阅读说明：本技术 一种硅芯制备设备 (Silicon core preparation equipment ) 是由 孟兵营 王统珍 顾旭祖 李战团 于 2021-09-08 设计创作，主要内容包括：本申请公开了一种硅芯制备设备,属于硅芯加工技术领域,包括底座、滑动座、驱动装置以及打磨装置,滑动座与底座滑动连接,驱动装置安装在滑动座上,驱动装置与待加工硅芯传动连接,驱动装置能够驱动硅芯沿其轴线转动,打磨装置与底座间隔设置,打磨装置用于对硅芯进行打磨,以将硅芯的端部打磨成需要的形状和大小,滑动座带动驱动装置和硅芯移动时,能够令硅芯的一端移动至打磨装置的加工部位,从而对硅芯的端部进行打磨。本发明公开的硅芯制备设备能够将硅芯的端部打磨成各种大小和形状,以满足市场上的使用需求,采用驱动装置与打磨装置的配合,能够快速将硅芯的端部打磨成预设的形状和大小,加工效率高,且加工成品率高。(The application discloses silicon core preparation equipment belongs to silicon core processing technology field, the on-line screen storage device comprises a base, the sliding seat, drive arrangement and grinding device, sliding seat and base sliding connection, drive arrangement installs on the sliding seat, drive arrangement is connected with waiting to process the silicon core transmission, drive arrangement can drive the silicon core and rotate along its axis, grinding device and base interval set up, grinding device is used for polishing the silicon core, in order to polish into required shape and size with the tip of silicon core, when sliding seat drives drive arrangement and silicon core and removes, can make the one end of silicon core remove to grinding device's processing position, thereby polish the tip of silicon core. The silicon core preparation equipment disclosed by the invention can polish the end part of the silicon core into various sizes and shapes so as to meet the use requirements on the market, and the end part of the silicon core can be rapidly polished into the preset shape and size by adopting the matching of the driving device and the polishing device, so that the processing efficiency is high, and the processing yield is high.)

1. A silicon core preparation apparatus, comprising:

a base;

the sliding seat is connected with the base in a sliding manner;

the driving device is connected with the sliding seat and is in transmission connection with the silicon core, and the driving device can drive the silicon core to rotate along the axis of the silicon core; and

and the polishing device is used for polishing the silicon core.

2. The silicon core preparation apparatus according to claim 1, wherein the driving means comprises:

the mounting seat is connected with the sliding seat;

the clamping structure is used for mounting the silicon core and is rotationally connected with the mounting seat; and

the driving motor is connected with the sliding seat, and the driving motor drives the silicon core to rotate through the transmission assembly.

3. The silicon core preparation apparatus of claim 2, wherein the clamping structure comprises:

the hollow main shaft is connected with the mounting seat through a bearing, and a mounting hole for mounting the silicon core is formed in the hollow main shaft; and

and the pneumatic clamper is used for fixing the silicon core and the hollow main shaft.

4. The silicon core preparation apparatus of claim 3, wherein the transmission assembly comprises:

the driving wheel is in transmission connection with the driving motor;

the driven wheel is connected with the clamping structure, and the clamping structure can synchronously rotate along with the driven wheel; and

the belt is wound between the driving wheel and the driven wheel, so that the driven wheel rotates along with the driving wheel.

5. The silicon core preparation apparatus of claim 1, wherein the polishing device comprises:

a main motor;

the driving shaft is in transmission connection with the main motor;

the two grinding wheels are arranged oppositely, the two grinding wheels are connected with the driving shaft, and the rotating axis of each grinding wheel is perpendicular to the axis of the silicon core; and

and the adjusting structure is used for adjusting the distance between the two grinding wheels.

6. The silicon core preparation equipment according to claim 5, wherein the adjusting structure comprises a plurality of adjusting cushion blocks, the adjusting cushion blocks are all installed between two grinding wheels, the grinding wheels are connected with the adjusting cushion blocks, and the main motor drives the adjusting cushion blocks to rotate synchronously.

