CN215095555U

CN215095555U - Bottom rod circular truncated cone-shaped structure applied to bidirectional stretching hollow blow molding mold

Info

Publication number: CN215095555U
Application number: CN202120856529.9U
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: 2021-04-24
Filing date: 2021-04-24
Publication date: 2021-12-10
Anticipated expiration: 2031-04-24

Abstract

The bottom rod circular truncated cone-shaped structure applied to the bidirectional stretching hollow blow molding forming die comprises two die half bodies which are arranged in a mirror symmetry mode and surround a die cavity, a bottom die positioned at the bottom of the die cavity and a bottom die base used for tightly fastening and mounting the bottom die, the bottom of the bottom die holder is provided with an electric telescopic cylinder, the telescopic end of the electric telescopic cylinder is connected with a bottom rod, a flexible supporting head is arranged at the top of the bottom rod, in the blow molding process, the air is uniformly discharged from the air equalizing holes on the side wall of the flexible support head, so that the material at the bottom of the bottle blank can be blown away by the air discharged from the air equalizing holes when the material at the bottom of the bottle blank is close to the bottom rod and further tends to wrap the bottom rod in the blow molding process, the wind power surrounding the periphery of the bottom rod is formed outside the bottom rod, so that the bottle blank bottom material cannot be close to the bottom rod, the effect of preventing the rod from being wrapped is achieved, and the forming of the bottle blank bottom structure is facilitated.

Description

Bottom rod circular truncated cone-shaped structure applied to bidirectional stretching hollow blow molding mold

Technical Field

The utility model belongs to the technical field of the blow molding mould, concretely relates to be applied to sill bar round platform column 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.

The present invention provides an axial bidirectional positioning stretch hollow blow molding method in the chinese patent application No. 201811527312.2 by the applicant, which can sufficiently stretch the material at the bottom of the bottle blank through the support at the middle part, and more uniformly distribute the material at the bottom of the bottle, thereby obtaining better cooling and shaping. Because of obtaining abundant tensile, not only can reduce the internal stress at the bottom of the bottle, reduce the probability that bursts, but also can alleviate the weight of bottom material, reach the effect that reduces the gram weight, but current blow molding mould is realizing above-mentioned function and carrying out the blow molding in-process, has bottom material parcel sill bar to influence product shaping quality and drawing of patterns difficulty scheduling problem, consequently needs to improve current forming die.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a bottom rod round platform column structure applied to the bidirectional stretching hollow blow molding mould.

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

the bottom rod circular truncated cone-shaped structure applied to the bidirectional stretching hollow blow molding forming die comprises two die half bodies which are arranged in a mirror symmetry mode and surround a die cavity, a bottom die located at the bottom of the die cavity and a bottom die base used for tightly fastening and installing the bottom die, wherein an electric telescopic cylinder is arranged at the bottom of the bottom die base, a bottom rod is connected to the telescopic end of the electric telescopic cylinder, a flexible support head is installed at the top end of the bottom rod and is of a circular truncated cone-shaped structure, a plurality of air equalizing holes are formed in the side wall of the flexible support head, the bottom rod is of a hollow structure, a ventilation channel penetrating through the bottom rod along the direction of a central axis is formed in the bottom rod, the ventilation channel is communicated with the air equalizing holes, an air inlet communicated with the ventilation channel is formed in the bottom of the side wall of the bottom rod, the air inlet is connected with an air device introducing an air source into the ventilation channel, and the bottom rod penetrates through the bottom die base and the bottom die and extends into the die cavity, the bottom rod and the electric telescopic cylinder extend and retract along the central axis direction of the die cavity.

As the utility model discloses further improvement, the flexible end department of electronic telescoping cylinder is equipped with the double-screw bolt of being connected with the sill bar, the internal thread of being connected with the double-screw bolt cooperation is seted up to ventilation channel's bottom, the lateral wall passes through the thread bush and is connected between electronic telescoping cylinder and the sill bar, the thread bush is absorbed in the flexible end of electronic telescoping cylinder and the lateral wall of sill bar, and the external diameter of thread bush equals with the flexible end external diameter of electronic telescoping cylinder, sill bar external diameter.

As a further improvement, the air inlet device includes the first inlet air channel that air compressor, one end and air compressor are connected and the second inlet air channel who is connected with the first inlet air channel other end, the vertical seting up in the die block of second inlet air channel, second inlet air channel sets up the one side at the sill bar, second inlet air channel and air intake intercommunication, the air intake reciprocates in one side of second inlet air channel along with the sill bar.

