阅读说明：本技术 精铸件浇口切割装置 (Precision casting pouring gate cutting device ) 是由 闻晓峰 于 2021-08-15 设计创作，主要内容包括：本发明涉及铸件加工装置技术领域,具体是精铸件浇口切割装置,所述台面的上侧一端固定有立板,所述立板的内侧位于中段位置处转动连接有竖向丝杆,且立板的内侧位于竖向丝杆的两侧位置处对称固定有两个竖向导杆,两个所述竖向导杆上滑动连接有升降滑板,所述升降滑板与竖向丝杆之间通过螺纹转动连接,所述立板的顶部安装有升降电机,所述升降电机的驱动端与竖向丝杆的一端相固定,所述升降滑板的一侧位于中段位置处固定有横板。本发明通过主轴电机带动切割打磨切换机构旋转,切割打磨切换机构可以调节切割状态和打磨状态,从而可以对铸件浇口进行切割和打磨处理,使铸件浇口切割位置处保持平整状态,提高了切割效果。(The invention relates to the technical field of casting processing devices, in particular to a precision casting pouring gate cutting device, wherein a vertical plate is fixed at one end of the upper side of a table top, the inner side of the vertical plate is rotatably connected with a vertical screw rod at the middle section position, two vertical guide rods are symmetrically fixed at the positions of the two sides of the vertical screw rod at the inner side of the vertical plate, a lifting sliding plate is slidably connected onto the two vertical guide rods, the lifting sliding plate is rotatably connected with the vertical screw rod through threads, a lifting motor is installed at the top of the vertical plate, a driving end of the lifting motor is fixed with one end of the vertical screw rod, and a transverse plate is fixed at the middle section position at one side of the lifting sliding plate. According to the invention, the cutting and polishing switching mechanism is driven to rotate by the spindle motor, and can adjust the cutting state and the polishing state, so that the casting sprue can be cut and polished, the cutting position of the casting sprue is kept in a flat state, and the cutting effect is improved.)

1. A precision casting pouring gate cutting device comprises a table top (1) and is characterized in that a vertical plate (2) is fixed at one end of the upper side of the table top (1), a vertical screw rod (3) is rotatably connected at the position, located at the middle section, of the inner side of the vertical plate (2), two vertical guide rods (4) are symmetrically fixed at the positions, located at the two sides of the vertical screw rod (3), of the inner side of the vertical plate (2), a lifting sliding plate (6) is slidably connected onto the two vertical guide rods (4), the lifting sliding plate (6) is rotatably connected with the vertical screw rod (3) through threads, a lifting motor (5) is installed at the top of the vertical plate (2), a driving end of the lifting motor (5) is fixed with one end of the vertical screw rod (3), a transverse plate (7) is fixed at the middle section position of one side of the lifting sliding plate (6), and a transverse screw rod (8) is rotatably connected at the middle section position of the inner side of the transverse plate (7), two transverse guide rods (9) are symmetrically fixed at positions, located on two sides of a transverse screw rod (8), of the inner side of a transverse plate (7), a feeding sliding block (11) is connected on the two transverse guide rods (9) in a sliding mode, the feeding sliding block (11) is rotatably connected with the transverse screw rod (8) through threads, a feeding motor (10) is installed at one end of the transverse plate (7), a driving end of the feeding motor (10) is fixed with one end of the transverse screw rod (8), a spindle motor (12) is installed at one side of the feeding sliding block (11), a quick-release mechanism is arranged at a driving end of the spindle motor (12), the spindle motor (12) is connected with a cutting and polishing switching mechanism through the quick-release mechanism, a fixed table (13) is fixed on the upper side of a table board (1), two expansion plates (14) are symmetrically inserted at two ends of the fixed table (13) in a sliding mode, clamping plates (15) are fixed on the upper sides of one ends of the two expansion plates (14), a clamping driving mechanism is arranged between the two expansion plates (14) and the fixed platform (13);

quick detach mechanism locates coupling sleeve (20) in the spindle motor (12) drive end outside including the cover, offers in the locating hole of spindle motor (12) one side and is fixed in spacing (23) of spindle motor (12) drive end one side, the position department that one side of coupling sleeve (20) corresponds the locating hole is fixed with internal thread sleeve (21), the inboard of internal thread sleeve (21) is connected with clamping screw (22) through the screw thread rotation, the inboard looks adaptation in one end and the locating hole of clamping screw (22), the spacing groove has been seted up to the inboard position department that corresponds spacing (23) of coupling sleeve (20), spacing groove and spacing (23) looks adaptation.

