阅读说明：本技术 一种涂料生产用双锥螺旋粉体混合机 (Bipyramid spiral powder mixes machine for paint produce ) 是由 黄志国 单益民 肖大宗 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种涂料生产用双锥螺旋粉体混合机,涉及混合机技术领域,具体为一种涂料生产用双锥螺旋粉体混合机,包括支撑架,所述支撑架内壁的上方固定安装有两个固定卡箍,且两个固定卡箍的中部卡接有混合缸,所述混合缸外部的左侧固定安装有固定架。该涂料生产用双锥螺旋粉体混合机,通过摆动电机带动驱动盘进行转动,从而带动驱动盘顶部的连接杆进行转动,进而带动连接杆顶端卡接的混合缸进行摆动,由于连接杆位于驱动盘圆心的外侧,从而使连接杆转动方式变位偏心转动,且混合缸上方的两侧卡接于支撑架的内部,进一步带动混合缸下方进行有规律的摆动,使混合缸内部的原料在旋转搅拌的同时进行晃动。(The invention discloses a double-cone spiral powder mixing machine for paint production, which relates to the technical field of mixing machines, and particularly relates to a double-cone spiral powder mixing machine for paint production. This bipyramid spiral powder mixes machine for coating production, it rotates to drive the driving-disc through swing motor, thereby the connecting rod that drives the driving-disc top rotates, and then the mixing tank that drives connecting rod top joint swings, because the connecting rod is located the outside in the driving-disc centre of a circle, thereby make the connecting rod rotation mode shift eccentric rotation, and the both sides joint of mixing tank top is in the inside of support frame, further drive the mixing tank below and carry out regular swing, make the inside raw materials of mixing tank rock when rotatory stirring.)

1. The utility model provides a coating production is with bipyramid spiral powder mixer, includes support frame (1), its characterized in that: the upper portion of the inner wall of the support frame (1) is fixedly provided with two fixed clamps (2), the middle portion of the two fixed clamps (2) is connected with a mixing cylinder (3), the left side of the outer portion of the mixing cylinder (3) is fixedly provided with a fixed frame (4), the middle portion of the fixed frame (4) is fixedly provided with a driving motor (5), an output shaft of the driving motor (5) is fixedly sleeved with a driving gear (6), the right side of the fixed frame (4) is fixedly provided with a fixed plate, the middle portion of the fixed plate is movably sleeved with a hollow driving shaft (7), the outer portion of the hollow driving shaft (7) is fixedly sleeved with a driven gear (8) located below the fixed plate, the outer portion of the hollow driving shaft (7) is sleeved with a transmission case (9) located below the driven gear (8), and two ends of the transmission case (, and the bottom of the conversion box (10) is movably sleeved with a mixing rod (11), the outer part of the mixing rod (11) is fixedly sleeved with a mixing blade (12) positioned in the mixing cylinder (3), the outer part of the hollow driving shaft (7) is fixedly provided with a high-pressure spray head (13) positioned in the mixing cylinder (3), the outer part of the hollow driving shaft (7) is fixedly sleeved with a top plate (14) positioned between the two conversion boxes (10), the middle part of the inner wall of the support frame (1) is fixedly provided with two fixing rods (15), the top ends of the fixing rods (15) are fixedly provided with a fixing block (16), the inner side of the fixing block (16) is fixedly provided with three buffer springs (17), and the other ends of the buffer springs (17) are fixedly connected with the mixing cylinder, the bottom fixed mounting who mixes jar (3) has the discharging pipe, the bottom fixed mounting of support frame (1) has unloading slide (22), and the top joint of unloading slide (22) has the blowing case (21) that are located mixing jar (3) bottom, the back fixed mounting of support frame (1) has motor frame (23), and the one end fixed mounting of motor frame (23) has swing motor (19), fixed cover has connect driving-disc (18) on the output shaft of swing motor (19), and the top activity of driving-disc (18) has cup jointed connecting rod (20), the other end joint of connecting rod (20) is in the outside below of mixing jar (3).

2. The double-cone helical powder mixer for paint production according to claim 1, wherein: the outer edge of the driven gear (8) is meshed with the driving gear (6), the driving gear (6) and the driven gear (8) are located on the same horizontal plane, and the two mixing rods (11) at the bottom of the conversion box (10) are in transmission connection with the hollow driving shaft (7) through the transmission box (9).

