Probe-type foreign object removal tool for heat exchanger tube

Abstract

The probe-type heat exchanger tube foreign matter removal device of the present invention comprises a flexible cable corresponding to a non-rotating part, a rotating part for removing foreign matter, a water supply device, and a transfer device for transporting and retrieving the heat exchanger tube foreign matter removal device. Water supplied through four water supply tubes of the water supply device, which includes a pump, is sprayed obliquely at an angle of inclination by a water spray nozzle capable of rotating 0° and 180° to remove foreign matter inside the heat exchanger tube. A tool wire for controlling the rotating part, which is controlled by a tension control motor and a tension force limiting switch of the transfer device, is installed within the flexible cable. The transfer device is provided with a separate transfer wire to transport the probe-type heat exchanger tube foreign matter removal device, which consists of the flexible cable and the rotating part for removing foreign matter. A tool wire for transporting the tool is arranged at the center of the flexible cable, and four water supply tubes are arranged around the circumference of the tool wire. The rotating part is characterized by being configured to include a first gripper, first and second cylindrical sheet metal fixing parts, a second gripper, a sheet metal fixing head part, and a flexible metal sheet metal outer shell.

Description

Technology Field

[0001] The present invention relates to a probe-type heat exchanger tube foreign matter removal device for physically crushing and removing hardened foreign matter accumulated inside the steam generator and condenser heat transfer tubes of a nuclear power plant, thereby preventing signal noise, inspection failure, tube damage, etc., that may occur during eddy current inspection. Background Technology

[0003] A device for removing foreign substances inside a boiler tube, which allows for efficient removal of foreign substances while moving smoothly inside the tube, is described in Korean Registered Patent Publication No. 10-1774768 (September 5, 2017).

[0004] A foreign matter removal device inside a boiler tube comprises a plurality of conveying bars arranged in an arc shape, a conveying section formed in the longitudinal direction, and a power transmission section that rotates the conveying bars of the conveying section.

[0005] It is composed of a housing coupled to the rear side of the conveying unit, with a protective case penetrating the centerline of the conveying unit; a separation processing unit coupled to the front of the conveying bar of the conveying unit, with a rotating disc equipped with a removal brush; and a removal unit inserted into the protective casing of the housing to observe the tube and remove foreign substances simultaneously.

[0006] Therefore, it is characterized by allowing smooth back-and-forth movement within the tube, while simultaneously effectively separating foreign substances within the tube and efficiently removing the separated foreign substances by sucking or adsorbing them.

[0007] Korean Registered Patent Publication No. 10-1796159 (November 13, 2017) describes a defect detection device for removing magnetic substances having a structure capable of effectively removing magnetic substances attached to a leakage flux detection device or a partial saturation eddy current detection system for non-destructive testing of small-diameter heat transfer tubes.

[0008] A defect detection device that facilitates the removal of magnetic substances comprises a cylindrical main body having screw threads formed inside both ends and housing a magnet that magnetizes the object to be measured, a sensor section having a plurality of magnetic sensors along the outer surface of the main body, a coil wound along the outer surface of the sensor section, and a protective case provided in a form that encloses the main body, the sensor section, and the coil.

[0009] Each is fitted into both ends of the protective case and is provided with a first support member and a second support member with a through hole, and a screw portion formed inside both ends of the main body passing through the through hole of the first support member and the second support member.

[0010] It is configured to be fitted into one end of a protective case when a first fixing member, a second fixing member, a first support member, and the first fixing member are removed and the first fixing member are removed, and includes a magnetic foreign matter removal cap with a through hole in the interior.

[0011] The first support member and the first fixing member are removed, and a magnetic foreign matter removal cap is fitted to one end of the protective case. Then, a ferromagnetic material with a magnetic force greater than that of the magnet is used to remove the magnet from the main body, thereby guiding the magnetic foreign matter attached to the protective case to the magnetic foreign matter removal cap for removal. Prior art literature

[0013] Korean Registered Patent Publication KR 10-1774768 B1 Korean Registered Patent Publication KR 10-1796159 B1 The problem to be solved

[0014] During the overhaul after every operation, inspections of the steam generator and condenser heat transfer tubes are performed. However, foreign substances frequently occur inside the condenser heat transfer tubes, causing the surface of the inspection object to be uneven, which often hinders eddy current testing.

[0015] In particular, there are cases where foreign substances cannot be removed by air pressure cleaning due to their high hardness, which causes significant disruption to inspection and necessitates their physical removal.