2. The sprue cutting device according to claim 1, wherein the cutting and grinding switching mechanism comprises a cylindrical shell (24) fixed at the bottom end of the connecting sleeve (20), an electromagnetic coil (26) is installed at the inner side of the cylindrical shell (24), an outer housing (25) is sleeved and fixed at the outer side of the lower end of the cylindrical shell (24), four guide rods (27) arranged in a circumferential manner are inserted in the outer housing (25) in a penetrating and sliding manner at the upper end position, grinding sheet mounting plates (29) are fixed at the bottom ends of the four guide rods (27), grinding sheets (32) are installed at the lower sides of the grinding sheet mounting plates (29), four springs (28) respectively sleeved at the outer sides of the four guide rods (27) are connected to the upper sides of the grinding sheet mounting plates (29), and pull rods (30) are fixed at the central position of the upper sides of the grinding sheet mounting plates (29), the upper end of pull rod (30) is fixed with armature (31), four the upper end of guide bar (27) all is fixed with spacing bulge loop (36), the lower extreme of housing (25) is located border position department and is provided with solid fixed ring (33), the outside of solid fixed ring (33) is fixed with cutting piece (34), and gu fixed ring (33) is fixed between solid fixed ring fixing bolt (35) and housing (25) through solid fixed ring.

3. The sprue cutting device according to claim 1, wherein the clamping driving mechanism comprises a clamping motor (16) mounted at one end of the fixed table (13), a clamping screw (44) located at the inner side of the fixed table (13) is fixed at a driving end of the clamping motor (16), a screw slider (17) is rotatably connected to the outer side of the clamping screw (44) through screw threads, two connecting rods (18) are rotatably connected to two sides of the screw slider (17) symmetrically, one ends of the two connecting rods (18) are rotatably connected with one sides of the two expansion plates (14), and one end of the clamping screw (44) is rotatably connected with the inner side of the fixed table (13) through a bearing (19).

4. The sprue cutting device according to claim 1, wherein a dust pump (37) is arranged at one end of the upper side of the table top (1), a dust bag (38) is connected to an air outlet end of the dust pump (37), an air suction pipe (39) is connected to an air inlet end of the dust pump (37), and two dust collection covers (40) are inserted at positions on one side of the air suction pipe (39) corresponding to the fixing table (13).

5. The sprue cutting device according to claim 1, wherein the outer sides of the two vertical guide rods (4) are sleeved with buffer sleeves (42) at the lower end positions, and the two buffer sleeves (42) are made of rubber.

6. The sprue cutting apparatus according to claim 1 wherein a protective pad (43) is provided on one side of each of said clamping plates (15), both of said protective pads (43) having a thickness of 5 mm.

7. The sprue cutting apparatus according to claim 1, wherein four legs (41) are fixed to the bottom end of the table (1) at four corners, and a support bottom plate is fixed to the bottom ends of the four legs (41).

Technical Field

The invention relates to the technical field of casting processing devices, in particular to a precision casting sprue cutting device.

Background

After the precision casting is demoulded, a small bump is arranged on the surface of the precision casting at the position of a pouring gate of the mould, the bump is a pouring gate, the pouring gate is the tail end of a flow channel in the mould and is closest to the narrow part of a mould cavity, and molten metal enters the mould cavity through the small hole. In the latter process, this small projection needs to be subjected to a cutting process, in which a gate cutting device is used.

However, the existing cutting device for cutting the sprue of the precision casting cannot polish the surface of the cutting position, so that burrs exist on the surface of the casting, and the flatness of the surface of the casting is influenced, thereby reducing the quality of the casting, and the existing sprue cutting device cannot fix the precision casting, so that the casting is easy to slide when being cut, the normal cutting treatment is influenced, meanwhile, dust generated by cutting cannot be collected, and the dust drifts in the air to pollute the environment.

Accordingly, a person skilled in the art provides a precision casting gate cutting apparatus to solve the problems set forth in the background art described above.

