CN112172104A

CN112172104A - PVC-O tubular product bellmouth inflation shaping die cavity

Info

Publication number: CN112172104A
Application number: CN202010993536.3A
Authority: CN
Inventors: 孙建凯; 顾建国; 侯培培; 赵朋飞; 郑书华; 霍志晴
Original assignee: Hebei Wanlitai Olive Pipe Industry Co ltd
Current assignee: Hebei Wanlitai Olive Pipe Industry Co ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-01-05

Abstract

The invention discloses a PVC-O pipe bellmouth blow molding cavity which comprises a shaped block assembly, wherein the shaped block assembly comprises a first shaped block and a second shaped block which are oppositely arranged, and the opposite surfaces of the first shaped block and the second shaped block are respectively provided with a cavity matched with the appearance of the PVC-O pipe bellmouth and a water through groove for cooling and shaping the bellmouth; and the first molding block and the second molding block are both provided with a water inlet hole and a first drainage hole which are communicated with the water through groove. The invention can complete the inflation molding of the PVC-O pipe bell mouth and the cooling shaping after molding, and effectively improves the strength, toughness and shock resistance of the bell mouth part.

Description

PVC-O tubular product bellmouth inflation shaping die cavity

Technical Field

The invention relates to the field of PVC-O pipe production equipment, in particular to a PVC-O pipe bellmouth blow molding cavity.

Background

The PVC-O pipe is an oriented pipe obtained by heating a PVC-U pipe to a high elastic state and performing biaxial tension, and has the characteristics of high strength, high toughness, impact resistance and the like. The forming process of the socket of the traditional PVC-O pipe which is widely used at present comprises the following steps: one end of the pipe is heated and then inserted into a flaring die, a built-in forming slide block is opened under the action of force, the softened pipe wall is supported by mechanical force, and then the pipe is cooled and shaped. The process has the following disadvantages: in the forming process of the socket of the PVC-O pipe, high-temperature heating is needed, the original shaped molecular biaxial orientation structure retracts under the heating state, the orientation characteristic is lost, the strength, the toughness and the impact resistance of the socket part of the PVC-O pipe are greatly reduced, the standard technical requirements of the PVC-O pipe cannot be met, and the potential safety hazard of water delivery exists. Based on this, a PVC-O pipe bellmouth blow molding cavity is designed.

Disclosure of Invention

The invention aims to provide a PVC-O pipe bellmouth blow molding cavity, which solves the problem that the strength, toughness and impact resistance of a PVC-O pipe bellmouth in the background technology are greatly reduced after the PVC-O pipe bellmouth is processed and molded.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention relates to a PVC-O pipe bellmouth inflation molding cavity which comprises a shaped block assembly, wherein the shaped block assembly comprises a first shaped block and a second shaped block which are oppositely arranged, and the opposite surfaces of the first shaped block and the second shaped block are respectively provided with a cavity matched with the appearance of the PVC-O pipe bellmouth and a water through groove for cooling and shaping the bellmouth;

and the first molding block and the second molding block are both provided with a water inlet hole and a first drainage hole which are communicated with the water through groove.

Furthermore, the water inlet hole and the first water drainage hole are respectively located on two sides of the cavity.

Furthermore, the first molding block and the second molding block are both provided with second drain holes communicated with the water through grooves, and the second drain holes are located below the cavity.

Furthermore, the first drain hole and the second drain hole are communicated with a negative pressure water absorption device through pipelines, and the water inlet hole is communicated with a water supply device through a pipeline.

Further, the water through groove is perpendicular to the cavity.

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

the invention is matched with a core mould for use, the preformed end part of the PVC-O pipe is deformed and expanded under the action of fluid pressure through the pore on the core mould, and the expanded end part is tightly attached to the cavity wall of a cavity; after the bell mouth is formed, water is supplied into the water inlet hole, the water passing groove on the cavity is annularly wrapped on the PVC-O pipe, and cooling water in the water passing groove cools and shapes the expanded end part of the PVC-O pipe; the invention can complete the inflation molding of the PVC-O pipe bell mouth and the cooling shaping after molding, and effectively improves the strength, toughness and shock resistance of the bell mouth part.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 is a schematic structural view of a module assembly of the present embodiment;

FIG. 2 is a schematic diagram of a second type block in this embodiment

FIG. 3 is a sectional view of the second mold block in the axial direction in the present embodiment;

FIG. 4 is a schematic top view of the second mold block of the present embodiment;

FIG. 5 is a schematic view of the installation and use of the block assembly of this embodiment;

fig. 6 is a schematic view of the structure of the mouthpiece formed by inflation in this embodiment.

Description of reference numerals: 1. a block assembly; 101. a first type block; 102. a second type block; 103. a cavity; 104. a water inlet hole; 105. a first drain hole; 106. a water trough; 107. a second drain hole; 2. a cavity frame; 3. heating furnace; 4. a core mold; 5. a hollow shaft; 6. PVC-O pipe material; 601. a socket; 7. a hydraulic cylinder; 8. an equipment rack body; 9. a power transmission shaft; 901. a shaft sleeve; 10. a rotary joint; 11. a pressure main pipeline; 12. a first branch pipe; 1201. a negative pressure device; 1202. a first valve; 13. a second branch pipe; 1301. a high pressure device; 1302. a second valve; 14. a box body; 15. a drive motor; 16. a slide rail assembly.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.