3. The double-cone helical powder mixer for paint production according to claim 1, wherein: two switching box (10) mirror image distributes in the both sides of hollow drive shaft (7), the length of left side mixing rod (11) is less than the length of right side mixing rod (11), two the equal fixed mounting in outside of mixing rod (11) has mixing blade (12).

4. The double-cone helical powder mixer for paint production according to claim 1, wherein: the shape of the mixing cylinder (3) is in an inverted conical shape, the two mixing rods (11) are inclined, and the inclined angle of the mixing rods (11) is the same as the inclined angle of the interior of the mixing cylinder (3).

5. The double-cone helical powder mixer for paint production according to claim 1, wherein: roof (14) and the top of mixing jar (3) are in on the same horizontal plane, and the diameter of roof (14) is less than the diameter on mixing jar (3) top, two the top of mixing rod (11) is located between roof (14) and mixing jar (3) inner wall, and the week side fixed mounting of roof (14) has the stereoplasm brush hair.

6. The double-cone helical powder mixer for paint production according to claim 1, wherein: the utility model discloses a mixing cylinder, including mixing jar (3), dead lever (15), fixed block (16) quantity is two, and two dead lever (15) and fixed block (16) mirror image distribution in the both sides of mixing jar (3), the medial surface of fixed block (16) is the arc surface, and two fixed block (16) inboard equal fixed mounting have buffer spring (17).

7. The double-cone helical powder mixer for paint production according to claim 1, wherein: unloading slide (22) openly are the slope form, and the positive bottom of unloading slide (22) and universal wheel bottom of support frame (1) below are in on the same horizontal plane, the spout has been seted up at the top of unloading slide (22), and blowing case (21) bottom fixed mounting have with spout matched with pulley.

8. The double-cone helical powder mixer for paint production according to claim 1, wherein: the connecting rod (20) is movably sleeved on the outer side of the circle center of the driving disc (18), four universal wheels are fixedly mounted at the bottom of the supporting frame (1), and a brake plate is fixedly mounted on the outer side of each universal wheel.

Technical Field

The invention relates to the technical field of mixers, in particular to a double-cone spiral powder mixer for paint production.

Background

The mixer is a machine which uniformly mixes two or more materials by utilizing mechanical force, gravity and the like, and is widely applied to various industries and daily life, and the double-cone spiral mixer is widely applied to mixing powder such as chemical industry, ceramic powder, pesticides, dye, food, feed, building materials, rare earth and the like with powder.

In the production process of the coating, two or more raw materials are usually required to be mixed so as to meet the use requirement, the existing mixing device usually drives a stirring rod and cabinet raw materials to be mixed by a driving device, the mixing method can only simply mix the raw materials, can not fully mix various raw materials and can not meet the mixing requirement, in addition, after the raw materials are mixed, the powdery raw materials can be stuck on the stirring rod and can not fall off only by rotating, so that the raw materials can continuously corrode the stirring rod and the stirring cylinder for a long time, the service life of the stirring device is shortened, and simultaneously, when raw materials are mixed and stirred, the stirring device can vibrate, and the existing partial devices do not have specific devices for absorbing vibration, so that the structure of the stirring device can be loosened in the past, and the probability of safety accidents is increased.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the double-cone spiral powder mixer for paint production, which has the advantages of long service life, convenience in cleaning, uniform mixing and the like, and solves the problems in the background art.

