JP3993615B2 - Excavator - Google Patents

Description

  The present invention relates to a propulsion device for constructing a tunnel or pipe having a circular cross section in the ground.

Although the excavation part of the conventional excavator rotates in a concentric circle, a difference in peripheral speed occurs between the central part and the outer peripheral part due to the difference in rotational radius, and the rotational peripheral speed of the outermost excavating bit and the rotational circumference of the central excavating bit Since the speed changed infinitely, excavation of the ground located in the center part was in a press-fit state, and excavation resistance increased. In addition, excavation, mixing, and agitation have changed greatly between the outer peripheral portion and the central portion, causing a difference in the soil removal properties, and there has been a problem such as blockage in excavation soil. As a result, the excavation efficiency and progress declined significantly.
JP 2004-360179 A

  The problem to be solved by the present invention is to provide an excavator that can increase the excavation speed by eliminating these conventional problems and reducing the excavation resistance at the center of the face.

The configuration of the present invention that solves this problem is as follows.
1) In an excavator that rotates the excavation part on the front surface to excavate the ground and takes the excavated earth and sand from the front discharge port and discharges it rearward with a discharge pipe, the excavation part is placed at the center of the front of the excavator. A central excavation part responsible for excavation of the central part of the excavation part as a rotation center and an annular outer peripheral excavation part responsible for excavation of the outer peripheral part of the excavation part by rotating outside the central excavation part, Drive means that can be driven at different rotation speeds of the outer periphery excavation section , and is a guide that feeds excavation soil to the discharge port behind the cutter of the outer periphery excavation section. 1) Description of the above 1), wherein the excavator 2) is provided with a guide that is inclined so as to be separated from the center side of the excavator toward the mouth, and the rotational speed of the central excavation part is higher than that of the outer excavation part. 3) The driving means is a single motor. The excavator 4) according to the above 1) or 2), which is configured to be able to drive the central excavation part and the outer excavation part. The drive means rotates the central excavation part and the outer excavation part forward and backward, respectively. The excavator 5) according to any one of the above 1) to 3) is provided so that the central excavation part protrudes forward from the outer peripheral excavation part, and the ground excavation in the central excavation part precedes the excavation in the outer peripheral excavation part. The excavator 6) described in any of the above 1) to 4) is provided so that the outer excavation part protrudes forward from the central excavation part, and the ground excavation is advanced in the outer excavation part and then the subsequent excavation can be performed in the central excavation part. It exists in the excavation machine in any one of said 1) -4).

  According to the present invention, it is possible to adjust the excavation speed of the outer peripheral portion and the central portion to be the same by driving the outer peripheral excavation portion and the central excavation portion at different rotational speeds, thereby reducing the excavation resistance of the central portion. This increases the excavation speed and shortens the entire excavation process.

  In the present invention, the rotation speed of the central excavation part is generally about 1.5 times that of the outer excavation part. The rotation direction of the central excavation part and the outer peripheral excavation part can be the same direction or forward and reverse directions, and is selected according to the soil quality. If the central excavation part protrudes forward from the outer peripheral excavation part, the main excavation can be performed with a low load after the initial excavation of the ground by releasing a small diameter, which is suitable for excavation of hard ground such as rock. Embodiments of the present invention will be specifically described below with reference to the drawings.

  In the first embodiment shown in FIGS. 1 and 2, the central excavation part protrudes forward from the outer excavation part, the ground is excavated by the central excavation part at a high speed rotation, and then the outer excavation part is excavated by the low speed rotation. It is an example of a digging machine. FIG. 1 is an explanatory diagram of the excavator of the first embodiment, and FIG. 2 is a front view of the excavator of the first embodiment.

  In the figure, 1 is an excavator, 2 is a skin plate, 2a is a partition wall, 3 is a central excavation part, 3a is an arm, 3b is a cutter, 3c is a mud discharge port, 3d is a gear, 4 is an outer excavation part, 4a is a ring 4b is a cutter, 4c is a guide, 4d is a gear, 5 is a motor, 5a is a drive gear, 6 is a discharge port, and 7 is a discharge pipe.

  As shown in FIGS. 1 and 2, the excavator 1 according to the first embodiment is provided with a partition wall 2a at the front portion of a cylindrical skin plate 2 and a plurality of cutters 3b and a muddy water discharge port 3c on a cross-shaped arm 3a. A central excavation part 4 is provided so as to be rotatable in front of the partition wall 2a around the center of the skin plate 2 as a rotation center, and an outer peripheral excavation part 4 provided with a plurality of cutters 4b on a ring 4a having a diameter larger than the excavation diameter of the central excavation part 3. It is rotatably provided outside the central excavation part 3 and at a rear position.

