CN111791465A

CN111791465A - Plastic bottle blow molding mold

Info

Publication number: CN111791465A
Application number: CN202010737791.1A
Authority: CN
Inventors: 陈旺; 陈福珍; 刘云华
Original assignee: Hefei Xinsheng Plastic Technology Co ltd
Current assignee: Hefei Xinsheng Plastic Technology Co ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2020-10-20

Abstract

The invention provides a plastic bottle blow molding mold, which relates to the technical field of blow molding processing, and is used for carrying out blow molding on a bottle blank with a bottom barrel shape, and comprises a lower mold, an upper mold and a liquid blow molding device, wherein a molding cavity penetrating through the bottom end of the upper mold is formed in the middle of the top end of the upper mold, a lower mold is arranged at the bottom end of the upper mold, and the lower mold is used for sealing the bottom end of the molding cavity of the upper mold; according to the liquid blow molding device, the annular clamping groove is formed in the top end of the upper die and located at the neck ring, the pneumatic clamping assemblies are arranged on the inner walls of the clamping grooves at equal intervals, the liquid blow molding device is clamped and fixed through the pneumatic clamping assemblies, the movable clamping claws clamp and lock the liquid blow molding device in the clamping grooves, and therefore the liquid blow molding device is firm and reliable in installation and strong in sealing performance.

Description

Plastic bottle blow molding mold

Technical Field

The invention relates to the technical field of blow molding processing, in particular to a plastic bottle blow molding mold.

Background

As a blow molding apparatus for blow molding a resin bottle preform into a container, patent document 1: japanese patent laid-open publication No. 2004-122457;

for example, patent document 1 discloses a blow molding device including: a metal mold for blow molding (blow molding mold); a stretching rod that stretches the bottle preform; and a support column which supports the bottom of the bottle preform from the outside of the bottle preform. In this blow molding apparatus, while the bottom portion of the preform is supported by the support column, the preform is axially stretched by a stretching rod inserted into the preform, and pressurized gas is supplied into the preform to radially stretch (expand) the preform.

As a method of blow molding a preform into a container, in addition to a method of supplying a pressurized gas into the interior of a preform to stretch the preform as in the blow molding apparatus described in patent document 1, a method of supplying a liquid into the interior of a preform to stretch the preform (liquid blow molding) is known. In the case of forming a container by such liquid blow molding, there is a problem that the direction of the tensile deformation of the preform is liable to become unstable due to the movement (flow direction and/or strength thereof) of the liquid supplied into the preform in the preform. Therefore, in the liquid blow molding apparatus, it is particularly necessary to improve the stability at the time of the stretching deformation in the liquid blow molding by a constitution like the support column of patent document 1.

However, in such a liquid blow molding apparatus, if the support pillar is brought into contact with the bottom of the preform all the time in a state where the preform heated in advance is placed in the blow mold, there is a problem that the temperature of the bottom of the preform is lowered due to the contact with the support pillar, the solidification is accelerated, the bottom is not sufficiently stretched at the time of blow molding, and the thickness of the bottom of the container after molding cannot be made to be a desired thickness. Further, in the case of adopting a configuration in which the blow mold is closed in a state in which the support pillar is brought into contact with the bottom portion of the preform after the preform is placed in the blow mold, there is a problem in that the preform is displaced from an intended position at the time of mold clamping, and as a result, the preform may come into contact with the mouth portion of the preform or the like while the nozzle for supplying the fluid is being lowered, and the preform may be deformed or damaged.

Disclosure of Invention

In view of the problems of the prior art, an object of the present invention is to provide a plastic bottle blow molding mold that solves the problem of poor molding, such as a possibility that the bottom of a bottle preform is lowered in temperature due to contact with a support pillar, the solidification is accelerated, the bottom cannot be sufficiently stretched during blow molding, and the thickness of the bottom of a molded container cannot be made to be a desired thickness, when a support pillar is constantly brought into contact with the bottom of the bottle preform in a state where a preheated bottle preform is placed in the blow molding mold.

