CN219133197U

CN219133197U - Vacuum sizing device and pipe extrusion molding device

Info

Publication number: CN219133197U
Application number: CN202223446321.3U
Authority: CN
Inventors: 李松泽; 叶坤明; 尹科; 李方远; 黄志勇; 李龙娇
Original assignee: Sichuan Yada Plastic Products Co ltd
Current assignee: Sichuan Yada Plastic Products Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-06-06
Anticipated expiration: 2032-12-22

Abstract

The utility model discloses a vacuum sizing device and a pipe extrusion molding device, wherein the vacuum sizing device comprises: sizing section, cooling section and vacuum section; the sizing section is used for sizing the extruded pipe, and the outlet end body of the sizing section is connected with one end body of the cooling section; the vacuum section inlet end body is connected with the cooling section other end body; the cooling section is communicated with the corresponding hollow part of the vacuum section, the vacuum section is connected with a vacuum pump, and the vacuum pump maintains the vacuumizing state of the cooling section and the vacuum section in the working state; a plurality of first nozzles are arranged in the cooling section, and cooling water sprayed out of the first nozzles cools the surface of the pipe; the vacuum section is provided with a plurality of second nozzles, and cooling water sprayed out of the second nozzles cools the surface of the pipe again. The device is beneficial to uniform wall thickness and size of the whole product and improves the stability.

Description

Vacuum sizing device and pipe extrusion molding device

Technical Field

The utility model relates to the technical field of pipe production, in particular to a vacuum sizing device and a pipe extrusion molding device.

Background

The production (such as PE pipe) and processing of the pipe is a technology with strong comprehensiveness, and relates to the aspects of polymer chemistry, polymer physics, interface theory, plastic machinery, plastic processing mould, formula design principle, process control and the like. The extrusion process and the vacuum sizing process are two critical processes in pipe production, wherein an extruder is mainly used in the extrusion process, and a sizing sleeve or a vacuum sizing box is used in the sizing process.

Vacuum sizing is one of the main methods for shaping plastic pipes, and its purpose is two: firstly, in order to obtain accurate geometric dimension, the other is to make plastics pressed tightly along the pipe wall, the principle is that the outer surface of the pipe is adsorbed on the inner wall of the sizing sleeve by establishing pressure difference between the inner cavity and the wall surface of the pipe, so as to obtain the pipe with the outer diameter and the wall thickness meeting the requirements of various specifications, and the vacuum sizing box is important in the forming of the pipe, and directly influences the internal quality and the appearance quality of the pipe.

How to realize the cooling of the extruded pipe is a technical problem of the vacuum sizing box, and particularly the requirement of good cooling molding needs to be met.

Disclosure of Invention

The utility model mainly aims to provide a vacuum sizing device and a pipe extrusion molding device, which have the characteristic of good cooling molding.

To achieve the above object, the present utility model proposes:

a vacuum sizing device, comprising: sizing section, cooling section and vacuum section;

the sizing section is used for sizing the extruded pipe, and the outlet end body of the sizing section is connected with one end body of the cooling section;

the vacuum section inlet end body is connected with the cooling section other end body; the cooling section is communicated with the corresponding hollow part of the vacuum section, the vacuum section is connected with a vacuum pump, and the vacuum pump maintains the vacuumizing state of the cooling section and the vacuum section in the working state; a plurality of first nozzles are arranged in the cooling section, and cooling water sprayed out of the first nozzles cools the surface of the pipe; the vacuum section is provided with a plurality of second nozzles, and cooling water sprayed out of the second nozzles cools the surface of the pipe again; the vacuum section body is provided with a water inlet which is respectively communicated with the first nozzle and the second nozzle, and the bottom of the vacuum section body is provided with a water outlet; the water inlet and the water outlet are communicated through a circulating water pump.

In some embodiments of the present utility model, the outlet end of the sizing section is detachably connected to one end of the cooling section, and a sealing layer is disposed between the outlet end of the sizing section and one end of the cooling section.

In some embodiments of the present utility model, the sizing section includes a through housing, a sizing sleeve; the sizing sleeve is sleeved along the axial direction of the shell; the outer wall of the sizing sleeve is matched with the inner wall of the shell to form a circulating water shell; or the shell is provided with a circulating water shell structure, and the outer wall of the sizing sleeve is matched with the inner wall of the shell; the circulating water shell is provided with two connectors, one connector is communicated with the water inlet, the other connector is communicated with the water outlet, and cooling water is circulated through the circulating water pump.