[0016] Therefore, the present invention aims to prevent excessive signal noise, resulting inspection failure, and tube damage that may occur during eddy current testing by physically crushing and removing foreign substances inside the heat transfer tubes of the steam generator and condenser of a power plant. means of solving the problem

[0018] The probe-type heat exchanger tube foreign matter removal device of the present invention includes a flexible cable corresponding to a non-rotating part, a rotating part for removing foreign matter, a water supply device, and a transfer device for transferring and recovering the heat exchanger tube foreign matter removal device.

[0019] The water supplied through four water supply tubes from a water supply device including a pump of the present invention is configured to spray obliquely at an angle of inclination of 45 degrees counterclockwise through water spray nozzles located at 0°, 90°, 180°, and 270° to rotate a rotating part clockwise in order to remove foreign substances inside the heat exchanger tube.

[0020] A tension control wire for controlling a rotating part controlled by a tension control motor and a tension force limiting switch of the transfer device of the present invention is installed within a flexible cable.

[0021] The transfer device of the present invention uses a separate transfer device to transfer a heat exchanger tube foreign matter removal device in the form of a probe, which consists of a flexible cable and a rotating part for removing foreign matter. Commercial models for eddy current testing transfer may also be used for such a transfer device.

[0022] In the center of the flexible cable of the present invention, a tension control wire that controls the operation of the rotating part and four water supply tubes are arranged around the tool wire.

[0023] The rotating part of the present invention is configured to include a first gripper, first and second cylindrical thin plate fixing parts, a second gripper, a thin plate fixing head part, and a flexible metal thin plate outer shell.

[0024] A free rotation drive shaft is formed to enable free rotation of the entire rotating part inside the flexible cable of the present invention.

[0025] The first cylindrical thin plate fixing part of the present invention is configured to be inserted and coupled to the second cylindrical thin plate fixing part, and an elastic support spring is provided inside the first cylindrical thin plate fixing part and the second cylindrical thin plate fixing part.

[0026] The first cylindrical thin plate fixing part of the present invention is provided with a shrinkage / expansion guide groove that guides the rotational shrinkage / expansion of the first and second cylindrical thin plate fixing parts, and the second cylindrical thin plate fixing part is provided with a guide protrusion that moves along the shrinkage / expansion guide groove.

[0027] The shrinkage and expansion guide groove of the first cylindrical thin plate fixing part of the present invention is formed to be inclined at 45° after moving straight.

[0028] The first cylindrical thin plate fixing part and the second cylindrical thin plate fixing part of the rotating part of the present invention are inserted into an elastic support spring, and the support spring is configured to be gripped and coupled by a first gripper and a second gripper.

[0029] The rotating part of the present invention is configured such that the first cylindrical thin plate fixing part and the second cylindrical thin plate fixing part have hollow interiors of different diameters in the form of metal cylinders, and elastic support springs are embedded within the first cylindrical thin plate fixing part and the second cylindrical thin plate fixing part, allowing the first cylindrical thin plate fixing part and the second cylindrical thin plate fixing part to contract and expand with each other.

[0030] In the first cylindrical thin plate fixing part and the second cylindrical thin plate fixing part of the rotating part of the present invention, flat fixing holes are formed at the upper and lower ends, respectively, so as to fix a metal thin plate outer shell.

[0031] In the present invention, metal blade support wires for supporting the blades of the metal thin sheet outer shell are provided inside the metal thin sheet outer shell in proportion to the number of blades.

[0032] The flexible metal thin sheet outer shell of the present invention has a cut line and a fixing hole formed therein.

[0033] The flexible metal sheet outer shell of the present invention is configured to install the flexible metal sheet outer shell in the first and second cylindrical sheet fixing parts using a fastener in the fixing hole and the fixing hole formed in each of the first and second cylindrical sheet fixing parts.

[0034] The blade, which is the cutting line of the metal thin plate outer shell of the present invention, is processed to be formed only on one side of the iron piece and is mounted with the inner and outer sides distinguished.

[0035] The blade is supported by first and second grippers, which are blade supports, inside the rotating part of the present invention, and when the tension control wire is pulled, the entire rotating part contracts and rotates so that the metal sheet outer blade and the blade support wire of the rotating part spread out and come into contact with the inside of the tube.

