New energy automobile rifle and new energy automobile charge with safety protection function
Technical Field
The invention relates to the technical field of new energy, in particular to a new energy automobile charging gun with a safety protection function and a new energy automobile.
Background
Vehicles are indispensable tools for production and life of modern society, and with years of continuous exploitation of global traditional energy sources such as petroleum, diesel and the like, the traditional energy sources face the risk of exhaustion. The new energy greatly relieves the current situation, and is the direction of global energy development at present and in the future. At the present stage of the country, development of the new energy automobile industry is greatly supported, and the charging pile is necessary equipment for realizing the endurance of the new energy automobile.
The charging gun for the existing new energy automobile is provided with a manual switch and used for switching on a charging loop through a manual mode after the charging gun is plugged into a charging socket of the new energy automobile. The manual switch is generally a push switch or a hand push switch, and is opened by the action of a thumb when in use. However, such a manual switch has a risk of leakage, for example, at the moment of manually turning on or off the manual switch, since the circuit voltage changes greatly, it is easy to cause electric shock to the user of the charging gun, thereby causing a safety accident.
Therefore, the emergence of a charging gun capable of having a safety protection function is urgently awaited to solve this problem.
Disclosure of Invention
In view of the above, the present invention provides a new energy vehicle charging gun with excellent safety protection performance and a new energy vehicle, so as to solve the problems in the prior art.
According to a first aspect of the present invention, there is provided a new energy vehicle charging gun having a safety protection function, including:
a barrel;
the charging plug is slidably arranged in the first end of the gun barrel, two clamping protrusions are oppositely arranged on the outer peripheral wall of the charging plug, and a charging starting switch is arranged on at least one of the clamping protrusions;
the number of the pressing handles is two, the two pressing handles are symmetrically arranged on two opposite sides of the outer peripheral wall of the gun barrel, and the first end of each pressing handle is rotatably connected to the outer peripheral wall of the gun barrel;
the driving rod mechanism comprises two symmetrically arranged driving rod groups, each driving rod group is arranged corresponding to one pressing handle, one end of each driving rod group is connected with the charging plug, the other end of each driving rod group is connected with the corresponding pressing handle, and the pressing handle acts to drive the driving rod mechanism to drive the charging plug to extend out of the gun barrel or retract into the gun barrel;
the pull-back spring is arranged in the gun barrel, the first end of the pull-back spring is connected to the charging plug, and the second end of the pull-back spring is connected to the gun barrel;
the plugging mechanism comprises a first plugging mechanism and a second plugging mechanism, the first plugging mechanism and the second plugging mechanism are symmetrically arranged at the first end of the gun barrel, the first end head of the gun barrel is provided with a column barrel,
the number of the column barrels is two, the column barrels are respectively and symmetrically arranged on the peripheral wall of the gun barrel, each column barrel is arranged perpendicular to the axis of the gun barrel, an end cover is screwed on each column barrel,
the first plugging mechanism and the second plugging mechanism respectively comprise a plugging rod and a reset spring, the plugging rod is slidably arranged in the column casing, the first end of the plugging rod faces the charging plug, the reset spring is sleeved on the plugging rod, a flange part is arranged on the plugging rod and is positioned in the column casing, the first end of the reset spring is extruded on the bottom wall of the column casing, the second end of the reset spring is extruded on the flange part of the plugging rod, and the second end of the plugging rod penetrates through and exposes out of the end cover;
and clamping jaws are arranged at the second end of each pressing handle and used for being clamped on the corresponding column barrel.
Preferably, the clamping jaw comprises two elastic pieces symmetrically arranged at the second end of the pressing handle, preferably, a protruding part is arranged on the inner wall of each elastic piece, a clamping groove is arranged on the protruding part,
the column casing is of a columnar structure with a rectangular cross section, two clamping columns are arranged on two opposite side walls of the column casing and are matched with the clamping grooves for clamping the clamping grooves, and when the pressing handle presses down, the clamping grooves are clamped on the clamping columns, so that clamping of the clamping jaws and the column casing is achieved.
