CN114193702B - Pipe fitting internal injection molding production method for pipeline connection - Google Patents
Pipe fitting internal injection molding production method for pipeline connection Download PDFInfo
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- CN114193702B CN114193702B CN202111519843.9A CN202111519843A CN114193702B CN 114193702 B CN114193702 B CN 114193702B CN 202111519843 A CN202111519843 A CN 202111519843A CN 114193702 B CN114193702 B CN 114193702B
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- positioning sleeve
- expansion section
- pipe fitting
- positioning
- lubricating film
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 86
- 230000001050 lubricating effect Effects 0.000 claims abstract description 78
- 230000001681 protective effect Effects 0.000 claims abstract description 74
- 238000005452 bending Methods 0.000 claims abstract description 62
- 238000002347 injection Methods 0.000 claims abstract description 35
- 239000007924 injection Substances 0.000 claims abstract description 35
- 239000011241 protective layer Substances 0.000 claims abstract description 25
- 230000000149 penetrating effect Effects 0.000 claims abstract description 16
- 238000011049 filling Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 238000005461 lubrication Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/83—Lubricating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides an injection molding production method in a pipe fitting for pipeline connection, which belongs to the technical field of pipe fitting protection and comprises the following steps: a lubricating film is connected between the first positioning sleeve and the second positioning sleeve. The first positioning sleeve and the second positioning sleeve sequentially penetrate through the pipe fitting and are positioned on two sides of the bending part of the pipe fitting, and an injection molding cavity is formed between the lubricating film and the inner wall of the bending part. Injecting a protective material into the injection cavity, penetrating an expansion section in the lubricating film, and uniformly filling the injection cavity with the protective material through the expansion section. After the protective material is solidified, the protective material and the lubricating film form a protective layer for protecting the inner wall of the pipe fitting, and the lubricating film is used for reducing friction force between the protective material and the conveying medium. And taking down the expansion section, the first positioning sleeve and the second positioning sleeve. The friction coefficient of the surface of the lubricating film in the pipe fitting internal injection molding production method for connecting the pipeline is low, and the problem of blockage at the bending part of the pipe fitting can be effectively avoided after the protective layer is formed with the protective material.
Description
Technical Field
The invention belongs to the technical field of pipe fitting protection, and particularly relates to an internal injection molding production method of a pipe fitting for pipeline connection.
Background
At present, some connecting pipelines are usually spheroidal graphite cast iron pipes, and protective materials such as epoxy resin and the like are sprayed on the inner side surfaces of the ball-milling cast iron pipes in practical application, so that the pipelines are protected through protective structures formed by the protective materials.
The pipe fitting is used for connecting two adjacent pipelines, but the pipe fitting is different from the pipeline, and the structure of the pipe fitting is complex, and a plurality of bending parts are arranged in the normal case, so that the flow direction of a pipeline conveying medium is changed through the bending parts. The pipeline can reach the effect of protection through protective material, but the pipe fitting is comparatively complicated owing to its own structure, and current unable to make the inoxidizing coating of thickness unanimity on the inner wall of the bight of pipe fitting.
Disclosure of Invention
The invention aims to provide an in-injection production method of a pipe fitting for pipeline connection, which aims to solve the problem that a protective layer with uniform thickness cannot be manufactured on the inner wall of a bending part of the pipe fitting.
In order to achieve the above purpose, the invention adopts the following technical scheme: the method for producing the pipe fitting for connecting the pipeline by injection molding comprises the following steps:
A lubricating film is connected between the first positioning sleeve and the second positioning sleeve;
the first positioning sleeve and the second positioning sleeve are sequentially arranged in the pipe in a penetrating manner and positioned at two sides of the bending part of the pipe, and an injection molding cavity is formed between the lubricating film and the inner wall of the bending part in a surrounding manner;
injecting a protective material into the injection molding cavity, penetrating an expansion section in the lubricating film, and uniformly filling the injection molding cavity with the protective material through the expansion section;
after the protective material is solidified, the protective material and the lubricating film form a protective layer for protecting the inner wall of the pipe fitting, and the lubricating film is used for reducing friction force between the protective material and a conveying medium;
and removing the expansion section, the first positioning sleeve and the second positioning sleeve.
In one possible implementation manner, a plurality of positioning columns are arranged along the periphery of the lubricating film at intervals, the positioning columns are identical in length, and the end parts of the positioning columns are abutted against the inner wall of the bending part so as to ensure the consistency of the thickness of the protective layer.
