CN112297382A - Injection molding equipment of hollow pipe fitting - Google Patents

Abstract

The invention discloses injection molding equipment for hollow pipe fittings, and belongs to the field of injection molding equipment. The device comprises an injection molding machine, a cooling and shaping unit, a traction unit and a cutting unit; be equipped with injection mold on the injection molding machine, injection mold includes: die sleeve; the taper angle hole section is arranged in the middle of one end face of the die sleeve along the central axis direction of the die sleeve; the diameter bearing hole section is arranged in the middle of the other end face of the die sleeve along the central axis direction of the die sleeve and is communicated with the taper angle hole section; the mold core is connected with the mold sleeve and comprises a conical section which is arranged in the conical angle hole section; and one end of the core section is connected with the conical section, and the other end of the core section penetrates through the diameter bearing hole section and extends out of the die sleeve. The injection mould on the injection molding machine can rapidly form hollow pipe fittings with uniform density and smooth surfaces, can accurately guide injection molding products to enter the cooling and shaping unit for forming, avoids the accumulation of the injection molding products through the traction unit, finally obtains the required length of the hollow pipe fittings through the cutting unit, and has the characteristics of high production efficiency and high product quality.

Description

Injection molding equipment of hollow pipe fitting

Technical Field

The invention belongs to the technical field of injection molding equipment, and particularly relates to injection molding equipment for a hollow pipe fitting.

Background

Injection molding is a method for producing and molding industrial products, and thermoplastic material flow is molded into a required shape by using different molding dies through an injection molding machine.

When the existing injection molding equipment is used for producing hollow pipes, the quality levels of the products are uneven, and the defects of uneven density distribution of the pipes, unsmooth pipe wall surfaces and the like exist.

Through retrieval, the Chinese patent publication number: CN 110696320A; the publication date is as follows: year 2020, month 01, day 17; the utility model discloses a PVC pipe fitting injection molding machine, the on-line screen storage device comprises a base, install drive arrangement on the base, the base top is equipped with feed arrangement, install the controller on the base, the base top is installed and is moulded plastics a heating device, the inside heating screw device that is equipped with of a heating device that extrudes of moulding plastics. Although the injection molding machine of the application improves the production efficiency, the compactness of material flow and the smoothness of the surface of a product in the injection molding production process cannot be guaranteed, and improvement is needed.

Disclosure of Invention

In order to solve at least one of the above technical problems, according to an aspect of the present invention, there is provided an injection molding apparatus for a hollow pipe, the apparatus including:

an injection molding machine that injection molds a material flow for the hollow pipe;

the cooling and shaping unit is arranged on one side of the product outlet of the injection molding machine and used for cooling and shaping the injection molding product;

the traction unit is arranged on one side of the cooling and shaping unit and is used for drawing the cooled and shaped injection molding product;

the cutting unit is arranged on one side of the traction unit and is used for cutting the injection molding product into a specified length;

be equipped with injection mold on the injection molding machine and be used for shaping cavity pipe fitting, injection mold includes:

the die sleeve is in a hollow cylindrical shape;

the taper angle hole section is arranged in the middle of one end face of the die sleeve along the central axis direction of the die sleeve, and the hole diameter is gradually reduced from one end face of the die sleeve to the other end face of the die sleeve;

the diameter bearing hole section is arranged in the middle of the other end face of the die sleeve along the central axis direction of the die sleeve, is a straight hole and is communicated with the cone angle hole section; also comprises the following steps of (1) preparing,

a mold core connected with the mold sleeve, and a part of the mold core is arranged in the hollow structure of the mold sleeve, the mold core comprises,

a tapered section disposed in the tapered bore section of the die case;

and one end of the core section is connected with the small-diameter end face of the conical section, and the other end of the core section penetrates through the diameter bearing hole section of the die sleeve and extends out of the die sleeve.

According to the injection molding equipment for the hollow pipe fitting, optionally, the cutting unit is connected to the slide way in a sliding mode, the length direction of the slide way is parallel to the moving direction of the injection molding product, the cutting unit moves along the length direction of the slide way through the driving piece during cutting, and the moving speed is the same as the moving speed of the injection molding product.

