Disclosure of Invention
In view of the above disadvantages in the prior art, the present invention is to provide a gripping and riveting integrated device for a sleeve.
The invention solves the technical problem and adopts the technical scheme that the grabbing and riveting integrated device for the sleeve comprises: the clamping system can clamp the sleeve and convey the sleeve to the riveting system;
the grasping system includes: a clamping assembly comprising: the first clamping piece is arranged on one side of the sleeve and is provided with a first clamping part; the second clamping piece is arranged on the other side of the sleeve and is provided with a second clamping part, and the second clamping piece can move along the first direction to reduce or increase the distance between the first clamping part and the second clamping part so as to clamp or release the sleeve; the conveying assembly is connected with the clamping assembly and can drive the clamping assembly to move along a second direction so as to convey the sleeve to the riveting piece; the first direction is perpendicular to the second direction;
the riveting system includes: the riveting piece comprises a first end plate and a second end plate which are arranged at intervals, wherein a first through hole is formed in the first end plate, a second through hole is formed in the second end plate, and the first through hole and the second through hole are arranged oppositely; the sleeve is arranged between the first end plate and the second end plate, one end of the sleeve is connected with the first end plate, and the other end of the sleeve is connected with the second end plate; the radiuses of the first through hole and the second through hole are smaller than the inner diameter of the sleeve; the riveting mechanism comprises a first riveting head and a second riveting head, the first riveting head is positioned on one side, away from the second end plate, of the first end plate, and the second riveting head is positioned on one side, away from the first end plate, of the second end plate; the outer diameters of the first squeeze riveting head and the second squeeze riveting head are smaller than the inner diameter of the sleeve, and are larger than the inner diameters of the first through hole and the second through hole.
Preferably, the clamping assembly further comprises: a sliding plate connected with the conveying assembly; the first guide rail is arranged on the sliding plate along a first direction, the first clamping piece is fixedly arranged on the sliding plate, the second clamping piece is connected with the first guide rail, and the second clamping piece can slide along the first direction relative to the guide rail; the first driving air cylinder is used for driving the second clamping piece to slide relative to the first guide rail;
the delivery assembly comprises: the fixed plate is provided with a second guide rail, the second guide rail is arranged along a second direction, and the sliding plate is arranged on the second guide rail in a sliding manner; and the second driving air cylinder is used for driving the sliding plate to slide relative to the second guide rail.
Preferably, the first clamping portion is arranged in an arc shape, and the first clamping portion is attached to the side wall of the sleeve; the second clamping part is provided with an elastic sheet, the elastic sheet is arranged in an arc shape, and the elastic sheet is attached to the side wall of the sleeve.
Preferably, the grasping system further includes: the positioning assembly comprises a positioning column arranged between the first clamping part and the second clamping part; the driving part is used for driving the positioning column to move along a third direction so as to extend into or separate from the sleeve; any two of the first direction, the second direction, and the third direction are perpendicular to each other.
Preferably, the positioning column is arranged in a cylindrical shape, and the side wall of the positioning column is attached to the inner wall of the sleeve; one end of the positioning column is provided with a guide part, and the thickness of the guide part is gradually reduced from the center of the positioning column to the end part to form a guide surface.
Preferably, the riveting system further comprises: the power mechanism is arranged on one side of the first riveting head, which is far away from the second riveting head, and is used for driving the first riveting head to move towards or away from the first through hole;
the elastic mechanism is arranged on one side, away from the first riveting head, of the second riveting head, and the power mechanism drives the first riveting head to move so as to compress or release the elastic mechanism; the elastic mechanism includes: the guide post is arranged on one side, facing the second fixing plate, of the first fixing plate, a guide sleeve is arranged on one side, facing the first fixing plate, of the second fixing plate, and the guide post and the guide sleeve are connected in a sliding mode; and the spring is sleeved on the guide pillar, one end of the spring is abutted to the first fixing plate, and the other end of the spring is abutted to the guide sleeve.
Preferably, a plurality of notches are formed in the inner walls of the first through hole and the second through hole, and a plurality of protrusions are formed in the first squeeze riveting head and the second squeeze riveting head; when the first riveting head/the second riveting head moves towards the first through hole/the second through hole, the protrusion is abutted to the notch.
