CN100562422C - A kind of jetting-moulding screw of plastic jetting-moulding machine - Google Patents
A kind of jetting-moulding screw of plastic jetting-moulding machine Download PDFInfo
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- CN100562422C CN100562422C CNB200710100143XA CN200710100143A CN100562422C CN 100562422 C CN100562422 C CN 100562422C CN B200710100143X A CNB200710100143X A CN B200710100143XA CN 200710100143 A CN200710100143 A CN 200710100143A CN 100562422 C CN100562422 C CN 100562422C
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- check ring
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- screw head
- screw
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Abstract
The present invention is a kind of jetting-moulding screw of plastic jetting-moulding machine with the non-return effect of the feed back of preventing, is made up of screw head, check ring, thrust ring and screw rod body.The novel check ring that has inward flange and a dop, have the screw head of grooving radially and have the thrust ring of step surface, by the closed excellent sealing ability that realizes of the slip of check ring inward flange and screw head cylinder, check ring inner ring surface and thrust ring step surface, eliminated the leakage problem that melt granules, pollutant or other foreign material did not cause.During injection, the face area that check ring is big guarantees to realize starting fast, shortens the check ring closing time.Promote the further mixing of melt during the plasticizing of the radial cut groove of screw head, backflow that can buffer melt during injection reduces the leakage current amount of melt, has improved the precision of metering.
Description
Technical field
The present invention relates to a kind of screw rod of injection molding machine of plastic, particularly have the injection screw of the non-return effect of the feed back of preventing.
Background technology
Injection screw is one of vital part of injection machine.It rotates in the machine barrel of injection machine, and mainly effect is exactly with solid-state plastic pellet or plastic powders fusion plastification, stores the plastics injection mould that measures, will store into more a certain amount of molten state, ejects after the mold cools down, obtains plastic products.
Band shape non-return screw head screw rod (as shown in Figure 1) is by forming with the lower part in the injection screw: screw head 1, check ring 2, thrust ring 3 and screw rod body 4.Check ring wraps on the screw head circular cylinder between conical screw head and thrust ring; Screw head links to each other with the screw rod body by the low order end helicitic texture; The cylindrical external diameter of check ring internal diameter and screw head has constituted the runner of material, and external diameter then forms sealing with the internal diameter of barrel.The movement travel of check ring is limited by conical screw head and thrust ring, can only move between the screw head adverse current side end face and the thrust ring conical surface.When check ring is opened fully, melt is by the gap between thrust ring and barrel, enter in the storage compartment of screw head front end along the runner between check ring internal diameter and screw head cylinder and store, this moment, the check ring following current side conical surface and the screw head adverse current side conical surface were close to closure.When check ring was closed, the taper surface of the taper surface of check ring adverse current side and thrust ring following current side was close to closure, formed the backflow that sealing surface prevents melt.When check ring was positioned at the following current side, runner was open-minded; When being positioned at the adverse current side, the runner closing seam stops feed back.During plasticizing, the fused materials in the screw channel is fed forward pushes closed check ring open, opens runner, so that melt is smoothly by entering in the storage compartment; During injection, screw head travels forward, and check ring is subjected to the effect of material in the storage compartment and makes reverse movement backward, realizes closing seam up to contacting with the taper surface of thrust ring.
Cooperating between check ring external diameter and machine barrel internal diameter played important effect equally to the sealing of check ring.The gap of check ring external diameter and machine barrel internal diameter is very narrow and small, cooperates compact.When material plasticizing, producing frictional force between check ring and machine barrel under the material effect, it is as you were to attempt to make check ring to rest on.
The annular check ring uses permanent back to exist a very serious consequence to wear and tear exactly.Wearing and tearing mainly occur between check ring following current side and screw head adverse current face and check ring external diameter and the machine barrel internal diameter.During screw rod rotation plasticizing, be fed forward under the melt pressure effect, check ring following current side taper surface is pressed on the screw head taper surface, be subjected to the shear action of material simultaneously, produce relative velocity with screw head and machine barrel, cause to produce rubbing action between contact-making surface, and then cause contact surface abrasion.Wearing and tearing between screw head and check ring can cause the increase of the closed distance of check ring, cause the growth of closing time, the corresponding generation that increases the backflow situation; Wearing and tearing between check ring external diameter and machine barrel internal diameter have increased the gap between check ring and machine barrel, help the fast moving of check ring, but have increased the generation of leakage current situation simultaneously, and the stability of injection moulded products weight and the effect of sealing are affected.