According to the injection molding equipment for the hollow pipe fitting, provided by the embodiment of the invention, optionally, the distance D that the core section of the mold core extends out of the mold sleeve is D, and D is more than or equal to 1mm and less than or equal to 2 mm.

According to the injection molding equipment for the hollow pipe fitting, provided by the embodiment of the invention, optionally, the distance from the small-diameter end surface of the conical section of the mold core to the diameter bearing hole section is H, and H is more than or equal to 1.5mm and less than or equal to 2.5 mm.

According to the injection molding equipment for the hollow pipe fitting, provided by the embodiment of the invention, optionally, the length of the diameter bearing hole section of the die sleeve is L, and L is 1.5-2 times of the diameter bearing hole section.

According to the injection molding equipment for the hollow pipe fitting, disclosed by the embodiment of the invention, optionally, the outer cone angle of the mold core is alpha, the inner cone angle of the mold core is beta, and beta-alpha = 4-9 degrees.

According to the injection molding equipment for the hollow pipe fitting, provided by the embodiment of the invention, optionally, a thread groove is formed on the hole wall of the taper hole section of the die sleeve along the axial direction of the die sleeve.

According to the injection molding equipment of the hollow pipe fitting provided by the embodiment of the invention, optionally, the mold core further comprises:

the outer diameter of the limiting ring is the same as the outer diameter of the end face of the die sleeve, which is provided with the taper angle hole section, and the inner diameter of the limiting ring is the same as the diameter of the large-diameter end part of the taper angle hole section;

the connecting section is positioned in the middle of the limiting ring and is fixedly connected with the limiting ring through a plurality of connecting plates;

one end face of the connecting section is fixedly connected with the large-diameter end face of the conical section.

Advantageous effects

Compared with the prior art, the invention has at least the following beneficial effects:

(1) according to the injection molding equipment for the hollow pipe fitting, disclosed by the invention, the injection mold on the injection molding machine can be used for quickly molding the hollow pipe fitting with uniform density and smooth surface, and can accurately guide an injection molding product to enter the cooling and shaping unit for molding, the accumulation of the injection molding product is avoided through the traction unit, and finally the required length of the hollow pipe fitting is obtained through the cutting unit, so that the injection molding equipment has the characteristics of high production efficiency and high product quality;

(2) according to the injection molding equipment for the hollow pipe fitting, the cutting unit is connected with the slideway in a matched manner, and the cutting unit can be driven to move along the slideway when cutting is carried out, so that the cutting unit and an injection molding product keep a relatively static state, the normal movement of the injection molding product cannot be influenced when cutting is carried out, the product quality is ensured, and the equipment failure rate is reduced;

(3) according to the injection molding equipment for the hollow pipe fitting, the distance D between the core section and the die sleeve is controlled to be not less than 1mm and not more than 2mm, a certain guiding effect can be achieved on the molded hollow pipe fitting, and the condition that the hollow part is closed and deformed after the pipe fitting extends out can be effectively prevented;

(4) according to the injection molding equipment for the hollow pipe fitting, H is not less than 1.5mm and not more than 2.5mm from the small-diameter end surface of the conical section to the diameter bearing hole section, so that the production efficiency is improved, and the quality of the outer surface of the hollow pipe fitting is ensured;

(5) according to the injection molding equipment for the hollow pipe fitting, the length L of the diameter bearing hole section is 1.5-2 times of the diameter bearing hole section, so that the production efficiency, the surface uniformity of a product and the integral compactness of the product are ensured;

(6) according to the injection molding equipment for the hollow pipe fitting, the angle difference beta-alpha = 4-9 degrees is controlled, the pressure is ensured to enable the product to be compact and uniform, the resistance is not too large, and the production efficiency is ensured;

(7) according to the injection molding equipment for the hollow pipe fitting, the thread groove is arranged to guide material flow injected into the die sleeve and the die core, the material flow in the channel can be uniformly mixed, the material flow uniformly enters the channel in the circumferential direction when the material flow is in the channel at the diameter bearing hole section, and the uniformity of the product density is further ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.