Disclosure of Invention

The present invention is directed to a sprue cutting apparatus for precision castings, which solves the above problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a precision casting pouring gate cutting device comprises a table board, wherein a vertical plate is fixed at one end of the upper side of the table board, a vertical screw rod is rotatably connected to the inner side of the vertical plate at the middle section position, two vertical guide rods are symmetrically fixed at the positions of the two sides of the vertical screw rod at the inner side of the vertical plate, a lifting slide plate is slidably connected to the two vertical guide rods and is rotatably connected with the vertical screw rod through threads, a lifting motor is installed at the top of the vertical plate, a driving end of the lifting motor is fixed with one end of the vertical screw rod, a transverse plate is fixed at the middle section position at one side of the lifting slide plate, a transverse screw rod is rotatably connected to the inner side of the transverse plate at the middle section position, two transverse guide rods are symmetrically fixed at the positions of the two sides of the transverse screw rod at the inner side of the transverse plate, and a feeding slide block is slidably connected to the two transverse guide rods, the feeding sliding block is rotationally connected with a transverse screw rod through threads, a feeding motor is installed at one end of a transverse plate, a driving end of the feeding motor is fixed with one end of the transverse screw rod, a spindle motor is installed at one side of the feeding sliding block, a quick-release mechanism is arranged at the driving end of the spindle motor, the spindle motor is connected with a cutting and polishing switching mechanism through the quick-release mechanism, a fixed table is fixed at the upper side of the table board, two telescopic plates are symmetrically inserted at two ends of the fixed table in a sliding mode, clamping plates are fixed at the upper sides of one ends of the two telescopic plates, a clamping driving mechanism is arranged between the two telescopic plates and the fixed table, the quick-release mechanism comprises a connecting sleeve sleeved on the outer side of the driving end of the spindle motor, a positioning hole formed in one side of the spindle motor and a limiting strip fixed on one side of the driving end of the spindle motor, and an internal thread sleeve is fixed at the position, corresponding to the positioning hole, of one side of the connecting sleeve, the inner side of the internal thread sleeve is rotatably connected with a fixing screw rod through threads, one end of the fixing screw rod is matched with the inner side of the positioning hole, a limiting groove is formed in the position, corresponding to the limiting strip, of the inner side of the connecting sleeve, and the limiting groove is matched with the limiting strip.

As a still further scheme of the invention: the cutting and polishing switching mechanism comprises a cylindrical shell fixed at the bottom end of the connecting sleeve, an electromagnetic coil is arranged on the inner side of the cylindrical shell, an outer housing is sleeved and fixed on the outer side of the lower end of the cylindrical shell, four guide rods which are arranged in a circumferential manner are inserted in the upper end position of the inner part of the outer housing in a penetrating and sliding manner, polishing sheet mounting plates are fixed at the bottom ends of the four guide rods, polishing sheets are mounted on the lower sides of the polishing sheet mounting plates, and the upper side of the polishing sheet mounting plate is connected with four springs which are respectively sleeved outside the four guide rods, a pull rod is fixed at the central position of the upper side of the polishing sheet mounting plate, an armature is fixed at the upper end of the pull rod, a limiting convex ring is fixed at the upper ends of the four guide rods, the lower extreme of encloser is located border position department and is provided with solid fixed ring, gu fixed ring's the outside is fixed with the cutting piece, and gu fixed ring is fixed between fixed bolt and the encloser through solid fixed ring.

As a still further scheme of the invention: the clamping driving mechanism comprises a clamping motor installed at one end of the fixed table, a driving end of the clamping motor is fixed with a clamping screw rod located on the inner side of the fixed table, the outer side of the clamping screw rod is connected with a screw rod sliding block in a rotating mode through screw teeth, two connecting rods are rotationally connected with two side symmetry of the screw rod sliding block in a rotating mode, one end of each connecting rod is connected with one side of each expansion plate in a rotating mode, and one end of the clamping screw rod is connected with the inner side of the fixed table in a rotating mode through a bearing.

As a still further scheme of the invention: the dust collector is characterized in that a dust pump is arranged at one end of the upper side of the table board, a dust bag is connected to the air outlet end of the dust pump, an air suction pipe is connected to the air inlet end of the dust pump, and two dust collecting covers are inserted at positions, corresponding to the fixing table, of one side of the air suction pipe.