As the utility model discloses further improvement, fitting surface between die block and the die block seat is equipped with the sealing ring that is used for carrying out sealing treatment to second inlet air duct, the sealing ring encircles second inlet air duct's periphery setting.

As a further improvement, the bottom die is internally provided with a linear bearing which is used for guiding the bottom rod in a matched manner, and the linear bearing is sleeved on the outer side wall of the bottom rod.

As a further improvement, the electric telescopic cylinder is a servo electric cylinder.

As a further improvement, the bottom structure of the flexible supporting head and the structure of the central part of the inner wall of the bottom die are adapted to each other, and when the flexible supporting head falls to the bottom, the air equalizing head is attached to the bottom die.

As a further improvement, the length of the second air inlet channel is larger than the stroke of the electric telescopic cylinder.

As a further improvement, a plurality of exhaust holes for exhausting the gas in the mold cavity are arranged in the mold half body.

As the utility model discloses further improvement, be equipped with the baroceptor that a plurality of is used for detecting the inside atmospheric pressure value of die cavity in the mould body, baroceptor is absorbed in this internal installation of mould, baroceptor's response face is to the die cavity.

The utility model has the advantages that: the utility model discloses a set up the flexible support head at the top of sill bar, in the blowing process, through the even exhaust gas of the wind hole from flexible support head lateral wall, make bottle base bottom material in the blow molding process, bottle base bottom material is close to the sill bar and further when tending to the sill bar parcel sill bar, can blow off bottle base bottom material through the combustion gas in the wind hole, form a wind-force around its periphery in the outside of sill bar, make bottle base bottom material unable to be close to the sill bar, thus play and prevent the effect of wrapping the pole, more be favorable to the shaping of bottle base bottom structure; in addition, the installation and the replacement of the supporting head can be more convenient by utilizing the flexibility of the flexible supporting head, and the demolding of the bottom of the bottle blank is also facilitated.

Drawings

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

FIG. 1 is a schematic structural view of the bottom rod of the present embodiment when retracted to the lowest position;

FIG. 2 is a schematic structural view of the bottom rod of the present embodiment when it extends to the highest position;

FIG. 3 is a schematic structural view of the bottom rod of the present embodiment extending between the lowest position and the highest position;

FIG. 4 is a schematic view of the bottom bar ventilation structure of the present embodiment;

FIG. 5 is a schematic view of an installation structure of the joint between the bottom rod and the electric telescopic cylinder in this embodiment;

fig. 6 is a schematic diagram of electric signal control and air circuit connection of the air intake device of the present embodiment.

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.

Example (b):

as shown in fig. 1 to 6, the embodiment discloses a circular truncated cone-shaped structure of a bottom rod applied to a biaxially oriented hollow blow molding mold, which includes two mold half bodies 2 arranged in mirror symmetry to surround a mold cavity 1, a bottom mold 3 located at the bottom of the mold cavity 1, and a bottom mold base 4 for tightly fastening and installing the bottom mold 3, wherein an electric telescopic cylinder 5 is arranged at the bottom of the bottom mold base 4, a bottom rod 6 is connected to a telescopic end of the electric telescopic cylinder 5, a flexible support head 7 is installed at the top end of the bottom rod 6, the flexible support head 7 is a circular truncated cone-shaped structure, a plurality of air equalizing holes are formed in a side wall of the flexible support head 7, the bottom rod 6 is of a hollow structure, a ventilation channel 61 penetrating through the bottom rod 6 along a central axis direction is formed in the bottom rod 6, the ventilation channel 61 is communicated with the air equalizing holes, an air inlet 62 communicated with the ventilation channel 61 is formed in the bottom of the side wall of the bottom rod 6, air intake 62 is connected with the hot blast blowpipe apparatus 8 that lets in the wind regime in to ventilation passageway 61, bottom bar 6 passes in die block seat 4 and die block 3 extend to die cavity 1, the flexible direction of bottom bar 6 and electronic telescoping cylinder 5 is flexible along the axis direction of die cavity 1. The top of the bottom rod 6 is provided with the flexible supporting head 7, and in the blow molding process, gas is uniformly discharged from the uniform air holes in the side wall of the flexible supporting head 7, so that the bottom material of the bottle blank is blown away by the gas discharged from the uniform air holes when the bottom material of the bottle blank is close to the bottom rod 6 and further tends to the bottom rod 6 to wrap the bottom rod 6 in the blow molding process, and a wind force surrounding the periphery of the bottom rod 6 is formed outside the bottom rod 6, so that the bottom material of the bottle blank cannot be close to the bottom rod 6, the effect of preventing the bottle blank from wrapping the rod is achieved, and the molding of the bottom structure of the bottle blank is facilitated; in addition, the flexibility of the flexible supporting head 7 is utilized, so that the supporting head can be mounted and replaced more conveniently, and the demolding of the bottom of the bottle blank is facilitated.

