CN113733522A

CN113733522A - Stretching mechanism of plastic bottle blank for plastic bottle injection mold

Info

Publication number: CN113733522A
Application number: CN202111185706.6A
Authority: CN
Inventors: 李泰然
Original assignee: Individual
Current assignee: Shandong Zhenxing Plastic Co ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2021-12-03
Anticipated expiration: 2041-10-12
Also published as: CN113733522B

Abstract

The invention discloses a stretching mechanism of a plastic bottle blank for a plastic bottle injection mold, which relates to the technical field of molds and comprises a blow mold, a supporting block and a clamping block, wherein the blow mold comprises a mold body and a cavity arranged on the side wall of the mold body, the inner wall of the clamping block is provided with a stretching mechanism, the lower part of the clamping block is provided with a supporting mechanism on the top end of the supporting block, and the side wall of the mold body is provided with an auxiliary blanking mechanism below the cavity. The plastic bottle injection mold effectively solves the problem that the bottom end of a bottle blank is easy to damage due to the fact that the top stretching action area of a stretching pipe is small in the plastic bottle injection mold through the stretching mechanism, the transmission mechanism and the driving mechanism, and effectively solves the technical problem that material center accumulation in a collecting box is easy to cause during mold discharging through the supporting mechanism and the auxiliary discharging mechanism.

Description

Stretching mechanism of plastic bottle blank for plastic bottle injection mold

Technical Field

The invention relates to the technical field of molds, in particular to a stretching mechanism of a plastic bottle blank for a plastic bottle injection mold.

Background

In the manufacturing process of the plastic bottle, the thermoplastic resin is required to be melted at 228 ℃, then the first blow molding is carried out through a mold, so as to obtain a tubular bottle blank, a support ring is arranged at the upper port of the bottle blank, threads are formed at the upper port, when the bottle blank is required to be blown, the bottle blank is required to be heated by 118 ℃, at the moment, the bottle body is softened and has the deformation capacity, then the bottle blank is placed in a split mold, the support function in the blow molding process is achieved through the limiting function of the support ring and the mold, the top end of the bottle blank is stretched to the bottom end of a mold cavity through a stretching pipe after the mold is closed, then low-pressure air is blended, so that the bottle blank is expanded firstly, then high-pressure air is introduced, the bottle blank is immediately expanded to be tightly attached to the inner wall of the mold, and because cooling liquid circulates in the inner wall of the mold, the outer wall of the plastic bottle is cooled and demolded after being contacted with the inner wall of the mold, a plastic bottle with a cavity is obtained.

In the prior art, a stretching pipe is required in the process of stretching a bottle blank, the stretching pipe is generally made of metal, the interior of the stretching pipe is hollow, and the stretching pipe is connected with an external air supply system through an air inlet, so that the blow molding function of the bottle blank can be realized, but the bottom end of the bottle blank is easily damaged due to the fact that the stretching pipe is only supported by an outer ring at the bottom end of the stretching pipe, the stress area is small, and high reject ratio is caused; meanwhile, the stretching pipe is used for stretching the bottle blank at the top and simultaneously considering the subsequent blow molding process, so that the stretching pipe needs to move for a certain distance in a return stroke after the bottle blank is stretched to a certain position, the flowing-out of the internal gas is facilitated, a complex control system needs to be designed to control the stretching pipe in the process, the stretching time cannot be specified according to the situation, otherwise, due to the toughness of the bottle blank, the stretching part of the bottle blank rebounds, and the product reject ratio is further improved; secondly, the bottle blank is supported by the support ring in the blow molding process, although the hardness of the support ring can support the bottle blank to be blow molded, the situation that the support ring is broken is inevitable, and improvement is needed; finally, the unloading mode of this mould of plastic bottle is in the collection box of below for the gravity through body self falls, and this mode is simple, swift, but a lot of plastic bottles fall in same position, can lead to piling up in the middle of the plastic bottle in the collection box to need follow-up again to make the plastic bottle distribute evenly through artifical or other mechanical device, increased manufacturing cost and manpower, need improve.

Disclosure of Invention

Based on the above, the invention aims to provide a stretching mechanism for a plastic bottle blank for a plastic bottle injection mold, which aims to solve the technical problems that the stretching tube jacking action area is small and material center accumulation in a collection box is easily caused during mold discharging in the existing plastic bottle injection mold.