Preferably, the plug rod comprises a cylindrical portion, a flange portion and a locking portion which are sequentially connected from the second end to the first end of the plug rod, the reset spring is sleeved on the cylindrical portion, the locking portion is prismatic, a first inclined surface portion is arranged on the prismatic, and the first inclined surface portion faces the second end of the gun barrel.
Preferably, the card is protruding to be prismatic, is equipped with second inclined plane portion on this prism, second inclined plane portion orientation deviates from the direction setting of the second end of a gun section of thick bamboo, this card protruding with locking portion cooperation is used, be used for with charging plug locking.
Preferably, the charging start switch is disposed on a surface of the clamping projection opposite to the second inclined surface portion.
Preferably, the pressing handle comprises an anti-drop part, a holding part and a pressing part which are connected in sequence, the anti-drop part, the holding part and the pressing part are connected in sequence from a first end to a second end of the pressing handle,
the anti-disengaging portion faces away from the gun barrel and is tilted in the direction, the pressing portion is L-shaped, the end head of the pressing portion faces the gun barrel and is bent in the direction, and the end face of the pressing portion is used for extruding the end head of the second end of the plug-pull rod.
Preferably, be equipped with two stoppers on the gun barrel, two the stopper symmetry is located on the periphery wall of gun barrel, the stopper be used for right the range of pushing down of pressing the handle carries on spacingly.
Preferably, the charging plug comprises a plug body and a sliding column, the plug body and the sliding column are coaxially arranged and connected, a charging cable penetrates into the gun barrel from the second end of the gun barrel and penetrates through the pull-back spring to be fixed on the plug body through the sliding column,
the charging cable is connected with a plurality of charging electrodes of the plug body.
The new energy automobile charging gun with the safety protection function has excellent safety protection performance. In the charging process, the plug-in and the pull-out of the charging plug are realized only by operating the handle without directly contacting with the charging starting switch, so that electric shock accidents caused by electric leakage and the like are avoided; and, at first peg graft the charging plug on new energy automobile's charging socket when pegging graft charging plug, then open again and open the start switch that charges through pushing down the handle, when extracting charging plug, at first close the start switch that charges through pressing the first end of handle, extract charging plug again, so, make the disconnection voltage current that charges of rifle steady, further avoided the appearance of incident.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1-2 show a perspective view of a charging gun with a safety protection function for a new energy vehicle in a non-use state according to an embodiment of the present invention from different perspectives.
Fig. 3 shows a cross-sectional view of a new energy vehicle charging gun with a safety protection function according to an embodiment of the invention in a non-use state.
Fig. 4 is an enlarged view of a portion a in fig. 3.
Fig. 5 shows a cross-sectional view of the new energy vehicle charging gun with the safety protection function according to the embodiment of the invention in a state that the new energy vehicle charging gun is plugged into a charging socket of a new energy vehicle but is not yet charged (at this time, the charging plug is pushed forward until the clamping protrusion of the charging plug exceeds the plugging rod, but the clamping jaw is not yet clamped on the column barrel, so that the plugging rod is pressed into the through cavity).
Fig. 6 shows an enlarged view of a portion B in fig. 5.
Fig. 7 shows a cross-sectional view of a new energy vehicle charging gun with a safety protection function in a charging state (when a charging start switch is turned on, a charging loop is turned on) according to an embodiment of the invention.
Fig. 8 shows an enlarged view of the portion C in fig. 7.
Fig. 9 to 10 are schematic perspective views of gun barrels of the new energy vehicle charging gun with safety protection function according to the embodiment of the invention from different perspectives.
Fig. 11 shows an enlarged view of a portion D in fig. 10.
Fig. 12 is a sectional view of a gun barrel of a new energy vehicle charging gun with a safety protection function according to an embodiment of the present invention.
Fig. 13 to 14 are schematic diagrams illustrating connection structures of a charging plug and a charging cable of the charging pile of the new energy vehicle from different perspectives according to the embodiment of the invention.
Fig. 15 to 16 are schematic perspective views illustrating a pressing handle of a new energy vehicle charging gun with a safety protection function according to an embodiment of the invention.
Fig. 17 shows an enlarged view of a portion E in fig. 16.
Fig. 18 to 19 are schematic perspective views of end caps of a new energy vehicle charging gun with a safety protection function according to an embodiment of the invention.
