Hybrid Blasting Device for Steel Pipe Inner Surface
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Solution Overview
Problem
Conventional high-pressure injection and negative-pressure suction blasting devices for steel pipes face inefficiencies in uniformly blasting the inner surface, particularly at the beginning and end portions, due to inadequate air speed, particle distribution, and pressure fluctuations, leading to incomplete cleaning and polishing.
Innovation Solution
A hybrid blasting device that combines high-pressure injection and negative-pressure suction, utilizing a tubular carrier fluid inflow unit with a shaft tube and whistle-shaped air feed apparatus to ensure consistent air speed and particle distribution across the steel pipe inner surface, allowing for improved blasting performance from the beginning to the end portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-pressure injection blasting device is used to feed wiping material via high-pressure air, then the wiping material can be injected into the steel pipe from one end, but the air speed becomes insufficient at the beginning portion and pressure fluctuations occur, leading to incomplete blasting
Solution Approach 1:
The patent combines high-pressure injection and negative-pressure suction into a hybrid blasting device. The high-pressure air supply unit injects carrier fluid and wiping material into the steel pipe, while the negative-pressure suction unit simultaneously sucks air and wiping material from the pipe. This merging of opposing pressure systems ensures consistent air speed throughout the pipe length, eliminating the speed insufficiency at the beginning portion and pressure fluctuations that occur with high-pressure injection alone.
Solution Approach 2:
The patent changes the pressure parameter profile along the pipe length by introducing negative-pressure suction. Instead of maintaining high pressure throughout (which causes fluctuations and insufficient speed at the beginning), the system transitions from high-pressure injection at the inlet to negative-pressure suction at the outlet, creating a controlled pressure gradient that maintains consistent air speed and improves blasting uniformity.
2Reliability
If negative-pressure suction blasting device is used to suck air from the other end of the steel pipe, then the wiping material can be fed by negative-pressure airflow, but the air speed is insufficient at the end portion, leading to incomplete cleaning
Solution Approach 1:
The hybrid blasting device merges high-pressure injection at the inlet with negative-pressure suction at the outlet. The high-pressure air supply unit provides sufficient air speed at the beginning portion by injecting carrier fluid under pressure, while the negative-pressure suction unit maintains consistent speed throughout by creating a pressure gradient. This combination ensures that both the beginning and end portions achieve adequate air speed for complete blasting.
3Quantity of substance
If conventional blasting devices are used, then the structure is relatively simple, but the particle distribution is inadequate and the amount of wiping material required is large
Solution Approach 1:
The patent merges high-pressure injection and negative-pressure suction systems into a hybrid blasting device. This combination creates a more complex structure with additional components (high-pressure air supply unit, negative-pressure suction unit, control unit), but it dramatically improves particle distribution by ensuring consistent air speed throughout the pipe. The improved distribution reduces the amount of wiping material required for complete blasting coverage.
4Ease of operation
If high-pressure air is used as carrier fluid, then the wiping material can be fed into the steel pipe, but pressure fluctuations occur and the beginning portion is not adequately blasted
Solution Approach 1:
The patent changes the pressure parameter profile by introducing negative-pressure suction to counterbalance high-pressure injection. The high-pressure air supply unit feeds wiping material using pressurized carrier fluid, but the negative-pressure suction unit simultaneously creates a pressure gradient that stabilizes the overall pressure. This parameter change from constant high pressure to controlled pressure gradient eliminates fluctuations and ensures adequate blasting at the beginning portion.
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 hybrid approach enhances the kinetic energy of the wiping or polishing material, ensuring uniform and efficient blasting of the steel pipe inner surface, improving the texture and reducing the amount of material required for complete coverage.
Implementation Method 1
a carrier fluid for suspending a wiping material or polishing material and feeding the suspended wiping material or polishing material into the steel pipe
Implementation Method 2
feeding a wiping material or polishing material suspended in a carrier fluid into the steel pipe from one end of the steel pipe
Implementation Method 3
a high-pressure air supply unit for supplying high-pressure air to the carrier fluid inflow unit
Implementation Method 4
the hybrid approach enhances the kinetic energy of the wiping or polishing material
Implementation Method 5
a negative-pressure suction unit connected to the other end of the steel pipe for suctioning the carrier fluid, the wiping material and the polishing material from the steel pipe
Implementation Method 6
ensuring consistent air speed and particle distribution across the steel pipe inner surface
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
[Problem] To provide a blasting device for steel pipe inner surface with improved blast performance as well as the capability to sufficiently blast the inner surface of the steel pipe from the beginning portion to the end portion; a blasting method for steel pipe inner surface; and a method for producing a steel pipe with excellent inner surface texture. [Solution] A blasting device for blasting steel pipe inner surface includes a tubular carrier fluid inflow unit 21 connected to one end of a horizontal steel pipe 6, and a negative-pressure suction unit connected to the other end of the steel pipe 6, and is characterized in that a polishing material or a wiping material 5 is injected horizontally into the carrier fluid inflow unit along with a carrier fluid 20 from a hole 19 formed in the edge face of the tubular carrier fluid inflow unit 21.