Preferably, the depth of the notch is gradually reduced from the first through hole/the second through hole towards the sleeve direction to form a first guide inclined plane; the thickness of the bulge is gradually reduced towards the sleeve direction from the first riveting head/the second riveting head to form a second guide inclined plane; when the first riveting head/the second riveting head move towards the first through hole/the second through hole, the first guide inclined surface is attached to the second guide inclined surface.
Preferably, a deformation part is arranged between any two adjacent notches, and the first riveting head/the second riveting head moves towards the sleeve direction to drive the deformation part to bend towards the sleeve direction.
Preferably, the first squeeze riveter and the second squeeze riveter are close to one end of the sleeve and are both provided with a guide part, the outer diameter of the guide part is gradually reduced towards the sleeve direction by the first squeeze riveter/the second squeeze riveter to form a guide inclined plane, and the minimum outer diameter of the guide part is smaller than the inner diameter of the first through hole and/or the second through hole.
Compared with the prior art, the invention has at least the following beneficial effects:
the first clamping piece and the second clamping piece move along the first direction to reduce or enlarge the distance between the first clamping part and the second clamping part so as to realize clamping and fixing or releasing the sleeve; the conveying assembly can move along the second direction to drive the clamping assembly to convey the sleeve to the riveting piece. The clamping and conveying of the sleeve do not need manual operation, and the automation degree is high; and the distance between the second clamping piece and the first clamping piece is changed through the movement of the second clamping piece, so that clamping or loosening is realized, the clamping force is moderate, and the clamping and loosening actions are convenient.
And the first clamping part is connected with the side wall of the sleeve, and the first clamping part is arranged in an arc shape, so that the contact area between the first clamping part and the sleeve can be increased, and the clamping of the first clamping part to the sleeve is more stable.
And thirdly, the elastic sheet is arranged, so that the sleeve can be protected. When the second clamping piece moves to just abut against the sleeve, the second clamping piece is difficult to stop moving instantly, the second clamping piece often continues to move for a certain distance, and if the elastic piece is not arranged, the second clamping piece is likely to continue moving so as to damage the sleeve; and if the elastic piece is arranged, the movement of the second clamping piece is just absorbed by the deformation of the second clamping piece, and the sleeve cannot be damaged.
And the elastic piece is arranged in an arc shape, so that the contact area between the second clamping piece and the sleeve can be increased, and the clamping of the second clamping piece to the sleeve is more stable.
And fifthly, the elastic piece is arranged, so that the second clamping piece can clamp the sleeve more stably. In the clamping process of the second clamping part to the sleeve, the elastic sheet gradually deforms, so that the elastic sheet is attached to the side wall of the sleeve to the maximum extent, and the elastic sheet is clamped to the sleeve more stably.
Sixthly, the positioning columns are arranged to position the sleeve, so that the position of the sleeve conveyed to the riveting piece is determined; meanwhile, the positioning column can move along the third direction, and the movement of the sleeve in the second direction cannot be influenced under the condition that the sleeve is positioned.
Seventhly, first end plate and second end plate are for riveting simultaneously, have improved the efficiency of pressure riveting, lead to the not good phenomenon of riveting effect because of the other end can't be fixed when having avoided one end riveting, improve riveting strength.
Eighthly, only one power mechanism is arranged on one side of the first end plate, one side of the second end plate is provided with an elastic mechanism, the elastic mechanism enables the second press riveting head to exit from the second through hole after riveting is completed, the press riveting heads on two ends can automatically separate by only arranging one power assembly, and power (cost) is saved compared with the setting of arranging one power mechanism on two sides.
And ninthly, notches are formed in the inner walls of the first through hole and the second through hole, so that the parts near the first through hole/the second through hole cannot be mutually extruded when the riveting generates deformation, and the effect is reduced.
