Surface processing device for turbine blade of gas turbine

Abstract

The invention discloses a surface machining device for a turbine blade of a gas turbine, and aims to solve the technical problem that the working efficiency of a polishing device is reduced due to the fact that the current turbine blade needs to be fixed through a special mold during polishing. A clamping mechanism used for clamping turbine blades is arranged above the base. A leveling mechanism used for enabling turbine blades to be in a horizontal state is arranged above the base. A limiting conveying mechanism used for conveying turbine blades is arranged above the first track plate. The turbine blades in different shapes are clamped through a plurality of groups of plug-ins to form a profiling shape, so that a large stress area can be formed, the turbine blades are stably clamped, and a special mold is not needed to fix the turbine blades, so that the problems that the stress area is relatively small, the turbine blades are easy to shake in the polishing process, and the machining efficiency is low are solved. Or the turbine blade needs to be fixed through a special mold during polishing, so that the working efficiency of the polishing device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of turbine blade production, and more specifically, to a surface processing device for gas turbine turbine blades. Background Art

[0002] Gas turbine blades are key components in gas turbines. Their main function is to guide high-temperature and high-pressure gas to flow in a specific direction, and through this flow, convert thermal energy into mechanical energy to drive the turbine to rotate. Turbine blades are usually divided into stationary blades (installed on the casing) and moving blades (installed on the rotor). Moving blades are the parts that directly contact the gas and convert energy into mechanical energy, so they are subject to extremely high temperatures and pressures, as well as the resulting stress and corrosion.

[0003] The surface processing of turbine blades includes a polishing process. The existing polishing device clamps the turbine blades by arranging a clamping device on the mechanical arm and controlling the distance between two sets of clamps, and then polishes them with a polishing tool. However, when the existing device clamps with two sets of clamps, when the outer surface of the fixing part of the turbine blade is irregular, the clamp can only fix the turbine blade by clamping the cross plate. The force-bearing area of ​​the cross plate is small, which can easily cause the turbine blade to shake during the polishing process, thereby causing the accuracy of the polished turbine blade to decrease. Since the accuracy requirements of the turbine blades are very high, the turbine blades need to be fixed by a special mold during polishing, which reduces the working efficiency of the polishing device.

[0004] Therefore, in order to solve the above technical problems, the present application proposes a surface processing device for gas turbine turbine blades. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a surface processing device for gas turbine turbine blades to solve the technical problem that the current turbine blades need to be fixed by a special mold during polishing, resulting in reduced working efficiency of the polishing device.

[0006] To achieve the above object, the present invention provides the following technical solution: A surface processing device for a gas turbine blade includes a base, one side of the base is connected to a first track plate;

[0007] A clamping mechanism for clamping turbine blades is provided above the base;

[0008] A leveling mechanism for placing the turbine blades in a horizontal state is provided above the base;

[0009] A position limiting conveying mechanism for conveying turbine blades is provided above the first track plate;

[0010] The clamping mechanism comprises a plurality of groups of plug-ins, and one end of each of the plurality of groups of plug-ins is connected to a spring.

[0011] The present invention further illustrates that the limiting conveying mechanism includes a mounting plate, a conveyor belt is installed on the top of the mounting plate, both sides of the top of the mounting plate are respectively connected to a vertical plate and a first limiting member, one side of the vertical plate is connected to a second limiting member, the second limiting member is located above the conveyor belt, and a chamfer is provided on the top of the first limiting member, and an edge with a lower chamfer height is on the same plane as the upper surface of the conveyor belt.

[0012] The present invention further illustrates that a disconnection is provided in the middle section of the first limiting member, and the bottom of the disconnection is connected to a shell, and the shell is a shell which is hollow inside and open at the top, and a lifting device is provided inside the shell, and a lifting member is slidably connected inside the shell, and the lifting device is used to drive the lifting member to move up and down.

[0013] The present invention further illustrates that the top of the first track member is connected to a collection box, a cooling device for cooling is disposed on the top of the first track member, and a switch for controlling a lifting device and a cooling device is disposed on the top of the first track member.