In order to achieve the purpose, the invention provides the following technical scheme: a stretching mechanism of a plastic bottle blank for a plastic bottle injection mold comprises a blow mold, a supporting block and a clamping block, wherein the blow mold comprises a mold body and a cavity formed in the side wall of the mold body, the inner wall of the clamping block is provided with the stretching mechanism, a supporting mechanism is arranged below the clamping block and positioned at the top end of the supporting block, and an auxiliary blanking mechanism is arranged below the cavity on the side wall of the mold body;

the stretching mechanism is including the tensile pipe with block inner wall sliding connection, and the outer wall of tensile pipe has seted up the multiunit gas outlet, be provided with the top in the diapire of tensile pipe and stretch the piece, and be provided with drive mechanism in the lateral wall of tensile pipe, drive mechanism is including the rack board, the lateral wall of tensile pipe is located the top that the top stretches the piece and is provided with actuating mechanism, actuating mechanism is including drive gear, supporting mechanism is including the circular arc board that is located the supporting shoe top.

Through adopting above-mentioned technical scheme, can realize the top of continuation through tension mechanism and stretch to play the effect that prevents bottle embryo lateral wall resilience, the mode that the bottle embryo only relied on the support ring to support has effectively been alleviated to supporting mechanism simultaneously, plays the effect of protection sharing support ring bearing pressure, and the design of supplementary unloading mechanism can be so that fashioned plastic bottle can be even drop in the collection box, thereby plays the effect that prevents that the plastic bottle center is accumulational.

The blow molding die is characterized in that the top end of the clamping block is provided with an installation disc, the clamping block is rotatably connected with the installation disc through a bearing, the blow molding die is composed of two sets of die bodies, one end of the blow molding die is provided with a rotating seat, and the two sets of die bodies are rotatably connected with the rotating seat through rotating shafts.

By adopting the technical scheme, the clamping block can rotate; the effect of opening the mold body is achieved.

The invention is further arranged in that the top end of the stretching tube is provided with a gas injection hole, the gas injection hole is connected with an external pneumatic pump through a gas tube, the number of the gas outlets is multiple, the gas outlets are equidistantly distributed on the outer wall of the stretching tube, the inner wall of the stretching tube is connected with a piston in a sliding manner, and a cavity is formed in the stretching tube.

Through adopting above-mentioned technical scheme for the atmospheric pressure of external pneumatic pump can be through the gas injection hole input stretch tube inside, plays the effect that provides the blowing pressure to subsequent blowing operation, and the design of multiunit gas outlet makes the high pressure can be full of the bottle embryo fast, and then realizes the effect that the inflation was stereotyped.

The bottom wall of the stretching tube is provided with a groove, a plurality of groups of top stretching blocks are arranged in the groove, the top stretching blocks are circularly distributed in the bottom wall of the stretching tube, the outer walls of the top stretching blocks are circular arc side walls, and the expansion diameters of the top stretching blocks are slightly larger than the diameter of the bottle blank.

By adopting the technical scheme, the top stretching block can not influence the stretching pipe to go deep into the bottle blank, the expansion diameter of the top stretching block is slightly larger than the diameter of the bottle blank, and the side wall of the bottom of the bottle blank can be stretched to a certain extent, so that the difficulty of subsequent bottom blow molding is reduced.

The invention is further arranged in such a way that a power gear is arranged in the inner wall of the stretching pipe on one side of the rack plate, the power gear is meshed with the rack plate through a gear, the power gear is rotatably connected with the inner wall of the stretching pipe through a bearing, the bottom end of the power gear is meshed with a driven gear through a gear, one end of the driven gear is fixedly connected with a driving turntable, and the outer wall of the driving turntable is connected with a transmission belt.

Through adopting above-mentioned technical scheme, play the effect of power transmission.

The invention is further arranged in such a way that a driven turntable is arranged on the inner side of the transmission belt and below the driven gear, one end of the driven turntable is fixedly connected with the driving gear through a coupling, a rotating gear is meshed and connected below one side of the driving gear through a gear and is fixedly connected with the top extension block through a fixed shaft, one end of the rotating gear is provided with a torsion spring, and the torsion spring is fixedly connected with the inner wall of the extension pipe.

Through adopting above-mentioned technical scheme for drive mechanism, actuating mechanism mutually support and can drive the piece that stretches out and expand, and the design of torsional spring makes the piece that stretches out can automatic re-setting under the condition that does not need external force.

The invention is further provided with an arc-shaped groove arranged on the end surface of the arc plate, and the outer wall of the clamping block is provided with a sliding block matched with the inner wall of the arc-shaped groove.

