CN109397652A

CN109397652A - A kind of sandwich injection device of single screw rod and technique

Info

Publication number: CN109397652A
Application number: CN201811300407.0A
Authority: CN
Inventors: 杨军兵
Original assignee: ZHEJIANG ZHONGYANG SCREW MANUFACTURING Co Ltd
Current assignee: ZHEJIANG ZHONGYANG SCREW MANUFACTURING Co Ltd
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2019-03-01

Abstract

The invention discloses a kind of sandwich injection device of single screw rod and techniques, including barrel and screw rod assembly, main blanking port and secondary blanking port are offered on barrel, screw rod assembly includes screw head, non-return circle, washer, shuttle valve, screw body, screw rod cephalic par in non-return circle side circumferentially offers several outer flow passages, offers and communicates with outer flow passage and the inner hole opposite with washer on non-return circle；Screw body successively includes main plasticizing thread segment, main blanking section, distance piece, secondary plasticizing thread segment, secondary blanking section, the inner flow passage for sequentially passing through screw body and screw head is offered along main blanking section direction in distance piece, inclination offers the mistake material mouth communicated with inner flow passage on distance piece, screw rod cephalic par and main plasticizing thread segment end offer the sliding room of shuttle slided inside for shuttle valve to realize inner flow passage opening and closing jointly, its key points of the technical solution are that, the production that sandwich product is realized by single screw rod running guarantees the quality of sandwich product while reducing sandwich injection cost.

Description

A kind of sandwich injection device of single screw rod and technique

Technical field

The present invention relates to injection moldings to be plasticized equipment, the in particular to sandwich injection device of a kind of single screw rod and technique.

Background technique

Existing sandwich injection needs two plasticizing systems that could complete, and main purpose is the new packet for reaching injection-molded item It is old, it realizes the reuse of recycled plastic, improves resource utilization.It, can in the case where not influencing the surface quality of plastic products The manufacturing cost of injection molding producer is greatlyd save, market prospects are very wide.

But the setting of two plasticizing systems, on the one hand itself manufacture is complicated, can be because difficulty of processing leads to greatly cost pole Height, and outer dimension has greatly certain requirement to occupied area；Still further aspect, sandwich injection have the synchronism of two kinds of raw materials Certain requirement, but two plasticizing systems are in separated state, to accomplish that certain injection synchronism is more difficult, to guarantee folder The heart injects the quality of finished product, will increase the difficulty that sandwich injection is completed in the synchronous injection of two plasticizing systems.

Summary of the invention

In view of the deficiencies of the prior art, the present invention intends to provide a kind of sandwich injection device of single screw rod and work Skill realizes the production of sandwich product by single screw rod running, guarantees the quality of sandwich product while reducing sandwich injection cost.

Above-mentioned technical purpose of the invention has the technical scheme that

A kind of sandwich injection device of single screw rod, the screw rod assembly operated including hollow barrel and in barrel, the material Main blanking port and secondary blanking port are offered on cylinder, the screw rod assembly includes screw head, non-return circle, washer, shuttle valve, screw rod sheet Body, the non-return circle and the washer are successively socketed on screw head, and the outer circle and barrel inner body wall of washer have melting modeling Expect the gap passed through enough, the screw rod cephalic par in non-return circle side circumferentially offers several outer flow passages, the non-return circle On offer and communicated with outer flow passage and the inner hole opposite with washer, the screw rod cephalic par in washer side is concentric and screw rod Ontology screw thread closely connects；

The screw body successively includes main plasticizing thread segment, main blanking section, distance piece, secondary plasticizing thread segment, secondary blanking Section, the main plasticizing thread segment are located at screw head side, and the secondary plasticizing thread segment end offers successively along distance piece direction Through the inner flow passage of screw body and screw head, and inner flow passage and the concentric setting of screw head, the pair are plasticized thread segment end Inclination offers the mistake material mouth communicated with inner flow passage, the spiral shell angularity phase on the main plasticizing thread segment and secondary plasticizing thread segment With and with cross, material mouth tilt angle is identical, and the screw rod cephalic par and main plasticizing thread segment end are offered jointly for shuttle valve The sliding room of shuttle to realize inner flow passage opening and closing is slided inside.

So set, open up main blanking port and secondary blanking port by barrel, respectively correspond screw body main blanking section and Screw body is divided into the respective blanking in two sections of front and back by secondary blanking section, outer flowed to, is opened inside screw body with close on screw head If inner flow passage, form the output channels of two different plastics of conveying, outer flow passage and inner flow passage are eventually in screw rod cephalic par shape At confluence, sandwich injection is synchronized, whole process only passes through a screw body and realizes sandwich injection, avoids two modelings of setting Change system guarantees the quality of sandwich product while reducing sandwich injection cost.

