KR20090105508A - Apparatus for finishing the surface of large flange - Google Patents

Abstract

PURPOSE: A surface processing device of a large flange is provided to increase the machining accuracy by processing a plurality of flange surfaces at the same time. CONSTITUTION: A surface processing device of a large flange comprises a rotation driving unit, a first processing unit(120), a first position adjusting member, a second processing unit(110) and a second position adjusting member. The rotation driving unit rotates while compressing an outer circumference of an end pipe(104). The rotation driving unit makes the large flange rotate around the axis of the end pipe. The first processing unit processes a junction(102b) of the large flange. The first position adjusting member adjusts the position of the first processing to be connected with the junction of the large flange. The second processing unit processes the diameter surface of the large flange. The second position adjusting member controls the position of the second processing unit to contact to the diameter surface of the large flange.

Description

Apparatus for finishing the surface of large flange}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface processing apparatus for a flange, and more particularly, to a surface processing apparatus for a large flange capable of simultaneously machining a plurality of surfaces of a large flange at a high machining accuracy.

In general, in manufacturing a flange (flange), by cutting the original plate or bending the flat iron (bending) to produce the shape first. After that, surface finishing should be performed. For small diameter flanges (e.g., less than Φ500), lathes are easy, but large diameter flanges (e.g., Φ500 and up to Φ8000) are not easy. However, even if possible, there is a problem that the time loss required for processing is so large that work efficiency is reduced.

In contrast, end users of flanged products prefer flanged products that have high facetability and excellent airtightness on the flange face when tightening, because

1) When flat iron is used as a raw material such as a bending flange, it is not suitable for maintaining airtightness when the surface where the flange is fastened and the part such as the contact surface has a low surface processing precision and the surface roughness is severe.

2) In flanges made by welding end pipes to flat flanges, the flange and end pipes must be at right angles. .

On the other hand, there are several conventional techniques in the field of processing flange surface, for example, Korean Patent Application No. 2004-51350 (name of the invention: large flange surface processing apparatus), Korean Utility Model Registration Application No. 2006-31808 (design Name: large diameter pipe flange face processing equipment) and the like. By the way, in most of these technologies, the surface of the flange is corroded over time after the installation of a large flange in the field, in order to repair it, the workpiece is transported to a factory equipped with processing equipment, and then reinstalled after repair. It is focused on solving the problem of process interruption and time delay, which are the problems of the prior art caused by cutting the parts to be processed or by joining and repairing other repairs by welding. In other words, it is characterized in that the machining of the flange surface is performed in the field without moving to the place for repairing the flange.

Therefore, no device has yet been known to simultaneously and precisely process multiple surfaces of a large flange, which is difficult to lathe.

The technical problem of the present invention for solving the above problems of the prior art is to provide a surface processing apparatus for a large flange that can process several surfaces of the flange at the same time high processing accuracy.

"의 단면구조를 갖는 대형 플랜지의 표면을 가공하는 장치로서,According to one aspect of the present invention, there is provided a surface processing apparatus for a large flange, wherein: an end pipe extending from an inner diameter portion of the flat flange is joined in a direction substantially perpendicular to the flat flange, such that When cutting axially "

Is a device for processing the surface of a large flange having a cross-sectional structure of ",

A rotation drive unit which rotates while compressing an outer circumference of the end pipe so that the large flange is rotated about an axis of the end pipe;

A first machining portion for machining the joint surface of the large flange;

First positioning means for adjusting the position such that the first machining portion is in contact with the joint surface of the large flange;

A second processing portion for processing the outer diameter surface of the large flange;

Second position adjusting means for adjusting the position such that the second machining portion contacts the outer diameter surface of the large flange;

And the first machining portion and the second machining portion joined by the first and second positioning jaw integer stages so that the first machining portion and the second machining portion can simultaneously process the joint surface and the outer diameter surface. Characterized in that can be in contact with the surface and the outer diameter surface at the same time.

In this case, the rotation drive unit:

An inner rotating part having a cylindrical shape and inserted into the end pipe in a direction parallel to an axial direction of the end pipe and contacting an inner diameter surface of the end pipe;

An outer rotating part having a cylindrical shape having a seating part on which the flat flange is placed on an upper surface thereof, the outer rotating part being disposed on the outer side in parallel with the axial direction of the end pipe and contacting the outer diameter surface of the end pipe;

It is preferable to have a.

