阅读说明：本技术 冰箱门密封条的切角机构 (Corner cutting mechanism for refrigerator door sealing strip ) 是由 赵建鑫 陈锦仁 于 2021-08-06 设计创作，主要内容包括：本发明涉及冰箱门密封条生产装置技术领域,公开了一种冰箱门密封条的切角机构,包括：切割模具,包括胶条导槽,贯穿设置于所述切割模具的内部以供冰箱门密封条通过,所述胶条导槽的内部设置有与所述冰箱门密封条配合在竖直方向上限位的凸起机构；至少两个刀片槽,设置在所述切割模具的顶部且与所述胶条导槽连接以供位于顶部的刀片切割所述冰箱门密封条；冰箱门密封条沿着胶条导槽穿过,驱动组件带动至少两个刀片进入对应的刀片槽的内部并对冰箱门密封条进行切角,切角后的废弃密封条掉落至废料槽的内部,整个切角过程在切割模具内部进行,安全可靠,且刀具不用长时间处于水汽环境中,有效地提高了切角机构的使用寿命和安全性。(The invention relates to the technical field of refrigerator door sealing strip production devices, and discloses a corner cutting mechanism of a refrigerator door sealing strip, which comprises: the cutting die comprises an adhesive tape guide groove which is arranged in the cutting die in a penetrating manner so as to allow a refrigerator door sealing strip to pass through, and a protruding mechanism which is matched with the refrigerator door sealing strip and is limited in the vertical direction is arranged in the adhesive tape guide groove; the at least two blade grooves are arranged at the top of the cutting die and connected with the rubber strip guide groove so that the blades positioned at the top can cut the refrigerator door sealing strip; the refrigerator door sealing strip passes along the adhesive tape guide slot, and drive assembly drives two at least blades and gets into the inside in the blade groove that corresponds and carries out the corner cut to the refrigerator door sealing strip, and the abandonment sealing strip behind the corner cut drops to the inside of dirty tank, and whole corner cut process is gone on inside cutting die, safe and reliable, and the cutter need not be in the steam environment for a long time, has improved corner cut mechanism's life and security effectively.)

1. The utility model provides a corner cut mechanism of refrigerator door sealing strip which characterized in that includes:

cutting die (9) comprising:

the adhesive tape guide groove (13) is arranged in the cutting die (9) in a penetrating mode so that a refrigerator door sealing strip (10) can pass through, and a protruding mechanism which is matched with the refrigerator door sealing strip (10) to limit in the vertical direction is arranged in the adhesive tape guide groove (13);

at least two blade grooves (12) which are arranged at the top of the cutting die (9) and connected with the rubber strip guide groove (13) so that a blade (8) positioned at the top can cut the refrigerator door sealing strip (10);

a waste chute (17) which is arranged near the bottom of one side of the cutting die (9) and used for dropping the cut waste refrigerator door sealing strips (10);

the at least two blades (8) are arranged above the at least two blade grooves (12) and are matched with the at least two blade grooves (12) in a one-to-one correspondence mode to realize the corner cutting of the refrigerator door sealing strip (10);

the driving assembly is connected with the at least two blades (8) so as to drive the at least two blades (8) to vertically enter the corresponding blade grooves (12).

2. The corner cutting mechanism according to claim 1, wherein the number of the blade grooves (12) is 2 and the number of the blades (8) is 2.

3. The corner cutting mechanism according to claim 2, characterized in that the two blade grooves (12) are distributed in a cross way, the two blades (8) are connected in a cross way, and the intersection point of the two blade grooves (12) and the intersection point of the two blades (8) are positioned on the same vertical straight line.

4. The corner cutting mechanism according to claim 3, characterized in that the two blade grooves (12) are at an angle of 45 ° to the horizontal projection of the glue guide groove (13).

5. The corner cutting mechanism according to claim 3, characterized in that the two mutually distant inner walls of the blade groove (12) and the two opposite inner walls of the chute (17) are located on the same vertical plane, respectively.

6. The corner cutting mechanism of claim 1, wherein the drive assembly comprises:

a blade mount (7) disposed on top of at least two of the blades (8);

the beam seat (6) is arranged at the top of the blade mounting seat (7);

one end of the floating joint (4) is connected with the top of the cross beam seat (6);

and the output end of the cylinder (3) is connected with the other end of the floating joint (4).

