阅读说明：本技术 一种捻线机 (Twisting machine ) 是由 刘永飞 于 2019-09-25 设计创作，主要内容包括：本发明涉及纺织设备的技术领域,尤其是涉及一种捻线机。一种捻线机,包括机架、位于机架上的出线装置和引线装置、收线装置,所述出线装置包括出线电机、被出线电机驱动着转动的出线主轴、至少两根出线辊以及带动出线辊随出线主轴一起转动的传动组件,引线装置包括细纱缓存机构,细纱缓存机构包括缓存槽、检测缓存槽内细纱是否用尽的检测组件,当检测组件检测到缓存槽内无细纱时,出线电机驱动出线辊放线并延时关闭。细纱预储在缓存槽内,在收线装置收卷绕线时,缓存槽内的细纱被带动着收卷。由于细纱一直是以低张紧力状态收卷捻合成纱线的,因此在捻合多种不同纱线时可以避免伸缩度不同导致低质量纱线的问题。(The invention relates to the technical field of textile equipment, in particular to a twisting machine. A twisting machine comprises a machine frame, a wire outlet device, a wire leading device and a wire collecting device, wherein the wire outlet device is positioned on the machine frame and comprises a wire outlet motor, a wire outlet main shaft driven by the wire outlet motor to rotate, at least two wire outlet rollers and a transmission assembly driving the wire outlet rollers to rotate along with the wire outlet main shaft, the wire leading device comprises a spun yarn caching mechanism, the spun yarn caching mechanism comprises a caching groove and a detection assembly detecting whether spun yarns in the caching groove are used up or not, and when the detection assembly detects that no spun yarns exist in the caching groove, the wire outlet motor drives the wire outlet rollers to pay off and close in a delayed mode. The spun yarns are pre-stored in the buffer groove, and when the winding device winds the yarns in a winding mode, the spun yarns in the buffer groove are driven to wind the yarns. Since the spun yarn is always twisted in a state of low tension, the problem of low quality yarn due to different degrees of stretch can be avoided when twisting a plurality of different yarns.)

1. The utility model provides a twisting frame, includes frame (1), be located play wire device (2) and lead wire device (3), take-up (4) on frame (1), characterized by: the yarn outgoing device (2) comprises a yarn outgoing motor (5), a yarn outgoing main shaft (6) driven by the yarn outgoing motor (5) to rotate, at least two yarn outgoing rollers (7) and a transmission assembly (8) driving the yarn outgoing rollers (7) to rotate along with the yarn outgoing main shaft (6), the yarn outgoing device (3) comprises a spun yarn caching mechanism (17), the spun yarn caching mechanism (17) comprises a caching groove (20) and a detection assembly (21) for detecting whether spun yarns in the caching groove (20) are used up or not, and when the detection assembly (21) detects that no spun yarns exist in the caching groove (20), the yarn outgoing motor (5) drives the yarn outgoing rollers (7) to pay off and is closed in a delayed mode.

2. Twisting machine according to claim 1, wherein: be equipped with first mounting panel (9) on frame (1), be qualified for the next round of competitions motor (5) and first mounting panel (9) fixed connection, with motor (5) play a fixed connection be qualified for the next round of competitions main shaft (6) and wear out first mounting panel (9), be qualified for the next round of competitions the first driving gear (10) of one end fixedly connected with that first mounting panel (9) were worn out in main shaft (6), be qualified for the next round of competitions roller (7) and rotate with first mounting panel (9) and be connected, and all set firmly on every roller (7) of outgoing line a driven gear (11) with first driving gear (10) engaged with.

3. Twisting machine according to claim 2, wherein: every the circumference side equipartition shaping of going out line roller (7) has three extrusion groove (12), all is equipped with extrusion block (13) in every extrusion groove (12), connects through spring (14) between extrusion block (13) and extrusion groove (12) bottom.

4. Twisting machine according to claim 3, wherein: the outer surface of the extrusion block (13) is an arc-shaped surface matched and tightly abutted with the inner wall of the bobbin, and the side surface of the extrusion block (13) far away from the first mounting plate (9) inclines towards one side of the first mounting plate (9) in the direction far away from the spring (14).