In one possible implementation manner, the injecting the protective material into the injection molding cavity, and penetrating the expansion section in the lubricating film includes:
injecting the protection material into the injection cavity through a liquid injection hole on the first positioning sleeve;
the expansion section penetrates into the lubricating film from the first positioning sleeve, and the expansion section is driven to move until the expansion section reaches the second positioning sleeve.
In one possible implementation, the moving the expansion section until the expansion section reaches the second positioning sleeve includes:
when the protective material is discharged from the injection molding cavity from the discharge hole on the second positioning sleeve, the expansion section is braked.
In one possible implementation, the inner side of the lubricating film is a lubricating surface for contacting a conveying medium, and the outer side of the lubricating film is a positioning surface for connecting with the protective material; the positioning surface has a coefficient of friction greater than the lubrication surface.
In one possible implementation manner, the threading the first positioning sleeve and the second positioning sleeve in the pipe sequentially and positioning the first positioning sleeve and the second positioning sleeve on two sides of the bending portion of the pipe includes:
The first positioning sleeve and the second positioning sleeve are driven to slide along the bending part, so that the first positioning sleeve and the second positioning sleeve are distributed on two sides of the bending part;
and adjusting the angles of the first positioning sleeve and the second positioning sleeve to enable the lubricating film to be distributed along the length direction of the bending part.
In one possible implementation, the first positioning sleeve and the second positioning sleeve are each sleeved with a positioning element for positioning on the curved portion.
In one possible implementation, the removing the expansion section, the first positioning sleeve, and the second positioning sleeve includes:
and the expansion section is pulled out, and the first positioning sleeve and the second positioning sleeve are separated from the protective layer through heating.
In one possible implementation, the step of curing the protective material includes:
And heating the bending part.
In one possible implementation, the expansion section includes a plurality of connection joints connected in turn by ball joints, and is coated with lubricating oil.
The pipe fitting internal injection molding production method for pipeline connection provided by the invention has the beneficial effects that: compared with the prior art, the lubricating film is connected between the first positioning sleeve and the second positioning sleeve in the pipe fitting internal injection molding production method for connecting the pipeline, the first positioning sleeve and the second positioning sleeve are arranged in the pipe fitting in a penetrating way, and the first positioning sleeve and the second positioning sleeve are positioned at two ends of the bending part of the pipe fitting. The lubricating film is positioned on the inner side of the bending part, and an injection molding cavity is formed between the lubricating film and the inner wall of the bending part.
Injecting protection material into the injection molding cavity, penetrating the expansion section into the lubricating film after the injection of the protection material is completed, and extruding the injection molding cavity in the movement process of the expansion section so that the protection material moves in the injection molding cavity and uniformly fills the injection molding cavity. After the protective material is solidified, the protective material and the lubricating film form a uniform protective layer. And (5) taking down the expansion section, the first positioning sleeve and the second positioning sleeve to finish machining.
According to the application, the friction coefficient of the surface of the lubricating film is lower, the problem of blockage at the bending part can be effectively avoided after the lubricating film and the protective layer are formed, the preparation of the complex bending part protective layer can be completed through the first positioning sleeve, the second positioning sleeve and the expansion section, and the lubricating film has a simpler integral structure and is convenient for construction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an in-mold injection production method for a pipe fitting for pipeline connection according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, an in-mold injection method for producing a pipe for connecting a pipeline according to the present invention will now be described. The production method of the pipe fitting for the pipeline connection comprises the following steps:
a lubricating film is connected between the first positioning sleeve and the second positioning sleeve.
The first positioning sleeve and the second positioning sleeve sequentially penetrate through the pipe fitting and are positioned on two sides of the bending part of the pipe fitting, and an injection molding cavity is formed between the lubricating film and the inner wall of the bending part.
Injecting a protective material into the injection cavity, penetrating an expansion section in the lubricating film, and uniformly filling the injection cavity with the protective material through the expansion section.
After the protective material is solidified, the protective material and the lubricating film form a protective layer for protecting the inner wall of the pipe fitting, and the lubricating film is used for reducing friction force between the protective material and the conveying medium.
And taking down the expansion section, the first positioning sleeve and the second positioning sleeve.
