CN215040178U

CN215040178U - Stretching rod pre-blowing device applied to hollow blow molding mold

Info

Publication number: CN215040178U
Application number: CN202120955490.6U
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: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-12-07
Anticipated expiration: 2031-05-06

Abstract

Be applied to tensile pole pre-blowing device on cavity blow molding mould, including the die cavity body, install the die block in die cavity body bottom, install the supporting mechanism in the die block bottom and install the stretching mechanism that blows at the die cavity body top, the stretching mechanism that blows including the mechanism that blows in gas and the stretching mechanism that is used for following the axial direction with the bottle base in the bottle base, stretching mechanism includes tensile pole and the elevating gear who is used for driving tensile pole to reciprocate, the middle part of tensile pole is equipped with first inlet channel along axial extension, tensile pole is close to elevating gear's one end shutoff, the one end that elevating gear was kept away from to tensile pole is equipped with the venthole, the air inlet with the mechanism intercommunication of blowing is seted up to the lateral wall of tensile pole, the utility model discloses a cover the equal wind net of one deck in the periphery at the venthole, make the air-out of exhaust vent more even, the effect of pre-blowing is enhanced.

Description

Stretching rod pre-blowing device applied to 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 tensile pole pre-blowing device on 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 of bursting, but also can alleviate the weight of bottom material, reach the effect that reduces gram weight, but present blow molding mould is realizing that above-mentioned function carries out the blow molding in-process, and it is comparatively difficult to the installation dismantlement of stretching rod, need consume more reloading time, seriously influences the normal work of whole production line.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a stretching rod pre-blowing device applied to a hollow blow molding mold.

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

a pre-blowing device of a stretching rod applied to a hollow blow molding mold comprises a mold cavity body, a bottom mold arranged at the bottom of the mold cavity body, a supporting mechanism arranged at the bottom of the bottom mold and a blowing stretching mechanism arranged at the top of the mold cavity body, the blowing and stretching mechanism comprises a blowing mechanism for blowing gas into the bottle blank and a stretching mechanism for stretching the bottle blank along the axial direction, the stretching mechanism comprises a stretching rod and a lifting device for driving the stretching rod to move up and down, the middle part of the stretching rod is provided with a first air inlet channel in an extending way along the axial direction, one end of the stretching rod close to the lifting device is blocked, one end of the stretching rod far away from the lifting device is provided with an air outlet hole, the side wall of the stretching rod is provided with an air inlet communicated with the air blowing mechanism, the periphery of the air outlet is covered with a layer of air equalizing net, and the stretching rod is connected with the lifting device through a convenient dismounting structure.

As the utility model discloses further improvement, portable dismouting structure is including fixing the connector at the flexible end of elevating gear, being used for the locking piece with connector and tensile pole locking and being used for controlling the reset spring that resets after the action of locking piece, reset spring installs the medial extremity at the locking piece, be equipped with the mounting hole that is used for inserting the tensile pole of installation in the connector, offer first slot and the second slot that is used for the cooperation to insert the locking piece in connector and the tensile pole respectively, be equipped with the unlocking groove that is used for removing locking state with connector and tensile pole in the locking piece.

As a further improvement, the mechanism of blowing includes the mount pad and the switching mechanism that admits air, the switching mechanism that admits air is installed in the mount pad top, be equipped with the second inlet channel with the bottleneck intercommunication of die cavity body in the mount pad, be equipped with the third inlet channel and the fourth inlet channel with first inlet channel and second inlet channel intercommunication respectively among the switching mechanism that admits air, be equipped with the interface that admits air that is used for connecting the air supply among the switching mechanism that admits air and be used for switching the switching valve of interface and third inlet channel or fourth inlet channel break-make that admits air.