7. The silicon core preparation apparatus of claim 5, wherein the adjustment structure comprises:

a control motor mounted within the drive shaft;

the control motor is in transmission connection with the screw rod, and the screw rod and the driving shaft are coaxially arranged; and

the two control pieces are connected with the driving shaft in a sliding mode and are in threaded connection with the screw rod, the thread turning directions of the two control pieces are opposite, so that when the screw rod rotates, the two control pieces move in opposite directions, and the two control pieces are connected with the two grinding wheels in a one-to-one corresponding mode.

8. The silicon core preparation equipment as claimed in claim 7, wherein the control part is provided with a sliding block and an elastic part, the sliding block is connected with the control part in a sliding manner, the sliding block slides along the radial direction of the control part, two ends of the elastic part are respectively connected with the control part and the sliding block, and the elastic part enables the sliding block to have a tendency of moving outwards along the radial direction of the control part;

and a clamping groove used for being matched with the sliding block is formed in the grinding wheel, and the sliding block is clamped and matched with the clamping groove.

9. The silicon core preparation equipment as claimed in claim 8, wherein the control member is provided with a rotating disc, the rotating disc is connected with the screw rod by a ratchet structure, when the screw rod rotates reversely by the ratchet structure, the rotating disc and the screw rod rotate synchronously, and the rotating disc is provided with an arc-shaped groove;

be provided with on the slider be used for with arc wall complex joint portion, joint portion with the arc wall joint cooperation, so that when the rotation dish was followed reverse rotation, the slider was followed the radial inward movement of control.

10. The silicon core preparation apparatus of claim 9, wherein the rotating disk is rotationally coupled to the drive shaft.

Technical Field

The invention relates to the technical field of silicon core processing, in particular to silicon core preparation equipment.

Background

Crystalline silicon material is the most important photovoltaic material, and the market share of the crystalline silicon material is more than 90%, wherein, polycrystalline silicon is a form of simple substance silicon and can also be used as a raw material for drawing monocrystalline silicon. In practical application, the structure serving as a deposition center in the polycrystalline silicon reduction furnace is formed by assembling two longitudinally arranged and one transversely arranged crystalline silicon cores. At present, one end of a commonly used silicon core is square or round, the existing equipment can only process the silicon core with fixed size and fixed shape, the size and the shape of the silicon core cannot be adjusted, and the problems of low processing efficiency, irregular processed silicon core and the like exist.

Disclosure of Invention

The invention discloses silicon core preparation equipment, which aims to solve the problems.

The technical scheme adopted by the invention for solving the technical problems is as follows:

based on the above purpose, the present invention discloses a silicon core preparation device, comprising:

a base;

the sliding seat is connected with the base in a sliding manner;

the driving device is connected with the sliding seat and is in transmission connection with the silicon core, and the driving device can drive the silicon core to rotate along the axis of the silicon core; and

and the polishing device is used for polishing the silicon core.

Optionally: the driving device includes:

the mounting seat is connected with the sliding seat;

the clamping structure is used for mounting the silicon core and is rotationally connected with the mounting seat; and

the driving motor is connected with the sliding seat, and the driving motor drives the silicon core to rotate through the transmission assembly.

Optionally: the clamping structure includes:

the hollow main shaft is connected with the mounting seat through a bearing, and a mounting hole for mounting the silicon core is formed in the hollow main shaft; and

and the pneumatic clamper is used for fixing the silicon core and the hollow main shaft.

Optionally: the transmission assembly includes:

the driving wheel is in transmission connection with the driving motor;

the driven wheel is connected with the clamping structure, and the clamping structure can synchronously rotate along with the driven wheel; and

the belt is wound between the driving wheel and the driven wheel, so that the driven wheel rotates along with the driving wheel.

