An injection molding device for the production of fluid pipelines

Abstract

The present invention provides an injection molding device for fluid pipeline production, which includes an injection molding unit, a sealing component, a feeding unit and a control unit. The injection molding unit includes a frame, an inner mold and an outer mold. The outer mold is arranged at one end of the frame. The inner mold is slidably arranged on the frame along the extension direction of the pipeline to be processed. The outer mold and the inner mold are coaxially arranged. The inner diameter of the outer mold is equal to the outer diameter of the pipeline to be processed, and the outer diameter of the inner mold is equal to the inner diameter of the pipeline to be processed. The pipeline to be processed is sleeved between the outer mold and the inner mold. The sealing component is used to fasten the outer mold on the outer peripheral wall of the pipeline to be processed. A pouring port is arranged on the inner mold. The feeding unit injects plastic into the pipeline to be processed through the pouring port. The control unit controls the movement of the inner mold.

Description

Technical Field

[0001] The present invention relates to the technical field of pipelines, and in particular to an injection molding device for producing fluid pipelines. Background Art

[0002] During the production of fluid pipelines, socket joints are injection-molded at the ends of the pipelines. By injection-molding socket joints with different diameters and lengths at the ends of different pipelines, the connection of the pipelines can be completed by connecting the large and small socket joints. For example, the Chinese patent document with the authorization publication number CN104329528B discloses a plastic pipeline connector and its production device. This device uses the method of clamping the upper mold and the lower mold during injection molding to inject joints on the inner pipe and the outer pipe. However, multi-mold clamping will inevitably produce a clamping line. A clamping line means that excessive plastic flows out at the mold joint or material flows into the gap between the plastic mold parts, resulting in flash on the plastic part. Since the connection of the pipelines is to insert the small socket joint of the pipeline into the large socket joint, and the clamping line will be generated on the socket joint that needs to ensure a certain sealing performance, the clamping line generated during the processing of the small socket joint will affect the insertion effect and sealing performance between the pipelines.

[0003] The information disclosed in the background art part of this application is only intended to deepen the understanding of the general background art of this application, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0004] According to the deficiencies of the prior art, an injection molding device for producing fluid pipelines is provided. This injection molding device for producing fluid pipelines can avoid the generation of clamping lines in the sealing working section of the socket joints of the pipelines, and reduce the inconvenience caused by the clamping lines during the insertion of the pipelines and the influence on the insertion sealing performance.

[0005] The above object is achieved by the following technical solutions:

[0006] An injection molding device for producing fluid pipelines, including an injection molding unit. The injection molding unit includes a frame, an outer mold, and an inner mold. The outer mold is arranged at one end of the frame. The inner mold is slidably arranged on the frame and slidably arranged relative to the outer mold along the axis direction of the outer mold. The inner diameter of the outer mold is equal to the outer diameter of the pipeline to be processed, and the outer diameter of the inner mold is equal to the inner diameter of the pipeline to be processed. The pipeline to be processed is sleeved between the outer mold and the inner mold, and the cavity surrounded by the outer mold and the inner mold is the feeding cavity;

[0007] A sealing component, which is used to clamp one end of the feeding cavity;

[0008] A feeding unit, which is used to inject materials into the feeding cavity;

[0009] A control unit, which controls the movement of the inner mold;

[0010] The inner mold and the outer mold seal the inner circumference of the pipeline to be processed, and the mold closing direction and the mold opening direction are the axial direction of the pipeline to be processed.

[0011] Optionally, a plurality of elastic flaps are evenly distributed in the circumferential direction at one end of the outer mold away from the inner mold. The original state of the plurality of elastic flaps is to expand outwards. The sealing assembly can clamp the plurality of elastic flaps to make them gather inwards and clamp one end of the feeding cavity.

[0012] Optionally, the sealing assembly includes a base, at least two rocker arms and at least two clamping clips. The base is slidably arranged on the frame in the vertical direction. The middle of the rocker arm is hinged to the frame. One end of the rocker arm is slidably connected to both ends of the base respectively. The clamping clips are respectively hinged to the other ends of the rocker arms connected to the base. The rocker arms and the clamping clips are in one-to-one correspondence. The clamping clip is a semi-circular ring and is adapted to the outer mold.

[0013] Optionally, a retaining ring is arranged on the outer mold. The retaining ring is arranged at one end of the outer mold close to the inner mold. The outer diameter of the retaining ring is the same as the outer diameter of the outer mold, and the inner diameter is the same as the outer diameter of the inner mold.

