CN113263710A

CN113263710A - Production process of large barreled plastic part

Info

Publication number: CN113263710A
Application number: CN202110480871.8A
Authority: CN
Inventors: 王雨辰
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-08-17

Abstract

The invention discloses a production process of a large barreled plastic part in the field of plastic production, which mainly comprises the following steps: s1: assembling the parison on a blow pin in a blow molding apparatus; s2: starting a power supply to drive the working plate to move downwards, moving the parison to a working position and simultaneously closing the molds; s3: supplying air to the air blowing assembly to blow and mold the parison; s4: and opening the mold, cooling and demolding. The blow molding device comprises a blow mold opening and closing mechanism which is horizontally and slidably arranged on the rack and a blowing mechanism which is vertically and slidably arranged on the rack; the blowing mechanism comprises a working plate which is slidably arranged on the rack and a blowing assembly which is fixedly arranged in the center of the working plate; the blow mold opening and closing mechanism comprises a plastic mold which is slidably arranged on the rack; the connecting rod is arranged between the plastic mould and the working plate, and two ends of the connecting rod are respectively hinged with the plastic mould and the working plate.

Description

Production process of large barreled plastic part

Technical Field

The invention relates to the field of plastic production, in particular to a production process of a large barreled plastic part.

Background

Blow molding, which is mainly referred to as hollow blow molding (also called blow molding), is a method of forming a hollow article from a hot-melt parison closed in a mold by means of gas pressure, and is a plastic molding method that is developed relatively rapidly. The mold for blow molding is only a female mold (also called a female mold), and compared with injection molding, the mold has the advantages of lower equipment cost, stronger adaptability, good plasticity, and capability of molding products with complex undulating curves (or shapes), so that various blow molding equipment is frequently used for manufacturing plastic barrels in industrial production.

When the existing blow molding equipment is used for manufacturing a plastic barrel, a certain amount of softened plastic is extruded by an extruder to form a parison, the parison is placed in a cavity formed by a mold, compressed air is injected into the cavity to ensure that the plastic parison is blown to cling to the inner wall of the mold, and the plastic barrel is obtained after cooling and demolding. In the production process, when the plastic parison is blown, the plastic is in a softened state and is not easy to fix and seal due to high temperature, so that a part of blown compressed air is leaked from an outlet of the parison, and the forming rate is reduced. In addition, in the prior art, when a parison is placed in a mold, an air blowing mechanism provided with the parison is placed between two plastic molds, then the two plastic molds are closed by an air blowing mold opening and closing mechanism to be closed, and then air blowing molding is carried out. Not only does this approach consume a significant amount of time and reduce production efficiency, but the blowing mechanism and the blow mold opening and closing mechanism require different drive sources to drive, which increases production costs. Therefore, a production process of large barreled plastic parts is needed, which can simultaneously complete feeding of a forming blank and die assembly of a plastic die under the condition of ensuring sealing.

Disclosure of Invention

It is an object of the present invention to provide a subject to solve the problems of the prior art mentioned above in the background.

In order to achieve the purpose, the invention provides the following technical scheme:

a production process of large barreled plastic parts mainly comprises the following steps:

s1: assembling the parison on a blow pin in a blow molding apparatus;

s2: starting a power supply to drive the working plate to move downwards, moving the parison to a working position and simultaneously closing the molds;

s3: supplying air to the air blowing assembly to blow and mold the parison;

s4: and opening the mold, cooling and demolding.

The blow molding device comprises a blow mold opening and closing mechanism which is horizontally and slidably arranged on the rack and a blowing mechanism which is vertically and slidably arranged on the rack; the blowing mechanism comprises a working plate which is slidably arranged on the rack and a blowing assembly which is fixedly arranged in the center of the working plate; the blow mold opening and closing mechanism comprises a plastic mold which is slidably arranged on the rack; a connecting rod is arranged between the plastic mould and the working plate, and two ends of the connecting rod are respectively hinged with the plastic mould and the working plate.

