CN215753204U

CN215753204U - Novel automatic corner wrapping and protecting machine

Info

Publication number: CN215753204U
Application number: CN202121539988.0U
Authority: CN
Inventors: 黄斌斌; 黄静
Original assignee: Suzhou Shengcheng Solar Equipment Co Ltd
Current assignee: Suzhou Shengcheng Solar Equipment Co Ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2022-02-08
Anticipated expiration: 2031-07-07

Abstract

The utility model discloses a novel automatic corner wrapping machine which comprises a rack, a conveyor, a corner protecting paper bin mechanism, a corner folding mechanical arm, a protective cover and a right-angle door, wherein the conveyor for conveying a photovoltaic assembly is installed on the rack, a blocking assembly is vertically arranged at the output of the conveyor, a correcting assembly is arranged around the conveyor, the corner protecting paper bin mechanism and the corner folding mechanism are arranged at four right-angle positions of the rack, the corner folding mechanical arm is also installed on the rack, the protective cover is arranged around the rack, and the right-angle door convenient for feeding is arranged at the four right-angle positions of the protective cover. Through the mode, the corner protector packaging machine is compact in structure and stable in operation, completes the complex actions of corner protector packaging, can be suitable for packaging different types of corner protector paper, can avoid the situation that the corner protector paper is deformed when the corner protector paper is not in place, and is convenient to feed and discharge.

Description

Novel automatic corner wrapping and protecting machine

Technical Field

The utility model relates to the technical field of solar photovoltaic module production, in particular to a novel automatic corner wrapping and protecting machine.

Background

After the production of the solar photovoltaic assembly is completed, the solar photovoltaic assembly is easy to collide in the carrying process, particularly, the right-angle position of a product is easy to crack or even damage due to collision, so that corners of the product are often wrapped, the types of corner protecting paper are various, different corner protecting paper feeding mechanisms are usually needed, the capacity of the existing corner protecting paper is limited, the feeding is required to be performed at regular intervals of 1-2 hours, the operation is complex, and the lower layer of corner protecting paper is easy to adsorb in the feeding process.

Some angle bead wrapping machines are available in the market at present, but most of the angle bead wrapping machines have single performance, only aim at angle bead paper with the same shape, and actually have different shapes as shown in figure 1, but the same points exist in various angle protection papers, the angle protection papers are provided with a right-angle edge a, and outer edges b and c corresponding to the two right-angle edges a, during the feeding process of the angle protection papers, the phenomenon that a plurality of products are adsorbed at one time is often accompanied, the lower layer of the stock paper is easy to adsorb, if the adsorption force is reduced, the products can not be adsorbed, chinese patent CN212448241U of this company discloses a corner protector paper feeding mechanism for a corner protector wrapping machine, the top of the periphery of the angle bead paper is provided with an angle bead scraping blade, the angle bead paper can be adsorbed only by the great adsorption force at the last time, the requirement on power elements is high, the cost is high, in addition, the corner protection paper has long material supply and an unstable structure, and the condition that the whole pile of corner protection paper is inclined is easy to occur.

During the folding and forming process of the outer corner protection paper, the situation that the folded edge is not in place and the vertical edge is arched is easy to occur, and based on the defects and the shortcomings, the prior art is necessary to be improved, and a novel automatic corner protection wrapping machine is designed.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problem of providing a novel automatic corner protector wrapping machine which is compact in structure, stable in operation, capable of completing complex actions of corner protector paper packaging, suitable for packaging different types of corner protector paper, capable of avoiding deformation caused by the fact that the corner protector paper is not in place and convenient to feed and discharge.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a novel automatic angle bead wrapping machine, this kind of novel automatic angle bead wrapping machine include frame, conveyer, angle bead paper feed bin mechanism, book angle bead mechanism, angle bead manipulator, guard shield and right angle door, install the conveyer that is used for carrying photovoltaic module in the frame, the vertical of conveyer output has the subassembly that blocks, and the conveyer is equipped with the subassembly of reforming all around, and four right angles departments of frame all are provided with angle bead paper feed bin mechanism and book angle bead mechanism, still install angle bead manipulator in the frame, are equipped with the guard shield all around the frame, and four right angles departments of guard shield set up the right angle door with the material loading of being convenient for.