[0014] The present invention further illustrates that a first moving device is arranged on the top of the first track plate, an output end of the first moving device is connected to a moving member, and a top of the moving member is connected to a mounting plate.

[0015] The present invention further illustrates that a track groove is provided on the top of the base, a first motor is connected to one side of the track groove, an output shaft of the first motor is connected to one end of a screw, the other end of the screw is installed in the track groove through a bearing, an outer surface of the screw is threadedly connected to a threaded seat, a second motor is connected to the top of the threaded seat, the output shaft of the second motor is connected to a turntable, and the top of the turntable is connected to a fourth track plate.

[0016] The present invention further describes that the clamping mechanism includes clamps, and the number of the clamps is two groups, one group of the clamps is connected to the top of the fourth track plate, and the other group of the clamps moves above the fourth track plate through a fourth moving device.

[0017] The present invention further describes that a groove is provided on one side of the clamp, one side of the groove is connected to one end of multiple groups of springs, and a movable groove is provided on the other side of the groove. A square piece is slidably connected in the movable groove, one side of the square piece is rotatably connected to one end of a threaded column, the other end of the threaded column is connected to a handle, and the outer surface of the threaded column is threadedly connected to the clamp.

[0018] The present invention further illustrates that the leveling mechanism includes a mounting frame, two groups of mounting frames are connected to the top of the base, a second track plate is connected between the two groups of mounting frames, a second moving device is provided on one side of the second track plate, an output end of the second moving device is connected to a third track plate, a third moving device is provided on one side of the third track plate, an output end of the third moving device is connected to a second electric telescopic rod, and one end of the second electric telescopic rod is connected to a pressure plate.

[0019] The present invention further illustrates that the top of the base is connected to a bracket, one side of the bracket is connected to a first electric telescopic rod, one end of the first electric telescopic rod is connected to a mounting piece, and one end of the mounting piece is connected to a polishing device.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By setting up a clamping mechanism, it is possible to form an imitation shape through multiple sets of plug-ins to clamp turbine blades of different shapes, thereby forming a large force-bearing area, stably clamping the turbine blades, and there is no need to use a special mold to fix the turbine blades, thereby solving the problem that the force-bearing area is small, which easily causes the turbine blades to shake during the polishing process, or the turbine blades need to be fixed by a special mold during polishing, resulting in reduced working efficiency of the polishing device.

[0022] 2. By setting up a pressing mechanism, when the clamping mechanism clamps the turbine blade, the pressure plate can be controlled to descend, pressing down the two diagonal corners of the turbine blade cross plate, so that the cross plate of the turbine blade and the top surface of the plug-in remain parallel, so that the turbine blade is in a horizontal state, thereby improving the accuracy of the polishing process.

[0023] 3. By setting a limit conveying mechanism, the hot turbine blades that fall from the fixture after polishing can be caught. Due to the structural design of the fallen turbine blades, the fixing parts of the turbine blades first contact the chamfer of the chamfer of the first limit part and slide down along the chamfer. The upper part of the turbine blade is limited by the second limit part, so that the upper part of the turbine blade is inclined to the side of the first limit part. The switch can be controlled to control the lifting part to rise, and the cooling device can be turned on at the same time, so that the turbine blades follow the conveyor belt through the cooling device and move to one end of the conveyor belt after being cooled. The turbine blades that are no longer hot can be inspected immediately. The switch can also be controlled to control the lifting part to descend, and the cooling device can be turned off at the same time, so that the turbine blades fall from the disconnection point into the collection box, so that the turbine blades moved to the inspection position are all cooled. Since the inspection speed is slow compared to the polishing process, the moving position of the turbine blades can be controlled one by one according to the control of the inspector, and the turbine blades that do not need to be inspected immediately do not need to be cooled and fall into the collection box. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a pressing plate in an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the spring in the embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the collection box in an embodiment of the present invention;