Through adopting above-mentioned technical scheme, drive block pivoted effect when playing the slider and sliding.

The auxiliary blanking mechanism comprises a placing groove formed in the side wall of the die body, rubber hoses are rotatably connected inside the placing groove through bearings, the number of the rubber hoses is two, the bottom end of one group of the rubber hoses is provided with an adjusting gear, the bottom end of the rubber hose is fixedly connected with the top end of the adjusting gear, the bottom end of the other group of the rubber hoses is fixedly connected with a connecting shaft, and the bottom end of the connecting shaft is fixedly connected with the top end of the adjusting gear.

Through adopting above-mentioned technical scheme for two sets of rubber hose can produce anomalous guide effect to the bottle that descends, and then play and prevent the accumulational effect in collecting box center.

The invention is further arranged in that one end of the adjusting gear is provided with an arc rack penetrating into the die body, the arc rack is meshed with the adjusting gear through a gear, one end of the arc rack is fixedly connected with the side wall of the die body, and the arc rack is connected with the inner wall of the die body in a sliding manner.

Through adopting above-mentioned technical scheme for the circular arc rack drives the adjusting gear and rotates, realizes the expansion and the closed effect of rubber hose.

In summary, the invention mainly has the following beneficial effects:

1. the invention adopts the arrangement of the stretching mechanism, the transmission mechanism and the driving mechanism, firstly, the external pneumatic cylinder extrudes the stretching tube to be inserted into the bottle blank, so that the bottom end of the stretching tube is higher than the bottom end of the bottle blank, then, the external pneumatic pump supplies low pressure, low-pressure air is introduced into a cavity in the stretching tube through the air injection hole, the air pressure can push the piston to move downwards on the inner wall of the stretching tube along with the gradual rise of the air pressure in the cavity, at the moment, the rack plate can move downwards along with the piston, in the process, the rack plate can drive the power gear to rotate, the power gear drives the driven gear to rotate through the gear meshing action after rotating, the driven gear drives the driving turntable to rotate after rotating, the driving turntable can drive the driven turntable to rotate through the transmission belt after rotating, the driving gear drives the rotating gear to rotate through the gear meshing action after rotating, the rotating gear drives the top extension block to rotate through the fixed shaft, the top extension block gradually rotates outwards to be unfolded, a torsion spring connected with one end of the top extension block and the inner wall of the stretching tube is in a force storage state, after the top extension block is completely unfolded, the top extension block not only can extrude the bottom side wall of the bottle blank to enable the bottom side wall of the bottle blank to be unfolded outwards for a certain distance, the pretreatment of blow molding of the bottom side wall of the bottle blank is achieved, the subsequent direct rapid molding of the bottom side wall is facilitated, simultaneously, a circular surface can be formed at the bottom end of the top extension block after the top extension block is unfolded, the contact area between the top extension block and the bottom end of the bottle blank is increased, then, the stretching tube is continuously extruded downwards through the external pneumatic cylinder, the stretching tube carries out top extension on the bottle blank through the top extension block at the bottom, further, the stretching of the side wall of the bottle blank is enabled to provide necessary stretching operation for the subsequent blow molding, after the blow molding process is finished, the external air pump stops working, and the air pressure acting on the piston disappears, at the moment, the action of the reset elasticity of the torsion spring can enable the rotating gear to rotate reversely, and then the rotating gear drives the top extension block to rotate reversely to the groove on the bottom wall of the extension pipe to realize reset, and simultaneously the rotating gear can drive the driving gear to rotate reversely, so that the driving gear drives the driven gear to rotate reversely through the action of the driven turntable, the driving belt and the driving turntable, the driven gear rotates reversely so as to drive the power gear to rotate reversely, the power gear drives the rack plate to move upwards after rotating reversely, and the rack plate drives the piston to move upwards to realize reset, in the process, a round surface formed after a plurality of groups of top extension blocks are unfolded increases the contact area between the top extension blocks and the bottom end of the bottle blank, so that the acting force generated when the top extension blocks stretch the bottle blank can be uniformly distributed on the plurality of groups of top extension blocks, meanwhile, the bottle blank is uniformly stressed, the bottom wall of the bottle blank is not easily damaged, the qualification rate of products is improved, and further, the side wall of the top extension block is arc-shaped and smooth in texture, so that the side wall of the bottle blank cannot be scratched when the top extension block rotates gradually to a horizontal state, and the unfolded top extension block can stretch the side wall of the bottom of the bottle blank to a certain degree, so that the bottom wall of the bottle blank can be initially unfolded while the top extension block extends the bottle blank, and the bottom wall of the bottle blank is convenient for rapid expansion molding of the bottom wall of a subsequent bottle blank;

