CN116945547A

CN116945547A - Mold structure, blowing needle, blowing device and manufacturing method of liner of pressure container

Info

Publication number: CN116945547A
Application number: CN202310740753.5A
Authority: CN
Inventors: 陈小功; 范雷; 瞿亚明
Original assignee: Canature Health Technology Group Co ltd
Current assignee: Canature Health Technology Group Co ltd
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2023-10-27

Abstract

The application discloses a mould structure, a blowing needle, a blowing device and a manufacturing method of a pressure container liner, wherein the mould structure is used for manufacturing the pressure container liner by a blowing process and comprises the following steps: the device is divided into six compression molding parts from top to bottom; the first compression molding part is used for forming a riser extension part of the pressure container; the second compression molding part is used for forming a riser part of the pressure container; the third compression molding part is used for forming a material containing part of the pressure container; the fourth compression molding part is used for forming a flanging part of the pressure container; the fifth compression molding part is used for forming the neck part of the pressure container; the sixth compression-molded portion is used for forming the body of the pressure vessel. The application can produce pressure vessels with various inner diameters, can form production identification marks in the pressure vessels in the production process, reduces the production difficulty of the pressure vessels and improves the production efficiency.

Description

Mold structure, blowing needle, blowing device and manufacturing method of liner of pressure container

Technical Field

The application relates to the field of water treatment, in particular to a die structure, a blowing needle, a blowing device and a manufacturing method of a pressure container liner of a wading device.

Background

The blow molding process is a processing process for hollow molding of plastic, and can mold a plastic blank in a molten state into the shape of an inner cavity of a mold. The traditional blow molding process mainly consists of five steps: blanking a blank (extruding a hollow plastic tube blank); 2 closing the mould with the cavity and cutting off the plastic blank; 3, blowing pressure air into the die through a blowing needle, and maintaining the pressure for a certain time; opening the mould and unloading the formed part; and 5, removing the blowing needle, and trimming the flash to obtain a finished product.

Along with the improvement of the living standard of people, wading products are more and more widely used by families, especially water heater products, and become a necessary choice at home. The water storage unit of the water heater is generally formed by welding metal sheet metal materials, and scale is prevented in the water storage unit in an enamel mode. However, in the continuous use process, the phenomena of welding seam leakage, corrosion, rust and scaling still exist, and solid particles generated by the problems can be gradually increased and accumulated, so that the defects of reduced heat efficiency, yellow water quality, reduced water yield and the like of the water heater are caused, and finally, the water heater is scrapped or the use of a customer is influenced. Especially, the problem of reduced thermal efficiency will produce more energy consumption, and increasing the energy consumption a little at such a wide product popularity rate means that the exponential energy consumption is wasted, which is not negligible.

The inner container made of the metal material has a plurality of defects in the use process, and the problem of excessive energy consumption in the production process (the enamel technology is formed at ultra-high temperature) is contrary to the national 'double carbon' target, so the trend of adopting novel substitute materials is imperative.

For the above reasons, composite pressure vessels resistant to high temperatures are a good alternative solution, but conventional composite pressure vessels require a series of adaptations to the structure of the composite pressure vessel for use in water heaters. For example, the composite pressure vessel and the water heater are connected by a connector. This requires the fabrication of non-standard pressure vessels of various inner diameters to accommodate the water heater connection requirements, the non-standard pressure vessels requiring a connection structure that provides the heating tube assembly, support for the connection, and sealing and pressure strength for production.

However, the prior blow molding process has the following technical defects in the process of manufacturing the pressure vessel to be solved;

1. the inner container of the pressure container with uniform caliber, multiple inner diameters and uniform wall thickness at each part is difficult to form;

2. the positioning point cannot be manufactured in the pressure container during blow molding production, the positioning point is manufactured in other working procedures, and the process for manufacturing the positioning point in the molded pressure container is high in difficulty and low in manufacturing efficiency.

3. The existing connecting piece supporting structure of the inner container of the pressure vessel cannot form the connecting piece supporting structure at one time in blow molding and manufacturing, and a special production tool.