[0029] Figure 5 It is a structural schematic diagram of a housing in an embodiment of the present invention;

[0030] Figure 6 Schematic diagram of the structure of a turbine blade in an embodiment of the present invention;

[0031] 1. Base; 2. Bracket; 3. Polishing device; 4. First electric telescopic rod; 5. Mounting part; 6. Track groove; 7. First track plate; 8. Screw rod; 9. Mounting frame; 10. Pressing plate; 11. Second electric telescopic rod; 12. Second track plate; 13. Third track plate; 14. Clamp; 15. Fourth track plate; 16. First motor; 17. Threaded seat; 18. Second motor; 19. Turntable; 20. Threaded column; 21. Handle; 22. Square part; 23. Spring; 24. Plug-in; 25. Moving part; 26. Collecting box; 27. Mounting plate; 28. First limiting part; 29. ​​Second limiting part; 30. Lifting part; 31. Shell; 32. Cooling device; 33. Conveyor belt; 34. Switch; 35. Chamfer; 36. Turbine blade; 37. Horizontal plate; 38. Fixing part; 39. Vertical plate. DETAILED DESCRIPTION

[0032] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides a surface processing device for gas turbine blades, such as Figure 1 FIG. 1 is a schematic diagram showing a structure of an embodiment of a surface processing device for a gas turbine blade. Figure 1 and Figure 3As shown, it includes a base 1, one side of the base 1 is connected to a first track plate 7;

[0034] A clamping mechanism for clamping turbine blades 36 is provided above the base 1;

[0035] A leveling mechanism for placing the turbine blades 36 in a horizontal state is provided above the base 1;

[0036] A position limiting conveying mechanism for conveying turbine blades 36 is provided above the first track plate 7;

[0037] The clamping mechanism includes multiple groups of plug-ins 24, and one end of each group of plug-ins 24 is connected to a spring 23;

[0038] like Figure 6 As shown, the turbine blade 36 includes a flat top and bottom transverse plate 37 , and the turbine blade 36 also includes a special-shaped fixing member 38 for mounting the turbine blade 36 .

[0039] The present invention provides a clamping mechanism, which can form a mimicking shape according to the shape of the fixing member 38 through multiple groups of plug-ins 24, clamp turbine blades 36 of different shapes, form a large force-bearing area, stably clamp the turbine blades 36, and do not need to use a special mold to fix the turbine blades 36, thereby solving the problem that the force-bearing area is small, which easily causes the turbine blades 36 to shake during the polishing process, or the turbine blades 36 need to be fixed by a special mold during polishing, resulting in reduced working efficiency of the polishing device 3.

[0040] In certain embodiments, such as Figure 5 As shown, the position-limiting conveying mechanism includes a mounting plate 27, a conveyor belt 33 is installed on the top of the mounting plate 27, the top of the mounting plate 27 is connected to a vertical plate 39 and a first position-limiting member 28 on both sides, the vertical plate 39 is connected to a second position-limiting member 29 on one side, the second position-limiting member 29 is located above the conveyor belt 33, and a chamfer 35 is provided on the top of the first position-limiting member 29, and a side with a low height of the chamfer 35 is in the same plane as the upper surface of the conveyor belt 33. Due to the structural design of the turbine blade 36 of the present invention, after the turbine blade 36 is released by the clamping mechanism, the turbine blade 36 falls vertically, the fixing member 38 first contacts the chamfer 35 of the first position-limiting member 28, slides along the chamfer 35 to the top of the conveyor belt 33, and the upper half of the turbine blade 36 is limited by the second position-limiting member 29, so that the upper half of the turbine blade 36 is inclined to the side of the first position-limiting member 28.

[0041] In certain embodiments, such as Figure 5As shown, the middle section of the first stopper 28 is provided with a disconnection, the bottom of the disconnection is connected to a shell 31, the shell 31 is a shell 31 that is hollow inside and open at the top, a lifting device is provided inside the shell 31, a lifting member 30 is slidably connected inside the shell 31, and the lifting device is used to drive the lifting member 30 to move up and down. The present invention controls whether the turbine blades 36 need to fall into the collection box 26 by providing the lifting member 30, and the lifting device is a prior art and will not be described in detail here.