The annular non-return screw head also exists because of non-alignment, particulate pollutant and exists not melt granules to make contact-making surface loose contact etc. cause problems such as serious leakage.
Summary of the invention
The object of the invention provides a kind of screw rod of the non-return screw head with sliding-type, and this screw rod overcomes the existing deficiency of the screw rod that has annular non-return screw head at present, and the precision of injection molded article is improved.
The present invention is a kind of screw rod of the non-return screw head with sliding-type.Main composition still is: screw head, check ring, thrust ring and screw rod body.The screw head main body is a circular cylinder, and the front portion of screw head is the conical head with certain angle, and the part that is connected with conical head is cylinder, and the end face of cylinder is the plane perpendicular to axis.It is characterized in that: screw head is cut fluted, has the thrust ring and the check ring that has dop and inward flange of step.
Check ring of the present invention is having the certain thickness flange near in the interior ring of following current side end face, and the flange outer sides face has certain chamfering, and flange is connected with fillet with certain gradient with the internal radius face, reduces the generation of the material situation phenomenon that stagnates.Between the internal diameter face of cylinder and the inward flange face and screw head cylinder of thrust ring step surface, check ring of non-return ring seal by check ring, the closed realization of slip of the middle discontinuity surface of check ring right side and thrust ring.Sealing between check ring external diameter and barrel then guarantees by the length of gap between them and check ring.The following current end face of check ring has two axially to protrude dop, and symmetric arrangement is stuck in the axial grooving of screw head, guarantees that check ring can run up with screw head one when material plasticizing, reduces the wearing and tearing between check ring following current side and screw head end face.During plasticizing, plastics promote check ring and travel forward, and check ring inward flange face forms runner corresponding to radial groove face on the cylinder between flange angled end-face and screw head cylinder, enter in the storage compartment by grooving after making material enter groove; During injection, screw rod moves axially forward, and the melt in the storage compartment promotes it and moves backward at the compressed check ring end face that reacts on simultaneously, when check ring inward flange and ring internal diameter contacts with screw head cylinder and thrust ring step surface respectively, and the realization close encapsulation.The end face of the end face of conical screw head and thrust ring radial flange has limited the shift motion of check ring.
The melt that screw rod is fed forward promotes check ring to the following current side shifting then through the gap between thrust ring flange outside diameter and barrel, opens runner material is therefrom passed through, and enters in the storage compartment then.The size in gap produces bigger influence to the inhibition of melt flow.Be the closure of sliding between check ring and thrust ring, do not have the long long face of rib, the pressure loss was less when material passed through.
Thrust ring step surface of the present invention removes, and reduces the melt flows resistance.
Thrust ring step surface of the present invention removes, and the inclined-plane of thrust ring is extended to form an inclined-plane.This structure, when check ring was opened, the resistance when material passes through the check ring runner reduced, and improved closed efficient of check ring and speed, reduced stagnant material, reduces material overheated phenomenon takes place.Behind the gap of material by thrust ring flange and barrel, promote check ring and move, directly enter runner then, enter in the storage compartment by radial and axial grooving to downbeam.Check ring to moving, when dome in the check ring contacts with screw head cylinder face, is realized sealing completely to adverse current during injection.
A kind of non-return screw head of the present invention with sliding-type, closing speed was fast when advantage was exactly screw of injection, and is good to neutrality, and sealing is reliable, and the measuring accuracy height has certain immixture simultaneously.
