阅读说明：本技术 一种婴儿摇床 (Baby cradle ) 是由 单华锋 周陈华 季川祥 王剑 代加齐 黄蒙 任宇翔 于 2020-04-30 设计创作，主要内容包括：本发明提供了一种婴儿摇床,婴儿摇床包括：床厢、至少两个摆动杆和U形底座；其中,所述床厢通过所述摆动杆悬挂于所述底座中,所述床厢可沿所述底座的U形空间延展方向摇摆；所述床厢包括：床板、推杆电机、电机横杆和两端开口的围栏；所述电机横杆设于所述围栏的底部,所述电机横杆的延伸方向与所述底座的U形空间延展方向一致；所述床板的头部底面与所述推杆电机的一端枢轴连接,所述床板的脚部边沿与所述围栏枢轴连接；所述推杆电机的另一端与所述电机横杆枢轴连接。本发明的婴儿摇床,通过倾斜床板将婴儿变成斜躺,吐奶就会减少,再配合摆动,防溢奶的同时还帮助婴儿快速入睡,看护人省心省力。(The invention provides a cradle, comprising: the bed comprises a bed compartment, at least two swinging rods and a U-shaped base; wherein the bed is suspended in the base through the swinging rod, and the bed can swing along the extension direction of the U-shaped space of the base; the bed includes: the bed board, the push rod motor, the motor cross bar and the fence with openings at two ends; the motor cross bar is arranged at the bottom of the fence, and the extension direction of the motor cross bar is consistent with the extension direction of the U-shaped space of the base; the bottom surface of the head of the bed board is connected with one end of the push rod motor through a pivot, and the edge of the foot of the bed board is connected with the rail through a pivot; the other end of the push rod motor is connected with the motor cross rod through a pivot. According to the baby cradle, the baby is changed into the inclined lying state by inclining the bed plate, milk spitting is reduced, and the baby cradle swings in a matched manner, so that the baby can fall asleep quickly while preventing milk overflow, and caregivers are relieved and labor-saving.)

1. A cradle, comprising: the bed comprises a bed compartment, at least two swinging rods and a U-shaped base;

wherein the bed is suspended in the base through the swinging rod, and the bed can swing along the extension direction of the U-shaped space of the base;

the bed includes: the bed board, the push rod motor, the motor cross bar and the fence with openings at two ends;

the motor cross bar is arranged at the bottom of the fence, and the extension direction of the motor cross bar is consistent with the extension direction of the U-shaped space of the base;

the bottom surface of the head of the bed board is connected with one end of the push rod motor through a pivot, and the edge of the foot of the bed board is connected with the rail through a pivot;

the other end of the push rod motor is connected with the motor cross rod through a pivot.

2. The cradle of claim 1, further comprising: the bottom surface of the motor cross rod is provided with a first fixing rod and a second fixing rod;

the winding barrel can be arranged on the top surface of the base in a reciprocating and rotating mode and is located between the first fixing rod and the second fixing rod;

one end of each of the first wire body and the second wire body is wound on the winding barrel, the winding direction of the first wire body is opposite to that of the second wire body, and the other end of each of the first wire body and the second wire body is connected with the first fixing rod and the second fixing rod respectively.

3. The cradle of claim 2, wherein said spooling barrel comprises: a first V-shaped port and a second V-shaped port;

wherein the first V-shaped port and the second V-shaped port are both annular;

the opening directions of the first V-shaped opening and the second V-shaped opening are consistent with the rotating direction of the winding barrel, the first line body is wound on the first V-shaped opening, and the second line body is wound on the second V-shaped opening.

4. The cradle of claim 3 wherein the angle between the V-shape of said first V-shaped opening and said second V-shaped opening is from 30 ° to 120 °.

5. The cradle of claim 2 wherein said bobbin is motor driven.

6. The cradle of claim 1, wherein said enclosure comprises: the side plate comprises a carriage body and a turnable side plate, wherein the bottom of the side plate is hinged with the carriage body, and the side part of the side plate is detachably connected with the carriage body.