In addition, it is preferable that the said 1st process part and the 2nd process part are any selected from the group which consists of a face cutter, grinder stone, and a wing pepper, respectively.

In addition, the first and second position adjusting means is preferably made of a hydraulic cylinder or a handle screw, respectively.

Moreover, it is preferable that the vibration reduction part which reduces the up-and-down vibration of the said large flange at the time of rotation of the said large flange around the said 1st process part is provided.

According to another aspect of the present invention for achieving the above technical problem is a flat surface processing apparatus of a large flange:

An apparatus for processing the surface of a large flat flange having an upper surface and a lower surface as joinable surfaces,

A rotation drive unit for rotating the large flange about an axis by rotating while inserting an outer circumference of the flange;

An upper surface processing portion for processing an upper surface of the large flange;

A lower surface processing portion for processing a lower surface of the large flange;

An outer diameter processing unit for processing an outer diameter surface of the large flange;

The upper surface, the lower surface and the outer diameter surface processing portion is the upper surface, the lower surface and the outer diameter surface processing portion by the respective position adjusting means so that the upper surface, the lower surface and the outer diameter surface processing portion at the same time to process the upper surface, the lower surface and the outer diameter surface Each of which is in contact with.

In this case, the rotation driving unit is composed of an inner insertion rotation and an outer insertion rotation, each of the inner insertion rotation and the outer insertion rotation:

A seating portion on which a lower surface of the outer side of the flat plate-type flange is mounted;

A latching jaw portion which allows the outer peripheral portion of the flat plate-type large flange to be caught and is integral with the seating portion;

A cover part covering an upper surface of the outer side of the flat plate-type large flange, the cover part being detachably fastened to the locking jaw part;

It is preferable to have a, it is more preferable to further include a distance adjusting means for adjusting the distance between the upper surface of the locking projection and the cover portion in accordance with the thickness of the flat plate-shaped flange is fixed.

According to the present invention described above, since several surfaces of the flange can be processed at the same time with high processing accuracy, work efficiency can be increased and product quality can be improved.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. This embodiment is not intended to limit the scope of the invention, but is presented by way of example only. Therefore, modifications obvious to those of ordinary skill in the art to which the present invention pertains should be interpreted as falling within the scope of the present invention.

[First Embodiment]