[0042] In certain embodiments, such as Figure 4 As shown, the top of the first track member is connected to the collection box 26, the top of the first track member is provided with a cooling device 32 for cooling, and the top of the first track member is provided with a switch 34 for controlling the lifting device and the cooling device 32. The present invention simultaneously controls the lifting of the lifting member 30 and the opening of the cooling device 32, or the lowering of the lifting member 30 and the closing of the cooling device 32 by setting the switch 34. The cooling device 32 is a prior art and will not be described in detail herein.

[0043] In certain embodiments, such as Figure 4 As shown, a first moving device is provided on the top of the first track plate 7, the output end of the first moving device is connected to the moving member 25, and the top of the moving member 25 is connected to the mounting plate 27. The present invention drives the limiting conveying mechanism to move between the two sets of clamps 14 by controlling the first moving device. The first moving device is a prior art and will not be described in detail here.

[0044] In certain embodiments, such as Figure 2 As shown, a track groove 6 is provided on the top of the base 1, and a first motor 16 is connected to one side of the track groove 6. The output shaft of the first motor 16 is connected to one end of a screw rod 8, and the other end of the screw rod 8 is installed in the track groove 6 through a bearing. The outer surface of the screw rod 8 is threadedly connected to a threaded seat 17, and the top of the threaded seat 17 is connected to a second motor 18. The output shaft of the second motor 18 is connected to a turntable 19, and the top of the turntable 19 is connected to a fourth track plate 15. The present invention controls the first motor 16 to drive the screw rod 8 to rotate, drives the threaded seat 17 to move, and makes the turbine blade 36 clamped by the clamping mechanism approach the polishing device 3 for polishing, and controls the second motor 18 to drive the turntable 19 to rotate, and drives the turbine blade 36 to rotate, so that both sides of the turbine blade 36 can be polished.

[0045] In certain embodiments, such as Figure 2As shown, the clamping mechanism includes clamps 14, and the number of the clamps 14 is two groups, one group of the clamps 14 is connected to the top of the fourth track plate 15, and the other group of the clamps 14 moves above the fourth track plate 15 through a fourth moving device. The present invention adjusts the distance between the two groups of clamps 14 by setting a fourth moving device to clamp the turbine blade 36. The fourth moving device is a prior art and will not be described in detail here.

[0046] In certain embodiments, such as Figure 3 As shown, a groove is provided on one side of the clamp 14, one side of the groove is connected to one end of multiple groups of springs 23, and a movable groove is provided on the other side of the groove, and a square piece 22 is slidably connected in the movable groove, one side of the square piece 22 is rotatably connected to one end of a threaded column 20, and the other end of the threaded column 20 is connected to a handle 21, and the outer surface of the threaded column 20 is threadedly connected to the clamp 14. The present invention forms a mimetic shape according to the shape of the fixing member 38 by setting multiple groups of plug-ins 24, and then rotating the handle 21 to drive the threaded column 20 to rotate, drive the square piece 22 to move, make it close to the plug-in 24, fix the plug-in 24, thereby clamping turbine blades 36 of different shapes, forming a large force-bearing area, and stably clamping the turbine blades 36.

[0047] In certain embodiments, such as Figure 2 As shown, the leveling mechanism includes a mounting frame 9, two groups of mounting frames 9 are connected to the top of the base 1, a second track plate 12 is connected between the two groups of mounting frames 9, a second moving device is arranged on one side of the second track plate 12, the output end of the second moving device is connected to the third track plate 13, a third moving device is arranged on one side of the third track plate 13, the output end of the third moving device is connected to the second electric telescopic rod 11, and one end of the second electric telescopic rod 11 is connected to the pressing plate 10. The present invention controls the second moving device and the third moving device to move the pressing plate 10 to the two diagonals at the top of the transverse plate 37 of the turbine blade 36, and then controls the second electric telescopic rod 11 to drive the pressing plate 10 to move downward, so that the transverse plate 37 of the turbine blade 36 and the top surface of the plug-in 24 remain parallel, so that the turbine blade 36 is in a horizontal state, and the accuracy of the polishing process is improved. The second moving device and the third moving device are prior art and will not be described in detail here.