Optionally: the grinding device includes:

a main motor;

the driving shaft is in transmission connection with the main motor;

the two grinding wheels are arranged oppositely, the two grinding wheels are connected with the driving shaft, and the rotating axis of each grinding wheel is perpendicular to the axis of the silicon core; and

and the adjusting structure is used for adjusting the distance between the two grinding wheels.

Optionally: the adjusting structure comprises a plurality of adjusting cushion blocks, the adjusting cushion blocks are arranged between the two grinding wheels, the grinding wheels are connected with the adjusting cushion blocks, and the main motor drives the adjusting cushion blocks to rotate synchronously.

Optionally: the adjustment structure includes:

a control motor mounted within the drive shaft;

the control motor is in transmission connection with the screw rod, and the screw rod and the driving shaft are coaxially arranged; and

the two control pieces are connected with the driving shaft in a sliding mode and are in threaded connection with the screw rod, the thread turning directions of the two control pieces are opposite, so that when the screw rod rotates, the two control pieces move in opposite directions, and the two control pieces are connected with the two grinding wheels in a one-to-one corresponding mode.

Optionally: the control piece is provided with a sliding block and an elastic piece, the sliding block is connected with the control piece in a sliding mode, the sliding block slides along the radial direction of the control piece, two ends of the elastic piece are respectively connected with the control piece and the sliding block, and the elastic piece enables the sliding block to have a tendency of moving outwards along the radial direction of the control piece;

and a clamping groove used for being matched with the sliding block is formed in the grinding wheel, and the sliding block is clamped and matched with the clamping groove.

Optionally: the control piece is provided with a rotating disc, the rotating disc is connected with the screw rod through a ratchet structure, when the screw rod rotates reversely through the ratchet structure, the rotating disc and the screw rod rotate synchronously, and an arc-shaped groove is formed in the rotating disc;

be provided with on the slider be used for with arc wall complex joint portion, joint portion with the arc wall joint cooperation, so that when the rotation dish was followed reverse rotation, the slider was followed the radial inward movement of control.

Optionally: the rotating disc is rotatably connected with the driving shaft.

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

the silicon core preparation equipment disclosed by the invention can polish the end part of the silicon core into various sizes and shapes so as to meet the use requirements on the market, and the end part of the silicon core can be rapidly polished into the preset shape and size by adopting the matching of the driving device and the polishing device, so that the processing efficiency is high, and the processing yield is high.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic view showing a silicon core production apparatus disclosed in embodiment 1 of the present invention;

fig. 2 shows a schematic view of the drive device disclosed in embodiment 1 of the present invention;

fig. 3 shows a schematic view of a grinding device disclosed in embodiment 1 of the present invention;

FIG. 4 is a schematic diagram showing an adjustment structure disclosed in embodiment 2 of the present invention;

fig. 5 shows a schematic view of the control member disclosed in embodiment 2 of the present invention.

In the figure:

100-a base; 200-a sliding seat; 300-a drive device; 310-a mount; 321-a hollow main shaft; 322-a pneumatic gripper; 330-driving motor; 340-a transmission assembly; 400-grinding device; 410-a main motor; 420-a drive shaft; 430-grinding the grinding wheel; 440-an adjustment structure; 441-controlling the motor; 442-a screw rod; 443-a control member; 4431-a slider; 4432-an elastic member; 4433-a rotating disk; 500-silicon core.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as disclosed in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is usually understood by those skilled in the art, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

referring to fig. 1 to 3, an embodiment of the invention discloses a silicon core 500 preparation apparatus, which includes a base 100, a sliding base 200, a driving device 300, and a polishing device 400. The sliding seat 200 is installed on the base plate 100, and the sliding seat 200 is slidably connected with the base plate 100, and the sliding seat 200 can slide in a horizontal direction with respect to the base plate 100. The driving device 300 is installed on the sliding seat 200, and the driving device 300 can move synchronously with the sliding seat 200. The driving device 300 is in transmission connection with the silicon core 500 to be processed, and the driving device 300 can drive the silicon core 500 to rotate along the axis of the silicon core. The polishing device 400 is arranged at an interval with the base 100, the polishing device 400 is used for polishing the silicon core 500 to polish the end part of the silicon core 500 into a required shape and size, and when the sliding seat 200 drives the driving device 300 and the silicon core 500 to move, one end of the silicon core 500 can be moved to the processing part of the polishing device 400, so that the end part of the silicon core 500 is polished.

