CN113183424B

CN113183424B - Spiral blowing die, demolding forming process and tubular element

Info

Publication number: CN113183424B
Application number: CN202110429646.1A
Authority: CN
Inventors: 刘志军; 马奔; 胡吉龙
Original assignee: Dongguan Kewei Medical Instrument Co Ltd
Current assignee: Dongguan Kewei Medical Instrument Co Ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2023-05-02
Anticipated expiration: 2041-04-21
Also published as: CN113183424A

Abstract

The invention discloses a spiral blowing mould which comprises a mould core, a spiral forming assembly and a blowing forming assembly, wherein a forming cavity is formed in the mould core, the spiral forming assembly comprises a first forming part and a spiral part, the first forming part is provided with a first forming end and a spiral end which are connected, the first forming end is positioned in the forming cavity, the spiral end is exposed out of the mould core, the spiral part is sleeved outside the spiral end and is in threaded connection with the spiral end, the blowing forming assembly is provided with a blowing channel, and the blowing channel faces the first forming end; the invention also discloses a demolding molding process and a tubular element. The damage caused when the injection molding product is demolded is avoided, the smooth demolding of the injection molding product is realized, and the quality of the injection molding product is ensured.

Description

Spiral blowing die, demolding forming process and tubular element

Technical Field

The invention relates to the technical field of reducer union injection molds, in particular to a spiral blowing mold, a demolding molding process and a tubular element.

Background

The plastic product is difficult to demold, which is a common problem in the injection molding process, once the plastic product is difficult to demold, the size and the appearance of the plastic product are difficult to ensure, so that in order to enable the plastic product to be demolded more smoothly, a certain demolding slope is required to be made on the product in the design process of the plastic product to reduce the demolding difficulty, and meanwhile, a corresponding ejection device is required to be made on a mold to assist the product to be demolded, or the purpose of demolding is achieved by means of a demolding agent; however, due to the structural characteristics and material selection of some injection molding products, the products just touch the demolding pain point of the injection molding process, such as soft product materials, thin wall, no demolding inclination, high surface smoothness and incapability of using a soft rubber tubular product of a demolding agent, the products are easily adsorbed on a mold core or a mold cavity in the injection molding process, and the products are strained in the mold opening process. For this industry, some solutions for injection molding and demolding of soft rubber tubular products are proposed, such as: the mold core material adopts the exhaust steel, and when the product is demolded, the mold is demolded in a mode of blowing towards the mold core, but the product cannot be separated from the core shaft due to the limited exhaust gas amount of the exhaust steel, and the inner surface of the injection molded product has low smoothness and is abandoned. The other kind adopts the dabber to plate the Teflon technology and has certain effect to the drawing of patterns, but plate the Teflon and adhere to the dabber and have certain life-span restriction, the condition that can appear droing for a long time can't use for a long time, still another kind adopts the mode of blowing to assist the drawing of patterns in one side or two sides of hose form product, and the side blowing has certain help to the drawing of patterns of product, but the blowing still can not sustainable production, and occasionally still can appear the problem of strain product. For example, the publication number CN111716648A, the patent name is a spiral blowing mold, a demolding molding process and an invention patent of a tubular element, and in the demolding molding process disclosed in the publication, demolding is assisted by single-side or double-side blowing, but in practical application, the mold core and the injection molding product are tightly attached, vacuum adsorption is caused between the mold core and the injection molding product, and the mold core and the injection molding product cannot be separated quickly by separate blowing, so that the problem of pulling the product occurs in demolding.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a spiral blowing mold, a demolding forming process and a tubular element.

The invention discloses a spiral blowing mould, which comprises:

the die core is internally provided with a forming cavity;

the spiral forming assembly comprises a first forming piece and a spiral piece, wherein the first forming piece is provided with a first forming end and a spiral end which are connected, the first forming end is positioned in a forming cavity, the spiral end is exposed out of a die core, and the spiral piece is sleeved outside the spiral end and is in spiral connection with the spiral end; and

a blow molding assembly having a blow channel facing the first molding end.

