Movable Cover Device for Dust Collection in Sawing
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Solution Overview
Problem
Existing dust collection systems for sawing in materials like concrete, brick, and stone face challenges in maintaining effective suction due to large hood-shaped blade guards, which hinder underpressure and allow dust scattering, especially during the initial phase of cutting when the kerf is not deep enough, and often require auxiliary measures like water spraying, leading to slurry formation.
Innovation Solution
A 'mini suction box' is established within the kerf using a cover device with a terminal chamber connected to a vacuum source, which restricts air passages and includes a sealing body to reduce airflow and prevent dust scattering, allowing efficient dust collection during all phases of cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a hood-shaped blade guard is used to surround the saw blade and collect dust, then dust collection is improved, but the volume of the suction box becomes large making it difficult to maintain underpressure
Solution Approach 1:
The blade guard is divided into a fixed part and a movable cover device. The cover device can be positioned at different locations along the kerf, allowing the suction box volume to be minimized while still effectively collecting dust from the cutting zone. This segmentation enables the system to maintain underpressure more effectively.
Solution Approach 2:
The cover device is made movable along the kerf length, adding a degree of freedom to the system. This allows the suction box to be positioned optimally at different cutting depths, maintaining effective dust collection with a compact volume that can preserve underpressure.
2Object-generated harmful factors
If a hood-shaped blade guard is used to collect dust, then dust collection is improved, but the device does not function during the initial phase when the kerf is not deep enough
Solution Approach 1:
The cover device is made movable rather than fixed, allowing it to be positioned at different locations along the kerf. During the initial cutting phase, the cover device can be positioned closer to the saw blade to ensure effective dust collection, and moved back as the kerf deepens. This dynamic positioning ensures reliable dust collection throughout all phases of cutting.
3Object-generated harmful factors
If water is sprayed into the kerf to bind dust, then dust scattering is prevented, but slurry is generated creating additional problems
Solution Approach 1:
Instead of using water to bind dust (which creates slurry), the invention converts the harmful dust particles into a collectible resource by using the movable cover device to capture them directly at the source. The vacuum system then removes the dry dust particles, converting the problem of dust scattering into an efficient dry collection process without generating slurry.
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
The solution effectively collects and removes dust generated during sawing by maintaining underpressure within the kerf, reducing dust scattering, and can be used with various sawing machines, including portable and rail-mounted ones, while allowing for ergonomic operation and optional water supply for dust binding.
Implementation Method 1
a terminal chamber (60) having an inlet (45a) and an outlet (58) which can be connected to a vacuum source, characterised in that the direction of rotation of the operating blade is such that the rear part of said segment which has passed beyond the bottom surface of the cover device will move in a direction upwards-rearwards towards the bottom surface
Data Source
AI summary
A cutting and dust collecting assembly comprises a rotatable, circular saw blade (4) having a first side (20), a second side (21), and a cover device (6) with a terminal member (52). The bottom surface (36) of the cover device extends in a plane. A longitudinal passage (45, 46) for the saw blade extends through the cover device from its top surface to its bottom surface. The terminal member comprises a terminal chamber (60) having an inlet (45a), the mouth of which coincides with the plane of said bottom surface. An outlet (58) can be connected to a vacuum source. The direction of rotation of the operating blade is such that the rear part (4a) of the saw blade which has passed beyond the bottom surface of the cover device will move in a direction upwards-rearwards towards the bottom surface. The invention also concerns the cover device, a sealing body belonging to the cover device and a working machine which is provided with the cutting and dust collecting assembly.