7. The corner cutting mechanism according to claim 6, further comprising:

the supporting seat (1), the cutting die (9) is arranged at the top of the supporting seat (1);

the supporting rods (11) are arranged at the bottom of the supporting seat (1);

the square frame (2) is arranged at the top of the supporting seat (1) and sleeved outside the cutting die (9) and the cross beam seat (6); the air cylinder (3) is arranged at the top of the square frame (2), and the output end of the air cylinder (3) penetrates through the square frame (2) and is connected with the other end of the floating joint (4).

8. The corner cutting mechanism according to claim 7, characterized in that a plurality of guide posts (5) are arranged in parallel at the top of the inner side of the square frame (2), and one end of the plurality of guide posts (5) penetrates through the cross beam seat (6) and is connected with the top of the supporting seat (1).

9. The corner cutting mechanism according to claim 6, further comprising:

the pushing hole (16) is formed above the cutting die (9), and one end of the pushing hole penetrates through the rubber strip guide groove (13) and extends to the inside of the waste trough (17);

the push rod (15) is arranged above the push hole (16), one end, far away from the push hole (16), of the push rod (15) is connected with the bottom of the cross beam seat (6), and the push rod (15) is matched with the push hole (16) and used for pushing the refrigerator door sealing strip (10) after being cut into the waste trough (17).

10. The corner cutting mechanism according to claim 1, characterized in that the bottom of the glue strip guide groove (13) is provided with an inclined surface (14).

Technical Field

The invention relates to the technical field of refrigerator door sealing strip production devices, in particular to a corner cutting mechanism of a refrigerator door sealing strip.

Background

The refrigerator door sealing strip comprises joint strip and soft magnetic stripe, penetrates soft magnetic stripe and has accomplished the joint strip of corner cut and just formed a refrigerator door sealing strip semi-manufactured goods, and the refrigerator door sealing strip semi-manufactured goods just made the refrigerator door sealing strip of completion through specific corner cut fusion welding.

In the angle cutting process in the production process of the existing refrigerator door sealing strip, an upper cutting machine, a lower cutting machine and a horizontal cutting machine are generally adopted to cut the angle, the principle is that a circular blade is installed on a motor main shaft or a special connecting main shaft and is connected with a motor output shaft through a belt, and a cylinder drives the rotating blade to move forwards and backwards horizontally or vertically to complete the angle cutting action. The mode that carries out the corner cut through cylinder drive spinning blade to the sealing strip has certain potential safety hazard, and can aggravate the wearing and tearing of cutter and motor at the lubricated process of spinning blade water spray, and then has reduced the life of device.

Disclosure of Invention

The invention aims to solve the problem that the rotating blade is sprayed with water for lubrication to aggravate the abrasion of a cutter and a motor in the prior art, and provides the corner cutting mechanism of the refrigerator door sealing strip, which has the functions of stable processing and long service life.

In order to achieve the above object, the present invention provides a corner cutting mechanism for a refrigerator door sealing strip, comprising:

a cutting die, comprising:

the adhesive tape guide groove penetrates through the cutting die to allow a refrigerator door sealing strip to pass through, and a protrusion mechanism which is matched with the refrigerator door sealing strip to limit in the vertical direction is arranged in the adhesive tape guide groove;

the at least two blade grooves are arranged at the top of the cutting die and connected with the rubber strip guide groove so that the blades positioned at the top can cut the refrigerator door sealing strip;

the waste trough is arranged near the bottom of one side of the cutting die and used for enabling the cut waste refrigerator door sealing strips to fall off;

the at least two blades are arranged above the at least two blade grooves and are matched with the at least two blade grooves in a one-to-one correspondence mode to realize the corner cutting of the refrigerator door sealing strip;

and the driving assembly is connected with the at least two blades so as to drive the at least two blades to vertically enter the corresponding blade grooves.

Optionally, the number of insert pockets is 2 and the number of inserts is 2.

Optionally, the two blade grooves are distributed in a crossed manner, the two blades are connected in a crossed manner, and the crossing point of the two blade grooves and the crossing point of the two blades are located on the same vertical straight line.