Disclosure of Invention

In the summary section, a series of simplified form concepts are introduced that are all prior art simplifications in the section, which are described in further detail in the detailed description section. The summary of the application is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The application aims to solve the technical problem of providing a die structure, a blowing needle, a blowing device and a manufacturing method of a pressure container liner, wherein the die structure can be used for producing pressure container liners with various inner diameters, and can form liner connecting piece supporting knots (neck and flanging parts) and identification marks in one-step molding in the blowing production process.

In order to solve the technical problems, the application provides a mold structure for manufacturing a liner of a pressure container by a blow molding process;

the device is divided into six compression molding parts from top to bottom;

a first compression-molded part 1 for forming a riser extension 7 of the pressure vessel;

riser extension 7 extending upward from riser 8 of the pressure vessel; extending upward from the outlet 8 of the pressure vessel; the riser extension part 7 of the pressure container is a part cut off after the pressure container is molded, and the riser extension part 7 is designed to ensure that the flanging part of the liner is molded fully, smoothly and without defects;

a second compression-molded part 2 for forming a riser part 8 of the pressure vessel;

a third compression molding part 3 for forming a receiving part 9 of the pressure vessel;

a receiving portion 9 for providing a space for flowing the surplus material at the time of the production extrusion;

a fourth compression-molded portion 4 for forming a burring portion 10 of the pressure vessel;

a flange portion 10 formed as a mesa portion extending from a lower portion of the material accommodating portion 9 into the pressure vessel, a top surface of the mesa portion being used for manufacturing a production identification mark; the production identification mark is that a connecting hole is formed in the inner container for positioning subsequently, and the connecting hole is used for connecting and fixing the heating pipe component;

a fifth compression-molded part 5 for forming a neck 11 of the pressure vessel;

a neck 11 for receiving an external connection insert;

a sixth compression-molded portion 6 for forming the body 12 of the pressure vessel.

Optionally, the mold structure is further improved, and the inner diameter of the fifth compression molded part 5 is smaller than the inner diameter of the second compression molded part 2 is smaller than the inner diameter of the first compression molded part 1 is smaller than the inner diameter of the third compression molded part 3.

Optionally, the mold structure is further improved, and the production identification mark comprises a positioning part and/or a cutting part;

a positioning part for identifying the position of the subsequent machining structure;

and the cutting part is used for identifying and distinguishing a reserved part and a removed part of the subsequent machining.

Optionally, the mold structure is further improved, and the positioning part comprises a positioning hole, a positioning concave or a positioning convex;

and the cutting part comprises a boundary line of the flanging part and the extension part.

Alternatively, the mold structure is further improved, which is formed as a two-half structure.

In order to solve the above technical problems, the present application provides a blowing needle for use with the above mold structure, wherein an air passage is formed inside the blowing needle, comprising: dividing the needle tail 13 and five forming parts from top to bottom;

a first molding portion 14 which cooperates with the first compression molding portion 1 for forming the riser extension portion 7;

a second molding part 15 which closes the cavity of the mold and cuts off the preform in cooperation with the top of the second compression molding part 2;

a third molding portion 16 which cooperates with the second compression molding portion 2 to form a tap portion 8, and cooperates with the third compression molding portion 3 to form a receiving portion 9;

a fourth molding portion 17 that cooperates with the fourth compression molding portion 4 to form a burring portion 10, and that has a production identification mark manufacturing portion formed on a contact surface with the burring portion 10;

a fifth forming section 18, which is used to form the neck 11 of the pressure vessel, with the fifth compression forming section 5.

Optionally, the blowing needle of the mold structure is further improved, and the fourth forming part 17 is pressed against the fourth pressed forming part 4 in the vertical direction to form a production identification mark manufacturing part.

In order to solve the above technical problem, the present application provides a blow molding device having the mold structure and the blowing needle, further comprising:

the driving mechanism is connected with the needle tail and is used for driving the blowing needle to be inserted into or separated from the die structure;

and the controller is used for controlling the stroke of the driving mechanism device and the ventilation quantity of the external air source to the blowing needle.

