Excavation Bit Flute Segmentation for Waste Rock Discharge
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Solution Overview
Problem
Existing double tubing bit type excavation tools face inefficiencies in discharging waste rocks due to centrifugal forces, leading to increased excavation resistance and potential damage to the excavation hole and casing pipe.
Innovation Solution
The excavation tool incorporates a discharge flute on the outer peripheral surface, a face flute on the tip face, and a connection flute that integrates with an intake hole to efficiently direct waste rocks into the casing pipe, while a shield wall prevents rocks from entering the gap between the casing pipe and excavation hole, aided by fluid emission holes to enhance rock removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If waste rocks are discharged through the gap between the flute portion and casing shoe, then waste rocks can be removed from the excavation hole, but excavation resistance increases and damage to the excavation hole and casing pipe may occur
Solution Approach 1:
The discharge path is segmented into multiple controlled channels: the face flute collects waste rocks from the excavation face, the connection flute transports them axially rearward, and the discharge hole at the rear end discharges them to the outside. This segmentation prevents waste rocks from entering the harmful gap between the casing shoe and excavation hole wall.
Solution Approach 2:
The connection flute acts as an intermediary channel that intercepts waste rocks moving under centrifugal force and redirects them through a controlled path to the discharge hole, preventing direct entry into the gap between the casing shoe and excavation hole wall.
2Productivity
If an intake hole is open at the center of the tip face, then waste rocks can be taken into the casing pipe, but centrifugal force prevents waste rocks from entering the intake hole
Solution Approach 1:
Instead of opening the intake hole at the center of the tip face where centrifugal force pushes rocks outward, the discharge hole is positioned at the rear end of the connection flute, away from the rotational center. This inversion allows waste rocks to be captured by the face flute and transported to the discharge location where they can exit without being repelled by centrifugal force.
Solution Approach 2:
The discharge path transitions from a radial configuration (center-opening intake) to an axial configuration (rear-end discharge). The connection flute extends in the axial direction, allowing waste rocks to be transported away from the rotational plane where centrifugal force dominates, enabling effective discharge.
3Productivity
If a face flute extends radially outward, then waste rocks can be moved to the outer peripheral side, but waste rocks may enter the space between the casing pipe and excavation hole
Solution Approach 1:
The connection flute serves as an intermediary structure that connects the face flute to the discharge hole. It intercepts waste rocks that have been moved radially outward by the face flute and redirects them axially rearward to the discharge hole, preventing them from entering the gap between the casing shoe and excavation hole wall.
Solution Approach 2:
The waste rock transport path is divided into distinct segments: the face flute for radial collection, the connection flute for axial transport, and the discharge hole for external discharge. This segmentation ensures waste rocks follow a controlled trajectory that avoids the harmful gap.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures efficient discharge of waste rocks outside the excavation hole, reducing excavation resistance and preventing damage to the casing pipe, thereby ensuring reliable casing pipe installation.
Implementation Method 1
the centrifugal force generated by the rotation of the excavation tool moves radially outward the waste rocks
Implementation Method 2
a fluid supply hole which extends along the axis... a fluid discharge hole, which is connected to the fluid supply hole of the device and is open into the tip face of the excavation bit
Data Source
AI summary
Provided is an excavation tool for efficiently taking waste rocks produced during excavation into the inner peripheral side of a casing pipe. An excavation tool (10) includes a casing shoe (11), a casing pipe (15), a rod (60), a device (40), and an excavation bit (20). The excavation bit (20) has a head portion (22) and a skirt portion (23). The head portion (22) is provided with: a face flute (27), which is open into the tip face of the head portion and extends radially outward; a connection flute (28), which is integrally connected to the outer peripheral end of the face flute (27) and extends toward the rear end side, and an intake hole (29), which is integrally connected with the discharge flute (46) of the device (40) and is open to the inner peripheral side of the skirt portion (23) from the connection flute (28).