CN214491563U

CN214491563U - Multi-stage air column supporting structure applied to bidirectional stretching hollow blow molding mold

Info

Publication number: CN214491563U
Application number: CN202120499846.XU
Authority: CN
Inventors: 谢国基; 姜晓平; 方英; 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 multistage gas column bearing structure on biaxial stretching cavity blow molding mould, including enclosing into the front mould and the back mould of die cavity, be located the die block of die cavity bottom, die block board and stretch into the tensile pole of die cavity from the die cavity top, the central point of die block puts and has seted up the gas column passageway, the bottom of die block is equipped with the electronic diaphragm device that is used for adjusting the gas column size, electronic diaphragm device has the gas outlet that a diameter can change, electronic diaphragm device is connected with controlling means. The utility model discloses can support the gas post at bottle base bottom center in the die cavity blowout bearing, reach the purpose that utilizes the gas post to replace the contact of bearing rod to support the bottle base, avoided bottle base bottle blowing back bottom material parcel bearing rod 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, in addition, the utility model discloses be provided with electronic diaphragm device and realize multistage gas post support, avoid holding power and effective bracing point position one and unchangeable and influence the bottle blowing quality.

Description

Multi-stage air column 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 multistage gas column bearing structure 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 be applied to the multistage gas column bearing structure on the biaxial stretching cavity blow molding mould.

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

be applied to multistage gas post bearing structure 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 cavity bottom the die cavity, 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, its characterized in that: the center position of the bottom die is provided with an air column channel which can form an air column in the die cavity to support and support the center of the bottom of the bottle blank, the air column channel penetrates through the bottom die from bottom to top, the air column channel is connected with an air supply mechanism for inputting air into the air column channel, and an exhaust structure capable of exhausting air in the die cavity outside the die cavity is arranged in the die cavity; the bottom of die block is equipped with the electronic diaphragm device that is used for adjusting the gas column size, the electronic diaphragm device has the gas outlet that a diameter can change, the gas outlet is located same axis with the gas column passageway, the gas column passageway passes through air inlet and air feed mechanism intercommunication, the electronic diaphragm device is connected with the controlling means who controls the gas outlet size according to tensile pole displacement distance.

The utility model discloses in, the mounting groove has been seted up on the bottom central point of die block puts, electronic diaphragm device is installed in the mounting groove.

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 air inlet.

The utility model discloses in, the output of gas-supply pipe is connected with and installs on electronic diaphragm device bottom and correspond the connector that communicates the air inlet.

The utility model discloses in, be equipped with first sealing washer between connector and the electronic diaphragm device.

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 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. Additionally, the utility model discloses be provided with electronic diaphragm device, electronic diaphragm device is under controlling means control, orders about the diameter of gas outlet along with the gradual grow of distance that tensile pole descends, makes the gas column grow gradually until unanimous with gas column passageway diameter to this lets the effective bracing point position and the bearing capacity of gas column reduce gradually, thereby realizes that multistage gas column supports, avoids bearing capacity and effective bracing point position one unchanged and 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 partial schematic structural view of the present embodiment;

fig. 2 is a schematic structural diagram of the electric diaphragm device.

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. 1-2, the multi-stage air column supporting structure applied to the bidirectional stretching hollow blow molding mold comprises a front mold 1 and a rear mold which surround a mold cavity, a bottom mold 2 located at the bottom of the mold cavity, a bottom mold plate 3 used for installing 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, gas column passageway 1A is connected with the air feed mechanism to its input gas, be equipped with in the die cavity and discharge the exhaust structure of die cavity intracavity air outside the die cavity.

Still further, the bottom of die block 2 is equipped with electronic diaphragm device 5 that is used for adjusting the gas column size, electronic diaphragm device 5 has the gas outlet 2A that a diameter can change, gas outlet 2A's diameter variation range is 0~8mm, gas outlet 2A is located same axis with gas column passageway 1A, the diameter of gas column passageway 1A is greater than or equal to the maximum diameter after gas outlet 2A changes, gas column passageway 1A communicates through air inlet 2A and air feed mechanism. The electric diaphragm device 5 is connected with a control device which controls the size of the air outlet 2A according to the moving distance of the stretching rod 4, and the control device is not shown in the figure; the electric diaphragm device 5 is connected with an air supply mechanism for inputting air to the air outlet 2A, and an exhaust structure capable of exhausting air in the die cavity outside the die cavity is arranged in the die cavity.

The whole using principle of the embodiment is basically the same as that of the application of Chinese patent with application number 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 through the gas inlet, 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, and the control device controls the electric diaphragm device 5 to gradually increase the diameter of the air inlet along with the expansion of the bottle blank, so that the bearing force of the air column is gradually reduced, the position of an effective supporting point is reduced, the air column is slowly led to directly drop the bottom of the bottle blank at the central position of the bottom of the mold cavity, and the air supply mechanism stops supplying air after the air column drops at the central position of the bottom of the mold cavity; 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.

