KR20200124916A - Grinding device and method for welding portion of drum mixer - Google Patents

Abstract

Provided are a grinding device and a grinding method for a welded portion of a drum mixer which can reduce the vibration of a drum mixer by accurately grinding a surface of a welded portion to have the same cylindrical and longitudinal flatness as the rest portion of a ride ring in a process of grinding after the ride ring of the drum mixer is repaired and welded and which can prevent the malfunction of a facility due to the vibration. The grinding device for a welded portion of a drum mixer comprises a pair of curved frames, a horizontal transfer part, a vertical transfer part, and a grinding machine. The pair of curved frames is separated from each other with the welded portion therebetween, is attached to the ride ring in a circumferential direction of the ride ring, and comprises an arc-shaped guide hole. The horizontal transfer part includes a horizontal frame installed between the pair of curved frames to be connected, and a horizontal moving block coupled to the horizontal frame. The vertical transfer part includes a vertical rail fixed on the horizontal moving block and a grinding machine holder coupled to the rail. The grinding machine is coupled to the grinding machine holder and enables vertical, horizontal, and circumferential movement on the ride ring.

Description

Grinding device and polishing method of welding part of drum mixer {GRINDING DEVICE AND METHOD FOR WELDING PORTION OF DRUM MIXER}

The present invention relates to a sintering drum mixer, and more particularly, to an apparatus and method for polishing a welded portion of a drum mixer ride ring.

In ironworks, iron ore is produced as a lump-shaped sintered ore and fed into the blast furnace. The process of manufacturing iron ore into a sintered ore is a process of mixing iron ore and auxiliary raw materials (limestone, silica stone, quicklime) and raw materials (coke, semi-gwang) in a drum mixer to prepare a sintering blended material, and a sintering machine bogie with upper ore supplied Including the process of charging the sintering compounding material to the sintering compound, heating the surface of the sintering compounding material and burning the coke to cause a sintering reaction.

The drum mixer is installed in a horizontal direction so as to be parallel to the ground and rotates in a circumferential direction by a driving device. In addition, support rollers are installed under both ends of the drum mixer, and a ride ring is installed in the circumferential direction at a portion of the drum mixer that abuts the support roller. However, in the ride ring, a spalling phenomenon in which cracks grow after a crack occurs due to a contract stress with the support roller may occur.

The cracks generated in the ride ring develop into cracks and lead to surface peeling where the surface falls off, and the surface peeling area increases with time. When a surface peeling part is formed on the ride ring, vibration occurs in the drum mixer, causing vibration of the driving device, leading to equipment failure. Therefore, in the field, the operator repairs and welds the surface peeling portion of the ride ring, and then polishes the weld using a hand grinder.

However, in the manual polishing operation of the welding portion, it is difficult to accurately polish the cylindricalness (curvature along the circumferential direction) and flatness (flatness along the length direction) of the welding portion to the rest of the ride ring. If the cylindricalness and flatness of the welding part are different from the rest of the ride ring, the vibration is not reduced and rises even after the ride ring is repaired, which may cause a failure of the driving device.

The present invention reduces vibration of the drum mixer by accurately polishing the surface of the welded portion to have the same cylindricality and flatness as the rest of the ride ring in the process of repairing and then polishing the ride ring of the drum mixer. It is intended to provide an apparatus and polishing method for welding welds of drum mixers that can prevent equipment failure.

An apparatus for polishing a welding part of a drum mixer according to an embodiment of the present invention includes a pair of curvature frames, a horizontal conveying part, a vertical conveying part, and a polishing machine. A pair of curvature frames are spaced apart from each other along the length direction of the drum mixer with the weld between them, and are in close contact with the ride ring along the circumferential direction of the ride ring, and an arc-shaped guide hole that shares the center of curvature with the ride ring is formed. do. The horizontal transfer unit includes a horizontal frame connected to and installed between a pair of curvature frames so as to be movable in a circumferential direction along the guide hole, and a horizontal frame parallel to the length direction, and a horizontal moving block moving in a horizontal direction on the horizontal frame. The vertical transfer unit includes an upper and lower rail fixed to the horizontal moving block, and a processing machine holder that moves up and down on the upper and lower rails. The grinding machine includes a grinding wheel coupled to the processing machine holder and a driving unit for rotating the grinding wheel, and can move up and down, horizontally and circumferentially with respect to the ride ring.