As a still further scheme of the invention: the outer sides of the two vertical guide rods are all sleeved with buffer sleeves at the lower end positions, and the two buffer sleeves are all made of rubber components.

As a still further scheme of the invention: two one side of splint all is provided with the protection pad, two the thickness of protection pad is 5 millimeters.

As a still further scheme of the invention: four supporting legs which are arranged in a rectangular shape are fixed at the positions, located at the four corners, of the bottom end of the table board, and supporting bottom plates are fixed at the bottom ends of the four supporting legs.

Compared with the prior art, the invention has the beneficial effects that:

1. the cutting and polishing switching mechanism is driven to rotate by the spindle motor, and can adjust a cutting state and a polishing state, so that a casting sprue can be cut and polished, the cutting position of the casting sprue is kept in a flat state, and the cutting effect is improved;

2. the cutting and polishing switching mechanism can be quickly separated from and fixed to the driving end of the spindle motor through the quick-release mechanism, so that the cutting and polishing switching mechanism is convenient to maintain;

3. the two telescopic plates are driven to move by the clamping driving mechanism, the two telescopic plates drive the two clamping plates to move, and the two clamping plates can clamp the two sides of the casting so as to fix the casting, improve the stability of the casting and prevent the casting from sliding during cutting and polishing;

4. the dust that produces when will cutting through the dust pump inhales the inboard of breathing pipe, then collects the dust through the dust bag, prevents that the dust from wafting in the air, causes environmental pollution.

Drawings

FIG. 1 is a schematic structural view of a sprue cutting apparatus for a precision casting;

FIG. 2 is a bottom view of the precision casting gate cutting apparatus;

fig. 3 is a partial sectional structural view of the precision casting gate cutting apparatus;

fig. 4 is an enlarged schematic view of a portion a of the precision casting gate cutting apparatus of fig. 2;

fig. 5 is an enlarged schematic view of a portion B of fig. 3 of the precision casting gate cutting apparatus;

fig. 6 is an enlarged schematic view of a portion C of fig. 5 of the precision casting gate cutting apparatus;

fig. 7 is a schematic structural view of a clamp driving mechanism in the precision casting gate cutting apparatus.

In the figure: 1. a table top; 2. a vertical plate; 3. a vertical screw rod; 4. a vertical guide rod; 5. a lifting motor; 6. a lifting slide plate; 7. a transverse plate; 8. a transverse screw rod; 9. a transverse guide rod; 10. a feed motor; 11. a feed slide block; 12. a spindle motor; 13. a fixed table; 14. a retractable plate; 15. a splint; 16. clamping the motor; 17. a screw rod slide block; 18. a connecting rod; 19. a bearing; 20. a connecting sleeve; 21. an internally threaded sleeve; 22. fixing the screw rod; 23. a limiting strip; 24. a cylindrical shell; 25. an outer casing; 26. an electromagnetic coil; 27. a guide bar; 28. a spring; 29. polishing the sheet mounting plate; 30. a pull rod; 31. an armature; 32. grinding the sheets; 33. a fixing ring; 34. cutting the slices; 35. fixing the bolt by a fixing ring; 36. a limit convex ring; 37. a dust pump; 38. a dust collection bag; 39. an air intake duct; 40. a dust collection cover; 41. a support leg; 42. a buffer sleeve; 43. a protection pad; 44. and clamping the screw rod.

