Molding die for hot-meltable lining of metal elbow pipe body

Abstract

The utility model relates to the technical field of elbow pipeline corrosion prevention, and discloses a metal elbow pipe body hot melting lining forming die which is composed of a bent section, straight sections at the two ends of an elbow pipe body and flanges. The forming die comprises a bottom die cover, a bottom die, a core elbow die, a core outer sleeve, a top die and a top die cover which are matched with one another; the bending radius of the core elbow mold is matched with the bending radius of the bending section of the metal elbow pipe body; the inner diameter of the core outer sleeve is matched with the outer diameter of the core elbow die; the core outer sleeve is composed of an inner flexible polyurethane foam layer and an outer high-temperature-resistant layer. The two ends of the core elbow mold are detachably and fixedly connected with the bottom mold and the top mold respectively; the bottom mold cover and the top mold cover are detachably and fixedly connected with the flange respectively; a pouring gap is formed between the forming die and the inner wall of the metal elbow pipe body. According to the utility model, the problems that the polyurethane lining elbow is difficult to construct and the elbow with the straight section is difficult to demould can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of elbow pipeline anticorrosion, specifically, a kind of metal elbow pipe body hot melt inner lining forming die. BACKGROUND

[0002] Polyurethane lining elbow is an important pipeline connecting piece widely used in chemical industry, petroleum, water treatment, mining and other fields, and its design purpose is mainly to form a uniform and dense polyurethane anticorrosion wear-resistant lining layer inside steel or other rigid pipeline to improve the service life and stability of elbow under complex working conditions. This lining layer provides more excellent performance for traditional steel or other rigid pipelines, especially when transporting corrosive media or fluid containing particles, it can effectively prolong the service life of the pipeline and reduce the economic loss and downtime risk caused by frequent maintenance.

[0003] The reason why polyurethane material can become the ideal choice for elbow lining is due to its excellent physical and chemical properties. First, polyurethane has strong acid and alkali resistance, can resist the corrosion of various chemical media, and performs well in the environment with strong corrosion. Secondly, its excellent wear resistance can effectively reduce the damage to the inner wall caused by high-speed fluid scouring or wear. In addition, polyurethane also has good chemical stability and strong anti-aging ability, and can maintain stable performance for a long time even in high temperature, high pressure or complex chemical environment. Therefore, polyurethane lining elbow is increasingly widely used in industrial fields.

[0004] However, the elbow lining of steel or other rigid pipeline is usually prepared by first preparing the elbow of steel or other rigid pipeline, and then adding the lining layer. Since the elbow itself is a special-shaped component, its irregular shape makes it difficult for the mold to effectively enter the inner cavity of the elbow or to be demolded from the inner cavity of the elbow when adding polyurethane lining with the mold. This leads to technical difficulties such as damage to the inner wall of the elbow or the lining layer, difficulty in demolding, or difficulty in controlling the thickness and uniformity of the lining layer.

[0005] CN111497219A provides a processing method for steel pipe elbow lining, the feature is that the lining layer is added in the gap between the inner mold pipe and the steel pipe inner wall in the form of granules, then liquid is poured to extrude the inner mold pipe with hydraulic pressure to make the granules adhere to the steel pipe inner wall (additional adhesive is needed, the granules cannot be adhered); then the pouring liquid is released, and heat-resistant granules such as salt are filled in the inner cavity, and then heated after sealing, the heat conduction effect and the property of not being easy to melt of the salt are used to make the lining layer granules into liquid state, so as to adhere to the steel pipe inner wall. Then the filled heat-resistant granules are released. The disadvantage is that the granules will penetrate into the heat-conducting heat-resistant granules when they are heated and melted, so that the salt near the steel pipe inner wall cannot be removed, and the lining layer that penetrates into the heat-resistant granules will be lost, and the smoothness requirement of the pipe inner wall cannot be met.

[0006] At present, there is no ideal treatment method for this problem. Content of the utility model

[0007] For the above technology, the utility model provides a kind of metal elbow pipe body hot melt inner lining forming die, can improve the forming efficiency of metal elbow pipe body hot melt inner lining, and not damage metal elbow pipe body inner wall and hot melt inner lining layer.