5. Twisting machine according to claim 2, wherein: the position that lies in every outlet roller (7) below on first mounting panel (9) all is equipped with wire piece (15) with first mounting panel (9) fixed connection, and wire piece (15) are half-circular arc and wire piece (15) and down slope to the direction of keeping away from first mounting panel (9).

6. Twisting machine according to claim 5, wherein: an avoiding groove (16) is formed in the position, corresponding to the meshing position of the first driving gear (10) and the first driven gear (11), on the wire sheet (15).

7. Twisting machine according to claim 1, wherein: detection component (21) including erect Contraband type frame (22) in buffer memory groove (20) top, install metal rod (23) on Contraband type frame (22) and be located Contraband type frame (22) and conductive contact (24) that switch on when being connected with metal rod (23) electricity, the one end of metal rod (23) is passed through metal shrapnel (25) and is welded with Contraband type frame (22), the other end tilt up of metal rod (23) and welding have limiting plate (26) on the terminal surface, the welding has conductive plate (27) that extend to conductive contact (24) below on limiting plate (26), be connected with extension spring (28) between the one end that metal rod (23) are close to limiting plate (26) and the horizontal pole of Contraband type frame (22).

8. Twisting machine according to claim 1, wherein: the wire leading device (3) further comprises a wire bundling mechanism (18), the wire bundling mechanism (18) comprises a wire bundling plate (29), and a wire bundling hole (30) with the diameter gradually reduced from the side facing the buffer storage groove (20) to the side far away from the buffer storage groove (20) is formed in the middle of the wire bundling plate (29).

9. Twisting machine according to claim 8, wherein: the wire leading device (3) further comprises a tensioning mechanism (19), the tensioning mechanism (19) comprises a tensioning column (31) located on one side, back to the cache groove (20), of the wire bundling plate (29), and a cylindrical tensioning rod (32) is welded on the side face of the upper end of the tensioning column (31).

10. Twisting machine according to claim 1, wherein: the take-up device (4) comprises a take-up motor (33), a take-up roller (34) connected with the take-up motor (33) and a reciprocating mechanism (35) for uniformly winding yarns on the take-up roller (34); the wire take-up roller (34) comprises a solid shaft (37) fixedly connected with an output shaft of the wire take-up motor (33) and an inflatable shaft (38) fixedly connected with the solid shaft (37); the reciprocating mechanism (35) comprises a second driving gear (39) fixed on the solid shaft (37), a guide rod (40) located on the side face of the wire winding roller (34), a reciprocating screw rod (41) parallel to the guide rod (40), a second driven gear (42) fixed on the reciprocating screw rod (41) and meshed with the second driving gear (39), and a wire guide ring (43) in sliding connection on the guide rod (40) and in threaded fit with the reciprocating screw rod (41), wherein a wire guide hole (44) is formed in the side face of the wire guide ring (43).

Technical Field

The invention relates to the technical field of textile equipment, in particular to a twisting machine.

Background

The twisting machine is a textile machinery device which twists a plurality of strands of spun yarns into one strand, processes the yarns into yarns after the yarns are doubled, and then screens and weaves the yarns into textiles.

A twisting machine of a breakage preventing structure is disclosed in utility model patent No. CN 209066059U. The twisting machine replaces a transmission shaft by a roller motor, and the transmission shaft drives a yarn roller to twist yarns, so that yarn breakage during yarn twisting is avoided.

However, the above technical solutions have the following disadvantages: when a twisting machine is used to twist two or more kinds of spun yarns having different strengths and tensile properties, such as twisting metal fibers and polyester, since both the spun yarns are under tension during twisting, the two kinds of spun yarns are not stretched to the same extent due to the different tensile properties of the spun yarns, and thus, after the spun yarns are twisted, the spun yarns are shrunk to different extents, so that the twisted spun yarns in the spun yarns are wrinkled, and the quality of the spun yarns is affected.

Disclosure of Invention

The invention aims to provide a twisting machine which has the advantage that multiple kinds of spun yarns can be twisted under the condition of small tension.