The pipe fitting internal injection molding production method for pipeline connection provided by the invention has the beneficial effects that: compared with the prior art, the lubricating film is connected between the first positioning sleeve and the second positioning sleeve in the pipe fitting internal injection molding production method for connecting the pipeline, the first positioning sleeve and the second positioning sleeve are arranged in the pipe fitting in a penetrating way, and the first positioning sleeve and the second positioning sleeve are positioned at two ends of the bending part of the pipe fitting. The lubricating film is positioned on the inner side of the bending part, and an injection molding cavity is formed between the lubricating film and the inner wall of the bending part.
Injecting protection material into the injection molding cavity, penetrating the expansion section into the lubricating film after the injection of the protection material is completed, and extruding the injection molding cavity in the movement process of the expansion section so that the protection material moves in the injection molding cavity and uniformly fills the injection molding cavity. After the protective material is solidified, the protective material and the lubricating film form a uniform protective layer. And (5) taking down the expansion section, the first positioning sleeve and the second positioning sleeve to finish machining.
According to the application, the friction coefficient of the surface of the lubricating film is lower, the problem of blockage at the bending part can be effectively avoided after the lubricating film and the protective layer are formed, the preparation of the complex bending part protective layer can be completed through the first positioning sleeve, the second positioning sleeve and the expansion section, and the lubricating film has a simpler integral structure and is convenient for construction.
The pipe fitting is used as a component for connecting two pipelines, the structure of the pipe fitting is complex, a plurality of bending parts are arranged in the pipe fitting in general, the flow velocity of a medium in the pipe fitting can be reduced when the medium flows through the bending parts, and if the medium is poor in fluidity or contains more impurities, the medium is easy to block in the bending parts of the pipe fitting after being used for a period of time.
In order to improve the service life of a pipeline, the pipeline is prevented from being corroded due to reaction between the pipeline and a conveyed medium, and at present, a part of manufacturers can set a protective structure on the inner side surface of the pipeline, and the protective structure is usually made of a corrosion-resistant nonmetallic material. However, the moving direction of the medium can be changed when the medium flows in the pipe fitting with the bending part, so that the inner wall of the pipe fitting is flushed more strongly, and in order to avoid the problems of damage and the like caused by flushing of the pipe fitting, a part of manufacturers can set a protective layer on the inner wall of the pipe fitting at present, and the protective layer is similar to the protective structure in the pipe fitting.
Because the structure of pipe fitting itself is comparatively complicated, consequently it is difficult to set up the inoxidizing coating in the inside of pipe fitting, perhaps the thickness of inoxidizing coating that sets up can't guarantee inconsistent, if inoxidizing coating thickness is inconsistent can increase the resistance that the medium flowed. Since the inner side surface of the bent portion of the pipe is easily washed out to affect the service life, the above problems are mostly avoided by improving the structural strength of the pipe in the prior art, but this increases the production cost of the pipe in an intangible way.
In some embodiments of the method for producing the pipe fitting for pipeline connection by injection molding, a plurality of positioning columns are arranged at intervals along the periphery of the lubricating film, the lengths of the positioning columns are the same, and the end parts of the positioning columns are abutted against the inner wall of the bending part so as to ensure the consistency of the thickness of the protective layer.
In general, a protective material is injected into one side of an injection cavity, the lubricating sleeve deforms after the protective material is injected into the injection cavity, and the deformation of the lubricating sleeve is larger when the lubricating sleeve is closer to the side where the protective material is injected. In order to allow the protective material to uniformly fill the injection cavity, it is necessary to bend the expansion section through a large angle and to allow the expansion section to penetrate into the lubrication sleeve from the first positioning sleeve and ultimately move to the second positioning sleeve. During the movement of the expansion section, the protective material in the injection molding cavity is extruded by the expansion section so as to move in the injection molding cavity.
In order to ensure that the thickness of the protective layer is kept consistent, and avoid the problem that the thickness of the final protective layer is inconsistent due to the difference between the bending angle of the expansion section and the bending angle, the outer side surface of the lubricating sleeve, namely the side surface of the lubricating sleeve, which is close to the inner wall of the bending part, is provided with a plurality of positioning columns. After penetrating the expansion section in the lubricating sleeve, the lubricating sleeve is extruded to enable the positioning columns to be propped against the inner wall of the bending part finally, and the expansion section and the bending part are coaxially arranged under the cooperation of a plurality of positioning columns.
More importantly, the positioning columns and the protective material form an integrated structure after the protective material is solidified, and the relative stability between the lubricating film and the protective material is improved to a certain extent by arranging a plurality of positioning columns.