Before use, the shape and size of the silicon core 500 to be polished are confirmed, if the end of the silicon core 500 needs to be polished into a round shape, the driving device 300 drives the silicon core 500 to rotate continuously while the sliding seat 200 moves relative to the base 100, so that after polishing is completed, the end of the silicon core 500 is polished into a cylinder with a proper size; if the end of the silicon core 500 is to be polished into a rectangle, before the sliding seat 200 moves, the driving device 300 drives the silicon core 500 to rotate for a certain angle and then stops rotating, then the silicon core is sent to the polishing part of the polishing device 400 by the sliding seat 200, and is withdrawn after polishing is finished, then the driving device 300 drives the silicon core 500 to rotate for 90 degrees again, and then the silicon core is sent into the polishing device 400, and after polishing is finished, the end of the silicon core 500 is polished into a rectangle with a proper size. Of course, the above processing is only a circular or square processing manner, in other embodiments, if the end of the silicon core 500 is to be processed into a regular hexagon or other shapes, only the rotation angle of the silicon core 500 driven by the driving device 300 needs to be changed, and of course, the above polishing process needs to be repeated many times.

The silicon core 500 preparation equipment disclosed in the embodiment can polish the end part of the silicon core 500 into various sizes and shapes to meet the use requirements on the market, and the end part of the silicon core 500 can be rapidly polished into a preset shape and size by adopting the matching of the driving device 300 and the polishing device 400, so that the processing efficiency is high, and the processing yield is high.

The positions of the base 100 and the polishing apparatus 400 are fixed in advance relative to each other. A sliding groove is formed in the base 100, and a clamping block for being matched with the sliding groove is arranged on the sliding seat 200 and clamped in the sliding groove. The sliding seat 200 is guided by the matching of the sliding grooves and the clamping blocks, so that the sliding of the sliding seat 200 is more stable, and the sliding seat 200 cannot deviate in the process of polishing the silicon core 500.

In this embodiment, the extending direction of the sliding groove is perpendicular to the axial direction of the silicon core 500, so that when the silicon core 500 enters the polishing device 400, the silicon core 500 enters along the radial direction of the silicon core 500, thereby preventing the end of the silicon core 500 from directly contacting the polishing device 400 to generate impact. Because the silicon core 500 is basically cylindrical when being manufactured, the silicon core 500 enters the polishing device 400 along the radial direction to form certain buffering, and the polishing device 400 is prevented from directly contacting the maximum diameter position of the silicon core 500, so that the polishing device 400 is protected from the precious people, and the yield is improved.

The shape of the sliding slot on the base 100 can be various, such as the sawtooth shape in fig. 1, and in other embodiments, the sliding slot can be a dovetail slot, a "T" slot, or a general groove.

The driving device 300 includes a mounting base 310, a clamping structure, a driving motor 330, and a transmission assembly 340. The mounting seat 310 and the driving motor 330 are both mounted on the sliding seat 200, the clamping structure is rotatably connected with the mounting seat 310, the clamping structure is used for clamping and fixing the silicon core 500, and when the clamping structure rotates relative to the mounting seat 310, the silicon core 500 can synchronously rotate along with the clamping structure.

