A kind of mould structure for avoiding product from staying cover half
A kind of injection mold is the utility model is related to, more particularly, to a kind of mould structure for avoiding product from staying cover half.
Plastic cement products are very universal in production and daily life, and wherein injection molding is then most commonly seen one
Kind plasthetics molding mode, it generally includes the cover half on the upside of die joint, the dynamic model on the downside of die joint and top plate etc., wherein
Cover half be provided with sprue bush, forming part corresponding with the upper and lower surface of product is respectively equipped with fixed half and moving half.For
The product after shaping is set to rest on dynamic model side, the forming part on usual cover half is die cavity corresponding with the profile of product,
And the forming part on dynamic model is core corresponding with the inner chamber of product.When injection mold is fixed on injection machine, injection machine
Injecting head projects the molten plastic cement of high pressure, and plastic cement enters the molding cavity being made up of die cavity and core by the running channel that enters of cover half
It is interior, product is become after cooling, and then dynamic model, top plate etc. divide mould relative to cover half movement, and the product of shaping is because of cooling meat
And rest on the core of dynamic model, now top plate acts, and drives push rod ejecting product from core, you can product is removed, so as to
Complete single injection-molded.One bag of core generation that can be alignd because of cooling meat internal in shaping due to plasthetics
Mould power, therefore, in order to ensure the product after shaping can be rested on dynamic model, in order to which product is ejected by ejecting mechanism, people
Deisgn product shape and structure and mould structure when would generally make dynamic model side Bao Moli be more than cover half side bag
Mould power.For example, for the box-like product of an one end open, we can design the lateral wall of product on the die cavity of cover half,
The madial wall of product is designed on the core of dynamic model, the opening of product then forms the die joint of mould.So, formed product is worked as
During point mould, on the core that the product of cooling meat can rest on dynamic model in the presence of Bao Moli, the then push rod of ejecting mechanism
The madial wall of product can be promoted, so as to which product be separated with core, personnel easy to operation remove product, and ensure the outside of product
Face has smooth beautiful outward appearance.But the shape of injecting products, structure and the requirement to surface are various, examples
Such as, there is the concavo-convex product of upper and lower both direction for one, as it was previously stated, when formed product, can be because of fixed half and moving half two
The Bao Moli in individual direction makes product produce torsional deformation, and serious meeting makes product eventually settle on cover half, so as to lead to not
Pickup.In the prior art, people set the knot of some auxiliary typically by the larger positions of the cover half Bao Moli in product
Structure, artificially increase the Bao Moli of dynamic model side, so that Bao Moli of product during shaping in dynamic model side is more than cover half one
The Bao Moli of side, but such design can be limited by product structure and requirement etc., and can also greatly increase
The difficulty of final ejecting mechanism ejecting product, makes product occur pushing up white flaw of Denging because of excessive ejecting force, so as to cause
Product finally can only meet the injection molding demand of product by changing overall structure design.
The content of the invention
The purpose of this utility model is easy because of cover half one present in existing injection mould structure in order to solve
The problem of side part Bao Moli is larger, so as to cause product reliably can not rest on dynamic model, there is provided one kind can avoid product
The mould structure of cover half is stayed, is not only simple in structure reliably, and dynamic model side is rested on after can ensure that formed product, is effectively solved
Certainly product distortion deforms, even rests on cover half the problem of leading to not pickup.
To achieve these goals, the utility model uses following technical scheme：
A kind of mould structure for avoiding product from staying cover half, including the cover half on top, the dynamic model of bottom and ejecting mechanism,
Forming part corresponding with the upper and lower surface of product is respectively equipped with the cover half, dynamic model, the position of forming part is corresponded on cover half
Provided with can depression bar, the dynamic model be provided with depression bar lockable mechanism, depression bar locking machine in axial sliding along the moving direction of dynamic model
Structure makes the depression bar and dynamic model keep lockup state, and the cover half is provided with depression bar unlocking mechanism, after formed product dynamic model and
When cover half divides mould, depression bar lockable mechanism makes depression bar and dynamic model synchronizing moving first, and depression bar driving product overcomes the bag of cover half side
The forming part synchronizing moving of mould power and dynamic model；When dynamic model is moved to the forming part disengagement of product and cover half, depression bar unlocking mechanism
Action, so as to release locking of the depression bar lockable mechanism to depression bar, then dynamic model is continued to move to, and depression bar is then rested on cover half with moving
Mould separates；When dynamic model and cover half divide mould in place, ejecting mechanism action make the moulding section of product and dynamic model from, you can from dynamic model
On remove product.
