JP2017190640A - Rotary excavator capable of controlling pressing force on pit face - Google Patents

Abstract

An object of the present invention is to provide a rotary excavator with a face pressing force control type capable of appropriately controlling the pressing force on the face of the excavator with a simple structure. [Solution] An excavator main body equipped with a rotationally driven cutter head, a front shell connected to the excavator main body, and a plurality of directional control jacks arranged on the front shell to control the excavation direction of the excavator main body. a thrust point jack disposed on the front body that applies a face pressing force to the cutter head; and a control device that controls the face pressing force of the cutter head by the thrust point jack to a face pressing force corresponding to the face soil pressure and the face soil conditions. It is characterized by comprising the following. [Selection diagram] Figure 2

Description

  The present invention relates to a rotary excavator that forms a cylindrical hole in the ground, and more particularly to a face pressing pressure control rotary excavator capable of appropriately controlling the pressing force to the face of the excavator.

  An excavator that excavates natural ground to form a tunnel hole is configured by connecting an excavator main body having a cutter head at the tip and a front trunk by a plurality of direction control jacks. The excavator is propelled along a planned line by a propulsive force applied by a main push jack disposed at the rearmost end of a propulsion pipe row connected to the rear end of the rear barrel by rotating the cutter head.

  When the driving direction of the excavator deviates from the planned line while excavating the natural ground, the direction is corrected by operating the direction control jack to relatively bend the excavator body and the front trunk. For this reason, in order to maintain the exact precision along a plan line, it is necessary to always move a plurality of direction control jacks.

JP-A-9-189194

  In the propulsion work by the excavator, the propulsion pipe row itself is an elastic body, and when the cushion material of each joint is added, the propulsion pipe row shrinks against the propulsive force of the main push jack and a part of the propulsive force is absorbed. Since the thrust resistance of the tube row itself varies depending on the surrounding ground, the magnitude of the pressing force of the cutter head of the excavator on the face is unknown and becomes unstable.

  If the ground pressure is low relative to the face pressure, and the ground pressure is low with respect to the face pressure, the surrounding earth will collapse into the chamber and flow into the chamber, causing voids in the outer ground. Causes problems such as land subsidence. On the other hand, when the pressing force of the cutter head is higher than the face soil pressure, ground uplift and excavation load increase, and excavation becomes impossible.

Furthermore, in the ground containing cobblestones and boulders, if the pressing force is low, the cobblestones and boulders are swung by the bit installed on the front of the cutter head. Since there is no reaction force, crushing of cobblestones and the like becomes impossible. In the case of a hard rock mass, if the pressing force is high, the bit arranged in the cutter head bites into the rock mass and cannot be excavated efficiently.

In order to solve this problem, a single pressing force for pressing the excavator against the face and a device for measuring the pressing force and applying an optimum pressing force are required.

  As a countermeasure, a method of pressing the cutter head of the excavator main body against the face with a direction control jack has been proposed, but the direction control jack that always requires correction of the direction of the excavator is continued during excavation. It is difficult to serve as an excavator pressing force management device.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a face pressing force control type rotary excavator capable of appropriately controlling the pressing force to the face of the excavator with a simple structure. .

  In order to solve the above-mentioned problems, the face pressing force control rotary excavator of the present invention is disposed in an excavator main body equipped with a cutter head that is rotationally driven, a front cylinder coupled to the excavator main body, and a front cylinder. Multiple direction control jacks that control the direction of excavation of the excavator body, a thrust point jack that is placed on the front cylinder and applies a face pressing force to the cutter head, and the face pressure of the cutter head by the thrust point jack And a control device for controlling the face pressing force corresponding to the face soil condition.

  Moreover, the face pressing force control rotary excavator of the present invention is characterized in that the control device controls the face pressing force of the cutter head based on a hydraulic value added to the thrust point jack.

The main body of the excavator equipped with a cutter head that is driven to rotate, the earth pressure sensor that is arranged on the main body of the excavator and measures the face soil pressure, the front trunk that is connected to the main body of the excavator, and the main body of the excavator that is arranged on the front trunk A plurality of directional control jacks for controlling the digging direction, and a control device for controlling the face pressing pressure of the cutter head by the thrust point jack to the face pressing pressure corresponding to the face pressure and face condition, The cutter head can be pressed with a dedicated thrust point jack, so it is possible to excavate the blade with the appropriate pressing pressure according to the cutting pressure, water pressure and cutting conditions, and safe and efficient propulsion is possible. Construction is possible. In addition, cobblestone and boulder ground can be crushed while holding cobblestone and boulder with certainty by appropriate face pressing pressure.
The control device controls the cutter face pressing force based on the hydraulic pressure value applied to the thrust point jack, so that the cutter head pressing force can be easily measured and controlled.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

  An embodiment of a face pressing force control rotary excavator 1 according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a state of underground excavation by the face pressing force control rotary excavator 1 of the present invention.

  The starting shaft 2 and the reaching shaft 3 are excavated in the ground. The excavation is started from the starting shaft 2 by the rotary pressing machine 1 with the face pressure control. The face pressing force control rotary excavator 1 includes an excavator main body 4 having a cutter head 7 disposed at the tip, a front cylinder 5 connected to the excavator main body 4, and a rear cylinder 6 connected to the front cylinder. .