The technical problem to be solved by the invention is realized by adopting the following technical scheme: a plastic bottle blow molding mold is used for blow molding a cylindrical bottle blank with a bottom, and comprises a lower mold, an upper mold and a liquid blow molding device, wherein a molding cavity penetrating through the bottom end of the upper mold is formed in the middle of the top end of the upper mold, a lower mold is arranged at the bottom end of the upper mold, and the lower mold seals the bottom end of the molding cavity of the upper mold;

the molding cavity is provided with a shoulder part, a main body part and a neck ring, the main body part is arranged at the bottom of the molding cavity, the shoulder part is arranged above the main body in the molding cavity, the shoulder part is conical, the neck ring is arranged above the shoulder part, and the neck ring is arranged at the top end of the molding cavity;

the top of going up the mould just is located the neck ring position and has seted up the annular tight groove of ring form clamp, the equidistant pneumatic clamping assembly of installing of inner wall in tight groove of clamp, each pneumatic clamping assembly includes first air cock, pneumatic cylinder, third air cock, activity clamping jaw, the equidistant setting of pneumatic cylinder is inside the last mould that presss from both sides tight groove periphery, one side of the pneumatic cylinder is provided with the first air cock that connects with the outside, the opposite side of pneumatic cylinder is provided with the third air cock that connects with the outside intercommunication, the pneumatic cylinder sets up the round hole that link up towards the inner wall in tight groove of clamp, install sealed rubber buffer through sliding fit mode in the pneumatic cylinder, one side of the sealed rubber buffer is provided with the slide bar, and the slide bar passes the round hole through sliding fit mode and stretches out to the tight groove of clamp, and activity clamping jaw sets up to crooked arc piece, and activity, the movable clamping blocks are arranged at equal intervals at the top ends of the sliding rods extending out of the clamping grooves;

the liquid blow molding device is arranged in the clamping groove, the liquid blow molding device arranged in the clamping groove clamps and locks the liquid blow molding device through the movable clamping claw, the bottom of the liquid blow molding device is provided with a blow rod vertically extending into the molding cavity, the outer circular surface of the blow rod extending into the molding cavity is provided with a plurality of blow holes for blowing air to the outside at equal intervals, the bottle blank is placed in the molding cavity, the blow rod with the plurality of blow holes extends into the middle part of the bottle blank, the middle part of the top end of the lower die is provided with a telescopic rod, the top end of the telescopic rod is provided with a disc-shaped dropping liquid bearing tray, the top middle part of mould is seted up and is held tray matched with groove of stepping down with the dropping liquid, circular-arc sunken dropping liquid bearing groove has been seted up at the top middle part of dropping liquid bearing tray, the bottom of dropping liquid bearing groove bearing bottle base, the telescopic link can go up and down along the axial of bottle base at the shaping chamber.

As a preferable technical solution of the present invention, the drip tray includes extension plate chutes equidistantly formed in the interior of the drip tray, and extension plates inserted into each of the extension plate chutes in a sliding fit manner, a bottom support plate is provided at the bottom of the drip tray, weight-reducing springs are provided between the bottom support plate and the drip tray at equal intervals along the edge of the drip tray, a conical wedge block is provided at the middle of the top end of the bottom support plate, a connecting rod is provided at the bottom end of each of the extension plates inserted into the extension plate chutes, a walking roller is installed at the bottom end of each of the connecting rods, and the walking roller is in rolling connection with the top surface of the wedge block,

each spring hole is formed in the middle of each extending plate sliding groove, a return spring is embedded into each spring hole, a spring push rod is arranged at the top end of each return spring towards the middle of the connecting rod, and the top end of each spring push rod is connected with the surface of the connecting rod in a sliding mode.

In a preferred embodiment of the present invention, each of the elongated plates is curved in an arc-shaped manner in a direction toward the upper drip receiving groove.

As a preferred technical scheme, the lower die comprises a U-shaped sliding groove arranged in the lower die, the U-shaped sliding groove is formed in the bottom of the top end of the lower die, one end of the U-shaped sliding groove is communicated with the middle of the top end of the lower die, the bottom end of the telescopic rod is installed in the U-shaped sliding groove in a sliding fit mode, a plurality of universal joints are arranged at the bottom end of the telescopic rod installed in the U-shaped sliding groove, two adjacent universal joints are hinged end to end, the universal joint at the bottom end of the telescopic rod stretches into the other side of the U-shaped sliding groove along the U-shaped sliding groove in a bending mode, and an electric push rod is installed at the top end of the universal joint stretching into the other side of.