FIG. 1 is a half sectional view of an injection mold of the present invention;

FIG. 2 is a half cross-sectional view of a mold core of the injection mold of the present invention;

FIG. 3 is a schematic view of a core end face of the injection mold of the present invention;

FIG. 4 is a half sectional view of a mold shell of the injection mold of the present invention;

FIG. 5 is a schematic view of an end face of a mold sleeve of the injection mold of the present invention;

FIG. 6 is a half sectional view of a die case according to example 7;

FIG. 7 is a schematic view of an injection molding apparatus for hollow tubing of the present invention;

reference numerals:

1. die sleeve; 10. a cone angle bore section; 11. a diameter bearing hole section; 12. a hollow tube outlet; 13. a thread groove;

2. a mold core; 20. a limiting ring; 21. a connecting section; 22. a tapered section; 23. a core segment; 24. a connecting plate;

1000. an injection molding machine; 100. injection molding a mold;

2000. a cooling and shaping unit;

3000. a traction unit;

4000. a cutting unit; 4001. a slideway.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

Example 1

The injection molding equipment of the hollow pipe fitting of this embodiment, the device includes:

an injection molding machine 1000 that injection molds a material flow for hollow pipe fittings;

a cooling and shaping unit 2000 which is provided at one side of the product outlet of the injection molding machine 1000, and cools and shapes the injection molded product;

a drawing unit 3000, which is provided at one side of the cooling and setting unit 2000, for drawing the cooling and setting injection molding product;

a cutting unit 4000 provided at one side of the drawing unit 3000 to cut the injection-molded product into a designated length;

be equipped with injection mold 100 on injection molding machine 1000 and be used for shaping cavity pipe fitting, injection mold 100 includes:

the die sleeve 1 is in a hollow columnar shape;

the taper angle hole section 10 is arranged in the middle of one end face of the die sleeve 1 along the central axis direction of the die sleeve 1, and the hole diameter is gradually reduced from one end face of the die sleeve 1 to the other end face;

the diameter bearing hole section 11 is arranged in the middle of the other end face of the die sleeve 1 along the central axis direction of the die sleeve 1, is a straight hole and is communicated with the taper angle hole section 10; also comprises the following steps of (1) preparing,

a mold core 2 which is connected with the mold sleeve 1 and is partially arranged in the hollow structure of the mold sleeve 1, the mold core 2 comprises,

a tapered section 22 disposed in the tapered bore section 10 of the die case 1;

and the core segment 23 has one end connected with the small-diameter end face of the conical segment 22 and the other end penetrating through the diameter bearing hole segment 11 of the die sleeve 1 and extending out of the die sleeve 1.

As shown in fig. 7, the injection molding machine 1000 is a main device for producing material flow to mold hollow pipe fittings, the hollow pipe fittings molded by the injection molding machine 1000 extend out and then enter the cooling and molding unit 2000, the injection molding products are completely molded in the cooling and molding unit 2000, the traction unit 3000 assists in pulling the molded injection molding products, the injection molding products which are not completely molded are prevented from being accumulated in the cooling and molding unit 2000 or just after leaving the injection molding machine 1000, so that the production and the product quality are not affected, and the cutting unit 4000 behind the traction unit 3000 cuts the injection molding products into required lengths according to the requirements; the injection molding machine 1000 is provided with an injection mold 100 for molding a desired shape of the hollow pipe.

As shown in fig. 1, the injection mold 100 of the present embodiment forms a channel for injecting plastic between the mold sleeve 1 and the mold core 2 by the cooperation of the mold sleeve 1 and the mold core 2, and the plastic flows through the channel and is then extruded from the hollow pipe outlet 12 of the mold sleeve 1, as shown in fig. 5, thereby obtaining a hollow pipe product, which is convenient and fast.