  When the excavation by the rotary pressing machine 1 with the face pressing force control proceeds, the new pipe 9 is pushed in and connected to the rear trunk 6 by the main push jack 8 arranged in the start shaft 2. By repeating this work, the new pipe 9 is laid down to the reach shaft 3.

Details of the face pressing force control rotary excavator 1 will be described with reference to FIGS. 2, 3, and 4. A cutter head 7 is rotatably disposed at the tip of the excavator main body 4. As shown in FIG. 3, the cutter head 7 is provided with a center-to-cone bit 10, an auxiliary roller bit 11, a gauge cutter 12, a face roller bit 13, and the like.

  A front barrel 5 is connected to the excavator main body 1 so as to be rotatable by a predetermined angle. A partition wall 14 is installed at the rear of the excavator main body 1 and is partitioned from the front barrel 5. The excavator body 1 is provided with face layer sampling means for determining the face soil quality. The sample obtained by the face soil sampling means is collected by opening the door provided on the partition wall 14.

  An electric motor 15 that rotationally drives the cutter head 7 is disposed on the front barrel 5, and an output shaft of the electric motor 15 is connected to the cutter head 7 via a speed reducer 16 and a universal joint 17, and the cutter head 7 is rotationally driven. Is done.

  A direction control jack 18 that controls the direction of the excavator main body 1 is disposed at the front of the front barrel 5, and a dedicated thrust point jack 19 that presses the cutter head 7 against the face surface is disposed at the rear of the front barrel 5. Be placed. The thrust point jack 19 will be described later. The front barrel 5 is provided with a crusher feeder 20 that transports the earth and sand excavated by the cutter head 7 of the excavator body 4, a mud pipe, a water pipe, and the like, and the partition wall 14 of the excavator body 1 communicates with them. An opening is formed. An earth pressure sensor 21 for measuring the earth pressure on the face is disposed on the partition wall 14.

  A rear cylinder 6 is connected to the front cylinder 5. A hydraulic pump 22 and an in-machine control device 23 are disposed on the rear trunk 6. The direction control jack 18 and the thrust point jack 19 are driven by the hydraulic pressure from the hydraulic pump 22. The in-machine control device 23 controls various parameters of the face pressing force control rotary excavator 1. Here, control of the thrust point jack 19 will be described.

  The thrust point jack 19 is supplied with hydraulic pressure from the hydraulic pump 22 via a control valve and a hydraulic gauge. The oil pressure value supplied to the thrust point jack 19 by the oil pressure gauge is transmitted to the in-machine controller 23. In addition, the measurement data of the face surface earth pressure from the earth pressure sensor 21 that measures the face surface earth pressure is also transmitted to the in-machine controller 23. In addition, the in-flight control device 23 is also input with data on the face soil quality obtained by the face soil sampling means.

  When excavating the face by rotating the cutter head 7, the in-flight control device 23 generates the face pressing pressure by the thrust point jack 19 based on the face face earth pressure data from the earth pressure sensor 21 and the face soil data. The control valve is controlled to determine the hydraulic pressure value to be supplied to the thrust point jack 19 corresponding to the determined face pressing force.

  As described above, according to the face pressing force control rotary excavator 1 of the present invention, the face pressing force of the cutter head can be implemented by the dedicated thrust point jack 19, so that it corresponds to the face surface soil pressure, water pressure and face soil condition. Therefore, the face can be excavated with an appropriate face pressing force, and safe and efficient propulsion can be performed. In addition, cobblestone and boulder ground can be crushed while holding cobblestone and boulder with certainty by appropriate face pressing pressure. Further, in the outer peripheral drive type excavator, the face pressing force by the thrust point jack can be ascertained, so that it is possible to prevent an overload of the bearing, which is a key part of the rotary drive unit.

  1: face pressing pressure control rotary excavator, 2: start shaft, 3: reaching shaft, 4: excavator body, 5: front barrel, 6: rear barrel, 7: cutter head, 8: former push jack, 9: newly established Tube: 10: Center to cone bit, 11: Auxiliary roller bit, 12: Gauge cutter, 13: Face roller bit, 14: Bulkhead, 15: Electric motor, 16: Reducer, 17: Universal joint, 18: Direction control jack , 19: thrust point jack, 20: crusher feeder, 21: earth pressure sensor, 22: hydraulic pump, 23: in-machine control device,

Claims (2)

An excavator body equipped with a rotary driven cutter head,
A front torso connected to the machine body,
A plurality of directional control jacks arranged on the front trunk and controlling the digging direction of the machine main body,
A thrust point jack that is placed on the front barrel and applies a pressing force to the cutter head;
A control device for controlling the face pressing force of the cutter head by the thrust point jack to a face pressing pressure corresponding to the face pressure and face condition conditions;
A rotary pressing machine with a face pressing force control.   The rotary control machine according to claim 1, wherein the control device controls the pressing force of the cutter head based on a hydraulic value applied to the thrust point jack.

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