[0036] The rotating part of the present invention slides into a rotating shrinkage guide groove so that the metal sheet outer shell creates a rotating blade when shrinking, and when tension is applied to the tension control wire, the upper part moves straight along the rotating shrinkage guide groove and then rotates at a certain angle.

[0037] The blade, which is the cutting line of the metal sheet outer shell of the present invention, is directed inward, and the basic tension of the tension control wire is set or adjusted to remove foreign substances without damaging the inside of the heat exchanger tube. Effects of the invention

[0039] The probe-type heat exchanger tube foreign matter removal device of the present invention has a low failure rate and low cost due to its simple mechanical mechanism, and can be recycled simply by replacing the metal thin-plate outer shell of the blade generating part. Additionally, water is sprayed from the nozzle at the bottom of the probe to the tube contact area, allowing for the simultaneous performance of blade rotation, cleaning of contaminated areas, and cooling of the heat generation part. Brief explanation of the drawing

[0041] FIG. 1 is a schematic diagram of a probe-type heat exchanger tube foreign matter removal device according to the present invention. FIG. 2 is a schematic diagram of a heat exchanger tube foreign substance removal device for removing foreign substances according to the present invention. FIG. 3 illustrates a configuration in which the first and second cylindrical thin plate fixing parts according to the present invention are combined to contract and expand. FIG. 4 is a detailed configuration diagram of the rotating part of the heat exchanger tube foreign matter removal device according to the present invention. FIG. 5 is a plan view of a flexible metal sheet outer shell corresponding to the blade of a heat exchanger tube foreign matter removal device according to the present invention. FIGS. 6(a), (b), (c), and (d) are model photographs showing the pre-contraction state, fully contracted state, 45° rotated contracted state, and contracted state of the rotating part of the heat exchanger tube foreign matter removal device according to the present invention, respectively, from the front. Specific details for implementing the invention

[0042] The present invention relates to a probe-shaped heat exchanger tube foreign matter removal device comprising a rotating part that grinds foreign matter while rotating in a shape similar to a probe, a blade that grinds foreign matter inside a tube, a guide groove that brings the blade into contact with the inner wall of the tube, and a tension limit switch that prevents damage to the tube.

[0043] Hereinafter, a probe-type heat exchanger tube foreign matter removal device according to the present invention will be described in more detail with reference to the attached drawings.

[0044] FIG. 1 is a schematic diagram of a probe-type heat exchanger tube foreign matter removal device according to the present invention.

[0045] The probe-type heat exchanger tube foreign matter removal device (100) according to the present invention is configured to include a flexible cable (200) corresponding to a non-rotating part, a rotating part (300) for removing foreign matter, a water supply device (400), and a transfer device (500) for transferring and recovering the heat exchanger tube foreign matter removal device (100).

[0046] The probe-type heat exchanger tube foreign matter removal device is configured with an overall appearance similar to an MRPC (Motorized Rotation Pancake Coil) eddy current probe.

[0047] Water supplied through four water supply tubes (410) from a water supply device (400) including a pump is sprayed through a water spray nozzle (420) to remove foreign matter inside the heat exchanger tube.

[0048] The water supplied through the four water supply tubes (410) is configured such that the water spray nozzles (420) located at 0°, 90°, 180°, and 270° are sprayed obliquely at an angle of inclination of 45 degrees clockwise to rotate the rotating part.

[0049] The transfer device (500) is configured to include a tension control motor (510) for controlling the rotation part (300), a tension limit switch (520), and a tension control wire (530).

[0050] A separate transfer device is used to transfer a probe-shaped heat exchanger tube foreign matter removal device, which consists of a flexible cable (200) corresponding to a non-rotating part and a rotating part (300) for removing foreign matter, in the transfer device (500). Commercial models for eddy current testing transfer may also be used in this transfer device.

[0052] As indicated by the enlarged cross-section “A”, the flexible cable (200) has a tension control wire (530) responsible for controlling the rotation in the center and four water supply tubes (410) arranged around the periphery.

[0053] The tool wire (530) is configured to have a motor that controls the tool wire tension force for controlling the rotating part (300), and a tension force limiting switch part (520) that limits the tension applied to the tension control motor part (510) when the tension force exceeds the appropriate tension force.

[0054] The water spray nozzle (420) is set to rotate counterclockwise based on the area where the tube and the blade meet, and is set to spray at intervals of ±10mm up and down.

[0055] FIG. 2 is a schematic diagram of a heat exchanger tube foreign substance removal device for removing foreign substances according to the present invention.