The pair of curvature frames may be erected perpendicular to the surface of the ride ring, and may be integrally coupled by a plurality of connecting rods connected to both ends. A pair of curvature frames and a plurality of connecting rods may surround the weld.

A plurality of flanges may be connected to both ends of the horizontal frame, and a movable pin penetrating through a guide hole may be installed for each of the plurality of flanges to couple the horizontal frame and the curvature frame. The movable pin may include a pin shaft penetrating through the guide hole and movable along the guide hole, and a pin head coupled to an end of the pin shaft and located outside the curvature frame and having a diameter greater than a vertical width of the guide hole.

The horizontal transfer unit may further include a horizontal rail fixed to one surface of the horizontal frame. The horizontal movable block may be coupled to the horizontal rail so as to be slidable along the horizontal rail. The upper and lower transfer unit may further include a vertical movement block coupled to the upper and lower rails so as to be slidable along the upper and lower rails. The processing machine holder may be fixed to the vertical movement block, and may include a hollow parallel to the horizontal direction.

The vertical transfer unit may further include a position control unit for adjusting the vertical position of the processing machine holder. The position adjustment unit may include a nut portion fixed to the upper end of the upper and lower rails, a screw portion fastened to the nut portion and fixed to the upper side of the processing machine holder, and an adjustment handle fixed to the upper end of the screw portion. The driving unit of the polishing machine may include a drive motor and a rotation shaft, and the rotation shaft may be coupled to the hollow of the machine holder via a bearing.

A method of polishing a welding portion of a drum mixer according to an embodiment of the present invention includes the installation step of a polishing apparatus in which a pair of curvature frames are arranged in close contact with the ride ring along the circumferential direction of the ride ring, and the vertical transfer portion is used. Thus, the position adjustment step in which the vertical position of the polishing machine is adjusted, the first polishing step in which the polishing machine moves in one of the horizontal and circumferential directions to polish the weld, and the polishing machine is the other one of the horizontal and circumferential directions. And a second polishing step of polishing the weld while moving in the direction.

In the polishing apparatus installation step, a pair of curvature frames may be integrally coupled by a plurality of connecting rods connected to both ends, and a pair of curvature frames and a connecting rod may surround the welding portion in a square shape.

In the position adjustment step, the screw portion may be fixed to the upper side of the processing machine holder, the screw portion may be fastened to a nut portion installed at the upper end of the upper and lower rail, and the adjustment handle may be coupled to the upper end of the screw portion. By the rotation of the adjustment handle, the machine holder moves in the vertical direction, and the vertical position of the polishing machine can be adjusted.

In the first polishing step, the polishing machine may polish the weld by moving along the horizontal direction, and in the second polishing step, the polishing machine may polish the weld by moving along the circumferential direction.

In the first polishing step, the polishing machine, the vertical transfer unit and the horizontal moving block can reciprocate in the horizontal direction on the horizontal frame, and in the second polishing step, the polishing machine, the vertical transfer unit and the horizontal transfer unit can reciprocate in the circumferential direction along the guide hole. have.

According to the polishing apparatus and polishing method of the present embodiment, it is possible to easily secure the flatness and cylindricality of the welded portion, and precisely polish the surface of the welded portion so that the welded portion has the same flatness and cylindricality as the rest of the ride ring. Accordingly, vibration of the drum mixer after repair of the ride ring can be reduced, and equipment failure due to vibration can be prevented.