[0014] Optionally, the injection molding device for producing fluid pipelines further includes a support assembly and an airbag. The support assembly includes an air pump and a support ring frame. The support ring frame is hollow and is slidably arranged on the frame along the axial direction of the outer mold. An airbag is arranged at one end of the support ring frame close to the outer mold, and the other end is connected to the working end of the air pump.

[0015] Vent holes are arranged on the circumferential surface of the support ring frame corresponding to the airbag, and the middle of the support ring frame is communicated with the airbag.

[0016] Optionally, the injection molding device for producing fluid pipelines further includes a pipeline conveying unit. The pipeline conveying unit includes a base, a sliding frame and a plurality of rollers. The sliding frame is slidably arranged on the base, and the plurality of rollers are arranged on the sliding frame.

[0017] Optionally, the control unit includes a plurality of hydraulic rods, and the plurality of hydraulic rods are connected to the inner mold.

[0018] Optionally, the injection molding device for producing fluid pipelines further includes a numerical control system for controlling the movement of the plurality of hydraulic rods.

[0019] Optionally, an inverted mold slope is arranged at one end of the inner mold close to the outer mold.

[0020] Optionally, the feeding unit includes a barrel, a screw, a nozzle and a hopper.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention is provided with an outer mold and an inner mold. The inner mold can move closer to or away from the outer mold along the extending direction of the pipeline. The pipeline to be processed is sleeved between the outer mold and the inner mold for injection molding, and a sealed feeding cavity can be formed. The molten material is injected into the feeding cavity for injection molding. The inner mold and the outer mold seal the inner circumference of the pipeline to be processed, and the mold closing direction and the mold opening direction are the axial direction of the pipeline to be processed, avoiding the mold joint line at the joint of multiple molds, being able to prevent the mold joint line from appearing at the socket joint where the sealing performance needs to be guaranteed, and reducing the influence of the mold joint line on the sealing performance of the socket joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an injection molding device for producing a fluid pipeline according to the present invention;

[0024] Figure 2 is Figure 1 an exploded view of the pipeline and the injection molding unit in

[0025] Figure 3 is a front view of an injection molding device for producing a fluid pipeline according to the present invention;

[0026] Figure 4 is Figure 3 a cross-sectional view at A-A in

[0027] Figure 5 is Figure 4 an enlarged view at a in

[0028] Figure 6 is a front view of an injection molding device for producing a fluid pipeline according to the present invention (in the state of being clamped by the clamp, the frame is omitted);

[0029] Figure 7 is Figure 6 a cross-sectional view at B-B in

[0030] Figure 8 is Figure 7 an enlarged view at b in

[0031] Figure 9 is Figure 7 an enlarged view at b in

[0032] Among them:

[0033] 100, injection molding unit; 110, outer mold; 120, inner mold; 130, frame; 140, feeding cavity; 111, elastic flap; 112, retaining ring; 121, injection port

[0034] 200. Sealing assembly; 210. Base; 220. Rocker; 230. Clamp; 240. Hydraulic push rod;

[0035] 300. Feeding unit;

[0036] 400. Control unit;

[0037] 500. Support assembly; 510. Air pump; 520. Support ring frame; 530. Airbag;

[0038] 600. Pipeline conveying unit; 610. Base; 620. Sliding frame; 630. Roller;

[0039] 1000. Pipeline to be processed. Detailed implementation manners

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The serial numbers assigned to the components in this article, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0042] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0043] As Figures 1 to 9As shown, an injection molding device for producing a fluid pipeline of the present invention comprises an injection molding unit 100, a sealing assembly 200, a feeding unit 300 and a control unit 400, and is used for injection molding production of a pipe socket. The injection molding unit 100 comprises a frame 130, an inner mold 120 and an outer mold 110, the extension direction of the frame 130 is a horizontal direction, the axis direction of the pipe 1000 to be processed is also a horizontal direction, and the pipe 1000 to be processed moves along its own axis direction for processing.

[0044] An outer mold 110 is provided at one end of the frame 130, and a movable mold seat is slidably provided on the frame 130 along the axial direction of the outer mold 110. The inner mold 120 is provided on a side of the movable mold seat close to the outer mold 110, and the inner mold 120 is slidably provided on the frame 130 along the axial direction of the outer mold 110; the outer mold 110 and the pipe 1000 to be processed are arranged coaxially, and the outer mold 110 and the inner mold 120 are arranged coaxially, the inner diameter of the outer mold 110 is equal to the outer diameter of the pipe 1000 to be processed, and the outer diameter of the inner mold 120 is equal to the inner diameter of the pipe 1000 to be processed, and the pipe 1000 to be processed is sleeved between the outer mold 110 and the inner mold 120, and the cavity surrounded by the outer mold 110, the pipe 1000 to be processed, the inner mold 120 and the movable mold seat is the feed cavity 140, refer to Figure 5 , the material is injected into the feed cavity 140, and the bell-and-socket of the pipe 1000 to be processed is injection molded, and the shape of the feed cavity 140 is the shape of the newly processed bell-and-socket. The present invention adopts an injection molding method in which the pipe 1000 to be processed is set between the outer mold 110 and the inner mold 120, so as to avoid processing a parting line at the bell-and-socket, and reduce the influence of the parting line on the sealing performance of the bell-and-socket.