As shown in fig. 1 to 4, the present embodiment discloses a PVC-O pipe bell mouth blow molding cavity, which includes a block assembly 1, the block assembly 1 includes a first block 101 and a second block 102 arranged oppositely, a cavity 103 adapted to the shape of the PVC-O pipe bell mouth is arranged on each of the opposite surfaces of the first block 101 and the second block 102, and a water trough 106 for cooling and shaping the bell mouth, in the present embodiment, the water trough 106 is arranged perpendicular to the cavity 103.

Both the first block 101 and the second block 102 are provided with a water inlet 104 and a first drain hole 105 communicating with a water passage tank 106. The water inlet hole 104 and the first drain hole 105 are respectively positioned on two sides of the cavity 103.

In order to discharge the residual water at the bottom of the water passage groove 106 and facilitate the next socket manufacture, a second water discharge hole 107 communicated with the water passage groove 106 is arranged on the first mold block 101 and the second mold block 102, and the second water discharge hole 107 is positioned below the cavity 103.

When the block assembly 1 is used, the first drain hole 105 and the second drain hole 107 are both communicated with a negative pressure water suction device through pipelines, and the water inlet hole 104 is communicated with a water supply device through a pipeline.

As shown in figure 5, the mould block assembly 1 is required to be arranged on PVC-O pipe socket blow molding equipment during use, and the equipment mainly comprises a cavity frame 2, a heating furnace 3 and a core mould 4. The mould block assembly 1, the heating furnace 3 and the core mould 4 are coaxially arranged in sequence.

The first molding block 101 and the second molding block 102 are connected with the driving ends of corresponding hydraulic cylinders 7 arranged on the cavity frame 2, and the first molding block 101 and the second molding block 102 are driven by the hydraulic cylinders 7 to move. The cavity frame 2 is square, and the cavity frame 2 is installed on the equipment support body 8 below through a bolt assembly.

The core mold 4 is of a hollow structure, a plurality of holes communicated with the inner cavity of the core mold 4 are formed in the circumferential wall of the core mold 4, an electric heating sleeve is further arranged in the inner cavity of the core mold 4, the core mold 4 is installed at the front end of the hollow shaft 5, a through hole communicated with the inner cavity of the core mold 4 is formed in the front end of the hollow shaft 5, the rear end of the hollow shaft 5 is connected to a hollow power transmission shaft 9 through a bolt, the rear end of the power transmission shaft 9 is communicated with a main pressure pipeline 11 through a rotary joint 10, and the main pressure pipeline 11 is respectively communicated with the negative pressure device 1201 and the high pressure device 1301 through a first. The first branch pipe 12 is provided with a first valve 1202 and the second branch pipe 13 is provided with a second valve 1302. In this embodiment, the negative pressure device 1201 is a vacuum pump, and the high pressure device 1301 is a high pressure air tank, which is supplied with high pressure air by an air compression pump.

The power transmission shaft 9 is rotatably connected with a shaft sleeve 901 on the outer side through a bearing, the shaft sleeve 901 is installed in the box body 14 through a bolt, a belt pulley is arranged at the rear part of the power transmission shaft 9 and is in power connection with a driving motor 15 through a belt, the driving motor 15 is installed at the bottom of the box body 14, the box body 14 is installed on a sliding block of a sliding rail assembly 16, and a sliding rail of the sliding rail assembly 16 is connected with an equipment frame body 8 in front. The box 14 can be driven by a hydraulic cylinder, the telescopic end of the hydraulic cylinder is hinged to the bottom of the box 14, and the body of the hydraulic cylinder is hinged to a fixed base.

In combination with the bell mouth forming equipment, the embodiment also discloses a PVC-O pipe fluid inflation type bell mouth forming process, which comprises five steps of inserting a core die and a pipe, heating the pipe and adsorbing the pipe under negative pressure, locking and closing a cavity, blowing and forming high-pressure fluid, and separating the core die from the pipe.

Step S1, inserting the core mold into the pipe, conveying the preheated PVC-O pipe 6 to a set position through a roller, clamping and fixing the PVC-O pipe 6 by a hydraulic clamping device, driving the box 14 to move forward through the sliding rail component 16 under the driving of a hydraulic cylinder, and driving the core mold 4 to be inserted into the preformed end part of the PVC-O pipe 6.

Step S2, heating the pipe and absorbing under negative pressure: the hydraulic clamping device for fixing the PVC-O pipe 6 is opened, the PVC-O pipe 6 is driven by the core mould 4 to retreat into the heating furnace 3, and the end part of the PVC-O pipe 6 is heated by the heating furnace 3 and the electric heating sleeve arranged in the core mould 4. In order to heat the preformed end part of the PVC-O pipe 6 uniformly, the driving motor 15 can drive the power transmission shaft 9 to rotate, and then the hollow shaft 5 and the core mold 4 drive the PVC-O pipe 6 to rotate and be heated uniformly.