The above object of the present invention is achieved by the following technical solutions: a twisting machine comprises a machine frame, a wire outlet device, a wire leading device and a wire collecting device, wherein the wire outlet device is positioned on the machine frame and comprises a wire outlet motor, a wire outlet main shaft driven by the wire outlet motor to rotate, at least two wire outlet rollers and a transmission assembly driving the wire outlet rollers to rotate along with the wire outlet main shaft, the wire leading device comprises a spun yarn caching mechanism, the spun yarn caching mechanism comprises a caching groove and a detection assembly detecting whether spun yarns in the caching groove are used up or not, and when the detection assembly detects that no spun yarns exist in the caching groove, the wire outlet motor drives the wire outlet rollers to pay off and close in a delayed mode.

By adopting the technical scheme, when the detection assembly detects that no spun yarn exists in the cache groove, the yarn outlet motor is started to drive the yarn outlet roller to rotate, and the spun yarn wound on the bobbin fixed on the yarn outlet roller is discharged when the yarn outlet roller rotates. The spun yarn discharged is stored in the buffer groove in advance, and when the winding device winds the yarn in a winding mode, the spun yarn in the buffer groove is driven to wind the yarn until the yarn in the buffer groove is wound completely, and then the next cycle is started. The yarn outlet motor is started circularly and not started straight, so that the phenomenon that the spun yarn fed out at one time is too much, the spun yarn fed out at the back presses the spun yarn at the front, and the force required for pulling the spun yarn is increased can be avoided. Since the spun yarn is always twisted in a state of low tension, the problem of low quality yarn due to different degrees of stretch can be avoided when twisting a plurality of different yarns.

The invention is further configured to: the wire outgoing device is characterized in that a first mounting plate is arranged on the rack, the wire outgoing motor is fixedly connected with the first mounting plate, a wire outgoing main shaft fixedly connected with a wire outgoing shaft of the wire outgoing motor penetrates out of the first mounting plate, a first driving gear fixedly connected with one end of the wire outgoing main shaft penetrating out of the first mounting plate is arranged, the wire outgoing rollers are rotatably connected with the first mounting plate, and a first driven gear meshed with the first driving gear is fixedly arranged on each wire outgoing roller.

By adopting the technical scheme, the wire outlet motor and the wire outlet roller are arranged through the first mounting plate, the wire outlet motor drives the wire outlet main shaft to rotate, and then the wire outlet roller is driven to rotate through the transmission of the first driving gear and the first driven gear and simultaneously discharges various spun yarns to be twisted.

The invention is further configured to: every the circumference side equipartition shaping of going out the line roller has three extrusion groove, all is equipped with the extrusion piece in every extrusion groove, passes through spring coupling between extrusion piece and the extrusion groove bottom.

Through adopting above-mentioned technical scheme, the spring drives the extrusion piece and outwards extrudees for the extrusion piece supports tightly fixedly from inside to outside the inner wall that compresses tightly the spool.

The invention is further configured to: the outer surface of the extrusion block is an arc-shaped surface matched with the inner wall of the wire barrel and tightly abutted against the outer surface of the wire barrel, and the side surface of the extrusion block, far away from the first mounting plate, inclines towards one side of the first mounting plate towards the direction far away from the spring.

Through adopting above-mentioned technical scheme, the extrusion piece sets to the arcwall face so that the butt joint piece middle part supports tight bobbin inner wall better. The side face of the extrusion block is inclined, so that the extrusion block can be pressed into the extrusion groove through inclined plane extrusion when the bobbin is sleeved on the wire outlet roller, and the bobbin is more convenient to install.

The invention is further configured to: the position that lies in every roller below of being qualified for the next round of competitions on the first mounting panel all is equipped with the wire piece with first mounting panel fixed connection, and the wire piece is semicircle arc and the wire piece is to the direction of keeping away from first mounting panel slope down.

By adopting the technical scheme, the thread discharged from the thread bobbin fixed on the thread discharging roller is guided by the semicircular arc-shaped thread guide sheet and falls into the cache groove downwards along the inclined plane of the thread guide sheet, so that the discharged spun yarn is prevented from falling onto other thread discharging rollers to be wound and wound.

The invention is further configured to: and an avoiding groove is formed in the position, corresponding to the meshing position of the first driving gear and the first driven gear, on the wire sheet.

Through adopting above-mentioned technical scheme, dodge first driving gear and second driving gear meshing department through avoiding the groove and be hindered by the wire piece.