Fig. 20 to 21 are schematic perspective views illustrating a first driving rod of a charging gun for a new energy vehicle with a safety protection function according to an embodiment of the present invention.
Fig. 22 is a schematic perspective view illustrating a second driving rod of a charging gun for a new energy vehicle with a safety protection function according to an embodiment of the invention.
Fig. 23 is a schematic perspective view illustrating a plug rod of a charging gun of a new energy vehicle with a safety protection function according to an embodiment of the invention.
Fig. 24 to 25 are schematic perspective views of elastic protection valves of a new energy vehicle charging gun with safety protection function according to an embodiment of the invention from different perspectives.
Fig. 26 shows a front view (laminated structure) of an elastic protection valve of the new energy vehicle charging gun with safety protection function according to the embodiment of the invention.
In the figure: the charging device comprises a gun barrel 1, a clamping screw 12, a barrel 13, a clamping column 131, an end cover 14, a limiting block 15, a rear cover 16, a sliding cavity 17, an outward extending groove 18, a charging plug 2, a plug body 21, a clamping protrusion 211, a charging starting switch 2111, a sliding column 22, a clamping pin 221, a pressing handle 3, an anti-falling part 31, a holding part 32, a pressing part 33, a clamping jaw 331, a clamping groove 3311, a first driving rod 41, a sliding groove 411, a sliding shaft 412, a second driving rod 42, a pull-back spring 5, an elastic protection valve 6, a charging cable 7, a first plugging mechanism 81, a second plugging mechanism 82, a plugging rod 802, a cylindrical part 8022, a flange part 8023, a locking part 8024, a return spring 803 and a sealing ring 9.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
As shown in fig. 1 to 26, the present invention provides a new energy vehicle charging gun with a safety protection function, which includes a gun barrel 1, a charging plug 2, a pressing handle 3, a driving rod mechanism, a pull-back spring 5, and a plugging mechanism. The charging plug 2 is slidably arranged in the first end of the gun barrel 1, two clamping protrusions 211 are oppositely arranged on the outer peripheral wall of the charging plug 2, and a charging starting switch 2111 is arranged on at least one clamping protrusion 211; the handle 3 is pressed, and its figure is two press handle 3 symmetry to be located the relative both sides of barrel 1 periphery wall, the first end difference rotatable coupling of each press handle 3 in on the periphery wall of barrel 1. The driving rod mechanism comprises two driving rod groups which are symmetrically arranged, each driving rod group corresponds to one pressing handle 3, one end of each driving rod group is connected with the charging plug 2, the other end of each driving rod group is connected with the corresponding pressing handle 3, and the pressing handles 3 act to drive the driving rod mechanism to drive the charging plug 2 to extend out of the gun barrel 1 or retract into the gun barrel 1. And the pull-back spring 5 is arranged in the gun barrel 1, the first end of the pull-back spring 5 is connected to the charging plug 2, and the second end of the pull-back spring is connected to the gun barrel 1. The plugging mechanism comprises a first plugging mechanism 81 and a second plugging mechanism 82, the first plugging mechanism 81 and the second plugging mechanism 82 are symmetrically arranged at the first end of the gun barrel 1, and the end head of the first end of the gun barrel 1 is provided with a column barrel 13; the number of the column barrels 13 is two, the column barrels 13 are respectively and symmetrically arranged on the outer peripheral wall of the gun barrel 1, each column barrel 13 is perpendicular to the axis of the gun barrel 1, and an end cover 14 is screwed on each column barrel 13; wherein, first plug mechanism 81 and second plug mechanism 82 are respectively including inserting dead lever 802 and reset spring 803, insert dead lever 802 slidable and locate in the column casing 13, the first end orientation of inserting dead lever 802 charging plug 2 sets up, reset spring 803 cover is located on inserting dead lever 802, be equipped with flange portion 8023 on inserting dead lever 802, flange portion 8023 is located in the column casing 13, reset spring 803's first end extrusion in on the diapire of column casing 13, reset spring 803's second end extrusion in on inserting dead lever 802's flange portion 8023, insert the second end of dead lever 802 and pass and expose end cover 14.