The mold sleeve 1 is arranged on the injection molding machine 1000, one part of the mold core 2 extends into the hollow part of the mold sleeve 1, and the other part is positioned outside the hollow part of the mold sleeve 1 and is fixedly connected with the mold sleeve 1 and the injection molding machine 1000; the bore bearing section 11 of the die sleeve 1 is flat and smooth in wall surface, and the surface of the core section 23 is also flat and smooth, which is beneficial to obtaining a hollow pipe product with a smooth surface.

Further, the hollow structure of the mold sleeve 1 of this embodiment includes a taper angle hole section 10 and a bore hole section 11, the portion of the mold core 2 extending into the hollow portion of the mold sleeve 1 includes a taper section 22 and a mold core section 23, after the mold core 2 is installed in cooperation with the mold sleeve 1, an annular long and narrow channel is formed between the taper angle hole section 10 and the taper section 22, the pressure of the material flow injected into the channel by the injection molding machine increases, the pressure of the material flow continuously increases along with the movement of the material flow toward the bore hole section 11, the density of the material flow is more uniform and compact, the material flow finally flows into the straight channel formed by the bore hole section 11 and the mold core section 23, the material flow in the channel is formed into a hollow pipe shape and finally is extruded from the outlet 12 of the hollow pipe, the mold core section 23 of this embodiment extends out of a portion of the mold sleeve 1, which facilitates guiding the hollow pipe extending out of the outlet 12 of the hollow pipe, so that the hollow pipe is smoothly guided into the cooling and the shaping unit 2000, further ensuring the product quality.

Example 2

The injection molding equipment for the hollow pipe fitting is further improved on the basis of embodiment 1, the cutting unit 4000 is connected to the sliding rail 4001 in a sliding mode, the length direction of the sliding rail 4001 is parallel to the moving direction of an injection molding product, during cutting, the cutting unit 4000 moves along the length direction of the sliding rail 4001 through a driving piece, and the moving speed is the same as the moving speed of the injection molding product.

Because the injection molding machine 1000 is in continuous production, the injection molding product continuously moves under the traction of the traction unit 3000, the cutting action of the cutting unit 4000 is perpendicular to the moving direction of the injection molding product, if the cutting unit 4000 directly performs the cutting action, the injection molding product cannot move in the time from the contact of the cutting unit 4000 with the injection molding product to the completion of the cutting, which inevitably affects the action of the traction unit 3000 and the output of the injection molding product, and affects the quality of an unmolded hollow pipe fitting and even causes the failure of injection molding equipment, for this reason, the improvement is made in the embodiment that the cutting unit 4000 is connected to the slideway 4001, the cutting unit 4000 is driven by a driving piece such as a motor to move, and when the cutting action is performed, the cutting unit 4000 is driven to synchronously move on the slideway 4001 along the moving direction of the injection molding product at the same speed as the injection molding product, and at this, the cutting does not influence the normal movement of the injection molding product, ensures the product quality and reduces the equipment failure rate.

Example 3

The injection molding equipment for the hollow pipe fitting is further improved on the basis of the embodiment 2, the distance that the core section 23 of the mold core 2 extends out of the mold sleeve 1 is D, and D is larger than or equal to 1mm and smaller than or equal to 2 mm.

As shown in figure 1, the core section 23 extends out of the die sleeve 1 by a proper length, can play a certain guiding role on the hollow pipe produced by molding, and can also effectively prevent the condition that the hollow part is closed and deformed after the pipe extends out, but the distance that the core section 23 extends out of the die sleeve 1 is D too long, which can lead to the shrinkage of the inner wall of the hollow pipe extruded during the molding process, thereby affecting the product quality, D too short can not play a due role, and through repeated test analysis, the result is obtained, when D is not less than 1mm and not more than 2mm, the effect is best.

Example 4

The injection molding equipment for the hollow pipe fitting is further improved on the basis of the embodiment 3, the distance between the small-diameter end surface of the conical section 22 of the mold core 2 and the diameter bearing hole section 11 is H, and H is more than or equal to 1.5mm and less than or equal to 2.5 mm.