When the blow molding equipment is used for manufacturing the plastic barrel, quantitative softened plastic is extruded by an extruder to form a parison, the parison is placed in a cavity formed by a mold, compressed air is injected into the cavity to ensure that the plastic parison is blown to cling to the inner wall of the mold, and the plastic barrel is obtained after cooling and demolding. In the prior art, when a parison is placed in a mold, a blowing mechanism provided with the parison is placed between two plastic molds, then a blow mold opening and closing mechanism closes the two plastic molds for mold closing, and then blowing molding is performed. Not only does this approach consume a significant amount of time and reduce production efficiency, but the blowing mechanism and the blow mold opening and closing mechanism require different drive sources to drive, which increases production costs. As shown in figure 2, the blowing assembly provided with the parison is fixed on the working plate, and the working plate slides on the frame during working and moves downwards to drive the blowing assembly provided with the parison to move to the center of the two plastic molds; and when the working plate moves downwards, the connecting rod drives the two plastic molds to move oppositely to carry out mold closing. When the working plate drives the parison to move to the working position, the two plastic molds are completely closed to form a seal. The movement of the working plate not only completes the feeding action of the blank, but also drives the plastic mould to carry out mould closing, and the feeding action and the mould closing are carried out simultaneously, thereby saving the production time, reducing a power source and improving the production efficiency. And the structure ensures that the two are stable and reliable when moving and matching with each other.

As a further scheme of the invention, the air blowing assembly comprises a hollow air blowing column and an air blowing ring provided with an air blowing opening, wherein a spiral groove and a vertical groove are formed in the outer peripheral wall of the air blowing column; the air blowing ring slides in the spiral groove and the vertical groove; a through hole is formed at the intersection of the spiral groove and the vertical groove of the air blowing column, a switching block is arranged in the through hole in a sliding manner, and the switching block slides along the radial direction of the air blowing column; the switching block has two states of a1 and a 2; a 1: the switching block seals the linear groove, and the air blowing ring slides in the spiral groove; a 2: the switching block opens the linear groove, and the air blowing ring slides in the linear groove; the bottom end of the air blowing column is rotatably provided with a rotating ring, a telescopic air blowing pipe is movably arranged on the rotating ring, and the air blowing pipe is communicated with the air blowing column and the air blowing ring;

in the actual production process, because the fixed singleness in position of blowing for the product appears like the inhomogeneous inflation that the balloon is the same, and the position thickness far away that often appears apart from the position of blowing is high, and the position thickness near apart from the position of blowing is low, and plastic drum shaping thickness is inhomogeneous, has reduced the production quality of plastic drum, leads to production facility's practicality to reduce. The existing solution is that the blowing column is rotated and slowly moved along the axis during blowing, and the blowing position is changed to make the plastic barrel uniform in forming thickness. However, this method may cause the air-blowing column to move and generate a gap between the air-blowing column and the parison, which is not sealed, and the plastic barrel forming is affected. As shown in figure 4, when the mold blowing device works, air is supplied into the air blowing column, enters the rotating ring rotatably arranged at the bottom end of the air blowing column through the air blowing column, enters the air blowing ring through the telescopic air blowing pipe movably arranged on the rotating ring, and finally enters a parison through the air blowing opening in the air blowing ring.

As shown in fig. 5 and 12, when the air is supplied into the air blowing column during operation, the air pressure in the air blowing column is increased to drive the switching block positioned in the through hole to move towards the outer side of the air blowing column, and at the moment, the switching block is switched to a1 state, the spiral grooves positioned on the peripheral wall of the air blowing column are communicated, and the linear grooves are closed. As shown in FIG. 4, the blow ring spirally rises along the spiral groove because a reaction force is generated to the blow ring when the gas enters the parison from the blow port provided on the blow ring. At this time, when the air entering from the air blowing column enters the parison, the air is blown along the axial rotation of the air blowing column, and the air is slowly moved along the axis of the air blowing column to change the air blowing position, so that the forming thickness of the plastic barrel is uniform. Because the air in the air blowing column is blown out through the air blowing opening on the air blowing ring, the position of the air blowing column cannot be changed when the air blowing ring slides on the air blowing column, and the sealing state of the air blowing column and the parison cannot be influenced. The invention utilizes the counterforce of the air blown from the air blowing opening to drive the air blowing ring to slide and rise along the spiral groove of the spiral air blowing column, thereby ensuring that the air is blown to the periphery without dead angles, changing the air blowing position and ensuring that the forming thickness of the plastic barrel is uniform. Meanwhile, the blowing ring is designed to slide on the blowing column, the position of the blowing column is not changed, and the sealing performance of the blowing column and the parison is guaranteed. The rotating ring is arranged to rotate synchronously with the air blowing ring when the air blowing ring rises spirally, so that the phenomenon that the extended air blowing pipe is wound due to the rotation of the air blowing ring to influence air blowing is avoided.