The second end of each pressing handle 3 is provided with a claw 331, each claw 331 is used for being clamped on the corresponding column barrel 13, when two pressing handles 3 are pressed down, the charging plug 2 is pushed forward until the clamping protrusion 211 exceeds the insertion and extraction rod 802, the pressing handles 3 are continuously pressed down until the claws 331 are clamped on the column barrel 13, the second end of the pressing handle 3 is extruded at the second end of the insertion and extraction rod 802, the insertion and extraction rod 802 is pushed into the gun barrel 1, the pressing handles 3 are released, the gun barrel 1 moves towards the charging plug 2 in a small range under the action of the pull-back spring 5, the first end of the insertion and extraction rod 802 is extruded on the charging start switch 2111 on the clamping protrusion 211, and the charging start switch 2111 is opened, so that a charging circuit of the charging gun is switched on.
This is explained in more detail below with reference to the drawings.
A through cavity is formed in the gun barrel 1 along the axial direction, the through cavity sequentially comprises a first cylindrical cavity, a second cylindrical cavity and a third cylindrical cavity from the first end to the second end of the gun barrel 1, the diameter of the first cylindrical cavity is larger than that of the second cylindrical cavity, and the diameter of the third cylindrical cavity is larger than that of the second cylindrical cavity and smaller than that of the first cylindrical cavity. And a sealing ring 9 is arranged on the shoulder surface between the second cylindrical cavity and the third cylindrical cavity, a thread is formed in the third cylindrical cavity, a rear cover 16 is screwed towards the third cylindrical cavity on the second end surface of the gun barrel 1, and the sealing ring 9 is extruded on the shoulder surface by the rear cover 16. Two clamping screws 12 are arranged at the second end of the gun barrel 1, the two clamping screws 12 are symmetrically screwed on the gun barrel 1 and are respectively arranged in a direction perpendicular to the axial direction of the gun barrel 1 and penetrate into the second cylindrical cavity, and the second end of the pull-back spring 5 is clamped at the end heads of the two clamping screws 12.
Further, still seted up cylindrical sliding cavity 17 on the periphery wall of barrel 1, this sliding cavity 17 extends to the default distance from the bottom surface of first cylindrical cavity towards the second end of barrel 1, and sliding cavity 17 extends along the axial of barrel 1. The gun barrel 1 is provided with an outward extending groove 18, and the outward extending groove 18 penetrates through the sliding cavity 17 along the radial direction of the gun barrel 1. The first end of the first driving rod 41 is disposed in the sliding cavity 17, and the second end thereof extends outward from the outward extending groove 18 and is connected to the second driving rod 42. A sliding cavity 17 and a corresponding overhanging groove 18 are a group, and are arranged in two groups, and are respectively symmetrically arranged at two sides of the gun barrel 1 and respectively arranged corresponding to two driving rod groups, namely, each driving rod group is correspondingly provided with a group of sliding cavity 17 and overhanging groove 18.
Charging plug 2 includes plug body 21 and slip post 22, plug body 21 and the coaxial setting of slip post 22 are connected, and charging cable 7 certainly the second end of gun barrel 1 penetrates in the gun barrel 1, and passes in proper order back lid 16, pullback spring 5 warp slip post 22 firmly is fixed in on the plug body 21. The charging cable 7 is connected to a plurality of charging electrodes of the plug body 21. Furthermore, a contracting portion is arranged at one end of the sliding column 22 facing the rear cover 16, a clamping pin 221 is radially arranged on the contracting portion in a penetrating manner, and a first end of the pull-back spring 5 is clamped on the clamping pin 221.
The insertion and extraction rod 802 comprises a cylindrical portion 8022, a flange portion 8023 and a locking portion 8024 which are sequentially connected from a second end to a first end, the return spring 803 is sleeved on the cylindrical portion 8022, the second end of the return spring 803 is extruded on the flange portion 8023, and the first end of the return spring is extruded on the bottom wall of the column barrel 13, so that the insertion and extraction rod 802 is pulled out of a first cylindrical cavity of the through cavity. Locking part 8024 is prismatic, be equipped with first inclined plane portion on the prism, first inclined plane portion orientation the second end setting of barrel 1. Protruding 211 of card on the charging plug 2 is prismatic, be equipped with second inclined plane portion on the prism, second inclined plane portion orientation deviates from the direction setting of the second end of barrel 1, this protruding 211 of card and the cooperation of locking portion 8024 are used, be used for with charging plug 2 locking.