As a further improvement, the stretching mechanism is still including the crane that is used for installing elevating gear, the crane includes the lift guide pillar and installs at lift guide pillar top lift platform, lift guide pillar bottom mounting is on the switching mechanism that admits air, lift platform and admit air and be equipped with the elastic sleeve between the switching mechanism, the one end of elastic sleeve is connected with the switching mechanism that admits air and is fed through with the third inlet channel, the elastic sleeve's the other end is connected with lift platform, stretching pole is from last to passing elastic sleeve, the switching mechanism that admits air and fourth inlet channel in proper order down and extending to the die cavity originally internally.

As the utility model discloses further improvement, the switching valve is connected with valve control motor, switches the valve action through valve control motor control.

As a further improvement of the present invention, the elastic sleeve is a bellows.

The utility model has the advantages that: the utility model has the advantages that the air outlet holes are more uniformly exhausted by covering the air equalizing net at the periphery of the air outlet holes, so that the pre-blowing effect is enhanced; in addition, the stretching rod is connected with the lifting device through a convenient dismounting structure, so that the stretching rod is convenient to replace, the replacing time is shortened, and the normal operation of a production line is ensured; set up first inlet channel in the tensile pole in this outside, set up the venthole in the bottom of tensile pole, the utility model discloses a tensile pole is at the in-process of blowing in advance, moves the axial stretch bottle base in its to the bottle base through elevating gear drive, simultaneously through the first inlet channel air feed of blowing mechanism to tensile pole to make tensile pole stretch in stretching into the bottle base in can be to the gas of blowing in advance in the bottle base, thereby make the bottle base material obtain even expansion at tensile in-process, thereby ensure that the shaping product wall thickness is even, improve product quality.

Drawings

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

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a cross-sectional view of section A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of the blowing and stretching mechanism of the present embodiment;

FIG. 4 is a schematic structural view of the locking member of the present embodiment in a locked state;

FIG. 5 is a schematic structural view of the locking member of the present embodiment in an unlocked state;

fig. 6 is a schematic structural diagram of the portable detachable structure of the 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 stretching rod pre-blowing device applied to a hollow blow molding mold, which includes a mold cavity body 1, a bottom mold 2 installed at the bottom of the mold cavity body 1, a supporting mechanism 3 installed at the bottom of the bottom mold 2, and a blowing stretching mechanism 4 installed at the top of the mold cavity body 1, where the blowing stretching mechanism 4 includes a blowing mechanism 41 for blowing gas into a bottle blank and a stretching mechanism 42 for stretching the bottle blank in an axial direction, the stretching mechanism 42 includes a stretching rod 421 and a lifting device 422 for driving the stretching rod 421 to move up and down, a first gas inlet passage 4211 is provided in the middle of the stretching rod 421 in an axial direction, one end of the stretching rod 421 close to the lifting device 422 is sealed, one end of the stretching rod 421 far away from the lifting device 422 is provided with a gas outlet, a side wall of the stretching rod 421 is provided with a gas inlet 4212 communicated with the blowing mechanism 41, the periphery of venthole covers there is the equal wind net of one deck, adopt portable dismouting structural connection between tensile pole 421 and the elevating gear 422. The air outlet holes are covered with the air equalizing net layer, so that air outlet of the air outlet holes is more uniform, and the pre-blowing effect is enhanced; in addition, the stretching rod 421 is connected with the lifting device 422 through a convenient dismounting structure, so that the replacement of the stretching rod 421 is more convenient, the replacement time is shortened, and the normal operation of a production line is ensured; in addition through setting up first inlet channel 4211 in tensile pole 421, set up the venthole in the bottom of tensile pole 421, the utility model discloses a tensile pole 421 is at the blowing in-process in advance, moves axial tension bottle base in its to the bottle base through elevating gear 422 drive, simultaneously through the air feed of air blowing mechanism 41 to the first inlet channel 4211 of tensile pole 421 to make tensile pole 421 can be to the gas of blowing in advance in the bottle base when stretching into in the bottle base, thereby make the bottle base material obtain even expansion at tensile in-process, thereby ensure that the shaping product wall thickness is even, improve product quality.