It is more than the Bao Moli of dynamic model forming part product for some Bao Moli in the forming part of cover half, this practicality is new
Type sets depression bar by corresponding to the position of forming part on cover half, and the depression bar lockable mechanism by being arranged on dynamic model makes depression bar
Be connected with dynamic model, so, when dynamic model and cover half divide mould, depression bar can follow dynamic model synchronizing moving so that product with it is fixed
The forming part of mould is forcibly separating.That is, depression bar serves the effect of a similar push rod, it will production with the mobile of dynamic model
Product are lifted off the forming part of cover half, so as to can ensure that in forming part that product rests on dynamic model all the time when dividing mould, in order to final
Product is ejected by ejecting mechanism, so as to facilitate the pickup of product, is effectively prevented from because of product diverse location fixed half and moving half
Bao Moli difference and occur torsional deformation in addition tear.And the depression bar unlocking mechanism on cover half can then divide a timing of mould
Wait makes depression bar lockable mechanism release the locking to depression bar in time, depression bar is departed from the linkage in dynamic model and eventually settles at cover half
Preferably, being provided with the chute of insertion both sides in the cover half, sliding bar is provided with chute, the depression bar is fixed in
On sliding bar, corresponding to that die joint position is additionally provided with cover half can be fixed along the moving direction locating rod in axial sliding of dynamic model
One end of position bar is fixed on sliding bar, and the other end of locating rod flushes with the die joint of cover half.
Multiple depression bars can be set on sliding bar, to be more than the Bao Moli of dynamic model forming part in the Bao Moli of multiple cover half
Position sets depression bar respectively, so as to simplify the Synchronization Control to multiple depression bars.Particularly, on the one hand locating rod can play guiding
The effect of bar, is advantageous to the smooth movement of sliding bar and depression bar, while can make depression bar reliable location in the axial direction, it is ensured that depression bar
Lower end flushed with the forming part surface of cover half.When dynamic model and cover half matched moulds, dynamic model can promote locating rod to move, so that sliding
Lever, depression bar parking position accuracy.
Preferably, the depression bar lockable mechanism includes being hinged on the hook bar on the outside of dynamic model, bar is hooked close to cover half one
End is provided with L-shaped drag hook, and the L-shaped drag hook hooks the end of sliding bar, and the depression bar unlocking mechanism includes being arranged on the outside of cover half
With the unblock push rod of L-shaped drag hook correspondence position, the unblock push rod is provided with driving projection close to the one end side of dynamic model, and driving is convex
The both sides up and down of block are respectively equipped with driving inclined-plane, and when dynamic model divides mould with cover half after formed product, hooking the L-shaped drag hook of bar makes cunning
Lever keeps synchronizing moving with dynamic model, and then makes the forming part synchronizing moving of depression bar driving product and dynamic model；When dynamic model is moved to
When driving inclined-plane on the upside of driving projection contacts with L-shaped drag hook, driving inclined-plane driving L-shaped drag hook, so that hooking bar laterally
Rotate, and then L-shaped drag hook is disengaged with sliding bar, product and the forming part of cover half now disengage；When dynamic model moves towards cover half
During dynamic and matched moulds, the driving inclined-plane on the downside of projection is driven first to be contacted with L-shaped drag hook, so that hook bar laterally rotates, now
Sliding bar outer end can cross L-shaped drag hook；When locating rod contacts with the die joint of dynamic model, you can driving sliding bar is in chute
Interior movement, until the die joint of dynamic model contacts with the die joint of cover half completes matched moulds, driving projection now crosses L-shaped drag hook,
The outer end of sliding bar reclines L-shaped drag hook and positioned.