According to one embodiment of the invention, the blow molding assembly comprises a second molding member, the blow passage is arranged in the second molding member, the second molding member is provided with a second molding end, the second molding end is positioned in the molding cavity, is opposite to and connected with the first molding end, and is matched with the first molding end to form a clearance passage, and the blow passage is communicated with the molding cavity through the clearance passage.

According to an embodiment of the invention, the first shaped end is provided with a protrusion and the second shaped end is provided with a recess, the opening of the blow channel being located in the recess, the protrusion being located in the recess and facing the blow channel.

According to one embodiment of the invention, the spiral forming assembly further comprises a core pulling power piece, wherein the core pulling power piece is connected with the spiral end and drives the spiral end to linearly move, and the linearly moving spiral end rotates under the action of the spiral piece and drives the first forming end to rotate.

According to one embodiment of the invention, the spiral end is provided with a spiral part and a rotating part, one end of the spiral part is connected with the first molding end, the other end of the spiral part is connected with the rotating part, and the spiral piece is sleeved outside the spiral part; the core pulling power piece comprises a rotation bearing part and a power part, wherein the rotation bearing part is rotatably borne by the rotation bearing part, and the power part is connected with the rotation bearing part.

According to an embodiment of the present invention, the blow molding assembly further includes a sliding carrier slidably connected to the mold core, and the second molding member is connected to the sliding carrier.

A demolding and forming process comprising:

injecting molding materials into the molding cavity of the mold core to make the tubular element injection molded in the molding cavity;

and blowing the blowing channel, extracting the first molding piece outwards, rotating the spiral end in the spiral piece, driving the first molding end to rotate, and extracting the second molding piece outwards.

According to an embodiment of the present invention, extracting the first molding member outward, the screw end rotating in the screw member, driving the first molding end to rotate includes:

the power part drives the rotary bearing part to linearly move along the first direction, the rotary bearing part drives the spiral part to linearly move, and the spiral part drives the first forming end to be pulled out from the forming cavity; at the same time, the rotating part rotates in the rotating bearing part, the spiral part rotates in the spiral piece, and the spiral part drives the first forming end to rotate.

According to an embodiment of the present invention, extracting the second molded part outward includes: the sliding bearing piece moves linearly along the second direction, and the sliding bearing piece drives the second molding piece to be pulled out of the molding cavity.

A tubular element made by the above-described demolding process.

The beneficial effects of the invention are as follows: the spiral piece and the spiral end are matched to realize the rotary extraction of the first forming end, so that vacuum adsorption is avoided between the injection molded product and the first forming end of the forming cavity, in addition, the air flow is blown into the position between the first forming end and the injection molded product through the blowing channel, the separation between the injection molded product and the first forming end is further assisted, the damage to the injection molded product with thin wall type is avoided when the injection molded product is extracted from the first forming end, the smooth demolding of the injection molded product is realized, and the quality of the injection molded product is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic view of a spiral blow mold in an embodiment;

FIG. 2 is a cross-sectional view of a spiral blow mold in an embodiment;

FIG. 3 is an enlarged view of portion A of FIG. 2 in an embodiment;

FIG. 4 is a flow chart of a demolding process in an embodiment.

Detailed Description

Various embodiments of the invention are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the invention. That is, in some embodiments of the invention, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

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

In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the invention solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. 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 invention.

For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:

example 1

Referring to fig. 1 to 3, fig. 1 is a schematic structural view of a spiral blow mold according to an embodiment, fig. 2 is a sectional view of the spiral blow mold according to an embodiment, and fig. 3 is an enlarged view of a portion a of fig. 2 according to an embodiment. The spiral blow mold in the embodiment comprises a mold core 1, a spiral forming assembly 2 and a blow forming assembly 3. The mold core 1 has a molding cavity 11 therein. The screw molding assembly 2 comprises a first molding member 21 and a screw member 22, wherein the first molding member 21 is provided with a first molding end 211 and a screw end 212 which are connected, the first molding end 211 is positioned at one end of the molding cavity 11, the screw end 212 is exposed out of the mold core 1, and the screw member 22 is sleeved outside the screw end 212 and is in screw connection with the screw end 212. The blow molding assembly 3 has a blow channel 311, the blow channel 311 facing the first molding end 211. The air blowing channel 311 blows air directly from the outside of the mold core 1 to the first molding end 211 in the molding cavity 11.