Tenths are arranged at the first squeeze riveting head and the second squeeze riveting head and are abutted against the notches, the positions near the first through hole/the second through hole are divided into a plurality of deformation parts by the tenths, and when deformation occurs, the deformation parts cannot interfere with each other due to isolation of the tenths; the combination of the bulge and the notch can also play a role in guiding, so that the movement directions of the first riveting head and the second riveting head are more accurate, and the pressing riveting effect is enhanced.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Referring to fig. 1 to 12, the present invention discloses a grabbing and riveting integrated device for a sleeve, including: a gripping system 1000 and a riveting system 2000, wherein the gripping system 1000 can grip the sleeve 600 and convey the sleeve to the riveting system 2000;
the grasping system 1000 includes: a clamping assembly 200, comprising: a first clamping member 210 disposed at one side of the sleeve 600 and having a first clamping portion 213; a second clamping member 220 disposed at the other side of the sleeve 600 and having a second clamping portion 223, wherein the second clamping member 220 can move in the first direction to reduce or increase the distance between the first clamping portion 213 and the second clamping portion 223 to clamp or release the sleeve 600; the conveying assembly 300 is connected with the clamping assembly 200, and the conveying assembly 300 can drive the clamping assembly 200 to move along a second direction so as to convey the sleeve 600 into the riveting piece 100; the first direction is perpendicular to the second direction;
specifically, in the present embodiment, the second clamping member 220 moves in a first direction, i.e. toward or away from the first clamping member 210, so as to reduce or enlarge the distance between the first clamping portion 213 and the second clamping portion 223, thereby clamping and fixing or releasing the sleeve 600; the conveying assembly 300 can move in the second direction to drive the clamping assembly 200 to convey the sleeve 600 into the rivet 100.
In the process, the clamping and conveying of the sleeve 600 do not need manual operation, and the automation degree is high; and the distance between the second clamping piece 220 and the first clamping piece 210 is changed through the movement of the second clamping piece, so that the clamping or the releasing is realized, the clamping force is moderate, and the actions of clamping and releasing are convenient and fast.
The first direction and the second direction are perpendicular. When the second clamping member 220 moves in the first direction, it will not be driven to move in the second direction; when the conveying assembly 300 moves along the second direction, the clamping assembly 200 does not move in the first direction, and the movement in the two directions does not interfere with each other.
The riveting system 2000 includes: the riveting member 100 comprises a first end plate 110 and a second end plate 120 which are arranged at intervals, wherein a first through hole 111 is formed in the first end plate 110, a second through hole 121 is formed in the second end plate 120, and the first through hole 111 and the second through hole 121 are arranged oppositely; the sleeve 600 is disposed between the first end plate 110 and the second end plate 120, one end of the sleeve 600 is connected to the first end plate 110, and the other end of the sleeve 600 is connected to the second end plate 120; the radii of the first through hole 111 and the second through hole 121 are both smaller than the inner diameter of the sleeve 600; the riveting mechanism comprises a first riveting head 410 and a second riveting head 420, wherein the first riveting head 410 is positioned on one side of the first end plate 110 far away from the second end plate 120, and the second riveting head 420 is positioned on one side of the second end plate 120 far away from the first end plate 110; the outer diameters of the first squeeze rivet head 410 and the second squeeze rivet head 420 are both smaller than the inner diameter of the sleeve 600 and both larger than the inner diameters of the first through hole 111 and the second through hole 121.
In the riveting system 2000, the first end plate 110 and the second end plate 120 are riveted at the same time, so that the efficiency of pressure riveting is improved; the two ends are riveted simultaneously, so that the phenomenon of poor riveting effect caused by the fact that one end cannot be fixed when being riveted is avoided, and the riveting strength is improved;
preferably, the clamping assembly 200 further comprises: a sliding plate 250 connected to the conveying assembly 300; a first guide rail 230 disposed on the sliding plate 250 along a first direction, the first clamping member 210 being fixedly disposed on the sliding plate 250, the second clamping member 220 being connected to the first guide rail 230, and the second clamping member 220 being slidable along the first direction with respect to the guide rail; a first driving cylinder 240 for driving the second clamping member 220 to slide relative to the first guide rail 230; specifically, the second clamping member 220 slides relative to the first guide rail 230, so as to realize the movement of the second clamping along the first direction, further change the distance between the second clamping member and the first clamping member 210, and finally realize the clamping and releasing of the sleeve 600. Further, the first clamping member 210 includes a first clamping bar 211 and a first sliding bar 212 which are fixedly connected, the first clamping portion 213 is disposed on the first clamping bar 211, and the first sliding bar 212 is fixed on the sliding plate 250; the second clamping member 220 comprises a second clamping rod 221 and a second sliding rod 222 which are fixedly connected, the second clamping part 223 is arranged on the second clamping rod 221, and the second sliding rod 222 is slidably connected with the first guide rail 230; when the second clamping member 220 slides to the position where the first sliding rod 212 abuts against the second sliding rod 222, the second clamping member 220 can be restricted from sliding further, and thus the second clamping member can also function as a protective sleeve 600.