Detailed Description

Referring to fig. 1 to 7, in the embodiment of the present invention, a gate cutting device for precision castings includes a table top 1, a vertical plate 2 is fixed at one end of the upper side of the table top 1, a vertical screw rod 3 is rotatably connected to the inner side of the vertical plate 2 at a middle position, two vertical guide rods 4 are symmetrically fixed to the inner side of the vertical plate 2 at two sides of the vertical screw rod 3, a lifting slide plate 6 is slidably connected to the two vertical guide rods 4, the lifting slide plate 6 is rotatably connected to the vertical screw rod 3 through a screw thread, a lifting motor 5 is installed at the top of the vertical plate 2, a driving end of the lifting motor 5 is fixed to one end of the vertical screw rod 3, a transverse plate 7 is fixed to one side of the lifting slide plate 6 at the middle position, a transverse screw rod 8 is rotatably connected to the inner side of the transverse plate 7 at the middle position, and two transverse guide rods 9 are symmetrically fixed to the inner side of the transverse screw rod 8, a feeding slide block 11 is connected on the two transverse guide rods 9 in a sliding manner, the feeding slide block 11 is connected with a transverse screw rod 8 in a rotating manner through threads, a feeding motor 10 is installed at one end of a transverse plate 7, the driving end of the feeding motor 10 is fixed with one end of the transverse screw rod 8, a spindle motor 12 is installed at one side of the feeding slide block 11, a quick-release mechanism is arranged at the driving end of the spindle motor 12, the spindle motor 12 is connected with a cutting and polishing switching mechanism through the quick-release mechanism, a fixed table 13 is fixed at the upper side of the table board 1, two expansion plates 14 are symmetrically inserted at two ends of the fixed table 13 in a sliding manner, a clamping plate 15 is fixed at the upper side of one end of each expansion plate 14, a clamping driving mechanism is arranged between each expansion plate 14 and the fixed table 13, the quick-release mechanism comprises a connecting sleeve 20 sleeved outside the driving end of the spindle motor 12, a positioning hole arranged at one side of the spindle motor 12 and a limiting strip 23 fixed at one side of the driving end of the spindle motor 12, the position department that one side of connecting sleeve 20 corresponds the locating hole is fixed with internal thread sleeve 21, and internal thread sleeve 21's inboard is connected with clamping screw 22 through the screw thread rotation, and clamping screw 22's one end and the inboard looks adaptation of locating hole, the limiting groove has been seted up to the inboard position department that corresponds spacing 23 of connecting sleeve 20, limiting groove and spacing 23 looks adaptation.

In fig. 5: the cutting and polishing switching mechanism comprises a cylindrical shell 24 fixed at the bottom end of the connecting sleeve 20, an electromagnetic coil 26 is installed on the inner side of the cylindrical shell 24, an outer casing 25 is fixedly sleeved on the outer side of the lower end of the cylindrical shell 24, four guide rods 27 which are arranged in a circumferential manner are inserted in the upper end position of the inner part of the outer casing 25 in a penetrating and sliding manner, polishing sheet mounting plates 29 are fixed at the bottom ends of the four guide rods 27, polishing sheets 32 are installed on the lower sides of the polishing sheet mounting plates 29, four springs 28 which are respectively sleeved on the outer sides of the four guide rods 27 are connected to the upper sides of the polishing sheet mounting plates 29, pull rods 30 are fixed at the central positions on the upper sides of the polishing sheet mounting plates 29, armatures 31 are fixed at the upper ends of the pull rods 30, limiting convex rings 36 are fixed at the upper ends of the four guide rods 27, fixing rings 33 are arranged at the edge positions on the lower end of the outer casing 25, and cutting sheets 34 are fixed on the outer sides of the fixing rings 33, and the fixing ring 33 is fixed with the outer housing 25 through the fixing ring fixing bolt 35, and the cutting and polishing switching mechanism can adjust the cutting state and the polishing state, so that the casting sprue can be cut and polished, the cutting position of the casting sprue is kept in a smooth state, and the cutting effect is improved.

In fig. 7: the clamping driving mechanism comprises a clamping motor 16 installed at one end of a fixed table 13, a driving end of the clamping motor 16 is fixed with a clamping screw rod 44 located on the inner side of the fixed table 13, the outer side of the clamping screw rod 44 is rotatably connected with a screw rod sliding block 17 through screw teeth, two connecting rods 18 are rotatably connected with two sides of the screw rod sliding block 17 in a bilateral symmetry mode, one ends of the two connecting rods 18 are respectively rotatably connected with one sides of the two expansion plates 14, one end of the clamping screw rod 44 is rotatably connected with the inner side of the fixed table 13 through a bearing 19, the clamping driving mechanism is used for driving the two expansion plates 14 to move, so that the clamping plate 15 is driven to move, the clamping plate 15 clamps and fixes the two sides of a casting, and the casting is prevented from sliding during cutting.

In fig. 1: the upside one end of mesa 1 is provided with dust pump 37, the end of giving vent to anger of dust pump 37 is connected with dust bag 38, and the inlet end of dust pump 37 is connected with breathing pipe 39, the position department that one side of breathing pipe 39 corresponds fixed station 13 inserts and is equipped with two dust cage 40, dust pump 37 operation is inhaled the inboard to breathing pipe 39 through dust cage 40 with the air that contains the dust near the foundry goods, then the end of giving vent to anger through dust pump 37 is inhaled the inboard to dust bag 38 and is collected, thereby played the effect of dust absorption, prevent that the dust from wafting in the air, cause environmental pollution.