As shown in fig. 1, the distance from the small-diameter end surface of the tapered section 22 to the diameter-bearing hole section 11 is H, the production efficiency of the hollow pipe fitting formed in the production process of the hollow pipe fitting is H, along with the increase of H, the pressure of the material flow to the core section 23 is increased, the flow resistance of the material flow is reduced, the production efficiency of the hollow pipe fitting is improved, but the too large H causes the uniformity and quality of the outer wall surface of the hollow pipe fitting extended out by forming to be deteriorated, along with the reduction of H, the resistance of the material flow is increased, the production efficiency is reduced, the too small H causes unsmooth discharging, the production progress is influenced, and to sum up, H is controlled to be 1.5mm or more and is 2.5mm or less in this embodiment, and the quality of the outer.

Example 5

The injection molding equipment of the hollow pipe fitting of this embodiment is further improved on the basis of embodiment 4, and the length of the diameter bearing hole section 11 of the die sleeve 1 is L, and L is 1.5-2 times of the diameter bearing hole section 11.

As shown in fig. 1, the length of the diameter bearing hole section 11 is designed for the size of the outer diameter of the hollow pipe fitting to be produced, the length of the diameter bearing hole section has great influence on the material flow pressure and the uniformity of the product, too long L can cause too large material flow pressure in the die sleeve 1, the production efficiency is low and the surface is not uniform, too short L can cause poor compactness of the whole product although the production efficiency is high, through research and analysis, the length L of the diameter bearing hole section 11 controlled by the embodiment is 1.5-2 times of the diameter bearing hole section 11, and the production efficiency, the surface uniformity of the product and the overall compactness of the product are ensured.

Example 6

The injection molding equipment for the hollow pipe fitting is further improved on the basis of the embodiment 5, the outer cone angle of the mold core 2 is alpha, the inner cone angle of the mold sleeve 1 is beta, and the beta-alpha = 4-9 degrees.

Fig. 2 and 4 show an outer taper angle α of the mold core 2 and an inner taper angle β of the mold sleeve 1, in this embodiment, the outer taper angle α of the mold core 2 is smaller than the inner taper angle β of the mold sleeve 1, the existence of the angle difference gradually shrinks the cross section of the channel formed by the mold core 2 of the mold sleeve 1, and the pressure applied to the material flow during flowing is gradually increased, so that the material flow in the channel is gradually densified and uniform, the smaller the angle difference is, the smaller the pressure is, the smaller the resistance is, the larger the angle difference is, the larger the pressure is, the resistance is, the angle difference β - α = 4-9 ° is controlled in this embodiment, it is ensured that the product is densified and uniform, the resistance is.

Example 7

The injection molding equipment for the hollow pipe fitting of the embodiment is further improved on the basis of the embodiment 6, and a thread groove 13 is formed on the hole wall of the taper hole section 10 of the die sleeve 1 along the axial direction of the die sleeve 1.

As shown in fig. 6, the arrangement of the thread groove 13 guides the material flow injected into the die sleeve 1 and the die core 2, and the material flow in the channel can be uniformly mixed, so that when the material flow is in the channel at the diameter bearing hole section 11, the material flow uniformly enters the channel in the circumferential direction, and the uniformity of the product density is further ensured.

Example 8

The injection molding equipment of the hollow pipe fitting of this embodiment is further improved on the basis of embodiment 7, and the mold core 2 further comprises:

the outer diameter of the limiting ring 20 is the same as the outer diameter of the end face, provided with the taper angle hole section 10, of the die sleeve 1, and the inner diameter of the limiting ring is the same as the diameter of the large-diameter end part of the taper angle hole section 10;

the connecting section 21 is positioned in the middle of the limiting ring 20 and is fixedly connected with the limiting ring 20 through a plurality of connecting plates 24;

one end face of the connecting section 21 is fixedly connected with the large-diameter end face of the conical section 22.