2. according to the invention, by arranging the supporting mechanism and the auxiliary blanking mechanism, when the external pneumatic cylinder drives the clamping block to move downwards, the sliding block on the outer wall of the clamping block can move to the inside of the arc plate, and the sliding block can drive the clamping block to rotate under the guiding action of the arc groove on the end surface of the arc plate, so that the clamping block is clamped and fixed with the bottle blank port through the thread action, thereby sharing the blow molding pressure borne by the supporting ring and avoiding the unqualified product caused by the breakage of the supporting ring, so that the economic loss is caused; after the blow molding die finishes blow molding of plastic bottles, the die body is opened, the arc rack positioned on one side of the die body moves along with the die body, the arc rack can drive the adjusting gear to rotate through the gear meshing effect, the adjusting gear in one group of die body can directly drive the rubber hose to rotate out of the placing groove after rotating, the adjusting gear in the second group of die body can drive the rubber hose to rotate out of the placing groove through the connecting shaft after rotating, and the two groups of rubber hoses collide with the plastic bottles discharged through gravity after being unfolded, because the rubber hose has elasticity, the plastic pipe can be fed irregularly, so that the plastic bottles can be uniformly distributed in the external collection box, the problem of piling up at follow-up processing collecting box center has been avoided, has also practiced thrift manufacturing cost when using manpower sparingly, has effectively solved the mould and has leaded to the accumulational technical problem of material center in the collecting box easily when the ejection of compact.

Drawings

FIG. 1 is a schematic three-dimensional structure of the present invention;

FIG. 2 is a schematic view of a stretched tube structure of the present invention;

FIG. 3 is a schematic view of the internal structure of the stretching tube of the present invention;

fig. 4 is a partial enlarged view of the invention at a in fig. 3.

FIG. 5 is an enlarged view of a portion of the invention at B in FIG. 3;

FIG. 6 is a schematic view of the bottom structure of the stretched tube of the present invention;

FIG. 7 is a schematic view of the piston structure of the present invention;

FIG. 8 is a schematic view of the top-extension block structure of the present invention;

FIG. 9 is a side view of the deflector plate of the present invention;

FIG. 10 is a schematic view of the internal structure of the die body according to the present invention;

FIG. 11 is a schematic top cross-sectional view of the die body of the present invention;

FIG. 12 is a side partial cross-sectional view of the die body of the present invention.

In the figure: 1. a blow mold; 101. a mold body; 102. a cavity; 2. a support block; 3. a clamping block; 4. a stretching mechanism; 401. stretching the tube; 402. an air outlet; 403. a cavity; 404. a piston; 405. a top extension block; 5. a transmission mechanism; 501. a rack plate; 502. a power gear; 503. a driven gear; 504. an active turntable; 505. a drive belt; 506. a driven turntable; 6. a drive mechanism; 601. a drive gear; 602. a rotating gear; 603. a torsion spring; 604. a fixed shaft; 7. a support mechanism; 701. a circular arc plate; 702. a slider; 703. an arc-shaped slot; 8. an auxiliary blanking mechanism; 801. a placement groove; 802. a rubber hose; 803. an adjusting gear; 804. a circular arc rack; 805. and (7) connecting the shafts.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The following describes an embodiment of the present invention based on its overall structure.