7. The cradle of claim 6, wherein the side portion of the side plate is detachably connected to the compartment by a pin, and the side plate has a pin and a plurality of through holes at both sides thereof, the pin is disposed in the through holes, and the pin is inserted into a pin slot disposed in the compartment through an edge of the side plate along the extension direction of the side plate.

8. The cradle of claim 6, wherein the side of the side plate is detachably connected to the compartment by a latch, the latch being disposed at an edge of the side plate;

wherein, the bolt includes: the compartment body is provided with a bolt hole for accommodating part of the bolt core.

9. The cradle of any one of claims 1-8, wherein the swinging arm comprises: the swing rod, the bearing, the first rotating shaft and the second rotating shaft;

wherein, two ends of the swing rod are respectively provided with the bearing;

the first rotating shaft is arranged on the inner wall of the base, the second rotating shaft is arranged on the outer wall of the bed chamber opposite to the first rotating shaft, and the bearings rotate by the first rotating shaft and the second rotating shaft respectively;

the horizontal height of the first rotating shaft is greater than that of the second rotating shaft.

10. The cradle according to any one of claims 2-8, wherein the first wire and the second wire are connected to the first and second stationary bars, respectively, by elastic members.

11. The cradle of claim 9, further comprising: the supporting connecting piece is arranged at the connecting corner of the base, and the roller is fixedly connected with the supporting connecting piece.

Technical Field

The invention relates to the field of shaking tables, in particular to a baby shaking table.

Background

With the improvement of living standard, the crib is gradually popularized, but the function is single, and the increasing new requirements cannot be met. After the baby eats milk, the baby can fall asleep easily, and the swing can help the baby to fall asleep, but when the baby lies on a bed, milk can flow out from the corners of the mouth, even milk which is eaten right after the baby is spitted out completely, and the situation is aggravated by the swing.

Disclosure of Invention

The invention provides a baby cradle, which aims to solve the problem of milk spilling when a baby lies down.

To achieve the above objects, the present invention provides a cradle comprising: the bed comprises a bed compartment, at least two swinging rods and a U-shaped base; wherein the bed is suspended in the base through the swinging rod, and the bed can swing along the extension direction of the U-shaped space of the base; the bed includes: the bed board, the push rod motor, the motor cross bar and the fence with openings at two ends; the motor cross bar is arranged at the bottom of the fence, and the extension direction of the motor cross bar is consistent with the extension direction of the U-shaped space of the base; the bottom surface of the head of the bed board is connected with one end of the push rod motor through a pivot, and the edge of the foot of the bed board is connected with the rail through a pivot; the other end of the push rod motor is connected with the motor cross rod through a pivot.

Further, still include: the bottom surface of the motor cross rod is provided with a first fixing rod and a second fixing rod; the winding barrel can be arranged on the top surface of the base in a reciprocating and rotating mode and is located between the first fixing rod and the second fixing rod; one end of each of the first wire body and the second wire body is wound on the winding barrel, the winding direction of the first wire body is opposite to that of the second wire body, and the other end of each of the first wire body and the second wire body is connected with the first fixing rod and the second fixing rod respectively.

Further, the winding barrel comprises: a first V-shaped port and a second V-shaped port; wherein the first V-shaped port and the second V-shaped port are both annular; the opening directions of the first V-shaped opening and the second V-shaped opening are consistent with the rotating direction of the winding barrel, the first line body is wound on the first V-shaped opening, and the second line body is wound on the second V-shaped opening.

Further, the V-shaped included angle between the first V-shaped port and the second V-shaped port is 30 ° to 120 °.

Further, the winding drum is driven by a motor.

Further, the enclosure includes: the side plate comprises a carriage body and a turnable side plate, wherein the bottom of the side plate is hinged with the carriage body, and the side part of the side plate is detachably connected with the carriage body.

Furthermore, the side part of the side plate is detachably connected with the compartment body through a bolt, a bolt and a plurality of through holes are arranged on two sides of the side plate, the bolt is arranged in the through holes, and the bolt penetrates through the edge of the side plate along the extension direction of the side plate and is inserted into a pin slot arranged in the compartment body.

