Leather carving banding grinding device
阅读说明:本技术 一种皮雕封边打磨装置 (Leather carving banding grinding device ) 是由 丛龙强 于 2020-07-17 设计创作,主要内容包括:本发明涉及一种皮雕封边打磨装置,其包括用于夹持待打磨皮革的夹持装置以及用于对所述待打磨皮革进行打磨的打磨棒自动打磨装置,所述夹持装置上设有自动复位装置,所述待打磨皮革在外力作用下可发生位移,失去外力后通过所述自动复位装置自动复位;所述打磨棒自动打磨装置包括环形设置的若干不同型号的打磨棒、驱动若干所述打磨棒环形转动的旋转装置、驱动所述打磨棒自转的链条驱动装置、驱动所述打磨棒升降的升降装置以及驱动所述打磨棒横向和纵向移动的横向滑移装置和纵向滑移装置。(The invention relates to a leather carving edge sealing and polishing device which comprises a clamping device and an automatic polishing rod polishing device, wherein the clamping device is used for clamping leather to be polished, the automatic polishing rod polishing device is used for polishing the leather to be polished, an automatic reset device is arranged on the clamping device, the leather to be polished can displace under the action of external force, and the automatic reset device automatically resets after the external force is lost; the automatic grinding device of the grinding rod comprises a plurality of grinding rods of different models and a plurality of drives, wherein the grinding rods are annularly arranged, and the grinding rods are annularly rotated by the rotating device, the chain driving device for autorotation of the grinding rods, the lifting device for lifting the grinding rods and the driving device for transversely and longitudinally moving the grinding rods and the longitudinal sliding device.)
1. The utility model provides a leather carving banding grinding device which characterized in that: the automatic leather polishing device comprises a clamping device for clamping leather (21) to be polished and an automatic polishing rod polishing device for polishing the leather (21) to be polished, wherein the clamping device is provided with an automatic reset device, the leather (21) to be polished can displace under the action of external force, and the leather is automatically reset through the automatic reset device after the external force is lost; the automatic grinding device of the grinding rod comprises a plurality of grinding rods (30) of different models and a plurality of drives, wherein the grinding rods (30) are annularly arranged, the rotating device is annularly rotated to the grinding rods (30), the chain driving device is used for driving the grinding rods (30) to rotate, the lifting device is used for driving the grinding rods (30) to lift up and down, and the transverse sliding device and the longitudinal sliding device are used for driving the grinding rods (30) to transversely and longitudinally move.
2. The leather carving edge sealing and grinding device according to claim 1, characterized in that: still including being used for right wait to polish leather (21) and carry out the automatic grinding device of abrasive paper of polishing, it includes drive abrasive paper (47) and follows wait to polish leather (21) side edge and do abrasive paper drive arrangement, the drive of arc motion about abrasive paper (47) goes up and down elevating gear and drive horizontal sliding device and the vertical sliding device of horizontal and longitudinal movement of abrasive paper (47).
3. The leather carving edge sealing and grinding device according to claim 1 or 2, characterized in that: the clamping device comprises a base (1), guide posts (2) vertically arranged at four corners of the base (1) and a mounting plate (3) arranged at the top ends of the guide posts (2), a connecting plate (5) and a pressing plate (6) are arranged between the base (1) and the mounting plate (3), through holes corresponding to the guide posts (2) are formed in the connecting plate (5) and the pressing plate (6), a plurality of pressing rods (7) are fixedly arranged on the pressing plate (6), springs (9) are sleeved on the pressing rods (7), the upper ends of the pressing rods (7) penetrate through the connecting plate (5) and then are fixedly connected with limiting blocks (8), and through holes corresponding to the pressing rods (7) are formed in the connecting plate (5); the bottom of the mounting plate (3) is fixedly provided with a lifting oil cylinder (4), and an oil cylinder rod of the lifting oil cylinder (4) is fixedly connected with the connecting plate (5).
4. The leather carving edge sealing and grinding device according to claim 3, characterized in that: the automatic resetting device comprises a first lower positioning plate (10) and a first upper positioning plate (11) which are arranged between the pressing plate (6) and the base (1), and a plurality of second springs (12) are arranged between the base (1) and the first lower positioning plate (10) and between the pressing plate (6) and the first upper positioning plate (11).
