CN214491562U

CN214491562U - Air column air dispersing structure applied to bidirectional stretching hollow blow molding mold

Info

Publication number: CN214491562U
Application number: CN202120499824.3U
Authority: CN
Inventors: 谢国基; 姜晓平; 黄杨安; 梁炎均; 卢佳
Original assignee: GDXL Precise Machinery Co Ltd
Current assignee: GDXL Precise Machinery Co Ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-10-26
Anticipated expiration: 2031-03-09

Abstract

Be applied to gas column structure that looses on biaxial stretching cavity blow molding mould, including the mould body, the mould body is equipped with bearing mechanism including enclosing preceding mould and the back mould of die cavity bottom, die block board and the tensile pole that is located the die cavity bottom, bearing mechanism in the die cavity, and bearing mechanism includes die block pole and actuating mechanism, has seted up the gas column passageway in the die block pole, and the die block pole is connected with the air feed mechanism who inputs gas for the gas column passageway, is equipped with in the die cavity to discharge the die cavity air at this external exhaust structure of mould. The utility model discloses utilize the gas column to replace the purpose that the sill bar contact supported the bottle base, so make the sill bar need not with bottle base direct contact, avoided bottle base bottle blowing back bottom material parcel sill bar to influence product shaping quality and drawing of patterns difficulty scheduling problem, effectively ensured bottle base bottle blowing quality and improvement drawing of patterns efficiency. And through exhaust structure can be fast with the air discharge that forms after the gas column dispels in the die cavity outside the die cavity, effectively avoided the inside air of die cavity to influence the bottle blowing quality.

Description

Air column air dispersing structure applied to bidirectional stretching hollow blow molding mold

Technical Field

The utility model relates to a fashioned technical field of blowing container, concretely relates to be applied to the gas column structure of loosing on biaxial stretching cavity blow molding mould.

Background

In the existing blow molding container forming process, particularly in the blow molding method of an injection-stretch-blow two-step method, the axial stretching of a bottle blank is basically realized by contacting the inner bottom of the bottle blank with a stretching rod (round steel rod) to stretch the bottle blank to the bottom of a mold cavity at one time. And injecting compressed air in the stretching process of the stretching rod, blowing the bottle blank by means of the compressed air to enable the bottle blank to be tightly attached to the cavity wall of the mold, and cooling and shaping to obtain the hollow plastic product. When the bottle blank is stretched to be in contact with metal at the bottom of the mold cavity, the bottom of the bottle blank is cooled relatively quickly, and the material with limited stretching space is difficult to fully stretch, so that material accumulation is formed at the bottom of the container, material waste is caused, stress concentration is generated, the bottom of the container is easy to crack, and the bottle blank is particularly serious on a large-capacity container (more than 5L). In addition, when the vertical stretching dimension of the bottle preform is large, the stretching rod is prone to have unstable rate, insufficient rigidity and eccentricity at the bottom of the bottle preform, so that the wall thickness of the blow-molded container is not uniform, and the overall strength of the container is affected.

The company invents an axial bidirectional positioning stretching hollow blow molding method, and the specific technical scheme can refer to the Chinese invention patent application with the patent application number of 201811527312.2, and the technical scheme basically solves the technical problems. But discovery in the use, blow molding die has bottle base bottle blowing back bottom material parcel sill bar (support pole) to influence product shaping quality and the difficult scheduling problem of drawing of patterns, consequently this company makes further improvement to prior art, blow through the sill bar upper end and form the gas column that supports and hold the bottle base bottom in the die cavity, thereby make the sill bar need not direct contact bottle base, in order to solve the problem of bottom material parcel sill bar, nevertheless the gas column can produce a large amount of air in can the die cavity after assaulting bottle base bottom, these air can influence going on smoothly of bottle blowing work, so still need improve.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a be applied to the gas column structure that looses on the biaxial stretching cavity blow molding mould.

The utility model provides a technical scheme that its technical problem adopted is:

be applied to gas column structure that looses on biaxial stretching cavity blow molding mould, including the mould body, the mould body is including the preceding mould and the back mould that surround into the die cavity, be located the die cavity bottom die block, be used for installing the die block's die block board and stretch into the tensile pole in the die cavity from the die cavity top, be equipped with bearing mechanism in the die cavity, bearing mechanism includes that bottom bar and drive bottom bar stretch into the actuating mechanism at die cavity middle part, its characterized in that: the utility model discloses a mould, including the die body, the die body is equipped with the die cavity, the die cavity is equipped with the gas column passageway that can form the gas column in the die cavity and support bottle base bottom center with the bearing, the die cavity is connected with the air feed mechanism who inputs gas for the gas column passageway, air feed mechanism is located the outer one end of die cavity with the die cavity and is connected, be equipped with in the die cavity and discharge the air structure outside the die cavity, the air structure including locate on the die body and feed through outside exhaust hole, locate the exhaust gap between preceding die and the back die, the both sides in exhaust gap respectively with the exhaust hole with the die cavity intercommunication.