The delivery assembly 300 includes: a fixed plate 310, wherein a second guide rail 320 is arranged on the fixed plate 310, the second guide rail 320 is arranged along a second direction, and the sliding plate 250 is slidably arranged on the second guide rail 320; a second driving cylinder 330 for driving the sliding plate 250 to slide with respect to the second guide rail 320.
Specifically, the sliding plate 250 slides relative to the fixed plate 310, so that the first clamping member 210 and the second clamping member 220 on the sliding plate 250 drive the sleeve 600 to move together along the second direction, thereby conveying the sleeve 600 to the rivet 100.
Further, a first stopper 311 and a second stopper 312 are disposed on the fixed plate 310, and the first stopper 311 and the second stopper 312 are respectively disposed at front and rear ends of the sliding plate 250. When the sliding block slides to abut against the first stopper 311 or the second stopper 312, the sliding of the sliding plate 250 can be restricted, so as to avoid excessive sliding of the sliding block.
Still further, the first limiting block 311 may be used as a positioning block, and the position of the first limiting block 311 along the second direction may be adjusted. When the sliding plate 250 moves along the second direction to abut against the first limiting block 311, the sleeve 600 is just conveyed to the riveting member 100, that is, the length of the conveying stroke of the conveying assembly 300 is preset by the positioning block, so that the sleeve 600 is accurately conveyed; the length of the conveying stroke of the conveying assembly 300 can be adjusted by adjusting the position of the first limiting block 311 along the second direction, so as to adapt to different use requirements.
Preferably, the first clamping portion 213 is disposed in an arc shape, and the first clamping portion 213 is attached to a side wall of the sleeve 600; the second clamping portion 223 is provided with an elastic piece 224, the elastic piece 224 is provided in an arc shape, and the elastic piece 224 is attached to the side wall of the sleeve 600.
The first clamping portion 213 is connected to the sidewall of the sleeve 600, and the first clamping portion 213 is disposed in an arc shape, so that the contact area between the first clamping portion 213 and the sleeve 600 can be increased, and the sleeve 600 can be clamped more stably.
The elastic piece 224 is provided to protect the sleeve 600. Specifically, when the second clamping member 220 moves to just abut against the sleeve 600, it is difficult to stop the movement instantly, and the movement tends to continue for a distance, and if the elastic piece 224 is not provided, the second clamping member 220 is likely to continue to move, which may cause the sleeve 600 to be damaged; if the elastic piece 224 is provided, the movement of the second clamping member 220 is just absorbed by the deformation of the second clamping member 220, and the sleeve 600 is not damaged.
The elastic piece 224 is arranged in an arc shape, so that the contact area between the second clamping piece 220 and the sleeve 600 can be increased, and the sleeve 600 can be clamped more stably.
The elastic piece 224 is provided to further stabilize the clamping of the sleeve 600 by the second clamping member 220. Specifically, in the process of clamping the sleeve 600 by the second clamping portion 223, the elastic piece 224 is gradually deformed, and further maximally adheres to the sidewall of the sleeve 600, so that the sleeve 600 is clamped more stably.
Preferably, the grasping system 1000 further includes: a positioning assembly 500, wherein the positioning assembly 500 comprises a positioning column 510 disposed between the first clamping portion 213 and the second clamping portion 223; a driving member 520, configured to drive the positioning post 510 to move along a third direction to extend into or separate from the sleeve 600; any two of the first direction, the second direction, and the third direction are perpendicular to each other.