Depression bar lockable mechanism can make sliding bar drive multiple depression bars balancedly to move in chute, and be arranged on the outside of dynamic model
Hook bar, unblock push rod etc. on the one hand convenient processing, installation, while can reliably hooking sliding bar, and being advantageous in production
Maintenance.Particularly, we can be by adjusting length dimension of the driving projection on dynamic model moving direction, i.e. two drivings up and down
The distance between inclined-plane, it is ensured that divide during mould the locking released when the forming part of product and cover half is kept completely separate to depression bar, and
Drive the driving inclined-plane on the downside of projection first to be contacted with L-shaped drag hook in matched moulds, avoid colliding between sliding bar and L-shaped drag hook
Preferably, the dynamic model is provided with fulcrum bearing, fulcrum bearing is provided with turning groove, the bottom hinge for hooking bar
It is connected in turning groove, hooks the storage tank for being provided with Long Circle on bar at fulcrum bearing downside, dynamic model side is provided with and stretches into appearance
The lead in groove is put, the retaining spring for compressing and hooking bar is arranged with lead.
Retaining spring can drive hook bar close towards cover half and sliding bar side, so that reliably hooking sliding bar,
And lead can then make retaining spring reliable location, storage tank can avoid hook bar from being interfered when rotating with lead, together
When ensure that retaining spring has reliable positioning all the time, avoid its from being distorted or even deviate from.
Preferably, being threaded with the adjusting screw set along dynamic model moving direction in the fulcrum bearing, hook on bar
It is provided with locating piece on the upside of the fulcrum bearing, the tail end on the upside of the adjusting screw is against locating piece.
When retaining spring drives and hooks bar and turn to the inside, the side of locating piece against adjusting screw tail end, so as to
Make hook bar reliable location.We can be conveniently adjusted the orientation angle for hooking bar by adjusting screw, so that it is guaranteed that hooking bar
The unblock of hooking and unblock push rod to hook bar to sliding bar.
Preferably, the forming part of cover half includes being used for the main forming part of shaped article and is arranged on main forming part edge
Assistant formation groove, connecting groove is provided between main forming part and assist formation groove, supplemented by the depth of the connecting groove
For a quarter of the depth of furtherance connected in star to 1/3rd, the depression bar is located at corresponding assist formation groove location.
When the upper surface of some products has higher appearance requirement, and local cover half Bao Moli is larger, this reality
With the new main forming part side larger by the Bao Moli in cover half, assist formation groove is set, and by connecting groove with determining
The main forming part of mould is connected.So, when product injection molding, you can an auxiliary block is molded in assist formation groove,
Connection sheet is then molded in connecting groove, so that auxiliary block is linked into an integrated entity by the edge of connection sheet and product.When dividing mould
Depression bar pushes down auxiliary block, so as to make product rest on dynamic model side by connection sheet.After product takes out, we only need to use cutter
Cut off connection sheet, you can auxiliary block is separated with product, so as to obtain complete product, avoid leaving pressure in the upper surface of product
The vestige of bar.
Preferably, the upper end of the depression bar is provided with supporting studs, positioning mode is provided with depression bar and supporting studs junction
Orchid, the supporting studs are threaded on sliding bar.
The studdle on the one hand convenient connection with sliding bar, while sliding bar and depression bar can be made in the mobile side of dynamic model
Positioned upwards.Particularly, studdle can provide depression bar reliable axially support, avoid the flexural deformation of sliding bar.
Preferably, the cover half include the cover half pressing plate provided with sprue bush and be fixed on the downside of cover half pressing plate and provided with into
The solid plate in type portion, the chute penetrate the upper surface of solid plate upwards, the supporting studs stretch out the upper end of sliding bar against
The lower surface of cover half pressing plate, the upper end that sliding bar is stretched out in supporting studs are arranged with spacing compression spring.
Cover half is spliced to form by cover half pressing plate and solid plate, so as to be advantageous to the processing of chute, facilitates sliding bar, depression bar etc.
Installation and maintenance.And spacing compression spring then can be such that sliding bar is reliably positioned at when dynamic model divides mould in place on the bottom surface of chute.
So, during matched moulds, when the driving projection for unlocking push rod laterally rotates hook bar and when being in released state, L-shaped drag hook energy
Reliably cross the end of sliding bar, it is ensured that sliding bar can be caught on by hooking bar, and avoid colliding interference with hooking bar.
Therefore, the utility model has the advantages that：Be not only simple in structure it is reliable, and after can ensure that formed product
Dynamic model side is rested on, product distortion deformation is efficiently solved, even rests on cover half the problem of leading to not pickup.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the utility model in matched moulds state.