Furthermore, the side part of the side plate is detachably connected with the carriage body through a bolt, and the bolt is arranged on the edge of the side part of the side plate; wherein, the bolt includes: the elevator car comprises a bolt seat and a bolt core, wherein the bolt seat is provided with a slideway penetrating through the bolt seat, the bolt core is slidably arranged in the slideway, and the car body is provided with a bolt hole for accommodating part of the bolt core

Further, the swing lever includes: the swing rod, the bearing, the first rotating shaft and the second rotating shaft; wherein, two ends of the swing rod are respectively provided with the bearing; the first rotating shaft is arranged on the inner wall of the base, the second rotating shaft is arranged on the outer wall of the bed chamber opposite to the first rotating shaft, and the bearings rotate by the first rotating shaft and the second rotating shaft respectively; the horizontal height of the first rotating shaft is greater than that of the second rotating shaft.

Further, the first line body and the second line body are respectively connected with the first fixing rod and the second fixing rod through elastic pieces.

Further, still include: the supporting connecting piece is arranged at the connecting corner of the base, and the roller is fixedly connected with the supporting connecting piece.

The baby is changed into the inclined lying state by the inclined bed plate, the milk spitting is reduced, the swing is matched, the baby is helped to fall asleep quickly while the milk is prevented from overflowing, and caregivers are relieved and labor is saved. In addition, the following technical effects are included: (1) the electric motor is not influenced by an electromagnetic field, and the injury is reduced through the elastic piece 46 in flexible connection, so that the motor 45 is protected, and the safety of a user is protected. Even if an object is clamped in the operation process, the object can be easily taken out when the motor stops operating or rotates reversely, and the object cannot be clamped like other structures; (2) the motor driving is more convenient and faster than the hand-cranking driving; (3) simple structure and adjustable swing amplitude.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a front view of a cradle according to an embodiment of the present invention;

FIG. 2 is a schematic view of an internal structure of a cradle according to an embodiment of the present invention;

FIG. 3 is a perspective view of a cradle according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a cradle according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a winding drum according to an embodiment of the present invention;

FIG. 6 is an enlarged view of a portion of the winding barrel according to the embodiment of the present invention;

FIG. 7 is an enlarged view of part A in the embodiment of the present invention;

FIG. 8 is an enlarged view of part B of the present embodiment;

FIG. 9 is a schematic view of another embodiment of the latch of the present invention;

FIG. 10 is an exploded view of another embodiment of a latch according to the present invention;

FIG. 11 is an exploded view of a sway bar in an embodiment of the present invention;

FIG. 12 is a bottom view of a cradle according to an embodiment of the present invention.

Description of reference numerals:

1-bed compartment, 2-swinging rod, 3-base, 4-winding barrel, 5-hinge joint;

11-bed plate, 12-push rod motor, 13-motor cross bar, 14-rail, 21-swing rod, 22-bearing, 23-first rotating shaft, 24-second rotating shaft, 31-supporting connecting piece, 32-roller, 41-first line body, 42-second line body, 43-first V-shaped opening, 44-second V-shaped opening, 45-motor and 46-elastic piece;

131-a first fixed rod, 132-a second fixed rod, 141-a carriage body and 142-a side plate;

1431-pin top, 1432-first rod portion, 1433-second rod portion, 1434-pin seat, 1435-pin core, 1436-spring, 1437-receiving slot.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

Fig. 1 is a front view of a cradle according to an embodiment of the present invention, fig. 2 is a schematic view of an internal structure of a cradle according to an embodiment of the present invention, and fig. 3 is a perspective view of a cradle according to an embodiment of the present invention, as shown in fig. 1 to 3, the present invention provides a cradle including: a bed box 1, at least two swing rods 2 and a U-shaped base 3; wherein the bed carriage 1 is suspended in the base 3 through the swing rod 2, and the bed carriage 1 can swing along the extension direction of the U-shaped space of the base 3; the bed 1 includes: a bed plate 11, a push rod motor 12, a motor cross bar 13 and a fence 14 with two open ends; the motor cross bar 13 is arranged at the bottom of the fence 14, and the extending direction of the motor cross bar 13 is consistent with the extending direction of the U-shaped space of the base 3; the bottom surface of the head of the bed plate 11 is pivotally connected with one end of the push rod motor 12, and the edge of the foot of the bed plate 11 is pivotally connected with the fence 14; the other end of the push rod motor 12 is pivotally connected with the motor cross bar 13.