  A motor 5 is provided in the skin plate 2, and a gear 3 d formed on the shaft portion of the arm 3 a of the central excavation portion 3 and a gear 4 d formed on the inner surface of the ring 4 a of the outer excavation portion 4 are connected to the drive gear 5 a of the motor 5 and the teeth. It is combined. The gear ratio is set so that the central excavation part 3 rotates at a higher speed than the outer excavation part 4. The partition wall 2a is provided with a discharge port 6 for taking in the excavated earth and sand, and provided with a earth discharge pipe 7 for discharging the taken in excavated earth and sand to the rear.

  In the first embodiment, when the motor 5 is operated, the driving force is transmitted through the drive gear 5a, the gears 3d, 4d, and the central excavation unit 3 and the outer excavation unit 4 rotate forward and backward. Due to the gear ratio, the central excavation unit 3 rotates at a higher speed than the outer excavation unit 4. The muddy water supplied from the outside is discharged from the muddy water discharge port 3c to excavate the ground. Prior excavation is performed at the central excavation section 3 that protrudes first, and subsequent excavation is performed at the outer peripheral excavation section 4. The excavated earth and sand is efficiently taken into the earth discharge port 6 by the guide 4 c of the outer circumference excavation section 4 and discharged backward by the earth discharge pipe 7.

  As described above, conventionally, the central portion has increased the excavation resistance with respect to the outer peripheral portion, resulting in a high load. However, in the first embodiment, the central excavation portion 3 protrudes forward from the outer peripheral excavation portion 4 and rotates at a high speed. Therefore, excavation, mixing, and agitation are almost the same in the outer peripheral portion and the central portion, the excavation speed is adjusted to be the same, the excavation speed is increased, and the entire excavation process can be shortened.

  In Example 2 shown in FIG. 3, the outer excavation part protrudes forward from the central excavation part, the ground is excavated at low speed rotation in advance at the outer excavation part, and then excavation is performed at high speed rotation at the central excavation part. It is an example of a digging machine. FIG. 3 is an explanatory diagram of the excavator of the second embodiment.

  As shown in FIG. 3, the excavator 1 according to the second embodiment projects the outer excavation unit 4 forward from the central excavation unit 3. When the motor 5 is operated, the central excavation part 3 and the outer excavation part 4 rotate forward and backward. The central excavation part 3 rotates at a higher speed than the outer periphery excavation part 4 in the same manner as in the first embodiment, and the ground excavation part 4 precedes excavation, and then the central excavation part 3 performs subsequent excavation by high speed rotation. Other reference numerals and configurations are the same as those in the first embodiment.

  The excavator of the present invention is useful for an excavator structure called a hard ground or a large diameter.

It is explanatory drawing of the excavation machine of Example 1. FIG. It is a front view of the excavation machine of Example 1. It is explanatory drawing of the excavation machine of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 Skin plate 2a Bulkhead 3 Central excavation part 3a Arm 3b Cutter 3c Mud discharge port 3d Gear 4 Outer excavation part 4a Ring 4b Cutter 4c Guide 4d Gear 5 Motor 5a Drive gear 6 Drainage port 7 Drainage pipe

Claims (6)

In the excavator that rotates the excavation part on the front surface to excavate the ground, and takes the excavated earth and sand from the front discharge port and discharges it back by the earth discharge pipe, the excavation part is rotated around the center of the front of the excavator The central excavation part is responsible for excavation of the central part of the excavation part, and an annular outer peripheral excavation part that rotates outside the central excavation part and is responsible for excavation of the outer peripheral part of the excavation part. Provided with a driving means that can be driven at different rotational speeds, and that feeds excavated sediment to the discharge port behind the cutter of the outer periphery excavation unit, the surface of the guide on the excavator center side in the direction of the discharge port An excavator characterized in that a guide having a shape that is inclined so as to be farther from the center side of the excavator is provided.   The excavator according to claim 1, wherein the rotation speed of the central excavation part is higher than that of the outer excavation part.   The excavator according to claim 1 or 2, wherein the driving means is configured to drive the central excavation part and the outer excavation part with a single motor.   The excavator according to any one of claims 1 to 3, wherein the driving means rotates the central excavation part and the outer peripheral excavation part forward and backward, respectively.   The excavation machine according to any one of claims 1 to 4, wherein a central excavation part is provided so as to protrude forward from the outer excavation part, and the ground excavation is preceded by the central excavation part and the subsequent excavation can be performed by the outer excavation part.   The excavation machine according to any one of claims 1 to 4, wherein an outer peripheral excavation part is provided so as to protrude forward from the central excavation part, and the ground excavation part is preceded by excavation and then the subsequent excavation can be performed at the central excavation part.

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