The pressing handle 3 comprises a retaining part 31, a holding part 32 and a pressing part 33 which are connected in sequence, and the retaining part 31, the holding part 32 and the pressing part 33 are connected in sequence from the first end to the second end of the pressing handle 3. The anti-disengaging portion 31 faces away from the gun barrel 1 and tilts, the pressing portion 33 is L-shaped, the end head of the pressing portion bends towards the gun barrel 1, and the end face of the pressing portion is used for extruding the end head of the second end of the plug rod 802. The rotatable connection point of the press handle 3 and the gun barrel 1 is located at the connection position of the anti-falling part 31 and the holding part 32 of the press handle 3.
The claw 331 comprises two elastic pieces symmetrically arranged at the second end of the pressing handle 3, and the two elastic pieces are arranged at a preset distance from each other, wherein the preset distance is greater than the width of the column casing 13. The inner wall of each elastic sheet is provided with a protruding part, and the protruding part is provided with a clamping groove 3311. The column casing 13 is a columnar structure with a rectangular cross section, two clamping columns 131 are respectively arranged on two opposite side walls of the column casing 13, the clamping columns 131 are matched with the clamping grooves 3311 for use, the clamping grooves 3311 are clamped into the clamping grooves 3311, and when the pressing handle 3 presses down, the clamping grooves 3311 are clamped on the clamping columns 131, so that the clamping jaws 331 are clamped with the column casing 13.
The first driving rod 41 comprises a first rod section and a second rod section which are connected in sequence, the first rod section is opposite to the second rod section, the second rod section is inclined at a preset angle, and the second rod section extends out of the gun barrel 1 and is connected with the second driving rod 42. A sliding slot 411 is arranged at the second end of the first driving rod 41, a sliding shaft 412 is arranged in the sliding slot 411, the first end of the second driving rod 42 is rotatably connected to the sliding shaft 412, and the second end of the second driving rod 42 is rotatably connected to the corresponding holding portion 32 of the pressing handle 3. The diameter of the sliding slot 411 is slightly smaller than the diameter of the sliding shaft 412, and the length of the sliding slot 411 is larger than the diameter of the sliding shaft 412, in this embodiment, the length of the sliding slot 411 is 1.5-2.5 times, for example, 2 times of the diameter of the sliding shaft 412. With such a structure, the locking and unlocking conversion between the clamping protrusion 211 and the plugging rod 802 on the charging plug 2 is realized.
Further, the port play of the first end of a gun section of thick bamboo 1 is equipped with elasticity protection valve 6, be equipped with two stopper 15 on the gun section of thick bamboo 1, two stopper 15 symmetry is located on the periphery wall of a gun section of thick bamboo 1, stopper 15 is used for right the range of pushing down of pressing handle 3 carries on spacingly. Further, a charging request switch is disposed on one of the two locking protrusions 211, and the charging start switch 2111 is disposed on a surface of the locking protrusion 211 opposite to the second inclined surface portion. When the charge start switch 2111 is pressed, the charge circuit forms a loop to charge the new energy vehicle. Compared with a charging gun with a hand-push type charging switch arranged outside a gun shell in the prior art, the charging starting switch 2111 is arranged inside the gun barrel 1, and the charging starting switch 2111 is controlled without being pushed by a hand, so that the charging gun is safer, and the electric shock risk of the charging gun to a human body due to electric leakage and other phenomena is reduced.
In an alternative embodiment, a charge start switch 2111 is provided on each of the two tabs 211.
The barrel 1, the press handle 3 and the two plugging mechanisms in this embodiment may be made of a non-conductive material, such as plastic. Elastic protection valve 6 includes the flange board, and locate first elasticity valve rete and second elasticity valve rete on the flange board both sides face relatively, first elasticity valve rete and second elasticity valve rete are equipped with the cross respectively and open a seam, and stagger 45 settings between opening a seam in the cross on first elasticity valve rete and the second elasticity valve rete, thereby make and form complementary structure each other between opening a seam of first elasticity valve rete and second elasticity valve rete, realized promptly that two elasticity valve rete open a seam between covering each other, make this elastic protection valve 6 form holistic airtight protective structure, can prevent outside dust, even rain, water etc. gets into in the charging plug 2 electrode that is located the through cavity.