The invention is further configured to: the detection subassembly is including setting up Contraband type frame in the buffer slot top, installing the metal pole on Contraband type frame and being located Contraband type frame and conducting contact who switches on when being connected with the metal pole electricity, the one end of metal pole is passed through metal shrapnel and Contraband type frame and is welded even, the other end tilt up of metal pole and the welding has the limiting plate on the terminal surface, the welding has the current conducting plate that extends to the conducting contact below on the limiting plate, be connected with the extension spring between the one end that the metal pole is close to the limiting plate and the horizontal pole of Contraband type frame.

By adopting the technical scheme, when the spun yarn in the cache groove is used up, the spun yarn is tightened, the tightened spun yarn is attached to the metal rod and drives the metal rod to move upwards, so that the conductive plate is in contact conduction with the conductive contact, and the outgoing line motor is started at the moment. The limiting plate can prevent the spun yarn from separating from the metal rod upwards.

The invention is further configured to: the wire leading device further comprises a wire bundling mechanism, the wire bundling mechanism comprises a wire bundling plate, and a wire bundling hole with the diameter gradually reduced from one side facing the cache groove to one side far away from the cache groove is formed in the middle of the wire bundling plate.

By adopting the technical scheme, the multiple kinds of spun yarns are bundled together in parallel through the yarn bundling hole, so that the spun yarns can be twisted and wound in the subsequent process.

The invention is further configured to: the wire leading device further comprises a tensioning mechanism, the tensioning mechanism comprises a tensioning column located on one side, back to the cache groove, of the wire bundling plate, and a cylindrical tensioning rod is welded on the side face of the upper end of the tensioning column.

By adopting the technical scheme, the combined spun yarns are wound around the tensioning rod and then wound up by the winding device, the spun yarns are tensioned by the small friction force between the spun yarns and the tensioning rod, and the spun yarns are prevented from being folded together due to winding in a folded state.

The invention is further configured to: the take-up device comprises a take-up motor, a take-up roller connected with the take-up motor and a reciprocating mechanism for uniformly winding yarns on the take-up roller; the take-up roller comprises a solid shaft fixedly connected with an output shaft of the take-up motor and an inflatable shaft fixedly connected with the solid shaft; the reciprocating mechanism comprises a second driving gear fixed on the solid shaft, a guide rod positioned on the side surface of the wire take-up roller, a reciprocating screw rod parallel to the guide rod, a second driven gear fixed on the reciprocating screw rod and meshed with the second driving gear, and a wire ring which is connected to the guide rod in a sliding mode and is in threaded fit with the reciprocating screw rod, wherein a wire guide hole is formed in the side surface of the wire ring.

Through adopting above-mentioned technical scheme, when receiving the line motor and driving receipts line roller and rotate the twisting and rolling yarn, drive reciprocal lead screw through second rotating gear and second driven gear and rotate for the wire ring is along reciprocal lead screw reciprocating motion. Because the yarn is wound by the bobbin sleeved on the yarn winding roller after passing through the yarn guide hole, the yarn can be uniformly wound on the bobbin.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the spun yarn in the buffer groove is driven to be wound until the yarn in the buffer groove is wound, and then the next circulation is started.

2. When the spun yarns in the buffer groove are used up, the spun yarns are tightened, the tightened spun yarns are attached to the metal rod and drive the metal rod to move upwards, the conductive plate is in contact conduction with the conductive contact, the outgoing line motor starts outgoing lines, and the spun yarns are prevented from being twisted and wound under the condition of high tension force.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

FIG. 2 is a schematic sectional view of a wire outlet device in an embodiment;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a schematic structural view of a spun yarn buffer mechanism in the embodiment;

FIG. 5 is a schematic structural view of a wire-binding mechanism and a tensioning mechanism in the embodiment;

fig. 6 is a schematic structural view of the wire take-up device in the embodiment.

