CN214645795U

CN214645795U - Bottom die blowing supporting structure applied to bidirectional stretching hollow blow molding mold

Info

Publication number: CN214645795U
Application number: CN202120499847.4U
Authority: CN
Inventors: 谢国基; 姜晓平; 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: 2021-11-09
Anticipated expiration: 2031-03-09

Abstract

Be applied to die block supporting structure that blows on biaxial stretching cavity blow molding mould, including the preceding mould and the back mould that surround into the die cavity, be located the die block of die cavity bottom, be used for installing the die block's die block board and stretch into the tensile pole of die cavity from the die cavity top, set up in the central point of die block and can form the gas column passageway that the gas column supported bottle base bottom center with the bearing in the die cavity, supreme die block that runs through is down followed to the gas column passageway, the die block outside is connected with the air feed mechanism who inputs gas for the gas column passageway, be equipped with in the die cavity and discharge the exhaust structure outside the die cavity with die cavity air. The utility model discloses a die block can be in the die cavity blowout bearing support bottle base bottom center's gas post, reaches the purpose that utilizes the gas post to replace the contact of bearing pole to support the bottle base to can cancel bearing pole, the bottom material parcel bearing pole influences product shaping quality and drawing of patterns difficulty scheduling problem behind the bottle base bottle blowing, effectively ensures bottle base bottle blowing quality and improvement drawing of patterns efficiency.

Description

Bottom die blowing supporting 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 die block bearing structure that blows 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.

Therefore, the company invents an axial bidirectional positioning stretching hollow blow molding method, and the specific technical scheme can refer to the Chinese patent application with the patent application number of 201811527312.2, and the technical scheme basically solves the technical problems. However, in the using process, the blow molding mold has the problems that the molding quality of the product is affected and the demolding is difficult due to the fact that the supporting rod is wrapped by the bottom material after the bottle blank is blown, and the like, so that the existing molding mold needs to be improved.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a bottom die air blowing supporting structure applied to a bidirectional stretching hollow blow molding mold.

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

be applied to die block supporting structure that blows on biaxial stretching cavity blow molding mould, including the preceding mould and the back mould that surround the die cavity, be located the die block of die cavity bottom, be used for installing the die block's die block board and stretch into the tensile pole of die cavity from the die cavity top, its characterized in that: the central point of die block puts and has seted up the gas column passageway that can form the gas column in the die cavity and support bottle base bottom center with the bearing, supreme die block that runs through is down followed to the gas column passageway, the die cavity outside is connected with the air feed mechanism who inputs gas for the gas column passageway, be equipped with in the die cavity and discharge the exhaust structure outside the die cavity with the die cavity intracavity air.

The utility model discloses in, the die block comprises outer die block and inner bottom die, set up on the central point of outer die block from last installing port that runs through the setting extremely down, in the installing port was located to the inner bottom die, install the actuating mechanism that the die block stretched into in the die cavity in the drive on the outside of outer die block.

In the present invention, the driving mechanism is a pneumatic cylinder, a hydraulic cylinder or a motor.

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, exhaust structure makes the exhaust hole of die cavity and outside intercommunication including locating on the die cavity inner wall.

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 bottom of interior die block is equipped with the connector of threaded connection on direct current section down.

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 die block, this gas column passageway is by air feed mechanism air feed, can spout the gas column that the bearing supported bottle base bottom center in the die cavity, so reach and utilize the gas column to replace the purpose that the contact of bearing pole supported the bottle base to can cancel the bearing pole, avoid bottle base bottle blowing back bottom material parcel bearing pole influence product shaping quality and drawing of patterns difficulty scheduling problem, effectively ensured bottle base bottle blowing quality and improvement drawing of patterns efficiency.

Drawings

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

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

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

fig. 3 is a schematic structural view of the inner bottom mold.

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 to 3, the bottom mold blowing support structure applied to the biaxially oriented hollow blow molding mold comprises a front mold 1 and a rear mold enclosing a mold cavity, a bottom mold 2 located at the bottom of the mold cavity, a bottom mold plate 3 for mounting the bottom mold 2, and a stretching rod 4 extending into the mold cavity from the top of the mold cavity. Further, set up in the central point of die block 2 and put and to form the gas column passageway 1A that gas column supported bottle base bottom center with the bearing in the die cavity, supreme die block 2 that runs through is down followed to gas column passageway 1A, the 2 outsides of die block are connected with the air feed mechanism who inputs gas for gas column passageway 1A, be equipped with in the die cavity and discharge the exhaust structure outside the die cavity with the die cavity intracavity air. The gas supply mechanism inputs gas to the gas column channel 1A and then sprays the gas column from the gas column channel 1A to support and support the center of the bottom of the bottle blank.

The using principle of the embodiment is basically the same as that of the Chinese patent application with the patent application number of 201811527312.2, and the difference is that the embodiment omits a supporting rod, when the bottle blank is stretched to a certain position, namely the original position of the supporting device, the gas supply mechanism inputs gas to the gas column channel 1A, and the gas column sprayed from the gas column channel 1A is utilized to support the center of the bottom of the bottle blank which is gradually stretched and expanded, so that the bottom of the bottle blank forms a conical bottom with high supported point and low periphery in advance; in addition, after a conical bottom is formed in advance, the stretching rod 4 stretches downwards and continues to inject air pressure into the bottle blank to expand the bottle blank, the strength and the height of the air column are gradually reduced by using the air supply mechanism while the bottle blank expands, the bottom of the bottle blank is guided to directly fall on the central position of the bottom of the mold cavity through the air column, and after the bottom of the bottle blank directly falls on the central position of the bottom of the mold cavity, the air supply mechanism stops supplying air; the preform then expands and conforms to the inner walls of the mold cavity and then cools to form the blow molded container, after which the stretch rod 4 is withdrawn and returned to its original position.

