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Scale removing method and scale removing device

An oxide scale and steel pipe technology, applied in the field of oxide scale removal devices, can solve problems such as poor suction ability of vacuum cleaners, and achieve the effect of improving the working environment and saving energy.

Inactive Publication Date: 2011-02-23
SUMITOMO METAL IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ejector effect increases or decreases according to the inner diameter of the steel pipe, so it is not good to design the suction capacity of the vacuum cleaner corresponding to the case where the ejector effect is large from the viewpoint of energy saving

Method used

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  • Scale removing method and scale removing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In order to confirm the effect of the present invention, at first, the following experiment was carried out, that is, a high-pressure injection nozzle was inserted from one end of a pipe with a different inner diameter, and the ejection pressure (nozzle pressure) of the nozzle was changed to make air eject in various ways, and it was confirmed that it was consistent with Air flow at the end of the tube inserted on the opposite side of the end with the nozzle. In the experiment, it is measured that the inner diameter of the abrasive purge material delivery pipe is 5.27mm, and the nozzle pressure is 4.9-39.2N / cm with a high-pressure jet nozzle. 2 The amount of air discharged from the end of the pipe when the air is injected into the steel pipe with different inner diameters. The result is expressed in Figure 5 .

[0041] If the air flow in the pipe is 2Nm 3 Below 14.0kW (caliber 100Φmm, 1750rpm, -5000mmAq) low-capacity blower can completely remove the dust generated d...

Embodiment 2

[0044] Next, use figure 1 The suppressing member of the present invention shown was subjected to an experiment in which a high-pressure injection nozzle was inserted into one end of a pipe having various pipe inner diameters, and the pressure of the nozzle was ejected while the end of the pipe on which the nozzle was inserted was blocked. 39.2N / cm 2 As above, check the air flow rate at the pipe end opposite to the pipe end where the nozzle is inserted. The result is expressed in Figure 6 . in addition, Figure 6 The comparative example in is the above-mentioned 39.2N / cm 2 example of.

[0045] Such as Figure 6 Shown, in the example of the present invention, even in the spray 39.2N / cm 2 In the case of such a high pressure air, the air flow in the pipe will not increase that much, and in any case, the air flow in the pipe can be limited to 5Nm 3 / min or less.

[0046] Next, use figure 2 and image 3 The suppression components shown were subjected to the same experi...

Embodiment 3

[0048] Next, in order to study the conditions under which no dust is generated, steel pipes with outer diameters of 88.9mm, 114.3mm and 177.8mm were prepared, and a high-pressure jet nozzle (nozzle diameter: 10.0mm) was inserted from one end of the steel pipe, while jetting and grinding purge material (jet flow rate: 5.9Nm 3 / min), while using the vacuum cleaner connected to the other end to inhale the jet grinding purge material (suction flow: 11.9Nm 3 / min), the generation of dust and the flow rate in the pipe at this time were investigated. Suction flow rate / jet flow rate (hereinafter referred to as “Yc”) is 2. Such as Figure 7 As shown, experiments were carried out in which a suppressing plate having a size equal to or greater than the inner diameter of the steel pipe was prepared as a suppressing member near the pipe end on the nozzle insertion side, and the distance a between the pipe end and the suppressing plate was varied in various ways. The flow rate in the pipe...

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Abstract

A scale removing device (7) performing blast processing of the inner surface of a steel tube (3) by causing a grinding and cleaning material (not shown) ejected from a high-pressure nozzle (2) to collide with the inner surface of the steel tube (3). The scale removing device (7) has the high-pressure nozzle (2) for ejecting the grinding and cleaning material, a dust collector (4) for collecting powder dust after blast processing, and a suppressing means (6) for suppressing inflow of air into a steel tube (3) from an end of the steel tube (3) occurring as the grinding and cleaning material ejected from the high-pressure nozzle (2) moves. Even if the dust collector has a small power capacity, the scale removing device (7) can remove scale without causing the powder dust to disperse into the atmosphere.

Description

technical field [0001] The present invention relates to a descaling method and a descaling device for spraying the inner surface of a steel pipe by causing abrasive purge material sprayed from a high-pressure spray nozzle to collide with the inner surface of the steel pipe. Background technique [0002] Steel pipes are often heat-treated depending on the purpose. In order to improve the quality of the steel pipe, it is important to remove scale (descale) generated on the inner and outer surfaces of the steel pipe during heat treatment. As a method for descaling the inner surface of steel pipes, so-called blast processing is known by making abrasive purge materials such as iron, stainless steel, alumina, and silica sand collide with the inner surface of steel pipes to remove scale. As the blasting treatment, there are, for example, sand blasting, shot blasting, grain blasting, etc., and as the blasting method of the abrasive purge material, a high-pressure blasting method, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24C3/32B24C3/16B24C9/00
CPCB24C3/325B24C9/003B24C1/086
Inventor 黑岩良之坂本明洋森本源二
Owner SUMITOMO METAL IND LTD
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