Preferably, angle bead paper feed bin mechanism includes feed bin main part frame, servo motor, flitch, angle bead fixed guide subassembly and the fixed subassembly in feed bin upper strata, the feed bin main part is erect and is arranged in the frame, installs servo motor on the vertical board of feed bin main part frame, installs the flitch that is used for stacking a buttress angle bead paper on servo motor's the active cell, and angle bead paper encloses all around and is equipped with the angle bead fixed guide subassembly, and the angle bead fixed guide subassembly sets up on feed bin main part frame bottom plate, the fixed subassembly in feed bin upper strata is installed at the vertical board top of feed bin main part frame, and the fixed subassembly fixed connection in feed bin upper strata is passed through on angle bead fixed guide subassembly upper portion.

Preferably, the fixed guide subassembly of angle bead is including adjusting bottom plate, section bar, group material spare and the sensor that targets in place, and three adjusting bottom plates pass through the fix with screw on the bottom plate of feed bin main part frame, be provided with the waist type hole that is used for adjusting position on the adjusting bottom plate and be used for locking fixed screw hole, adjusting bottom plate upper portion is provided with vertical section bar, and three section bars are right angle triangle and distribute, and the section bar contacts with right angle limit an and outside b and c of angle bead paper respectively, establish on the flitch and dodge the opening with the section bar, the group material spare relative with angle bead paper is installed at the section bar top, it is the form of falling triangle to dial the material spare, the sensor that targets in place that is used for detecting angle bead paper is still installed on section bar upper portion.

Preferably, the fixed subassembly in feed bin upper strata includes square mount, connecting plate, packaging plate and locking screw, square mount sets up in the vertical board top of feed bin main part frame, and square mount top is provided with the standing groove, has placed the connecting plate in the standing groove, and the packaging plate is equipped with to the square mount upper cover of connecting plate top, and connecting plate and packaging plate horizontal direction are mutually perpendicular, are equipped with on connecting plate and the packaging plate and adjust waist type hole, and the connecting plate stretches out the end and passes through locking screw and section bar top fixed connection.

Preferably, book angle bead mechanism includes angle bead support, jacking cylinder, right angle backup pad, vacuum chuck, vertical face hem subassembly and horizontal plane hem subassembly, the angle bead support is driven by drive module, and drive module sets up in the frame, installs the jacking cylinder on the vertical board of angle bead support, installs the right angle backup pad that is used for placing angle bead paper on the slip table of jacking cylinder, the vacuum chuck that is used for adsorbing angle bead paper is installed to the extension department on the two right angle sides of right angle backup pad, still installs vertical face hem subassembly on the vertical board of angle bead support, vertical face hem subassembly bottom is installed two sets of horizontal plane hem subassemblies relative with the right angle side of right angle backup pad.

Preferably, the vertical surface flanging assembly comprises a first sliding table cylinder, a lifting plate and side folded plates, the first sliding table cylinder is vertically arranged on the vertical plate of the corner protection support, the lifting plate is arranged on a sliding table of the first sliding table cylinder, two groups of vertically arranged side folded plates are arranged on the lifting plate, and the side folded plates are opposite to the right-angle side of the right-angle support plate; the horizontal plane hem subassembly includes second slip table cylinder and horizontal folded plate, second slip table cylinder sets up on the jacking board, installs horizontal folded plate on the second slip table cylinder, and two horizontal folded plate looks remote site are equipped with dodges the inclined plane, all be equipped with the sucking disc on jacking board and the horizontal folded plate and dodge the opening.

Preferably, the dog-ear manipulator includes four-axis manipulator, link, lift cylinder, sucking disc mounting panel, sucking disc and dog-ear board, the link is installed to four-axis manipulator's wrist department, and the lift cylinder is installed to the link both sides, and lift cylinder drive sucking disc mounting panel removes, installs the sucking disc that sets up down on the sucking disc mounting panel, dog-ear board is installed to the link lower part, it dodges the groove to be equipped with the sucking disc on the dog-ear board, dog-ear board both sides symmetry is provided with dog-ear groove, dog-ear groove comprises rectangle dog-ear opening, dog-ear and dog-ear inclined plane, is equipped with dog-ear opening on the dog-ear board, dog-ear opening outside symmetry is provided with two dog-ear inside, and the dog-ear inclined plane that the dog-ear outwards extended and is equipped with the direction.