"의 단면구조를 갖게 된다. 이러한 대형 플랜지(100)의 접합면(102b)과 외경면(102a)을 동시에 가공하기 위한 본 발명의 플랜지 표면 가공장치는 접합면(102b)을 가공하기 위한 제1 가공부(120)와 외경면(102a)을 가공하기 위한 제2 가공부(110)를 포함한다. 또한, 엔드 파이프(104)의 외주부에는 외주부를 압착하면서 회전함으로써 대형 플랜지(100)가 엔드 파이프(104)의 축(A)을 중심으로 회전되도록 하는 회전 구동부에 해당하는 내측 회전부(150)와 외측 회전부(152)가 설치된다. 내측 회전부(150)는 실린더 형상을 하고 있으며 엔드 파이프(104)의 축(A) 방향과 나란한 방향으로 엔드 파이프(104)의 내측에 삽입되어 엔드 파이프(104)의 내경면에 접촉된다. 외측 회전부(152)는 그 상편에 평판 플랜지(102)가 놓이는 안착부를 가지는 실린더 형상을 하고 있으며, 엔드 파이프(104)의 축(A) 방향과 나란한 방향으로 외측에 설치되어 엔드 파이프(104)의 외경면에 접촉된다. 내측 회전부(150)와 외측 회전부(152)는 각각의 회전 기어(150a, 150b)에 의해 서로 맞물린 상태에서 회전할 수 있도록 되어 있으며, 회전동력원으로서 유압모터(170)가 마련되며, 회전속도는 감속기 등의 회전속도 제어장치(160)에 의해 제어된다. 한편, 장치의 하우징(105)의 외부에는 외측 회전부(152)의 회전축(152b)에 접속되는 유압 실린더(108)가 설치되어, D방향으로 외측 회전부(152)를 이동시켜서 엔드 파이프(104)의 두께에 맞춘 상태로 내측 회전부(150)와 외측 회전부(152) 사이에 대형 플랜지(100)를 끼울 수 있게 된다. 외측 회전부(152)의 회전축(152b)은 장치의 하우징(105)의 저면에 마련된 가이드홈(미도시)에 끼워진 상태에서 D방향으로 유압 실린더(108)에 의해 움직일 수 있게 된다. 본 실시예에서 내측 회전부(150)와 외측 회전부(152)의 축들(150b, 152b)은 회전 기어(150a, 150b)에 의해 서로 맞물려 회전하도록 구성되어 있으나, 반드시 이에 제한되는 것은 아니며 그 이외에도 동일한 기능을 발휘한다면 다른 부품을 사용할 수도 있다. 이와 같은 구조에 의해 본 장치에서는 회전 구동부가 대형 플랜지(100)의 엔드 파이프(104)의 압착하면서 회전함으로써 대형 플랜지(100)가 엔드 파이프(104)의 축(A)을 중심으로 회전할 수 있게 된다. 한편, 제1 가공부(120)는, 접합면(102b)에 직접 접촉하여 그 표면 거칠기를 매끄럽게 해주는 페이스 컷터(120a)와, 페이스 컷터(120a)를 고정시키면서 이와 접합면(102b) 사이의 거리를 B방향으로 조절해주는 개별적 위치 조정수단으로서 핸들 스크류(120b)가 포함되어 있다. 또한, 페이스 컷터(120a)의 양쪽에는 접합면(102b)과 탄성 접촉을 이룸으로써 대형 플랜지(100)의 회전 시에 그의 상하 진동을 저감시키는 진동 저감부(126)가 설치되어 있는데, 진동 저감부(126)는, 스프링(122)과, 일면은 접합면(102b)에 접촉되고 타면은 스프링(122)에 연결되어 상하방향으로 유격을 가지면서 움직일 수 있는 접촉 롤러(roller; 124)를 포함한다. 접촉 롤러(124)는 접합면(102b)에 접촉된 상태로 회전하면서 접합면(102b)의 상하방향의 큰 위치변동을 막아 줌으로써 진동 저감이라는 역할을 하게 된다. 진동 저감부(126)는 페이스 컷터(120a)와 함께 핸들 스크류(120b)에 고정되어 있으며 함께 상하방향으로 움직이게 된다. 평상시에 접촉 롤러(124)의 단부는 페이스 컷터(120a)의 단부보다 접합면(102b)에 더 근접하도록 위치조정이 되어 있으나, 가공 시에는 스프링(122)의 압축에 의해 페이스 컷터(120a)의 단부가 접합면(102b)에 접촉하여 접합면(102b)에 대한 가공 공정이 이루어지게 된다. 제2 가공부(110)는 대형 플랜지(100)의 측부로부터 C방향으로 외경면(102a)에 접촉하여 그 표면을 가공하기 위한 것으로서, 페이스 컷터(110a)와 핸들 스크류(110b)를 포함한다. 페이스 컷터(110a)와 핸들 스크류(110b)의 기능은 제 1 가공부(120)에 포함된 것들과 동일하므로 중복적인 설명은 생략한다. 본 실시예에서는 절삭가공을 하기 위해 페이스 컷터를 예로 들었으나, 그 이외에도 연마가공을 하기 위한 그라인더 돌 또는 날개 페퍼를 사용할 수도 있음은 물론이다. 또한, 본 실시예에서 페이스 컷터(110a, 120a)의 고정 및 위치 조절을 위해 핸들 스크류(110b, 120b)를 사용하였으나, 그 용도로서 유압 실린더를 사용할 수도 있다.1 is a cross-sectional view showing a schematic structure of a surface processing apparatus of a large flange according to a first embodiment of the present invention. Referring to FIG. 1, it can be seen that in the large flange 100 to be processed, the end pipe 104 extending from the inner diameter portion in a direction substantially perpendicular to the flat flange 102 is joined by welding or the like. The term "approximately vertical" is used here because the flat flange 102 and the end pipe 104 must be vertical after machining, but prior to machining due to poor joint angles and thermal deformation during welding. This is because it is often not a state. The large flange 100 to be machined is cut in the axial direction A of the end pipe 104.