A stretching mechanism of a plastic bottle blank for a plastic bottle injection mold comprises a blow mold 1, a supporting block 2 and a clamping block 3, as shown in FIGS. 1-12, the blow mold 1 comprises a mold body 101 and a cavity 102 formed in the side wall of the mold body 101, a stretching mechanism 4 is arranged on the inner wall of the clamping block 3, a supporting mechanism 7 is arranged below the clamping block 3 and at the top end of the supporting block 2, an auxiliary blanking mechanism 8 is arranged below the cavity 102 on the side wall of the mold body 101, the auxiliary blanking mechanism 8 comprises a placing groove 801 formed in the side wall of the mold body 101, rubber hoses 802 are rotatably connected in the placing groove 801 through bearings, the number of the rubber hoses 802 is two, an adjusting gear 803 is arranged at the bottom end of one group of the rubber hoses 802, the bottom end of the rubber hose 802 is fixedly connected with the top end of the adjusting gear 803, a connecting shaft 805 is fixedly connected at the bottom end of the other group of the rubber hoses 802, the bottom end of the connecting shaft 805 is fixedly connected with the top end of the adjusting gear 803, so that the rubber hose 802 can be conveniently unfolded and closed, one end of the adjusting gear 803 is provided with an arc rack 804 penetrating into the die body 101, the arc rack 804 is connected with the adjusting gear 803 in a gear meshing manner, one end of the arc rack 804 is fixedly connected with the side wall of the die body 101, the arc rack 804 is connected with the inner wall of the die body 101 in a sliding manner, when the die body 101 moves, the arc rack 804 at one side of the die body 101 moves along with the die body 101, at the moment, the arc rack 804 drives the adjusting gear 803 to rotate through the gear meshing effect, the adjusting gear 803 inside one group of the die body 101 directly drives the rubber hose 802 to rotate out of the placing groove 801 after rotating, the adjusting gear 803 inside the second group of the die body 101 drives the rubber hose 802 to rotate out of the placing groove 801 through the connecting shaft 805 after rotating, after being unfolded, the two groups of rubber hoses 802 collide with the discharged plastic bottles, and due to the elasticity of the rubber hoses 802, irregular discharging can be carried out on the plastic pipes, so that the plastic bottles can be uniformly distributed in an external collection box;

the stretching mechanism 4 comprises a stretching pipe 401 connected with the inner wall of the clamping block 3 in a sliding manner, the outer wall of the stretching pipe 401 is provided with a plurality of groups of air outlets 402, the bottom wall of the stretching pipe 401 is provided with a top stretching block 405, the side wall of the stretching pipe 401 is provided with a transmission mechanism 5, the transmission mechanism 5 comprises a rack plate 501, one side of the rack plate 501 is positioned in the inner wall of the stretching pipe 401 and is provided with a power gear 502, the power gear 502 is connected with the rack plate 501 through gear meshing, the power gear 502 is rotatably connected with the inner wall of the stretching pipe 401 through a bearing, the bottom end of the power gear 502 is connected with a driven gear 503 through gear meshing, one end of the driven gear 503 is fixedly connected with a driving turntable 504, the outer wall of the driving turntable 504 is connected with a transmission belt 505, the rack plate 501 drives the power gear 502 to rotate when moving along with the piston 404, the power gear 502 drives the driven gear 503 to rotate through gear meshing after rotating, the driven gear 503 rotates to drive the driving turntable 504 to rotate, the side wall of the stretching tube 401 is arranged above the top extension block 405, the driving mechanism 6 comprises a driving gear 601, the supporting mechanism 7 comprises an arc plate 701 arranged at the top end of the supporting block 2, an arc groove 703 is arranged on the end surface of the arc plate 701, the outer wall of the clamping block 3 is provided with a sliding block 702 matched with the inner wall of the arc groove 703, the inside of the clamping block is provided with a clamping groove matched with the bottle blank port, the inner wall of the clamping groove is provided with a thread wall matched with the bottle blank port thread, when the clamping block 3 moves downwards, the sliding block 702 on the outer wall of the clamping block 3 moves to the inside of the arc plate 701, and the sliding block 702 can drive the clamping block 3 to rotate under the guiding action of the arc groove on the end surface of the arc plate 701, so that the clamping block 3 is clamped and fixed with the bottle blank port through the thread action, thereby sharing the blow molding pressure borne by the support ring.

Referring to fig. 1, a mounting plate is disposed on the top end of the engaging block 3, the engaging block 3 and the mounting plate are rotatably connected through a bearing, the blow mold 1 is composed of two sets of mold bodies 101, a rotating base is disposed at one end of the blow mold 1, and the two sets of mold bodies 101 are rotatably connected with the rotating base through a rotating shaft, so as to facilitate rotation of the engaging block 3 and mold opening and closing of the mold bodies 101.

Referring to fig. 2 and 3, a gas injection hole is formed in the top end of the stretching tube 401, the gas injection hole is connected to an external pneumatic pump through a gas tube, the number of the gas outlets 402 is multiple, the multiple gas outlets 402 are equidistantly distributed on the outer wall of the stretching tube 401, a piston 404 is slidably connected to the inner wall of the stretching tube 401, a cavity 403 is formed in the stretching tube 401, the external pneumatic pump is connected to the gas injection hole through a connecting tube, low-pressure air is injected, high pressure is injected after the bottle blank expands, the bottle blank expands once to the inner wall of the cavity 102 to complete shaping, a gas circulation channel is formed during the blowing process of the gas outlets 402, the piston 404 can move on the inner wall of the stretching tube 401, and the gas pressure can be conveniently formed in the cavity 403 to push the piston 404.