In order to solve the technical problems, the application provides a manufacturing method of a pressure container liner by using the blow molding device, which comprises the following steps:

s1, pushing a blowing needle into a mold cavity;

s2, blanking a blank, wherein the length of the blank exceeds the length of a die cavity;

s3, closing the die, enabling the second molding part 15 to be in contact with the top of the second compression molding part 2, closing the inner cavity of the die, cutting off a blank, and immediately blowing in gas after the die closing is completed;

s4, maintaining pressure, and filling a batch blank between the fourth forming part 17 and the fourth compression forming part 4 in the process;

s5, pressure relief;

s6, pulling the blowing needle out of the die cavity, and keeping the pressure vessel on the blowing needle;

s7, opening the mould and taking down the inner container together with the blowing needle.

The technical scheme provided by the application at least can realize the following technical effects:

1. both the rotational molding process and the blow molding process are single-sided molding processes, and the flange portion and the neck portion of the liner can be molded, but the two portions cannot be well constrained in terms of size and shape retention, and thus cannot be well matched.

The prior blow molding process, the technician, firstly, is hard to think of using the change of the blowing needle structure to extrude the flanging of the mouth part and the neck part, and secondly, because the flange insert is a whole, the plastic blank in the traditional blow molding process cannot penetrate the inner diameter of the flange insert. It is therefore difficult to envisage using a blow-moulding process to produce a liner having flanging and neck characteristics. Thirdly, because there is no idea of the first two, it is difficult to think that the flange insert can be disassembled into two and sleeved outside the formed neck, and then the flange insert is reinforced by the winding layer, so that the pressure bearing capacity of the flange insert is maintained at a higher level, or one or two of the three points are considered, and it is still impossible to completely imagine how to use the blow molding process to produce the inner container of the pressure container with the flange and the neck structure. So far there is no application of this type of technology.

The mold structure, the blowing needle and the blowing device can be used for one-step molding in the blowing production to produce the pressure container liner with the flanging and neck structure. The application combines extrusion and blow molding by designing the blow needle structure and adopting extrusion molding for forming the mouth part of the blow molding piece. And further, the liner neck and flanging features with consistent wall thickness, flatness and stable size are formed, so that the liner neck and flanging features can have good matching degree when matched with the opponent piece. The flange and neck structure produced by the application have consistent wall thickness, are smooth and stable and controllable in size; and in the production process, a production identification mark can be formed on the top surface of the flanging, so that the production difficulty of the liner of the pressure container is reduced, and the production efficiency is improved. The neck of the pressure vessel liner can be used to externally attach inserts (e.g., flange inserts). The structure can solve the problem that the threaded port of the traditional composite pressure vessel and the heating pipe sealing cover of the water heater cannot be directly connected.

2. In the present application, the inventor further considers the characteristics of the blow molding process and the possible molding defect problem, and introduces riser characteristics: the riser feature continues to be extended outwardly based on the desired flanging feature. The riser feature also comprises a material containing area, so that in the process of closing the blowing needle and the die to extrude the blank, the excessive material can flow to the material containing area after the flanging feature is fully extruded, and the problem that the blank cannot be closed due to no position is avoided.

3. The mold structure, the blowing needle and the blowing device can directly form the production identification mark in the inner container of the pressure container in the blowing production. Compared with the scheme of manufacturing the production identification mark from the outside to the inside of the inner container of the pressure container after blow molding of the pressure container in the prior art, the scheme of the application reduces the production difficulty, omits the extra process step of manufacturing the production identification mark from the outside to the inside of the inner container of the pressure container, and improves the production efficiency.

4. The pressure container liner manufactured by the die structure, the blowing needle and the blow molding device can fill the space between the flanging part and the liner barrel opening, namely the neck part position, through the external connecting insert (such as the flange insert), so that the flanging part is supported, and the connection stability is improved. Carrying out

5. The thickness of the flanging part cannot be designed independently in the prior art, and the pressure at each position in the die is the same in the blow molding production process, so that the prior art can only form the liner of the pressure container with uniform thickness at each position. The thickness of the flanging part can be controlled by designing the distance between the fourth forming part and the fourth compression forming part in the vertical direction according to the requirement.

Drawings

The accompanying drawings are intended to illustrate the general features of methods, structures and/or materials used in accordance with certain exemplary embodiments of the application, and supplement the description in this specification. The drawings of the present application, however, are schematic illustrations that are not to scale and, thus, may not be able to accurately reflect the precise structural or performance characteristics of any given embodiment, the present application should not be construed as limiting or restricting the scope of the numerical values or attributes encompassed by the exemplary embodiments according to the present application. The application is described in further detail below with reference to the attached drawings and detailed description:

FIG. 1 is a schematic view of a first embodiment of the present application

Fig. 2 is a schematic view of the structure of the pressure vessel manufactured by the present application.