The flange surface processing apparatus of the present invention for simultaneously processing the joint surface 102b and the outer diameter surface 102a of the large flange 100 has a first surface for processing the joint surface 102b. And a second processing portion 110 for processing the processing portion 120 and the outer diameter surface 102a. In addition, the large flange 100 is rotated by pressing the outer peripheral portion at the outer peripheral portion of the end pipe 104 by pressing the outer peripheral portion. The inner rotating part 150 and the outer rotating part 152 corresponding to the rotation drive part which are rotated about the axis A of 104 are provided. The inner rotating part 150 is cylindrical shape, and the end pipe 104 is carried out. The inner rotational surface of the end pipe 104 is inserted into the end pipe 104 in a direction parallel to the axis A direction of the outer pipe 104. The outer rotating portion 152 has a seating portion on which the flat flange 102 is placed. The branch has a cylindrical shape and the end pipe 104 It is provided on the outer side in the direction parallel to the axis A direction and is in contact with the outer diameter surface of the end pipe 104. The inner rotating part 150 and the outer rotating part 152 are engaged with each other by the respective rotating gears 150a and 150b. It can be rotated in a state, the hydraulic motor 170 is provided as a rotational power source, the rotational speed is controlled by a rotational speed control device 160 such as a speed reducer, etc. Meanwhile, outside the housing 105 of the device The hydraulic cylinder 108 connected to the rotation shaft 152b of the outer rotating part 152 is provided, and moves the outer rotating part 152 in the D direction to match the thickness of the end pipe 104 and the inner rotating part 150. The large flange 100 can be fitted between the outer rotating portions 152. The rotating shaft 152b of the outer rotating portions 152 is fitted with a guide groove (not shown) provided on the bottom of the housing 105 of the apparatus. Moveable by hydraulic cylinder 108 in the direction of In this embodiment, the shafts 150b and 152b of the inner rotating part 150 and the outer rotating part 152 are configured to rotate with each other by rotating gears 150a and 150b, but are not necessarily limited thereto. Other parts can be used if they do the same. With this structure, in this apparatus, the rotary drive rotates while pressing the end pipe 104 of the large flange 100 so that the large flange 100 can rotate about the axis A of the end pipe 104. do. On the other hand, the first machining portion 120 is in direct contact with the joint surface 102b, and the distance between the face cutter 120a and the joint surface 102b while fixing the face cutter 120a to smooth the surface roughness thereof. Handle screw (120b) is included as an individual position adjusting means for adjusting the B direction. In addition, vibration reduction parts 126 are provided on both sides of the face cutter 120a to make elastic contact with the joint surface 102b to reduce the vertical vibration thereof during the rotation of the large flange 100. 126 includes a spring 122 and a contact roller 124, the one surface of which is in contact with the mating surface 102b and the other surface of which is connected to the spring 122 and movable with a clearance in the vertical direction. . The contact roller 124 rotates in a state of being in contact with the bonding surface 102b to prevent a large positional change in the vertical direction of the bonding surface 102b, thereby playing a role of vibration reduction. The vibration reducing unit 126 is fixed to the handle screw 120b together with the face cutter 120a and moves up and down together. Normally, the end of the contact roller 124 is positioned to be closer to the joint surface 102b than the end of the face cutter 120a, but during processing, the face cutter 120a is compressed by the compression of the spring 122. An end part contacts the joining surface 102b so that a machining process for the joining surface 102b is performed. The second machining portion 110 is for contacting the outer diameter surface 102a in the C direction from the side of the large flange 100 and machining the surface thereof, and includes a face cutter 110a and a handle screw 110b. Since the functions of the face cutter 110a and the handle screw 110b are the same as those included in the first machining unit 120, redundant description thereof will be omitted. In the present embodiment, a face cutter is used as an example for cutting, but of course, a grinder stone or a wing pepper for grinding may also be used. In addition, although the handle screws 110b and 120b are used to fix and position the face cutters 110a and 120a in the present embodiment, a hydraulic cylinder may be used as the purpose.

"의 단면구조를 가지는 대형 플랜지의 접합면과 외경면을 동시에 정밀 가공할 수 있기 때문에 가공시간이 단축될 뿐 아니라 우수한 기밀성을 갖는 플랜지를 얻을 수 있다.Using the surface processing apparatus of the flange having such a structure, "

Since the joint surface and the outer diameter surface of the large flange having the cross-sectional structure of "

In addition, even when the flat flange 102 and the end pipe 104 deviate from each other at right angles due to heat deformation during initial fabrication or processing, the seating portion of the outer rotating part 152 based on the inner and outer diameters of the end pipe 104. Since the joining surface (upper surface) of the plate flange 102 to be placed is cut or polished, it is automatically aligned at right angles.