The utility model discloses in, exhaust structure is still including locating the sill bar and being located the outer gas vent that serves of die cavity, the one end of gas vent and the bottom intercommunication of gas column passageway, the other end are connected with the blast pipe, be provided with the automatically controlled valve who is used for opening and close its output on the output of blast pipe.

The utility model discloses in, be equipped with the through-hole on the die block, the die cavity is worn to the sill bar in from the through-hole, actuating mechanism installs the outside at the die block.

The utility model discloses in, exhaust structure is still including locating a plurality of air discharge ducts in the through-hole, and the air discharge duct extends along the axis direction of through-hole, and the both ends of air discharge duct communicate with the die cavity is inside respectively and the mould body is outside.

The utility model discloses in, air feed mechanism includes air supply equipment, air supply equipment passes through the input intercommunication of gas-supply pipe with the gas column passageway.

The utility model discloses in, the gas column passageway includes from the lower supreme lower direct current section that communicates in proper order, gathers a class section, goes up the direct current section down, the outside of sill bar is equipped with the air inlet of direct current section under the intercommunication, the direct current section passes through the output intercommunication of air inlet and air feed mechanism down, the output and the die cavity intercommunication of going up the direct current section.

The utility model discloses in, gather the section of flowing and for the diameter follow supreme convergent structure that reduces gradually down.

The utility model discloses in, direct current section and last direct current section are the diameter from supreme equal same straight-through shape structure down.

The utility model has the advantages that: the utility model discloses a be provided with the gas column passageway on the sill bar, support bottle base bottom center through gas column passageway spun gas column bearing to reach and utilize the gas column to replace the purpose that the sill bar contact supported the bottle base, so make the sill bar need not with bottle base direct contact, avoided bottle base bottle blowing back bottom material parcel sill bar influence product shaping quality and drawing of patterns difficulty scheduling problem, effectively ensured bottle base bottle blowing quality and improvement drawing of patterns efficiency. And the utility model discloses still be provided with exhaust structure, this exhaust structure can be fast with the air escape that the gas post formed after the disappearance in the die cavity outside the die cavity, has effectively avoided the inside air of die cavity to influence the bottle blowing quality.

Drawings

The invention will be further explained with reference to the drawings and the embodiments below:

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is a first partial schematic structural diagram of the present embodiment;

FIG. 3 is a second partial schematic structural diagram of the present embodiment;

fig. 4 is a schematic structural view of the bottom bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.

Referring to fig. 1~3, be applied to the gas column structure that looses on biaxial stretching cavity blow molding mould, including the mould body, the mould body is including enclosing preceding mould 1 and the back mould of die cavity, be located die cavity bottom die 3, be used for installing die cavity 3 board 4 of die cavity 3 and stretch into the tensile pole 5 of die cavity from the die cavity top, be equipped with bearing mechanism in the die cavity, bearing mechanism includes that bottom rod 6 and drive bottom rod 6 stretch into actuating mechanism 7 at die cavity middle part. Further, it can form the gas column in the die cavity in order to support the gas column passageway 1A at bottle base bottom center to have seted up in the sill bar 6, sill bar 6 is connected with the gas supply mechanism of giving gas column passageway 1A input gas, gas supply mechanism is connected with the one end that sill bar 6 is located the die cavity outside, and gas supply mechanism inputs gas to gas column passageway 1A, supports bottle base bottom center by the bearing by gas column passageway 1A blowout gas column again.

Furthermore, an exhaust structure capable of exhausting air in the die cavity outside the die body is arranged in the die cavity, the exhaust structure comprises an exhaust hole which is arranged on the die body and communicated with the outside and an exhaust gap which is arranged between the front die 1 and the rear die, and two sides of the exhaust gap are respectively communicated with the exhaust hole and the die cavity; after the air column impacts and supports the center of the bottom of the bottle blank, the air of the air column is dispersed to the periphery, enters the exhaust gap and is exhausted from the exhaust hole, so that the influence of the air in the mold cavity on the bottle blowing quality is avoided. In the above structure, an inner vent groove 41A and at least one outer vent groove 42A are provided on the mating surface of the front mold 1 or the rear mold, and the outer vent groove 42A is communicated with the inner vent groove 41A; when the front mold 1 and the rear mold are closed, the inner exhaust groove 41A is combined with the mold closing surface of the front mold 1 or the rear mold to form the exhaust gap, and the outer exhaust groove 42A is combined with the mold closing surface of the front mold 1 or the rear mold to form the exhaust hole.