According to a preferable technical scheme of the invention, the top end of the lower die and the outer circular surface close to the lower die are provided with annular chip shoveling grooves, annular chip shoveling knives are embedded in the chip shoveling grooves in a sliding fit mode, and chip shoveling springs are arranged at equal intervals at the bottoms of the chip shoveling knives embedded in the chip shoveling grooves.

As a preferable technical scheme of the invention, the top end of the scrap shoveling knife is provided with an inclined blade slope, and the inner wall of the circular scrap shoveling knife is slightly larger than the inner wall of the forming cavity.

Compared with the prior art, the invention has the beneficial effects that:

the plastic bottle blow molding mold comprises a lower mold, an upper mold and a liquid blow molding device, wherein the lower mold is arranged at the bottom of the upper mold, the lower mold and the upper mold can be separated, the plastic bottle can be conveniently demolded after molding, a blowing rod vertically extending into a molding cavity is arranged at the bottom of the liquid blow molding device, a plurality of blowing holes for blowing air to the outside are arranged on the outer circular surface of the blowing rod extending into the molding cavity at equal intervals, a bottle blank is placed in the molding cavity, the blowing rod with the plurality of blowing holes extends into the middle of the bottle blank, the bottle blank formed into a bottom cylinder shape is subjected to liquid blow molding in a blow molding horizontal tool to be molded into a profile structure of the molding cavity in the plastic bottle blow molding mold, and the bottom of the bottle blank is formed into a bottom cylinder shape during blow molding, so that the weight is larger, the bottle blank is supported by the liquid dropping bearing tray at the bottom, and the telescopic rod at the bottom of the liquid dropping bearing tray descends along with the deformation of the bottle blank caused by the liquid blow molding device. The thickness of the bottle wall of the bottle blank after blow molding is uniform, the thickness of the bottom and the body of the bottle blank after blow molding is avoided being nonuniform, and the structural attractiveness of the plastic bottle after blow molding is improved.

Secondly, the interior of the dropping liquid bearing tray of the invention comprises extension plate chutes which are equidistantly arranged in the dropping liquid bearing tray and extension plates which are embedded in each extension plate chute in a sliding fit mode, the bottom weight of a bottle blank is the largest in the initial stage of putting the bottle blank into a forming cavity, when the dropping liquid bearing tray bears the bottle blank in the forming cavity, the dropping liquid bearing tray is pressed by the weight of a bottle blank bottom cylinder, so that the extension plates in the dropping liquid bearing tray extend out, the bearing on the bottom of the bottle blank is increased, the bottle blank can gradually reduce the volume of the bottom cylinder at the bottom of the bottle blank after being deformed by a liquid blow molding device, the weight is gradually lightened, the weight borne by the dropping liquid bearing tray is reduced, the dropping liquid bearing tray is upwards lifted above the bottom supporting plate by a weight reduction spring, the extension plates are stretched on the dropping liquid bearing tray in the dropping liquid bearing tray, and a telescopic rod at the bottom of the dropping liquid bearing tray is descended along with the deformation of the bottle blank, the dropping speed of the telescopic rod is controlled by the electric push rod, so that the dropping liquid bearing tray continuously bears the bottom of the bottle blank, and the dropping liquid bearing tray extends into the abdicating groove until the bottle blank is subjected to blow molding, so that the bottle blank is subjected to blow molding to form a plastic bottle.

The liquid blow molding device is firmly and reliably installed and has strong sealing performance.