[0056] The transfer device (500) is composed of a flexible cable (200) having a tension wire control motor (510) used for controlling the rotating part and a tension control wire (530) for controlling the rotating part (300) which is controlled by a tension force limiting switch (520).

[0057] The rotating part (300) is configured to include a first gripper (310), first and second cylindrical sheet metal fixing parts (340, 350), a second gripper (320), a sheet metal fixing head part (330), and a flexible metal sheet metal outer shell (600).

[0058] The first gripper (310) and the second gripper (320) are made of metal.

[0059] FIG. 3 illustrates a configuration in which the first and second cylindrical thin plate fixing parts according to the present invention are combined to contract and expand.

[0060] The first cylindrical thin plate fixing part (340) is configured to be inserted and coupled to the second cylindrical thin plate fixing part (350), and an elastic support spring (370) is provided inside the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350).

[0061] The first cylindrical sheet metal fixing part (340) is provided with a shrinkage / expansion guide groove (341) that guides the rotational shrinkage / expansion of the first and second cylindrical sheet metal fixing parts, and the second cylindrical sheet metal fixing part (350) is provided with a guide protrusion (351) that moves along the shrinkage / expansion guide groove (341).

[0062] The shrinkage / expansion guide groove (341) of the first cylindrical sheet metal fixing part (340) is formed at an angle of 45° after moving straight.

[0063] The first cylindrical sheet metal fixing part (340) and the second cylindrical sheet metal fixing part (350) are inserted into an elastic support spring (370), and the support spring (370) is configured to be gripped and coupled by the first gripper (310) and the second gripper (320).

[0064] The rotating part (300) is in the form of a metal cylinder and has an elastic support spring (370) inside the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350), which are hollow with different diameters, so that the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350) can contract and expand with each other.

[0065] In the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350) of the rotating part (300), flat fixing holes (360) are formed at the upper and lower ends, respectively, so as to fix a metal thin plate outer shell (600), and the number of flat fixing holes (360) is at least 4.

[0066] Metal blade support wires (380) for supporting the blades of the metal sheet outer shell (600) are provided inside the metal sheet outer shell in the same number as the blades.

[0067] The outer circumference of the first cylindrical sheet metal fixing part (340) and the second cylindrical sheet metal fixing part (350) is interconnected by a metal blade support wire.

[0068] The metal blade support wire serves to support the flexible metal sheet outer shell corresponding to the blade.

[0069] FIG. 4 is a detailed configuration diagram of the rotating part of the heat exchanger tube foreign matter removal device according to the present invention.

[0070] The free rotation connection part (540) of the tension control wire (530) inside the flexible cable (200) and the free rotation connection part (550) of the rotation part (300) are combined to form a free rotation drive shaft capable of free rotation.

[0071] Inside the flexible cable (200) corresponding to the non-rotating part, a tension control wire (530) for controlling the rotating part (300) connected to the tension control motor part (510) and the tension force limiting switch part (520) of the transfer device (500) is provided with a free rotation connection part (540) at the rear end.

[0072] The rotating part (300) is provided with a free rotation connecting part (550) at the front end of a tool wire (530) for controlling the rotating part (300) that connects the first gripper (310), the first and second cylindrical sheet fixing parts (340, 350), the second gripper (320), and the sheet fixing head part (330).

[0073] The free rotation connection part (540) of the tension control wire (530) inside the flexible cable (200) and the free rotation connection part (550) are mutually coupled to form a free rotation drive shaft of the rotation part (300), so as to enable free rotation.

[0074] The first and second cylindrical sheet metal fixing parts (340, 350) have a fixing hole (360) formed therein for mounting a flexible metal sheet metal outer shell (600).

[0075] The first cylindrical sheet metal fixing part (340) and the second cylindrical sheet metal fixing part (350) are interconnected by a metal blade support wire (380) on their outer circumference.

[0076] The metal blade support wire (380) can support the flexible metal sheet outer shell (600) corresponding to the blade.

[0077] FIG. 5 is a plan view of a flexible metal sheet outer shell corresponding to the blade of a heat exchanger tube foreign matter removal device according to the present invention.

[0078] A cut line (610) and a fixing hole (620) are formed in the flexible metal sheet outer shell (600).

[0079] The flexible metal sheet outer shell (600) is installed on the first and second cylindrical sheet fixing parts (340, 350) using a fastener in the fixing hole (610) and the fixing hole (360) formed in each of the first and second cylindrical sheet fixing parts (340, 350).