In order to realize the purposes of long service life, convenient cleaning and uniform mixing, the invention is realized by the following technical scheme: a double-cone spiral powder mixer for paint production comprises a support frame, wherein two fixed clamps are fixedly mounted above the inner wall of the support frame, a mixing cylinder is clamped in the middle of the two fixed clamps, a fixing frame is fixedly mounted on the left side of the outer portion of the mixing cylinder, a driving motor is fixedly mounted in the middle of the fixing frame, a driving gear is fixedly sleeved on an output shaft of the driving motor, a fixed plate is fixedly mounted on the right side of the fixing frame, a hollow driving shaft is sleeved on the middle of the fixed plate in a movable mode, a driven gear located below the fixed plate is sleeved on the outer portion of the hollow driving shaft, a transmission case located below the driven gear is sleeved on the outer portion of the hollow driving shaft in a fixed mode, conversion cases are fixedly mounted at two ends of the transmission case, a mixing rod is sleeved on the bottom of the conversion case in a movable mode, and the outer part of the hollow driving shaft is fixedly sleeved with a mixing blade positioned in the mixing cylinder, the outer part of the hollow driving shaft is fixedly provided with a high-pressure spray head positioned in the mixing cylinder, the outer part of the hollow driving shaft is fixedly sleeved with a top plate positioned between two conversion boxes, the middle part of the inner wall of the supporting frame is fixedly provided with two fixed rods, the top ends of the fixed rods are fixedly provided with fixed blocks, the inner sides of the fixed blocks are fixedly provided with three buffer springs, the other ends of the buffer springs are fixedly connected with the mixing cylinder, the bottom end of the mixing cylinder is fixedly provided with a discharge pipe, the bottom of the supporting frame is fixedly provided with a discharging sliding plate, the top of the discharging sliding plate is clamped with a discharging box positioned at the bottom of the mixing cylinder, the back of the supporting frame is fixedly provided with a motor frame, one end of, and the top of driving-disc activity has cup jointed the connecting rod, the other end joint of connecting rod is in the outside below of mixing jar.

Preferably, the outer edge of the driven gear is meshed with the driving gear, the driving gear and the driven gear are located on the same horizontal plane, and the mixing rods at the bottoms of the two conversion boxes are in transmission connection with the hollow driving shaft through transmission boxes.

Preferably, two the conversion case mirror image distributes in the both sides of cavity drive shaft, the length of left side mixing bar is less than the length of right side mixing bar, two the equal fixed mounting in outside of mixing bar has mixing blade.

Preferably, the mixing cylinder is in the shape of an inverted cone, the two mixing rods are inclined, and the inclination angle of the mixing rods is the same as the inclination angle of the inside of the mixing cylinder.

Preferably, the top plate is located same horizontal plane with the top of mixing the jar, and the diameter of top plate is less than the diameter on mixing jar top, two the top of mixing rod is located between top plate and the mixing jar inner wall, and the week side fixed mounting of top plate has the stereoplasm brush hair.

Preferably, the quantity of the fixed rods and the fixed blocks is two, the two fixed rods and the fixed blocks are distributed on two sides of the mixing cylinder in a mirror image mode, the inner side faces of the fixed blocks are arc faces, and buffer springs are fixedly mounted on the inner sides of the two fixed blocks.

Preferably, the front surface of the blanking sliding plate is inclined, the front bottom of the blanking sliding plate and the bottom of the universal wheel below the support frame are positioned on the same horizontal plane, a sliding groove is formed in the top of the blanking sliding plate, and a pulley matched with the sliding groove is fixedly installed at the bottom of the discharging box.

Preferably, the connecting rod is movably sleeved outside the circle center of the driving disc, four universal wheels are fixedly mounted at the bottom of the supporting frame, and a braking plate is fixedly mounted outside the universal wheels.

The invention provides a double-cone spiral powder mixer for paint production, which has the following beneficial effects:

1. the double-cone spiral powder mixer for paint production drives the driving disc to rotate through the swing motor, thereby driving the connecting rod at the top of the driving disc to rotate and further driving the mixing cylinder clamped at the top end of the connecting rod to swing, and the connecting rod is positioned outside the circle center of the driving disc, thereby enabling the rotating mode of the connecting rod to shift and eccentrically rotate, and the two sides above the mixing cylinder are clamped in the support frame, further driving the lower part of the mixing cylinder to regularly swing, so that raw materials in the mixing cylinder shake while rotating and stirring, further improving the mixing effect of the raw materials, in addition, the driving gear is driven to rotate through the driving motor, thereby driving the driving gear to rotate along the meshed driven gear, further driving the hollow driving shaft fixedly sleeved in the middle part of the driven gear to rotate, and driving the transmission box outside the hollow driving shaft to rotate, thereby drive the mixing lever of two conversion bottom of the case portions and rotate, drive the mixing blade of mixing lever outside and stir the raw materials and mix, drive the mixing blade of cavity drive shaft outside simultaneously and mix the raw materials, improve the mixed effect of raw materials, simultaneously, two mixing levers pass through the transmission case and are connected with the transmission of cavity drive shaft, carry out the biography of autobiography when mixing lever carries out the revolution, have further improved the effect of mixing.