[0048] In certain embodiments, such as Figure 1 As shown, the top of the base 1 is connected to the bracket 2, one side of the bracket 2 is connected to the first electric telescopic rod 4, one end of the first electric telescopic rod 4 is connected to the mounting member 5, and one end of the mounting member 5 is connected to the polishing device 3. The present invention controls the first electric telescopic rod 4 to drive the polishing device 3 to move up and down, and the outer surface of the turbine blade 36 is polished in all directions. The polishing device 3 is a prior art and will not be described in detail here.

[0049] Working principle: When the present invention is used, the turbine blade 36 is placed between the two sets of clamps 14, and the fourth moving device is controlled to drive the clamp 14 to move. The multiple sets of plug-ins 24 are formed into an imitation shape according to the shape of the fixing member 38. While clamping, the second moving device and the third moving device are controlled to move the pressing plate 10 to the two diagonals at the top of the horizontal plate 37 of the turbine blade 36, and then the second electric telescopic rod 11 is controlled to drive the pressing plate 10 to move downward, so that the horizontal plate 37 of the turbine blade 36 and the top surface of the plug-in 24 remain parallel, so that the turbine blade 36 is in a horizontal state, and then the handle 21 is turned to drive the pressing plate 10 to move downward. The movable threaded column 20 rotates, driving the square member 22 to move, so that it is close to the plug-in 24, fixing the plug-in 24, thereby clamping the turbine blade 36, controlling the first motor 16 to drive the screw rod 8 to rotate, driving the threaded seat 17 to move, so that the turbine blade 36 clamped by the clamping mechanism is close to the polishing device 3 for polishing, controlling the first electric telescopic rod 4 to drive the polishing device 3 to move up and down, and polishing the outer surface of the turbine blade 36 in all directions, controlling the second motor 18 to drive the turntable 19 to rotate, driving the turbine blade 36 to rotate, and polishing the two sides of the turbine blade 36, and controlling the first The moving device drives the limiting conveying mechanism to move between the two sets of clamps 14. Due to the structural design of the turbine blade 36 that falls from the clamp 14, the fixing member 38 of the turbine blade 36 first contacts the chamfer 35 of the chamfer 35 of the first limiting member 28, and slides down along the chamfer 35. The upper half of the turbine blade 36 is limited by the second limiting member 29, so that the upper half of the turbine blade 36 is inclined to the side of the first limiting member 28. The lifting member 30 can be controlled to rise by controlling the control switch 34, and the cooling device 32 is turned on at the same time, so that the turbine blade 36 follows the conveyor belt 33 through the cooling device 32. After the temperature device 32 is cooled, it moves to one end of the conveyor belt 33, and the turbine blades 36 that are no longer hot can be inspected immediately. The switch 34 can also be controlled to control the lifting member 30 to descend, and the temperature device 32 can be closed at the same time to make the turbine blades 36 fall from the disconnection point into the collection box 26, so that the turbine blades 36 moved to the inspection position are all cooled. Since the inspection speed is slow compared to the polishing process, the moving position of the turbine blades 36 can be controlled one by one according to the control of the inspector, and the turbine blades 36 that do not need to be inspected immediately do not need to be cooled and dropped into the collection box 26.

[0050] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0051] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A surface processing device for gas turbine blades, It is characterized in that It comprises a base (1), one side of the base (1) being connected to a first track plate (7); A clamping mechanism for clamping turbine blades (36) is provided above the base (1); A leveling mechanism for placing the turbine blades (36) in a horizontal state is provided above the base (1); A position limiting conveying mechanism for conveying turbine blades (36) is arranged above the first track plate (7); The clamping mechanism comprises a plurality of groups of plug-ins (24), one end of each of the plurality of groups of plug-ins (24) being connected to a spring (23).