Fourthly, the invention is provided with a circular chip shoveling groove at the top end of the lower die and close to the outer circular surface of the lower die, a circular chip shoveling knife is embedded in the chip shoveling groove in a sliding fit manner, scraping burrs generated at the joint of two molds at the bottom of a plastic bottle after blow molding, installing scrap shoveling springs at equal intervals at the bottoms of the scrap shoveling knives embedded in the scrap shoveling grooves, storing energy by the scrap shoveling springs through thrust generated when the upper mold and the lower mold are closed, and when the upper mold and the lower mold are separated, the scrap shoveling spring releases the thrust to push the scrap shoveling knife to scrape off burrs at the bottom of the plastic bottle, the top end of the scrap shoveling knife is provided with an inclined blade inclined plane, the inner wall of the circular scrap shoveling knife is slightly larger than the inner wall of the forming cavity, the plastic bottle outer circle surface after the plastic bottle is formed can be scraped to the burrs through the scrap shoveling knife, and the surface attractiveness after the plastic bottle is formed is improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of a front cross-sectional view of a bottle preform supported in a molding cavity by a drip tray according to the present invention;

FIG. 2 is a schematic sectional front view showing the structure of the dropping tray retracted into the receding groove in the molding cavity according to the present invention;

FIG. 3 is a front sectional view of the lower mold of the present invention;

FIG. 4 is a front sectional view of the drop tray of the present invention;

FIG. 5 is a schematic cross-sectional view of the extension panel retracted into the drip tray of the present invention;

FIG. 6 is a schematic top view of the elongated plate of the present invention deployed at equal intervals around the outer circumferential surface of the drip tray;

FIG. 7 is a schematic top view of the pneumatic clamping assembly of the present invention installed in the abdicating groove;

FIG. 8 is an enlarged view of a portion of FIG. 2;

in the figure: 1. a lower die, 101, a relief groove, 102, a telescopic rod, 103, a drop bearing tray, 104, a drop bearing bracket, 105, a U-shaped chute, 106, a universal joint, 107, an electric push rod, 108, an extension plate, 109, a connecting rod, 110, a walking roller, 111, a wedge, 112, a bottom support plate, 113, a weight reduction spring, 114, a return spring, 115, a spring hole, 116, a spring push rod, 117, a chip groove, 118, a chip removal spring, 119, a chip removal knife, 120, a blade inclined surface, 121, an extension plate chute, 2, an upper die, 201, a shoulder, 202, a main body, 203, a forming cavity, 204, a neck ring, 3, a clamping groove, 4, a pneumatic clamping component, 401, a first connection air nozzle, 402, a pneumatic cylinder, 403, a third connection air nozzle, 404, a movable clamping claw, 405, a sealing rubber plug, 5, a bottle blank, 6, a liquid blow molding device, 7, a blow rod, 8 and a blow hole.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described below by combining with the specific drawings, and it is to be noted that the embodiments and the features in the embodiments can be combined with each other in the application without conflict.

Referring to fig. 1-8, there is shown a schematic view of an overall structure of a plastic bottle blow molding mold,

a plastic bottle blow molding mold, carry on blow molding to the bottle base 5 with end tube-shape, the plastic bottle blow molding mold includes lower mould 1, upper mould 2 and liquid blow molding device 6, the top middle part of the upper mould 2 offers the shaping cavity 203 which runs through the bottom of the upper mould 2, there are lower moulds 1 in the bottom of the upper mould 2, the lower mould 1 seals the bottom of shaping cavity 203 of the upper mould 2;

the molding cavity 203 is provided with a conical shoulder part 201, a cylindrical main body part 202 and a neck ring 204 arranged above the shoulder part 201, the main body part 202 is arranged at the bottom of the molding cavity 203, the shoulder part 201 is arranged above the main body in the molding cavity 203, the shoulder part 201 is conical, the neck ring 204 is arranged above the shoulder part 201, and the neck ring 204 is arranged at the top end of the molding cavity 203;

the neck ring 204 is at the top of the main body 202, so that when the upper mold is upward for demolding, the plastic bottle is left at the top end of the lower mold 1, and demolding of the plastic bottle is facilitated.