Further preferably are as follows: slideway is circumferentially symmetrically offered on the screw head, described non-return circle one end is provided with The shoes slided in slideway, the non-return circle other end are provided with the bucking ladder flowed down convenient for molten plastic, and washer is opened accordingly Equipped with the dovetail groove matched with bucking ladder.

So set, by the mating setting of slideway and shoes mating setting and bucking ladder and dovetail groove, so that non-return circle During sliding, play the role of limit, it is therefore prevented that the rotation of non-return circle misplaces so that the inner hole in non-return circle always with Outer flow passage is opposite, enables outer flow passage to receive the molten plastic of main blanking section always, can guarantee to a certain extent The quality of sandwich injection product.

Further preferably are as follows: the sliding room of the shuttle is provided with shuttle valve sheath in screw head one end, and the sliding room other end of the shuttle is set It is equipped with sealing inner ring, the shuttle valve both ends, which are respectively arranged with, to match with shuttle valve sheath and sealing inner ring for playing sealing function Protection ring and sealing ring.

Further preferably are as follows: the protection ring and sealing ring be in be obliquely installed to its axle center and inclined direction on the contrary, The slanted angle of the sealing ring is between 45 ° and 60 °.

It is a further object of the present invention to provide the sandwich injection moulding works that the sandwich injection device of above-mentioned single screw rod accordingly generates Skill.

A kind of sandwich injection molding technique of single screw rod, be divided by screw body the main plasticizing thread segment that is spaced apart and Pair is plasticized thread segment, outer flow passage and main plasticizing thread segment cooperation outflow molten plastic is opened up on screw head, in screw body and spiral shell Head axle center opens up the inner flow passage matched from secondary plasticizing thread segment and flows out different molten plastics, and final two kinds of plastics are in screw rod Cephalic par, which converges, completes sandwich injection.

In conclusion the present invention having the beneficial effect that in contrast to the prior art

1, center-filled product is produced for injection, avoided using two plasticizing systems, it is only total by a barrel and screw rod At cooperation realize sandwich injection, it is easy to operate and substantially reduce the use costs such as the land occupation of sandwich injection；

2, now there are two the settings of plasticizing system, are guaranteeing that the synchronous injection of two kinds of molten plastics is upper relatively difficult, no matter right The ability requirement all with higher of the precision and operator of plasticizing equipment, present invention setting barrel and single screw rod assembly It matches, by the outer flow passage and internal inner flow passage formation molten plastic dual channel outside screw rod assembly, can be improved folder The synchronism of heart injection, that is, guarantee the quality of center-filled product.

Detailed description of the invention

Fig. 1 is the structural schematic diagram for implementing screw rod assembly in 1；

Fig. 2 is the partial structure diagram of screw head one end in 1 Fig. 1 of embodiment；

Fig. 3 is the cross-sectional view of 1 Fig. 2 of embodiment；

Fig. 4 is the partial sectional view of screw head and the side view of screw head in embodiment 1；

Fig. 5 is the cross-sectional view that embodiment 1 is screw body；

Fig. 6 is the partial structure diagram of 1 Fig. 5 of embodiment；

Fig. 7 is the structural schematic diagram of 1 shuttle valve of embodiment；

Fig. 8 is the screw rod preformed status diagram of embodiment 1；

Fig. 9 is the partial structure diagram of 1 Fig. 8 of embodiment；

Figure 10 is the screw of injection status diagram of embodiment.

Appended drawing reference: 1, screw rod assembly；2, barrel；21, main blanking port；22, secondary blanking port；3, screw head；31, head； 32, cylindrical section A；33, cylindrical section B；34, cylindrical section C；35, cylindrical section D；36, outer flow passage；37, inner flow passage；38, slideway；4, only Inverse circle；41, shoes；42, bucking ladder；5, washer；51, dovetail groove；6, shuttle valve；61, built-in runner；62, protection ring；63, it seals Ring；7, screw body；71, main plasticizing thread segment；72, main blanking section；73, distance piece；74, secondary plasticizing thread segment；75, secondary blanking Section；8, material mouth is crossed；9, the sliding room of shuttle；10, shuttle valve sheath；11, inner ring is sealed；12, link slot.

Specific embodiment

Below in conjunction with attached drawing, invention is further described in detail.

Embodiment 1:

A kind of sandwich injection device of single screw rod, it is shown referring to Figures 1 and 2, including hollow barrel 2 (see Fig. 7) and expecting The screw rod assembly 1 operated in cylinder 2, screw rod assembly 1 includes screw head 3, non-return circle 4, washer 5, shuttle valve 6, screw body 7, non-return Circle 4 and washer 5 are socketed on screw head 3, and screw head 3 is threadedly coupled with screw body 7.