As a preferred embodiment, the portable dismounting structure includes a connecting head 51 fixed at the telescopic end of the lifting device 422, a locking member 52 for locking the connecting head 51 and the stretching rod 421, and a return spring 53 for controlling the return of the locking member 52 after the movement, wherein the return spring 53 is installed at the inner side end of the locking member 52, an installation hole 511 for inserting and installing the stretching rod 421 is formed in the connecting head 51, a first insertion slot 512 and a second insertion slot 4213 for inserting the locking member 52 in a matching manner are respectively formed in the connecting head 51 and the stretching rod 421, and an unlocking slot 521 for unlocking the connecting head 51 and the stretching rod 421 is formed in the locking member 52. When the stretching rod 421 is disassembled, the locking member 52 is only required to be pressed into the first slot 512, so that the second slot 4213 of the stretching rod 421 is aligned with the unlocking slot 521 of the locking member 52, and the stretching rod 421 can be pulled out from the mounting hole 511, thereby completing the disassembling operation of the stretching rod 421; when the stretching rod 421 is installed, the stretching rod 421 is only inserted into the installation hole 511, the first slot 512 and the second slot 4213 are aligned to form an insertion space, the locking member 52 is inserted into the insertion space until the end portion abuts against the return spring 53, and at this time, the unlocking groove 521 of the locking member 52 and the second slot 4213 of the stretching rod 421 are dislocated, so that the stretching rod 421 is locked in the connecting head 51, and the installation work of the stretching rod 421 is completed.

In a preferred embodiment, the air blowing mechanism 41 includes a mounting seat 411 and an air inlet switching mechanism 412, the air inlet switching mechanism 412 is mounted above the mounting seat 411, a second air inlet passage 413 communicated with a mouth of the cavity body 1 is arranged in the mounting seat 411, a third air inlet passage 4121 and a fourth air inlet passage 4122 respectively communicated with the first air inlet passage 4211 and the second air inlet passage 413 are arranged in the air inlet switching mechanism 412, and an air inlet interface 4123 for connecting an air source and a switching valve 4124 for switching on and off of the air inlet interface 4123 and the third air inlet passage 4121 or the fourth air inlet passage 4122 are arranged in the air inlet switching mechanism 412. The stretching mechanism 42 further comprises a lifting frame 423 for installing the lifting device 422, the lifting frame 423 comprises a lifting guide post 4231 and a lifting platform 4232 installed on the top of the lifting guide post 4231, the bottom end of the lifting guide post 4231 is fixed on the air inlet switching mechanism 412, an elastic sleeve 4233 is arranged between the lifting platform 4232 and the air inlet switching mechanism 412, one end of the elastic sleeve 4233 is connected with the air inlet switching mechanism 412 and communicated with the third air inlet channel 4121, the other end of the elastic sleeve 4233 is connected with the lifting platform 4232, and the stretching rod 421 sequentially penetrates through the elastic sleeve 4233, the air inlet switching mechanism and the fourth air inlet channel 4122 from top to bottom to extend into the mold cavity body 1. The blowing mechanism 41 in this embodiment controls the communication of the gas path through the gas inlet switching mechanism 412, when the switching valve 4124 is switched to the gas inlet 4123 to communicate with the third gas inlet channel 4121, the gas inlet 4123 and the fourth gas inlet channel 4122 are cut off, and the gas passes through the gas inlet 4123, the third gas inlet channel 4121, the elastic sleeve 4233 and the first gas inlet channel 4211 in sequence, and is finally discharged from the gas outlet hole into the bottle blank to form the pre-blowing gas path. After the bottle blank stretching pre-blowing is completed, the air inlet switching mechanism 412 acts, the switching valve 4124 is switched to the air inlet port 4123 to be communicated with the fourth air inlet channel 4122, the air inlet port 4123 is cut off from the third air inlet channel 4121, air sequentially passes through the air inlet port 4123, the fourth air inlet channel 4122 and the second air inlet channel 413, and finally enters the bottle blank from the bottle blank opening to form a bottle blowing air path.