Description of drawings
In order to deepen that further understanding of the present invention is enclosed various figure and cooperated explanation.Below be various accompanying drawings:
The screw rod of Fig. 1 band shape non-return screw head;
The exploded view of Fig. 2 screw rod of the present invention;
The profile of Fig. 3 screw rod of the present invention, check ring is in the close position;
The profile of Fig. 4 screw rod of the present invention, check ring is shown in an open position;
The screw head view of Fig. 5 screw rod of the present invention;
Fig. 6 check ring view;
Fig. 7 thrust ring cutaway view
The cutaway view of the thrust ring that Fig. 8 obtains after the step of Fig. 7 thrust ring is removed,
Fig. 9 includes the screw rod cutaway view of thrust ring shown in Figure 8;
Among the figure: 1-screw head, 2-check ring, 3-thrust ring, 4-screw rod body, 5-conical head, 6-runner, 7-conical head end face, 8-cylinder, 9-groove, the 10-face, the first end face of 11-screw rod, 12-screw thread, 13-locatees cylinder, 14-dop, 15-inclination angle, inclined-plane in the 16-flange surface, 17-flange, the 18-inner ring surface, 19-check ring right side, inclined-plane in the 20-inlet, 21-outer ring surface, 22-thrust ring cylinder, 23-thrust ring left side, 24-locatees inner ring surface, the inclined-plane of 25-thrust ring, 26-thrust ring step surface, the middle end face of 27-thrust ring, 28-thrust ring flange, 29-thrust ring right side
The specific embodiment
The non-return screw head of screw rod of the present invention is a kind of sliding-type non-return screw head, and screw rod mainly is made up of four parts, as shown in Figure 2, is respectively screw head 1, check ring 2, thrust ring 3 and screw rod body 4.During combination, check ring 2 is positioned between screw head 1 and the thrust ring 3, screw thread 12 on the screw head is connected with the internal thread of screw rod body 4 left ends, screw head is by the fixed dignity realization location of location cylinder 13 with screw rod body 4 internal thread left ends, combined situation is positioned in the injecting machine material tube as shown in Figure 3 and Figure 4 then.The structure of screw head 1 mainly is made up of conical head 5, cylinder 8, location cylinder 13 and connecting thread 12 etc. as shown in Figure 5.On conical head 5, offer four axial runners 6.Cylinder 8 as the runner of melt and with the face that is sealed and matched of check ring.Between cylinder 8 and conical head end face 7, radially cut fluted 9, the feed well that leads to runner 6 and conical head 5 front end storage compartments as melt, and in plasticizing process, material is played further immixture.
The structure of check ring as shown in Figure 6.It is different from traditional check ring, at the internal diameter of check ring one flange surface 16 is arranged, when check ring is closed, and flange surface 16 and the screw head cylinder 8 closed sealing surfaces that form; Inner ring surface 18 and the thrust ring step surface 26 closed sealing surfaces that form.Check ring outer ring surface 21 cooperates the sealing that forms the check ring outer ring surface with the inner ring surface of barrel.Two dops 14 are arranged on end face, put it into during assembling in the screw head runner 6.When material plasticizing, check ring under the effect of dop 14 along with screw rod rotates together.Place, the interior ring following current side end face of check ring is provided with certain inclination angle 15, so that feed back enters groove 9 during injection, plays the effect of buffering.The outer inclined-plane 17 of flange is structurally parallel with the face 10 on the screw head 1, reduces stagnate material and resistance.The small inclined-plane 20 that is arranged, entrance face place, parallel with thrust ring inclined-plane 25, the resistance when reducing melt flows.
The main effect of thrust ring is exactly the shift motion that limits check ring, and structure as shown in Figure 7.During installation, the first end face 11 of screw rod is close in thrust ring left side 23, and inner ring surface 24 location cylinders 13 in location cooperate, and guarantee that thrust ring cylinder 22 is concordant with screw head cylinder 8.Screw rod body left side is close in thrust ring right side 29.During plasticizing, melt is pushed check ring open by the gap between thrust ring flange 28 and the barrel, enters into by runner 6 and stores melt in the storage compartment.During injection, inner ring surface 18 closing seams of thrust ring step surface 26 and check ring prevent the backflow and the leakage current of melt, and middle the end face 27 of thrust ring is pressed in check ring right side 19, prevent axial mobile of check ring.