Referring to fig. 3 and 6, a groove is formed in the bottom wall of the stretching tube 401, a plurality of sets of top-stretching blocks 405 are all arranged in the groove, the plurality of sets of top-stretching blocks 405 are circularly distributed in the bottom wall of the stretching tube 401, outer walls of the plurality of sets of top-stretching blocks 405 are all arc-shaped side walls, expansion diameters of the plurality of sets of top-stretching blocks 405 are slightly larger than the diameter of the bottle embryo, the plurality of sets of top-stretching blocks 405 are expanded to form a circular surface, so that a contact area with the bottom end of the bottle embryo is increased, acting force generated when the top-stretching blocks 405 push the bottle embryo can be uniformly distributed on the plurality of sets of top-stretching blocks 405, meanwhile, the bottle embryo is uniformly stressed, so that the bottom wall of the bottle embryo is not easily damaged, the qualification rate of products is improved, further, the diameters of the plurality of sets of top-stretching blocks 405 when being expanded are slightly larger than the diameter of the bottle embryo, and the side walls of the top-stretching blocks 405 are circular and smooth in shape, so that the top-stretching blocks 405 cannot scratch the side walls of the bottle embryo when gradually rotating to the bottle embryo to the horizontal state, and the top after expanding stretches the piece 405 and can strut bottle embryo bottom lateral wall to a certain extent, and then makes the top stretch the piece 405 and can also obtain preliminary expansion with the bottle embryo diapire when stretching the bottle embryo at the top, the quick inflation of the follow-up bottle embryo diapire of being convenient for.

Referring to fig. 5 and 8, a driven turntable 506 is mounted on the inner side of the transmission belt 505 below the driven gear 503, one end of the driven turntable 506 is fixedly connected with the driving gear 601 through a coupling, a rotating gear 602 is connected below one side of the driving gear 601 through gear engagement, the rotating gear 602 is fixedly connected with the top extension block 405 through a fixed shaft 604, a torsion spring 603 is mounted at one end of the rotating gear 602, the torsion spring 603 is fixedly connected with the inner wall of the stretching tube 401, the driving turntable 504 drives the driven turntable 506 to rotate through the transmission belt 505 after rotating, the driven turntable 506 drives the driving gear 601 to rotate after rotating, the rotating gear 602 drives the rotating gear 602 to rotate through gear engagement after rotating, the rotating gear 602 drives the top extension block 405 to rotate through the fixed shaft 604, and at this time, the torsion spring 603 starts to store power.

The working principle of the invention is as follows: firstly, a bottle blank to be blown is placed on the inner sides of two groups of mould bodies 101, the first-step limiting fixation is realized through a support ring at a bottle blank port and a support block 2, then the two groups of mould bodies 101 are closed, a clamping block 3 is driven to move downwards through an external pneumatic cylinder, a sliding block 702 on the outer wall of the clamping block 3 can move to the inside of an arc plate 701, the sliding block 702 can drive the clamping block 3 to rotate under the guiding action of an arc groove 703 on the end surface of the arc plate 701, and then the clamping block 3 is clamped and fixed with a bottle blank port thread through the thread action, so that the effect of sharing the support ring to bear the blowing pressure is realized, and the unqualified product caused by the breakage of the support ring is avoided;

then, the stretching tube 401 is extruded by an external pneumatic cylinder to be inserted into the bottle blank, the bottom end of the stretching tube 401 is higher than the bottom end of the bottle blank, then, a low pressure is supplied by an external pneumatic pump, low-pressure air is introduced into a cavity in the stretching tube 401 through an air injection hole, along with the gradual rise of the air pressure in the cavity, the air pressure can push the piston 404 to move downwards on the inner wall of the stretching tube 401, at the moment, the rack plate 501 can move downwards along with the piston 404, in the process, the rack plate 501 can drive the power gear 502 to rotate through the gear meshing effect, the power gear 502 drives the driven gear 503 to rotate through the gear meshing effect after rotating, the driven gear 503 can drive the driving turntable 504 to rotate after rotating, the driving turntable 504 can drive the driven turntable 506 to rotate through the transmission belt 505 after rotating, and the transmission effect of the power is realized;