In some embodiments of the method for producing a pipe fitting for connecting a pipeline by injection molding, injecting a protective material into an injection cavity, and penetrating an expansion section into a lubricating film includes:
and injecting a protective material into the injection cavity through the liquid injection hole on the first positioning sleeve.
The expansion section penetrates into the lubricating film from the first positioning sleeve, and the expansion section is driven to move until the expansion section reaches the second positioning sleeve.
The expansion section moves from one side of the bending part to the other side, and the protective material is extruded in the movement process of the expansion section, so that the protective material fills the whole injection molding cavity. In order to ensure that the injection cavity is filled with the protection material, the protection material needs to be injected from the first positioning sleeve, and the protection material can be accumulated on one side of the injection cavity close to the first positioning sleeve after being injected into the liquid injection hole on the first positioning sleeve. At this time, after the expansion section enters the lubrication sleeve, the protection material is driven to move towards the second positioning sleeve, and when the expansion section moves to the second positioning sleeve, the injection cavity is filled with the protection material.
In some embodiments of the method for producing a pipe fitting for connecting a pipeline by injection molding, driving the expansion section to move until the expansion section reaches the second positioning sleeve includes:
when the protection material is discharged from the injection cavity from the discharge hole on the second positioning sleeve, the expansion section is braked.
When the discharge hole is discharged by the protective material, the injection cavity is proved to be filled with the protective material, and the expansion section stops moving until the protective material is cured. The first positioning sleeve is provided with a liquid injection hole, the protective material enters the injection cavity from the liquid injection hole and then flows in the injection cavity under the extrusion action of the expansion section, and finally the injection cavity is filled. After the injection cavity is filled with the protective material, the protective material is finally discharged from the discharge hole on the second positioning sleeve along with the continuous movement of the expansion section. When the injection molding cavity is in practical application, the injection molding cavity can be proved to be filled with the protective material when the protective material flows out from the discharge hole.
In some embodiments of the pipe fitting internal injection molding production method for pipeline connection provided by the application, the inner side surface of the lubricating film is a lubricating surface for contacting a conveying medium, and the outer side surface of the lubricating film is a positioning surface for connecting with a protective material; the positioning surface has a coefficient of friction greater than the lubrication surface.
Since the pipe is generally linear after the protective structure is provided in the pipe, the friction coefficient of the inner surface of the protective structure has little influence on the speed of the medium, but the flow direction of the medium itself changes when the medium flows in the curved portion. The friction coefficient of the inner wall of the pipe fitting can have a great influence on the flow speed of the medium in the process of turning the medium, and if particles in the medium are accumulated on the inner wall of the bending part, the pipe fitting is easy to be blocked.
In order to solve the above problems, the friction coefficient of the inner side surface of the lubrication sleeve needs to be reduced as much as possible, that is, even if the inner side surface of the lubrication sleeve is as smooth as possible, the friction force between the lubrication sleeve and the medium is reduced, so that the occurrence of the blockage problem is avoided. The outer side surface of the lubricating sleeve needs to be connected with the protective material and is of an integrated structure, so that the friction coefficient of the outer side surface of the lubricating sleeve needs to be large, a plurality of pits can be formed in the outer side surface of the lubricating sleeve, the protective material can flow into the pits, and the relative stability between the lubricating sleeve and the protective material is improved.
In some embodiments of the in-pipe injection production method for pipeline connection provided by the present application, sequentially inserting the first positioning sleeve and the second positioning sleeve into the pipe and positioning the first positioning sleeve at two sides of a bending portion of the pipe includes:
the first positioning sleeve and the second positioning sleeve are driven to slide along the bending part, so that the first positioning sleeve and the second positioning sleeve are distributed on two sides of the bending part.
And adjusting the angles of the first positioning sleeve and the second positioning sleeve to ensure that the lubricating film is distributed along the length direction of the bending part.
The first positioning sleeve and the second positioning sleeve need to be positioned at specific positions of the bending part, and the angles of the first positioning sleeve and the second positioning sleeve relative to the bending part need to be unchanged every time, so that the smooth spreading lugs of the lubricating sleeve after the expanding section passes through can be ensured not to be wrinkled.
Therefore, the traction rod can be detachably connected to the first positioning sleeve and the second positioning sleeve, the first positioning sleeve and the second positioning sleeve move along the axial direction of the bending part under the driving of the traction rod, and the problem that the first positioning sleeve and the second positioning sleeve are staggered relative to the bending part under the driving of the traction rod can be avoided by means of the structural strength of the traction rod.
