of a solidifying agent or the like along the main shaft (8). , And in the middle thereof, are held by support plates (27), (27) supported by support rings (26) rotatably fitted to the main shafts (8). (28) is a chemical solution discharge nozzle.
[0014]
The operation of the above example will now be described. When the rotation drive unit (4) is started, the three excavating and stirring main shafts (8) are rotated in the directions of the arrows in FIG. 2A, respectively. When the ground is a clay layer, the hydraulic motors (18), ( 18) is started at a high rotation speed, and each excavation sub-shaft (20) is rotated at a high speed to start excavation on the ground. Then, the excavation heads (10) of the respective main shafts (8) are adjacent to each other in circular shapes. The vertical hole is pre-drilled, and then the excavated earth mass is crushed and stirred by the repairing drilling blade (23), and further stirred by the stirring blade (9), and remains together with the three circular vertical holes. The two pairs of wedge-shaped excavated portions are sufficiently excavated with the respective repairing excavating blades (23)... Thereby forming a continuous hole having no excavated portions.
[0015]
When the ground is sandy or gravel layer, the main shaft (8) is rotated at almost the same speed as in the above example, but the repair excavation sub-shaft (20) is set at a low rotational speed with hydraulic motors (18) and (18). When the ground is excavated by switching and rotating at a low speed, the wedge-shaped remaining part is excavated with a low-speed rotating repairing excavation blade (23). To form
[0016]
In another embodiment, the repair excavator (A) in the above example may be provided in a plurality of stages above and below to increase the excavation stirring efficiency.
[0017]
【The invention's effect】
Since the repair excavation type multi-axis excavator of the present invention is provided with a variable rotation speed motor dedicated to the repair excavation sub-shaft, the properties of the ground to be excavated may be normal ground such as clay layer, or sand layer, gravel layer, etc. The number of rotations of the repair excavation sub-axis is changed according to whether it is buried ground, so that the unexcavated part can be sufficiently excavated in normal ground, and the collapse of the unexcavated part can be excavated in collapsible ground with minimal collapse In addition, the holder is supported by a support ring rotatably fitted to a plurality of excavating operation shafts, and the holder is provided with a rotatable support of an auxiliary excavation auxiliary shaft and a dedicated motor. The shaft and the dedicated motor can be stably supported.
[Brief description of the drawings]
FIG. 1A is a front view of a multi-shaft excavator and stirrer with a repair excavator.
(B) FIG.
FIG. 2 (a) is an enlarged front view of a repair digging device part.
(B) It is an enlarged side view of the same.
FIG. 3 is an enlarged sectional view taken along line III-III of FIG.
[Explanation of symbols]
2 Leader mast 4 Rotary drive unit 8 Drilling and stirring main shaft 9 Stirring blade 10 Drilling head 12 Support ring 15 Holder 18 Variable rotation speed hydraulic cylinder 20 Repair drilling counter shaft l Parallel line

Claims (1)

A plurality of excavating work spindles each having a work blade on the outer periphery of the shaft and a drilling head at the lower end of the shaft are connected to the rotation drive unit supported by the support material so as to be able to freely move up and down so as to be able to transmit rotation in a side-by-side state and droop. Multi-axis excavator
A support ring is rotatably fitted to a lower portion of each of the above-mentioned excavation work spindles, and a holder is supported by an adjacent support ring,
On the holder, on both sides of each of the excavation work spindle parallel lines, a repair excavation sub-shaft having a repair excavation blade protruding at a position corresponding to a wedge-shaped excavation remaining portion is rotatably supported,
Each of the repair excavation sub-axes was connected to a variable-speed motor mounted on the holder,
Repair drilling type multi-axis drilling machine.

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