5. The leather carving edge sealing and grinding device according to claim 3, characterized in that: the automatic resetting device comprises a second lower positioning plate (13) and a second upper positioning plate (14) which are arranged between the pressing plate (6) and the base (1), sliding resetting devices are arranged between the base (1) and the second lower positioning plate (13) and between the pressing plate (6) and the second upper positioning plate (14), the sliding resetting devices comprise guide grooves (18) which are formed in opposite surfaces of the pressing plate (6) and the base (1), a plurality of supporting legs (15) corresponding to the guide grooves (18) are arranged on the second upper positioning plate (14) and the second lower positioning plate (13), and free ends of the supporting legs (15) are hinged with rollers (17); side sliding grooves (19) are formed in two sides of the guide groove (18), and side sliding plates (16) corresponding to the side sliding grooves (19) are arranged in two sides of the supporting leg (15); a tension spring (20) is arranged between the support leg (16) at the rightmost end and the right end of the guide groove (18).
6. The leather carving edge sealing and grinding device according to claim 1, characterized in that: the grinding rods (30) are annularly arranged on the side surface of the cylindrical mounting seat (27) through an upper clamping plate and a lower clamping plate (29), and a rotating device is arranged at the bottom of the mounting seat (27) and is a rotating oil cylinder (58); the grinding rod (30) is arranged between the two clamping plates (29) above and below the grinding rod through a first rotating shaft (30-1), a bearing is arranged between the first rotating shaft (30-1) and the clamping plates (29), and a second plane thrust ball bearing (31) is arranged between the grinding rod (30) and the clamping plates (29); pivot one (30-1) upper end cover is equipped with driven sprocket (32), the upside splint (29) inboard adjustable be equipped with mounting bracket one (37), on mounting bracket one (37) through pivot two (36) coaxial drive sprocket (34) and driven gear (35) of being equipped with, link to each other through drive chain (33) between driven sprocket (32) and drive sprocket (34), mount pad (27) middle part be equipped with through mounting bracket two (40) with driven gear (35) engaged with driving gear (38), driving gear (38) through pivot three (39) with locate servo motor one (41) on mounting bracket two (40) link to each other, elevating gear, lateral sliding device and longitudinal sliding device locate the rotary device below.
7. The leather carving edge sealing and grinding device according to claim 2, characterized in that: the abrasive paper driving device comprises an arc-shaped mounting shell (46), abrasive paper (47) arranged on the mounting shell and a power device, wherein an arc-shaped groove (46-1) is formed in the middle of the mounting shell (46) in the vertical direction, arc-shaped side sliding grooves (46-2) are formed in two sides of the arc-shaped groove (46-1), the abrasive paper (47) is detachably and fixedly arranged on a fixing plate (49), a square connecting rod (50) is fixedly arranged on the fixing plate (49), the width of the connecting rod (50) is matched with that of the arc-shaped groove (46-1), and arc-shaped sliding blocks (50-1) matched with the arc-shaped side sliding grooves (46-2) are arranged on two sides of the connecting rod (50); the power device comprises guide wheels I (52) arranged at the upper end and the lower end of the installation shell (46) and positioned at the left side and the right side of the arc-shaped groove (46-1) and wire twisting wheels (54) arranged at the two sides of the installation shell (46), two wire twisting wheels (54) are coaxially arranged in a group and fixedly arranged on the installation shell (46) through a mounting frame III (55), two ends of the same wire rope (53) are reversely wound on the two wire twisting wheels (54) in the same group, the middle part of the wire rope (53) is wound around and tightened on the two guide wheels I (52) on the same side of the arc-shaped groove (46-1), and the wire twisting wheels (54) are connected with a servo motor II (56); fixing rods (51) are symmetrically and fixedly arranged on the left side and the right side of the connecting rod (50), and a steel wire rope (53) between the two guide wheels (52) positioned on the same side of the arc-shaped groove (46-1) is fixedly connected with the fixing rods (51); the mounting shell (46) is connected with the supporting arm (44) through a connecting arm (45), and the lifting device, the transverse sliding device and the longitudinal sliding device are arranged below the supporting arm (44).