In the injection mo(u)lding, influence the check ring motion and mainly contain three processes: plasticizing, screw rod are penetrated and are moved back and inject.After a shot was intact, screw rod and non-return screw head were positioned at barrel foremost, do not have unnecessary melt in the storage compartment, and this moment, check ring was in the adverse current position, i.e. closure state, as shown in Figure 3.During plasticizing, non-return screw head is along with screw rod rotates together, the material that plasticizing is good is fed forward by the gap between thrust ring flange 28 and barrel from the screw rod end, coated by melt around the check ring right side 19 at this moment, under the effect of material, check ring is to the following current side shifting, the runner that the passage of melt by inlet inclined-plane 20 and thrust ring inclined-plane 25, check ring inner ring surface 18 and screw head cylinder face are 8, enter into grooving 9, enter in the storage compartment of screw head front end by conical head upper runner 6 respectively then.Check ring continues to the following current side shifting, and its shift motion is subjected to 7 restrictions of conical head end face, and is last under the effect of melt pressure, and check ring following current side end face is pressed end face 7 and rotated with screw rod, and structure as shown in Figure 4.When the melt in the storage compartment reaches a certain amount of, overcome back pressure, lead-screw moves backward, increases the melt in the storage compartment, and when the material of getting well when plasticizing reached required amount, screw rod just stopped the rotation.
The deactuate of penetrating of screw rod occurs in after the plasticizing end, and when plasticizing finished, screw rod stopped the rotation, and apply a buffer brake to screw rod this moment, and screw rod just moves certain distance backward.Can reduce the pressure of melt in the storage compartment like this, thereby reduce the generation of feed back and leakage current situation.
During injection, screw rod and screw head move forward, and the melt in the compression storage compartment enters into the in-mold molding goods.In this compression process, melt pressure in the storage compartment increases, feed back, coating a large amount of materials around the check ring following current side end face, under the effect of material pressure, check ring moves to the adverse current side direction, seals with cylinder face 8 and step surface 26 closed realizations respectively up to check ring inner ring surface 18 and flange 16, press end face 27 and check ring right side 19 in the middle of the thrust ring, stops moving axially of thrust ring.Check ring following current side end face area is big, and corresponding melt active force is big, and the seal closure action response is fast.In injection process, melt longshore current road 6 in the storage compartment refluxes, when touching the check ring end face, the melt backflow will enter in the groove 9 on 15 inclined-planes that form along the inclination angle, the material of runner 6 bottoms then directly enters in the groove, the melt that enters in the groove has an effect of circling round when running into face 10, weaken the backflow effect of melt.After having injected, the state of check ring as shown in Figure 3.
Thrust ring shown in Figure 7 is bigger to the resistance of closed efficient of check ring and melt flows, and the structure of thrust ring also can be a structure shown in Figure 8.The inward flange face 16 of non-return ring seal by check ring and the closed realization of slip of middle the end face 27 of screw head cylinder 8, check ring right side 19 and thrust ring.Thrust ring step surface 26 removes, and the inclined-plane 25 of thrust ring is extended to form a long inclined-plane, and all the other structures do not change.During injection, the configuration state of screw rod as shown in Figure 9.
The above is several concrete situation of the present invention, cooperates various figure to be illustrated.But the present invention is not limited to the above several situations and figure, and is any based on above-mentioned said modification to part, replaces, as long as in realm of spirit scope of the present invention, all belongs to the present invention.
Verified the high-performance of novel injection screw by the repeating weight precision contrast experiment.The contrast experiment has carried out the experiment of repeating weight precision to injection screw of the present invention and traditional injection moulding screw rod, and screw diameter is 45mm, and goods are the standard batten.The repeating weight precision that the injector that injection screw of the present invention is housed makes the standard sample bar reaches 0.49 ‰, and the injector that the traditional injection moulding screw rod is housed makes the repeating weight precision of standard sample bar is 1.14 ‰, and the stability of injector at aspects such as injection, backing straps that injection screw of the present invention is housed all is higher than the injector that the traditional injection moulding screw rod is housed.