The using principle of the present embodiment is basically the same as that of the application of chinese patent with application number 201811527312.2, except that the bottom rod 6 of the present embodiment does not directly contact and support the bottom of the bottle preform, when the bottle preform is stretched to the position of the supporting device, the bottom rod 6 has been extended from the bottom of the mold cavity and uses the air column ejected from the air column channel 1A to support the center of the bottom of the bottle preform which has been gradually stretched and expanded, so that the bottom of the bottle preform forms a conical bottom with a high supported point and a low periphery in advance; in addition, after the conical bottom is formed in advance, the stretching rod 5 and the bottom rod 6 are simultaneously stretched downwards and air pressure is continuously injected into the bottle blank, the bottom rod 6 guides the bottom of the bottle blank to directly fall at the central position of the bottom of the mold cavity through an air column, the bottle blank expands and is tightly attached to the inner wall of the mold cavity, then the bottle blank is cooled to form a blow molding container, and after the completion, the stretching rod 5 is withdrawn and returns to the original position.

As a preferred embodiment, as shown in fig. 1 and 4, the exhaust structure further includes an exhaust port 44A disposed at one end of the bottom rod 6 located outside the mold cavity, one end of the exhaust port 44A is communicated with the bottom of the air column channel 1A, the other end is connected to an exhaust pipe 7A, and an output end of the exhaust pipe 7A is provided with an electrically controlled valve 8A for opening and closing an output end thereof. The electric control valve 8A is an electromagnetic valve, when the air supply mechanism stops supplying air to the air column channel 1A, the electric control valve 8A works, the output end of the exhaust pipe 7A is opened to enable the air in the die cavity to flow back to the air column channel 1A, and the air sequentially passes through the exhaust port 44A and the exhaust pipe 7A to be exhausted outside, so that the exhaust efficiency of the die cavity is improved.

As shown in fig. 2 to 3, as a preferred embodiment, a plurality of protruding ribs 31 are uniformly distributed on the bottom mold 3, the plurality of ribs 31 are collected in the middle of the bottom mold 3 to form a protruding boss shape, a through hole 8 penetrating through the bottom mold 3 is formed in the center of the boss, the bottom rod 6 penetrates into the mold cavity from the through hole 8, the driving mechanism 7 is installed on the outer side of the bottom mold 3, and the bottom rod 6 and the stretching rod 5 are on the same axis. In addition, the exhaust structure further comprises a plurality of exhaust grooves 43A arranged in the through hole 8, the exhaust grooves 43A extend along the axial direction of the through hole 8, and two ends of each exhaust groove 43A are respectively communicated with the inside of the mold cavity and the outside of the mold body; when the gas column bearing supported bottle base bottom, the air in the die cavity can be followed outside exhaust groove 43A discharge die cavity to improve exhaust efficiency, when bottom bar 6 resets moreover, the support head on the bottom bar 6 can support on die block 3 and cover exhaust groove 43A and through-hole 8, in order to avoid the material on the bottle base to enter into exhaust groove 43A and through-hole 8.

In this embodiment, actuating mechanism 7 can be pneumatic cylinder, pneumatic cylinder or motor, when only needing the single bearing, preferably the cylinder, the reaction is quick, with low costs, when needs reciprocal bearing many times, preferably servo motor and drive mechanism thereof, can control reciprocal number of times and flexible amplitude through servo motor. In this embodiment, actuating mechanism 7 is connected with die block 3 through many connecting rods 9, and connecting rod 9 passes the vacancy of die block 3 board 4 and is connected with actuating mechanism 7, and many connecting rods 9 enclose into hollow actuating mechanism 7 installing support, separates actuating mechanism 7 and die block 3 through actuating mechanism 7 installing support, both made things convenient for actuating mechanism 7's installation, also avoided producing the influence each other, increase of service life.

As a preferred embodiment, the air supply mechanism comprises an air supply device 2A, and the air supply device 2A is communicated with the input end of the air column channel 1A through an air conveying pipe 3A; in this embodiment, the air supply device 2A is an air compressor, and when the bottom rod 6 has been extended from the bottom of the mold cavity, the output end of the air compressor outputs compressed air to make the air column channel 1A eject the air column.

As a preferred embodiment, as shown in fig. 1 and 4, the air column channel 1A includes a lower straight flow section 11A, a flow collecting section 12A, and an upper straight flow section 13A that are sequentially communicated from bottom to top, an air inlet 14A that is communicated with the lower straight flow section 11A is provided at the outer side of the bottom rod 6, the lower straight flow section 11A is communicated with the output end of the air supply mechanism through the air inlet 14A, the flow collecting section 12A is used for collecting the air flow to the upper straight flow section 13A, and then the air column is formed in the mold cavity by the ejection of the straight flow section to support the center of the bottom of the bottle blank.