The clamping structure includes a hollow spindle 321 and a pneumatic clamp 322 for fixing the silicon core 500 with the hollow spindle 321. The two pneumatic grippers 322 are provided, and the two pneumatic grippers 322 are respectively located at two ends of the hollow spindle 321, so that the silicon core 500 is fixed more stably. The hollow spindle 321 is a hollow structure, the silicon core 500 passes through the hollow spindle 321, and the hollow spindle 321 is connected with the mounting seat 310 through a bearing.

The driving motor 330 is connected with the clamping structure through the transmission assembly 340, and when the driving motor 330 works, the clamping assembly and the silicon core 500 can be driven to rotate through the transmission assembly 340. Specifically, the transmission assembly 340 includes a driving pulley, a driven pulley, and a belt. The driving wheel is in transmission connection with the driving motor 330, the driven wheel is connected with the clamping structure, the clamping structure can synchronously rotate along with the driven wheel, and the belt is wound between the driving wheel and the driven wheel so as to enable the driven wheel to rotate along with the driving wheel. The driving motor 330 works to drive the driving wheel to rotate, so as to drive the driven wheel and the clamping structure connected with the driven wheel to rotate through the belt, and further drive the silicon core 500 to rotate.

Of course, the belt transmission of the transmission assembly 340 is only one embodiment of the present embodiment, and in other embodiments, the contamination inspection assembly may be a gear transmission or the like.

In some embodiments of the present embodiment, the grinding device 400 includes a main motor 410, a drive shaft 420, an adjustment structure 440, and two oppositely disposed grinding wheels 430. The main motor 410 is in transmission connection with the driving shaft 420, the two grinding wheels 430 are both mounted on the driving shaft 420, the main motor 410 can drive the two grinding wheels 430 to synchronously rotate, and when the sliding seat 200 drives the silicon core 500 to move, the end part of the silicon core 500 to be processed can enter between the two grinding wheels 430, so that the silicon core 500 is ground, and the size of the silicon core 500 after grinding is consistent with the distance between the two grinding wheels 430. The adjusting structure 440 is used to adjust the distance between the two grinding wheels 430, so as to control the size of the end of the silicon core 500 after being ground, and the shape of the end of the silicon core 500 is adjusted by the driving motor 330.

In this embodiment, the adjusting structure 440 includes a plurality of adjusting cushion blocks, the adjusting cushion blocks are installed between the two grinding wheels 430, and the distance between the two grinding wheels 430 can be changed by changing the number of the adjusting cushion blocks, so as to change the size of the end portion of the silicon core 500 after being ground. The adjusting block is installed at the output end of the main motor 410, and the adjusting block can rotate the grinding wheel 430 synchronously, thereby ensuring the stability of the grinding wheel 430 and the adjusting block.

Example 2:

referring to fig. 4 and fig. 5, this embodiment also discloses a silicon core 500 preparation apparatus, and this embodiment is a further improvement on the technical solution of embodiment 1, and the technical solution described in embodiment 1 is also applicable to this embodiment, and the technical solution disclosed in embodiment 1 is not described again.

Specifically, the difference between this embodiment and embodiment 1 is that the adjustment structure 440 of the silicon core 500 preparation apparatus disclosed in this embodiment is different from that in embodiment 1.

The adjusting structure 440 of the silicon core 500 preparation apparatus disclosed in this embodiment includes a control motor 441, a lead screw 442, and two control members 443. The control motor 441 is installed in the driving shaft 420, the control motor 441 is in transmission connection with the screw rod 442, and the screw rod 442 is coaxially arranged with the driving shaft 420. The two control members 443 are slidably connected to the driving shaft 420, the two control members 443 are threadedly connected to the screw shaft 442, the threads of the two control members 443 are oppositely threaded, so that when the screw shaft 442 rotates, the two control members 443 move in opposite directions, and the two control members 443 are correspondingly connected to the two grinding wheels 430. The screw rod 442 is driven to rotate by the control motor 441, and the connecting driving piece can be driven to move at the same time. When the driving motor 330 drives the screw rod 442 to rotate in the forward direction, the two control members 443 drive the two grinding wheels 430 to approach each other; when the driving motor 330 drives the screw rod 442 to rotate reversely, the two control members 443 drive the two grinding wheels 430 to move away from each other.