In some embodiments of the present utility model, the sizing sleeve is provided with a small hole penetrating the inner wall and the outer wall; or through small holes are formed in the corresponding positions of the sizing sleeve and the shell with the circulating water shell structure; so that the circulating water shell layer is communicated with the inner cavity of the sizing sleeve.

In some embodiments of the utility model, the cooling water unit cooling capacity of the cooling section is greater than the cooling water unit cooling capacity of the vacuum section.

In some embodiments of the utility model, a filter screen and a valve are arranged at the water inlet.

In some embodiments of the present utility model, a plurality of cooling rings that are independent of each other are disposed in the cooling section, and the cooling rings are disposed with the first nozzles; the cooling rings are respectively communicated with the water inlets; in the working state, the pipe penetrates through the axis of the cooling ring.

In some embodiments of the present utility model, the inlet of each cooling ring provided in the cooling section is similar or identical to the length of the water inlet.

In some embodiments of the utility model, the sizing section, the cooling section, and the vacuum section are coaxially disposed.

The utility model also provides a pipe extrusion molding device, which comprises a vacuum sizing device and a pipe extruder, wherein the pipe extruder is used for extruding pipes, and the pipes enter the vacuum sizing device for cooling and shaping.

According to the utility model, the rapid forced cooling section is arranged between the sizing section and the vacuum section, the cooling water quantity is large, the pipe is cooled by circulating cooling water and then subjected to secondary cooling, so that the cooling and shaping speed of the pipe can be increased, the pipe is rapidly solidified before being cooled again, the uniform wall thickness and the uniform size of the whole product are facilitated, and the stability is improved; and (3) performing secondary cooling on the vacuum section, further maintaining vacuum correspondingly to maintain the shape of the pipe, and further performing cooling and shaping.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a pipe extrusion molding device according to the present utility model;

FIG. 2 is a schematic diagram of the structure of the sizing section of the vacuum sizing device with small holes;

FIG. 3 is a schematic view of the structure of the sizing section of the vacuum sizing device without small holes;

FIG. 4 is a schematic cross-sectional view of a cooling ring of the pipe cooling section of the present utility model;

FIG. 5 is a schematic view of the longitudinal section of the vacuum section of the pipe according to the present utility model.

Reference numerals:

the pipe extruder 1, the vacuum sizing device 2, the sizing section 3, the shell 31, the circulating water shell 32, the connecting port 33, the sizing sleeve 34, the small hole 35, the cooling section 4, the cooling ring 41, the first nozzle 42, the vacuum section 5, the second nozzle 51, the water inlet 52, the water outlet 53, the filter screen 54, the valve 55, the sealing layer 6, the circulating water pump 7, the vacuum pump 8, the vacuumizing port 81 and the pipe 9.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Principle of: in the plastic pipe production process, the plastic in a molten state flows out from a gap of a plastic extruder die and is processed by a cooling shaping device to form the plastic pipe. The pipe is extruded by the extruder and enters the sizing sleeve of the sizing section of the vacuum sizing device, and the diameter of the extruded pipe is slightly larger than the inner diameter of the sizing sleeve, so that interference fit can be formed, and meanwhile, the pipe can be conveyed along the axial direction, so that the outer wall of the pipe is tightly attached to the inner wall of the sizing sleeve, and the sizing effect is achieved. After preliminary sizing, the pipe enters a cooling section, the refrigerant cools the outer wall of the pipe, the solidification and sizing function is achieved at the stage, the pipe enters a vacuum section after sizing at the stage, and the surface of the pipe can be smooth and has good consistency; if the pipe is directly subjected to the sizing sleeve without a rapid and strong cooling stage, the surface of the pipe is formed poorly, pits are easy to form, and the longitudinal section is deformed to a certain extent.