As shown in fig. 4 and 12, after air-blowing forming, cooling and demoulding, air is sucked into the air-blowing column to make the air-blowing column low-pressure, at this time, the air pressure in the air-blowing column is reduced to drive the switching block positioned in the through hole to move towards the inner side of the air-blowing column, at this time, the switching block is switched to a2 state, the linear groove positioned on the peripheral wall of the air-blowing column is opened, and the air-blowing ring is lowered along the linear groove under the action of gravity to return to the original position.

Furthermore, the air blowing openings are distributed at intervals along the circumferential direction of the air blowing ring. The arrangement is to make the blowing ring stressed evenly when receiving the reaction force of the gas, and the blowing ring can rotate smoothly.

Furthermore, a bulge is arranged at the top end of the air blowing ring, and a wedge surface a is formed on the bulge; the upper end of the air blowing column is provided with closed holes at intervals along the circumferential direction, a closed block is arranged in the closed holes in a sliding mode, the closed block is arranged in the closed holes in a sliding mode along the radial direction of the air blowing column in a sliding mode, one end of the closed block is fan-shaped, and the other end of the closed block is provided with a wedge surface b corresponding to the wedge surface a.

When the blowing ring rises to the top, the bulge positioned at the top of the blowing ring is contacted with the sealing block at the upper end of the blowing column, and the wedge surface a on the bulge extrudes the wedge surface b to drive the sealing block to move inwards along the radial direction of the blowing column. As shown in fig. 11, one end of the sector of the 4 sealing blocks is mutually folded to seal the air inlet channel of the air blowing column, and the air blowing ring stops supplying air.

Further, the bottom surface of the working plate is provided with a closed ring made of rubber.

Furthermore, the inner wall of the air blowing ring is provided with a convex ball, and the convex ball slides along the spiral groove and the vertical groove.

Furthermore, a sliding groove is vertically formed in the working plate, a sliding piece is installed in the sliding groove in a sliding mode, and the sliding piece is hinged to one end of the connecting rod; a compression spring is provided between the slider and the operating plate in the sliding direction of the slider.

Furthermore, the switching block is provided with a through groove.

Furthermore, the gas temperature that the gas blowing mechanism blew off was 20 ~ 50 ℃.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the blowing assembly provided with the parison is fixed on the working plate, and the working plate slides on the frame during working and moves downwards to drive the blowing assembly provided with the parison to move to the centers of the two plastic molds; and when the working plate moves downwards, the connecting rod drives the two plastic molds to move oppositely to carry out mold closing. When the working plate drives the parison to move to the working position, the two plastic molds are completely closed to form a seal. The movement of the working plate not only completes the feeding action of the blank, but also drives the plastic mould to carry out mould closing, and the feeding action and the mould closing are carried out simultaneously, thereby saving the production time, reducing a power source and improving the production efficiency. And the structure ensures that the plastic mould slides linearly on the frame, thereby ensuring the accuracy of folding. The feeding action of the working plate is utilized to drive the plastic mold to be closed, and when the parison enters the working position, the plastic mold is bound to be closed, so that the plastic mold and the parison are stably and reliably moved and matched with each other.

2. The invention utilizes the counterforce of the gas blown from the gas blowing port to drive the gas blowing ring to slide and rise along the spiral groove of the gas blowing column, thereby ensuring that the gas is blown to the periphery without dead angles, changing the gas blowing position and ensuring that the forming thickness of the plastic barrel is uniform. Meanwhile, the blowing ring is designed to slide on the blowing column, the position of the blowing column is not changed, and the sealing performance of the blowing column and the parison is guaranteed. The rotating ring is arranged to rotate synchronously with the air blowing ring when the air blowing ring rises spirally, so that the phenomenon that the extended air blowing pipe is wound due to the rotation of the air blowing ring to influence air blowing is avoided.