In a preferred embodiment, a valve control motor 4125 is connected to the switching valve 4124, and the operation of the switching valve 4124 is controlled by the valve control motor 4125. The elastic sleeve 4233 is a corrugated pipe. The air inlet 4212 is provided at an upper portion of the stretching rod 421. The connecting end of the second air inlet passage 413 and the die cavity body 1 is matched with the opening size of the bottle mouth. The elastic tube 4233 of the present embodiment expands and contracts with the ascending and descending of the stretching rod 421, so that the elastic tube 4233 is always communicated with the first air inlet passage 4211.

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 tensile pole pre-blowing device on cavity blow molding mould, including the die cavity body, install die block in die cavity body bottom, install the bearing mechanism in the die block bottom and install the stretching mechanism that blows at the die cavity body top, its characterized in that: the stretching mechanism blows in gas including being used for blowing in gaseous mechanism and being used for the stretching mechanism of bottle base along axial direction in the bottle base, stretching mechanism is including tensile pole and the elevating gear who is used for the drive tensile pole to reciprocate, the middle part of tensile pole is equipped with first inlet channel along axial extension, the one end shutoff that elevating gear is close to tensile pole, the one end that elevating gear was kept away from to tensile pole is equipped with the venthole, the air inlet with blowing mechanism intercommunication is seted up to the lateral wall of tensile pole, the periphery of venthole covers there is the equal wind net of one deck, adopt portable dismouting structural connection between tensile pole and the elevating gear.

2. The stretch rod pre-blowing apparatus applied to a hollow blow molding die as claimed in claim 1, wherein: portable dismouting structure is including fixing the connector at the flexible end of elevating gear, being used for the locking piece with connector and tensile pole locking and being used for controlling the reset spring that resets after the locking piece action, reset spring installs the medial extremity at the locking piece, be equipped with the mounting hole that is used for inserting the tensile pole of installation in the connector, offer respectively in connector and the tensile pole and be used for the cooperation to insert first slot and the second slot of locking piece, be equipped with the unlocking groove that is used for removing locking state with connector and tensile pole in the locking piece.

3. The stretch rod pre-blowing apparatus applied to a hollow blow molding die as claimed in claim 1, wherein: the blowing mechanism comprises a mounting seat and an air inlet switching mechanism, the air inlet switching mechanism is mounted above the mounting seat, a second air inlet channel communicated with a bottle opening of the die cavity body is arranged in the mounting seat, a third air inlet channel and a fourth air inlet channel communicated with the first air inlet channel and the second air inlet channel respectively are arranged in the air inlet switching mechanism, and an air inlet interface used for connecting an air source and a switching valve used for switching the on-off state of the air inlet interface and the third air inlet channel or the fourth air inlet channel are arranged in the air inlet switching mechanism.

4. The stretch rod pre-blowing apparatus applied to a hollow blow molding die according to claim 3, characterized in that: the stretching mechanism further comprises a lifting frame used for installing a lifting device, the lifting frame comprises a lifting guide pillar and a lifting platform arranged on the top of the lifting guide pillar, the bottom end of the lifting guide pillar is fixed on the air inlet switching mechanism, an elastic sleeve is arranged between the lifting platform and the air inlet switching mechanism, one end of the elastic sleeve is connected with the air inlet switching mechanism and communicated with a third air inlet channel, the other end of the elastic sleeve is connected with the lifting platform, and the stretching rod sequentially penetrates through the elastic sleeve, the air inlet switching mechanism and a fourth air inlet channel from top to bottom and extends into the die cavity body.

5. The stretch rod pre-blowing apparatus applied to a hollow blow molding die according to claim 3, characterized in that: the switching valve is connected with a valve control motor and controls the switching valve to act through the valve control motor.

6. The stretch rod pre-blowing apparatus applied to a hollow blow molding die according to claim 4, wherein: the elastic sleeve is a corrugated pipe.