Optionally, the included angles of the horizontal projections of the two blade grooves and the rubber strip guide groove are both 45 °.

Optionally, the two inner walls of the blade groove far away from each other and the two opposite inner walls of the waste groove are respectively located on the same vertical plane.

Optionally, the drive assembly comprises:

the blade mounting seats are arranged at the tops of at least two blades;

the beam seat is arranged at the top of the blade mounting seat;

one end of the floating joint is connected with the top of the cross beam seat;

and the output end of the cylinder is connected with the other end of the floating joint.

Optionally, the corner cutting mechanism further comprises:

the cutting die is arranged at the top of the supporting seat;

the supporting rods are arranged at the bottom of the supporting seat;

the square frame is arranged at the top of the supporting seat and sleeved outside the cutting die and the cross beam seat; the cylinder sets up the top of square frame, the output of cylinder pass square frame and with the other end of floating the joint is connected.

Optionally, a plurality of guide pillars are arranged on the top of the inner side of the square frame, and one ends of the plurality of guide pillars penetrate through the cross beam seat and are connected with the top of the support seat.

Optionally, the corner cutting mechanism further comprises:

the pushing hole is formed above the cutting die, and one end of the pushing hole penetrates through the rubber strip guide groove and extends to the inside of the waste material groove;

the push rod is arranged above the push hole, one end, far away from the push hole, of the push rod is connected with the bottom of the cross beam seat, and the push rod is matched with the push hole and used for pushing the refrigerator door sealing strip after being cut into the waste chute.

Optionally, the bottom of the glue strip guide groove is provided with an inclined surface.

Through above-mentioned technical scheme, the refrigerator door sealing strip passes along the adhesive tape guide slot, and drive assembly drives two at least blades and gets into the inside in the blade groove that corresponds and carries out the corner cut to the refrigerator door sealing strip, and the abandonment sealing strip behind the corner cut drops to the inside of waste material groove, and whole corner cut process is gone on inside cutting die, safe and reliable, and the cutter need not be in the steam environment for a long time, has improved corner cut mechanism's life and security effectively.

Drawings

FIG. 1 is a schematic view showing the structure of a corner cutting mechanism of a sealing tape for a refrigerator door according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of region A of FIG. 1;

FIG. 3 is a schematic view of the position of a scrap box in a corner cutting mechanism of a refrigerator door seal according to an embodiment of the present invention;

FIG. 4 is a schematic view showing the structure of a cutting die in a corner cutting mechanism of a sealing tape for a refrigerator door according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a rubber strip guide groove in a corner cutting mechanism of a refrigerator door sealing strip according to an embodiment of the invention.

Description of the reference numerals

1. Supporting seat 2, square frame

3. Cylinder 4, floating joint

5. Guide post 6, crossbeam seat

7. Blade mount pad 8, blade

9. Cutting die 10 and refrigerator door sealing strip

11. Support rod 12 and blade groove

13. Rubber strip guide groove 14, inclined plane

15. Push rod 16, push hole

17. Waste material groove

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

FIG. 1 is a schematic view showing the structure of a corner cutting mechanism of a sealing tape for a refrigerator door according to an embodiment of the present invention; fig. 4 is a schematic structural view of a cutting die in a corner cutting mechanism of a refrigerator door sealing strip according to an embodiment of the present invention. In fig. 1 and 4, the chamfering mechanism may include a cutting die 9, at least two blades 8, and a drive assembly. In particular, the cutting die 9 may include a glue strip guide channel 13, at least two blade grooves 12, and a waste channel 17.

The rubber strip guide groove 13 penetrates through the inside of the cutting die 9 to allow the refrigerator door sealing strip 10 to pass through, and a protruding mechanism which is matched with the refrigerator door sealing strip 10 to limit in the vertical direction is arranged inside the rubber strip guide groove 13. At least two blade grooves 12 are provided at the top of the cutting die 9 and connected to the glue stripe guide channel 13 for the top blade 8 to cut the refrigerator door seal 10. A waste chute 17 is provided near the bottom of one side of the cutting die 9 for the cut-off waste refrigerator door sealing tape 10 to fall. The at least two blades 8 are arranged above the at least two blade grooves 12 and are matched with the at least two blade grooves 12 in a one-to-one correspondence mode to realize the corner cutting of the refrigerator door sealing strip 10. The drive assembly is connected to the at least two blades 8 to drive the at least two blades 8 vertically into the interior of the corresponding blade slots 12.