Preferably, the blow molding assembly 3 includes a second molding member 31, the blow passage 311 is formed in the second molding member 31, the second molding member 31 has a second molding end 312, the second molding end 312 is located in the molding cavity 11 opposite to and connected to the first molding end 211, and the second molding end 312 and the first molding end 211 cooperate to form a gap passage 4, and the blow passage 311 is communicated with the molding cavity 11 through the gap passage 4.

The first molding end 211 of the first molding member 21 and the second molding end 312 of the second molding member 31 are connected in the molding cavity 11, so that a structure is formed that the molding cavity 11 is sleeved outside the first molding end 211 and the second molding end 312, when the molten injection molding material is injected into the molding cavity 11, the molten injection molding material can flow and disperse and is coated outside the first molding end 211 and the second molding end 312, and after cooling, an injection molding product is formed, and the injection molding product in the embodiment is a thin-wall tubular element. The tubular element is injection molded in the molding cavity 11 and is sleeved outside the first molding end 211 and the second molding end 312, and the first molding end 211 and the second molding end 312 need to be pulled away during demolding. In the rotary blowing mold of the embodiment, the first molding end 211 is rotationally pulled away by matching the spiral piece 22 and the spiral end 212, so that vacuum adsorption between the injection molded product in the molding cavity 11 and the first molding end 211 is avoided, meanwhile, the blowing channel 311 is blown, and air flow enters a position between the first molding end 211 and the injection molded product through the clearance channel 4, so that separation between the injection molded product and the first molding end 211 is further assisted, damage to the thin-wall injection molded product when the injection molded product is pulled away from the first molding end 211 is avoided, smooth demolding of the injection molded product is realized, and quality of the injection molded product is ensured. In this embodiment, the length of the second molding end 312 is much smaller than that of the first molding end 211, and when the air blowing channel 311 blows air, the air flow can enter the position between the second molding end 312 and the injection molding product through the gap channel 4, so that the shorter second molding end 312 is smoothly separated from the injection molding product, and the second molding end 312 is assisted to be pulled out. In a specific application, it is necessary to provide a longer first forming end 211 and a shorter second forming end 312 corresponding to the forming of the tubular element, and two auxiliary demolding and separating means of rotation and blowing are performed on the first forming end 211 with a longer demolding and separating distance, so that the first forming end 211 and the tubular element can be rapidly separated, and the tubular element can be damaged to complete the separating action. The specific ratio between the first forming end 211 and the second forming end 312 may be determined according to practical situations.

Referring back to fig. 1 and 2, further, the molding cavity 11 is a tubular cavity formed in the mold core 1, and the molding cavity 11 is located near the middle of the mold core 1. The size and shape of the molding cavity 11 are adapted to the size and shape of the tubular element to be injection molded. The mold core 1 further includes an injection runner 12. The injection runner 12 is disposed in the mold core 1 and is communicated with the molding cavity 11, and the molten injection material enters the molding cavity 11 through the injection runner 12, and then is coated outside the first molding end 211 and the second molding end 312, and after cooling, the molten injection material becomes a tubular element sleeved outside the first molding end 211 and the second molding end 312. The injection molding material in this example is polyurethane (TPU).