[0008] Therefore, the specific technical scheme adopted by the utility model is as follows:

[0009] A kind of metal elbow pipe body hot melt inner lining forming die, the metal elbow pipe body is composed of curved section, straight section at the both ends of elbow pipe body and flange;The forming die includes mutually matched bottom mould cover, bottom mould, core elbow mould, core sleeve, top mould and top mould cover;The bending radius of the core elbow mould matches the bending radius of the curved section of the metal elbow pipe body;The inner diameter of the core sleeve matches the outer diameter of the core elbow mould;The core sleeve is composed of flexible polyurethane foam layer in inner layer and outer layer high temperature resistant layer;The both ends of the core elbow mould are respectively detachably fixedly connected with bottom mould and top mould;The bottom mould cover and top mould cover are respectively detachably fixedly connected with flange;The forming die and the inner wall of the metal elbow pipe body form pouring gap.

[0010] The term "detachable fixed connection" is a way of connecting by means of detachable fixed connection structure, such as threaded connection, pin connection, etc., which has the advantages of not damaging any part in the connection and being reusable.The term "pouring gap" is a gap for pouring liquid inner lining, i.e. the space formed after cooling to form inner lining layer.

[0011] The term "hot melt inner lining" refers to a kind of high molecular inner lining material that can be heated to become liquid, thus facilitating pouring, and becomes solid after cooling, which can be selected from any one of polyvinyl chloride (PVC), polyurethane (TPU) and polypropylene (PP).

[0012] The bottom mould cover and the bottom mould can be integrally formed structure. Since the bottom mould and the top mould match the straight section at the both ends of the metal elbow pipe body and are easy to demould, the material of the bottom mould and the top mould is not limited, which can be made of any one of steel, iron, ceramic and other heat-resistant materials.

[0013] Preferably, the hot melt inner lining is polyurethane inner lining.

[0014] Preferably, the metal elbow pipe body is any one of steel elbow pipe body, iron elbow pipe body and aluminum elbow pipe body.

[0015] Preferably, the core elbow mould is made of stainless steel material.

[0016] Preferably, the detachable fixed connection is a threaded connection.

[0017] Preferably, the bottom die and the top die are both hollow cylinders, the bottom die is flush with the bottom end of the metal elbow pipe body away from the one end of the core elbow die, and the top end of the top die is higher than the flange of the upper end of the metal elbow pipe body.

[0018] Preferably, the end faces of the two ends of the core elbow die are provided with concave-convex positioning structures matched with the bottom die and the top die.

[0019] Preferably, the concave-convex positioning structure connection is provided with a sealing gasket.

[0020] The beneficial effects of the utility model are as follows:

[0021] The core sleeve pipe of the utility model adopts a flexible skeleton of foamed polyurethane, a high-temperature-resistant thin layer is wound on the outer layer, and an oily release agent is applied, so that the inner lining layer can be smoothly taken out of the mold after solidification, especially in the elbow with a straight section, the demolding is more convenient; in addition, the sealing gasket is used at the connection between the bottom die, the top die and the core elbow die, so that the liquid polyurethane does not leak during pouring, and the installation and disassembly of the mold are facilitated, the problems of difficult processing of the polyurethane lining of the elbow and difficult demolding of the elbow with a straight section are solved, and technical support is provided for the wide application of the polyurethane lining elbow. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed in the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0023] Figure 1 is a structure schematic view of a metal elbow pipe body heat-meltable lining forming die according to an embodiment of the utility model;

[0024] Figure 2 is a top view of a metal elbow pipe body heat-meltable lining forming die according to an embodiment of the utility model;

[0025] Figure 3 is Figure 1 is an enlarged view of the local structure at A in Fig.

[0026] Figure 4It is a structure schematic diagram of a polyurethane inner lining elbow according to the embodiment of the utility model.