When needs carry out the corner cut to refrigerator door sealing strip 10, penetrate refrigerator door sealing strip 10 along the one end of adhesive tape guide slot 13, wear out at the other end of adhesive tape guide slot 13, the protruding mechanism of adhesive tape guide slot 13 inside can be spacing to going up in the vertical direction of refrigerator door sealing strip 10 for refrigerator door sealing strip 10 can only horizontal migration. After confirming the cutting position, drive assembly drives two at least blades 8 and inserts and carry out the corner cut to refrigerator door sealing strip 10 along the blade groove 12 that corresponds, and the discarded refrigerator door sealing strip 10 after the corner cut drops to the inside of waste material groove 17, the corner cut of the follow-up refrigerator door sealing strip 10 of being convenient for. The operator can carry out unified treatment and recovery to the inside abandonment refrigerator door sealing strip 10 that drops to waste chute 17. Through the protruding mechanism inside the adhesive tape guide groove 13 to the refrigerator door sealing strip 10 spacing in the vertical direction, at least two blades 8 can obtain straight cutting surfaces when cutting the refrigerator door sealing strip 10, and subsequent processing of the refrigerator door sealing strip 10 is facilitated.

In the corner cut mode of traditional refrigerator door sealing strip, generally adopt upper and lower cutting machine, horizontal cutting machine to carry out the corner cut, install circular blade on motor spindle or rotation main shaft, be connected through belt and motor output shaft, the cylinder drive rotary blade level or upper and lower direction advance and retreat the operation and accomplish the corner cut action. In this kind of corner cut mode, there is certain potential safety hazard in the blade of high-speed rotation, and need carry out water spray lubrication to the blade to carry out the cutting better to the sealing strip. But can form the steam environment at the in-process of spraying water to the blade, arbor and motor can produce wearing and tearing in being in the steam environment for a long time, and then have influenced this corner cut mechanism's life. Meanwhile, the cylinder drives the rotary blade to repeatedly move forward and backward in the horizontal or vertical direction, so that certain impact is formed on the corner cutting machine, and the stability of the corner cutting mechanism is further influenced. When the corner cutting mechanism needs to be maintained and lubricated, multi-step operation is often required, which is tedious, so that the maintenance cost is increased. Due to the position relation between the blades, the cutting angle speed of the cutting angle mechanism is limited, and the extrusion speed of 20 m/min cannot be met. In the embodiment of the invention, the corner cutting mechanism of the refrigerator door sealing strip provided by the invention adopts a mode that the blade 8 is inserted into the blade groove 12 to cut the refrigerator door sealing strip 10 in the rubber strip guide groove 13, so that the corner cutting of the refrigerator door sealing strip 10 by the blade 8 is carried out in the cutting die 9, and the potential safety hazard existing in the cutting process is further eliminated. The blade 8 does not need to be sprayed with water for lubrication in real time, and the blade 8 cannot be in a water vapor environment for a long time, so that the abrasion caused by water vapor is avoided. Drive 8 vertical removal of blade and cut refrigerator door sealing strip 10 through drive assembly, can ensure this corner cut mechanism's stability effectively, and cutting angle, maintenance and lubricated relatively more convenient, also can satisfy the demand that the line body is to higher corner cut speed. Through the corner cut mechanism of this kind of mode, improved refrigerator door sealing strip corner cut mechanism's life effectively, and this corner cut mechanism is safe and reliable more.

In this embodiment of the invention, the number of blades 8 and blade slots 12 may be of various forms known to those skilled in the art, such as 2, 4, etc. However, in a preferred example of the present invention, the number of the blades 8 and the blade grooves 12 may be as shown in fig. 3 and 4 in consideration of accuracy and rapidity in chamfering by the chamfering mechanism. Specifically, the number of the insert 8 is 2, and the number of the insert pocket 12 is 2.