Fig. 2 is structural representation of the utility model when dividing mould.
In figure：1st, cover half pressing plate 11, sprue bush 2, solid plate 21, chute 22, main forming part 23, auxiliary into
Type groove 24, connecting groove 3, moving platen 31, fulcrum bearing 311, turning groove 32, lead 33, positioning are recessed
Groove 34, adjusting screw 35, locking nut 4, feet 5, dynamic model pressing plate 6, top plate 61, push rod 7, sliding bar
71st, sliding bar 711, supporting studs 712, locating flange 72, locating rod 73, spacing compression spring 8, hook bar 81, L
Shape drag hook 82, storage tank 83, locating piece 9, unblock push rod 91, driving projection 911, driving inclined-plane.
The utility model is further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1 and Figure 2, a kind of mould structure for avoiding product from staying cover half, including the cover half on top, bottom it is dynamic
Mould and the ejecting mechanism for being arranged on dynamic model side.In order to facilitate processing and assembling, cover half includes the cover half provided with sprue bush 11
Pressing plate 1 and it is fixed in the solid plate 2 on the downside of cover half pressing plate with bolt, solid plate sets is molded corresponding with the upper surface of product
Portion, the downside of solid plate have a die joint.Dynamic model then includes moving platen 3, the pad of the left and right being arranged on the downside of moving platen two
Pin 4 and the dynamic model pressing plate 5 being arranged on the downside of feet, forming part corresponding with the lower surface of product, dynamic model are set on moving platen
The upside of plate has a die joint, moving platen, feet, dynamic model pressing plate can be consolidated by bolt it is integral, so as to moving platen,
Formation one ejects space between dynamic model pressing plate and the feet of left and right two, the setting top plate 6 in the ejection space, on top plate
The forming part position of corresponding moving platen sets some push rods 61, so as to the ejecting product after formed product divides mould.When cover half and move
When mould is in matched moulds state, together with the die joint of solid plate is bonded to each other with the die joint of moving platen, so as to cover half into
The die cavity of a closing is formed between type portion and the forming part of dynamic model.When the molten plastic cement of HTHP enters in die cavity,
Required product can be cooled into.Certainly, it would be desirable to which corresponding cooling water channel is set on fixed half and moving half.Due to injection
The sprue bush of mould, ejecting mechanism, cooling water channel etc. belong to the state of the art, do not do excessive description herein.
In addition, it is necessary to illustrate, cover half side is referred to as upside in the present embodiment, dynamic model side is referred to as downside, correspondingly, divides mould
When dynamic model moving direction be above-below direction, above-mentioned restriction be not be to be directed to mould use state on horizontal injection molding machine
It should be noted that we can be embedded moving die insert on moving platen, fixed die insert, dynamic model are embedded on solid plate
On forming part be arranged on moving die insert, the forming part on cover half is arranged on fixed die insert, so as to convenient processing and manufacturing.
The utility model is applied to products of the local Bao Moli more than the Bao Moli of lower surface correspondence position of upper surface,
That is in the prior art, when such product moves after shaping, cover half divides mould, a part for product can be wrapped in dynamic model
In forming part, another part of product can be then wrapped in the forming part of cover half, so as to cause the tearing of product, torsional deformation,
Even result in whole product and eventually settle at cover half side, make product can not pickup.
In order to ensure the product after shaping rests on dynamic model side, it would be desirable to set insertion two in the upper surface of solid plate
The chute 21 of side, chute is interior to set the sliding bar 7 that can slide up and down, and chute is stretched out in the left and right ends of sliding bar.On solid plate
The position of corresponding forming part is set can be along the moving direction of dynamic model（That is above-below direction）Depression bar 71 in axial sliding, under depression bar
End face flushes with the forming part surface of solid plate, and the upper end of depression bar is coaxially disposed integral supporting studs 711, and in depression bar and
Supporting studs junction sets the locating flange 712 radially extended out, and supporting studs are threaded on sliding bar, and locating flange
Then recline the lower surface of sliding bar, so that sliding bar is positioned in above-below direction.The length of supporting studs is more than sliding bar
Thickness so that supporting studs stretch out the upper end of sliding bar against the lower surface of cover half pressing plate, so, you can sliding bar with
Leaving gap between cover half pressing plate, and depression bar then can obtain the secure support of supporting studs.