In this embodiment, the first molding end 211 of the first molding member 21 and the second molding end 312 of the second molding member 31 are both mandrels, the central axis of the first molding end 211, the central axis of the second molding end 312 and the central axis of the molding cavity 11 overlap, and the diameters of the first molding end 211 and the second molding end 312 are smaller than the diameter of the molding cavity 11. Preferably, the diameter of the first molding end 211 gradually increases from a direction approaching the second molding end 312 toward a direction separating from the second molding end 312. Preferably, the diameter of the second molding end 312 gradually increases from a direction closer to the first molding end 211 toward a direction away from the first molding end 211. The progressive diameter design of the first and second shaped ends 211, 312 further facilitates demolding of the first and second shaped ends 211, 312.

Referring back to fig. 2 and 3, further, the first molding end 211 is provided with a protrusion 2111, the second molding end 312 is provided with a recess 3121, the opening of the air blowing passage 311 is located in the recess 3121, and the protrusion 2111 is located in the recess 3121 and faces the air blowing passage 311. By the cooperation of the protrusions 2111 and the recesses 3121, the gap passage 4 is formed in the space between the protrusions 2111 and the recesses 3121, the longitudinal section of the entire gap passage 4 is approximately in a shape of a "several", and the air flow blown from the air blowing passage 311 is first applied to the protrusions 2111 and then is branched toward the periphery of the protrusions 2111, so that the air flow is dispersed to uniformly blow to a position between the inner wall of the tubular member and the outer wall of the first molding end 211 and to a position between the inner wall of the tubular member and the outer wall of the second molding end 312, and the effect of separating the tubular member from the first molding end 211 and the second molding end 312 is promoted. Specifically, the protrusion 2111 is a protrusion formed on the end surface of the first molding end 211, in this embodiment, a protrusion in the shape of a truncated cone, and the recess 3121 is a groove formed on the end surface of the second molding end 312, in this embodiment, a groove in the shape of a truncated cone. Preferably, the central axis of the protrusion 2111 overlaps the central axis of the recess 3121. Preferably, the air blowing passage 311 is an air flow passage which is opened inside the second molding end 312 along the central axis direction of the second molding end 312, the cross section of the air blowing passage 311 is circular, and the central axis of the air blowing passage 311, the central axis of the protrusion 2111, and the central axis of the recess 3121 overlap.

Referring back to fig. 1 and 2, further, the spiral forming assembly 2 further includes a core-pulling power member 23, where the core-pulling power member 23 is connected to the spiral end 212, and drives the spiral end 212 to linearly move, and the linearly moving spiral end 212 rotates under the action of the spiral member 22 and drives the first forming end 211 to rotate. The screw end 212 has a screw portion 2121 and a rotating portion 2122, one end of the screw portion 2121 is connected to the first molding end 211, the other end of the screw portion 2121 is connected to the rotating portion 2122, and the screw 22 is sleeved outside the screw portion 2121; the loose core power element 23 includes a rotation bearing portion 231 and a power portion 232, the rotation portion 2122 is rotatably borne on the rotation bearing portion 231, and the power portion 232 is connected to the rotation bearing portion 231. By the cooperation of the screw 22 and the screw 2121, the first forming end 211 is rotated while moving under the action of the power unit 232, so that the first forming end 211 is smoothly removed.

