1. A processing method of a front cover shell is characterized in that a processing device of the processing method comprises a first processing clamp, a second processing clamp and a third processing clamp;

the first processing clamp comprises a first clamp base plate, and a first positioning mechanism, a second positioning mechanism, a first fixed supporting mechanism, a floating supporting structure and a first pressing structure are arranged on the first clamp base plate;

the second processing clamp comprises a second clamp base plate, and a third positioning mechanism, a fourth positioning mechanism, a second fixed supporting mechanism and a second pressing structure are arranged on the second clamp base plate;

the third processing fixture comprises a third bottom plate and a third fixture substrate, the third fixture substrate is arranged on the third bottom plate and is arranged in a relatively inclined mode, and a fourth positioning mechanism, a fifth positioning mechanism, a third fixed supporting mechanism and a third pressing structure are arranged on the third fixture substrate;

the first processing clamp is used for fixing the front housing body and enabling one surface of the front housing body to face upwards, the second processing clamp is used for fixing the front housing body and enabling the other opposite surface of the front housing body to face upwards, and the third processing clamp is used for fixing the front housing body and enabling one side surface of the front housing body to face upwards;

the processing method comprises a first processing procedure, a second processing procedure and a third processing procedure, wherein,

the first processing procedure comprises the following steps:

s1.1, clamping a front housing body to be machined on a first machining clamp of a first machining center, and positioning by using a first positioning mechanism, a second positioning mechanism, a first fixed supporting mechanism, a floating supporting structure and a first pressing structure;

step S1.2, milling a mounting side surface beside the phi 58 oil seal hole;

s1.3, milling a front housing mounting reference surface;

s1.4, drilling and reaming a first reference hole and a second reference hole;

step S1.5, drilling a guide hole of a phi 6 oil passage hole and a rough machining steel ball mounting hole;

step S1.6, drilling a guide hole of a phi 5 oil passage hole;

step S1.7, roughly and finely boring a phi 58 oil seal hole;

step S1.8, drilling a phi 5 oil passage hole;

step S1.9, drilling a phi 6 oil passage hole and a finish machining steel ball mounting hole, wherein the tolerance value of the aperture of the steel ball mounting hole is 0.035;

step S1.10, drilling a phi 16 connecting hole;

step S1.11, milling the hole end face of a phi 18 oil duct hole, wherein the roughness of the hole end face of the phi 18 oil duct hole is Ra6.3;

step S1.12, drilling and reaming a phi 18 oil passage hole;

step S1.13, drilling a first threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the first threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

the second processing procedure comprises the following steps:

s2.1, clamping the front housing body processed by the first processing procedure on a second processing clamp of a second processing center, and positioning by using a third positioning mechanism, a fourth positioning mechanism, a second fixed supporting mechanism and a second pressing structure;

step S2.2, roughly and finely boring a phi 95 oil seal hole;

s2.3, milling an end face of a phi 95 oil seal hole, an end face of a bolt mounting hole and an end face of a second threaded hole;

step S2.4, drilling and reaming pin holes;

s2.5, boring phi 40.1 holes and boring phi 55.5 holes, wherein the aperture tolerance value of the phi 55.5 holes is 0.08;

step S2.6, drilling a second threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the second threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

s2.7, drilling a phi 19.75 oil passage hole;

step S2.8, drilling a third threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the third threaded bottom hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;

s2.9, drilling and reaming a sensor hole, wherein the tolerance value of the aperture of the sensor hole is 0.05;

the third processing procedure comprises the following steps:

step S3.1, clamping the front housing body processed by the second processing procedure on a third processing center, and positioning by using the fourth positioning mechanism, the fifth positioning mechanism, the third fixed supporting mechanism and the third pressing structure;

s3.2, milling the end faces of a fourth threaded hole, a fifth threaded hole and a sixth threaded hole respectively;

step S3.3, drilling a fourth threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the fourth threaded bottom hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;

step S3.4, drilling a fifth threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the fifth threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

step S3.5, drilling a sixth threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the sixth threaded bottom hole is 10mm, the thread pitch is 1.5, and the tolerance grade is 6H;

and S3.6, drilling a phi 6 oil duct hole, wherein the depths of the phi 6 oil duct hole are 100mm and 169.2mm respectively.