the driven turntable 506 rotates to drive the driving gear 601 to rotate, the driving gear 601 rotates to drive the rotating gear 602 to rotate through the gear meshing action, the rotating gear 602 drives the top extension block 405 to rotate through the fixed shaft 604, the top extension block 405 gradually rotates outwards to expand, and the torsion spring 603 connected with the inner wall of the extension tube 401 at one end of the top extension block 405 is in a force accumulation state, when the top extension block 405 is completely expanded, because the expansion diameter of the top extension block 405 is slightly larger than the diameter of the bottle blank, the top extension block 405 not only can extrude the side wall at the bottom of the bottle blank, so that the side wall at the bottom of the bottle blank is expanded outwards for a certain distance, the pretreatment effect of blow molding on the side wall at the bottom of the bottle blank is achieved, meanwhile, the circular surface formed at the bottom end of the top extension block 405 after the top extension block 405 is expanded can also increase the contact area between the top extension block 405 and the bottom end of the bottle blank, so that the acting force of the extension tube 401 when the bottle blank is stretched can be uniformly distributed on a plurality of groups of top extension blocks 405, meanwhile, the bottle blank is uniformly stressed, so that the bottom wall of the bottle blank is not easily damaged, and the qualification rate of products is improved;

then the stretching tube 401 is continuously extruded downwards by an external pneumatic cylinder, the stretching tube 401 carries out top extension on the bottle blank by a top extension block 405 at the bottom, so as to stretch the side wall of the bottle blank, provide the necessary stretching operation for the subsequent blow molding, and after the blow molding process is finished, when the external air pump stops working, the air pressure acting on the piston 404 disappears, and the action of the restoring elasticity of the torsion spring 603 makes the rotating gear 602 rotate reversely, and then the rotating gear 602 drives the top extension block 405 to rotate reversely to the groove on the bottom wall of the extension pipe 401 to realize reset, and meanwhile, the rotating gear 602 rotates reversely to drive the driving gear 601 to rotate reversely, the driving gear 601 drives the driven gear 503 to rotate reversely through the action of the driven turntable 506, the transmission belt 505 and the driving turntable 504, the driven gear 503 rotates reversely so as to drive the power gear 502 to rotate reversely, the power gear 502 rotates reversely so as to drive the rack plate 501 to move upwards, and the rack plate 501 drives the piston 404 to move upwards so as to realize resetting;

after the blow molding of the plastic bottle is completed by the blow molding die, the die body 101 is opened, at the moment, the arc rack 804 positioned on one side of the die body 101 moves along with the die body 101, the arc rack 804 can drive the adjusting gear 803 to rotate through the gear meshing effect, the adjusting gear 803 in one group of the die body 101 can directly drive the rubber hose 802 to rotate out of the placing groove 801 after rotating, the adjusting gear 803 in the second group of the die body 101 can drive the rubber hose 802 to rotate out of the placing groove 801 through the connecting shaft 805 after rotating, and the two groups of the rubber hoses 802 can collide with the plastic bottle which is fed by gravity after being unfolded, so that the plastic pipe can be fed irregularly due to the elasticity of the rubber hose 802, the plastic bottle can be uniformly distributed in an external collecting box, and the problem of stacking the centers of the collecting boxes in subsequent processing is avoided;

when two sets of closed mould bodies 101, the arc rack 804 is corresponding to the inside removal of mould body 101, and then the arc rack 804 drives adjusting gear 803 antiport for adjusting gear 803 drives rubber hose 802 and removes to the inside completion of standing groove 801 and accomodate, thereby guarantee the leakproofness when mould body 101 closes the mould.

Although embodiments of the present invention have been shown and described, it is intended that the present invention should not be limited thereto, that the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples, and that modifications, substitutions, variations or the like, which are not inventive and may be made by those skilled in the art without departing from the principle and spirit of the present invention and without departing from the scope of the claims.

Claims

1. The utility model provides a stretching mechanism of plastic bottle embryo for plastic bottle injection mold, includes blow mold (1), supporting shoe (2) and block piece (3), blow mold (1) is including mould body (101) and cavity (102) that are located mould body (101) lateral wall and offer, its characterized in that: a stretching mechanism (4) is arranged on the inner wall of the clamping block (3), a supporting mechanism (7) is arranged below the clamping block (3) and positioned at the top end of the supporting block (2), and an auxiliary blanking mechanism (8) is arranged on the side wall of the die body (101) and positioned below the cavity (102);

tensile mechanism (4) including with block (3) inner wall sliding connection's tensile pipe (401), and the outer wall of tensile pipe (401) has seted up multiunit gas outlet (402), be provided with in the diapire of tensile pipe (401) and stretch piece (405), and be provided with drive mechanism (5) in the lateral wall of tensile pipe (401), drive mechanism (5) are including rack plate (501), the top that the lateral wall of tensile pipe (401) is located top and stretches piece (405) is provided with actuating mechanism (6), actuating mechanism (6) are including drive gear (601), supporting mechanism (7) are including arc plate (701) that are located supporting shoe (2) top.