Fig. 3 is a schematic structural view of a second embodiment of the present application.

FIG. 4 is a schematic view of the positioning and cutting section positions of the present application.

FIG. 5 is a schematic view of the blow molding apparatus of the present application.

Description of the reference numerals

First compression molding part 1

Second compression molding part 2

Third compression molding part 3

Fourth compression molding part 4

Fifth compression molding part 5

Sixth compression molding part 6

Riser extension 7

Outlet portion 8

Material containing part 9

Flanging portion 10

Neck 11

Body 12

Minute hand tail 13

First forming part 14

Second molding part 15

Third forming section 16

Fourth forming part 17

Positioning portion 19.1

Cutting portion 19.2.

Drive mechanism 20

Blowing needle 21

Die structure 22

An inner container 23.

Detailed Description

Other advantages and technical effects of the present application will become more fully apparent to those skilled in the art from the following disclosure, which is a detailed description of the present application given by way of specific examples. The application may be practiced or carried out in different embodiments, and details in this description may be applied from different points of view, without departing from the general inventive concept. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. The following exemplary embodiments of the present application may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solution of these exemplary embodiments to those skilled in the art. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Like reference numerals refer to like elements throughout the several views.

A first embodiment;

referring to fig. 1 in combination with fig. 2, the present application provides a mold structure for manufacturing a pressure vessel liner by a blow molding process, comprising:

the device is divided into six compression molding parts from top to bottom;

riser extension 7 extending upward from riser 8 of the pressure vessel;

a flange portion 10 formed as a mesa portion extending from a lower portion of the material accommodating portion 9 into the pressure vessel, a top surface of the mesa portion being used for manufacturing a production identification mark; referring to fig. 4, the production identification mark located on the burring part 10 is seen downward from above the pressure vessel

A neck 11 for receiving an external connection insert;

a fifth compression-molded part 5 for forming a neck 11 of the pressure vessel;

a sixth compression-molded portion 6 for forming a body 12 of the pressure vessel;

wherein, the inner diameter of the fifth compression molding part 5 is larger than the inner diameter of the first compression molding part 1, larger than the inner diameter of the second compression molding part, and larger than the inner diameter of the fourth compression molding part.

Fig. 2 depicts only a portion of the upper body of the pressure vessel, with the lower body omitted, but the lower body is not an improvement of the present application and therefore only a portion of the body is shown.

Optionally, the production identification mark comprises a positioning part and/or a cutting part;

positioning portions 19.1 for identifying the position of the subsequent machined structure, e.g. for identifying the position of the hole when the hole is to be drilled

A cutting 19.2 for identifying the remaining and removed areas of the subsequent machining, for example a cutting line.

Alternatively, the mold structure is formed as a two-half structure.

Furthermore, it will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments of the present application.

A second embodiment;

referring to fig. 3 in combination with fig. 2, the present application provides a blowing needle used in cooperation with the mold structure of the first embodiment, in which an air passage is formed therein, which divides the tail 13 of the needle from top to bottom and five molding parts;

a fifth forming portion 18, which is used to form the neck portion 11 of the pressure vessel, with the fifth compression forming portion 5;

wherein the fourth forming portion 17 is pressed in the vertical direction against the fourth press forming portion 4 to form a production identification mark manufacturing portion.

A third embodiment;

referring to fig. 5, the present application provides a mold structure according to a first embodiment and a blow molding apparatus of a blow pin according to a second embodiment, further comprising:

a driving mechanism 20 connected with the needle tail 13 for driving the blowing needle 21 to insert into or separate from the mold structure 22;

a controller (not shown) for controlling the travel of the drive mechanism 20 and the amount of air provided by the external air source to the needle.