2. The method of claim 1, wherein in step S1.3, the flatness of the front shroud mounting reference surface is 0.4, the flatness of the six individual end faces is 0.1MAX, and the roughness is ra 6.3.

3. A method of manufacturing a front cover casing according to claim 1, wherein in step S1.4, the first reference hole and the second reference hole each have a hole diameter tolerance value of 0.02.

4. The method of claim 1, wherein in step S1.7, the tolerance value of the bore diameter of the phi 58 oil seal hole is 0.046.

5. The method of claim 1, wherein in step S1.12, the tolerance values of the diameters of the phi 18 oil passage holes are all 0.021.

6. The method of claim 1, wherein in step S2.2, the tolerance value of the diameter of the phi 95 oil-sealed hole is 0.054.

7. The method of claim 1, wherein in step S2.3, the roughness of the phi 95 oil seal hole, the bolt mounting hole and the threaded hole end face are all ra 6.3.

8. The method of claim 1, wherein in step S2.4, the pin hole has a tolerance value of 0.02 in bore diameter.

9. A method of manufacturing a front cover casing according to claim 1, wherein in step S3.2, the roughness of the end faces of the fourth, fifth and sixth screw holes is Ra 25.

10. A front cover case manufactured by the front cover case manufacturing method according to any one of claims 1 to 9.

Background

The traditional machining process of the front housing of the automobile engine is special machining, the machining mode is single, the mode of machining one by one can be adopted, the dimensional stability is poor, beats among all working procedures are unbalanced, and the productivity is easy to waste.

Disclosure of Invention

In order to overcome the above disadvantages of the prior art, an object of the present invention is to provide a method for processing a front cover, which can not only improve the processing precision of an oil pan and ensure the dimensional stability of a product, but also ensure the beat balance among various processes and avoid the waste of productivity.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a processing method of a front cover shell, wherein a processing device of the processing method comprises a first processing clamp, a second processing clamp and a third processing clamp;

the first processing clamp comprises a first clamp base plate, and a first positioning mechanism, a second positioning mechanism, a first fixed supporting mechanism, a floating supporting structure and a first pressing structure are arranged on the first clamp base plate;

the second processing clamp comprises a second clamp base plate, and a third positioning mechanism, a fourth positioning mechanism, a second fixed supporting mechanism and a second pressing structure are arranged on the second clamp base plate;

the third processing fixture comprises a third bottom plate and a third fixture substrate, the third fixture substrate is arranged on the third bottom plate and is arranged in a relatively inclined mode, and a fourth positioning mechanism, a fifth positioning mechanism, a third fixed supporting mechanism and a third pressing structure are arranged on the third fixture substrate;

the first processing clamp is used for fixing the front housing body and enabling one surface of the front housing body to face upwards, the second processing clamp is used for fixing the front housing body and enabling the other opposite surface of the front housing body to face upwards, and the third processing clamp is used for fixing the front housing body and enabling one side surface of the front housing body to face upwards;

the processing method comprises a first processing procedure, a second processing procedure and a third processing procedure, wherein,

the first processing procedure comprises the following steps:

s1.1, clamping a front housing body to be machined on a first machining clamp of a first machining center, and positioning by using a first positioning mechanism, a second positioning mechanism, a first fixed supporting mechanism, a floating supporting structure and a first pressing structure;

step S1.2, milling a mounting side surface beside the phi 58 oil seal hole;

s1.3, milling a front housing mounting reference surface;

s1.4, drilling and reaming a first reference hole and a second reference hole;

step S1.5, drilling a guide hole of a phi 6 oil passage hole and a rough machining steel ball mounting hole;

step S1.6, drilling a guide hole of a phi 5 oil passage hole;

step S1.7, roughly and finely boring a phi 58 oil seal hole;

step S1.8, drilling a phi 5 oil passage hole;

step S1.9, drilling a phi 6 oil passage hole and a finish machining steel ball mounting hole, wherein the tolerance value of the aperture of the steel ball mounting hole is 0.035;

step S1.10, drilling a phi 16 connecting hole;