Specifically, since the sleeve 600 cannot be accurately positioned at the riveting position, the present embodiment provides a fixed stroke of each transportation of the transportation assembly 300, so that the position after transportation is necessarily a preset position as long as the sleeve 600 is positioned before transportation. Before conveying, the positioning column 510 is positioned between the first clamping part 213 and the second clamping part 223, and then the sleeve 600 is positioned between the first clamping part 213 and the second clamping part 223 to realize positioning; then, the second clamping portion 223 moves to clamp the sleeve 600, the rear positioning column 510 moves along the third direction to withdraw from the sleeve 600 after clamping the sleeve 600, so that the sleeve 600 can move along the second direction, and finally the sleeve 600 is conveyed to the rivet 100 under the driving of the conveying assembly 300. After riveting, the second clamping portion 223 releases the sleeve 600, the conveying assembly 300 drives the clamping assembly 200 to withdraw from the riveting member 100, and the positioning column 510 moves along the third direction to reach between the first clamping portion 213 and the second clamping portion 223 for positioning, clamping and conveying the sleeve 600 next time.
In the above process, positioning columns 510 are provided to position sleeve 600 so that the position of sleeve 600 at the position of being conveyed to rivet 100 is determined. Meanwhile, the positioning column 510 can move along the third direction, and the movement of the sleeve 600 in the second direction is not affected even when the sleeve 600 is positioned.
Preferably, the positioning column 510 is disposed in a cylindrical shape, and a side wall of the positioning column 510 is attached to an inner wall of the sleeve 600; one end of the positioning column 510 is provided with a guide portion, and the thickness of the guide portion gradually decreases from the center of the positioning column 510 to the end to form a guide surface 511.
The guide surface 511 is provided to correct the positional error of the sleeve 600 with a guiding function when the positioning post 510 is inserted into the sleeve 600, thereby achieving accurate positioning. At the same time, the guiding surface 511 also makes the insertion of the positioning post 510 into the sleeve 600 smoother.
Preferably, the riveting system 2000 further comprises: the power mechanism 430 is disposed on one side of the first squeeze riveting head 410 away from the second squeeze riveting head 420, and is configured to drive the first squeeze riveting head 410 to move towards or away from the first through hole 111;
the elastic mechanism 440 is arranged on one side of the second riveting head 420 far away from the first riveting head 410, and the power mechanism 430 drives the first riveting head 410 to move so as to compress or release the elastic mechanism 440; the elastic mechanism 440 includes: a first fixing plate 441 and a second fixing plate 442, wherein a guide pillar is disposed on a side of the first fixing plate 441 facing the second fixing plate 442, a guide sleeve is disposed on a side of the second fixing plate 442 facing the first fixing plate 441, and the guide pillar is slidably connected with the guide sleeve; and the spring is sleeved on the guide pillar, one end of the spring is abutted to the first fixing plate 441, and the other end of the spring is abutted to the guide sleeve.
Specifically, in the present embodiment, the power mechanism 430 moves from the first squeeze rivet head 410 to the second squeeze rivet head 420, first compresses the elastic mechanism 440, and when the elastic mechanism 440 cannot be compressed, rivets the first through hole 111 and one end of the sleeve 600, and rivets the second through hole 121 and the other end of the sleeve 600; after riveting, the power mechanism 430 moves from the second squeeze rivet head 420 toward the first squeeze rivet head 410, first releases the elastic mechanism 440, and the elastic mechanism 440 enables the second squeeze rivet head 420 to exit the second through hole 121, and continues to move to enable the first squeeze rivet head 410 to exit the first through hole 111, thereby completing the double-sided riveting of the first end plate 110 and the second end plate 120.
In the process, only one power mechanism 430 is arranged on one side of the first end plate 110, the elastic mechanism 440 is arranged on one side of the second end plate 120, and after riveting is completed, the elastic mechanism 440 enables the second rivet pressing head 420 to exit the second through hole 121, so that the rivet pressing heads at two ends can automatically separate by arranging only one power assembly, and compared with the setting of arranging one power mechanism 430 on two sides, power (cost) is saved.