In this embodiment of the present invention, as shown in fig. 3 and 4, the two blade grooves 12 are distributed in a crossed manner, the two blades 8 are connected in a crossed manner, the intersection point of the two blade grooves 12 and the intersection point of the two blades 8 are located on the same vertical line, the horizontal projection included angle between the two blade grooves 12 and the adhesive tape guide groove 13 is 45 °, and further the horizontal projection included angle between the two blades 8 and the adhesive tape guide groove 13 is 45 °. Since the refrigerator door sealing strip 10 is to ensure that the cut angles of the two ends are symmetrical to each other in the subsequent processing, and the cutting positions of the two blades 8 on the refrigerator door sealing strip 10 should be located at one of the two ends excluding the intersection point. The refrigerator door sealing strips 10 are required to be vertically connected two by two to form a frame structure, so that the cutting angles of the two ends of the refrigerator door sealing strips 10 are controlled to be about 45 degrees, and the subsequent melting welding of the cutting angles of the refrigerator door sealing strips 10 is facilitated.

In this embodiment of the invention, the inner walls of the two blade grooves 12 that are far from each other and the two opposing inner walls of the waste chute 17 are located on the same vertical plane, respectively. When two blades 8 of drive assembly drive got into and carried out the corner cut to refrigerator door sealing strip 10 along two blade grooves 12, the one side that two blades 8 kept away from each other can be along the vertical removal of inner wall of laminating with it for the cross-section of refrigerator door sealing strip 10 is more straight, also does benefit to blade 8 and carries out the corner cut to refrigerator door sealing strip 10.

FIG. 1 is a schematic view showing the structure of a corner cutting mechanism of a sealing tape for a refrigerator door according to an embodiment of the present invention; fig. 3 is a schematic diagram of the position of a scrap box in a corner cutting mechanism of a refrigerator door seal according to an embodiment of the present invention. In fig. 1 and 3, the driving assembly may include a blade mount 7, a beam mount 6, an actuating structure 4, a cylinder 3, a support base 1, a plurality of support rods 11, a square frame 2, and a plurality of guide posts 5.

The blade mount 7 is arranged on top of the two blades 8 and the beam mount 6 is arranged on top of the blade mount 7. One end of the floating joint 4 is connected with the top of the beam seat 6, and the other end of the floating joint 4 is connected with the output end of the cylinder 3. Cutting die 9 sets up at the top of supporting seat 1, and a plurality of bracing pieces 11 set up in the bottom of supporting seat 1, and square frame 2 sets up at the top of supporting seat 1, and the outside at cutting die 9 and crossbeam seat 6 is established to 2 covers of square frame, and cylinder 3 sets up at the top of square frame 2, and the output of cylinder 3 passes square frame 2 and is connected with the other end that floats and connect 4. The square frame 2 is internally provided with a plurality of guide posts 5 which are distributed in parallel, and one ends of the guide posts 5 penetrate through the cross beam seat 6 and are connected with the top of the supporting seat 1.

A plurality of bracing pieces 11 can support supporting seat 1, and the height of a plurality of bracing pieces 11 can be adjusted according to the actual operation demand in scene to do benefit to the corner cut to refrigerator door sealing strip 10. When needs carry out the corner cut to refrigerator door sealing strip 10, cylinder 3 drives the vertical downstream of crossbeam seat 6 through floating joint 4, and crossbeam seat 6 drives two blades 8 through blade mount pad 7 and gets into and carry out the corner cut to refrigerator door sealing strip 10 inside adhesive tape guide slot 13 along two blade grooves 12, and after the corner cut was accomplished, cylinder 3 drove two blades 8 again and resets, waits to the corner cut next time. In the process that the crossbeam seat 6 vertically moves, the plurality of guide pillars 5 can limit the crossbeam seat 6, so that the crossbeam seat 6 can stably vertically move, and the two blades 8 can conveniently enter the corresponding blade grooves 12. The floating joint 4 can eliminate connection errors, so that the cylinder 3 and the beam seat 6 are stabilized at the same axis, and the straight section of the refrigerator door sealing strip 10 is ensured.

In this embodiment of the present invention, the number of the support rods 11 may be various forms known to those skilled in the art, such as 3, 4, etc. However, in a preferred example of the present invention, the number of the support rods 11 may be as shown in fig. 1 in consideration of the stability of the support base 1. Specifically, the number of the support rods 11 is 4, and 4 support rods 11 are uniformly distributed at four corners of the bottom of the support rod 1.