[0027] In the drawings:

[0028] 1, bottom die; 2, bottom die cover; 3, core elbow die; 4, top die; 5, top die cover; 6, core outer sleeve; 7, pouring gap; 8, pouring port; 9, positioning groove; 10, positioning boss; 11, sealing gasket; 12, fastening bolt; 13, metal elbow pipe body; 14, flange; 15, polyurethane inner lining layer. DETAILED DESCRIPTION

[0029] To further illustrate the embodiments, the utility model provides drawings, these drawings are part of the utility model disclosure, it is mainly used to illustrate the embodiment, and can cooperate with the relevant description of the specification to explain the operating principle of the embodiment, cooperate with reference to these contents, and the person skilled in the art should understand other possible implementation modes and the advantages of the utility model, the components in the drawings are not drawn according to scale, and similar component symbols are usually used to indicate similar components.

[0030] Example 1 polyurethane inner lining metal elbow pipe body is lined with forming die

[0031] This embodiment takes the metal (steel) elbow pipe body with polyurethane inner lining as an example to demonstrate the forming die. As a specific case, the metal (steel) elbow pipe body of this embodiment is a 90° arc elbow pipe, i.e. the straight sections at both ends of the elbow pipe body have an included angle of 90°.

[0032] As shown in Figures 1-4 , the embodiment provides a lining forming die for a metal (steel) elbow pipe body with polyurethane inner lining. As shown in Figure 4 , the metal elbow pipe body 13 is composed of a curved section, straight sections at both ends of the elbow pipe body and flanges 14 at both ends of the elbow pipe body, wherein the polyurethane inner lining layer 15 is located on the inner wall of the metal elbow pipe body 13 as an anti-abrasion and anti-corrosion lining layer.

[0033] The forming die of the embodiment is used for processing the polyurethane inner lining layer 15 on the inner wall of the metal elbow pipe body 13. The forming die comprises a bottom die 1, one end of the bottom die 1 is connected with the bottom end of the metal elbow pipe body through a bottom die cover 2, and the other end of the bottom die 1 is provided with a core elbow die 3 matched therewith. In specific application, the core elbow die in the embodiment can also be a hollow die with a certain hardness. In specific application, for elbows with a large caliber (DN200 or more), a hollow core elbow die is used to reduce the cost; for elbows with a small caliber (DN200 or less), a solid core elbow die is used; in addition, the thickness of the core elbow die is generally 6-10 mm in order to make the external flexible foamed polyurethane bend to the required bending radius and connect the bottom die cover and the top die; the core elbow die 3 away from the bottom die 1 is provided with a top die 4 matched therewith, and the outer side of the top die 4 is connected with the top end of the metal elbow pipe body through a top die cover 5; the outer side of the core elbow die 3 is sleeved with a core outer sleeve 6 matched therewith, the outer side of the core outer sleeve 6 is wound with a high-temperature-resistant layer, in specific application, the high-temperature-resistant layer in the embodiment is a high-temperature-resistant thermal insulation coating of RIGID, and the high-temperature-resistant layer can use a pure film iron fluorine dragon adhesive tape resistant to high temperature PTEE adhesive tape, when winding, only the surface of the foamed polyurethane is covered with the adhesive tape, in addition, since the installation of the die is before pouring, and there is a large gap between the die and the elbow pipe, therefore, the situation of extrusion leading to the falling off of the high-temperature-resistant adhesive tape will not occur, and the outer side of the high-temperature-resistant layer is coated with an oily release agent; the bottom die 1, the bottom die cover 2, the core outer sleeve 6 and the top die 4 and the inner wall of the metal elbow pipe body form a pouring gap 7, and the inner wall of the top die cover 5 and the outer wall of the top die 4 form a pouring opening 8 in communication with the pouring gap 7.