In some embodiments of the method for producing a pipe fitting for connecting a pipeline by injection molding, the first positioning sleeve and the second positioning sleeve are sleeved with positioning pieces for positioning on the bending part.
The first positioning sleeve also needs to be filled with a protective material and used for passing through the expansion section, so the first positioning sleeve and the second positioning sleeve need to be stably positioned at specific positions of the bending part. Therefore, the positioning pieces can be sleeved outside the first positioning sleeve and the second positioning sleeve, the positioning pieces can be electromagnets, and after the first positioning sleeve and the second positioning sleeve move to the specific positions of the bending parts, the electromagnets are connected with a power supply, so that the positioning of the first positioning sleeve and the second positioning sleeve is completed.
In some embodiments of the present application, the method for producing a pipe for connecting a pipeline by injection molding in a pipe comprises:
and (3) extracting the expansion section, and heating to separate the first positioning sleeve and the second positioning sleeve from the protective layer.
The lubricating film can be a thermosetting material part, and the lubricating sleeve on the corresponding side is heated through the heating coils on the first positioning sleeve and the second positioning sleeve, so that the first positioning sleeve and the second positioning sleeve can be taken out conveniently. And a release agent can be smeared on the first positioning sleeve and the second positioning sleeve.
In some embodiments of the method for producing pipe fittings for pipeline connection provided by the application, after the protective material is solidified, the method comprises the following steps:
the bending portion is heated.
The protective material is typically polyethylene, polypropylene, and other materials that can be used for molding. In order to increase the curing speed of the protective material, after the expansion section is penetrated into the lubricating film, the temperature of the bent portion may be increased to accelerate the curing of the protective material.
In another embodiment, one end of the expansion section is connected with a traction rope, and the other end is connected with a connecting wire. The expansion section can be moved through the bending part by the traction rope, after the expansion section moves from the first positioning sleeve to the second positioning sleeve, the traction rope and the connecting wire are respectively connected with the anode and the cathode of the power supply, the temperature of the protective material is increased by the expansion section, and therefore the curing speed of the protective material is accelerated.
In some embodiments of the method for producing a pipe fitting for pipeline connection by injection molding, the expansion section comprises a plurality of connecting joints connected in turn by ball heads, and lubricating oil is coated on the expansion section. Because the structure of the bending part is complex, in order to enable the expansion section to smoothly penetrate into the bending part, the expansion section is formed by sequentially connecting a plurality of connecting joints, and one connecting joint can swing in a certain range relative to the adjacent connecting joint. The greater the number of connecting links in the expansion section, the smoother the entire expansion section after bending.
In order to ensure that two adjacent connecting joints can swing relatively, the two adjacent connecting joints are connected through a ball head. That is, a positioning ball is arranged on one connecting joint, and a limiting groove is arranged on the other adjacent connecting joint. The limiting groove is sleeved on the positioning ball, namely the positioning ball can swing in the limiting groove.
In practical application, the number of the connecting joints in the expansion section is as large as possible, and the structural shape of the connecting joints needs to be adjusted, so that the gap between two adjacent connecting joints is reduced as much as possible, and the lubricating sleeve is prevented from deforming at the two adjacent connecting joints.
The main purpose of the expansion section is to squeeze the protective material so that the protective material can fill the whole injection cavity, and the expansion section itself is required to be bent at a certain angle due to the complex inner cavity structure of the bending part of the pipe fitting. Therefore, the expansion section with corresponding specification can be manufactured according to the structural size of the bending part of the pipe fitting, and the manufacturing principle is that the outer side surface of the expansion section is ensured to be smooth after the expansion section is bent by corresponding angles, so that the bulges are reduced as much as possible. Because, once the expansion section is bent, corresponding pits are formed in the finally formed protective layer, which ultimately affect the thickness and service life of the entire protective layer.