Referring to fig. 5, in the present embodiment, the clockwise direction in fig. 5 is taken as the forward direction, and the counterclockwise direction in fig. 5 is taken as the reverse direction.

A slider 4431, an elastic member 4432 and a rotating disk 4433 are provided on the control member 443. The slider 4431 is slidably connected to the control member 443, the slider 4431 slides along the radial direction of the control member 443, both ends of the elastic member 4432 are respectively connected to the control member 443 and the slider 4431, and the elastic member 4432 makes the slider 4431 have a tendency to move outward along the radial direction of the control member 443. A clamping groove used for being matched with the sliding block 4431 is formed in the grinding wheel 430, and the sliding block 4431 is in clamping fit with the clamping groove. When the grinding wheel assembly is installed, the slider 4431 can be retracted into the control part 443 by pressing the slider 4431, then after the grinding wheel 430 is moved to a specified position, the slider 4431 protrudes out of the surface of the control part 443 again under the action of the elastic part 4432 and is clamped with the grinding wheel 430, so that the control part 443 is connected with the grinding wheel 430, and then when the grinding wheel 430 works, the slider 4431 also has a tendency to move outwards along the radial direction of the control part 443 under the action of centrifugal force, so that the connection between the control part 443 and the grinding wheel 430 is more stable, and the grinding wheel 430 is prevented from loosening relative to the control part 443 when working.

The rotating disc 4433 is rotatably connected with the driving shaft 420, and the rotating disc 4433 is coaxially arranged with the driving shaft 420. A ratchet structure is provided between the rotating disc 4433 and the lead screw 442, by which the rotating disc 4433 and the lead screw 442 are rotated in synchronization when the lead screw 442 is rotated in a reverse direction, and the rotating disc 4433 is not affected by the rotation of the lead screw 442 when the lead screw 442 is rotated in a forward direction,

the diameter of the rotating disk 4433 is set to be larger so that after one end of the slider 4431 is clamped into the grinding wheel 430, a part of the other end of the slider 4431 in the axial direction of the driving shaft 420 is overlapped with the rotating disk 4433, the slider 4431 is provided with a clamping part at the part, and the rotating disk 4433 is correspondingly provided with an arc-shaped groove which is clamped and matched with the clamping part.

When the rotating disc 4433 rotates reversely with the screw rod 442 after the clamping portion is clamped on the rotating disc 4433, the rotating disc 4433 can drive the sliding block 4431 to move inwards along the radial direction of the control member 443, so that the grinding wheel 430 can be conveniently installed. After the grinding wheel 430 moves to a proper position, the control motor 441 drives the screw rod 442 to move forward, although the rotating disc 4433 is not driven by the screw rod 442 to rotate, the slider 4431 has a tendency to move outward along the radial direction of the control member 443 under the action of the elastic member 4432, so that the rotating disc 4433 has a tendency to rotate in the forward direction, and after the rotating disc 4433 moves in the forward direction, the slider 4431 can be clamped into the clamping groove, so that the mounting between the control member 443 and the grinding wheel 430 is completed. Then, when the driving motor 330 continues to drive the screw shaft 442 to rotate in the forward direction, the screw shaft 442 can drive the two control members 443 and the two grinding wheels 430 to approach each other.

When the grinding wheel 430 needs to be replaced after being used for a period of time, the control motor 441 is used for driving the screw rod 442 to rotate reversely, the two control members 443 are away from each other until the clamping portion on the sliding block 4431 is clamped into the arc-shaped groove on the rotating disc 4433 again, the screw rod 442 continues to rotate reversely, the rotating disc 4433 can drive the sliding block 4431 to return to the control members 443, and at the moment, the grinding wheel 430 can be taken down.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.