[0045] The sealing assembly 200 has a loose state and a clamped state. In the loose state, the pipe 1000 to be processed can slide relatively between the outer mold 110 and the inner mold 120. In the clamped state, the outer mold 110 can be clamped to the outer peripheral wall of the pipe 1000 to be processed, fix the outer mold 110 and the pipe 1000 to be processed and seal the gap between the outer mold 110 and the pipe 1000 to be processed to prevent the injected material from leaking out; the inner mold 120 is provided with a nozzle 121 connected to the feed cavity 140, and the material of the feed unit 300 is injected into the feed cavity 140 through the nozzle 121 for injection molding; the control unit 400 includes a plurality of hydraulic rods and a numerical control system, and the hydraulic rods are connected to the movable mold base to control the movement and stop of the inner mold 120.

[0046] It should be supplemented that an end of the inner mold 120 close to the outer mold 110 is provided with a reverse mold slope to facilitate demoulding of the workpiece after injection molding.

[0047] It should also be added that the feeding unit 300 includes a barrel, a screw, a nozzle and a hopper. When the screw rotates in the barrel, the material falling into the hopper is drawn into the barrel, and is gradually pushed forward and ejected through the nozzle.

[0048] When processing the socket and spigot of a fluid pipeline, the initial state of the sealing assembly 200 is the loosened state. The moving die base is in contact with the outer die 110, and the hydraulic rod presses the moving die base against the outer die 110. The inner die 120 is located in the middle of the outer die 110. Move the pipeline 1000 to be processed so that it moves along its own axis direction close to the outer die 110 until it is sleeved between the outer die 110 and the inner die 120. After the pipeline 1000 to be processed stops moving at the expected injection position, the feeding cavity 140 is formed at this time. The sealing assembly 200 changes from the loosened state to the clamped state. Control the feeding unit 300 to inject the molten material into the feeding cavity 140 through the injection port 121. After the feeding cavity 140 is filled with the molten material and undergoes pressure holding and cooling, the newly processed socket and spigot of the pipeline are processed and can be demolded. Move the inner die 120 away from the outer die 110 to separate the inner die 120 from the processed pipeline, and change the sealing assembly 200 from the clamped state to the loosened state, then the processed pipeline can be taken out, and the injection molding of the socket and spigot of the pipeline is completed.

[0049] In a further embodiment, a plurality of elastic flaps 111 are circumferentially and uniformly arranged at one end of the outer die 110 away from the inner die 120. The elastic flaps 111 are elastic, and the original state of the plurality of elastic flaps 111 is to expand outwards. The purpose is to make it easier for the port of the pipeline 1000 to be processed to enter the outer die 110 and reduce the error influence of the pipeline aligning with the outer die 110. The sealing assembly 200 can clamp the plurality of elastic flaps 111 to make them gather inwards and clamp one end of the feeding cavity 140.

[0050] In a further embodiment, the sealing assembly 200 includes a base 210, at least two rocker arms 220, at least two clamps 230, and a hydraulic push rod 240. The base 210 is arranged on the frame 130. The hydraulic push rod 240 can push the base 210 to make a sliding motion in the vertical direction. The middle of the rocker arm 220 is hinged to the frame 130. One end of the rocker arm 220 is slidably connected to both ends of the base 210 respectively. The clamps 230 are respectively hinged to the other end of the connection end of the rocker arm 220 and the base 210. The rocker arms 220 and the clamps 230 are in one-to-one correspondence. The clamp 230 is a semi-circular ring, and the diameter of the circular ring of the clamp 230 is equal to the diameter of the outer die 110. The two clamps 230 are arranged with their openings facing each other and are sleeved outside the outer die 110. The clamp 230 is adapted to the outer die 110.