1-5, the present utility model discloses a vacuum sizing device 2, comprising: sizing section 3, cooling section 4 and vacuum section 5; the sizing section 3 is used for sizing the extruded pipe 9, and an outlet end body of the sizing section is connected with one end body of the cooling section 4; the inlet end body of the vacuum section 5 is connected with the body at the other end of the cooling section 4; the cooling section 4 is communicated with the corresponding hollow part of the vacuum section 5, the vacuum section 5 is connected with a vacuum pump 8, and the vacuum pump 8 maintains the vacuumizing state of the cooling section 4 and the vacuum section 5 in the working state; a plurality of first nozzles 42 are arranged in the cooling section 4, and cooling water sprayed out of the first nozzles 42 cools the surface of the pipe 9; the vacuum section 5 is provided with a plurality of second nozzles 51, and cooling water sprayed by the second nozzles 51 cools the surface of the pipe 9 again; the vacuum section 5 body is provided with a water inlet 52, the water inlet 52 is respectively communicated with the first nozzle 42 and the second nozzle 51, and the bottom of the vacuum section 5 body is provided with a water outlet 53; the water inlet 52 and the water outlet 53 are communicated through the circulating water pump 7.

Cooling water sprayed from the first nozzle 42 cools the surface of the pipe 9; the first nozzles 42 may be uniformly distributed or non-uniformly distributed, but the sprayed fluid needs to uniformly act on the surface of the pipe 9 to cool. As a preferable mode, the first nozzles 42 with the same specification are selected, so that the cost can be reduced, and the uniformly distributed arrangement mode is simpler. The same second nozzle 51 is provided with reference to the first nozzle 42. The cooling water unit cooling capacity of the cooling section 4 is larger than that of the cooling water unit cooling capacity of the vacuum section 5, if the cooling capacity of a single nozzle of the vacuum section 5 is smaller than that of the first nozzle 42, the interval distance between the subsequent nozzles can be longer after the cooling section 4 is used for cooling, the length of the vacuum section 5 is larger than that of the cooling section 4, the cooling time of the vacuum section 5 can be longer, and the cooling time can be relatively slow cooling at the moment; this arrangement is also an important factor in ensuring good surface uniformity of the tubing 9 we produce.

In one embodiment of the utility model, the outlet end of the sizing section 3 is detachably connected with one end of the cooling section 4, and a sealing layer 6 is arranged between the outlet end and the cooling section. Specifically, through bolted connection, corresponding needs set up the bolt hole on each part, the shell of sizing section 3 and the shell fixed connection of cooling section 4. In order to improve the sealing performance and enhance the stability, a sealing layer 6, namely a sealing gasket or a sealing cushion is added; the sealing layer 6 can be silica gel, rubber or other sealing rings; the sealing ring can adopt a graphite gasket for flange surface connection.

In one embodiment of the utility model, the sizing section 3 comprises a through shell 31 and a sizing sleeve 34; the sizing sleeve 34 is sleeved along the axial direction of the shell 31; the outer wall of the sizing sleeve 34 is matched with the inner wall of the shell 31 to form a circulating water shell 32; or the shell 31 is provided with a circulating water shell layer 32 structure, and the outer wall of the sizing sleeve 34 is matched with the inner wall of the shell 31; the circulating water shell 32 is provided with two connection ports 33, one connection port 33 is communicated with the water inlet 52, the other connection port 33 is communicated with the water outlet 53, and the circulating water pump 7 circulates cooling water. The outer wall of the sizing sleeve 34 is cooled by cooling water in the circulating water shell layer 32, the pipe 9 is precooled, and the risk that deformation can be generated during chilling in the cooling section 4 is reduced.

The through small holes 35 can be formed to allow the outer wall of the pipe 9 to contact with the cooling water in the circulating water shell 32, so that the flow lubricity of the pipe 9 in the sizing sleeve 34 can be improved. The sizing sleeve 34 is provided with a small hole 35 penetrating through the inner wall and the outer wall; or the sizing sleeve 34 and the structural shell 31 with the circulating water shell layer 32 are provided with through small holes 35 at corresponding positions; so that the circulating water shell 32 is communicated with the inner cavity of the sizing sleeve 34.

In one embodiment of the present utility model, the water inlet 52 is provided with a filter screen 54 and a valve 55. The filter screen 54 is arranged to avoid the defects of pits, different colors and the like on the surface caused by the fact that impurities introduced into the cooling water impact the surface of the pipe 9 at a higher speed; the arrangement of the filter screen 54 can be made with reference to any prior art disclosed structure and manner of arranging a filter device on a pipeline; the lines used at the inlet 52 described herein are all conventional lines for fluid flow.

Furthermore, the water cooling mode is selected for cooling, the specific heat of water is large, the cost is relatively low, and the effect is good.