3. In the present invention, the position of the blow ring cannot be observed in the closed plastic mold, and therefore, it is impossible to determine whether the blow molding process is completed. The invention utilizes the spiral rising and spiral rising of the blowing ring to trigger the sealing block to seal the air inlet channel of the blowing column so as to judge the position of the blowing ring and further judge whether the blowing forming process is finished, thereby avoiding time waste and improving the production efficiency under the condition of ensuring the blowing effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a process flow diagram of a large barreled plastic part production process of the present invention;

FIG. 2 is a schematic view of the blow molding apparatus of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 2 according to the present invention;

FIG. 4 is a schematic view of the construction of the air-blowing assembly of the present invention;

FIG. 5 is an enlarged view of a portion B of FIG. 4 in accordance with the present invention;

FIG. 6 is a schematic view of the structure of the rotating ring and the blowing ring of the present invention;

FIG. 7 is a schematic view of the rotating ring and the blowing ring of the present invention from another perspective;

FIG. 8 is a schematic view of the blow molding apparatus of the present invention with the plastic mold removed;

FIG. 9 is a schematic structural view of the plastic mold of the present invention;

FIG. 10 is a schematic view of another aspect of the blowing assembly of the present invention;

FIG. 11 is a schematic view of the structure of a sealing block on the blow pin of the present invention;

FIG. 12 is a schematic view of the structure of a switch block on the blow pin of the present invention;

FIG. 13 is a schematic view of another perspective of the blow molding apparatus of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1-frame, 2-working plate, 3-blowing component, 4-plastic mould, 5-connecting rod, 6-blowing column, 7-blowing ring, 8-blowing port, 9-spiral groove, 10-vertical groove, 11-through hole, 12-switching block, 13-rotating ring, 14-blowing pipe, 15-bulge, 16-wedge surface a, 17-closed hole, 18-closed block, 19-wedge surface b, 20-closed ring, 21-convex ball, 22-sliding groove, 23-sliding piece, 24-compression spring and 25-through groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-13, the present invention provides a technical solution: a production process of large barreled plastic parts mainly comprises the following steps:

s1: the parison is fitted on a blow pin 6 in a blow molding apparatus;

s2: starting a power supply to drive the working plate 2 to move downwards, moving the parison to a working position and simultaneously closing the molds;

s3: supplying air to the blowing assembly 3 to blow mold the parison;

s4: and opening the mold, cooling and demolding.

The blow molding device comprises a blow mold opening and closing mechanism which is horizontally and slidably arranged on the rack 1 and a blowing mechanism which is vertically and slidably arranged on the rack 1; the blowing mechanism comprises a working plate 2 which is slidably arranged on the rack 1 and a blowing assembly 3 which is fixedly arranged in the center of the working plate 2; the blow mold opening and closing mechanism comprises a plastic mold 4 which is slidably arranged on the rack 1; a connecting rod 5 is arranged between the plastic mould 4 and the working plate 2, and two ends of the connecting rod 5 are respectively hinged with the plastic mould 4 and the working plate 2.

When the blow molding equipment is used for manufacturing the plastic barrel, quantitative softened plastic is extruded by an extruder to form a parison, the parison is placed in a cavity formed by a mold, compressed air is injected into the cavity to ensure that the plastic parison is blown to cling to the inner wall of the mold, and the plastic barrel is obtained after cooling and demolding. In the prior art, when a parison is placed in a mold, a blowing mechanism provided with the parison is placed between two plastic molds 4, then a blow mold opening and closing mechanism closes the two plastic molds 4 to be closed, and then blowing molding is performed. Not only does this approach consume a significant amount of time and reduce production efficiency, but the blowing mechanism and the blow mold opening and closing mechanism require different drive sources to drive, which increases production costs. As shown in fig. 2, the blowing assembly 3 with the parison is fixed on the working plate 2, and the working plate 2 slides in the vertical direction on the frame 1 during working, and moves downwards to drive the blowing assembly 3 with the parison to move to the center of the two plastic molds 4; while the working plate 2 moves downward, the connecting rod 5 drives the two plastic molds 4 to move towards each other for mold closing. When the working plate 2 drives the parison to move to the working position, the two plastic molds 4 are completely closed to form a seal. The movement of the working plate 2 not only completes the feeding action of the blank, but also drives the plastic mould 4 to close the mould, and the two actions are carried out simultaneously, thereby saving the production time, reducing a power source and improving the production efficiency. And the structure ensures that the plastic mould 4 slides linearly on the frame 1, thereby ensuring the accuracy of folding. The feeding action of the working plate 2 is utilized to drive the plastic mould 4 to be matched, when the parison enters the working position, the plastic mould 4 is bound to be closed, so that the plastic mould 4 and the parison are stably and reliably matched with each other in a moving way.