Referring to shown in Fig. 4, screw head 3 successively includes head 31 in a circular table shape, concentric and successively radius reduction circle Shell of column A32, cylindrical section B33, cylindrical section C34, cylindrical section D35, cylindrical section A32 and the concentric setting in head 31, and cylindrical section A32 radius is identical as the larger-diameter end radius in head 31.

Referring to shown in Fig. 2, the inner ring of non-return circle 4 is slidably socketed on cylindrical section B33, can be slided on cylindrical section B33, The outer ring of non-return circle 4 abuts with the inner wall of barrel 2 and has certain gap, this gap is sufficiently small, so that molten plastic is not It can pass through, but not influence the rotation and reciprocating movement of screw head 3 and screw body 7.

Referring to shown in Fig. 3, the inner ring of washer 5 is socketed on cylindrical section C34 and is in the state pushed against with cylindrical section C34, 5 part of washer is located on cylindrical section D35, and the outer radii of washer 5 is smaller than 2 inner radii of barrel, i.e. the outer ring of washer 5 and barrel 2 inner walls have certain spacing, and the enough molten plastics of this spacing pass through.Important is when non-return circle 4 and cylindrical section A32 is pushed against Later, there is certain spacing between non-return circle 4 and washer 5, and is provided with and is convenient in 4 end of non-return circle of 5 side of washer The bucking ladder 42 that molten plastic flows down, bucking ladder 42 be in it is inclined round table-like to middle part, a part of bucking ladder 42 is in cylindrical section B33 Upper, a part is within the scope of cylindrical section C34, and washer 5 offers the dovetail groove 51 matched with bucking ladder 42 accordingly, when trapezoidal After platform 42 and dovetail groove 51 push against, non-return circle 4 and cylindrical section A32 has certain spacing.

Referring to shown in Fig. 2 and Fig. 3, the cunning extended in the axial direction is offered in the end cylindrical section A32 of 4 sides of non-return circle Road 38, slideway 38 are provided in the outer circle of cylindrical section A32, and slideway 38 does not run through the other end of cylindrical section A32, and cylindrical section For A32 along its circumferential spaced set there are four slideway 38,38 quantity of slideway is not limited to four, and non-return circle 4 is in cylindrical section A32 mono- The end of side is provided with the shoes 41 matched with slideway 38, and shoes 41 can be sliding along cylindrical section A32 axis direction in slideway 38 It is dynamic.

Several outflows are circumferentially offered in 3 end of screw head (head 31 and cylindrical section A32 two parts) of 4 sides of non-return circle Road 36, outer flow passage 36 and slideway 38 are arranged in a staggered manner, and in this embodiment, there are four the settings of outer flow passage 36, and four outer flow passages 36 are circumferential Spaced set, it is non-return to enclose several inner hole (not shown)s offered in 4 through both ends, several inner holes and several outer flow passages 36 communicate respectively, i.e., when non-return circle 4 and cylindrical section A32 is pushed against, molten plastic is entered between cylindrical section A32 and washer 5, then Non-return circle 4 inner holes, outer flow passage 36 are sequentially entered, realize that a kind of molten plastic enters 3 front end of screw head.

Referring to figure 5 and figure 6 shown in, screw body 7 successively include main plasticizing thread segment 71, main blanking section 72, distance piece 73, Pair plasticizing thread segment 74, secondary blanking section 75, each section integrated molding of screw body 7, main 71 one end of plasticizing thread segment and master Blanking section 72 is connected, and the other end is threadedly coupled with the cylindrical section D35 of screw head 3, i.e., main 71 end of plasticizing thread segment opens up useful In the link slot 12 of cylindrical section D35 insertion, and link slot 12 is circumferentially provided with internal screw thread, is provided in cylindrical section D35 outer circle The external screw thread matched with internal screw thread, and the master opposite with main blanking section 72 and secondary blanking section 75 is offered on barrel 2 respectively Blanking port 21 and secondary blanking port 22.

Wherein, the interior stream for sequentially passing through screw body 7 and screw head 3 is offered along main 72 direction of blanking section in distance piece 73 Road 37, inner flow passage 37 are in cylindrical type, and with screw head 3 and the concentric setting of screw body 7,73 surface of distance piece is toward axle center side The mistake material mouth 8 communicated with inner flow passage 37 is offered to inclination.Important is on main plasticizing thread segment 71 and secondary plasticizing thread segment 74 Spiral shell angularity it is identical and with cross 8 tilt angle of material mouth it is identical, be β.