1 is a schematic perspective view showing a typical drum mixer.
2 is a perspective view showing a state in which a polishing apparatus according to an embodiment of the present invention is installed on a ride ring.
3 is a perspective view of the polishing apparatus shown in FIG. 2.
4 is a schematic diagram of the ride ring and the curvature frame shown in FIG. 2.
5 is a partially enlarged view of the polishing apparatus shown in FIG. 2.
6 is an exploded perspective view of the polishing apparatus shown in FIG. 5.
7 is a flow chart showing a method of polishing a welding part of a drum mixer according to an embodiment of the present invention.
8 is a photograph of a process in which the polishing apparatus of this embodiment is installed on a ride ring.
9 is a photograph of a process of adjusting the polishing machine.
10 is a photograph taken of a processing operation of a welding part using a polishing processing machine.
11 is a photograph of a process of first inspecting a welding part using illumination after polishing.
12 is a schematic diagram in which vibration measurement positions ① to ⑥ are added in the drum mixer shown in FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms, and is not limited to the embodiments described herein.

1 is a schematic perspective view showing a typical drum mixer.

Referring to FIG. 1, the sintering drum mixer 10 is an apparatus for producing a sintering blended raw material by mixing iron ore and auxiliary raw materials (limestone, silica stone, quicklime, etc.) and raw materials (coke, semi-gloss). The drum mixer 10 is rotated by a drive device 15 composed of a motor 11, a reducer 12, a pinion gear 13, and a girth gear 14, and is supported by a plurality of support rollers 16. do.

The sintering drum mixer 10 includes a ride ring 17 installed at a portion in contact with the support roller 16, and the ride ring 17 may cause cracks due to contact stress, and cracks may be caused by cracks and surface peeling. It follows. In the field, the operator forms the welding part 18 on the surface peeling part of the ride ring 17 and then performs polishing.

The welding part 18 must be polished to have the same cylindricalness (curvature along the circumferential direction) and flatness (flatness along the length direction of the drum mixer) as the rest of the ride ring 17 to prevent vibration of the drum mixer 10. Does not cause The welding part grinding device of the drum mixer (hereinafter, referred to as'polishing device' for convenience), which will be described below, polishes the weld part 18 so that the weld part 18 has the same cylindricality and flatness as the rest of the ride ring 17. Functions to do.

FIG. 2 is a perspective view showing a state in which a polishing apparatus according to an embodiment of the present invention is installed on a ride ring, and FIG. 3 is a perspective view of the polishing apparatus shown in FIG. 2.

2 and 3, the polishing apparatus 100 of this embodiment includes a pair of curvature frames 20 and a pair of curvature frames that are in close contact with the ride ring 17 with a welding part 18 therebetween. (20) It includes a horizontal transfer unit 30 connected between the installed, the vertical transfer unit 40 coupled to the horizontal transfer unit 30, and a polishing machine 50 coupled to the vertical transfer unit 40. The polishing machine 50 is capable of vertical movement, horizontal movement, and circumferential movement.

A pair of curvature frames 20 are spaced apart from each other along the longitudinal direction (A direction) of the drum mixer 10 with the welding part 18 interposed therebetween, and along the circumferential direction (B direction) of the ride ring 17 It is in close contact with the ride ring 17. The curvature of the bottom surface of the curvature frame 20 coincides with the curvature of the ride ring 17, and each curvature frame 20 is made of an arc-shaped metal plate erected perpendicular to the surface of the ride ring 17.

The pair of curvature frames 20 may be integrally coupled by a plurality of connecting rods 21. The plurality of connecting rods 21 are located at both ends of the pair of curvature frames 20 so as not to interfere with the movement of the polishing machine 50, and may be located at the upper and lower sides of each of both ends. A pair of curvature frames 20 and a plurality of connecting rods 21 surround the welding portion 18 that needs to be polished in a square shape.

Each of the pair of curvature frames 20 has an arc-shaped guide hole 22 that shares the center of curvature with the ride ring 17. 4 is a schematic diagram of the ride ring and the curvature frame shown in FIG. 2. 4, the guide hole 22 is parallel to the circumferential direction (B direction) of the ride ring 17, and the center of curvature (C) of the guide hole 22 is the center of curvature (C) of the ride ring (17). ) Matches.