2. The stretching mechanism of plastic bottle embryo for plastic bottle injection mold according to claim 1, characterized in that: the top of block (3) is provided with the mounting disc, and block (3) and mounting disc pass through the bearing and rotate and be connected, blow mold (1) comprises two sets of mould bodies (101), and the one end of blow mold (1) is provided with rotates the seat, and is two sets of mould body (101) all rotate with rotating the seat through the pivot and are connected.

3. The stretching mechanism of plastic bottle embryo for plastic bottle injection mold according to claim 1, characterized in that: the gas injection hole has been seted up on the top of tensile pipe (401), and the gas injection hole passes through the trachea and is connected with external pneumatic pump, the quantity of gas outlet (402) is the multiunit, and multiunit gas outlet (402) equidistance distribute at the outer wall of tensile pipe (401), the inner wall sliding connection of tensile pipe (401) has piston (404), and the inside of tensile pipe (401) has seted up cavity (403).

4. The stretching mechanism of plastic bottle embryo for plastic bottle injection mold according to claim 3, characterized in that: be provided with the recess in the diapire of tensile pipe (401), the multiunit top is stretched piece (405) and is all set up in the recess, and the multiunit top is stretched piece (405) circular distribution in tensile pipe (401) diapire, the multiunit the outer wall of top is the circular arc lateral wall, and the multiunit the expansion diameter of top is stretched piece (405) and is slightly greater than the diameter of bottle embryo.

5. The stretching mechanism of plastic bottle embryo for plastic bottle injection mold according to claim 1, characterized in that: one side of rack board (501) is arranged in the inner wall of tensile pipe (401) and installs power gear (502), and power gear (502) is connected through gear engagement with rack board (501), and power gear (502) rotate with tensile pipe (401) inner wall through the bearing and be connected, the bottom of power gear (502) is connected with driven gear (503) through gear engagement, and the one end fixedly connected with initiative carousel (504) of driven gear (503), the outer wall connection of initiative carousel (504) has driving belt (505).

6. The stretching mechanism of plastic bottle embryo for plastic bottle injection mold according to claim 5, characterized in that: driven turntable (506) are installed to the inboard below that is located driven gear (503) of driving belt (505), and the one end of driven turntable (506) and drive gear (601) are through shaft coupling fixed connection, one side below of drive gear (601) is connected with rotating gear (602) through gear engagement, and rotating gear (602) and top stretch piece (405) through fixed axle (604) fixed connection, torsional spring (603) are installed to the one end of rotating gear (602), and the inner wall fixed connection of torsional spring (603) and tensile pipe (401).

7. The stretching mechanism of plastic bottle embryo for plastic bottle injection mold according to claim 1, characterized in that: the end face of the arc plate (701) is provided with an arc groove (703), the outer wall of the clamping block (3) is provided with a sliding block (702) matched with the inner wall of the arc groove (703), the inside of the clamping block (3) is provided with a clamping groove matched with the bottle blank port, and the inner wall of the clamping groove is provided with a threaded wall matched with the bottle blank port in a threaded manner.

8. The stretching mechanism of plastic bottle embryo for plastic bottle injection mold according to claim 1, characterized in that: supplementary unloading mechanism (8) are including standing groove (801) that lie in mould body (101) lateral wall to set up, and the inside of standing groove (801) is rotated through the bearing and is connected with rubber hose (802), the quantity of rubber hose (802) is two sets of, and is a set of the bottom of rubber hose (802) is provided with adjusting gear (803), and rubber hose (802) bottom and adjusting gear (803) top fixed connection, another group the bottom fixedly connected with connecting axle (805) of rubber hose (802), and connecting axle (805) bottom and adjusting gear (803) top fixed connection.

9. The stretching mechanism of plastic bottle preform for plastic bottle injection mold according to claim 8, characterized in that: one end of the adjusting gear (803) is provided with an arc rack (804) penetrating into the interior of the die body (101), the arc rack (804) is connected with the adjusting gear (803) through gear engagement, one end of the arc rack (804) is fixedly connected with the side wall of the die body (101), and the arc rack (804) is connected with the inner wall of the die body (101) in a sliding manner.