[0051] The hydraulic push rod 240 can make the base 210 move in the vertical direction. The base 210 drives the rocker arm 220 to slide and rotate, so that the two clamps 230 clamp or loosen the outer die 110. When the pipeline 1000 to be processed is not at the expected injection position sleeved between the outer die 110 and the inner die 120, the clamp 230 loosens the outer die 110. Refer to Figure 3, enabling the pipeline 1000 to be processed to enter. When the pipeline 1000 to be processed is in the expected injection position, the hydraulic push rod 240 lifts the base 210, causing the rocker 220 to rotate clockwise. The two clamps 230 move closer to each other and clamp the outer mold 110, sealing the feeding cavity 140 circumferentially. Refer to Figure 6 .

[0052] In a further embodiment, refer to Figure 5 , a retaining ring 112 is provided on the outer mold 110. The retaining ring 112 is provided at one end of the outer mold 110 close to the inner mold 120. The outer diameter of the retaining ring 112 is the same as that of the outer mold 110, and the inner diameter is the same as that of the inner mold 120. Then, the outer mold 110, the inner mold 120, and the pipeline 1000 to be processed enclose to form a feeding cavity 140. When performing injection molding processing on the socket of a fluid pipeline, the pipeline 1000 to be processed is sleeved between the outer mold 110 and the inner mold 120. The feeding unit 300 feeds and injects from the injection port 121. The material fills the feeding cavity 140 and adheres to the pipeline 1000 to be processed. After the injection molding is completed and cooled, the inner mold 120 moves away from the outer mold 110 for demolding. At this time, the retaining ring 112 resists the port of the processed socket, giving the socket a supporting force in the direction from the inner mold 120 to the outer mold 110, so that the joint between the newly processed socket and the original pipeline will not be damaged by the frictional force of the inner mold 120 disengaging, ensuring the connection quality between the newly processed socket and the original pipeline.

[0053] In a further embodiment, the injection molding device for producing fluid pipelines of the present invention further includes a support assembly 500. The support assembly 500 includes an air pump 510 and a support ring frame 520. The support ring frame 520 is hollow and is slidably arranged on the frame 130 along the extending direction of the pipeline 1000 to be processed. An annular airbag 530 is provided at one end of the support ring frame 520 close to the outer mold 110. Vent holes are provided on the circumferential surface corresponding to this end and the airbag 530. The airbag 530 can expand. The other end of the support ring frame 520 is connected to the working end of the air pump 510. When the air pump 510 works, it inflates into the support ring frame 520 or sucks air from the support ring frame 520. When inflating, the gas passes through the vent holes into the airbag 530, causing the airbag 530 to expand and contact and support the inner wall of the pipeline 1000 to be processed, reducing the deformation of the pipeline. When sucking air, the airbag 530 contracts to its initial state. And during demolding, the airbag 530, the pipeline, and the inner mold 120 form a sealed space. When the inner mold 120 moves away from the outer mold 110, the volume of this sealed space increases due to the separation of the inner mold 120, causing the air pressure in the sealed space to decrease, attracting the wall of the pipeline to be demolded to deform inward, creating a gap between the outer wall of the pipeline and the outer mold 110, making demolding easier.

[0054] In a further embodiment, the injection molding device for fluid pipeline production of the present invention further includes a pipeline conveying unit 600. The pipeline conveying unit 600 includes a base 610, a sliding frame 620, and a plurality of rollers 630. The sliding frame 620 is slidably arranged on the base 610, and the plurality of rollers 630 are arranged on the sliding frame 620 for supporting and moving the pipeline 1000 to be processed.

[0055] Combined with the above embodiments, the working principle and process of the present invention are as follows:

[0056] When processing the socket of the fluid pipeline, the initial state of the clamping jaws 230 is the loosened state. The moving die base presses against the outer mold 110, the inner mold 120 is located in the middle of the outer mold 110, the elastic petals 111 are in the original state, and the airbag 530 contracts.

[0057] Move the pipeline 1000 to be processed to move along its own axis direction close to the outer mold 110 until it is sleeved between the outer mold 110 and the inner mold 120, and stop moving the pipeline 1000 to be processed after it is located at the expected injection position. At this time, the feeding cavity 140 is formed. Refer to Figure 5 , control the hydraulic push rod 240 to lift. The hydraulic push rod 240 lifts the base 210, the rocker 220 rotates clockwise, and the two clamping jaws 230 move closer to clamp the outer mold 110. Control the support ring frame 520 to make the end where the airbag 530 is arranged extend into the middle of the pipeline 1000 to be processed through the inner mold 120. Turn on the air pump 510 to inflate the middle of the support ring frame 520, so that the airbag 530 inflates and abuts against the inner wall of the pipeline 1000 to be processed. Control the feeding unit 300 to approach the inner mold 120, and inject the molten material into the feeding cavity 140 through the injection port 121 to fill the feeding cavity 140 with the molten material. The material adheres to the pipeline 1000 to be processed. After maintaining pressure and cooling for a period of time, make the inner mold 120 move away from the outer mold 110, so that the inner mold 120 is separated from the processed pipeline. The retaining ring 112 resists the port of the processed socket, the inner mold 120 is taken out of the processed pipeline, make the air pump 510 suck air, then the airbag 530 contracts, control the hydraulic push rod 240 to descend to the initial position, then the clamping jaws 230 are loosened, and the processed pipeline can be taken out.