Referring back to FIGS. 2 and 3, the horizontal transfer part 30 is connected between a pair of curvature frames 20 so as to be movable in the circumferential direction (B direction) of the ride ring 17 along the guide hole 22 It includes a horizontal frame 31 installed, and a horizontal rail 32 fixed to one surface of the horizontal frame 31. The horizontal frame 31 and the horizontal rail 32 are parallel to the length direction (A direction) of the drum mixer. In this embodiment, the'horizontal direction' means the'length direction' of the drum mixer.

The horizontal frame 31 is located between a pair of curvature frames 20 and is made of a straight metal plate erected perpendicular to the surface of the ride ring 17. A plurality of flanges 33 extending in both directions are connected to both ends of the horizontal frame 31 so that the ends of the horizontal frame 31 form a tee (T) shape, and a movable pin for each of the plurality of flanges 33 34 is installed and coupled to the curvature frame 20.

The movable pin 34 includes a pin shaft 341 passing through the guide hole 22 and a pin head 342 that is coupled to an end of the pin shaft 341 and is located outside the curvature frame 20. The pin shaft 341 is made smaller than the vertical width of the guide hole 22 so that the horizontal frame 31 can move along the guide hole 22, and the pin head 342 is the vertical width of the guide hole 22 It is made larger so that the horizontal frame 31 does not deviate from the curvature frame 20.

5 is a partially enlarged view of the polishing apparatus shown in FIG. 2, and FIG. 6 is an exploded perspective view of the polishing apparatus shown in FIG.

Referring to FIGS. 5 and 6, the horizontal transfer unit 30 includes a horizontal moving block 35 coupled to the horizontal rail 32 so as to slide along the horizontal rail 32. The horizontal rail 32 and the horizontal moving block 35 may be coupled in a protrusion-groove manner. For example, a first linear groove 321 may be located on both upper and lower sides of the horizontal rail 32, and the horizontal moving block 35 is a pair of first linear grooves 321 fitted into the pair of first linear grooves 321. It may include one protrusion 351.

The vertical transfer unit 40 includes an upper and lower rail 41 coupled to the horizontal moving block 35, a vertical moving block 42 coupled to the upper and lower rail 41 so as to slide along the upper and lower rail 41, and It may include a processing machine holder 43 fixed to the moving block 42, and a position adjusting unit 44 for adjusting the vertical position of the processing machine holder 43. In this embodiment, the'up-down direction' coincides with the radial direction (direction extending in all directions from the center) of the drum mixer.

The lower end of the upper and lower rails 41 may be fixed to the horizontal moving block 35, and the upper and lower rails 41 and the upper and lower moving blocks 42 may be coupled in a protrusion-groove manner. For example, the second linear grooves 411 may be located on both left and right sides of the upper and lower rails 41, and the vertical movement block 42 is a pair of second linear grooves 411 that are inserted into a pair of second linear grooves 411. It may include two protrusions 421.

The processing machine holder 43 is fixed to the vertical movement block 42 and moves with the vertical movement block 42. In the processing machine holder 43, a hollow 431 penetrating the processing machine holder 43 may be positioned along a horizontal direction for installation of the polishing machine 50.

The position adjustment part 44 includes a nut part 45 fixed to the upper end of the upper and lower rail 41, a screw part 46 fastened to the nut part 45 and fixed to the processing machine holder 43, and a screw part 46 ) May include an adjustment handle 47 fixed to the upper end. The lower end of the threaded portion 46 is fixed to the processing machine holder 43, and the threaded portion 46 is positioned parallel to the vertical direction.

When the screw part 46 is rotated using the adjustment handle 47, the screw part 46 moves upward or downward according to the rotation direction, and the processing machine holder 43 moves in the vertical direction along the screw part 46. The vertical position of the machine holder 43 can be freely adjusted by the operation of the position adjustment unit 44.

