KR-102963334-B1 - PIPE HEAT TREATMENT APPARATUS

KR102963334B1KR 102963334 B1KR102963334 B1KR 102963334B1KR-102963334-B1

Abstract

The present invention relates to a defect-free pipe heat treatment device, and more specifically, to a defect-free pipe heat treatment device that stably straightens a pipe supplied to a heat treatment unit while maintaining tension so that defects such as surface scratches do not occur during heat treatment. To achieve the above objectives, the defect-free pipe heat treatment device according to the present invention comprises a pipe supply unit and a pipe heat treatment unit, wherein the pipe supply unit comprises a base and a pipe feeder including a supply basket that is horizontally installed on the base and on which a coiled pipe bundle is placed to rotate in one direction to unwind the pipe; a pipe flattener that flattens the pipe by including a lower pressure roller and an upper pressure roller that are alternately arranged vertically along the pipe's conveying direction and each have an upper and lower end pressing the lower and upper surface of the pipe being conveyed, respectively; a pipe washer that washes the outer surface of the pipe being conveyed; and a pipe tensioner that supplies the pipe to the pipe heat treatment unit in a state in which tension is applied to the pipe, by including an upper support roller and a lower support roller that are alternately arranged vertically along the pipe's conveying direction and are spaced apart vertically by a certain height or more to support the lower and upper surface of the pipe, respectively.

Inventors

한종균

Assignees

(주)에스엘테크

Dates

Publication Date: 20260511
Application Date: 20260130

Claims (4)

In a defect-free pipe heat treatment device including a pipe supply section and a pipe heat treatment section, The above pipe supply A pipe feeder comprising a base and a supply basket that is horizontally installed on the base and on which a coiled pipe bundle is placed, and which rotates in one direction to unwind the pipe. A pipe flattener comprising a lower pressure roller and an upper pressure roller that are alternately arranged vertically along the conveying direction of the pipe, wherein the upper and lower portions respectively press the lower and upper portions of the pipe being conveyed, thereby flattening the pipe. A pipe cleaner that cleans the outer surface of a pipe being transported, It includes a pipe tensioner that includes an upper support roller and a lower support roller that are alternately arranged vertically along the conveying direction of the pipe and are spaced apart vertically by a certain height or more to support the lower surface and the upper surface of the pipe, respectively, and supplies the pipe to the pipe heat treatment unit while applying tension to the pipe. A defect-free pipe heat treatment device characterized by comprising a pipe feeder comprising a rotating bar axially mounted on the upper surface of one end of the base and rotating, a first supply basket installed on the upper surface of the other end of the rotating bar, and a second supply basket installed on the other end of the base.
In Article 1, The above pipe cleaning device is characterized by comprising: a cleaning box having a first cleaning section and a second cleaning section that are compartmentalized and through which a pipe being transported passes; a spray pipe that sprays cleaning water onto the pipe being transported in the first cleaning section; and a cleaning member that wraps around the pipe being transported in the second cleaning section to clean the outer surface of the pipe.
In Article 1, A defect-free pipe heat treatment device characterized in that the lower pressure roller or the upper pressure roller is capable of changing height.
In Article 2, A defect-free pipe heat treatment device characterized by the fact that the washing water sprayed into the first washing section falls into a tank at the bottom of the washing box and is stored to maintain a constant water level on the first washing section.

Description

Flawless pipe heat treatment apparatus capable of safe pipe supply The present invention relates to a defect-free pipe heat treatment device capable of safely supplying pipes, and more specifically, to a defect-free pipe heat treatment device that stably straightens a pipe supplied to a heat treatment unit while maintaining tension so that defects such as surface scratches do not occur during heat treatment. Metal pipes, especially stainless steel 300 series pipes, are used in various fields such as laparoscopes, medical devices, and water purifiers. These stainless steel pipes are formed into pipe shapes through a drawing process; however, since internal stress accumulates, ductility decreases, and the material becomes brittle during the drawing process, a heat treatment process must be performed after drawing. As shown in Fig. 1, the heat treatment process of the stainless steel pipe is a method in which it is heated by passing through a high temperature (1050℃) heating zone (HZ) and then cooled by passing through a rapid cooling zone (RCZ). At this time, as the stainless steel pipe (P) passes through the heating zone (HZ), thermal deformation occurs due to high-temperature heating, causing the stainless steel pipe to bend as it is transported. As the bending direction is formed downward due to gravity, the outer surface of the stainless steel pipe comes into contact with the inside of the chamber of the heating zone (HZ). Contact with stainless steel pipes during this heat treatment process causes surface defects such as scratches, tearing, and other pits and dents on the surface, and these surface defects account for more than 95% of all defects in stainless steel pipes. In particular, since stainless steel has a higher coefficient of thermal expansion than ordinary metals (approximately 25% to 50% higher than ordinary metals), it bends more than ordinary metals due to the high-temperature environment of the heating zone (HZ), and thus surface defects frequently occur during the heat treatment process. To prevent such surface defects, it is important to ensure that the pipe does not come into contact with the inner surface of the heating zone. Therefore, technology is required to support the pipe in a stable state before it enters the heating zone and to consistently control its thermal deformation within the zone. For reference, there is Registered Patent No. 10-1254762 as prior art related to this. Figure 1 is a conceptual diagram showing the heat treatment process of a stainless steel pipe. FIGS. 2 and 3 are schematic side views illustrating a defect-free pipe heat treatment apparatus according to the present invention. FIG. 4 is a schematic plan view illustrating a pipe feeder according to the present invention. FIG. 5 is a cross-sectional view schematically illustrating a pipe cleaning machine according to the present invention. FIG. 6 is a cross-sectional view of a key part of a defect-free pipe heat treatment device according to the present invention. FIG. 7 is a front view of a key part of a defect-free pipe heat treatment device according to the present invention. FIG. 8 is a front view illustrating another embodiment of FIG. 7. FIG. 9 is a cross-sectional view of a key part illustrating another embodiment of FIG. 6. FIG. 10 is a plan view of a key part of a gas chamber according to the present invention. The present invention is capable of various modifications and may take various forms, and embodiments (aspects or examples) are to be described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. For convenience in describing the defect-free pipe heat treatment device according to the present invention, a rough, non-strict directional standard is specified with reference to FIG. 2. The direction of pipe transport is set as the front, and the direction in which gravity acts is set as the bottom, and the up, down, left, and right directions are determined as they appear. Unless otherwise specifically mentioned in the detailed description of the invention and claims related to other drawings, directions are specified and described according to this standard. Hereinafter, a defect-free pipe heat treatment device according to the present invention will be described with reference to the attached drawings. The present invention relates to a defect-free pipe heat treatment device that heats and cools a drawn pipe, particularly a stainless steel pipe, connected to a pipe forming machine. As shown in FIGS. 1 to 10, the device comprises a pipe supply unit (A), a pipe heat treatment unit (B), a blower cooling unit (C), and a pipe winding unit (D). The pipe supply unit (A) is composed of a pipe feeder (A1), a pipe flattener (A2), a pipe washer (A3), and a pipe tensioner (A4). The pipe hea