Second Embodiment

Figure 2a is a plan view showing a schematic structure of a surface processing apparatus of a plate-type large flange according to a second embodiment of the present invention. For the sake of clarity, FIG. 2A illustrates the positions of the upper surface processing portion 215, the lower surface processing portion 220, and the outer diameter surface processing portion 210 for processing the upper surface, the lower surface, and the outer diameter surface of the flat plate-type large flange 200. , The position of the rotation driving unit 230 is mainly shown, and the structures of the upper surface processing unit 215 and the lower surface processing unit 220 are simply shown, and the power transmission system of the inner insertion rotating unit 250 and the outer insertion rotating unit 252 is shown. Are omitted. 2A, it can be seen that the inner insertion rotation part 250 and the outer insertion rotation part 252 rotate by grasping one side end of the outer circumference of the flat plate-type large flange 200. In addition, the outer diameter surface processing portion 210 is for contacting the outer diameter surface of the flat plate-type large flange 200 to process the surface, and includes a face cutter (210a) and a handle screw (210b), 2 has the same structure as the processing unit (110). The upper surface processing portion 215 and the lower surface processing portion 220 also include a face cutter and a handle screw, respectively, but only the face cutter is shown in FIG.

FIG. 2B is a cross-sectional view illustrating the schematic structure of the surface processing apparatus of the flat plate type flange shown in FIG. 2A, taken along line E-E 'of FIG. 2A. For clarity of illustration, the outer diameter surface processing portion 210, the upper surface processing portion 215 and the lower surface processing portion 220 are shown in the side view form, the outer diameter surface processing portion 210 is shown only the face cutter (210a). . Referring to FIG. 2B, it can be seen that one side end of the outer circumference of the plate-type large flange 200 can be rotated while being inserted between the inner insertion rotation part 250 and the outer insertion rotation part 252. Two or more pairs of the inner insertion rotation part and the outer insertion rotation part may be installed, and each of the seating parts 250c and 252c on which the bottom surface of one side end of the outer part of the plate-type large flange 200 is seated, and the plate-type large flange The outer periphery of the (200) is hooked, and covers the upper surface of the outer side of the locking jaw portion (250d, 252d) and integrally formed with the seating portion (250c, 252c), the plate-type large flange 200, the locking jaw portion 250d And cover parts 250f and 252f detachably fastened to 252d. The fastening bolts 250e and 252e are installed on the cover parts 250f and 252f. When the flat plate-type large flange 200 becomes thicker, the fastening bolts 250e and 252e are further loosened so that the locking step parts 250d and 252d are provided. It is also possible to fix the thicker flat plate-type flange 200 by adjusting the distance between the top surface and each of the lid portions 250f and 252f. Accordingly, the fastening bolts 250e and 252e correspond to distance adjusting means for adjusting the distance between the upper surface of the locking jaw portion and the cover portion. The rotation shafts 250a and 252a of the inner insertion rotation part 250 and the outer insertion rotation part 252 are rotatable in engagement with each other by the rotation gears 250a and 250b, and rotate as in the case of the first embodiment. A hydraulic motor 170 is provided as a power source, and the rotation speed is controlled by the rotation speed control device 160 such as a speed reducer. In such a structure, when the flat plate-shaped flange 200 is rotated about its axis, the upper surface processing portion including the face cutters (215a, 220a) and the handle screws (215b, 220b) for fixing and positioning thereof ( Each of the upper and lower surfaces may be processed by the 215 and the lower surface processing unit 220. At the same time, the outer diameter surface can also be processed by the face cutter 210a included in the outer diameter surface processing portion 210. In FIG. 2B, for convenience of illustration, only the face cutter 210a is shown without the handle screw in the entire outer diameter surface processing portion placed on the front side.

Operation of the face cutter and the handle screw are the same as those described in the first embodiment, and thus redundant description thereof is omitted. In addition, it is obvious to replace these components with other parts performing the same function, such as grinder stones, vane pepper, or hydraulic cylinders. Also in the case of the upper surface processing unit 215 and the lower surface processing unit 220, as shown in Figure 1 may also include a vibration reducing unit.

In addition, the hydraulic cylinder connected to the rotary shaft 252b of the outer insertion rotary part 252 in the process of inserting one end of the outer peripheral portion of the flat-type large flange 200 between the inner insertion rotary part 250 and the outer insertion rotary part 252. The use of 108 is the same as that of the first embodiment, in which case the rotary shaft 252b of the outer insertion rotary part 252 is fitted in a guide groove (not shown) provided in the bottom of the housing 105 of the apparatus. It can be moved by the hydraulic cylinder 108 in the D direction.