Reference numerals: 1. a frame; 2. a wire outlet device; 3. a wire-guiding device; 4. a take-up device; 5. a wire outlet motor; 6. a wire outlet main shaft; 7. a wire outlet roller; 8. a transmission assembly; 9. a first mounting plate; 10. a first drive gear; 11. a first driven gear; 12. extruding a groove; 13. extruding the block; 14. a spring; 15. a wire sheet; 16. an avoidance groove; 17. a spun yarn buffer mechanism; 18. a wire bundling mechanism; 19. a tensioning mechanism; 20. a cache slot; 21. a detection component; 22. contraband type frame; 23. a metal rod; 24. a conductive contact; 25. a metal spring sheet; 26. a limiting plate; 27. a conductive plate; 28. a tension spring; 29. a wire bundling plate; 30. a wire harness hole; 31. a tension column; 32. a tension rod; 33. a take-up motor; 34. a wire take-up roller; 35. a reciprocating mechanism; 36. a second mounting plate; 37. a solid shaft; 38. an inflatable shaft; 39. a second driving gear; 40. a guide bar; 41. a reciprocating screw rod; 42. a second driven gear; 43. a wire loop; 44. a wire guide hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the twisting machine comprises a frame 1, a wire outlet device 2, a wire leading device 3 and a wire collecting device 4 which are positioned on the frame 1.

As shown in fig. 1 and 2, the wire outlet device 2 includes a wire outlet motor 5, a wire outlet main shaft 6 connected to the wire outlet motor 5, a wire outlet roller 7, and a transmission assembly 8 for driving the wire outlet roller 7 to rotate along with the wire outlet main shaft 6. The outgoing line motor 5 is arranged on a first mounting plate 9 of the frame 1, and the outgoing line main shaft 6 penetrates through the first mounting plate 9 and is driven to rotate by the outgoing line motor 5. Eight outlet rollers 7 are uniformly distributed around the outlet main shaft 6 in a circle and are rotatably connected with the first mounting plate 9, and the distance between the axis of each outlet roller 7 and the axis of the outlet main shaft 6 is equal. The transmission assembly 8 comprises a first driving gear 10 fixed at one end of the outgoing main shaft 6 penetrating through the first mounting plate 9 and first driven gears 11 fixedly connected to each outgoing roller 7, all the first driven gears 11 are identical, and the first driving gear 10 is meshed with all the first driven gears 11 simultaneously. When the outgoing line motor 5 drives the outgoing line main shaft 6 to rotate, the eight outgoing line rollers 7 are driven to rotate at the same angular speed through the transmission of the first driving gear 10 and the first driven gear 11.

As shown in fig. 2 and 3, three extrusion grooves 12 are uniformly formed on the circumferential side surface of each wire outlet roller 7, an extrusion block 13 is arranged in each extrusion groove 12, and the extrusion blocks 13 are connected with the bottoms of the extrusion grooves 12 through springs 14. The outer surface of the extrusion block 13 is an arc-shaped surface which is matched and tightly propped against the inner wall of the bobbin, and the side surface of the extrusion block 13, which is far away from the first mounting plate 9, inclines towards the direction far away from the spring 14 towards one side of the first mounting plate 9. When the bobbin is sleeved on the wire outlet roller 7, the bobbin extrudes the extrusion block 13 into the extrusion groove 12, so that the extrusion block 13 is propped against the inner wall of the bobbin under the action of the spring 14 to fix the bobbin. The position that is located every roller 7 below of being qualified for the next round of competitions on first mounting panel 9 all is equipped with wire piece 15, and wire piece 15 is half-circular arc and terminal surface and welds with first mounting panel 9, and wire piece 15 down inclines to the direction of keeping away from first mounting panel 9. The wire guide 15 is provided with an avoiding groove 16 corresponding to the position where the first driving gear 10 and the first driven gear 11 are engaged.

As shown in fig. 1 and 4, the yarn threading device 3 includes a spun yarn buffer mechanism 17, a yarn bundling mechanism 18, and a tension mechanism 19. The spun yarn buffer mechanism 17 includes a buffer groove 20 and a detection unit 21 for detecting whether the spun yarn in the buffer groove 20 runs out. The buffer slot 20 is located below the end of the conductor tab 15 remote from the first mounting plate 9. The inspection module 21 includes Contraband-type frames 22 mounted above the buffer slots 20, a metal rod 23 mounted on Contraband-type frame 22, and conductive contacts 24 on Contraband-type frame 22 for electrical connection with metal rod 23. The metal rod 23 is a hollow metal round rod, and one end of the metal rod 23 is welded with a metal elastic sheet 25 and is welded with the Contraband-shaped frame 22 through the metal elastic sheet 25. The other end of the metal rod 23 is inclined upward, and a stopper plate 26 having an area larger than the sectional area of the metal rod 23 is welded to the end surface of the end. The highest point of the metal bar 23 is lower than the lowest exit roller 7 height. The conductive contact 24 is located on the lower surface of the cross bar of the Contraband-shaped frame 22, and the limiting plate 26 is soldered with a conductive plate 27 extending below the conductive contact 24. A tension spring 28 is connected between one end of the metal rod 23 close to the limiting plate 26 and the cross bar of the Contraband-shaped frame 22, and a force is applied to the metal rod 23 through the tension spring 28, so that only a small distance is left between the conductive plate 27 and the conductive contact 24.