Specifically, the first molding end 211, the screw portion 2121, and the rotational portion 2122 are integrally connected, and preferably, a central axis of the first molding end 211, a central axis of the screw portion 2121, and a central axis of the rotational portion 2122 overlap. The screw 2121 is a threaded rod with threads on the outer wall, the screw 22 is a sleeve with threads on the inner wall, the threads on the inner wall of the screw 22 are matched with the threads on the outer wall of the screw 2121, the screw 22 is sleeved outside the screw 2121, and when the screw 22 is fixed, the screw 2121 is pulled to linearly move, and the screw 2121 can rotate helically relative to the screw 22. In this embodiment, one end of the screw member 22 is embedded and fixed in the mold core 1, the other end of the screw member 22 extends away from the mold core 1, the first forming end 211 extends out of the forming cavity 11 for a certain distance and is integrally connected with one end of the screw portion 2121, and the other end of the screw portion 2121 passes through the inner cavity of the screw member 22 and is integrally connected with the rotating portion 2122. The diameter of the screw 2121 in this embodiment is larger than the diameter of the first forming end 211. The rotating portion 2122 includes a rotating shaft 21221 and a stopper 21222, the rotating shaft 21221 is connected to the screw portion 2121, the stopper 21222 is sleeved outside the rotating shaft 21221, the stopper 21222 is rotationally connected to the rotating shaft 21221, the stopper 21222 and the rotating shaft 21221 cannot move in the axial direction, and the stopper 21222 limits the axial direction of the rotating shaft 21221. A limiting cavity 2311 is formed in the rotation bearing part 231, a limiting block 21222 is arranged in the limiting cavity 2311, and the rotating shaft 21221 passes through the limiting cavity 2311 and the rotation bearing part 231 and is integrally connected with the spiral part 2121. The power part 232 is a cooperation of a traction block and a cylinder, one end of the traction block is embedded in the rotation bearing part 231, and the other end of the traction block is connected with the cylinder. The cylinder drives, drive the traction block to move along first direction linearity, the traction block drives the rotation bearing part 231 to move linearly, the rotation bearing part 231 drives the limit block 21222 to move linearly through the limit cavity 2311, the limit block 21222 drives the rotary shaft 21221 to move linearly, the rotary shaft 21221 drives the spiral part 2121 to move linearly, the spiral part 2121 finally drives the first forming end 211 to move linearly along the first direction, meanwhile, the spiral piece 22 acts on the spiral part 2121, the linearly moving spiral part 2121 rotates, the first forming end 211 is driven to rotate synchronously, and therefore the first forming end 211 moves linearly and rotates synchronously, and the drawing and demolding of the first forming end 211 are achieved smoothly. The rotation bearing 231 in this embodiment is block-shaped.

Preferably, the first molding member 21 is provided with a cooling water channel 213. Through the setting of cooling water course 213 for the cooling water enters into first shaping end 211, carries out quick cooling to the injection molding product, the shaping of the injection molding product of being convenient for. Specifically, one end of the cooling water channel 213 is located in the end of the first molding end 211 near the second molding end 312, and the other end of the cooling water channel 213 sequentially passes through the first molding end 211, the spiral portion 2121 and the rotating shaft 21221 and then communicates with the cooling water channel opening 2131 formed in the rotating bearing portion 231. The external cooling water enters the cooling water channel 213 through the cooling water channel opening 2131.

Referring back to fig. 1 and 2, further, the blow molding assembly 3 further includes a sliding carrier 32, the sliding carrier 32 is slidably connected to the mold core 1, and the second molding member 31 is connected to the sliding carrier 32. The sliding bearing piece 32 is arranged so as to facilitate the movement of the second molding piece 31, thereby facilitating the drawing and demolding of the second molding end 312. Specifically, the sliding carrier 32 is a slider, one end of which is slidably connected to the mold core 1, and the other end of which is exposed to the mold core 1, and the sliding carrier 32 can slide along the central axis of the second molding end 312. One end of the second molding member 31 far away from the second molding end 312 is embedded in the sliding carrier 32, and an external driving member, such as an air cylinder, is connected to the sliding carrier 32, and pulls the sliding carrier 32 to be far away from the mold core 1 along the second direction, so as to drive the second molding end 312 of the second molding member 31 to be far away from the molding cavity 11, and realize the drawing and demolding of the second molding end 312 along the second direction. The first direction and the second direction in this embodiment are opposite directions on the central axis of the first molding end 211.

In order to improve injection molding and demolding efficiency, the spiral blowing mold in the embodiment is provided with double injection molding stations, wherein the number of the molding cavities 11 is two, the two molding cavities 11 are arranged side by side, the injection molding runner 12 is respectively communicated with the two molding cavities 11, and the numbers of the first molding piece 21, the spiral piece 22 and the second molding piece 31 are the same as the number of the molding cavities 11, so that the molding cavities 11, the first molding piece 21, the spiral piece 22 and the second molding piece 31 form one molding and demolding station, two molding stations can be formed in the mold core 1, and two tubular elements can be injection molded at one time, thereby improving injection molding efficiency.