In one embodiment of the present utility model, a plurality of cooling rings 41 independent from each other are disposed in the cooling section 4, and the cooling rings 41 are provided with the first nozzles 42; the cooling rings 41 are respectively communicated with the water inlets 52. The whole working state keeps the pipe 9 passing through the axis of the whole equipment, i.e. keeps the same axis. In a more specific embodiment, 5 cooling rings 41 are arranged in the cooling section 4, and the first cooling ring 41, the second cooling ring 41, the third cooling ring 41, the fourth cooling ring 41 and the fifth cooling ring 41 are arranged in sequence along the conveying direction of the pipe 9. The plurality of cooling rings 41 are arranged, so that the spraying area for cooling is increased, the cooling effect is improved, the total length of the cooling rings 41 can be shortened, and the water hammer effect is reduced under the condition that the same or similar cooling effect is achieved; the annular cooling ring 41 can provide omnibearing spray and uniform cooling, and improves the surface contraction consistency of the pipe 9. The inlet of each cooling ring 41 arranged in the cooling section 4 is similar or identical to the length of the water inlet 52, so that cooling water can enter each cooling ring 41 at the same time, and the spraying pressure of spraying the cooling rings 41 can be ensured to be identical; acting on the surface of the pipe 9 more uniformly. The tightness of the nozzle can be adjusted to correct the spraying quantity.

In one embodiment of the utility model, the sizing section 3, the cooling section 4 and the vacuum section 5 are arranged coaxially, so that the consistency of the formed pipe 9 is ensured.

Still further, still provide a tubular product 9 extrusion molding device, including vacuum sizing device 2 and tubular product 9 extruder 1, tubular product 9 extruder 1 is used for extruding tubular product 9, and tubular product 9 external diameter is greater than sizing sleeve 34 internal diameter, tubular product 9 outer wall and sizing sleeve 34 inner wall interference fit, tubular product 9 enters vacuum sizing device 2 and carries out the cooling shaping; the forming device comprises two functions of extrusion and sizing forming.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A vacuum sizing device, comprising: sizing section, cooling section and vacuum section;

2. The vacuum sizing device of claim 1, wherein the sizing section outlet end is detachably connected to one end of the cooling section with a sealing layer disposed therebetween.

3. The vacuum sizing device according to claim 1, wherein the sizing section comprises a through shell and a sizing sleeve; the sizing sleeve is sleeved along the axial direction of the shell; the outer wall of the sizing sleeve is matched with the inner wall of the shell to form a circulating water shell; or the shell is provided with a circulating water shell structure, and the outer wall of the sizing sleeve is matched with the inner wall of the shell; the circulating water shell is provided with two connectors, one connector is communicated with the water inlet, the other connector is communicated with the water outlet, and cooling water is circulated through the circulating water pump.

4. A vacuum sizing device according to claim 3, wherein the sizing sleeve is provided with apertures through the inner and outer walls; or through small holes are formed in the corresponding positions of the sizing sleeve and the shell with the circulating water shell structure; so that the circulating water shell layer is communicated with the inner cavity of the sizing sleeve.

5. The vacuum sizing device of claim 1, wherein the cooling water unit cooling capacity of the cooling section is greater than the cooling water unit cooling capacity of the vacuum section.

6. A vacuum sizing device according to claim 1, wherein a filter screen and a valve are provided at the water inlet.

7. The vacuum sizing device according to claim 1, wherein a plurality of mutually independent cooling rings are arranged in the cooling section, and the cooling rings are provided with the first nozzles; the cooling rings are respectively communicated with the water inlets; in the working state, the pipe penetrates through the axis of the cooling ring.

8. A vacuum sizing apparatus according to claim 7, wherein the inlet of each cooling ring provided in the cooling section is of similar or identical length to the water inlet.

9. The vacuum sizing device of claim 1, wherein the sizing section, the cooling section, and the vacuum section are coaxially disposed.

10. A pipe extrusion molding device, characterized by comprising the vacuum sizing device according to any one of claims 1-9; a pipe extruder; the pipe extruder is used for extruding a pipe, the outer diameter of the pipe is larger than the inner diameter of the sizing sleeve, the outer wall of the pipe is in interference fit with the inner wall of the sizing sleeve, and the pipe enters the vacuum sizing device for cooling and shaping.