The bed box 1 is suspended on the base 3 through the swing rod 2 and does not interfere with the base 3, the preferable number of the swing rod 2 is four, two components are arranged at the adjacent position of the bed box 1 and the base 3, and the bed box 1 can be pushed by people or machinery to swing by taking the base 3 as a fulcrum. The motor cross rod 13 is arranged at the bottom of the base 3 and used for supporting the straight-bar motor and indirectly supporting the bed board 11, the motor cross rod 13 is preferably arranged below the head of the bed board 11, and the straight-bar motor pushes the bed board 11 to lift or descend by taking the pivot connection between the bed board 11 and the fence 14 as a rotating shaft, so that the bed board 11 is turned over. After feeding, the baby is put on the bed after being held for a period of time, and the milk spitting is obviously reduced. It can be seen that, with the baby put this cradle, straight-bar motor drive bed board 11 lifting, bed board 11 slope is put the baby like this and has just become the recumbent on the bed, and it will reduce to tell milk, and the angle of bed board 11 upset is big more, is close the effect of embracing anyhow more, and anti-overflow milk effect is just also better, and the swing of bed railway carriage or compartment 1 is deuterogamied, still helps the baby to fall asleep fast in the time of preventing overflowing milk, liberates parents, saves worry laborsaving.

The overturning angle of the bed plate 11 is 0-30 degrees, if the angle is too large, the larger the gap between the bed plate 1 and the guardrail 6 is, and the condition that a baby is injured by clamping easily occurs; preferably 0-10 degrees, and can ensure the safety of the baby.

The fence 14 encloses the bed board 11, the push rod motor 12 and the motor cross rod 13 inside, the height of the fence is set according to the body type of the baby, but the height of the inner part measured from the plane of the bed board 11 at the highest position to the lowest position of the fence 14 is 275 mm at least, so that the baby is prevented from falling off, and the safety of the baby is ensured. Preferably, a plurality of hollow holes can be additionally arranged on the bed plate 1 for ventilation and can also reduce the whole weight. Further, fig. 4 is a cross-sectional view of a cradle according to an embodiment of the present invention, fig. 5 is a schematic structural view of a winding barrel according to an embodiment of the present invention, and as shown in fig. 4 and 5, the cradle further includes: the winding device comprises a winding barrel 4, a first wire body 41 and a second wire body 42, wherein a first fixing rod 131 and a second fixing rod 132 are arranged on the bottom surface of a motor cross rod 13; wherein, the winding barrel 4 can be reciprocally and rotatably arranged on the top surface of the base 3 and is positioned between the first fixing rod 131 and the second fixing rod 132; one end of the first wire body 41 and one end of the second wire body 42 are respectively wound on the winding drum 4, the winding direction of the first wire body 41 is opposite to that of the second wire body 42, and the other end of the first wire body 41 and the other end of the second wire body 42 are respectively connected with the first fixing rod 131 and the second fixing rod 132.

The axis of the winding barrel 4 is perpendicular to the motor cross bar 13, and when the winding barrel 4 rotates, the first line body 41 and the second line body 42 can drive the bed box 1 to horizontally swing back and forth according to the rotation degree of the winding barrel 4. In addition, the swing of the horizontal reciprocating motion may be adjusted according to the length of the first and second wire bodies 41 and 42 wound on the winding tub 4, i.e., the number of windings.

Further, fig. 6 is an enlarged view of a part of the winding drum according to the embodiment of the present invention, and as shown in fig. 6, the winding drum 4 includes: a first V-shaped port 43 and a second V-shaped port 44; wherein the first V-shaped port 43 and the second V-shaped port 44 are both annular; the opening directions of the first V-shaped opening 43 and the second V-shaped opening 44 are the same as the rotation direction of the winding barrel 4, the first wire 41 is wound around the first V-shaped opening 43, and the second wire 42 is wound around the second V-shaped opening 44. The first line body 41 and the second line body 42 are separately wound through the first V-shaped port 43 and the second V-shaped port 44, so that mutual interference is avoided, and the continuity and the stability of swinging are ensured.