The top end of the upper die 2 is provided with a circular clamping groove 3 at the neck ring 204, the inner wall of the clamping groove 3 is provided with pneumatic clamping components 4 at equal intervals, each pneumatic clamping component 4 comprises a first air receiving nozzle 401, a pneumatic cylinder 402, a third air receiving nozzle 403 and a movable clamping claw 404, the pneumatic cylinders 402 are arranged inside the upper die 2 at the periphery of the clamping groove 3 at equal intervals, one side of each pneumatic cylinder 402 is provided with the first air receiving nozzle 401 communicated with the outside, the other side of each pneumatic cylinder 402 is provided with the third air receiving nozzle 403 communicated with the outside, the pneumatic cylinder 402 is provided with a through round hole towards the inner wall of the clamping groove 3, a sealing rubber plug 405 is arranged in the pneumatic cylinder 402 in a sliding fit manner, one side of each sealing rubber plug 405 is provided with a sliding rod, the sliding rod penetrates through the round hole in a sliding fit manner to extend out of the clamping groove 3, the movable clamping blocks are arranged at equal intervals at the top ends of the sliding rods extending out of the clamping grooves 3;

specifically, the annular clamping groove 3 is formed in the top end of the upper die 2 and located at the neck ring 204, the pneumatic clamping assemblies 4 are arranged on the inner walls of the clamping grooves 3 at equal intervals, the liquid blow molding device 6 is clamped and fixed through the pneumatic clamping assemblies 4, the movable clamping claws 404 clamp and lock the liquid blow molding device 6 in the clamping grooves 3, and therefore the liquid blow molding device 6 is firmly and reliably mounted and is high in sealing performance.

The liquid blow molding device 6 is arranged in the clamping groove 3, the liquid blow molding device 6 arranged in the clamping groove 3 clamps and locks the liquid blow molding device 6 through the movable clamping claw 404, the bottom of the liquid blow molding device 6 is provided with a blowing rod 7 vertically extending into the molding cavity 203, a plurality of blowing holes 8 for blowing air to the outside are arranged on the outer circular surface of the blowing rod 7 extending into the molding cavity 203 at equal intervals, the bottle blank 5 is hung in the molding cavity 203, the top end of the bottle blank 5 can be fixed at the bottom of the liquid blow molding device 6, the blowing rod 7 with the plurality of blowing holes 8 extends into the middle of the bottle blank 5, the middle part of the top end of the lower mold 1 is provided with a telescopic rod 102, the top end of the telescopic rod 102 is provided with a disc-shaped drip tray 103, the middle part of the top end of the mold is provided with a abdicating groove 101 matched with the drip tray 103, the middle part of the top end, the drip receiving bracket 104 receives the bottom of the bottle preform 5, and the extendable rod 102 is movable up and down in the molding cavity 203 along the axial direction of the bottle preform 5.

In the upward posture in which the blow pin 7 is raised, a gap is formed between the drip receiving bracket 104 and the bottom of the preform 5, and the bottom of the preform 5 is supported at an advanced point during the molding process, and the expansion link 102 is lowered in accordance with the deformation of the preform 5 by the liquid blow molding device 6.

Specifically, the plastic bottle blow molding mold comprises a lower mold 1, an upper mold 2 and a liquid blow molding device 6, wherein the lower mold 1 is arranged at the bottom of the upper mold 2, the lower mold 1 and the upper mold 2 are separable, so as to facilitate demolding of a plastic bottle after molding, a blow rod 7 vertically extending into a molding cavity 203 is arranged at the bottom of the liquid blow molding device 6, a plurality of blow holes 8 for blowing air to the outside are arranged on the outer circumferential surface of the blow rod 7 extending into the molding cavity 203 at equal intervals, a bottle blank 5 is placed in the molding cavity 203, the blow rod 7 with the plurality of blow holes 8 extends into the middle of the bottle blank 5, the bottle blank 5 formed into a bottom cylinder shape is subjected to liquid blow molding in a blow molding transverse mold to form the outline structure of the molding cavity 203 in the plastic bottle molding mold, the bottle blank 5 is subjected to blow molding, the bottom cylinder shape is formed at the bottom of the bottle blank 5, the weight is larger, and is supported by a liquid dropping tray 103 at the, the telescopic rod 102 at the bottom of the drip tray 103 descends in response to the deformation of the preform 5 caused by the liquid blow-molding device 6. The bottle wall thickness of the bottle blank 5 after blow molding is uniform, the thickness unevenness of the bottom and the bottle body of the bottle blank 5 after blow molding is avoided, and the structural beauty of the plastic bottle after blow molding is improved.