The grinding machine 50 may include a wheel-shaped grinding wheel 51 and a driving unit 52 for rotating the grinding wheel 51. The driving unit 52 may be composed of a driving motor 53 and a rotating shaft 54, and half of the grinding wheel 51 may be surrounded by a cover 55. The cover 55 prevents sparks generated during polishing from splashing in the direction of a worker.

The rotating shaft 54 may be fitted into the hollow 431 of the processing machine holder 43 via a bearing (not shown) and coupled to the processing machine holder 43. The entire polishing machine 50 is fixedly installed on the machine holder 43 in a state parallel to the horizontal direction.

The polishing machine 50 may be moved in the vertical direction by the position adjusting part 44 to adjust the distance between the polishing wheel 51 and the welding part 18. In addition, the polishing machine 50 and the vertical transfer unit 40 can be moved in a horizontal direction along the horizontal rail 32, and the polishing machine 50, the vertical transfer unit 40, and the horizontal transfer unit 30 all have a curvature frame ( It can move in the circumferential direction of the ride ring 17 along the guide hole 22 formed in 20).

As a result, the polishing machine 50 is rigidly supported by the horizontal frame 31 on the welding portion 18 surrounded by the pair of curvature frames 20 and the plurality of connecting rods 21, while moving vertically and horizontally. And circumferential movement is free.

At this time, the horizontal movement of the grinding machine 50 coincides with the longitudinal direction of the drum mixer 10 by the horizontal rail 32, and the circumferential movement of the grinding machine 50 is performed by the guide hole 22. It coincides with the circumferential direction of 17). Accordingly, when polishing the welded portion 18 using the polishing machine 50, the welded portion 18 can easily have the same flatness and cylindricalness as the rest of the ride ring 17.

7 is a flow chart showing a method of polishing a welding part of a drum mixer according to an embodiment of the present invention.

Referring to FIG. 7, the welding method includes a first step (S10) in which the polishing device of the above-described configuration is installed on the weld, and a second step (S20) of adjusting the vertical position of the grinding wheel using the vertical transfer part. , A third step (S30) in which the polishing machine moves in one of a horizontal direction and a circumferential direction to polish the weld, and a fourth step in which the polishing machine moves in the other direction of a horizontal direction and a circumferential direction to polish the weld It includes (S40).

Referring to FIGS. 2 to 7, in the first step S10, the polishing apparatus 100 is installed around the welding part 18 that is required to be polished. Specifically, the pair of curvature frames 20 are disposed to be spaced apart from each other along the length direction (A direction) of the drum mixer with the welding portion 18 interposed therebetween, and the pair of curvature frames 20 and a plurality of connecting rods ( 21) surrounds the weld 18 in a square shape. At this time, since the curvature of the bottom surface of the curvature frame 20 coincides with the curvature of the ride ring 17, the polishing apparatus 100 can be mounted on the ride ring 17 without shaking.

In the second step (S20), while the polishing machine 50 is moved along the upper and lower rails 41 by the position adjustment unit 44, the vertical position of the polishing stone 51 is adjusted. Specifically, the operator can precisely adjust the height of the grinding wheel 51 by turning the adjustment handle 47 to raise or lower the processing machine holder 43.

In the third step (S30), the polishing machine 50 moves in one of a horizontal direction (A direction) and a circumferential direction (B direction), and moves the welding part 18 in the horizontal direction using the grinding wheel 51. Polish. In the fourth step (S40), the polishing machine 50 moves in the other direction of the horizontal direction and the circumferential direction, and grinds the welding part 18 in the circumferential direction using the grinding wheel 51.

When the polishing machine 50 polishes the welding part 18 in the horizontal direction, the welding part 18 can maintain the same flatness as the rest of the ride ring 17. In addition, when the polishing machine 50 polishes the welded portion 18 in the circumferential direction, the welded portion 18 can maintain the same cylindrical degree as the rest of the ride ring 17.