The winding barrel 4 is provided with round holes through the first V-shaped opening 43 and the second V-shaped opening 44, the first V-shaped opening 43 and the second V-shaped opening 44 are internally provided with round holes, one ends of the first line body 41 and the second line body 42 are fixed in the round holes, and the first line body 41 and the second line body 42 can be tightly wound in the first V-shaped opening 43 and the second V-shaped opening 44 respectively to prevent falling off.

Further, because the bed compartment 1 has a height difference when horizontally swinging back and forth, the V-shaped included angle between the first V-shaped opening 43 and the second V-shaped opening 44 is 30 ° to 120 ° to compensate the height difference and prevent the wire from being separated during the rotation of the winding barrel 4.

Further, as shown in fig. 5, the winding barrel 4 is driven by a motor 45, and the motor 45 is set to rotate in forward and reverse directions to drive the winding barrel to rotate 4 back and forth, so that the swing of the cradle is automated. The motor 45 can also be driven by a remote control device to realize remote control. The automatic swing does not need physical expenditure, and the baby can be pacified by swinging uninterruptedly.

Further, fig. 7 is an enlarged view of a portion a in the embodiment of the present invention, and as shown in fig. 3 and 7, the fence 14 includes: the foldable side plate comprises a carriage body 141 and a turnable side plate 142, wherein the bottom of the side plate 142 is hinged 5 with the carriage body 141, and the side part of the side plate 142 is detachably connected with the carriage body 141.

The side of the enclosure 14 is changed to a reversible side panel 142, and the side panel 142 can be turned down by a hinge to facilitate the movement of the baby by the user. The hinge is disposed inside the side plate 142 and the compartment 141, so that when the side plate 142 returns to form a complete peripheral surface with the compartment 141, the hinge can be hidden in the corresponding inner space of the side plate 142 and the compartment 141, and the hidden hinge is more attractive.

Further, fig. 8 is an enlarged view of a portion B in an embodiment of the present invention, as shown in fig. 8, a side portion of the side plate 142 is detachably connected to the compartment 141 through a bolt 143, the side portion of the side plate 142 is provided with a bolt 143 and a through hole 144, the bolt 143 is disposed in the through hole 144, and the bolt 143 penetrates through an edge of the side plate 142 along an extending direction of the side plate 142 and is inserted into a bolt slot disposed in the compartment 141.

The side plate 142 is provided with a bolt 143, the bolt 143 is disposed in the through hole 144, and the bolt 143 includes: a pin top 1431, a first lever portion 1432, and a second lever portion 1433, and the latch 143 passes through a portion of the side plate 142 in a direction parallel to the side plate 142, exposing the second lever portion 1433. A pin groove is provided in the carriage 141 at a position corresponding to the second rod portion 1433, and the second rod portion 1433 is inserted into the pin groove to fix the side plate 142 to the bed 1. The diameter of the first rod portion 1432 is narrower than the pin top 1431 and the second rod portion 1433, the first rod portion 1432 is sleeved with a spring, the spring can only move in a through hole 144 formed by the pin 143 through the side plate 142, when the pin top 1431 is pulled, the spring is compressed, the second rod portion 1433 leaves the pin slot, the side plate 142 is turned down through the hinge, and when the pin top 1431 is released, the pin 143 is reset through the spring. Convenient and practical, avoids stabbing the baby, and the security is better.

Further, another bolt can be used for detachable connection, fig. 9 is a schematic view illustrating installation of another bolt in an embodiment of the present invention, fig. 10 is an exploded view illustrating another bolt in an embodiment of the present invention, as shown in fig. 9 and 10, a side portion of the side plate 142 is detachably connected to the compartment body 141 through the bolt 143, and the bolt 143 is disposed at a side edge of the side plate 142; wherein the latch 143 comprises: a bolt seat 1434 provided with a slide way penetrating through itself, and a bolt core 1435 slidably provided in the slide way, and the compartment body 141 is provided with a bolt hole receiving part of the bolt core 1435.