The liquid drop bearing tray 103 comprises extension plate chutes 121 which are arranged in the liquid drop bearing tray 103 at equal intervals, and extension plates 108 which are embedded in each extension plate chute 121 in a sliding fit mode, a bottom supporting plate 112 is arranged at the bottom of the liquid drop bearing tray 103, the bottom supporting plate 112 is fixed at the top end of the telescopic rod 102, weight reducing springs 113 are arranged between the bottom supporting plate 112 and the liquid drop bearing tray 103 at equal intervals along the edge of the liquid drop bearing tray 103, a conical wedge block 111 is arranged in the middle of the top end of the bottom supporting plate 112, a connecting rod 109 is arranged at the bottom end of each extension plate 108 embedded in the extension plate chute 121, a walking roller 110 is arranged at the bottom end of each connecting rod 109, and the walking roller 110 is in rolling connection with the top surfaces,

a spring hole 115 is formed in the middle of each extending plate sliding groove 121, a return spring 114 is embedded in the spring hole 115, a spring push rod 116 is arranged at the top end of the return spring 114 towards the middle of the connecting rod 109, and the top end of the spring push rod 116 is connected with the surface of the connecting rod 109 in a sliding mode.

Specifically, the interior of the drip tray 103 of the present invention includes extension plate chutes 121 equidistantly arranged in the interior of the drip tray 103, and extension plates 108 embedded in each extension plate chute 121 in a sliding fit manner, the bottom weight of the bottle blank 5 is the largest at the initial stage of putting the bottle blank 5 into the molding cavity 203, when the drip tray 103 supports the bottle blank 5 in the molding cavity 203, the drip tray 103 is pressed by the weight of the bottom cylinder of the bottle blank 5, so that the extension plates 108 in the drip tray 103 extend out, so as to increase the support on the bottom of the bottle blank 5, the volume of the bottom cylinder at the bottom of the bottle blank 5 is gradually reduced after the bottle blank 5 deforms along with the liquid blowing device 6, the weight is gradually reduced, the weight borne by the drip tray 103 is reduced, the drip tray 103 is lifted upwards above the bottom support plate 112 by the weight reduction spring 113, the extension plates 108 stretch the drip tray 103 in the interior of the drip tray 103, the extension rod 102 at the bottom of the drip tray 103 is lowered along with the deformation of the bottle preform 5 caused by the liquid blow molding device 6, and the lowering speed of the extension rod 102 is controlled by the electric push rod 107, so that the drip tray 103 continuously supports the bottom of the bottle preform 5, and the drip tray 103 is inserted into the receding groove 101 until the bottle preform 5 is blow molded, so that the bottle preform 5 is blow molded into a plastic bottle.

Each extension board 108 is bent into an arc-shaped board towards the upper drip receiving groove 104, so that the bearing area of the bottle blank 5 is increased, and the bottle blank 5 is guided to the middle of the drip receiving groove 104 in the bearing process.

Specifically, bottle base 5 is because of being made of resin, and bottle base 5's structure has certain viscosity, supports in the middle of the bottom of bottle base 5 through dropping liquid bearing groove 104 on dropping liquid bearing tray 103 top, bears the edge of bottle base 5 through extension board 108 of dropping liquid bearing tray 103 outside, and the increase is to the area of bottle base 5 bottom bearing.

The bed die 1 is including offering in the inside U-shaped spout 105 of bed die 1, U-shaped spout 105 sets up in the top bottom of bed die 1, and wherein one end of U-shaped spout 105 and the top middle part intercommunication of bed die 1, the bottom of telescopic link 102 is installed in U-shaped spout 105 through sliding fit, install telescopic link 102 bottom in U-shaped spout 105 and be provided with a plurality of universal joints 106, it is articulated end to end between two adjacent universal joints 106, the universal joint 106 of telescopic link 102 bottom stretches into in the opposite side of U-shaped spout 105 along the U-shaped spout 105 is crooked, stretch into and install electric putter 107 on the universal joint 106 top of U-shaped spout 105 opposite side.