In order to ensure that the expansion section can bend along a specific direction, the pipe fitting can be positioned in practical application, and then one end of the expansion section is connected with the traction rope, the traction rope itself needs to have certain torsion-resistant strength, the expansion section can be ensured not to rotate in the process of penetrating through the inner side of the lubricating sleeve by means of the traction rope, the lubricating film can be driven to move once the expansion section rotates, and the movement of the lubricating film can lead to the uneven side surface in the finally formed protective layer.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The method for producing the pipe fitting for the pipeline connection by internal injection molding is characterized by comprising the following steps:
A lubricating film is connected between the first positioning sleeve and the second positioning sleeve;
the first positioning sleeve and the second positioning sleeve are sequentially arranged in the pipe in a penetrating manner and positioned at two sides of the bending part of the pipe, and an injection molding cavity is formed between the lubricating film and the inner wall of the bending part in a surrounding manner;
injecting a protective material into the injection molding cavity, penetrating an expansion section in the lubricating film, and uniformly filling the injection molding cavity with the protective material through the expansion section;
after the protective material is solidified, the protective material and the lubricating film form a protective layer for protecting the inner wall of the pipe fitting, and the lubricating film is used for reducing friction force between the protective material and a conveying medium;
Removing the expansion section, the first positioning sleeve and the second positioning sleeve;
injecting protection material into the injection cavity, penetrating the expansion section in the lubricating film comprises:
injecting the protection material into the injection cavity through a liquid injection hole on the first positioning sleeve;
Penetrating the expansion section from the first locating sleeve into the lubricating film to drive the expansion section to move until the expansion section reaches the second locating sleeve;
The driving the expansion section to move until the expansion section reaches the second positioning sleeve comprises:
When the protective material is discharged from the injection cavity from a discharge hole on the second positioning sleeve, the expansion section is braked;
The inner side surface of the lubricating film is a lubricating surface for contacting a conveying medium, and the outer side surface of the lubricating film is a positioning surface for connecting with the protective material; the positioning surface has a coefficient of friction greater than the lubrication surface.
2. The method of in-mold production of pipe fittings for pipeline connection according to claim 1, wherein a plurality of positioning posts are provided at intervals along the outer periphery of the lubricating film, the positioning posts are the same in length and the ends of the positioning posts are abutted against the inner wall of the bent portion for ensuring the uniformity of the thickness of the protective layer.
3. The method of in-mold production of a pipe fitting for pipeline connection according to claim 1, wherein the sequentially threading the first positioning sleeve and the second positioning sleeve into the pipe fitting and positioning the first positioning sleeve on both sides of a bent portion of the pipe fitting comprises:
The first positioning sleeve and the second positioning sleeve are driven to slide along the bending part, so that the first positioning sleeve and the second positioning sleeve are distributed on two sides of the bending part;
and adjusting the angles of the first positioning sleeve and the second positioning sleeve to enable the lubricating film to be distributed along the length direction of the bending part.
4. The method of in-mold production of a pipe fitting for pipeline connection according to claim 1, wherein the first positioning sleeve and the second positioning sleeve are each provided with a positioning member for positioning on the bent portion.
5. The method of in-mold production of a pipe fitting for pipeline connection according to claim 1, wherein said removing said expansion section, said first positioning sleeve and said second positioning sleeve comprises:
and the expansion section is pulled out, and the first positioning sleeve and the second positioning sleeve are separated from the protective layer through heating.
6. The method of in-mold production of a pipe fitting for pipe connection according to claim 1, wherein after the protective material is cured, comprising:
And heating the bending part.
7. The method of in-mold production of a pipe fitting for pipeline connection according to claim 1, wherein the expansion section comprises a plurality of connection joints connected in turn by ball joints, and the expansion section is coated with lubricating oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111519843.9A CN114193702B (en) | 2021-12-13 | 2021-12-13 | Pipe fitting internal injection molding production method for pipeline connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111519843.9A CN114193702B (en) | 2021-12-13 | 2021-12-13 | Pipe fitting internal injection molding production method for pipeline connection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114193702A CN114193702A (en) | 2022-03-18 |
| CN114193702B true CN114193702B (en) | 2024-07-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101903115A (en) * | 2007-12-21 | 2010-12-01 | 乌尔可公司 | Method for lining a pipe or elbow |
| CN113700333A (en) * | 2021-09-01 | 2021-11-26 | 中国建筑第七工程局有限公司 | High-density reinforcing method for concrete integral structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10331731A (en) * | 1997-05-30 | 1998-12-15 | Tokai Rubber Ind Ltd | Manufacture of hose with sound absorbing material |
| DE202011100810U1 (en) * | 2011-05-13 | 2012-08-14 | Veritas Ag | pipe arrangement |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101903115A (en) * | 2007-12-21 | 2010-12-01 | 乌尔可公司 | Method for lining a pipe or elbow |
| CN113700333A (en) * | 2021-09-01 | 2021-11-26 | 中国建筑第七工程局有限公司 | High-density reinforcing method for concrete integral structure |
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