As shown in fig. 2 and 3, the limiting ring 20 can abut against the end of the mold sleeve 1, and cooperates with the injection molding machine 1000 to assist in fixing the relative rest position of the mold core 2 and the mold sleeve 1, the material flow of the injection molding machine 1000 is injected from the gap between the limiting ring 20 and the connecting section 21, the connecting plate 24 has a certain flow dividing effect on the material flow, and after the material flow enters the channel formed by the mold sleeve 1 and the mold core 2, the material flow is rapidly mixed and compacted uniformly under the action of the angle difference between the thread groove 13 and the conical section 22, and the conical angle hole section 10, and finally is formed and extended out through the channel at the diameter bearing hole section 11.

The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. An injection molding device for hollow pipe fittings comprises,

an injection molding machine that injection molds a material flow for the hollow pipe;

the cooling and shaping unit is arranged on one side of the product outlet of the injection molding machine and used for cooling and shaping the injection molding product;

the traction unit is arranged on one side of the cooling and shaping unit and is used for drawing the cooled and shaped injection molding product;

the cutting unit is arranged on one side of the traction unit and is used for cutting the injection molding product into a specified length;

its characterized in that is equipped with injection mold on the injection molding machine and is used for shaping cavity pipe fitting, and injection mold includes:

the die sleeve is in a hollow cylindrical shape;

the taper angle hole section is arranged in the middle of one end face of the die sleeve along the central axis direction of the die sleeve, and the hole diameter is gradually reduced from one end face of the die sleeve to the other end face of the die sleeve;

the diameter bearing hole section is arranged in the middle of the other end face of the die sleeve along the central axis direction of the die sleeve, is a straight hole and is communicated with the cone angle hole section; also comprises the following steps of (1) preparing,

a mold core connected with the mold sleeve, and a part of the mold core is arranged in the hollow structure of the mold sleeve, the mold core comprises,

a tapered section disposed in the tapered bore section of the die case;

and one end of the core section is connected with the small-diameter end face of the conical section, and the other end of the core section penetrates through the diameter bearing hole section of the die sleeve and extends out of the die sleeve.

2. An injection molding apparatus for hollow pipe members according to claim 1, wherein: cutting unit sliding connection is on the slide, slide length direction is on a parallel with injection moulding product moving direction and sets up, and during the cutting, cutting unit passes through the driving piece and removes along slide length direction, and the translation rate is the same with injection moulding product translation rate.

3. An injection molding apparatus for hollow pipe members according to claim 2, wherein: the distance that the core section of the mold core extends out of the mold sleeve is D, and D is more than or equal to 1mm and less than or equal to 2 mm.

4. An injection molding apparatus for hollow pipe members according to claim 3, wherein: the distance between the small-diameter end surface of the conical section of the mold core and the diameter bearing hole section is H, wherein H is more than or equal to 1.5mm and less than or equal to 2.5 mm.

5. An injection molding apparatus for hollow pipe members according to claim 4, wherein: the length of the diameter bearing hole section of the die sleeve is L, and L is 1.5-2 times of the diameter bearing hole section.

6. An injection molding apparatus for hollow pipe members according to claim 5, wherein: the outer cone angle of the mold core is alpha, the inner cone angle of the mold core is beta, and beta-alpha = 4-9 degrees.

7. An injection molding apparatus for hollow pipe members according to claim 6, wherein: and a thread groove is formed on the hole wall of the taper hole section of the die sleeve along the axial direction of the die sleeve.

8. An injection molding apparatus for hollow pipe elements as claimed in claim 7, wherein the mold core further comprises:

the outer diameter of the limiting ring is the same as the outer diameter of the end face of the die sleeve, which is provided with the taper angle hole section, and the inner diameter of the limiting ring is the same as the diameter of the large-diameter end part of the taper angle hole section;

the connecting section is positioned in the middle of the limiting ring and is fixedly connected with the limiting ring through a plurality of connecting plates;

one end face of the connecting section is fixedly connected with the large-diameter end face of the conical section.

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