Specifically, the charging plug 2 of the new energy automobile charging gun with the safety protection function extends outwards when in use, is accommodated in the gun barrel 1 in a non-use state, and forms closed protection by the elastic protection valve 6. This rifle that charges is when breaking away from to fill electric pile (for example charge or because the artificial damage is dilatory), and charging plug 2 still is in the protection state to make this rifle that charges can be under the circumstances such as open-air adverse circumstances, service environment is extensive, and the protection is comprehensive, the effect is better. Particularly, in a time period when the charging gun is separated from the charging pile, for example, in a process of charging the new energy automobile by taking down the charging gun from the charging pile in a dust flying winter, impurities such as dust and dust can be prevented from entering the electrode of the charging plug 2; further, for example, when the charging gun is inadvertently dropped into the muddy water on the ground, the muddy water can be prevented from entering the electrode of the charging plug 2, thereby preventing the charging electrode from being contaminated and preventing safety accidents such as electric shock from occurring.
Referring to fig. 3 to 8, when the new energy vehicle charging gun with the safety protection function in this embodiment is used, the following steps may be referred to:
1. the pressing handle 3 is pressed downwards to drive the charging plug 2 to extend outwards, the pressing handle 3 is pressed downwards to the clamping protrusion 211 on the charging plug 2 and extends out to exceed the first end of the plug-pull rod 802, one end of the clamping jaw 331 of the pressing handle 3 is not clamped on the column barrel 13, at the moment, the charging plug 2 extends out of the elastic protection valve 6, the first end of the plug-pull rod 802 is located in the peripheral wall of the gun barrel 1, namely the first end of the plug-pull rod 802 does not extend into the first cylindrical cavity of the through cavity, and then the charging plug 2 is plugged on a charging socket of a new energy automobile;
2. the pressing handle 3 is continuously pressed down until the claw 331 is clamped on the cylindrical barrel 13, at this time, the second end of the pressing handle 3 presses the plugging rod 802 into the first cylindrical cavity of the through cavity, at this time, the charging start switch 2111 on the clamping protrusion 211 and the plugging rod 802 are in a non-contact state, and the charging loop is not switched on;
3. when the handle is loosened, the pull-back spring 5 drives the column casing 13 to move in a small range towards the direction of the charging plug 2 until the first end of the plugging rod 802 presses the charging start switch 2111 on the clamping protrusion 211, so that a charging circuit of the charging gun is switched on to form a charging circuit, and the new energy automobile starts to be charged;
4. when the charging is finished, the anti-falling part 31 of the pressing handle 3 is slightly pressed, so that the clamping jaw 331 of the pressing handle 3 is separated from the column barrel 13, at the moment, the insertion and pulling rod 802 is outwards bounced until the first end of the insertion and pulling rod is separated from the first column cavity of the through cavity, the charging loop is disconnected, the power failure is firstly completed, and then the charging plug 2 is pulled out of the charging socket of the new energy automobile;
5. the pressing handle 3 is loosened, the charging plug 2 is retracted into the gun barrel 1, the charging plug 2 is accommodated in the elastic protection valve 6 again through charging, and the charging process is completed.
New energy automobile charging gun with safety protection function in this application has splendid safety protection performance. In the charging process, the charging plug 2 can be plugged and pulled only by operating the handle without being in direct contact with the charging start switch 2111, so that electric shock accidents caused by electric leakage and the like are avoided; and, when pegging graft charging plug 2 at first pegs graft on new energy automobile's charging socket with charging plug 2, then open and open through pushing down pressing handle 3 and start the switch 2111 that charges, when extracting charging plug 2, at first close the start switch 2111 that charges through pressing the first end of pressing handle 3, extract charging plug 2 again, so, make the disconnection voltage current that charges of rifle steady, further avoided the appearance of incident.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.