[0034] Specifically, the bottom die 1 and the top die 4 are both hollow cylinders, and the end of the bottom die 1 away from the core elbow die 3 is flush with the bottom end of the metal elbow pipe body, and the top end of the top die 4 extends upward above the metal elbow pipe body. The end of the bottom die 1 close to the core elbow die 3 and the end of the top die 4 close to the core elbow die 3 are both provided with a positioning groove 9. The core elbow die 3 and the core outer sleeve 6 are both arc-shaped structures (the core outer sleeve 6 is a flexible structure, Figure 1The arc-shaped structure shown in the middle is a structure supported by the core elbow mold 3 when entering the inner cavity of the metal elbow pipe body 13, and both ends of the core elbow mold 3 are provided with positioning bosses 10 matched with the positioning grooves 9; the connection between the positioning bosses 10 and the positioning grooves 9 is sealed and connected through a sealing gasket 11, and the outer side of the positioning groove 9 is provided with a groove matched with the sealing gasket 11. The bottom mold cover 2 and the top mold cover 5 are threadedly connected through the fastening bolts 12 between the two ends of the metal elbow pipe body, between the two ends of the core elbow mold 3 and the bottom mold 1 and the top mold 4, and between the top mold cover 5 and the top mold 4. In specific applications, since the core elbow mold is relatively thin, it is not convenient to align the threaded interface after being inserted, therefore, the bottom mold 1 and the top mold 4 in the embodiment are provided with matching concave-convex positioning structures with the core elbow mold 3, so as to facilitate threaded connection and fixation.

[0035] In the embodiment, the outer diameter of the bottom mold 1, the outer diameter of the top mold 4 and the outer diameter of the core outer sleeve pipe 6 after installation are the same, and the mold parameters can be flexibly set according to the thickness requirement of the polyurethane inner lining layer 15, so as to ensure the thickness uniformity of the polyurethane inner lining layer 15 and can be flexibly adjusted and customized. In the embodiment, the bending radius of the core elbow mold 3 is the same as the bending radius of the metal elbow pipe body, and the diameter of the core elbow mold 3 is smaller than the bending section of the metal elbow pipe body 13, so as to facilitate the supporting effect of the core elbow mold 3 on the core outer sleeve pipe 6, and facilitate demolding and insertion. In specific applications, when the core elbow mold 3 demolds along the bending radius and just hits the inner wall of the formed elbow, it is the limit position, that is, the maximum diameter of the core elbow mold 3 that can be selected, and the maximum diameter of the core elbow mold 3 can be calculated when confirming the core elbow mold 3, then a slightly smaller elbow pipe that can be purchased can be selected, and steel plates are sealed at both ends of the elbow pipe, threaded holes are opened on the steel plates for convenient positioning and installation, and finally the core elbow mold 3 can be obtained, so as to ensure that the core elbow mold 3 can be smoothly demolded after pouring and forming.

[0036] In addition, the above-mentioned mold in the embodiment can also be used for hot setting pouring of elbows, such as pouring of polyurethane elbows.

[0037] In the embodiment, the outer diameter of the bottom mold 1, the outer diameter of the top mold 4 and the outer diameter of the core outer sleeve pipe 6 after installation are the same, and the mold parameters can be flexibly set according to the thickness requirement of the polyurethane inner lining layer 15, so as to ensure the thickness uniformity of the polyurethane inner lining layer 15 and can be flexibly adjusted and customized. In the embodiment, the bending radius of the core elbow mold 3 is the same as the bending radius of the metal elbow pipe body, and the diameter of the core elbow mold 3 is smaller than the bending section of the metal elbow pipe body 13, so as to facilitate the supporting effect of the core elbow mold 3 on the core outer sleeve pipe 6, and facilitate demolding and insertion. In specific applications, when the core elbow mold 3 demolds along the bending radius and just hits the inner wall of the formed elbow, it is the limit position, that is, the maximum diameter of the core elbow mold 3 that can be selected, and the maximum diameter of the core elbow mold 3 can be calculated when confirming the core elbow mold 3, then a slightly smaller elbow pipe that can be purchased can be selected, and steel plates are sealed at both ends of the elbow pipe, threaded holes are opened on the steel plates for convenient positioning and installation, and finally the core elbow mold 3 can be obtained, so as to ensure that the core elbow mold 3 can be smoothly demolded after pouring and forming.