3 end of screw head and main 71 end of plasticizing thread segment offer jointly to be slided inside to realize interior stream for shuttle valve 6 The sliding room 9 of the shuttle that road 37 opens and closes, the cavity being provided in screw head 3 are the sloped-end part of the sliding room 9 of shuttle, the sliding room 9 of shuttle with Link slot 12 and inner flow passage 37 is concentric opens up, and the sliding room 9 of shuttle is communicated with link slot 12 and inner flow passage 37, the sliding room 9 of shuttle Diameter is smaller than the diameter of link slot 12；It is worth noting that the sliding room 9 of shuttle is on inner flow passage 37, i.e., inner flow passage 37 is divided into Two sections.

The sliding room 9 of shuttle is provided with 6 sheath of shuttle valve (see Fig. 4) in 3 one end of screw head, and sliding 9 other end of room of shuttle is provided in sealing Ring 11 (see Fig. 6), 6 sheath of shuttle valve and sealing inner ring 11 are separately mounted on screw head 3 and main plasticizing thread segment 71；Meanwhile joining Match with 6 sheath of shuttle valve and sealing inner ring 11 for playing sealing function according to shown in Fig. 7,6 both ends of shuttle valve are respectively arranged with Protection ring 62 and sealing ring 63, protection ring 62 and sealing ring 63 to its axle center in being obliquely installed, and protection ring 62 and sealing The inclined direction of ring 63 is on the contrary, from figure 7 it can be seen that protection ring 62 and sealing ring 63 are in the heeling condition outwardly protruded, thus 6 sheath of shuttle valve and sealing inner ring 11 are tilted to screw head 3 and main 71 sunken inside of plasticizing thread segment respectively, referring to Fig. 4 and Fig. 7, shuttle 6 sheath of valve is identical with the slanted angle of protection ring 62, i.e., the angle theta in figure, and the slanted angle of sealing ring 63 be located at 45 ° and Angle α between 60 °, i.e. in Fig. 7.

Working principle:

In the sandwich injection device work preformed of single screw rod, referring to the preformed status diagram of Fig. 8 and Fig. 9, different plastics Particle enters the major and minor blanking section 75 of screw body 7 from the major and minor blanking port 22 of barrel 2 respectively, and screw body 7 passes through oily horse Reach or motor driven and rotate, major and minor plasticizing thread segment 74 is plasticized plastics respectively, due to major and minor plasticizing thread segment 74 The effect of shearing and the heating of external heater, grain plastic are gradually melted into molten plastic in major and minor plasticizing thread segment 74 respectively, And in 7 spiral conveying action of screw body, plastics are conveyed from major and minor 74 rear end of plasticizing thread segment toward leading portion respectively.

For the grain plastic entered from main blanking port 21, the molten plastic in main plasticizing thread segment 71 passes through forward washer 5 outer circles push non-return circle 4 to be moved along, so that non-return circle 4 and cylindrical section A32 is pushed against, molten plastic are made to pass through non-return circle 4 Inner hole enters the outer flow passage 36 of screw head 3,2 front end of feeding cylinder of going forward side by side, and realizes the injection of single plastics.

Due to the buffer action of distance piece 73 on screw body 7, winner is made to be plasticized thread segment 71 and secondary plasticizing thread segment 74 Molten plastic will not mix, pair plasticizing thread segment 74 in molten plastic can enter in material mouth 8, enter back into inner flow passage 37, and shuttle valve 6 is pushed to be moved along, the protection ring 62 of shuttle valve 6 is touched with the protection of shuttle valve 6 of screw head 3, and molten plastic is from shuttle valve Built-in runner 61 on 6 enters in the inner flow passage 37 of 3 part of screw head, equally also enters 2 front end of barrel, completes second The injection of plastics.

Since preformed acts on, screw body 7 is retreated, 2 front end storing of barrel, and two kinds of molten plastics reach barrel 2 simultaneously Front end, therefore by main plasticizing thread segment 71 in outside, and two kinds of modelings are completed in inside by the secondary plastics for being plasticized thread segment 74 The sandwich injection of material.

When preformed finishes, into injection state when, 0 injection status diagram, screw body 7 pass through oil cylinder referring to Fig.1 Or motor driving, push plastics to be moved along, due to reaction force, plastics push non-return circle 4 and shuttle valve 6 to move backward, non-return The bucking ladder 42 of circle 4 touch the dovetail groove 51 of washer 5, because tilt angle is completely the same, and non-return circle 4 and 2 gap of barrel foot It is enough small, therefore plastics are prevented from shrinking back；

The 63 gluing, sealing inner ring 11 of sealing ring of shuttle valve 6 simultaneously, since the two angle is completely the same, same plastics retreat logical Road is cut off.To which under screw rod thrust, two kinds of molten plastics keep inside and outside inclusion state, releases barrel 2 and enter mold It is interior, to realize the production of plastic sandwiched product.