In addition, it would be desirable to depression bar lockable mechanism is set on dynamic model, depression bar unlocking mechanism is set on cover half.Work as product
When dynamic model divides mould with cover half after shaping, depression bar lockable mechanism makes depression bar keep lockup state with dynamic model, so that depression bar and dynamic model
Synchronizing moving, correspondingly, depression bar driving product overcome the Bao Moli of cover half side and the forming part synchronizing moving of dynamic model；Work as dynamic model
When being moved to the forming part of product and cover half and disengaging, the Bao Moli of cover half side disappears, and now depression bar unlocking mechanism releases depression bar
Lockable mechanism is continued to move to the locking of depression bar, dynamic model, and depression bar is then rested on solid plate and separated with dynamic model；When dynamic model and cover half
Point mould in place when, ejecting mechanism action make the moulding section of product and dynamic model from, you can product is removed from dynamic model.
Further, we can correspond to die joint position setting 2 in solid plate and can determine in axial sliding along above-below direction
Position bar 72, the upper end of locating rod are fixed on sliding bar, and the lower end of locating rod flushes with the die joint of cover half.Locating rod can play
The effect of guide rod, is advantageous to the smooth movement of sliding bar and depression bar, while can make depression bar reliable location in the axial direction, it is ensured that
The lower end of depression bar flushes with the forming part surface of cover half.
In order to facilitate processing and manufacturing and follow-up maintenance, the utility model sets depression bar lockable mechanism in the outside of dynamic model,
Correspondingly, depression bar unlocking mechanism is set in the outside of cover half.Specifically, depression bar lockable mechanism includes being arranged on the outside of dynamic model along upper
The hook bar 8 of lower direction arrangement, fulcrum bearing 31 is set on the side of moving platen bottom, turn of a U-shaped is set in fulcrum bearing
Dynamic groove 311, the bottom for hooking bar is hinged in the turning groove of U-shaped by jointed shaft.Hook on bar above fulcrum bearing
And L-shaped drag hook 81 is provided with close to the upper end of cover half side, L-shaped drag hook hooks the end that sliding bar stretches out chute.It is appreciated that
It is that depression bar lockable mechanism should preferably set two, and is separately positioned on the left and right sides of dynamic model, that is to say, that we can be
The left and right sides of dynamic model sets hook bar respectively, the L-shaped drag hooks of two hook bars can hooking sliding bar simultaneously left and right ends, from
And sliding bar is set evenly to slide.
In addition, bar lower end position is correspondingly hooked in the side of dynamic model sets horizontal lead 32, one is arranged on lead
Individual retaining spring 33, one end of retaining spring compress dynamic model side, and the other end compresses the side hooked on bar below fulcrum bearing
Face, so as to drive the upper end for hooking bar to be rotated towards inner side, L-shaped drag hook can hooking sliding bar.In addition, hook bar on the downside of with
The storage tank 82 of a Long Circle is can be set in lead corresponding position, and lead is then stretched into storage tank, so that retaining spring begins
Effective positioning is can obtain eventually, avoids retaining spring from being distorted or even deviate from, and the storage tank of Long Circle can avoid hooking bar
Interfered when rotating with lead.