8. The leather carving edge sealing and grinding device as claimed in claim 6 or 7, wherein: the lifting device comprises a lifting block (25) and a longitudinal sliding block (24) arranged below the lifting block, a plurality of guide rods (25-1) are arranged at the bottom of the lifting block (25), a plurality of guide holes (24-2) matched with the guide rods (25-1) are formed in the longitudinal sliding block (24), a first mounting groove (24-3) is formed in the longitudinal sliding block (24), a worm gear lead screw lifter (26) is arranged in the first mounting groove (24-3), and the upper end of the worm gear lead screw lifter (26) is connected with the bottom end of the lifting block (25); the longitudinal sliding device comprises a longitudinal sliding block (24), the longitudinal sliding block (24) is arranged above the transverse sliding plate (23), a longitudinal oil cylinder (43) is longitudinally and fixedly arranged on the transverse sliding plate (23), an oil cylinder rod of the longitudinal oil cylinder (43) is connected with the longitudinal sliding block (24), and the bottom of the longitudinal sliding block (24) can be longitudinally and slidably clamped on the transverse sliding plate (23); the transverse sliding device comprises a transverse sliding plate (23), the transverse sliding plate (23) is arranged above the bottom plate (22), a transverse oil cylinder (42) is fixedly arranged on the bottom plate (22) in the transverse direction, an oil cylinder rod of the transverse oil cylinder (42) is connected with the transverse sliding plate (23), and the bottom of the transverse sliding plate (23) can be clamped on the bottom plate (22) in a transverse sliding mode.
9. The leather carving edge sealing and grinding device according to claim 6, characterized in that: the grinding rod (30) upside the splint (29) are gone up and have been seted up along splint (29) length direction and adjust spout (29-1), mounting bracket (37) bottom both sides are equipped with fixture block three (37-1) and screw hole (37-2), will through the bolt mounting bracket (37) are fixed in adjusting spout (29-1), mounting bracket (37) top and bottom are equipped with the hinge hole that is used for the hinge pivot two (36).
10. The leather carving edge sealing and grinding device according to claim 7, characterized in that: sandpaper (47) are arranged on the fixing plate (49) through buffer pieces (48), and the buffer pieces (48) are made of sponge or silica gel.
Technical Field
The invention relates to a leather carving edge sealing and polishing device, and particularly belongs to the technical field of leather carving manufacturing.
Background
At present, when leather carving is carried out, edge sealing or edge dyeing needs to be carried out on the edge of the cut leather, so that the edge of a leather product is smoother and more attractive. The existing leather edge grinding is generally carried out by adopting sand paper, a grinding rod or the combination of the sand paper and the grinding rod, wherein the grinding rod is simple in structural design, only a plurality of annular arc grooves are formed in the side surface of the round rod, when the leather edge grinding machine is used, a leather maker needs to hold the round rod by hand, the edge part of the leather is clamped in the arc grooves, and grinding is carried out back and forth after oiling, so that the grinding efficiency is low, and when some thinner leathers are ground, the grinding rod is easy to bend and deform, and the grinding effect is influenced; and the leather craftsman is time consuming and labor consuming when sanding with sandpaper. Therefore, it is urgent to need to design a leather carving banding grinding device that degree of automation is high, and it is effectual to polish, imitates the artifical mode of polishing and polishes, takes place bending deformation when preventing that the leather from polishing, improves the efficiency of polishing.
Disclosure of Invention
The invention aims to solve the technical problem of providing a leather carving edge sealing polishing device which has high automation degree and good polishing effect and performs polishing by imitating a manual polishing mode, so that the leather is prevented from bending and deforming during polishing, and the polishing efficiency is improved.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a leather carving edge sealing and polishing device comprises a clamping device for clamping leather to be polished and an automatic polishing rod polishing device for polishing the leather to be polished, wherein the clamping device is provided with an automatic reset device; the automatic grinding device of the grinding rod comprises a plurality of grinding rods of different models and a plurality of drives, wherein the grinding rods are annularly arranged, and the grinding rods are annularly rotated by the rotating device, the chain driving device for autorotation of the grinding rods, the lifting device for lifting the grinding rods and the driving device for transversely and longitudinally moving the grinding rods and the longitudinal sliding device.