Compared with the prior art, the utility model has the beneficial effects that:

the structure is compact, the operation is stable, the complex action of corner protector paper packaging is completed, and the corner protector packaging machine is suitable for packaging different types of corner protector paper;

the vertical surface edge folding assembly and the horizontal surface edge folding assembly are separately arranged, so that the situation that the package is not in place and deforms can be avoided, and the side edge of the corner protection paper is prevented from deforming like an arch;

the right-angle door is convenient to open, and the corner protecting paper is convenient to feed and discharge.

Drawings

Fig. 1 is a schematic view of various types of corner paper.

Fig. 2 is a schematic structural diagram of a novel automatic corner wrapping and protecting machine.

Fig. 3 is a schematic view of a first view angle structure of a corner protection paper bin mechanism of a novel automatic corner protection wrapping machine.

Fig. 4 is a schematic view of a second view angle structure of a corner protection paper bin mechanism of a novel automatic corner protection wrapping machine.

Fig. 5 is a schematic view of a first view angle structure of a corner folding and protecting mechanism of the novel automatic corner wrapping and protecting machine.

Fig. 6 is a schematic view of a second view angle structure of a corner folding and protecting mechanism of the novel automatic corner wrapping and protecting machine.

Fig. 7 is a schematic structural view of a folding manipulator of a novel automatic corner wrapping and protecting machine.

Fig. 8 is a schematic view of a corner protector paper structure.

Figure 9 is a side view of a wrapped corner paper product.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and will thus define the scope of the utility model more clearly and clearly.

Referring to fig. 1 to 9, an embodiment of the present invention includes:

the utility model provides a novel automatic angle bead wrapping machine, this kind of novel automatic angle bead wrapping machine include frame 1, conveyer 2, angle bead paper feed bin mechanism 3, roll over angle bead mechanism 4, dog-ear manipulator 5, guard shield 6 and right angle door 7, install the conveyer 2 that is used for carrying photovoltaic module in the frame 1, the vertical of 2 outputs of conveyer has the subassembly that blocks, and conveyer 2 encloses all around and is equipped with the subassembly of normalizing, and four right angles departments of frame 1 all are provided with angle bead paper feed bin mechanism 3 and dog-ear mechanism 4, still install dog-ear manipulator 5 in the frame 1, and frame 1 encloses all around and is equipped with guard shield 6, and four right angles departments of guard shield 6 set up the right angle door 7 with the material loading of being convenient for.

Angle bead paper feed bin mechanism 3 includes feed bin main part frame 31, servo motor 32, flitch 33, the fixed direction subassembly 34 of angle bead and the fixed subassembly 35 in feed bin upper strata, feed bin main part frame 31 sets up in frame 1, installs servo motor 32 on the vertical board of feed bin main part frame 31, installs the flitch 33 that is used for stacking a buttress angle bead paper on servo motor 32's the active cell, and angle bead paper encloses all around and is equipped with the fixed direction subassembly 34 of angle bead, and angle bead fixed direction subassembly 34 sets up on feed bin main part frame 31 bottom plate, the fixed subassembly 35 in feed bin upper strata is installed at the vertical board top of feed bin main part frame 31, and the fixed subassembly 35 fixed connection in feed bin upper strata is passed through on 34 upper portion of angle bead fixed direction subassembly.

The corner protection fixing guide assembly 34 comprises an adjusting bottom plate 341, a section 342, a material stirring piece 343 and a position sensor 344, three adjusting bottom plates 341 are fixed on the bottom plate of the bin main body frame 31 through screws, the adjusting bottom plate 341 is provided with a kidney-shaped hole 3411 for adjusting position and a screw hole 3412 for locking and fixing, the upper part of the adjusting bottom plate 341 is provided with a vertical section bar 342, the three section bars 342 are distributed in a right triangle, the section bars 342 are respectively contacted with a right-angle side a and outer sides b and c of the angle protecting paper, the three section bars 342 are used for limiting the degree of freedom of the angle protecting paper in the horizontal direction, the material plate 33 is provided with a section material avoiding opening 330, the top of the section material 342 is provided with a material poking part 343 opposite to the corner protection paper, the material poking part 343 is in an inverted triangle shape, when the angle protecting paper is leather paper, the material shifting part 343 adopts a brush, when the angle protecting paper is Valencia paper, the material shifting part 343 adopts an aluminum block, the upper part of the section bar 342 is also provided with an in-position sensor 344 for detecting angle paper.