We can also be threadedly coupled an adjusting screw set along the vertical direction 34 in fulcrum bearing, hook and be located on bar
Place sets a locating piece 83 on the upside of fulcrum bearing, and the tail end on the upside of adjusting screw is against locating piece, so that hooking bar reliably calmly
Position.When we rotate adjusting screw, you can pass through the orientation angle of locating piece adjustable hook peg.Certainly, we can adjusted
The tail end of the upward Extension support seat of screw sets a locking nut 35, so that adjusting screw locking, avoids it from loosening
Depression bar unlocking mechanism of the present utility model is corresponding with depression bar lockable mechanism, it is therefore preferred that depression bar unlocks
The quantity of mechanism is two, and is separately positioned on the left and right sides of cover half.Specifically, depression bar unlocking mechanism includes being arranged on cover half
Outside and the unblock push rod 9 of L-shaped drag hook correspondence position, the unblock push rod are arranged and are located at cover half and corresponding side along the vertical direction
Hook bar between, unlock the lower end of push rod and driving projection 91, the same edge of driving projection be set close to the lateral surface for hooking bar
Above-below direction extends, and a chamfering is set respectively in the outward flange of the upper and lower both sides of driving projection, so as to form driving inclined-plane
911.When dynamic model divides mould with cover half after formed product, the L-shaped drag hook of two hook bars makes sliding bar is synchronous with dynamic model holding to move
It is dynamic, and then make the forming part synchronizing moving of depression bar driving product and dynamic model, and the unblock push rod being arranged on cover half then with hook
Bar produces relative displacement；When dynamic model is moved to certain position, drive the driving inclined-plane on the upside of projection to be contacted with L-shaped drag hook, drive
Dynamic inclined-plane driving L-shaped drag hook is displaced outwardly, and is hooked bar and is laterally rotated, until L-shaped drag hook disengages with sliding bar, product now
Disengaged with the forming part of cover half, now sliding bar is rested in the chute of cover half, and drives projection then mutually to be reclined with L-shaped drag hook
Together；When dynamic model and cover half divide mould in place, unblock push rod is kept completely separate with hooking the L-shaped drag hook of bar, and depression bar takes off with product
Open, ejecting mechanism now can eject product from the forming part of dynamic model, so as to easily pickup, to complete product
One-shot forming process；When dynamic model is mobile towards cover half and during matched moulds, drive the driving inclined-plane on the downside of projection first to be connect with L-shaped drag hook
Touch, laterally rotated so that hooking bar, sliding bar outer end now can cross L-shaped drag hook；When locating rod and point of dynamic model
When type face contacts, you can driving sliding bar moves in chute, until the die joint of dynamic model contacts completion with the die joint of cover half
Matched moulds, driving projection now cross L-shaped drag hook, and the outer end of sliding bar then reclines L-shaped drag hook and positioned.
It should be noted that the upper end that we can stretch out sliding bar in supporting studs is arranged a spacing compression spring 73, so,
When the forming part that dynamic model and cover half start a point mould, product and cover half disengages, L-shaped drag hook disengages with sliding bar, and spacing compression spring
Can then sliding bar be continued to move to, until being positioned at the bottom surface of chute.That is, when L-shaped drag hook and sliding bar disengage, it is sliding
Spacing should be left between lever and the bottom surface of chute, during so as to avoid sliding bar from the moving and bottom surface of chute produces interference.This
Outside, the width of L-shaped drag hook should be greater than the width of sliding bar, and unlocks push rod and be then positioned close at sliding bar.So, L-shaped is worked as
When drag hook hooks slip boom end, the part downside of L-shaped drag hook is abutted on sliding bar upper side, and unlocks the driving of push rod
Inclined-plane then can be with the contacts side surfaces of L-shaped drag hook remainder.
When the upper surface of some products, local cover half Bao Moli is larger, that is to say, that when shaping divides mould, product at this
Easily there is bag cover half phenomenon, and product has higher appearance requirement in the upper surface of the position, and therefore, the position is uncomfortable
Depression bar is preferably set.Therefore, we the forming part on solid plate can be arranged to it is corresponding with the upper surface of product, for be molded produce
The main forming part 22 of product, and the assistant formation groove 23 positioned at main forming part edge, main forming part and assist formation groove it
Between connecting groove 24 is set, a quarter of the depth of furtherance connected in star is to 1/3rd supplemented by the depth of connecting groove.Accordingly
Ground, depression bar are then arranged on the position that assist formation groove is corresponded in solid plate, now the lower end of depression bar and assist formation groove
Bottom surface flushes.So, when product injection molding, you can an auxiliary block, connecting groove are molded in assist formation groove
Connection sheet is inside then molded, so that auxiliary block is linked into an integrated entity by the edge of connection sheet and product, auxiliary block becomes production
The external extension of product.When dividing mould, depression bar pushes down auxiliary block, so as to make product rest on dynamic model side by connection sheet.Certainly, when
After product takes out, we need to cut off connection sheet with cutter, auxiliary block is separated with product, so as to obtain complete product.Also
It is to say, by setting assist formation groove, had both can ensure that the larger products of the Bao Moli of cover half side rested on dynamic model when dividing mould
Side, while can avoid leaving the vestige of depression bar in the region that the upper surface of product has high requirement.It is it is understood that auxiliary
Furtherance connected in star should be arranged on the main forming part edge of the larger positions of Bao Moli of corresponding cover half.