As shown in fig. 2, the electric diaphragm apparatus 5 is a conventional one, and specific reference is made to chinese patent documents No. 201320524489.3 and No. 202020055145.2, and thus, it is not described in detail. In addition, the control device comprises a control module for controlling the electric diaphragm device 5 to work and a communication module for receiving the movement information of the stretching rod 4, wherein the control module is a single chip microcomputer or a PLC (programmable logic controller) and is electrically connected with the communication module; the communication module is used for being connected with a control system of the bottle blowing machine so as to acquire a moving distance signal of the stretching rod 4 and transmit the moving distance signal to the control module to control the electric diaphragm device 5 to work. And because the smaller the air outlet 2A, the thinner the formed air column is, the higher the effective supporting point position and the supporting force of the air column are, the electric diaphragm device 5 drives the diameter of the air outlet 2A to gradually increase along with the descending distance of the stretching rod 4 under the control of the control device, so that the air column gradually becomes thicker until the diameter of the air column is consistent with that of the air column channel 1A, and the effective supporting point position and the supporting force of the air column are gradually reduced, thereby realizing the multi-stage air column support and avoiding the influence on the bottle blowing quality caused by the unchanged position of the supporting force and the effective supporting point position.

In a preferred embodiment, a mounting groove is formed in the bottom center of the bottom mold 2, and the electric diaphragm device 5 is mounted in the mounting groove to prevent other components from interfering with the electric diaphragm device 5.

As a preferred embodiment, as shown in fig. 1, the air supply mechanism comprises an air supply device 3A, and the electric diaphragm device 5 is communicated with the input end of the air inlet through an air conveying pipe 4A; in this embodiment, the air supply device 3A 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, the output end of the gas pipe 4A is connected with a connector 9A installed on the bottom of the electric diaphragm device 5, and the connector 9A is correspondingly communicated with the gas inlet. In addition, in order to enhance the sealing performance, a first sealing ring is arranged between the connecting head 9A and the electric diaphragm device 5.

As a preferred embodiment, as shown in fig. 1, the exhaust structure includes an exhaust hole provided on an inner wall of the cavity to communicate the cavity with the outside, and both ends of the exhaust hole communicate with the inside of the cavity and the outside of the cavity, respectively. When the air column is used, 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 is exhausted 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 structure, an inner exhaust groove 5A and at least one outer exhaust groove 6A are arranged on the die assembly surface of the front die 1 or the rear die, and the outer exhaust grooves 6A are communicated with the inner exhaust groove 5A; when the front mold 1 and the rear mold are closed, the inner exhaust groove 5A and the closing surface of the front mold 1 or the rear mold are combined to form the exhaust gap, and the outer exhaust groove 6A and the closing surface of the front mold 1 or the rear mold are combined to form the exhaust hole.

As a preferred embodiment, as shown in fig. 1, the air delivery pipe 4A and the air supply device 3A are connected by a heating device capable of heating air, the heating device includes a heating box 7A fixedly installed on the air supply device 3A and an electric heating pipe 8A arranged in the heating box 7A, an output end of the heating box 7A is connected with an output end of the air delivery pipe 4A, and an input end is connected with an output end of the air supply device 3A. The heating equipment can heat the air output by the air supply equipment 3A, and the phenomenon that the blowing quality is influenced by the supercooling of the temperature of the air column is avoided.

In the above structure, the air supply device 3A and the electric heating tube 8A may be controlled by a control device, or may be controlled by a control system of the bottle blowing machine, and may be determined according to the needs of the user.

In a preferred embodiment, the air column channel 1A is a straight-through structure with a constant diameter, so that even if plastic waste is plugged in the air column channel 1A in the production process, air can be blown through the air inlet, the plastic waste can be quickly blown out of the air column channel 1A by the air pressure thrust of the air, and the cleaning time is shortened.

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 multistage gas post bearing structure 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 cavity bottom the die cavity, 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, its characterized in that: the center position of the bottom die is provided with an air column channel which can form an air column in the die cavity to support and support the center of the bottom of the bottle blank, the air column channel penetrates through the bottom die from bottom to top, the air column channel is connected with an air supply mechanism for inputting air into the air column channel, and an exhaust structure capable of exhausting air in the die cavity outside the die cavity is arranged in the die cavity; the bottom of die block is equipped with the electronic diaphragm device that is used for adjusting the gas column size, the electronic diaphragm device has the gas outlet that a diameter can change, the gas outlet is located same axis with the gas column passageway, the gas column passageway passes through air inlet and air feed mechanism intercommunication, the electronic diaphragm device is connected with the controlling means who controls the gas outlet size according to tensile pole displacement distance.

2. The multi-stage air column support structure applied to a biaxially oriented hollow blow molding mold according to claim 1, wherein: the bottom die is characterized in that a mounting groove is formed in the center of the bottom die, and the electric diaphragm device is mounted in the mounting groove.

3. The multi-stage air column support structure applied to a 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 inlet through an air conveying pipe.

4. The multi-stage air column support structure applied to a biaxially oriented hollow blow molding mold according to claim 3, wherein: the output end of the gas transmission pipe is connected with a connector which is arranged on the bottom of the electric diaphragm device and correspondingly communicated with the gas inlet.

5. The multi-stage air column support structure applied to the biaxially oriented hollow blow molding mold according to claim 4, wherein: and a first sealing ring is arranged between the connector and the electric diaphragm device.

6. The multi-stage air column support structure applied to a 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.