The upper-layer fixing assembly 35 of the storage bin comprises a square fixing frame 351, a connecting plate 352, an encapsulating plate 353 and a locking screw 354, wherein the square fixing frame 351 is arranged at the top of a vertical plate of the storage bin main body frame 31, a placing groove is formed in the top of the square fixing frame 351, the connecting plate 352 is placed in the placing groove, the encapsulating plate 353 is covered on the square fixing frame 351 above the connecting plate 352, the connecting plate 352 and the encapsulating plate 353 are mutually vertical in the horizontal direction, adjusting waist-shaped holes 350 are formed in the connecting plate 352 and the encapsulating plate 353, and the extending end of the connecting plate 352 is fixedly connected with the top of the section bar 342 through the locking screw 354.

The angle bead mechanism 4 includes angle bead support 41, jacking cylinder 42, right angle backup pad 43, vacuum chuck 44, vertical face hem subassembly 45 and horizontal plane hem subassembly 46, angle bead support 41 is driven by drive module, and drive module sets up in frame 1, installs jacking cylinder 42 on the vertical board of angle bead support 41, installs the right angle backup pad 43 that is used for placing angle bead paper on jacking cylinder 42's the slip table, the vacuum chuck 44 that is used for adsorbing angle bead paper is installed to the extension department on the two right angle sides of right angle backup pad 43, still installs vertical face hem subassembly 45 on the vertical board of angle bead support 41, vertical face hem subassembly 45 bottom is installed two sets of horizontal plane hem subassemblies 46 relative with the right angle side of right angle backup pad 43.

The vertical surface flanging assembly 45 comprises a first sliding table cylinder 451, a lifting plate 452 and side folded plates 453, wherein the first sliding table cylinder 451 is vertically arranged on a vertical plate of the corner protection bracket 41, the lifting plate 452 is arranged on a sliding table of the first sliding table cylinder 451, two groups of vertically arranged side folded plates 453 are arranged on the lifting plate 452, and the side folded plates 453 are opposite to the right-angle edges of the right-angle supporting plate 43; the horizontal surface folding assembly 46 comprises a second sliding table cylinder 461 and a horizontal folding plate 462, the second sliding table cylinder 461 is arranged on the lifting plate 452, the horizontal folding plate 462 is arranged on the second sliding table cylinder 461, the opposite ends of the two horizontal folding plates 462 are provided with avoiding inclined planes 460, and the lifting plate 452 and the horizontal folding plate 462 are both provided with suction cup avoiding openings.

Dog-ear manipulator 5 includes four-axis manipulator 51, link 52, lift cylinder 53, sucking disc mounting panel 54, sucking disc 55 and dog-ear board 56, four-axis manipulator 51's wrist department installs link 52, and lift cylinder 53 is installed to link 52 both sides, and lift cylinder 53 drives sucking disc mounting panel 54 and removes, installs the sucking disc 55 that sets up down on the sucking disc mounting panel 54, dog-ear board 56 is installed to link 52 lower part, it dodges the groove to be equipped with the sucking disc on dog-ear board 56, dog-ear board 56 both sides symmetry is provided with dog-ear groove 560, dog-ear groove 560 comprises rectangle dog-ear opening 561, dog-ear 562 and dog-ear inclined plane 563, is equipped with dog-ear opening 561 on the dog-ear 56, and dog-ear opening 561 outside symmetry is provided with two inward dog-ear 562, and dog-ear 562 outwards extends and is equipped with the dog-ear inclined plane 563 of direction.