step S1.11, milling the hole end face of a phi 18 oil duct hole, wherein the roughness of the hole end face of the phi 18 oil duct hole is Ra6.3;

step S1.12, drilling and reaming a phi 18 oil passage hole;

step S1.13, drilling a first threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the first threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

the second processing procedure comprises the following steps:

s2.1, clamping the front housing body processed by the first processing procedure on a second processing clamp of a second processing center, and positioning by using a third positioning mechanism, a fourth positioning mechanism, a second fixed supporting mechanism and a second pressing structure;

step S2.2, roughly and finely boring a phi 95 oil seal hole;

s2.3, milling an end face of a phi 95 oil seal hole, an end face of a bolt mounting hole and an end face of a second threaded hole;

step S2.4, drilling and reaming pin holes;

s2.5, boring phi 40.1 holes and boring phi 55.5 holes, wherein the aperture tolerance value of the phi 55.5 holes is 0.08;

step S2.6, drilling a second threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the second threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

s2.7, drilling a phi 19.75 oil passage hole;

step S2.8, drilling a third threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the third threaded bottom hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;

s2.9, drilling and reaming a sensor hole, wherein the tolerance value of the aperture of the sensor hole is 0.05;

the third processing procedure comprises the following steps:

step S3.1, clamping the front housing body processed by the second processing procedure on a third processing center, and positioning by using the fourth positioning mechanism, the fifth positioning mechanism, the third fixed supporting mechanism and the third pressing structure;

s3.2, milling the end faces of a fourth threaded hole, a fifth threaded hole and a sixth threaded hole respectively;

step S3.3, drilling a fourth threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the fourth threaded bottom hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;

step S3.4, drilling a fifth threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the fifth threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

step S3.5, drilling a sixth threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the sixth threaded bottom hole is 10mm, the thread pitch is 1.5, and the tolerance grade is 6H;

and S3.6, drilling a phi 6 oil duct hole, wherein the depths of the phi 6 oil duct hole are 100mm and 169.2mm respectively.

Further, in step S1.3, the flatness of the front cover mounting reference surface is 0.4, the flatness of the six individual end surfaces is 0.1MAX, and the roughness is ra 6.3.

Further, in step S1.4, the aperture tolerance values of the first reference hole and the second reference hole are both 0.02.

Further, in step S1.7, the value of the tolerance of the aperture of the Φ 58 oil-sealed hole is 0.046.

Further, in step S1.12, the tolerance values of the diameters of the phi 18 oil passage holes are all 0.021.

Further, in step S2.2, the tolerance value of the aperture of the phi 95 oil sealing hole is 0.054.

Further, in step S2.3, the roughness of the phi 95 oil seal hole, the bolt mounting hole and the end face of the threaded hole is all ra 6.3.

Further, in step S2.4, the tolerance value of the hole diameter of the pin hole is 0.02.

Further, in step S3.2, the roughness of the end faces of the fourth, fifth and sixth screw holes is Ra 25.

Correspondingly, the invention also provides a front cover shell which is processed by the processing method of the front cover shell.

Compared with the prior art, the invention has the beneficial effects that:

according to the processing method of the front cover shell, the front cover shell is placed on the processing centers of different working procedures for rotary processing, multi-surface processing can be achieved through each clamping, positioning errors in different processing directions can be effectively eliminated, the processing precision of a product is improved, the dimensional stability of the product can be guaranteed, meanwhile, adjustable processing contents exist among the working procedures, the processing contents of the working procedures can be flexibly adjusted according to the processing beats of the working procedures during processing, the processing beats of the working procedures can be balanced, and waste of productivity is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a front view of a front housing in accordance with an embodiment of the present invention;

FIG. 2 is a rear view of the front housing in one embodiment of the present invention;

FIG. 3 is a partial view of a front cover in the direction F14 in accordance with one embodiment of the present invention;

FIG. 4 is a right side view of the front housing in an embodiment of the present invention;

FIG. 5 is a view showing the construction of a first machining jig according to the present invention;

FIG. 6 is a structural view of a second machining jig of the present invention;

FIG. 7 is a structural view of a third machining jig of the present invention;

description of reference numerals:

11-phi 58 oil seal hole side mounting side face, 12-single end face, 12-1-mounting reference face, 13-1-first reference hole, 13-2-second reference hole, 14-steel ball mounting hole, 15-phi 5 oil passage hole, 16-phi 58 oil seal hole, 17-phi 18 oil passage hole end face, 18-phi 18 oil passage hole and 19-first threaded bottom hole; 21-phi 95 oil seal hole, 22-1-phi 58 oil seal hole end face, 22-2-second thread hole end face, 22-3 bolt mounting hole end face, 23-pin hole, 24-phi 55.5 hole, 25-phi 40.1 hole, 26-second thread bottom hole, 27-phi 19.75 oil channel hole, 28-third thread bottom hole and 29-sensor hole; 31-a fourth threaded bottom hole, 32-a fifth threaded bottom hole, 33-a sixth threaded bottom hole, 311-a fourth threaded hole end face, 321-a fifth threaded hole end face, 331-a sixth threaded hole end face, 34-a fourth threaded bottom hole, 35-a first phi 6 oil channel hole, 36-a second phi 6 oil channel hole, 41-a first positioning mechanism, 42-a second positioning mechanism, 43-a first fixed supporting mechanism, 46-a floating supporting structure, 47-a first pressing structure, 51-a third positioning mechanism, 52-a fourth positioning mechanism, 53-a second fixed supporting mechanism, 54-a second pressing structure, 61-a fourth positioning mechanism, 62-a fifth positioning mechanism, 63-a third fixed supporting mechanism, and 64-a third pressing structure.

Detailed Description

In order to make the technical problems solved, technical solutions adopted, and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention are described in further detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 to 7, a processing device of the processing method includes a first processing clamp, a second processing clamp, and a third processing clamp;

the first processing fixture comprises a first fixture substrate, and a first positioning mechanism 41, a second positioning mechanism 42, a first fixed supporting mechanism 43, a floating supporting structure 46 and a first pressing structure 47 are arranged on the first fixture substrate;

the second processing fixture comprises a second fixture substrate, and a third positioning mechanism 51, a fourth positioning mechanism 52, a second fixed supporting mechanism 53 and a second pressing structure 54 are arranged on the second fixture substrate;

the third processing fixture comprises a third bottom plate and a third fixture substrate, the third fixture substrate is arranged on the third bottom plate and is arranged in a relatively inclined manner, and a fourth positioning mechanism 61, a fifth positioning mechanism 62, a third fixed supporting mechanism 63 and a third pressing structure 64 are arranged on the third fixture substrate;

the first processing clamp is used for fixing the front housing body and enabling one surface of the front housing body to face upwards, the second processing clamp is used for fixing the front housing body and enabling the other opposite surface of the front housing body to face upwards, and the third processing clamp is used for fixing the front housing body and enabling one side surface of the front housing body to face upwards;

the processing method comprises a first processing procedure, a second processing procedure and a third processing procedure, wherein,

the first processing procedure comprises the following steps:

s1.1, clamping a front housing body to be machined on a first machining clamp of a first machining center, and positioning by using a first positioning mechanism, a second positioning mechanism, a first fixed supporting mechanism, a floating supporting structure and a first pressing structure;

step S1.2, milling a phi 58 oil seal hole side mounting side surface 11;

s1.3, milling a front housing installation reference surface 12-1, wherein the flatness of the front housing installation reference surface is 0.4, the flatness of six independent end surfaces is 0.1MAX, and the roughness is Ra6.3;

s1.4, drilling and reaming a first reference hole 13-1 and a second reference hole 13-1, wherein the aperture tolerance values of the first reference hole and the second reference hole are both 0.02;

s1.5, drilling a guide hole of a phi 6 oil passage hole and a rough machining steel ball mounting hole 14;

step S1.6, drilling a guide hole of a phi 5 oil passage hole 15;

step S1.7, roughly and finely boring a phi 58 oil seal hole 16, wherein the aperture tolerance value of the phi 58 oil seal hole is 0.046;

step S1.8, drilling a phi 5 oil passage hole;