The demolding process of the spiral blow mold in this embodiment is as follows: the tubular member is injection molded into the molding cavity 11 and is sleeved outside the first molding end 211 and the second molding end 312. When demolding is carried out, the blowing mechanism communicated with the blowing channel 311 is started, so that air flow firstly enters the blowing channel 311 to blow, the air flow enters the position between the tubular element and the first forming end 211 and the position between the tubular element and the second forming end 312, meanwhile, the air cylinder and the power part 232 connected with the sliding bearing piece 32 start to drive, the sliding bearing piece 32 drives the second forming end 312 to be far away from the first forming end 211, the power part 232 drives the first forming end 211 to be far away from the second forming end 312, the spiral piece 22 acts on the spiral part 2121, and the first forming end 211 synchronously rotates, so that the first forming end 211 and the second forming end 312 are respectively and smoothly pulled out of the tubular element, and the tubular element is not damaged. The spiral blowing mould in the embodiment can solve the problems of vacuum adsorption sticking of the mould core of the tubular element which is soft, high in smoothness, free of demoulding inclination and free of demoulding auxiliary agent, and has low injection molding cost.

Example two

Referring to fig. 4, fig. 4 is a flowchart of a demolding molding process in an embodiment. The demolding and forming process in the embodiment is realized based on the spiral blowing mold in the first embodiment, and comprises the following steps of:

s1, injecting molding materials into the molding cavity 11 of the die core 1, so that the tubular element is injection molded in the molding cavity 11.

S2, blowing the blowing channel 311, and extracting the first molding piece 21 outwards, so that the screw end 212 rotates in the screw piece 22 to drive the first molding end 211 to rotate, and extracting the second molding piece 31 outwards.

Wherein, extracting the first molding member 21 outwards, so that the screw end 212 rotates in the screw member 22, driving the first molding end 211 to rotate includes: the power part 232 drives the rotary bearing part 231 to linearly move along the first direction, the rotary bearing part 231 drives the spiral part 2121 to linearly move, and the spiral part 2121 drives the first forming end 211 to be drawn out of the forming cavity 11; at the same time, the rotating portion 2122 rotates in the rotation bearing portion 231, the screw portion 2121 rotates in the screw 22, and the screw portion 2121 drives the first molding end 211 to rotate.

In this embodiment, the air blowing channel 311 is blown in synchronization with the drawing of the first molded part 21, or the air blowing channel 311 is blown first and then the first molded part 21 is drawn.

Wherein extracting the second molding member 31 outward includes: the sliding carrier 32 is linearly moved along the second direction, and the sliding carrier 32 drives the second molding member 31 to be pulled out from the molding cavity 11.

The action of extracting the second molding member 31 outward in the present embodiment is that after the air blowing passage 311 is blown, the action of extracting the second molding member 31 outward may be performed in synchronization with the action of extracting the first molding member 21 outward.

By the cooperation of the screw end 212 and the screw member 22, in the process of demolding and drawing-off of the first molding end 211, the movement action and the rotation action of the first molding end 211 are synchronously performed, and the air blowing channel 311 is further blown, so that air flow is blown into the area between the tubular element and the first molding end 211, and the injection molded tubular element and the first molding end 211 are smoothly separated and separated.

The detailed execution of steps S1 and S2 can be described with reference to the first embodiment, and will not be repeated here. The tubular element can be manufactured by adopting the demolding molding process in the second embodiment, and the manufactured tubular element has no strain or deformation, and the molded finished product has high quality.

In conclusion, the spiral piece and the spiral end are matched to realize the rotary extraction of the first molding end, so that vacuum adsorption between a product injection molded in the molding cavity and the first molding end is avoided, meanwhile, the air flow is blown into the air blowing channel, enters the position between the first molding end and the injection molded product through the clearance channel, the separation between the injection molded product and the first molding end is further assisted, the damage to the thin-wall injection molded product when the injection molded product is extracted from the first molding end is avoided, the smooth demolding of the injection molded product is realized, and the quality of the injection molded product is ensured.