Further, the blowing assembly 3 comprises a hollow blowing column 6 and a blowing ring 7 provided with a blowing opening 8, and a spiral groove 9 and a vertical groove 10 are formed in the outer peripheral wall of the blowing column 6; the air blowing ring 7 slides in the spiral groove 9 and the vertical groove 10; a through hole 11 is formed at the intersection of the spiral groove 9 and the vertical groove 10 of the air blowing column 6, a switching block 12 is arranged in the through hole 11 in a sliding manner, and the switching block 12 slides along the air blowing column 6 in the radial direction; the switch block 12 has two states of a1 and a 2;

a 1: the switching block 12 seals the linear groove, and the air blowing ring 7 slides in the spiral groove 9; a 2: the switching block 12 opens the linear groove, and the air blowing ring 7 slides in the linear groove; the bottom end of the air blowing column 6 is rotatably provided with a rotating ring 13, a telescopic air blowing pipe 14 is movably arranged on the rotating ring 13, and the air blowing pipe 14 is communicated with the air blowing column 6 and the air blowing ring 7.

In the actual production process, because the fixed singleness in position of blowing for the product appears like the inhomogeneous inflation that the balloon is the same, and the position thickness far away that often appears apart from the position of blowing is high, and the position thickness near apart from the position of blowing is low, and plastic drum shaping thickness is inhomogeneous, has reduced the production quality of plastic drum, leads to production facility's practicality to reduce. The existing solution is that the blowing column 6 is rotated and the blowing column 6 is slowly moved along the axis when blowing air, and the blowing position is changed to make the forming thickness of the plastic barrel uniform. However, this method may cause the air-blowing column 6 to move and generate a gap between the parison and the air-blowing column, which is not sealed, and thus the plastic barrel molding is affected. As shown in figure 4, when the invention is in operation, air is supplied into the air blowing column 6, enters the rotating ring 13 rotatably arranged at the bottom end of the air blowing column 6 through the air blowing column 6, then enters the air blowing ring 7 through the telescopic air blowing pipe 14 movably arranged on the rotating ring 13, and finally enters a parison through the air blowing opening 8 on the air blowing ring 7.

As shown in fig. 5 and 12, when air is supplied into the puffer cylinder 6 during operation, the air pressure in the puffer cylinder 6 increases to drive the switching block 12 positioned in the through hole 11 to move to the outside of the puffer cylinder 6, and at this time, the switching block 12 is switched to a1 state, the spiral grooves 9 positioned on the peripheral wall of the puffer cylinder 6 are communicated, and the linear grooves are closed. As shown in FIG. 4, the blow ring 7 is spirally raised along the spiral groove 9 because a reaction force is generated to the blow ring 7 when the gas enters the parison from the blow port 8 provided on the blow ring 7. At this time, when the air entering from the air blowing column 6 enters the parison, the air is blown along the axial rotation of the air blowing column 6, and the air is slowly moved along the axis of the air blowing column 6 to change the air blowing position, so that the forming thickness of the plastic barrel is uniform. In the scheme, the air in the air blowing column 6 is blown out through the air blowing opening 8 on the air blowing ring 7, and the position of the air blowing column 6 cannot be changed by sliding the air blowing ring 7 on the air blowing column 6, so that the sealing state of the air blowing column 6 and the parison cannot be influenced. The invention utilizes the counterforce of the air blown from the air blowing opening 8 to drive the air blowing ring 7 to slide and rise along the spiral groove 9 of the spiral air blowing column 6, thereby ensuring that the air is blown to the periphery without dead angles, changing the air blowing position and ensuring that the forming thickness of the plastic barrel is uniform. Meanwhile, the blowing ring 7 is designed to slide on the blowing column 6, the position of the blowing column 6 is not changed, and the sealing performance between the blowing column 6 and the parison is guaranteed. The rotating ring 13 is arranged to enable the rotating ring 13 to rotate synchronously with the blowing ring 7 when the blowing ring 7 spirally rises, so that the phenomenon that the extended blowing pipe 14 is wound due to the rotation of the blowing ring 7 to influence blowing is avoided.