[0080] The outer and inner cross-sections of the cut line (610) of the flexible metal sheet outer shell (600) form a blade having a metal inclined cross-section as in the enlarged portion “B”.

[0081] The blade, which is the cut line (610) of the metal sheet outer shell, is processed to be formed only on one side of the iron piece and is mounted with the inside and outside distinguished.

[0082] The blade is supported by the first and second grippers (310, 320), which are blade supports, inside the rotating part (300), and when the tension control wire (530) is pulled, the metal sheet outer blade and the blade support wire (380) of the rotating part are spread out and come into contact with the inside of the tube.

[0083] First and second grippers are provided at the upper and lower ends of the rotating part to fix a metal sheet outer shell in a cylindrical shape.

[0084] In addition, the tool wire for self-rotation is provided with a free rotation connection (540, 550) to form a free rotation drive shaft.

[0085] When the rotating part (300) contracts, the metal sheet outer shell slides into the rotational contraction guide groove to create a rotating blade, and when tension is applied to the metal blade support, the upper part rotates at a certain angle along the rotational contraction guide groove (341).

[0086] The blade, which is the cut line (610) of the metal sheet outer shell, is directed inward, and additionally, the basic tension of the tension control wire is set or adjusted to remove foreign matter without damaging the inside of the heat exchanger tube.

[0087] FIGS. 6(a), (b), (c), and (d) are model photographs showing the pre-contraction state, fully contracted state, 45° rotated contracted state, and contracted state of the rotating part of the heat exchanger tube foreign matter removal device according to the present invention, respectively, from the front.

[0088] In Fig. 6(a), the model of the rotating part before contraction shows only the shape of the incision line.

[0089] In Fig. 6(b), the rotating part is in a fully contracted state, with blades formed only in the central part in the direction of the circumference of the rotating part.

[0090] In Fig. 6(c), when the model of the rotating part is rotated and contracted by 45°, the blade is formed at a 45° angle of inclination.

[0091] Figure 6(d) shows the contracted state of the rotating part as viewed from the front.

[0092] Meanwhile, it is applicable to steam generator and condenser heat transfer tubes, as well as U-shaped tubes with a size of 20 to 24 mm. A limiter is installed to release the tube when the appropriate tension is exceeded, thereby preventing damage to the tube when the allowable limit is exceeded.

[0093] The appropriate tensile strength is defined as the standard for the tensile strength at which the equipment stops operating at the corner of the U-tube.

[0094] The probe-type heat exchanger tube foreign matter removal device of the present invention has a low failure rate and low cost due to its simple mechanical mechanism, and can be recycled simply by replacing the metal thin-plate outer shell where the blade is generated. Additionally, water is sprayed from a nozzle at the bottom of the probe to the tube contact area, allowing for the simultaneous rotation of the blade, cleaning of the contaminated area, and cooling of the heat generation area.

[0095] Although the present invention has been described in detail through representative embodiments above, those skilled in the art will understand that various modifications can be made to the above-described embodiments within the scope of the present invention.

[0096] Therefore, the scope of the rights of the present invention should not be limited to the described embodiments, but should be determined by the claims set forth below as well as all modifications or variations derived from the claims and equivalent concepts. Explanation of the symbols

[0098] 100: Heat exchanger tube foreign matter removal device 200: Flexible cable 300: Rotating part 310: 1st Gripper 320: 2nd Gripper 330: Thin plate fixing head 340: First cylindrical sheet metal fixing part 341: Guide Home 350: Guide protrusion 360: Fixed hole 370: Elastic support spring 380: Blade support wire 400: Supply device 410: Water supply tube 420: Water spray nozzle 500: Transfer device 510: Tension control motor unit 520: Tension limiting switch section 530: Tension control wire 540: Free rotation connection 550: Free rotation connection 600: Metal sheet metal sheath 610: Incision line 620: Fixing hole