The above are merely embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present invention, should be included in the scope of the claims of the present invention.

Claims

1. A spiral blow mold, comprising:

a mold core (1) having a molding cavity (11) therein;

the spiral forming assembly (2) comprises a first forming piece (21) and a spiral piece (22), wherein the first forming piece (21) is provided with a first forming end (211) and a spiral end (212) which are connected, the first forming end (211) is positioned in the forming cavity (11), the spiral end (212) is exposed out of the die core (1), and the spiral piece (22) is sleeved outside the spiral end (212) and is in spiral connection with the spiral end (212); and

a blow molding assembly (3) having a blow channel (311), the blow channel (311) facing the first molding end (211);

the blow molding assembly (3) comprises a second molding piece (31), the blow channel (311) is formed in the second molding piece (31), the second molding piece (31) is provided with a second molding end (312), the second molding end (312) is positioned in the molding cavity (11) and is opposite to and connected with the first molding end (211), a clearance channel (4) is formed between the second molding end (312) and the first molding end (211) in a matching way, and the blow channel (311) is communicated with the molding cavity (11) through the clearance channel (4);

the first forming end (211) is provided with a convex part (2111), the second forming end (312) is provided with a concave part (3121), the opening of the air blowing channel (311) is positioned in the concave part (3121), and the convex part (2111) is positioned in the concave part (3121) and faces the air blowing channel (311);

the spiral forming assembly (2) further comprises a core pulling power piece (23), the core pulling power piece (23) is connected with the spiral end (212) and drives the spiral end (212) to linearly move, and the linearly moved spiral end (212) rotates under the action of the spiral piece (22) and drives the first forming end (211) to rotate;

the screw end (212) is provided with a screw part (2121) and a rotating part (2122), one end of the screw part (2121) is connected with the first forming end (211), the other end of the screw part (2121) is connected with the rotating part (2122), and the screw (22) is sleeved outside the screw part (2121); the core pulling power piece (23) comprises a rotation bearing part (231) and a power part (232), wherein the rotation part (2122) is rotatably borne by the rotation bearing part (231), and the power part (232) is connected with the rotation bearing part (231).

2. Spiral blow mould according to claim 1, characterized in that the blow moulding assembly (3) further comprises a sliding carrier (32), the sliding carrier (32) being slidingly connected to the mould core (1), the second moulding (31) being connected to the sliding carrier (32).

3. A demolding process using the spiral blow mold according to any one of claims 1 to 2, comprising:

injecting molding material into the molding cavity (11) of the mold core (1) so that the tubular element is injection molded in the molding cavity (11);

blowing the blowing channel (311) to draw the first molding piece (21) outwards, so that the spiral end (212) rotates in the spiral piece (22), drives the first molding end (211) to rotate, and draws the second molding piece (31) outwards;

extracting the first molding member (21) outwards, so that the spiral end (212) rotates in the spiral member (22), and driving the first molding end (211) to rotate comprises:

the power part (232) drives the rotary bearing part (231) to linearly move along a first direction, the rotary bearing part (231) drives the spiral part (2121) to linearly move, and the spiral part (2121) drives the first forming end (211) to be pulled out of the forming cavity (11); at the same time, the rotating part (2122) rotates in the rotating bearing part (231), the spiral part (2121) rotates in the spiral piece (22), and the spiral part (2121) drives the first forming end (211) to rotate.

4. A demolding molding process according to claim 3, characterized in that extracting the second molded piece (31) outwards comprises: the sliding bearing piece (32) is linearly moved along the second direction, and the sliding bearing piece (32) drives the second forming piece (31) to be pulled out of the forming cavity (11).

5. A tubular element, characterized in that it is produced by the demolding process according to any one of claims 3-4.