On the other hand, while the polishing machine 50 polishes the welding part 18 in the horizontal direction, roughness according to the circumferential direction may occur, and in the process of polishing the welding part 18 in the circumferential direction, the polishing machine 50 Roughness may occur according to. When the drum mixer is restarted after the welding part 18 is repaired, the roughness in the circumferential direction of the ride ring 17 may have a greater influence on the vibration than the roughness in the horizontal direction.

Therefore, in the third step (S30), the polishing machine 50 moves in the horizontal direction and polishes the welding part 18 in the horizontal direction, and then in the fourth step (S40), the polishing machine 50 moves in the circumferential direction. Polishing (18) in the circumferential direction may help to reduce the roughness along the circumferential direction of the weld (18).

FIG. 8 is a photograph of a process in which the polishing apparatus of this embodiment is installed on a ride ring, and FIG. 9 is a photograph of a process of adjusting the polishing machine. FIG. 10 is a photograph of a processing operation of a welding part using a polishing machine, and FIG. 11 is a photograph of a process of first inspecting a welding part using illumination after polishing. In FIG. 11, a red circle indicates an inspection area.

Table 1 below shows the results of measuring the vibration of the drum mixer after polishing the welding part using the polishing apparatus of this embodiment. And FIG. 12 is a schematic diagram in which vibration measurement positions ① to ⑥ are added in the drum mixer shown in FIG. 1. Vibration measurement positions ① and ② are reducers, ③ and ④ are support rollers, and ⑤ and ⑥ are support rollers.

Measure ① ② ③ ④ ⑤ ⑥ No load
trial run H(mm/s) 1.2 1.2 1.8 2.2 2.5 3.3 V(mm/s) One 1.5 3.2 2 3.1 2.2 A(mm/s) 0 0 2.2 2.1 3.1 4.2 Temperature(℃) - - - - - - Load
driving H(mm/s) 1.4 1.3 2.9 3 3.4 3.4 V(mm/s) 1.4 1.1 2 2.3 3.2 2.9 A(mm/s) 0.7 0.9 3.2 2.2 3.3 1.5 Temperature(℃) 54 63 30 24 24 23

In Table 1, H is the vibration speed in the horizontal direction, V is the vibration speed in the vertical direction, and A is the vibration speed of the base surface of the measurement location. Polishing the weld manually without using the polishing apparatus of this embodiment In the case of one comparative example, the vibration value of the drum mixer was measured to be 9.8 mm/s. On the other hand, as shown in Table 1, in the case of the example in which the welding portion was polished using the polishing apparatus of the example, it can be seen that the vibration value decreased to 3.4 mm/s at the vibration measurement positions ⑤ and ⑥ in contact with the ride ring.

According to the polishing apparatus and method of the present embodiment, it is possible to easily secure the flatness and the cylindricalness of the welded portion 18, and the welded portion 18 may have the same flatness and cylindricality as the rest of the ride ring 17. 18) Surface can be precisely polished. Therefore, it is possible to reduce the vibration of the drum mixer after the ride ring 17 is repaired, and to prevent equipment failure due to vibration.

In the above, preferred embodiments of the present invention have been described, but the present invention is not limited thereto, and it is possible to implement various modifications within the scope of the claims, the detailed description of the invention, and the accompanying drawings. It is natural to fall within the scope of

10: drum mixer 17: ride ring
18: welding part 100: welding part polishing device
20: curvature frame 22: guide hole
30: horizontal transfer unit 31: horizontal frame
32: horizontal rail 35: horizontal moving block
40: upper and lower transfer part 41: upper and lower rail
42: vertical moving block 43: processing machine holder
44: position control unit 50: grinding machine
51: grinding wheel 52: drive unit
55: cover

Claims (13)