[0038] According to another embodiment of the utility model, as shown in Figure 4 A metal (steel) elbow pipe body with a polyurethane lining is provided, which is produced by using the lining forming mold in the embodiment 1. Both ends of the metal elbow pipe body 13 are provided with flanges 14, and the inner wall of the metal elbow pipe body 13 is provided with a polyurethane lining layer 15. In specific applications, the bending degree of the metal elbow pipe body 13 can be 45 degrees, 60 degrees and 90 degrees, etc.

[0039] In summary, by means of the technical scheme of the present application, the flexible skeleton of the foamed polyurethane is used for the core outer sleeve, the high-temperature-resistant thin layer is wound on the outer layer, and the oily release agent is applied, so that the inner lining can be smoothly taken out from the mold after curing, especially in the elbow with a straight section, the demolding is more convenient; in addition, the sealing gasket is used at the connection between the bottom mold and the top mold and the core elbow mold, so that the liquid polyurethane does not leak during pouring, and the installation and removal of the mold are facilitated, the problems of difficult construction of the polyurethane inner lining elbow and difficult demolding of the elbow with a straight section are successfully solved, and technical support is provided for the wide application of the polyurethane inner lining elbow.

[0040] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screw connecting" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication between two elements or the interaction relationship between two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning in the specific circumstances by the ordinary skilled in the art.

[0041] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heat-melt lining forming mold for a metal elbow pipe body, the metal elbow pipe body comprising a bent section, straight sections at both ends of the elbow pipe body, and flanges, characterized in that, The molding die includes a matching bottom mold cover (2), a bottom mold (1), a core elbow mold (3), a core outer tube (6), a top mold (4), and a top mold cover (5). The bending radius of the core elbow mold (3) matches the bending radius of the bending section of the metal elbow pipe body; the inner diameter of the core outer sleeve (6) matches the outer diameter of the core elbow mold (3); the core outer sleeve (6) is composed of an inner flexible polyurethane foam layer and an outer high-temperature resistant layer; the two ends of the core elbow mold (3) are detachably and fixedly connected to the bottom mold (1) and the top mold (4) respectively; the bottom mold cover (2) and the top mold cover (5) are detachably and fixedly connected to the flange respectively; the forming mold and the inner wall of the metal elbow pipe body form a casting gap (7).

2. The metal elbow pipe body heat-meltable inner lining forming mold according to claim 1, characterized in that, The heat-fusible lining is a polyurethane lining.

3. The metal elbow pipe body heat-meltable inner lining forming mold according to claim 1, characterized in that, The metal elbow body can be any one of steel elbow body, iron elbow body, or aluminum elbow body.

4. The metal elbow pipe body heat-meltable inner lining forming mold according to claim 1, characterized in that, The core bend mold (3) is made of stainless steel.

5. The metal elbow pipe body heat-meltable inner lining forming mold according to claim 1, characterized in that, The detachable fixed connection is a threaded connection.

6. The metal elbow pipe body heat-meltable inner lining forming mold according to claim 1, characterized in that, Both the bottom mold (1) and the top mold (4) are hollow cylinders. The end of the bottom mold (1) away from the core elbow mold (3) is flush with the bottom end of the metal elbow pipe body. The top end of the top mold (4) is higher than the flange at the upper end of the metal elbow pipe body.

7. The metal elbow pipe body heat-meltable inner lining forming mold according to claim 1, characterized in that, The end faces of the core bend mold (3) and the bottom mold (1) and top mold (4) are provided with matching concave and convex positioning structures.

8. A metal elbow pipe body heat-meltable inner lining forming mold according to any one of claims 1-7, characterized in that, A sealing gasket (11) is provided at the connection of the concave-convex positioning structure.

9. A hot-melt liner forming mold for a metal elbow pipe body according to claim 7, characterized in that, The end faces of the core bend mold (3) and the bottom mold (1) and top mold (4) are provided with matching positioning bosses (10) and positioning grooves (9).

10. A hot-melt liner forming mold for a metal elbow pipe body according to claim 7, characterized in that, The end faces of the core bend mold (3) are provided with positioning bosses (10), and the end faces of the bottom mold (1) and top mold (4) near the core bend mold (3) are provided with positioning grooves (9).

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