2. A surface processing device for a gas turbine blade according to claim 1, Features: The position-limiting conveying mechanism comprises a mounting plate (27), a conveying belt (33) is mounted on the top of the mounting plate (27), two sides of the top of the mounting plate (27) are respectively connected to a vertical plate (39) and a first position-limiting member (28), one side of the vertical plate (39) is connected to a second position-limiting member (29), the second position-limiting member (29) is located above the conveying belt (33), a chamfer (35) is provided on the top of the first position-limiting member (29), and a side with a lower height of the chamfer (35) is in the same plane as the upper surface of the conveying belt (33).

3. A surface processing device for a gas turbine blade according to claim 2, Features: The first limiting member (28) is provided with a disconnection portion in the middle section, the disconnection portion is connected to a shell (31) at the bottom, the shell (31) is a shell (31) which is hollow inside and open at the top, a lifting device is provided inside the shell (31), a lifting member (30) is slidably connected inside the shell (31), and the lifting device is used to drive the lifting member (30) to move up and down.

4. A surface processing device for a gas turbine blade according to claim 3, Features: The top of the first track member is connected to a collection box (26), a cooling device (32) for cooling is arranged on the top of the first track member, and a switch (34) for controlling the lifting device and the cooling device (32) is arranged on the top of the first track member.

5. A surface processing device for a gas turbine blade according to claim 1, Features: A first moving device is arranged on the top of the first track plate (7), the output end of the first moving device is connected to a moving member (25), and the top of the moving member (25) is connected to a mounting plate (27).

6. A surface processing device for a gas turbine blade according to claim 1, Features: A track groove (6) is provided on the top of the base (1), one side of the track groove (6) is connected to a first motor (16), an output shaft of the first motor (16) is connected to one end of a screw rod (8), the other end of the screw rod (8) is installed in the track groove (6) through a bearing, an outer surface of the screw rod (8) is threadedly connected to a threaded seat (17), the top of the threaded seat (17) is connected to a second motor (18), an output shaft of the second motor (18) is connected to a turntable (19), and the top of the turntable (19) is connected to a fourth track plate (15).

7. A surface processing device for a gas turbine blade according to claim 1, Features: The clamping mechanism comprises clamps (14), wherein the clamps (14) are in two groups, one group of the clamps (14) is connected to the top of the fourth track plate (15), and the other group of the clamps (14) moves above the fourth track plate (15) via a fourth moving device.

8. A surface processing device for a gas turbine blade according to claim 7, Features: A groove is provided on one side of the clamp (14), one side of the groove is connected to one end of a plurality of groups of springs (23), a movable groove is provided on the other side of the groove, a square piece (22) is slidably connected in the movable groove, one side of the square piece (22) is rotatably connected to one end of a threaded column (20), the other end of the threaded column (20) is connected to a handle (21), and the outer surface of the threaded column (20) is threadedly connected to the clamp (14).

9. A surface processing device for a gas turbine blade according to claim 1, Features: The leveling mechanism comprises a mounting frame (9), two groups of mounting frames (9) are connected to the top of the base (1), a second track plate (12) is connected between the two groups of mounting frames (9), a second moving device is arranged on one side of the second track plate (12), an output end of the second moving device is connected to a third track plate (13), a third moving device is arranged on one side of the third track plate (13), an output end of the third moving device is connected to a second electric telescopic rod (11), and one end of the second electric telescopic rod (11) is connected to a pressing plate (10).

10. A surface processing device for a gas turbine blade according to claim 1, Features: The top of the base (1) is connected to a bracket (2), one side of the bracket (2) is connected to a first electric telescopic rod (4), one end of the first electric telescopic rod (4) is connected to a mounting member (5), and one end of the mounting member (5) is connected to a polishing device (3).

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