When the novel automatic angle bead wrapping machine works, a photovoltaic assembly to be wrapped with an angle bead is input through the conveyor 2 and conveyed in place, the blocking assembly blocks the photovoltaic assembly, the correcting assembly corrects four sides of the photovoltaic assembly, the right-angle door 7 is manually opened, a stack of angle bead paper is manually placed on the material plate 33 on the angle bead paper bin mechanism 3, as shown in fig. 8, the positions of three sectional materials 342 are adjusted until the sectional materials 342 are respectively contacted with the right-angle side a and the outer sides b and c of the angle bead paper, the three sectional materials 342 are used for limiting the degree of freedom of the angle bead paper in the horizontal direction, then the position of the connecting plate 352 is adjusted according to the position of the sectional material 342, finally the connecting plate 352 and the sectional materials 342 are fixed together through the locking screws 354, the angle bead wrapping action is started, the servo motor 32 drives the material plate 33 to move upwards, the angle bead paper moves along the guiding direction of the sectional materials 342, when the in-place sensor 344 detects the angle bead paper, the angle folding manipulator 5 works, the suction cup 55 sucks the top layer angle bead paper, meanwhile, the three material shifting pieces 343 in the shape of an inverted triangle form resistance in the vertical direction to block the next angle bead paper from being sucked together, the angle folding manipulator 5 picks the angle bead paper and places the angle bead paper on the right angle support plate 43 of the angle folding mechanism 4, the vacuum suction cup 44 sucks the angle bead paper, the driving module drives the right angle support plate 43 with the angle bead paper to move to the position below the right angle of the photovoltaic module, the jacking cylinder 42 drives the right angle support plate 43 to move upwards, the area A of the angle bead paper is tightly attached to the right angle bottom surface of the frame of the photovoltaic module, the vacuum suction cup 44 breaks vacuum, the vertical surface edge folding assembly 45 works at the moment, the first sliding table cylinder 451 drives the jacking plate to move upwards, the side folding plate 453 on the jacking plate 452 folds the area B of the angle bead paper into a vertical state and abuts against the outer frame of the photovoltaic module, the side folding plate 453 is always abutted against the side area B of the angle protection paper to avoid the side deformation and the occurrence of the arch, then the two sets of horizontal surface folding assemblies 46 work, the second sliding table cylinder 461 drives the horizontal folding plate 462 to move, the horizontal folding plate 462 is pushed to the area C of the movable angle protection paper to be contacted with the top surface of the frame of the photovoltaic assembly, the horizontal folding plate 462 is always pressed against the area C of the angle protection paper, then the angle folding manipulator 5 works, the angle folding plate 56 pushes the extending part of the angle protection paper to the inner side of the frame of the photovoltaic assembly, and the angle protection operation is finished as shown in fig. 9.

The novel automatic corner protector wrapping machine is compact in structure and stable in operation, can finish the complex actions of corner protector paper packaging, can be suitable for packaging different types of corner protector paper, can avoid the situation that the corner protector paper is deformed when not in position, and is convenient to feed and discharge.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a novel automatic package angle bead machine which characterized in that: this kind of novel automatic package angle bead machine includes frame, conveyer, angle bead paper feed bin mechanism, book angle bead mechanism, dog-ear manipulator, guard shield and right angle door, install the conveyer that is used for carrying photovoltaic module in the frame, the vertical of conveyer output has the subassembly that blocks, and the conveyer is equipped with the subassembly of reforming all around, and four right angles departments of frame all are provided with angle bead paper feed bin mechanism and book angle bead mechanism, still installs dog-ear manipulator in the frame, are equipped with the guard shield all around the frame, and four right angles departments of guard shield set up the right angle door with the material loading of being convenient for.

2. The novel automatic corner protector wrapping machine as claimed in claim 1, wherein: the angle bead paper feed bin mechanism comprises a feed bin main body frame, a servo motor, a material plate, an angle bead fixed guide assembly and a feed bin upper layer fixed assembly, wherein the feed bin main body frame is arranged on the frame, the servo motor is arranged on a vertical plate of the feed bin main body frame, the material plate used for stacking a pile of angle bead paper is arranged on a rotor of the servo motor, the angle bead paper is surrounded with the angle bead fixed guide assembly, the angle bead fixed guide assembly is arranged on a bottom plate of the feed bin main body frame, the feed bin upper layer fixed assembly is arranged at the top of the vertical plate of the feed bin main body frame, and the feed bin upper layer fixed assembly is fixedly connected to the upper portion of the angle bead fixed guide assembly.