In this embodiment of the present invention, the corner cutting mechanism further includes a fixed-length cutting system PLC, a length measuring sensor, a control solenoid valve, an upper limit magnetic switch, and a lower limit magnetic switch. Control solenoid valve sets up on cylinder 3, and length measurement sensor inlays the inner wall of establishing at adhesive tape guide slot 13 for the length of implementation monitoring refrigerator door sealing strip 10 in adhesive tape guide slot 13, control solenoid valve and length measurement sensor all insert fixed length cutting system PLC. The upper limit magnetic switch and the lower limit magnetic switch are respectively arranged at different positions on the cylinder 3 and used for controlling the minimum and maximum extension lengths of the driving blade 8 of the cylinder 3. When length measuring sensor measures the inside refrigerator door sealing strip 10 of adhesive tape guide slot 13 length and reaches corner cut length, length signal transmission to fixed length cutting system PLC, fixed length cutting system PLC gives control solenoid valve action signal, make cylinder 3 start and drive 8 vertical movements of blade, trigger 3 back to the lower spacing magnetic switch action at the cylinder, cylinder 3 resets, accomplished the corner cut to this refrigerator door sealing strip 10 this moment, touch 3 at the cylinder and stop after the upper spacing magnetic switch action, the completion that resets. And a fixed-length cutting system PLC is introduced, so that the corner cutting mechanism is more intelligent, and the corner cutting efficiency of the refrigerator door sealing strip 10 is improved.

FIG. 1 is a schematic view showing the structure of a corner cutting mechanism of a sealing tape for a refrigerator door according to an embodiment of the present invention; FIG. 2 is an enlarged schematic view of region A of FIG. 1; in fig. 1 and 2, the chamfering mechanism further includes a push hole 16 and a push rod 15.

A push hole 16 is provided above the cutting die 9, and one end of the push hole 16 passes through the rubber strip guide groove 13 and extends to the inside of the waste chute 17. The push rod 15 is arranged above the push hole 16, one end, far away from the push hole 16, of the push rod 15 is connected with the bottom of the cross beam seat 6, and the push rod 15 is matched with the push hole 16 and used for pushing the cut refrigerator door sealing strip 10 to enter the waste chute 17.

During the vertical downward movement of the blade 8 and into the blade groove 12, which is carried by the cylinder 3, the push rod 15 synchronously moves downward and enters the inside of the push hole 16. After the corner cut of the refrigerator door sealing strip 10 is completed by the blade 8, the top of the waste refrigerator door sealing strip 10 after the push rod 15 and the corner cut is contacted and pushes the waste refrigerator door sealing strip 10 to drop to the inside of the waste trough 17, so that the waste refrigerator door sealing strip 10 is prevented from being clamped between two sections of available refrigerator door sealing strips 10, and the corner cut efficiency of the refrigerator door sealing strip 10 is improved.

FIG. 5 is a schematic structural view of a rubber strip guide groove in a corner cutting mechanism of a refrigerator door sealing strip according to an embodiment of the invention. In fig. 5, the bottom of the glue guide 13 is provided with an inclined surface 14. Specifically, the inclined surface 14 may be inclined at an angle of 2 ° to 8 °. At the in-process of blade 8 to the cutting of refrigerator door sealing strip 10, the top of the preceding contact refrigerator door sealing strip 10 of blade 8 because the inside of refrigerator door sealing strip 10 is the gasbag, consequently when the cutting of blade 8, deformation takes place for the gasbag bottom and the 14 abundant contacts on inclined plane for the bottom of gasbag can realize leveling the sectional perpendicular of gasbag, and then has ensured the cutting quality of refrigerator door sealing strip 10.

Through above-mentioned technical scheme, refrigerator door sealing strip 10 passes along adhesive tape guide slot 13, and drive assembly drives the inside of two at least blade 8 entering blade groove 12 that correspond and carries out the corner cut to refrigerator door sealing strip 10, and the abandonment sealing strip behind the corner cut drops to the inside of dirty tank 17, and whole corner cut process is gone on inside cutting die 9, safe and reliable, and the cutter need not be in the steam environment for a long time, has improved corner cut mechanism's life and security effectively.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.