2. The double-cone spiral powder mixer for paint production has two converting boxes over the top plate, when the raw materials are mixed, the influence of the powdery raw materials on the two conversion boxes is reduced, the probability of damage of the two conversion boxes is reduced, the service life is prolonged, and simultaneously, compact brush hair is fixedly arranged on the peripheral side of the top plate, so that powdery raw materials in the mixing cylinder are prevented from being dispersed while the two mixing rods can rotate, the influence on the environment is reduced, meanwhile, the upward dispersion of the powdery raw materials on the surface of the conversion box is reduced, the service life of the conversion box is further prolonged, and in addition, buffer springs are fixedly arranged on two sides below the mixing cylinder, when the connecting rod drives the mixing cylinder to swing, the shaking amplitude of the mixing cylinder is ensured to be within a safe range, the probability of safety accidents is reduced, and the service life is further prolonged.

3. This coating production is with bipyramid spiral powder mixer mixes the completion back to the raw materials, put through the high pressure water at cavity drive shaft top, thereby high pressure nozzle blowout high pressure rivers through cavity drive shaft below fixed mounting, thereby wash the outside hybrid blade of cavity drive shaft and two mixing arms, reduce attaching to of powder raw materials, the abluent effect has been improved, in high pressure nozzle blowout high pressure rivers, the cavity drive shaft drives the mixing arm of both sides and rotates, the abluent effect has further been improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the backside of the present invention;

FIG. 3 is a schematic view of the rotary drive of the present invention;

FIG. 4 is a schematic view of the structure of the present invention;

fig. 5 is a schematic structural diagram of the swing of the present invention.

In the figure: 1. a support frame; 2. fixing a clamp; 3. a mixing cylinder; 4. a fixed mount; 5. a drive motor; 6. a drive gear; 7. a hollow drive shaft; 8. a driven gear; 9. a transmission case; 10. a conversion box; 11. a mixing rod; 12. a mixing blade; 13. a high pressure spray head; 14. a top plate; 15. fixing the rod; 16. a fixed block; 17. a buffer spring; 18. a drive disc; 19. a swing motor; 20. a connecting rod; 21. a material placing box; 22. a blanking sliding plate; 23. a motor frame; 24. and feeding the material pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1 to 5, the present invention provides a technical solution: a double-cone spiral powder mixer for paint production comprises a support frame 1, two fixed clamps 2 are fixedly installed above the inner wall of the support frame 1, a mixing cylinder 3 is clamped in the middle of the two fixed clamps 2, a fixed frame 4 is fixedly installed on the left side of the outer portion of the mixing cylinder 3, a driving motor 5 is fixedly installed in the middle of the fixed frame 4, a driving gear 6 is fixedly sleeved on an output shaft of the driving motor 5, a fixed plate is fixedly installed on the right side of the fixed frame 4, a hollow driving shaft 7 is movably sleeved in the middle of the fixed plate, a driven gear 8 located below the fixed plate is fixedly sleeved on the outer portion of the hollow driving shaft 7, a transmission case 9 located below the driven gear 8 is fixedly sleeved on the outer portion of the hollow driving shaft 7, conversion cases 10 are fixedly installed at two ends of the transmission case 9, a mixing rod 11 is movably sleeved at the bottom of the conversion cases 10, and mixing blades 12 located, a mixing blade 12 positioned inside the mixing cylinder 3 is fixedly sleeved outside the hollow driving shaft 7, a high-pressure spray head 13 positioned inside the mixing cylinder 3 is fixedly installed outside the hollow driving shaft 7, a top plate 14 positioned between the two conversion boxes 10 is fixedly sleeved outside the hollow driving shaft 7, two fixing rods 15 are fixedly installed in the middle of the inner wall of the supporting frame 1, a fixing block 16 is fixedly installed at the top ends of the fixing rods 15, three buffer springs 17 are fixedly installed on the inner side of the fixing block 16, the other ends of the buffer springs 17 are fixedly connected with the mixing cylinder 3, a discharge pipe is fixedly installed at the bottom end of the mixing cylinder 3, a discharge sliding plate 22 is fixedly installed at the bottom of the supporting frame 1, a discharge box 21 positioned at the bottom of the mixing cylinder 3 is clamped at the top of the discharge sliding plate 22, a motor frame 23 is fixedly installed at the back of the supporting frame 1, and a, a driving disc 18 is fixedly sleeved on an output shaft of the swing motor 19, a connecting rod 20 is movably sleeved on the top of the driving disc 18, and the other end of the connecting rod 20 is clamped below the outer part of the mixing cylinder 3.