In this embodiment, in order to stabilize stability and convenience that electronic telescoping cylinder 5 and sill bar 6 are connected, the flexible end department of electronic telescoping cylinder 5 is equipped with the double-screw bolt of being connected with sill bar 6, the internal thread of being connected with the double-screw bolt cooperation is seted up to ventilation channel 61's bottom, the lateral wall passes through thread bush 9 and is connected between electronic telescoping cylinder 5 and the sill bar 6, thread bush 9 is absorbed in the flexible end of electronic telescoping cylinder 5 and the lateral wall of sill bar 6, and the external diameter of thread bush 9 equals with the flexible end external diameter of electronic telescoping cylinder 5, sill bar 6 external diameter. During processing, set up certain length internal thread bottom the ventilation passageway 61 of sill bar 6, then at the flexible end top processing screw thread post of electronic telescoping cylinder 5, the while is at the outside wall of the flexible end of sill bar 6 bottom and electronic telescoping cylinder 5 inside sunken external screw thread of processing certain degree of depth, during the installation, to twisting 6 outer walls of sill bar with thread bush 9, then together with the flexible end threaded connection of electronic telescoping cylinder 5 with sill bar 6 and thread bush 9 to accomplish installation between them.

In this embodiment, the air intake device 8 includes the first inlet air duct 82 that air compressor 81, one end are connected with air compressor 81 and the second inlet air duct 83 that is connected with the first inlet air duct 82 other end, the vertical seting up of second inlet air duct 83 is in the die holder 4, the one side at sill bar 6 is seted up to second inlet air duct 83, second inlet air duct 83 and air intake 62 intercommunication, air intake 62 reciprocates in one side of second inlet air duct 83 along with sill bar 6. Through setting up hot blast blowpipe apparatus 8 for this structure to make the bottom bar 6 elevating movement in-process, make air intake 62 and second inlet air channel 83 keep the state of intercommunication all the time, thereby make hot blast blowpipe apparatus 8 can continuously provide the wind regime for flexible support head 7, realize the air feed. In order to improve the lifting stability of the bottom rod 6, a sleeve can be further arranged in a hole position in the bottom die base 4 corresponding to the position where the bottom rod 6 can move up and down, the bottom rod 6 is sleeved in the sleeve, a through groove is formed in one side, close to the second air inlet channel 83, of the sleeve, and an air source of the second air inlet channel 83 enters the ventilation channel 61 after passing through the through groove and the air inlet 62 in sequence.

In this embodiment, in order to improve the leakproofness of second inlet air channel 83, prevent that the wind of second inlet air channel 83 from revealing in the installation gap between die block 3 and the die block seat 4, the fitting surface between die block 3 and the die block seat 4 is equipped with the sealing ring 10 that is used for carrying out sealing treatment to second inlet air channel 83, sealing ring 10 encircles the periphery setting of second inlet air channel 83 to make the tip of second inlet air channel 83 blocked by die block 3, and the periphery of second inlet air channel 83 is blocked by sealing ring 10, realize comprehensive sealed.

In this embodiment, in order to improve the smoothness of the bottom rod 6 during the lifting movement, a linear bearing 11 for guiding the bottom rod 6 in a matching manner is installed in the bottom die 3, and the linear bearing 11 is sleeved on the outer side wall of the bottom rod 6. The electric telescopic cylinder 5 is a servo electric cylinder. The bottom structure of the flexible supporting head 7 is matched with the structure of the central part of the inner wall of the bottom die 3, and when the flexible supporting head 7 falls to the bottom, the air equalizing head is attached to the bottom die 3. The length of the second air intake channel 83 is greater than the stroke of the electric telescopic cylinder 5.