step S1.9, drilling a phi 6 oil passage hole and a finish machining steel ball mounting hole, wherein the tolerance value of the aperture of the steel ball mounting hole is 0.035;

step S1.10, drilling a phi 16 connecting hole;

step S1.11, milling a hole end surface 17 of a phi 18 oil duct hole, wherein the roughness of the hole end surface of the phi 18 oil duct hole is Ra6.3;

step S1.12, drilling and reaming a phi 18 oil passage hole 18, wherein the tolerance values of the hole diameters of the phi 18 oil passage hole are all 0.021;

step S1.13, drilling a first thread bottom hole 19 and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the first thread bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

the second processing procedure comprises the following steps:

s2.1, clamping the front housing body processed by the first processing procedure on a second processing clamp of a second processing center, and positioning by using a third positioning mechanism, a fourth positioning mechanism, a second fixed supporting mechanism and a second pressing structure;

s2.2, roughly and finely boring a phi 95 oil sealing hole 21, wherein the aperture tolerance value of the phi 95 oil sealing hole is 0.054;

s2.3, milling a phi 95 oil seal hole end face, a bolt mounting hole end face 22-3 and a second threaded hole end face 22-2, wherein the roughness of the phi 95 oil seal hole, the roughness of the bolt mounting hole and the roughness of the threaded hole end face are all Ra6.3;

s2.4, drilling and reaming a pin hole 23, wherein the tolerance value of the hole diameter of the pin hole is 0.02;

s2.5, boring a phi 40.1 hole 25 and boring a phi 55.5 hole 24, wherein the aperture tolerance value of the phi 55.5 hole is 0.08;

step S2.6, drilling a second threaded bottom hole 26 and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the second threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

s2.7, drilling a phi 19.75 oil passage hole 27;

step S2.8, drilling a third threaded bottom hole 28 and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the third threaded bottom hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;

s2.9, drilling and reaming a sensor hole 29, wherein the tolerance value of the aperture of the sensor hole is 0.05;

the third processing procedure comprises the following steps:

step S3.1, clamping the front housing body processed by the second processing procedure on a third processing center, and positioning by using the fourth positioning mechanism, the fifth positioning mechanism, the third fixed supporting mechanism and the third pressing structure;

step S3.2, respectively milling a fourth threaded hole end face 311, a fifth threaded hole end face 321 and a sixth threaded hole end face 331, wherein the roughness of the fourth, fifth and sixth threaded hole end faces is Ra 25;

step S3.3, drilling a fourth threaded bottom hole 31 and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the fourth threaded bottom hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;

step S3.4, drilling a fifth threaded bottom hole 32 and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the fifth threaded bottom hole is 6mm, the thread pitch is 1.0, and the tolerance grade is 6H;

step S3.5, drilling a sixth threaded bottom hole 33 and tapping an internal thread, wherein the nominal diameter of the thread of the internal thread of the sixth threaded bottom hole is 10mm, the thread pitch is 1.5, and the tolerance grade is 6H;

and S3.6, drilling a first phi 6 oil channel hole 35 and a second phi 6 oil channel hole 36, wherein the depths of the first phi 6 oil channel hole and the second phi 6 oil channel hole are respectively 100mm and 169.2 mm.

Therefore, according to the method for processing the front cover shell provided by the embodiment of the invention, the front cover shell is placed on the processing centers of different working procedures for rotary processing, so that multi-surface processing can be realized for each clamping, the positioning errors of different processing directions can be effectively eliminated, the processing precision of a product is improved, the dimensional stability of the product can be ensured, meanwhile, adjustable processing contents exist among the working procedures, the processing contents of the working procedures can be flexibly adjusted according to the processing beats of the working procedures during processing, the processing beats of the working procedures can be balanced, and the waste of productivity is avoided.

Correspondingly, the embodiment of the invention also provides a front cover shell which is processed by the processing method of the front cover shell in any embodiment.

In the present embodiment, thanks to the improvement of the processing method of the front cover, the front cover of the present embodiment has the advantage of good dimensional stability.

In addition, it should be noted that other contents of the front cover and the processing method thereof disclosed by the present invention can be referred to in the prior art, and are not described herein again.

In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are used in an orientation or positional relationship merely for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, configuration, and operation in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.