Wherein, driven gear 8 outer along with drive gear 6 intermeshing, and drive gear 6 is in on the same horizontal plane with driven gear 8, the hybrid beam 11 of two transfer case 10 bottoms, be connected with hollow drive shaft 7 transmission through transmission case 9, drive gear 6 through driving motor 5 and rotate, thereby drive gear 6 outer along the driven gear 8 of meshing and rotate, and then drive the fixed cavity drive shaft 7 that cup joints in 8 middle parts of driven gear and rotate, drive the 7 outside transmission case 9 of hollow drive shaft and rotate, thereby drive the hybrid beam 11 of two transfer case 10 bottoms and rotate, it mixes to stir the raw materials to drive the hybrid blade 12 of hybrid beam 11 outside, it mixes to the raw materials to drive the 7 outside hybrid blade 12 of hollow drive shaft simultaneously, improve the mixed effect of raw materials.

Wherein, two change-over boxes 10 are distributed on both sides of the hollow driving shaft 7 in a mirror image manner, the length of the left mixing rod 11 is smaller than that of the right mixing rod 11, mixing blades 12 are fixedly arranged on the outer portions of the two mixing rods 11, the two mixing rods 11 are in transmission connection with the hollow driving shaft 7 through a transmission box 9, autobiography is carried out while the mixing rods 11 revolve, the mixing effect is further improved, after the raw materials are mixed, high-pressure water is communicated on the top of the hollow driving shaft 7, so that high-pressure water flow is sprayed out through a high-pressure spray nozzle 13 fixedly arranged below the hollow driving shaft 7, the mixing blades 12 on the outer portions of the hollow driving shaft 7 and the two mixing rods 11 are cleaned, the adhesion of the powder raw materials is reduced, the cleaning effect is improved, and the hollow driving shaft 7 drives the mixing rods 11 on both sides to rotate while the high-pressure, further improving the cleaning effect.

Wherein, the shape of mixing jar 3 is the coniform of inversion, two mixing rod 11 are the slope form, and the angle of mixing rod 11 slope is the same with the inside inclination of mixing jar 3, the mixing jar 3 of slope form has reduced the degree of difficulty of unloading, make the raw materials more concentrated simultaneously, the effect of mixing has been improved, two mixing rod 11 are the same with the angle of mixing jar 3 slope, when guaranteeing that mixing rod 11 can rotate and mix the raw materials, the probability that two mixing rod 11 and 3 inner walls of mixing jar bump has been reduced, the device's life is further improved.

Wherein the top plate 14 and the top of the mixing cylinder 3 are positioned on the same horizontal plane, the diameter of the top plate 14 is smaller than that of the top end of the mixing cylinder 3, the top ends of the two mixing rods 11 are positioned between the top plate 14 and the inner wall of the mixing cylinder 3, and the peripheral side of the top plate 14 is fixedly provided with hard bristles, because the two conversion boxes 10 are positioned above the top plate 14, when the raw materials are mixed, the influence of the powdery raw materials on the two conversion boxes 10 is reduced, the probability of damage to the two conversion boxes 10 is reduced, the service life is prolonged, and simultaneously, compact bristles are fixedly arranged on the peripheral side of the top plate 14, so that the two mixing rods 11 can rotate, powdery raw materials in the mixing cylinder 3 are prevented from being dispersed, the influence on the environment is reduced, meanwhile, the powdery raw materials are prevented from being dispersed upwards and attached to the surface of the conversion box 10, and the service life of the conversion box 10 is further prolonged.