A pair of curvature frames spaced apart from each other along the length direction of the drum mixer with the welding part therebetween, in close contact with the ride ring along the circumferential direction of the ride ring, and having an arc-shaped guide hole sharing the center of curvature with the ride ring;
A horizontal transfer unit connected to and installed between the pair of curvature frames so as to be movable in the circumferential direction along the guide hole, a horizontal frame parallel to the longitudinal direction, and a horizontal moving block moving in a horizontal direction on the horizontal frame;
An up-and-down transfer unit including an up-and-down rail fixed to the horizontal movement block and a processing machine holder moving in an up-down direction on the up-and-down rail; And
A grinding machine that includes a grinding wheel coupled to the processing machine holder and a driving unit that rotates the grinding wheel, and is capable of vertical movement, horizontal movement, and circumferential movement with respect to the ride ring;
A welding device for polishing a drum mixer comprising a. The method of claim 1,
The pair of curvature frames are erected perpendicular to the surface of the ride ring and are integrally coupled by a plurality of connecting rods connected to both ends,
A welding part polishing apparatus of a drum mixer in which the pair of curvature frames and the plurality of connecting rods surround the welding part. The method of claim 1,
A plurality of flanges are connected to both ends of the horizontal frame,
Each of the plurality of flanges is provided with a movable pin penetrating the guide hole to couple the horizontal frame and the curvature frame. The method of claim 3,
The movable pin includes a pin shaft that passes through the guide hole and is movable along the guide hole, and a pin head coupled to an end of the pin shaft and located outside the curvature frame and having a diameter greater than a vertical width of the guide hole. A device for polishing a welding part of a drum mixer including. The method of claim 1,
The horizontal transfer unit further includes a horizontal rail fixed to one surface of the horizontal frame,
The horizontal movable block is coupled to the horizontal rail so as to be slidable along the horizontal rail. The method of claim 1,
The vertical transfer unit further includes a vertical movement block coupled to the upper and lower rails so as to be slidable along the upper and lower rails,
The processing machine holder is fixed to the vertical movement block and includes a hollow in parallel with the horizontal direction. The method of claim 6,
The vertical transfer unit further includes a position adjustment unit for adjusting the vertical position of the processing machine holder,
The position adjusting part is a welding part of a drum mixer including a nut part fixed to an upper end of the upper and lower rails, a screw part fastened to the nut part and fixed to an upper side of the processing machine holder, and an adjustment handle fixed to an upper end of the screw part Polishing device. The method of claim 6,
The driving unit of the polishing machine includes a driving motor and a rotating shaft,
The rotating shaft is a welding part polishing apparatus of a drum mixer coupled to the hollow of the processing machine holder via a bearing. A method of polishing a welding part of a drum mixer using the polishing device of claim 1,
A polishing apparatus installation step in which the pair of curvature frames are disposed in close contact with the ride ring along the circumferential direction of the ride ring with the welding portion therebetween;
A position adjustment step of adjusting the vertical position of the polishing machine by using the vertical transfer unit;
A first polishing step of polishing the welding portion while the polishing machine moves in one of the horizontal direction and the circumferential direction; And
A second polishing step of polishing the weld while the polishing machine moves in the other direction of the horizontal direction and the circumferential direction;
A method of polishing a welding part of a drum mixer comprising a. The method of claim 9,
In the polishing apparatus installation step, the pair of curvature frames are integrally coupled by a plurality of connecting rods connected to both ends, and the pair of curvature frames and the connecting rod surround the welding part in a square shape. How to polish the welding part of the. The method of claim 9,
In the position adjustment step, a screw portion is fixed to an upper side of the processing machine holder, the screw portion is fastened to a nut portion installed at an upper end of the upper and lower rail, and an adjustment handle is coupled to an upper end of the screw portion,
A method of polishing a welding portion of a drum mixer, wherein the processing machine holder moves in an up-down direction by rotation of the adjustment handle and the vertical position of the polishing machine is adjusted. The method of claim 9,
In the first polishing step, the polishing machine moves along the horizontal direction and polishes the weld,
In the second polishing step, the polishing machine is moved along the circumferential direction to polish the welding part. The method of claim 12,
In the first polishing step, the polishing machine, the vertical transfer unit, and the horizontal movement block reciprocate in a horizontal direction on the horizontal frame,
In the second polishing step, the polishing machine, the vertical transfer part, and the horizontal transfer part reciprocate in the circumferential direction along the guide hole.

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