As a further improvement of the invention, the automatic sanding device for sanding the leather to be sanded comprises a sanding paper driving device for driving sanding paper to do vertical arc motion along the side edge of the leather to be sanded, a lifting device for driving the sanding paper to lift, and a transverse sliding device and a longitudinal sliding device for driving the sanding paper to move transversely and longitudinally.
As a further improvement of the invention, the clamping device comprises a base, guide posts vertically arranged at four corners of the base and a mounting plate arranged at the top ends of the guide posts, a connecting plate and a pressing plate are arranged between the base and the mounting plate, through holes corresponding to the guide posts are arranged on the connecting plate and the pressing plate, a plurality of pressing rods are fixedly arranged on the pressing plate, springs I are sleeved on the pressing rods, the upper ends of the pressing rods are fixedly connected with limiting blocks after penetrating through the connecting plate, and through holes corresponding to the pressing rods are arranged on the connecting plate; the bottom of the mounting plate is fixedly provided with a lifting oil cylinder, and an oil cylinder rod of the lifting oil cylinder is fixedly connected with the connecting plate.
As a further improvement of the invention, the automatic resetting device comprises a first lower positioning plate and a first upper positioning plate which are arranged between the pressing plate and the base, and a plurality of second springs are arranged between the base and the first lower positioning plate and between the pressing plate and the first upper positioning plate.
As a further improvement of the invention, the automatic reset device comprises a second lower positioning plate and a second upper positioning plate which are arranged between the pressing plate and the base, a sliding reset device is arranged between the base and the second lower positioning plate and between the pressing plate and the second upper positioning plate, the sliding reset device comprises guide grooves which are arranged on opposite surfaces of the pressing plate and the base, a plurality of support legs corresponding to the guide grooves are arranged on the second upper positioning plate and the second lower positioning plate, and free ends of the support legs are hinged with rollers; side sliding grooves are formed in two sides of the guide groove, and side sliding plates corresponding to the side sliding grooves are arranged on two sides of the supporting leg; and a tension spring is arranged between the support leg at the rightmost end and the right end of the guide groove.
As a further improvement of the invention, a plurality of grinding rods are annularly arranged on the side surface of a cylindrical mounting seat through an upper clamping plate and a lower clamping plate, and a rotating device is arranged at the bottom of the mounting seat and is a rotating oil cylinder; the grinding rod is arranged between the two clamping plates above and below the grinding rod through a first rotating shaft, a bearing is arranged between the first rotating shaft and the clamping plates, and a second plane thrust ball bearing is arranged between the grinding rod and the clamping plates; an upper end cover of pivot is equipped with driven sprocket, the upside splint inboard is adjustable be equipped with mounting bracket one, on the mounting bracket one through two coaxial drive sprocket and the driven gear of being equipped with of pivot, link to each other through drive chain between driven sprocket and the drive sprocket, the mount pad middle part be equipped with through mounting bracket two with driven gear engaged with driving gear, the driving gear through the pivot three with locate servo motor one on the mounting bracket two links to each other, elevating gear, lateral sliding device and longitudinal sliding device locate the rotary device below.
As a further improvement of the invention, the abrasive paper driving device comprises an arc-shaped mounting shell, abrasive paper arranged on the mounting shell and a power device, wherein an arc-shaped groove is formed in the middle of the mounting shell along the vertical direction, arc-shaped side sliding grooves are formed in two sides of the arc-shaped groove, the abrasive paper is detachably and fixedly arranged on a fixing plate, a square connecting rod is fixedly arranged on the fixing plate, the width of the connecting rod is matched with that of the arc-shaped groove, and arc-shaped sliding blocks matched with the arc-shaped side sliding grooves are arranged on two sides of the connecting rod; the power device comprises first guide wheels arranged at the upper end and the lower end of the installation shell and positioned at the left side and the right side of the arc-shaped groove and stranded wire wheels arranged at the two sides of the installation shell, the two stranded wire wheels are coaxially arranged in a group and fixedly arranged on the installation shell through a third installation frame, two ends of a same steel wire rope are reversely wound on the two stranded wire wheels in the same group, the middle part of the steel wire rope is wound and tightened from the two first guide wheels at the same side of the arc-shaped groove, and the stranded wire wheels are connected with a second servo motor; the left side and the right side of the connecting rod are symmetrically and fixedly provided with fixed rods, and a steel wire rope between the two guide wheels I positioned on the same side of the arc-shaped groove is fixedly connected with the fixed rods; the mounting shell is connected with the supporting arm through a connecting arm, and the lifting device, the transverse sliding device and the longitudinal sliding device are arranged below the supporting arm.