Claims

Claim 1 A probe-shaped heat exchanger tube foreign matter removal device (100) includes a flexible cable (200) corresponding to a non-rotating part, a rotating part (300) for removing foreign matter, a water supply device (400), and a transfer device (500) for transferring and recovering the foreign matter removal device. Water supplied through four water supply tubes (410) from a water supply device (400) including a pump is sprayed at an angle with an inclination by a water spray nozzle (420) capable of rotating 0° and 180° to remove foreign matter inside the heat exchanger tube. A tension control wire (530) for controlling the rotating part (300), which is controlled by a tension control motor (510) and a tension force limiting switch (520) of the transfer device (500), is installed within the flexible cable (200). A probe-shaped heat exchanger tube foreign matter removal device is provided with a separate transfer wire to transfer a probe-shaped heat exchanger tube foreign matter removal device, which is composed of a flexible cable (200) and a rotating part (300) for removing foreign matter, and a tension control wire (530) for transferring a tool is arranged at the center of the flexible cable (200), and four water supply tubes (410) are arranged around the tension control wire (530). The rotating part (300) is configured to include a first gripper (310), first and second cylindrical thin plate fixing parts (340, 350), a second gripper (320), a thin plate fixing head part (330), and a flexible metal thin plate outer shell (600). Claim 2 A probe-type heat exchanger tube foreign matter removal device according to claim 1, characterized in that the free rotation connection part (540) of the tension control wire inside the flexible cable (200) and the free rotation connection part (550) of the rotation part (300) are mutually coupled to form a free rotation drive shaft capable of free rotation. Claim 3 A probe-type heat exchanger tube foreign matter removal device according to claim 2, wherein the first cylindrical thin plate fixing part (340) is configured to be inserted and coupled to the second cylindrical thin plate fixing part (350), and an elastic support spring (370) is provided inside the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350). Claim 4 A probe-type heat exchanger tube foreign matter removal device according to claim 3, wherein the first cylindrical thin plate fixing part (340) is provided with a shrinkage / expansion guide groove (341) that guides the rotational shrinkage / expansion of the first and second cylindrical thin plate fixing parts, and the second cylindrical thin plate fixing part (350) is provided with a guide protrusion (351) that moves along the shrinkage / expansion guide groove (341), and the shrinkage / expansion guide groove (341) of the first cylindrical thin plate fixing part (340) is formed at an angle of 45° after moving straight. Claim 5 In claim 4, the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350) of the rotating part (300) are inserted into an elastic support spring (370), and the support spring (370) is gripped and coupled by the first gripper (310) and the second gripper (320), and the rotating part (300) is in the form of a metal cylinder with hollow first cylindrical thin plate fixing part (340) and second cylindrical thin plate fixing part (350) of different diameters, and the elastic support spring (370) is embedded inside, so that the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350) are configured to be mutually contracting and expanding, thereby forming a probe-type heat exchanger tube foreign matter removal device. Claim 6 In claim 5, the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350) of the rotating part (300) each have flat fixing holes (360) formed at the upper and lower ends, respectively, to fix the metal thin plate outer shell (600), and metal blade support wires (380) for supporting the blades of the metal thin plate outer shell (600) are provided inside in the same number as the number of blades of the metal thin plate outer shell, and the first cylindrical thin plate fixing part (340) and the second cylindrical thin plate fixing part (350) are interconnected by metal blade support wires on their outer circumferences, characterized by a probe-type heat exchanger tube foreign matter removal device. Claim 7 A probe-type heat exchanger tube foreign matter removal device according to claim 6, wherein a cut line (610) and a fixing hole (620) are formed in the flexible metal sheet outer shell (600), and the flexible metal sheet outer shell (600) is installed in the first and second cylindrical sheet fixing parts (340, 350) using a fastener in the fixing hole (610) formed in the flexible metal sheet outer shell (600) and the fixing hole (360) formed in each of the first and second cylindrical sheet fixing parts (340, 350). Claim 8 A probe-type heat exchanger tube foreign matter removal device according to claim 7, wherein the blade, which is the cut line (610) of the metal sheet outer shell, is processed to be formed only on one side of the iron piece and is mounted with the inner and outer sides distinguished, the blade is supported by first and second grippers (310, 320), which are blade supports, inside the rotating part (300), and when the blade support wire (380) is pulled, the metal sheet outer shell blade and the blade support of the rotating part spread out and come into contact with the inner side of the tube. Claim 9 In claim 8, the rotating part (300) slides into a rotating shrinkage guide groove so that the metal thin sheet outer shell creates a rotating blade when shrinking, and when tension is applied to the metal blade support wire, the upper part rotates at a certain angle along the rotating shrinkage guide groove (341), the blade, which is the cut line (610) of the metal thin sheet outer shell, is directed inward, and the tension of the metal blade support wire is adjusted to remove foreign matter without damaging the inside of the heat exchanger tube, characterized by a probe-type heat exchanger tube foreign matter removal device.

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