In fig. 1: the outside of two vertical guide arms 4 is located all the cover in lower extreme position department and is equipped with cushion collar 42, and two cushion collars 42 all adopt the component of rubber material, and the cushion collar plays the cushioning effect, prevents that the bottom of lift slide 6 and riser 2 from taking place the striking.

In fig. 3: one side of two splint 15 all is provided with protection pad 43, and the thickness of two protection pads 43 is 5 millimeters, and protection pad 43 plays the effect of protection casting surface.

In fig. 1: the bottom of mesa 1 is located four corners position department and is fixed with four landing legs 41 that are the rectangle and arrange, and the bottom of four landing legs 41 all is fixed with the supporting baseplate, and landing leg 41 is used for the strutting arrangement wholly, improves the stability of placing of device.

The working principle of the invention is as follows: when the device is used, a casting is placed on the upper side of the fixed table 13, then the clamping motor 16 is controlled to rotate, the clamping motor 16 drives the clamping screw rod 44 to rotate, the clamping screw rod 44 rotates to drive the screw rod sliding block 17 to move through screw tooth meshing, the screw rod sliding block 17 moves to drive the two connecting rods 18 to rotate in opposite directions, the two connecting rods 18 respectively drive the two expansion plates 14 to move in an expansion mode, the two expansion plates 14 respectively drive the two clamping plates 15 to move, the two clamping plates 15 can clamp the two sides of the casting to fix the casting, the casting is prevented from being deviated during cutting, normal cutting processing is influenced, after the fixing is completed, the device is started, the electromagnetic coil 26 is electrified to generate magnetic force, the armature 31 is upwards attracted, the armature 31 drives the polishing piece mounting plate 29 and the polishing piece 32 to move upwards to the inner side of the outer housing 25 through the pull rod 30, the spring 28 is compressed, and the lifting motor 5 drives the vertical screw rod 3 to rotate, the vertical screw rod 3 rotates to drive the lifting slide plate 6 to lift through the engagement of the screw teeth, so as to drive the transverse plate 7 to lift, further drive the cutting and polishing switching mechanism to lift, so that the cutting piece 34 moves to the position of a pouring gate of a casting, then the spindle motor 12 operates, the spindle motor 12 drives the cutting and polishing switching mechanism to rotate, so as to drive the cutting piece 34 to rotate, meanwhile, the feed motor 10 operates to drive the transverse screw rod 8 to rotate, the transverse screw rod 8 rotates to drive the feed slide block 11 to longitudinally move through the engagement of the screw teeth, the feed slide block 11 drives the spindle motor 12 to longitudinally move, so as to drive the cutting piece 34 to longitudinally move, the rotating cutting piece 34 can cut the pouring gate of the casting, after the cutting is completed, the electromagnetic coil 26 is controlled to be powered off, the electromagnetic coil 26 loses magnetic force, the polishing piece mounting plate 29 and the polishing piece 32 move downwards under the elastic force of the spring 28, so that the polishing piece 32 moves to the outer side of the outer housing 25, meanwhile, the lower surface of the polishing plate 32 is lower than the lower surface of the cutting plate 34, the spindle motor 12 continues to operate to drive the cutting and polishing switching mechanism to rotate, the rotating polishing plate 32 polishes the position of a cut pouring gate, the flatness of the surface of a casting is improved, the fixing screw 22 of the quick-release mechanism is rotated, the fixing screw 22 can be separated from and combined with a positioning hole on one side of the spindle motor 12 through threaded engagement, thereby separating and fixing the connection sleeve 20 from the spindle motor 12, facilitating disassembly and assembly, a large amount of dust is generated at the time of cutting and grinding, the dust pump 37 is operated to suck air containing dust in the vicinity of the casting to the inside of the suction pipe 39 through the dust collection cover 40, then the dust is sucked to the inner side of the dust bag 38 through the air outlet end of the dust pump 37 for collection, thereby playing a role of dust collection and preventing the dust from floating in the air to cause environmental pollution.

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 are equivalent to or changed within the technical scope of the present invention.