As a further improvement of the invention, the lifting device comprises a lifting block and a longitudinal sliding block arranged below the lifting block, the bottom of each lifting block is provided with a plurality of guide rods, the longitudinal sliding block is provided with a plurality of guide holes matched with the guide rods, the longitudinal sliding block is provided with a first mounting groove, a worm gear lead screw lifter is arranged in the first mounting groove, and the upper end of the worm gear lead screw lifter is connected with the bottom end of the lifting block; the longitudinal sliding device comprises a longitudinal sliding block, the longitudinal sliding block is arranged above the transverse sliding plate, a longitudinal oil cylinder is longitudinally and fixedly arranged on the transverse sliding plate, an oil cylinder rod of the longitudinal oil cylinder is connected with the longitudinal sliding block, and the bottom of the longitudinal sliding block can be longitudinally and slidably clamped on the transverse sliding plate; the transverse sliding device comprises a transverse sliding plate, the transverse sliding plate is arranged above the bottom plate, a transverse oil cylinder is transversely and fixedly arranged on the bottom plate, an oil cylinder rod of the transverse oil cylinder is connected with the transverse sliding plate, and the bottom of the transverse sliding plate can be transversely clamped on the bottom plate in a sliding mode.
As a further improvement of the invention, an adjusting chute is formed in the clamping plate on the upper side of the polishing rod along the length direction of the clamping plate, a third clamping block and a threaded hole are formed in two sides of the bottom of the first mounting frame, the first mounting frame is fixed in the adjusting chute through a bolt, and hinge holes for hinging the second rotating shaft are formed in the top and the bottom of the first mounting frame.
As a further improvement of the invention, the sand paper is arranged on the fixing plate through a buffer part, and the buffer part is made of sponge or silica gel.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the leather polishing machine is simple in structure and high in automation degree, polishing is carried out according to a manual polishing mode, bending deformation of leather during polishing is avoided, and polishing efficiency is improved. The leather to be polished is clamped through the clamping device, the automatic reset device is arranged to prevent the sand paper or the polishing rod from deforming the top of the leather to be polished, and the jacking force of the automatic reset device can be adjusted through adjusting the tightness of the second spring and the tension spring; the automatic polishing device for the polishing rods is provided with a plurality of polishing rods of different types, the polishing rods are selected through the rotating device according to the thickness of the leather to be polished, the polishing rods rotate under the action of the chain driving device, and the longitudinal sliding device and the transverse sliding device are combined to enable the polishing rods to be attached to the side edge of the leather to be polished and rotate reversely relative to the moving direction of the longitudinal sliding device, so that the relative displacement is improved, and the polishing efficiency is greatly improved; the automatic sand paper grinding device does up-and-down arc motion along the side edge of the leather to be ground through the sand paper driving device, and the longitudinal sliding device and the transverse sliding device are combined, so that the sand paper can repeatedly and automatically grind the leather to be ground, and the grinding efficiency is greatly improved; the polishing mode and the process of the automatic polishing device for the polishing rod and the automatic polishing device for the abrasive paper are carried out according to a manual polishing mode, the polishing position, the polishing times and the jacking force of the automatic resetting device are combined with manual polishing, the actual working condition of the polishing device is adjusted, and the optimal polishing program is set through the control element.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic front view of the present invention.
Fig. 2 is a partially enlarged schematic view at a in fig. 1.
Fig. 3 is a schematic top view of the present invention.