Wherein, dead lever 15, fixed block 16 quantity is two, and two dead levers 15 and 16 mirror image distributions of fixed block in the both sides of mixing jar 3, the medial surface of fixed block 16 is the arc surface, and two 16 inboard equal fixed mounting of fixed block have buffer spring 17, there is buffer spring 17 at the both sides fixed mounting of mixing jar 3 below, when connecting rod 20 drives mixing jar 3 and carries out the wobbling, guarantee that mixing jar 3 rock amplitude is within safety range, the probability of taking place the incident has been reduced, further life has been improved.

Wherein, unloading slide 22 openly is the slope form, and the universal wheel bottom of the positive bottom of unloading slide 22 and support frame 1 below is in on the same horizontal plane, the spout has been seted up at unloading slide 22's top, and blowing case 21 bottom fixed mounting have with spout matched with pulley, the blowing case 21 of 3 bottoms of hybrid cylinder makes the raw materials after mixing derive smoothly, and the spout has been seted up at unloading slide 22 top, and there is the pulley bottom blowing case 21 fixed mounting, prescribe a limit to the blowing case 21 position, guarantee that blowing case 21 can only carry out the back-and-forth movement along the spout, and unloading slide 22 front end is the inclined plane, the degree of difficulty of blowing 21 unloading has been reduced.

Wherein, the connecting rod 20 is movably sleeved outside the circle center of the driving disc 18, four universal wheels are fixedly arranged at the bottom of the supporting frame 1, and the outer side of the universal wheel is fixedly provided with a brake plate, the driving disc 18 is driven to rotate by the swinging motor 19, thereby driving the connecting rod 20 at the top of the driving disk 18 to rotate, further driving the mixing cylinder 3 clamped at the top end of the connecting rod 20 to swing, because the connecting rod 20 is positioned at the outer side of the circle center of the driving disk 18, the rotating mode of the connecting rod 20 is shifted and eccentrically rotated, and the two sides above the mixing cylinder 3 are clamped in the supporting frame 1, further driving the lower part of the mixing cylinder 3 to regularly swing, so that the raw materials in the mixing cylinder 3 can swing while rotating and stirring, further improving the mixing effect of the raw materials, the universal wheels are additionally arranged at the bottom of the support frame 1, so that the moving difficulty of the device is reduced, and the working efficiency is further improved.

In conclusion, when the double-cone spiral powder mixer for paint production is used, raw materials to be mixed are guided into the mixing cylinder 3 through the feeding pipe 24, the driving gear 6 is driven to rotate through the driving motor 5, so that the driving gear 6 is driven to rotate along the meshed driven gear 8, the hollow driving shaft 7 fixedly sleeved in the middle of the driven gear 8 is driven to rotate, the transmission boxes 9 outside the hollow driving shaft 7 are driven to rotate, the mixing rods 11 at the bottoms of the two conversion boxes 10 are driven to rotate, the mixing blades 12 outside the mixing rods 11 are driven to stir and mix the raw materials, the mixing blades 12 outside the hollow driving shaft 7 are driven to mix the raw materials, the two mixing rods 11 are in transmission connection with the hollow driving shaft 7 through the transmission boxes 9, the mixing rods 11 revolve and simultaneously conduct self-transmission, and the mixing effect is further improved, the driving disc 18 is driven to rotate by the swing motor 19, so that the connecting rod 20 at the top of the driving disc 18 is driven to rotate, the mixing cylinder 3 clamped at the top end of the connecting rod 20 is driven to swing, the connecting rod 20 is positioned outside the circle center of the driving disc 18, the rotating mode of the connecting rod 20 is shifted and eccentrically rotated, two sides above the mixing cylinder 3 are clamped in the support frame 1, the lower part of the mixing cylinder 3 is further driven to regularly swing, raw materials in the mixing cylinder 3 are shaken while being rotationally stirred, high-pressure water is communicated with the top of the hollow driving shaft 7 after the raw materials are mixed, the high-pressure water is sprayed out by the high-pressure spray head 13 to clean the hollow driving shaft 7 and the mixing blades 12 outside the two mixing rods 11 while the hollow driving shaft 7 and the two mixing rods 11 rotate, the cleaning effect of the device is improved, and the materials are recovered by the blanking slide plate 22 clamped at the top, and (4) finishing.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.