Embodiment 2:

The sandwich injection device researched and developed and gone out according to embodiment 1, matching provide a kind of sandwich injection molding technique of single screw rod, It is divided into the main plasticizing thread segment 71 being spaced apart and secondary plasticizing thread segment 74 by screw body 7, opens up outer flow passage on screw head 3 36 flow out molten plastic with the cooperation of main plasticizing thread segment 71, open up and secondary plasticizing thread segment in screw body 7 and 3 axle center of screw head 74 inner flow passages 37 matched flow out different molten plastics, and final two kinds of plastics converge in 3 end of screw head completes sandwich note It penetrates.

The above is only exemplary embodiment of the invention, protection scope and is not intended to limit the present invention, this hair Bright protection scope is determined by the attached claims.

Claims

1. a kind of sandwich injection device of single screw rod, including hollow barrel (2) and the screw rod assembly (1) operated in barrel (2), Main blanking port (21) and secondary blanking port (22) are offered on the barrel (2), it is characterized in that: the screw rod assembly (1) includes spiral shell Head (3), non-return circle (4), washer (5), shuttle valve (6), screw body (7), the non-return circle (4) and the washer (5) are successively It is socketed on screw head (3), the gap that there is the outer circle and barrel (2) inner body wall of washer (5) molten plastic to pass through enough, The screw head (3) end of non-return circle (4) side circumferentially offers several outer flow passages (36), opens up on the non-return circle (4) Have and is communicated with outer flow passage (36) and the inner hole opposite with washer (5), the screw head (3) end in washer (5) side are coaxial The heart is closely connect with screw body (7) screw thread；

The screw body (7) successively includes main plasticizing thread segment (71), main blanking section (72), distance piece (73), secondary plasticizing spiral shell Line section (74), secondary blanking section (75), the main plasticizing thread segment (71) are located at screw head (3) side, the secondary plasticizing thread segment (74) end offers the inner flow passage (37) for sequentially passing through screw body (7) and screw head (3) along distance piece (73) direction, and interior Runner (37) and screw head (3) concentric setting, described secondary plasticizing thread segment (74) sloped-end offer and inner flow passage (37) The mistake material mouth (8) communicated, main plasticizing thread segment (71) and the secondary spiral shell angularity being plasticized on thread segment (74) it is identical and with mistake Material mouth (8) tilt angle is identical, and screw head (3) end and main plasticizing thread segment (71) end are offered jointly for shuttle valve (6) sliding is sliding room (9) with the shuttle for realizing inner flow passage (37) opening and closing inside.

2. the sandwich injection device of a kind of single screw rod according to claim 1, it is characterized in that: along week on the screw head (3) To symmetrically offering slideway (38), described non-return circle (4) one end is provided with the shoes (41) slided in slideway (38), described to stop Inverse circle (4) other end is provided with the bucking ladder (42) flowed down convenient for molten plastic, and washer (5) offers accordingly and bucking ladder (42) dovetail groove (51) matched.

3. the sandwich injection device of a kind of single screw rod according to claim 1 or 2, it is characterized in that: the shuttle sliding room (9) is in spiral shell Head (3) one end is provided with shuttle valve (6) sheath, and sliding room (9) other end of the shuttle is provided with sealing inner ring (11), the shuttle valve (6) both ends are respectively arranged with the protection ring to match with shuttle valve (6) sheath and sealing inner ring (11) for playing sealing function (62) and sealing ring (63).

4. the sandwich injection device of a kind of single screw rod according to claim 3, it is characterized in that: the protection ring (62) and sealing Ring (63) in be obliquely installed to its axle center and inclined direction on the contrary, the sealing ring (63) slanted angle be located at 45 ° and Between 60 °.

5. according to claim 1 to a kind of sandwich injection technique of the sandwich injection device of single screw rod described in 4 any one, feature It is: is divided into the main plasticizing thread segment (71) being spaced apart and secondary plasticizing thread segment (74), screw head (3) by screw body (7) On open up outer flow passage (36) and main plasticizing thread segment (71) cooperation flow out molten plastic, in screw body (7) and screw head (3) axis The heart the is opened up molten plastic different from inner flow passage (37) outflow that secondary plasticizing thread segment (74) matches, final two kinds of plastics are in spiral shell Head (3) end, which is converged, completes sandwich injection.