Specifically, the dropping liquid bearing tray 103 descends in the molding cavity 203, the universal joint 106 is pushed to slide in the U-shaped sliding groove 105 through the electric push rod 107 on the other side of the U-shaped sliding groove 105, so that the telescopic rod 102 stretches in the molding cavity 203, the telescopic rod 102 at the bottom of the dropping liquid bearing tray 103 descends along with the deformation of the bottle blank 5 caused by the liquid blow molding device 6, the descending speed of the telescopic rod 102 is controlled through the electric push rod 107, the descending speed of the dropping liquid bearing tray 103 is slightly higher than the deformation speed of the bottle blank 5, in the process of descending the dropping liquid bearing tray 103 downwards, the supporting force between the dropping liquid bearing tray 103 and the bottom of the bottle blank 5 is gradually reduced, and the extension plate 108 is gradually retracted into the extension plate sliding groove 121 through the pushing of the weight reduction spring 113 at the bottom of the dropping liquid bearing tray.

Specifically, when the drip tray 103 supports the bottom tube of the bottom of the bottle blank 5 in the molding cavity 203, the extension plate extends to the outside of the drip tray 103 by a length that is longer as the downward force applied to the drip tray 103 by the bottom of the bottle blank 5 is larger,

the top end of the lower die 1 and the outer circular surface close to the lower die 1 are provided with annular chip shoveling grooves 117, annular chip shoveling knives 119 are embedded into the chip shoveling grooves 117 in a sliding fit mode, and chip shoveling springs 118 are arranged at equal intervals at the bottoms of the chip shoveling knives 119 embedded into the chip shoveling grooves 117.

Specifically, the invention arranges a circular scrap shoveling groove 117 at the top end of the lower die 1 and close to the outer circle surface of the lower die 1, a circular scrap shoveling knife 119 is embedded in the scrap shoveling groove 117 in a sliding fit manner to scrape burrs generated at the joint of two dies at the bottom of the plastic bottle after blow molding, scrap shoveling springs 118 are arranged at equal intervals at the bottom of the scrap shoveling knife 119 embedded in the scrap shoveling groove 117, the scrap shoveling springs 118 store energy through the thrust generated when the upper die 2 and the lower die 1 are closed, when the upper die 2 and the lower die 1 are separated, the scrap shoveling springs 118 release the thrust to push the scrap shoveling knife 119 to scrape the burrs at the bottom of the plastic bottle,

the top end of the scrap shoveling knife 119 is provided with an inclined blade bevel 120, and the inner wall of the circular scrap shoveling knife 119 is slightly larger than that of the forming cavity 203.

Shovel bits sword 119's top has the cutting edge inclined plane 120 of slope, the annular shovel bits sword 119 inner wall of circle slightly is greater than becomes die cavity 203 inner wall for shovel bits sword 119 can scrape off the burr along the plastic bottle excircle after the shaping, improve the surperficial pleasing to the eye degree behind the plastic bottle shaping, lead to the piece of shoveling through cutting edge inclined plane 120, make the piece after scraping drop to the outside of plastic bottle, improve the in-process of scraping off at the burr, protection to the plastic bottle outer wall.

The working principle is as follows: when the plastic bottle blow molding mold is used, firstly, the liquid blow molding device 6 is installed in the clamping groove 3, the liquid blow molding device 6 installed in the clamping groove 3 clamps and locks the liquid blow molding device 6 through the movable clamping claw 404, the bottom of the liquid blow molding device 6 is provided with the air blowing rod 7 vertically extending into the molding cavity 203, the outer circular surface of the air blowing rod 7 extending into the molding cavity 203 is provided with a plurality of air blowing holes 8 blowing air to the outside at equal intervals, the top end of the bottle blank 5 is fixed at the bottom of the liquid blow molding device 6 and is suspended in the molding cavity 203, secondly, the air blowing rod 7 with a plurality of air blowing holes 8 at the bottom of the liquid blow molding device 6 extends into the middle part of the bottle blank 5, the bottle blank 5 formed into a bottomed cylinder shape is subjected to liquid blow molding in the horizontal mold to be molded into the outline structure of the molding cavity 203 in the plastic bottle blow molding mold, when the bottle preform 5 is blow-molded, the bottom of the bottle preform 5 is formed in a bottom cylindrical shape, which is heavy, and is supported by the drip tray 103 at the bottom, and the expansion link 102 at the bottom of the drip tray 103 is lowered in accordance with the deformation of the bottle preform 5 by the liquid blow-molding device 6. The bottle wall thickness of the bottle blank 5 after blow molding is uniform, the thickness unevenness of the bottom and the bottle body of the bottle blank 5 after blow molding is avoided, and the structural beauty of the plastic bottle after blow molding is improved.