A fourth embodiment;

the application provides a manufacturing method of a pressure container liner by using a blow molding device according to a third embodiment, comprising the following steps:

s1, pushing a blowing needle into a mold cavity through a driving mechanism, wherein the mold is in an open state;

s2, blanking a blank, wherein the blank is made of a circular material, and the length of the blank exceeds that of a die cavity;

s4, maintaining pressure, wherein a cooling water path is arranged in the die body, so that the die can be rapidly cooled; in the process, the fourth forming part 17 and the fourth compression forming part 4 are filled with batch blanks;

s5, after the pressure is released and the air pressure is released, the inner container can shrink rapidly, and the surface of the inner container is separated from the die. If the support is not provided, the contraction degree is uncontrollable, but the size stability of the flanging part and the neck part is better because the blowing needle is provided for supporting;

s7, opening the die, taking down the inner container together with the blowing needle, and because the blowing needle is separated from the inner container, an operator can conveniently separate the inner container from the blowing needle to obtain a molded inner container (the molded inner container is provided with a riser at the moment), and executing subsequent machining according to requirements.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The present application has been described in detail by way of specific embodiments and examples, but these should not be construed as limiting the application. Many variations and modifications may be made by one skilled in the art without departing from the principles of the application, which is also considered to be within the scope of the application.

Claims

1. The utility model provides a mould structure, its is used for blowing technology manufacturing pressure vessel inner bag which characterized in that:

the device is divided into six compression molding parts from top to bottom;

a first compression-molded part (1) for forming a riser extension (7) of the pressure vessel;

riser extension parts (7) extending upwards from riser parts (8) of the pressure vessel;

a second compression molding section (2) for forming a riser section (8) of the pressure vessel;

a third compression molding part (3) for forming a receiving part (9) of the pressure vessel;

a receptacle (9) for providing a flow space for excess material during extrusion;

a fourth compression-molded part (4) for forming a burring part (10) of the pressure vessel;

a flange part (10) which is formed as a table part extending from the lower part of the material containing part (9) into the pressure container, and the top surface of the table part is used for manufacturing a production identification mark;

a fifth compression-molded part (5) for forming a neck part (11) of the pressure vessel;

a neck (11) for receiving an external connection insert;

and a sixth compression-molded part (6) for forming the body (12) of the pressure vessel.

2. The mold structure of claim 1, wherein: the inner diameter of the fifth compression molding part (5) is smaller than the inner diameter of the second compression molding part (2), smaller than the inner diameter of the first compression molding part (1) and smaller than the inner diameter of the third compression molding part (3).

3. The mold structure of claim 1, wherein: the production identification mark comprises a positioning part and/or a cutting part;

4. A mold structure as in claim 3, wherein: the positioning part comprises a positioning hole, a positioning concave or a positioning convex;

5. The mold structure of claim 1, wherein: it is formed as a two-half structure.

6. A blowing needle for use with the mold structure of claim 1 having an air passage formed therein, characterized in that: dividing the needle tail (13) and five forming parts from top to bottom;

a first molding section (14) that cooperates with the first compression molding section (1) to form a riser extension section (7);

the second molding part (15) is matched with the top of the second compression molding part (2) to seal the inner cavity of the die and cut off the blank;

a third molding part (16) which is matched with the second compression molding part (2) to form a riser part (8), and is matched with the third compression molding part (3) to form a material containing part (9);

a fourth molding section (17) that cooperates with the fourth compression molding section (4) to form a burring section (10) and that has a production identification mark manufacturing section formed on the surface that contacts the burring section (10);

a fifth forming section (18) which is in contact with the fifth compression forming section (5) for forming the neck (11) of the pressure vessel.

7. A blowing needle for the mold structure of claim 6, wherein: the fourth forming part (17) is pressed to the fourth pressed forming part (4) in the vertical direction to form the production identification mark manufacturing part.

8. A blow molding apparatus having the mold structure of claim 1 and the blow pin of claim 6, further comprising:

9. A method of manufacturing a pressure vessel liner using the blow molding apparatus of claim 8, comprising the steps of:

s1, pushing a blowing needle into a mold cavity;

s3, closing the die, enabling the second molding part (15) to be in contact with the top of the second compression molding part (2), closing the inner cavity of the die, cutting off a blank, and immediately blowing in gas after the die is closed;

s4, maintaining pressure, wherein a batch blank is filled between the fourth forming part (17) and the fourth compression forming part (4) in the process;

s5, pressure relief;