Fig. 4 is a partially enlarged schematic view at B in fig. 3.
Fig. 5 is a front view of the mounting base of the present invention.
Fig. 6 is another schematic front view of the present invention.
Fig. 7 is a partially enlarged schematic view at C in fig. 6.
Fig. 8 is a partially enlarged schematic view at D in fig. 6.
Fig. 9 is a schematic diagram of the right-side structure of fig. 8.
Fig. 10 is a partially enlarged schematic view at E in fig. 8.
Fig. 11 is a partially enlarged schematic view at F in fig. 8.
Wherein: 1 base, 2 guide posts, 3 mounting plates, 4 lifting oil cylinders, 5 connecting plates, 6 pressing plates, 7 pressing rods, 8 limiting blocks, 9 first springs, 10 first lower positioning plates, 11 first upper positioning plates, 12 second springs, 13 second lower positioning plates, 14 second upper positioning plates, 15 supporting legs, 16 side sliding plates, 17 rollers, 18 guide grooves, 19 side sliding grooves, 20 tension springs, 21 leather to be polished, 22 bottom plates, 22-1 transverse sliding grooves, 23 transverse sliding plates, 23-1 first clamping blocks, 23-2 longitudinal sliding grooves, 24 longitudinal sliding blocks, 24-1 second clamping blocks, 24-2 guide holes, 24-3 first mounting grooves, 25 lifting blocks, 25-1 guide rods, 25-2 second mounting grooves, 26 worm screw rod lifters, 27 mounting seats, 28 plane thrust one, 29 clamping plates, 29-1 adjusting sliding grooves, 30 grinding rod ball bearings, 30-1 first rotating shafts, 31 planar thrust ball bearing II, 32 driven chain wheel, 33 transmission chain, 34 driving chain wheel, 35 driven gear, 36 rotating shaft II, 37 mounting rack I, 37-1 clamping block III, 37-2 threaded hole, 38 driving gear, 39 rotating shaft III, 40 mounting rack II, 41 servo motor I, 42 transverse oil cylinder, 43 longitudinal oil cylinder, 44 supporting arm, 45 connecting arm, 46 mounting shell, 46-1 arc-shaped groove, 46-2 arc-shaped side sliding groove, 47 sand paper, 48 buffer piece, 49 fixing plate, 50 connecting rod, 50-1 arc-shaped sliding block, 51 fixing rod, 52 guide wheel I, 53 steel wire rope, 54 stranding wheel, 55 mounting rack III, 56 servo motor II, 57 guide wheel II and 58 rotary oil cylinder.
Detailed Description
For purposes of clarity and a complete description of the present invention, and the like, in conjunction with the detailed description, it is to be understood that the terms "central," "vertical," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the present invention, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
As shown in fig. 1 to 11, the leather carving edge sealing and polishing device includes a clamping device for clamping a
When polishing, can adopt
In the embodiment, the clamping device comprises a
As an implementation mode, the automatic resetting device comprises a first
As another embodiment, the automatic resetting device comprises a second lower positioning plate 13 and a second upper positioning plate 14 which are arranged between the
Through clamping device comes to treat the
In this embodiment, a plurality of the grinding rods 30 are annularly arranged on the side surface of the
Through adjusting the
The automatic grinding device of stick of polishing is equipped with the stick of polishing 30 of a plurality of different models, passes through according to waiting to
The abrasive paper driving device comprises an arc-
The two
The automatic sanding device of abrasive paper passes through abrasive paper drive arrangement follows treat that the
The lifting device comprises a lifting block 25 and a longitudinal sliding
The
The specific working mode is as follows:
polishing by a polishing rod:
fixing the
selecting a corresponding polishing rod 30 according to polishing requirements, rotating the corresponding polishing rod 30 to a station corresponding to the
the height of the arc-shaped groove on the polishing rod 30 is aligned with that of the
the grinding rod 30 is contacted with the side edge of the
the longitudinal sliding device drives the polishing rod 30 to do longitudinal reciprocating motion to polish the
Sanding with sand paper:
fixing the
selecting
the middle part of the mounting
the
through the drive of longitudinal sliding
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
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