For example, the side plate 142 may be provided with a groove at the edge thereof for receiving the latch 143, and the latch 143 preferably does not protrude beyond the surface of the side plate 142 to prevent scratching of a user and to enhance the appearance of the baby, so that the side plate 142 can be easily removed at any time and the baby can be conveniently cared for.

A spring 1436 can be additionally arranged, mutually matched accommodating grooves 1437 are formed in the mutually facing side walls of the plug pin seat 1434 and the plug pin core 1435, the spring 1436 is arranged in the mutually matched accommodating grooves 1437, and the length of the accommodating groove 1437 is larger than that of the spring 1436. The bolt core 1435 is pushed to enter the bolt hole, so that the side plate 142 is detachably connected with the carriage body 141, and the method is simple and rapid; add spring 1436 and then can cushion, play the cushioning effect when bolt core 1435 extrusion spring 1436, prevent that the bolt from reaching the extreme position sound of colliding and disturbing the baby. The spring is added to buffer, so that the bolt core 1435 plays a role in buffering when extruding the spring 1436, and the bolt 143 is prevented from reaching the limit position and being collided to disturb the baby.

Further, fig. 11 is an exploded view of the swing lever according to the embodiment of the present invention, and as shown in fig. 11, the swing lever 2 includes: the swing rod 21, the bearing 22, the first rotating shaft 23 and the second rotating shaft 24; wherein, two ends of the swing link 21 are respectively provided with the bearing 22; the first rotating shaft 23 is arranged on the inner wall of the base 3, the second rotating shaft 24 is arranged on the outer wall of the bed chamber 1 opposite to the first rotating shaft 23, and the bearings 22 respectively rotate by the first rotating shaft 23 and the second rotating shaft 24; the horizontal height of the first rotating shaft 23 is greater than the horizontal height of the second rotating shaft 24.

The swing rod 21 is made of metal, two ends of the swing rod 21 are respectively and fixedly provided with a bearing 22, the first rotating shaft 23 and the second rotating shaft 24 respectively penetrate through the bearings 22 and are respectively connected with the base 3 and the bed compartment 1, the first rotating shaft 23 and the second rotating shaft 24 are parallel, and the swing rod 21 swings by taking the first rotating shaft 23 and the second rotating shaft 24 as shafts and is matched with the bed compartment 1 to swing. The structure has the advantages of fixed swing direction, good stability, long service life of the bearing and low noise.

Further, as shown in fig. 4, the first wire body 41 and the second wire body 42 are connected to the first fixing rod 131 and the second fixing rod 132 through elastic members 46, respectively.

The elastic member 46 is preferably a spring, even if the motor 45 clamps an object during the swinging of the bed box 1, the motor 45 will not be locked, and the elastic member 46 can still be pulled to rotate, after the motor 45 rotates to the preset rotation limit, and the rotation can be reversed, so that the clamped object can be separated, but the motor 45 can not reach the preset rotation limit all the time, and the motor 45 is locked. Through the winding number of turns of adjustment first line body 41 and second line body 42 on winding bucket 4, still adjustable elastic component 46's elasticity reduces the injury when striking or pressing from both sides the object, still can play the cushioning effect, and the direction transform process of swaying that elastic component 46 is gentler, avoids swaying to extremely spacing reverse movement too stiff and frightening the baby, improves user experience.

Further, fig. 12 is a bottom view of the cradle according to the embodiment of the present invention, as shown in fig. 12, the base 3 further includes: the supporting and connecting device comprises a supporting and connecting piece 31 and a roller 32, wherein the supporting and connecting piece 31 is arranged at the connecting corner of the base 3, and the roller 32 is fixedly connected with the supporting and connecting piece 31.

The bottom of the base 3 is provided with a support connector 31, which is specifically disposed at the connecting corner of the bottom surface of the base 3 of the cradle for reinforcing the base 3, and the support connector 31 may have any shape, which is not limited herein. Four support connectors 31 connect respectively in the corner of being connected between the side of base 3, and gyro wheel 32 corresponds the setting with the quantity of support connectors 31 to connect gyro wheel 32 on support connectors 31, so can move the strong point of cradle to support connectors 31 on, increased cradle's bearing nature, the structure is safer, and makes things convenient for the removal of crib.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.