1 is a cross-sectional view showing the schematic structure of a surface processing apparatus of a large flange according to a first embodiment of the present invention;

Figure 2a is a plan view showing a schematic structure of a surface processing apparatus of a plate-type large flange according to a second embodiment of the present invention; And

FIG. 2B is a cross-sectional view illustrating the schematic structure of the surface processing apparatus of the flat plate type flange shown in FIG. 2A, taken along line E-E 'of FIG. 2A.

Explanation of symbols on the main parts of the drawings

110a, 120a, 210a, 215a, 220a: face cutter

110b, 120b, 210b, 215b, 220b: handle screw

122: spring

124: contact roller

126: vibration reduction unit

150: inner rotating part

152: outer rotating part

160: speed control device

170: hydraulic motor

250: inner insertion rotating part

252: outer insertion rotation

Claims (8)

When the end pipes extending from the inner diameter of the plate flange in a direction substantially perpendicular to the plate flange are joined and cut in the axial direction of the end pipe.

In the apparatus for processing the surface of a large flange having a cross-sectional structure of ", A rotation drive unit which rotates while compressing an outer circumference of the end pipe so that the large flange is rotated about an axis of the end pipe; A first machining portion for machining the joint surface of the large flange; First positioning means for adjusting the position such that the first machining portion is in contact with the joint surface of the large flange; A second processing portion for processing the outer diameter surface of the large flange; Second position adjusting means for adjusting the position such that the second machining portion contacts the outer diameter surface of the large flange; And the first machining portion and the second machining portion by the first and second position adjusting means so that the first machining portion and the second machining portion can simultaneously process the joint surface and the outer diameter surface. And a large flange surface processing apparatus, which may be in contact with the outer diameter surface at the same time. The method of claim 1, wherein the rotation drive unit: An inner rotating part having a cylindrical shape and inserted into the end pipe in a direction parallel to an axial direction of the end pipe and contacting an inner diameter surface of the end pipe; An outer rotating part having a cylindrical shape having a seating part on which the flat flange is placed on an upper surface thereof, the outer rotating part being disposed on the outer side in parallel with the axial direction of the end pipe and contacting the outer diameter surface of the end pipe; Surface processing apparatus of a large flange comprising a. The surface processing apparatus according to claim 1, wherein the first processing portion and the second processing portion are any one selected from the group consisting of a face cutter, a grinder stone, and a wing pepper, respectively. The surface processing apparatus for a large flange according to claim 1, wherein the first and second position adjusting means each comprise a hydraulic cylinder or a handle screw. The surface processing apparatus for a large flange according to claim 1, wherein a vibration reduction unit for reducing the vertical vibration of the large flange is provided around the first machining portion when the large flange is rotated. In the apparatus for processing the surface of the flat plate-type large flange having the upper surface and the lower surface as joinable surface, A rotation drive unit for rotating the large flange about an axis by rotating while inserting an outer circumference of the flange; An upper surface processing portion for processing an upper surface of the large flange; A lower surface processing portion for processing a lower surface of the large flange; An outer diameter processing unit for processing an outer diameter surface of the large flange; The upper surface, the lower surface and the outer diameter surface processing portion is the upper surface, the lower surface and the outer diameter surface processing portion by the respective position adjusting means so that the upper surface, the lower surface and the outer diameter surface processing portion at the same time to process the upper surface, the lower surface and the outer diameter surface Surface treatment apparatus for a plate-type large flange, characterized in that each in contact with. 7. The rotary insert of claim 6, wherein the rotary drive comprises an inner insertion rotation and an outer insertion rotation, each of the inner insertion rotation and the outer insertion rotation: A seating portion on which a lower surface of the outer side of the flat plate-type flange is mounted; A latching jaw portion which allows the outer peripheral portion of the flat plate-type large flange to be caught and is integral with the seating portion; A cover part covering an upper surface of the outer side of the flat plate-type large flange, the cover part being detachably fastened to the locking jaw part; Surface processing apparatus for a plate-type large flange characterized in that it comprises a. 8. The surface processing apparatus of claim 7, further comprising a distance adjusting means for adjusting a distance between the upper surface of the latching jaw and the cover part according to the thickness of the flat plate-type flange to be fixed. .

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