When the PVC-O pipe 6 rotates to be uniformly heated, the negative pressure device 1201 is started, the first valve 1202 is opened, the negative pressure device 1201 sequentially passes through the first branch pipe 12, the pressure main pipe 11, the rotary joint 10, the hollow power transmission shaft 9 and the hollow shaft 5, so that the inner cavity of the core mold 4 is in a negative pressure state, the PVC-O pipe 6 is tightly attached to the outer wall of the core mold 4 through the hole in the core mold 4, and the PVC-O pipe 6 is prevented from axially retracting in the heating process.

Step S3, locking and closing the cavity: after the PVC-O pipe 6 is heated to a specific temperature, the PVC-O pipe 6 enters a molding cavity position under the pushing of the core mold 4, and the hydraulic cylinder 7 drives the first molding block 101 and the second molding block 102 to move oppositely to clamp the preformed end part of the PVC-O pipe 6.

Step S4, high-pressure fluid blowing molding: injecting high-pressure fluid into the inner cavity of the core mould 4, enabling the preformed end part of the PVC-O pipe 6 to deform and expand under the pressure action of the fluid flowing out from the pore on the core mould 4, enabling the expanded end part of the PVC-O pipe 6 to be tightly attached to the cavity bodies of the upper cavity 103 and the lower cavity 103 so as to complete preforming according to a mould formed by the upper cavity 103 and the lower cavity 103, maintaining the pressure of the core mould 4 for a certain time, and cooling and shaping the end part of the PVC-O pipe 6.

Specifically, the negative pressure device 1201 and the first valve 1202 are closed, the high pressure device 1301 and the second valve 1302 are opened, the high pressure device 1301 sequentially passes through the second valve 1302, the main pressure pipe 11, the rotary joint 10, the hollow power transmission shaft 9 and the hollow shaft 5, so that the inner cavity of the core mould 4 is in a high-pressure state, the preformed end of the PVC-O pipe 6 is deformed and expanded under the action of fluid pressure through the pores in the core mould 4, and the end of the PVC-O pipe 6 is tightly attached to the cavity walls of the upper cavity 103 and the lower cavity 103 after being expanded.

And (3) maintaining the pressure of the core mold 4 for a certain time, supplying water into the water inlet hole 104, allowing cooling water to enter the first drainage hole 105 and the second drainage hole 107 through the water through groove 106, and finally discharging the cooling water by a negative pressure water absorption device, wherein the water through grooves 106 on the cavities 103 of the upper and lower cavities 103 are annularly wrapped on the PVC-O pipe 6, and the cooling water in the water through grooves 106 cools and shapes the expanded end part of the PVC-O pipe 6.

Step S5, separating the core mold from the pipe: closing the high-pressure device 1301, simultaneously driving the first molding block 101 and the second molding block 102 to move in the opposite direction by the hydraulic cylinder 7, opening the upper and lower molding cavities 103, fastening and fixing the PVC-O pipe 6 by the hydraulic fastening device, withdrawing and separating the core mold 4 from the PVC-O pipe 6, loosening the hydraulic fastening device, and retreating the PVC-O pipe 6 to leave the molding cavities 103 under the driving of the rollers to complete the manufacture of the bell mouth 601 of a single pipe.

As shown in fig. 6, the manufactured socket 601 is further subjected to a trimming process on its front end.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims

1. A PVC-O tubular product bellmouth inflation shaping die cavity which characterized in that: the PVC-O pipe socket comprises a mould block assembly (1), wherein the mould block assembly (1) comprises a first mould block (101) and a second mould block (102) which are oppositely arranged, and opposite surfaces of the first mould block (101) and the second mould block (102) are respectively provided with a cavity (103) matched with the shape of a PVC-O pipe socket and a water through groove (106) for cooling and shaping the socket;

and the first model block (101) and the second model block (102) are both provided with a water inlet hole (104) and a first drainage hole (105) which are communicated with the water trough (106).

2. The PVC-O pipe bellmouth inflation molding cavity of claim 1, wherein: the water inlet hole (104) and the first water drainage hole (105) are respectively positioned on two sides of the cavity (103).

3. The PVC-O pipe bellmouth inflation molding cavity of claim 2, wherein: and the first mould block (101) and the second mould block (102) are respectively provided with a second drainage hole (107) communicated with the water passing groove (106), and the second drainage hole (107) is positioned below the cavity (103).

4. The PVC-O pipe bellmouth inflation molding cavity as claimed in claim 3, characterized in that: the first drain hole (105) and the second drain hole (107) are communicated with the negative pressure water absorption device through pipelines, and the water inlet hole (104) is communicated with the water supply device through a pipeline.

5. The PVC-O pipe bellmouth inflation molding cavity of claim 1, wherein: the water trough (106) is arranged perpendicular to the cavity (103).