In the present embodiment, the mold half 2 has a plurality of vent holes 21 opened therein for venting the gas in the cavity 1. The mould is characterized in that a plurality of air pressure sensors for detecting air pressure values in the mould cavity 1 are arranged in the mould body, the air pressure sensors are arranged in the mould body in a sunk mode, and the sensing surfaces of the air pressure sensors face the inside of the mould cavity 1. Atmospheric pressure sensor can install in exhaust hole 21 wherein, be connected with mould blowing control system through the signal of telecommunication, realize signal feedback's effect, mould blowing control system carries out hot blast blowpipe apparatus 8 control through atmospheric pressure sensor feedback atmospheric pressure value signal, thereby realize closed-loop control, it is more accurate to make the control of blowing, improve the fashioned quality of bottle base, set up normally closed solenoid valve and one-way flow control valve in hot blast blowpipe apparatus 8's air outlet department simultaneously, mould blowing control system controls hot blast blowpipe apparatus 8 air supplies through cooperating normally closed solenoid valve and one-way flow control valve.

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 sill bar round platform column structure on biaxial stretching cavity blow molding mould, set up two mould halfbodies that surround the die cavity including mirror symmetry, be located the die cavity bottom the die cavity and be used for the die holder of straining installation die cavity, its characterized in that: the bottom of die holder is equipped with electronic telescoping cylinder, the flexible end of electronic telescoping cylinder is connected with the sill bar, flexible support head is installed on the top of sill bar, flexible support head is round platform column structure, the equal wind hole of a plurality of has been seted up to the lateral wall of flexible support head, the sill bar is hollow structure, set up the ventilation passageway that runs through the sill bar along the axis direction in the sill bar, ventilation passageway and equal wind hole intercommunication, the lateral wall bottom of sill bar has been seted up and has been linked to ventilation passageway's air intake, the air intake connection lets in the hot blast blowpipe of wind regime in to ventilation passageway, the sill bar passes die holder and die block and extends to the die cavity, the flexible direction of sill bar and electronic telescoping cylinder is flexible along the axis direction of die cavity.

2. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: the telescopic end department of electronic telescoping cylinder is equipped with the double-screw bolt of being connected with the sill bar, the internal thread of being connected with the double-screw bolt cooperation is seted up to ventilation passageway's bottom, the lateral wall passes through the thread bush and is connected between electronic telescoping cylinder and the sill bar, the thread bush is absorbed in the flexible end of electronic telescoping cylinder and the lateral wall of sill bar, and the external diameter of thread bush equals with the flexible end external diameter of electronic telescoping cylinder, sill bar external diameter.

3. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: the air inlet device comprises a first air inlet channel and a second air inlet channel, wherein the first air inlet channel is connected with the air compressor at one end, the second air inlet channel is connected with the other end of the first air inlet channel, the second air inlet channel is vertically arranged in the base seat, the second air inlet channel is arranged on one side of the bottom rod, the second air inlet channel is communicated with the air inlet, and the air inlet moves up and down along with the bottom rod on one side of the second air inlet channel.

4. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 3, wherein: the fitting surface between die block and the die block seat is equipped with the sealing ring that is used for carrying out sealing treatment to second inlet air duct, the periphery setting that the second inlet air duct is encircleed to the sealing ring.

5. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: and a linear bearing used for guiding the bottom rod in a matched manner is arranged in the bottom die, and the linear bearing is sleeved on the outer side wall of the bottom rod.

6. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: the electric telescopic cylinder is a servo electric cylinder.

7. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: the bottom structure of the flexible supporting head is matched with the structure of the central part of the inner wall of the bottom die, and when the flexible supporting head falls to the bottom, the flexible supporting head is attached to the bottom die.

8. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 3, wherein: and the length of the second air inlet channel is greater than the stroke of the electric telescopic cylinder.

9. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 1, wherein: and a plurality of exhaust holes for exhausting gas in the die cavity are formed in the die half body.

10. The bottom rod truncated cone-shaped structure applied to the biaxially oriented hollow blow molding die according to claim 9, wherein: the mould is characterized in that a plurality of air pressure sensors for detecting air pressure values in the mould cavity are arranged in the mould body, the air pressure sensors are arranged in the mould body in a sunk mode, and the sensing surfaces of the air pressure sensors face towards the inside of the mould cavity.