3. The novel automatic corner protector wrapping machine as claimed in claim 2, wherein: the fixed direction subassembly of angle bead is including adjusting bottom plate, section bar, group material spare and the sensor that targets in place, and on three adjusting bottom plate passed through the fix with screw in the bottom plate of feed bin main part frame, be provided with the waist type hole that is used for adjusting position on the adjusting bottom plate and be used for locking fixed screw hole, adjusting bottom plate upper portion is provided with vertical section bar, and three section bars are right angle triangle and distribute, and the section bar contacts with angle bead paper's right angle limit an and outside b and c respectively, it dodges the opening to establish with the section bar on the flitch, and the section bar top is installed and is dialled the material spare relative with angle bead paper, it is the shape of falling triangle to dial the material spare, the sensor that targets in place that is used for detecting angle bead paper is still installed on section bar upper portion.

4. The novel automatic corner protector wrapping machine as claimed in claim 3, wherein: the upper-layer fixing assembly of the storage bin comprises a square fixing frame, a connecting plate, an encapsulating plate and a locking screw, wherein the square fixing frame is arranged at the top of a vertical plate of a storage bin main body frame, a placing groove is formed in the top of the square fixing frame, the connecting plate is placed in the placing groove, the encapsulating plate is arranged on the square fixing frame above the connecting plate in a covering mode, the connecting plate and the encapsulating plate are perpendicular to each other in the horizontal direction, adjusting waist-shaped holes are formed in the connecting plate and the encapsulating plate, and the extending end of the connecting plate is fixedly connected with the top of the section bar through the locking screw.

5. The novel automatic corner protector wrapping machine as claimed in claim 1, wherein: the angle bead folding mechanism comprises an angle bead support, a jacking cylinder, a right-angle support plate, a vacuum chuck, a vertical face edge folding assembly and a horizontal face edge folding assembly, wherein the angle bead support is driven by a driving module, the driving module is arranged on the frame, the jacking cylinder is arranged on a vertical plate of the angle bead support, the right-angle support plate used for placing angle bead paper is arranged on a sliding table of the jacking cylinder, the vacuum chuck used for adsorbing the angle bead paper is arranged at the extending part of two right-angle edges of the right-angle support plate, the vertical face edge folding assembly is further arranged on the vertical plate of the angle bead support, and the two sets of horizontal face edge folding assemblies which are opposite to the right-angle edges of the right-angle support plate are arranged at the bottom of the vertical face edge folding assembly.

6. The novel automatic corner protector wrapping machine as claimed in claim 5, wherein: the vertical surface flanging assembly comprises a first sliding table cylinder, a jacking plate and side folded plates, the first sliding table cylinder is vertically arranged on a vertical plate of the corner protection bracket, the jacking plate is arranged on a sliding table of the first sliding table cylinder, two groups of vertically arranged side folded plates are arranged on the jacking plate, and the side folded plates are opposite to the right-angle edges of the right-angle supporting plates; the horizontal plane hem subassembly includes second slip table cylinder and horizontal folded plate, second slip table cylinder sets up on the jacking board, installs horizontal folded plate on the second slip table cylinder, and two horizontal folded plate looks remote site are equipped with dodges the inclined plane, all be equipped with the sucking disc on jacking board and the horizontal folded plate and dodge the opening.

7. The novel automatic corner protector wrapping machine as claimed in claim 1, wherein: dog-ear manipulator includes four-axis manipulator, link, lift cylinder, sucking disc mounting panel, sucking disc and dog-ear board, four-axis manipulator's wrist department installs the link, and the lift cylinder is installed to the link both sides, and lift cylinder drive sucking disc mounting panel removes, installs the sucking disc that sets up down on the sucking disc mounting panel, dog-ear board is installed to the link lower part, it dodges the groove to be equipped with the sucking disc on the dog-ear board, dog-ear board both sides symmetry is provided with dog-ear groove, dog-ear groove comprises rectangle dog-ear opening, dog-ear and dog-ear inclined plane, is equipped with dog-ear opening on the dog-ear board, dog-ear opening outside symmetry is provided with two inside dog-ear, and the dog-ear inclined plane that the dog-ear outwards extends and is equipped with the direction.