In this embodiment, gather a class section 12A for the diameter from the gradual reduction shape structure of supreme diminishing down to on the air current concentrates on last direct current section 13A, form the gas column by last direct current section 13A output, thereby effectively improve the bearing support effect of gas column. In addition, the lower direct current section 11A and the upper direct current section 13A are of a straight-through structure with the same diameter from bottom to top, the diameter of the lower direct current section 11A is larger than that of the upper direct current section 13A, the diameter of the lower direct current section 11A is the same as the maximum diameter of the current collecting section 12A, and the diameter of the upper direct current section 13A is the same as the minimum diameter of the current collecting section 12A, so that the quality of the air column is further improved. And because the upper straight section 13A is a straight-through structure, in the production process, even if plastic waste is plugged in the upper straight section 13A, the plastic waste can be blown out through the air column channel 1A, the plastic waste is quickly blown out of the upper straight section 13A through the air pressure thrust of air, and the cleaning time is shortened.

As a preferred embodiment, as shown in fig. 1, the air delivery pipe 3A and the air supply device 2A are connected by a heating device capable of heating air, the heating device includes a heating box 5A fixedly installed on the air supply device 2A and an electric heating pipe 6A arranged in the heating box 5A, an output end of the heating box 5A is connected with an output end of the air delivery pipe 3A, and an input end is connected with an output end of the air supply device 2A. The heating equipment can heat the air output by the air supply equipment 2A, and the phenomenon that the blowing quality is influenced by the supercooling of the temperature of the air column is avoided.

The above description is only the preferred embodiment of the present invention, and the technical solutions of the objects of the present invention are all within the protection scope of the present invention as long as the objects are achieved by the substantially same means.

Claims

1. Be applied to gas column structure that looses on biaxial stretching cavity blow molding mould, including the mould body, the mould body is including the preceding mould and the back mould that surround into the die cavity, be located the die cavity bottom die block, be used for installing the die block's die block board and stretch into the tensile pole in the die cavity from the die cavity top, be equipped with bearing mechanism in the die cavity, bearing mechanism includes that bottom bar and drive bottom bar stretch into the actuating mechanism at die cavity middle part, its characterized in that: the utility model discloses a mould, including the die body, the die body is equipped with the die cavity, the die cavity is equipped with the gas column passageway that can form the gas column in the die cavity and support bottle base bottom center with the bearing, the die cavity is connected with the air feed mechanism who inputs gas for the gas column passageway, air feed mechanism is located the outer one end of die cavity with the die cavity and is connected, be equipped with in the die cavity and discharge the air structure outside the die cavity, the air structure including locate on the die body and feed through outside exhaust hole, locate the exhaust gap between preceding die and the back die, the both sides in exhaust gap respectively with the exhaust hole with the die cavity intercommunication.

2. The air column dispersing structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: the exhaust structure is characterized by further comprising an exhaust port arranged at one end of the bottom rod outside the die cavity, one end of the exhaust port is communicated with the bottom of the gas column channel, the other end of the exhaust port is connected with an exhaust pipe, and an electric control valve used for opening and closing an output end of the exhaust pipe is arranged at an output end of the exhaust pipe.

3. The air column dispersing structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: the bottom die is provided with a through hole, the bottom rod penetrates into the die cavity from the through hole, and the driving mechanism is installed on the outer side of the bottom die.

4. The air column dispersing structure applied to the biaxially oriented hollow blow molding mold according to claim 3, wherein: the exhaust structure is characterized by further comprising a plurality of exhaust grooves arranged in the through holes, the exhaust grooves extend along the axis direction of the through holes, and two ends of each exhaust groove are communicated with the inside of the mold cavity and the outside of the mold body respectively.

5. The air column dispersing structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: the air supply mechanism comprises air supply equipment, and the air supply equipment is communicated with the input end of the air column channel through an air conveying pipe.

6. The air column dispersing structure applied to the biaxially oriented hollow blow molding mold according to any one of claims 1 to 5, wherein: the gas column passageway includes from supreme lower direct current section, the section of gathering a class, the last direct current section that communicates in proper order down, the outside of sill bar is equipped with the air inlet of communicating lower direct current section, direct current section passes through air inlet and air feed mechanism's output intercommunication down, the output and the die cavity intercommunication of going up direct current section.

7. The air column dispersing structure applied to the biaxially oriented hollow blow molding mold according to claim 6, wherein: the flow gathering section is of a tapered structure with the diameter gradually reduced from bottom to top.

8. The air column dispersing structure applied to the biaxially oriented hollow blow molding mold according to claim 7, wherein: the lower direct current section and the upper direct current section are of straight-through structures with the same diameter from bottom to top.