[0058] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered as the scope recorded in this specification.

[0059] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the appended claims.

Claims

1. An injection molding device for fluid pipeline production, characterized in that, Comprising: An injection molding unit, the injection molding unit including a frame, an outer mold, and an inner mold. The outer mold is disposed at one end of the frame. The inner mold is slidably disposed on the frame and slidably disposed relative to the outer mold along the axis direction of the outer mold. The inner diameter of the outer mold is equal to the outer diameter of the pipeline to be processed, and the outer diameter of the inner mold is equal to the inner diameter of the pipeline to be processed. The pipeline to be processed is sleeved between the outer mold and the inner mold, and the cavity formed by surrounding the outer mold and the inner mold is the feeding cavity. A retaining ring is provided on the outer mold, and the retaining ring is disposed at the end of the outer mold close to the inner mold. The outer diameter of the retaining ring is the same as the outer diameter of the outer mold, and the inner diameter is the same as the outer diameter of the inner mold. It further includes a support assembly and an airbag. The support assembly includes an air pump and a support ring frame. The support ring frame is hollow and slidably disposed on the frame along the axis direction of the outer mold. An airbag is provided at the end of the support ring frame close to the outer mold, and the other end is connected to the working end of the air pump. Vent holes are provided on the circumferential surface of the support ring frame corresponding to the airbag. The middle of the support ring frame is communicated with the airbag. When inflated, gas is introduced into the airbag through the vent holes to make the airbag expand, contact the inner wall of the pipeline to be processed and support the inner wall of the pipeline to be processed to reduce deformation. When inhaling, the airbag contracts to the initial state, and when demolding, the airbag, the pipeline, and the inner mold form a sealed space to facilitate demolding. A sealing assembly for clamping one end of the feeding cavity. The sealing assembly has a loosened state and a clamped state. In the loosened state, the pipeline to be processed can slide relatively between the outer mold and the inner mold. In the clamped state, it can clamp the outer mold to the outer peripheral wall of the pipeline to be processed, fix the outer mold and the pipeline to be processed, and seal the gap between the outer mold and the pipeline to be processed. The sealing assembly includes a base, at least two rocker arms, and at least two clamping clips. The base is slidably disposed on the frame in the vertical direction. The middle of the rocker arm is hinged to the frame. One end of the rocker arm is respectively slidably connected to both ends of the base. The clamping clips are respectively hinged to the other ends of the connection ends of the rocker arm and the base. The rocker arm and the clamping clip correspond one by one. The clamping clip is a semi-circular ring and is adapted to the outer mold. A feeding unit for injecting materials into the feeding cavity. A control unit for controlling the movement of the inner mold. The inner mold and the outer mold seal the inside of the pipeline to be processed circumferentially, and the mold closing direction and the mold opening direction are the axis direction of the pipeline to be processed.

2. The injection molding device for fluid pipeline production according to claim 1, characterized in that, A plurality of elastic flaps are evenly distributed circumferentially at the end of the outer mold away from the inner mold. The original state of the plurality of elastic flaps is to expand outwards. The sealing assembly can clamp the plurality of elastic flaps to make them gather inwards and clamp one end of the feeding cavity.

3. The injection molding device for fluid pipeline production according to claim 1, characterized in that, The injection molding device for producing fluid pipelines further includes a pipeline conveying unit. The pipeline conveying unit includes a base, a sliding frame, and a plurality of rollers. The sliding frame is slidably disposed on the base, and the plurality of rollers are disposed on the sliding frame.

4. The injection molding device for fluid pipeline production according to claim 1, characterized in that, The control unit includes a plurality of hydraulic rods, and the plurality of hydraulic rods are connected to the inner mold.

5. The injection molding device for fluid pipeline production according to claim 4, wherein, The injection molding device for producing fluid pipelines further includes a numerical control system for controlling the movement of the plurality of hydraulic rods.

6. The injection molding device for the production of fluid pipelines according to claim 1, characterized in that, The end of the inner mold close to the outer mold is provided with an inverted mold slope.

7. The injection molding device for fluid pipeline production according to claim 1, characterized in that, The feeding unit includes a barrel, a screw, a nozzle, and a hopper.

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