In addition, the working principle of the scrap shoveling knife 119 of the present invention is as follows:

through the top at bed die 1 and be close to the outer disc that is close to bed die 1 and seted up annular shovel bits groove 117, it has annular shovel bits sword 119 to have the embedding of sliding fit mode in the shovel bits groove 117, scrape the burr that two moulds in plastic bottle bottom after the blow molding link up the department and produce, the equidistant shovel bits spring 118 of installing in shovel bits sword 119 bottom of the embedding in shovel bits groove 117, the thrust that produces when shovel bits spring 118 passes through last mould 2 and bed die 1 compound die carries out the energy storage, when going up mould 2 and bed die 1 separation, shovel bits spring 118 release thrust, promote shovel bits sword 119 and strike off the burr of plastic bottle bottom.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A plastic bottle blow molding mold for blow molding a bottle preform having a bottomed tubular shape, the plastic bottle blow molding mold comprising a lower mold, an upper mold and a liquid blowing device, characterized in that: the middle part of the top end of the upper die is provided with a forming cavity which is communicated with the bottom end of the upper die, the bottom end of the upper die is provided with a lower die, and the lower die seals the bottom end of the forming cavity of the upper die;

2. The plastic bottle blow molding mold of claim 1, wherein: the liquid drop bearing tray comprises extension plate chutes which are arranged in the liquid drop bearing tray at equal intervals and extension plates which are embedded in the extension plate chutes in a sliding fit mode, a bottom supporting plate is arranged at the bottom of the liquid drop bearing tray, weight reducing springs are arranged between the bottom supporting plate and the liquid drop bearing tray at equal intervals along the edge of the liquid drop bearing tray, conical wedge blocks are arranged in the middle of the top end of the bottom supporting plate, connecting rods are arranged at the bottom ends of the extension plates which are embedded in the extension plate chutes, walking rollers are mounted at the bottom ends of the connecting rods, and the walking rollers are in rolling connection with the top surfaces of the wedge blocks;

3. A plastic bottle blow molding mold in accordance with claim 2, wherein: each extension board upwards dropping liquid bearing groove direction is crooked into the arc.

4. The plastic bottle blow molding mold of claim 1, wherein: the bed die is including seting up in the inside U-shaped spout of bed die, the U-shaped spout sets up in the top bottom of bed die, just wherein one end of U-shaped spout and the top middle part intercommunication of bed die, the bottom of telescopic link is installed in the U-shaped spout through the sliding fit mode, install in the U-shaped spout the telescopic link bottom is provided with a plurality of universal joints, adjacent two articulated end to end between the universal joint, the universal joint of telescopic link bottom stretches into in the opposite side of U-shaped spout along the U-shaped spout bending, stretches into in U-shaped spout opposite side electric putter is installed on the universal joint top.

5. The plastic bottle blow molding mold of claim 1, wherein: the top of bed die just is close to the outer disc that is close to the bed die and has seted up annular shovel bits groove, it has the annular shovel bits sword to shovel the inslot through the embedding of sliding fit mode, imbeds in the shovel bits groove shovel bits sword equidistant installing of equal portion in bits sword bottom shovel bits spring.

6. The plastic bottle blow molding mold of claim 5, wherein: the top end of the scrap shoveling knife is provided with an inclined blade inclined plane, and the inner wall of the annular scrap shoveling knife is slightly larger than the inner wall of the forming cavity.