As shown in fig. 1 and 4, the conductive plate 27 and the conductive contact 24 are used as contact closing points of the switch, when the conductive plate 27 and the conductive contact 24 are conducted, the switch is closed, the outgoing line motor 5 starts the bobbin on the outgoing line roller 7 to pay off, and the outgoing line motor 5 is turned off in a delayed mode through the delay relay.

As shown in fig. 1 and 5, the wire binding mechanism 18 includes a wire binding plate 29 located on the side of the buffer tank 20 away from the wire outlet device 2, and a wire binding hole 30 is formed in the middle of the wire binding plate 29, and the diameter of the wire binding hole 30 gradually decreases from the side facing the buffer tank 20 to the side away from the buffer tank 20. The tensioning mechanism 19 comprises a tensioning column 31 on the side of the wire bundling plate 29 facing away from the buffer slot 20, and a cylindrical tensioning rod 32 is welded on the side of the upper end of the tensioning column 31.

As shown in fig. 1 and 6, the take-up device 4 includes a take-up motor 33, a take-up roller 34 connected to the take-up motor 33, and a reciprocating mechanism 35 for uniformly winding the yarn on the take-up roller 34. The take-up motor 33 is mounted to a second mounting plate 36 on the frame 1. The wire take-up roller 34 comprises a solid shaft 37 fixedly connected with an output shaft of the wire take-up motor 33 and an air expansion shaft 38 fixedly connected with the solid shaft 37, the air expansion shaft 38 and the solid shaft 37 are coaxial, and the solid shaft 37 and the air expansion shaft 38 are driven to rotate by the wire take-up motor 33. A second driving gear 39 is fixedly connected to the solid shaft 37, a guide rod 40 is fixedly connected to the second mounting plate 36, a reciprocating screw rod 41 parallel to the guide rod 40 is rotatably connected to the second mounting plate, and a second driven gear 42 engaged with the second driving gear 39 is fixedly connected to the reciprocating screw rod 41. The reciprocating screw rod 41 and the guide rod 40 are sleeved with a wire guide ring 43, the wire guide ring 43 is in sliding connection with the guide rod 40 and is in threaded fit with the reciprocating screw rod 41, and the reciprocating screw rod 41 drives the wire guide ring 43 to move back and forth along the reciprocating screw rod 41 when rotating. The side of the thread guiding ring 43 is provided with a thread guiding hole 44, and the yarn is wound on a bobbin fixed with the inflatable shaft 38 after passing through the thread guiding hole 44. The second driving gear 39, the second driven gear 42, the reciprocating screw 41, the guide rod 40, and the wire loop 43 form a reciprocating mechanism 35.

The specific working process is as follows:

a plurality of fine yarn bobbins to be twisted are sleeved on the take-off roller 7. The outlet motor 5 drives the outlet roller 7 to rotate, the bobbin on the outlet roller 7 rotates to discharge the spun yarn wound thereon, the spun yarn falls into the buffer slot 20 along the wire guide 15, and the outlet motor 5 stops operating after a set time. The spun yarn is wound through the yarn-winding hole 30, then tensioned by the tension rod 32, and then wound by the bobbin on the yarn-winding roller 34 which is driven to rotate by the yarn-winding motor 33. After the spun yarn in the buffer groove 20 is completely wound, the spun yarn is tightened to apply acting force to the metal rod 23 so as to drive the metal rod 23 to move upwards. After the conductive plate 27 and the conductive contact 24 are conducted, the wire outlet motor 5 is started again, and wire is paid out at a speed higher than the wire take-up speed.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.