As shown in fig. 4 and 12, after air-blowing molding, cooling and demolding, air is sucked into the air blowing column 6 to make the air blowing column 6 low-pressure, at this time, the air pressure in the air blowing column 6 is reduced to drive the switching block 12 positioned in the through hole 11 to move towards the inner side of the air blowing column 6, at this time, the switching block 12 is switched to a state of a2, the linear groove positioned on the peripheral wall of the air blowing column 6 is opened, and the air blowing ring 7 descends along the linear groove under the action of gravity to return to the original position.

Further, the blowing openings 8 are distributed at intervals along the circumferential direction of the blowing ring 7. The arrangement is to make the blowing ring 7 evenly stressed when receiving the reaction force of the gas, so that the blowing ring 7 can smoothly rotate.

Furthermore, the top end of the blowing ring 7 is provided with a bulge part 15, and a wedge surface a16 is arranged on the bulge part 15; the upper end of the air blowing column 6 is provided with closed holes 17 at intervals along the circumferential direction, a closed block 18 is arranged in the closed holes 17 in a sliding mode, the closed block 18 is arranged in the air blowing column 6 in a sliding mode along the radial direction, one end of the closed block 18 is fan-shaped, and the other end of the closed block 18 is provided with a wedge surface b19 corresponding to the wedge surface a 16.

As a further scheme of the invention, when the blowing ring 7 is spirally lifted during operation, when the blowing ring 7 is lifted to the top, the lug boss 15 positioned at the top of the blowing ring 7 is contacted with the sealing block 18 at the upper end of the blowing column 6, the wedge surface a16 on the lug boss 15 presses the wedge surface b19, and the sealing block 18 is driven to move inwards along the radial direction of the blowing column 6. As shown in fig. 11, one ends of the sectors of the 4 closing blocks 18 are mutually closed to close the air inlet channel of the air blowing column 6, and the air blowing ring 7 stops supplying air. In the present invention, the position of the blow ring 7 cannot be observed in the plastic mold 4, and therefore, it is impossible to determine whether or not the blow molding process is completed. The invention utilizes the spiral rising of the blowing ring 7 to spirally rise and trigger the sealing block 18 to seal the air inlet channel of the blowing column 6, thereby judging the position of the blowing ring 7 and further judging whether the blowing forming process is finished or not, avoiding time waste and reducing the production efficiency under the condition of ensuring the blowing effect.

Further, the bottom surface of the work plate 2 is provided with a closing ring 20 made of rubber. The sealing ring 20 is provided to increase the sealing of the blow pin 6 with the parison.

Further, the inner wall of the blowing ring 7 is provided with a convex ball 21, and the convex ball 21 slides along the spiral groove 9 and the vertical groove 10. The provision of the convex balls 21 makes it easier to slide the blow ring 7 along the spiral grooves 9 and the vertical grooves 10.

Furthermore, the working plate 2 is vertically provided with a sliding groove 22, a sliding part 23 is arranged in the sliding groove 22 in a sliding manner, and the sliding part 23 is hinged with one end of the connecting rod 5; a compression spring 24 is provided between the slider 23 and the operating plate 2 in the sliding direction of the slider 23. According to the invention, feeding of the blowing mechanism and die assembly of the blow mold opening and closing mechanism are carried out simultaneously, the movement of the working plate 2 not only completes feeding of a parison, but also drives the plastic mold 4 to carry out die assembly, but errors can be generated when the plastic mold 4 is moved and matched, and the condition that the blowing assembly 3 does not reach the working position when the plastic mold 4 is closed and closed can occur, so that blowing is influenced. In addition, as shown in fig. 13, since the closing ring 20 needs to be clamped outside the upper end edge of the plastic mold 4, the closing ring 20 needs to move downward a distance after the plastic mold 4 is closed to clamp the seal. As shown in fig. 3, the present invention has a slide groove 22 provided in the vertical direction of the work plate 2, and a slider 23 is slidably mounted in the slide groove 22. When in work, the working plate 2 moves downwards to drive the plastic mould 4 to be closed through the connecting rod 5. When the plastic mold 4 is closed and closed but the blowing assembly 3 does not reach the working position, the working plate 2 continues to move downwards, at the moment, the plastic mold 4 is closed and cannot move, so that the working plate 2 continues to move downwards, the closing ring 20 is clamped on the outer side of the upper end edge of the plastic mold 4 to form a seal, the sliding piece 23 extrudes the compression spring 24, and the compression spring 24 contracts.