In the above structure, since there may be a problem that the support stability of the air column is insufficient when the strength and height of the air column are gradually reduced by the air supply mechanism, the following structure is also provided in the present embodiment; as shown in fig. 1 and 3, the bottom mold 2 is composed of an outer bottom mold 21 and an inner bottom mold 22, a mounting opening penetrating the outer bottom mold 21 from top to bottom is formed in the center of the outer bottom mold, the inner bottom mold 22 is formed in the mounting opening in a combined manner in the bottom mold 2, and the air column channel 1A is formed in the inner bottom mold 22. In addition, install the actuating mechanism 5 that the die block 22 stretched into the die cavity in the drive on the outside of outer die block 21, when the bottle base is tensile to a certain position, actuating mechanism 5 drive in die block 22 deviate from the installing port, enter into the die cavity and be close to the bottle base bottom certain distance, the air feed mechanism just exports gas to gas column passageway 1A to spout formation gas column by gas column passageway 1A in the die cavity and hold bottle base bottom formation awl end, when tensile pole 4 continues down tensile, actuating mechanism 5 drives in the die block 22 and resets. In the mode, the strength and the height of the gas column do not need to be changed in the working process, so that the gas column can keep a stable supporting state to ensure the bottle blowing quality; and the air after the air column distributes can outwards be discharged from the installing port, effectively improves the exhaust efficiency of die cavity.

In this embodiment, actuating mechanism 5 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, the driving mechanism 5 is connected with the outer bottom die 21 through a plurality of connecting rods 6, the connecting rods 6 pass through the empty positions of the bottom die plate 3 to be connected with the driving mechanism 5, the connecting rods 6 are enclosed to form a hollow driving mechanism mounting bracket, and the driving mechanism 5 is separated from the outer bottom die 21 through the driving mechanism mounting bracket, so that the driving mechanism 5 is convenient to mount, mutual influence is avoided, and the service life is prolonged. In addition, be connected through the drive seat between actuating mechanism 5's the flexible end and the interior die 22, the drive seat has four pillars 7 of being connected with interior die 22 bottom, and four pillars 7 distribute along gas column passageway 1A periphery below to improve the stability of interior die 22 installation.

As a preferred embodiment, as shown in fig. 1, 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 pipe 3A; in the present embodiment, the air supply device 2A is an air compressor, and 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 2, the vent structure includes a vent hole provided on an inner wall of the cavity to communicate the cavity with the outside, and both ends of the vent hole communicate with the inside of the cavity and the outside of the cavity, respectively. 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 and then exhausted outside from the exhaust holes, so that the influence of the air in the mold cavity on the bottle blowing quality is avoided. In order to improve exhaust efficiency, exhaust structure still including locating the exhaust gap between front mould 1 and the back mould, the exhaust gap extends along vertical direction, the exhaust gap sets up with the die cavity is adjacent, the both ends in exhaust gap communicate with exhaust hole and die cavity respectively. 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.

As a preferred embodiment, the air column channel 1A includes a lower direct current section 11A, a current collecting section 12A, and an upper direct current section 13A that communicate in sequence from bottom to top, the bottom of the inner bottom die 22 is provided with a connector 5A that is screwed on the lower direct current section 11A, the output end of the air pipe 3A is connected to the connector 5A to input air to the air column channel 1A, the current collecting section 12A is used for collecting air current to the upper direct current section 13A, and then the direct current section is ejected to form an air column in the die cavity 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 6A fixedly installed on the air supply device 2A and an electric heating pipe 7A arranged in the heating box 6A, an output end of the heating box 6A 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 die block supporting structure that blows on biaxial stretching cavity blow molding mould, including the preceding mould and the back mould that surround the die cavity, be located the die block of die cavity bottom, be used for installing the die block's die block board and stretch into the tensile pole of die cavity from the die cavity top, its characterized in that: the central point of die block puts and has seted up the gas column passageway that can form the gas column in the die cavity and support bottle base bottom center with the bearing, supreme die block that runs through is down followed to the gas column passageway, the die cavity outside is connected with the air feed mechanism who inputs gas for the gas column passageway, be equipped with in the die cavity and discharge the exhaust structure outside the die cavity with the die cavity intracavity air.

2. The bottom die blowing support structure applied to the biaxially oriented hollow blow molding mold according to claim 1, wherein: the die block comprises outer die block and inner bottom die, set up the installing port that runs through the setting from last to lower on the central point of outer die block puts, inner bottom die locates in the installing port, install the actuating mechanism that the die block stretched into in the die cavity in the drive on the outside of outer die block.

3. The bottom die blowing support structure applied to the biaxially oriented hollow blow molding mold according to claim 2, wherein: the driving mechanism is a pneumatic cylinder, a hydraulic cylinder or a motor.

4. The bottom die blowing support structure applied to the biaxially oriented hollow blow molding mold 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.

5. The bottom die blowing support structure applied to the biaxially oriented hollow blow molding mold according to claim 1, wherein: the exhaust structure comprises an exhaust hole which is arranged on the inner wall of the die cavity and enables the die cavity to be communicated with the outside.

6. The bottom die blowing support structure applied to the biaxially oriented hollow blow molding mold according to claim 2, 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 bottom of interior die block is equipped with the connector of threaded connection on direct current section down.

7. The bottom die blowing support 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 bottom die blowing support 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.