Preferably, a plurality of notches 130 are formed in the inner walls of the first through hole 111 and the second through hole 121, and a plurality of protrusions 401 are formed in the first squeeze riveter head 410 and the second squeeze riveter head 420; when the first squeeze head 410/the second squeeze head 420 move toward the first through hole 111/the second through hole 121, the protrusion 401 abuts against the notch 130.
Notches 130 are formed in the inner walls of the first through hole 111 and the second through hole 121, so that the parts near the first through hole 111/the second through hole 121 cannot be mutually extruded to reduce the effect when the riveting deformation is generated; meanwhile, the first squeeze rivet head 410 and the second squeeze rivet head 420 are both provided with the protrusions 401, the protrusions 401 are abutted against the notches 130, the protrusions 401 divide the positions near the first through hole 111/the second through hole 121 into a plurality of deformation parts 131, and when deformation occurs, the deformation parts 131 cannot interfere with each other due to the isolation of the protrusions 401; the combination of the protrusion 401 and the notch 130 can also play a role of guiding, so that the moving directions of the first rivet head and the second rivet head are more accurate, and the riveting effect is enhanced.
Preferably, the depth of the notch 130 is gradually reduced from the first through hole 111/the second through hole 121 towards the sleeve 600 to form a first guiding inclined surface 132; the thickness of the protrusion 401 is gradually reduced from the first squeeze head 410/the second squeeze head 420 toward the sleeve 600 to form a second guiding inclined plane 402; when the first squeeze head 410/the second squeeze head 420 move toward the first through hole 111/the second through hole 121, the first guide slope 132 abuts the second guide slope 402.
The first guide inclined surface 132 and the second guide inclined surface 402 are arranged to have the inclined directions, so that the force between the first guide inclined surface 132 and the second guide inclined surface 402 is gradually increased, deformation is favorably generated, riveting is further realized, the rivet pressing effect can be improved, meanwhile, the guide function is also realized, the direction error of the first rivet pressing head 410/the second rivet pressing head 420 is corrected, and the rivet pressing effect is improved.
Furthermore, the inner walls of the first through hole 111 and the second through hole 121 are respectively and uniformly provided with four notches 130 along the circumferential direction thereof, the first squeeze riveter head 410 and the second squeeze riveter head 420 are respectively and uniformly provided with four protrusions 401 along the circumferential direction thereof, and the four notches 130 and the four protrusions 401 are in one-to-one correspondence.
The notches 130 are uniformly arranged, so that the sizes of the deformation parts 131 are consistent, the deformation quantity is consistent, and the effect that the riveting strength of each part is the same is finally achieved.
Preferably, a deformation portion 131 is disposed between any two adjacent notches 130, and the movement of the first squeeze riveting head 410/the second squeeze riveting head 420 toward the sleeve 600 can drive the deformation portion 131 to bend toward the sleeve 600.
Specifically, the portion of the first end plate 110/the second end plate 120 between two adjacent notches 130 is deformed (i.e., the deformation portion 131), and the deformation portion 131 is bent (or has other various forms of deformation, where bending is understood as a generalized deformation) along with the movement of the first riveting head 410/the second riveting head 420, so that the deformation portion 131 is integrally coupled with the sleeve 600 to realize riveting.
Preferably, the first squeeze head 410 and the second squeeze head 420 have a guide portion at one end close to the sleeve 600, the outer diameter of the guide portion gradually decreases from the first squeeze head 410/the second squeeze head 420 toward the sleeve 600 to form a guide slope 421, and the minimum outer diameter of the guide portion is smaller than the inner diameter of the first through hole 111 and/or the second through hole 121.
The arrangement of the guide inclined plane 421 can also correct the movement direction error of the first squeeze rivet head 410/the second squeeze rivet head 420, so that the first squeeze rivet head and the second squeeze rivet head move towards the axial direction of the sleeve 600, the stress of each deformation part 131 is consistent, and the squeeze rivet effect is improved.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Moreover, descriptions of the present invention as relating to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.