Furthermore, the switch block 12 is provided with a through slot 25. The arrangement of the through groove 25 can enable the convex ball 21 of the blowing ring 7 to smoothly pass through the spiral groove 9 when passing through the intersection of the spiral groove 9 and the straight groove when the switching block 12 is in the a1 state, so as to avoid entering the straight groove, thereby ensuring that the blowing ring 7 can smoothly rise to the top end of the blowing column 6, blowing the whole parison, and enabling the plastic barrel to be molded uniformly.

The gas temperature that blows off of gas blowing mechanism is 20 ~ 50 ℃. Therefore, the parison can be rapidly cooled and formed, and insufficient cooling is avoided.

The working principle is as follows: as shown in fig. 2, the blowing assembly 3 with the parison is fixed on the working plate 2, and the working plate 2 slides on the frame 1 during working, and moves downwards to drive the blowing assembly 3 with the parison to move to the center of the two plastic molds 4; while the working plate 2 moves downward, the connecting rod 5 drives the two plastic molds 4 to move towards each other for mold closing. As shown in fig. 3, when the plastic mold 4 is closed and the blowing assembly 3 has not yet reached the working position, the work plate 2 continues to move downward, and at this time, because the plastic mold 4 is closed and cannot move, the work plate 2 continues to move downward, the closing ring 20 is clamped outside the upper end edge of the plastic mold 4 to form a seal, the sliding member 23 presses the compression spring 24, and the compression spring 24 contracts. As shown in figure 4, after the feeding and die assembly are completed, air is supplied to the air blowing column 6, the air enters the rotating ring 13 rotatably installed at the bottom end of the air blowing column 6 through the air blowing column 6, then enters the air blowing ring 7 through the telescopic air blowing pipe 14 movably installed on the rotating ring 13, and finally enters the parison through the air blowing opening 8 in the air blowing ring 7. As shown in fig. 5 and 12, when air is supplied into the puffer cylinder 6 during operation, the air pressure in the puffer cylinder 6 increases to drive the switching block 12 positioned in the through hole 11 to move to the outside of the puffer cylinder 6, and at this time, the switching block 12 is switched to a1 state, the spiral grooves 9 positioned on the peripheral wall of the puffer cylinder 6 are communicated, and the linear grooves are closed. As shown in FIG. 4, the blow ring 7 is spirally raised along the spiral groove 9 because a reaction force is generated to the blow ring 7 when the gas enters the parison from the blow port 8 provided on the blow ring 7. At this time, when the air entering from the air blowing column 6 enters the parison, the air is blown along the axial rotation of the air blowing column 6, and the air is slowly moved along the axis of the air blowing column 6 to change the air blowing position, so that the forming thickness of the plastic barrel is uniform. In the scheme, the air in the air blowing column 6 is blown out through the air blowing opening 8 on the air blowing ring 7, and the position of the air blowing column 6 cannot be changed by sliding the air blowing ring 7 on the air blowing column 6, so that the sealing state of the air blowing column 6 and the parison cannot be influenced. When the blowing ring 7 rises to the top, the bulge part 15 positioned at the top of the blowing ring 7 contacts with the sealing block 18 at the upper end of the blowing column 6, and the wedge surface a16 on the bulge part 15 presses the wedge surface b19 to drive the sealing block 18 to move inwards along the radial direction of the blowing column 6. As shown in fig. 11, one ends of the sectors of the 4 closing blocks 18 are closed to each other to close the air inlet passage of the blowing pin 6, the air supply of the blowing ring 7 is stopped, and at this time, the air blow molding is completed. And cooling and demolding after the blow molding is finished. After the completion, the blow molding device is reset, the working plate 2 moves upwards, and the plastic molds 4 are separated from each other through the connecting rod 5. At the moment, air is sucked into the air blowing column 6 to enable the air blowing column 6 to be low in pressure, the air pressure in the air blowing column 6 is reduced to drive the switching block 12 positioned in the through hole 11 to move towards the inner side of the air blowing column 6, the switching block 12 is switched to be in a2 state at the moment, the linear groove positioned on the peripheral wall of the air blowing column 6 is opened, and the air blowing ring 7 descends along the linear groove to return to the original position under the action of gravity.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A production process of large barreled plastic parts is characterized in that: the method mainly comprises the following steps:

s1: assembling the parison on a blow pin (6) in a blow molding apparatus;

s2: starting a power supply to drive the working plate (2) to move downwards, moving the parison to a working position and closing the molds at the same time;

s3: supplying air to the blowing assembly (3) to blow mold the parison;

s4: opening the mold, cooling and demolding;

the blow molding device comprises a blow mold opening and closing mechanism which is horizontally and slidably arranged on the rack (1) and a blowing mechanism which is vertically and slidably arranged on the rack (1); the blowing mechanism comprises a working plate (2) which is slidably arranged on the rack (1) and a blowing assembly (3) which is fixedly arranged in the center of the working plate (2); the blow mold opening and closing mechanism comprises a plastic mold (4) which is slidably arranged on the rack (1); a connecting rod (5) is arranged between the plastic mould (4) and the working plate (2), and two ends of the connecting rod (5) are respectively hinged with the plastic mould (4) and the working plate (2).

2. A process for producing a large barrel-shaped plastic part according to claim 1, wherein: the blowing assembly (3) comprises a hollow blowing column (6) and a blowing ring (7) provided with a blowing opening (8), and the outer peripheral wall of the blowing column (6) is provided with a spiral groove (9) and a vertical groove (10); the air blowing ring (7) slides in the spiral groove (9) and the vertical groove (10); a through hole (11) is formed at the intersection of the spiral groove (9) and the vertical groove (10) on the air blowing column (6), a switching block (12) is arranged in the through hole (11) in a sliding manner, and the switching block (12) slides along the air blowing column (6) in the radial direction; the switching block (12) has two states of a1 and a 2; a 1: the switching block (12) seals the linear groove, and the air blowing ring (7) slides in the spiral groove (9); a 2: the switching block (12) opens the linear groove, and the air blowing ring (7) slides in the linear groove; the bottom end of the air blowing column (6) is rotatably provided with a rotating ring (13), the rotating ring (13) is movably provided with a telescopic air blowing pipe (14), and the air blowing pipe (14) is communicated with the air blowing column (6) and the air blowing ring (7).

3. A process for producing a large barrel-shaped plastic part according to claim 2, wherein: the air blowing openings (8) are distributed at intervals along the circumferential direction of the air blowing ring (7).

4. A process for producing a large barrel-shaped plastic part according to claim 3, wherein: a bulge (15) is arranged at the top end of the air blowing ring (7), and a wedge surface a (16) is arranged on the bulge (15); the upper end of the air blowing column (6) is provided with closed holes (17) at intervals along the circumferential direction, a closed block (18) is arranged in the closed holes (17) in a sliding mode, the closed block (18) is arranged in the air blowing column (6) in a sliding mode along the radial direction, one end of the closed block (18) is fan-shaped, and the other end of the closed block is provided with a wedge surface b (19) corresponding to the wedge surface a (16).

5. A process for producing a large barrel-shaped plastic part according to claim 4, wherein: the bottom surface of the working plate (2) is provided with a closed ring (20) made of rubber.

6. A process for producing a large barrel-shaped plastic part according to claim 5, wherein: the inner wall of the air blowing ring (7) is provided with a convex ball (21), and the convex ball (21) slides along the spiral groove (9) and the vertical groove (10).

7. A process for producing a large barrel-shaped plastic part according to claim 6, wherein: the working plate (2) is vertically provided with a sliding groove (22), a sliding part (23) is arranged in the sliding groove (22) in a sliding manner, and the sliding part (23) is hinged with one end of the connecting rod (5); a compression spring (24) is provided between the slider (23) and the work plate (2) in the sliding direction of the slider (23).

8. A process for producing a large barrel-shaped plastic part according to claim 7, wherein: the switching block (12) is provided with a through groove (25).

9. A process for producing a large barrel-shaped plastic part according to claim 8, wherein: the gas temperature that blows off of gas blowing mechanism is 20 ~ 50 ℃.