Claims (3)
1, a kind of jetting-moulding screw of plastic jetting-moulding machine is made up of screw head, check ring, thrust ring and screw rod body; Check ring and thrust ring place between screw head and the screw rod body, screw head, thrust ring are fixedlyed connected with the screw rod body, check ring slides between screw head and thrust ring, it is characterized in that: cut fluted on the screw head, the following current end face of check ring is provided with dop, check ring is having the certain thickness flange near in the interior ring of following current side end face, and thrust ring has step; Thrust ring is realized fixing by the end face of first end face of screw rod and screw rod body, realize the location by screw head location cylinder, and thrust ring has step surface, inclined-plane, middle end face and flange, middle end face restriction check ring shift motion; The check ring inner ring surface has flange surface, the flange surface both sides are the inclined-plane, interior ring following current side end face is provided with chamfering, the check ring dop is stuck in the axial groove of screw head, the check ring outer ring surface places in the barrel and cooperates realization closed with the barrel inner ring surface, radially cut fluted between the conical head end face of screw head and the cylinder of screw head, during plasticizing, check ring inward flange face is corresponding to radial groove face on the cylinder, non-return ring seal by check ring the internal diameter face of cylinder and the inward flange face of thrust ring step surface, check ring and the slip between the screw head cylinder is closed realizes.
2, jetting-moulding screw of plastic jetting-moulding machine according to claim 1 is characterized in that: the thrust ring step surface removes.
3, jetting-moulding screw of plastic jetting-moulding machine according to claim 1 is characterized in that: the thrust ring step surface removes, and the inclined-plane of thrust ring is extended to form a long inclined-plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710100143XA CN100562422C (en) | 2007-06-05 | 2007-06-05 | A kind of jetting-moulding screw of plastic jetting-moulding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710100143XA CN100562422C (en) | 2007-06-05 | 2007-06-05 | A kind of jetting-moulding screw of plastic jetting-moulding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101318372A CN101318372A (en) | 2008-12-10 |
| CN100562422C true CN100562422C (en) | 2009-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710100143XA Expired - Fee Related CN100562422C (en) | 2007-06-05 | 2007-06-05 | A kind of jetting-moulding screw of plastic jetting-moulding machine |
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| CN (1) | CN100562422C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973112A (en) * | 2010-09-30 | 2011-02-16 | 北京化工大学 | Threaded rod of injection molding machine with reversely connected threaded rod head |
| CN102922655B (en) * | 2012-11-08 | 2015-04-29 | 广西柳州中嘉知识产权服务有限公司 | Injection molding machine for unsaturated polyester bulk molding compound |
| CN107877805A (en) * | 2017-10-24 | 2018-04-06 | 佛山市三水兴达涂料有限公司 | A kind of composite environment friendly decorative material processing unit (plant) and processing method |
| CN107672117A (en) * | 2017-11-06 | 2018-02-09 | 威塑机械科技（上海）有限公司 | Injection machine and former |
| CN111645283A (en) * | 2019-03-04 | 2020-09-11 | 富泰华工业（深圳）有限公司 | Injection molding apparatus and injection molding method |
| CN112917821A (en) * | 2021-01-21 | 2021-06-08 | 西诺控股集团有限公司 | High-speed low-inertia structure applied to injection molding machine and injection molding machine with structure |
| CN113799346A (en) * | 2021-08-04 | 2021-12-17 | 昆山又二贝精密机械有限公司 | Check type screw head assembly design and production process |
| CN116586583B (en) * | 2023-05-29 | 2024-03-12 | 伯乐智能装备股份有限公司 | Integrated semi-solid forming process and equipment for continuously preparing magnesium-based composite material |
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2007
- 2007-06-05 CN CNB200710100143XA patent/CN100562422C/en not_active Expired - Fee Related
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| CN101318372A (en) | 2008-12-10 |
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Assignee: Zhejiang Dongbin Rubber Machinery Screw Co., Ltd. Assignor: Beijing University of Chemical Technology Contract record no.: 2010330001884 Denomination of invention: Jetting-moulding screw of plastic jetting-moulding machine Granted publication date: 20091125 License type: Exclusive License Open date: 20081210 Record date: 20100917 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091125 Termination date: 20200605 |
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| CF01 | Termination of patent right due to non-payment of annual fee |