Casting system for carbon fiber reinforced semi-elbow pipe

Abstract

The present invention discloses a casting system for a carbon fiber reinforced half-bend pipe, belonging to the field of conveying bend pipes. The present invention includes a sand mold, which includes a plurality of half-bend pipe cavities that are parallel to each other and placed horizontally, and the openings of the half-bend pipe cavities are all downward; a half-bend pipe cavity is obtained after a cavity upper mold and a cavity lower mold are molded together, and the half-bend pipe cavity is used to cast the carbon fiber reinforced half-bend pipe; the carbon fiber reinforced half-bend pipe includes a half-bend pipe body, the half-bend pipe body is half of a bend pipe cut along the axial direction, and the half-bend pipe body is the half of the bend pipe on the side close to the bending direction, and the bending direction is the direction of the bend pipe from the inside to the outside; the half-bend pipe body is designed to thicken from the two ends A to the middle B and the two sides C to the middle D; a reinforcing protrusion is provided in the middle of the inner side of the half-bend pipe body, and a carbon fiber mesh layer is sandwiched in the reinforcing protrusion. The purpose of the present invention is to effectively compound carbon fiber materials onto existing metal bend pipes to increase the service life of the bend pipes.

Description

Technical Field

[0001] The invention relates to a conveying elbow pipe structure for industries such as construction, mining, metallurgy, electricity, petroleum, coal, and grain processing, and more specifically, to a casting system for a carbon fiber reinforced semi-elbow pipe. Background Art

[0002] The main forming technologies of elbows include casting and compression molding, which are all generated by pouring or hot and cold pressing processes through forming molds; no matter what kind of machinery and equipment and pipelines, most of them use elbows, which are mainly used to transport various materials; the materials of elbows include cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics; in the construction, mining, metallurgy, electricity, petroleum, coal, grain processing and other industries, the transportation of materials is through pipeline pressure transportation, and the conveying pipes are subject to greater pressure and severe wear. Therefore, there are higher comprehensive performance requirements for conveying pipes, especially connecting elbows, and improving the service life of elbows has become a difficult problem to overcome.

[0003] In the prior art, there are related technical solutions for wear-resistant and impact-resistant elbows, such as patent publication number: CN204717206 U, publication date: October 21, 2015, and the name of the invention is: an outer integral, inner two-part double-layer wear-resistant and impact-resistant elbow. The application discloses an outer integral, inner two-part double-layer wear-resistant and impact-resistant elbow, which is composed of an outer integral, inner two-part double-layer elbow, two wear-resistant connecting flanges, and flange welds; the outer integral, inner two-part double-layer wear-resistant and impact-resistant elbow is used in harsh environments in industries such as construction, mining, metallurgy, electricity, petroleum, coal, and grain processing. It is designed as a unique structure of an outer integral, inner two-part double layer, divided into a protective layer and a wear-resistant layer, with good wear resistance, long service life, high cost performance, easy to achieve mass production, stable and reliable quality, and high safety performance. However, the technical problem of the above application is that although the semi-bend pipe is protected by the wear-resistant layer, the wear resistance of the wear-resistant layer is limited by the existing steel, so that the service life of the semi-bend pipe cannot be further improved.

[0004] Carbon fiber materials themselves have outstanding advantages such as wear resistance, high strength, good rigidity and strong flexibility. Based on the above outstanding advantages of carbon fiber materials, the prior art proposes to compound carbon fiber materials into the manufacturing process of bent pipes. For example, patent publication number: CN 102514169 A, publication date: June 27, 2012, the invention is named: Silicone rubber extrusion hose with carbon fiber as reinforcement layer and its manufacturing process, the application includes the following steps: extruding an inner rubber layer on a mold core of required size; surface treating the carbon fiber cloth to increase the content of its surface polar groups; weaving or winding the surface treated carbon fiber cloth as a reinforcement layer on the inner rubber layer; extruding an outer rubber layer on the carbon fiber cloth and coating the surface of the carbon fiber cloth; after molding, vulcanizing the obtained hose to obtain a finished product, wherein the inner rubber layer and the outer rubber layer include silicone rubber. The application uses carbon fiber cloth as the reinforcement layer to manufacture silicone rubber cloth-wrapped hoses, which not only solves the problems of low strength and poor pressure resistance of existing silicone rubber hoses, but also improves the temperature resistance of silicone rubber hoses and maximizes the temperature and pressure resistance of silicone rubber. However, the disadvantage of the application is that the silicone rubber extrusion hose in the application is only suitable for composite carbon fiber wear-resistant materials on non-metallic bent pipes, and is not suitable for the manufacture of metal bent pipes.

[0005] Another example is the patent application number: CN 103256436 A, the publication date: August 21, 2013, the invention is named: a carbon fiber conveying pipeline for conveying concrete and its manufacturing method, the carbon fiber conveying pipeline in the application has a carbon fiber material content of 100% in its ingredients, the wall thickness of the standard straight pipe is more than 4mm, the wall thickness of the thickened straight pipe is more than 7mm; the thinnest part of the curved pipe wall is more than 7mm, and the thickest part is more than 14mm; the manufacturing method of the carbon fiber conveying pipeline in the application mainly includes the following steps: S1. oxidation treatment to obtain pre-oxidized carbon fiber filaments; S2. carbonization treatment, including two stages of medium temperature carbonization and high temperature carbonization, to obtain graphitized carbon fiber filaments; S3. weaving a net to obtain a block of carbon fiber cloth; S4. bonding and forming to obtain a carbon fiber pipeline product. The carbon fiber conveying pipeline made by the manufacturing method of the application has outstanding advantages such as light weight, long service life, small impact, and small pressure loss, and the diameter of the conveying pipeline can be increased, which is conducive to improving productivity. However, the shortcoming of this application is that the carbon fiber conveying pipeline in this application is completely made of carbon fiber materials, the production cost is too high, and it is difficult to promote and use widely.

[0006] For example, the patent application number is CN 202691407 U, the publication date is January 23, 2013, and the invention is named as a polymer-reinforced composite wear-resistant elbow. The wear-resistant elbow of the application includes a wear-resistant steel elbow body and a layer of glass fiber or carbon fiber reinforced polymer layer fastened and coated on the outer peripheral surface of the elbow body. The application overcomes the safety problem caused by the lack of toughness of a single elbow. However, the disadvantage of the application is that the carbon fiber reinforced polymer layer is coated on the outer peripheral surface of the elbow body in the application, which improves the toughness of the elbow, but cannot improve the wear resistance of the inside of the elbow.

[0007] In summary, how to effectively compound carbon fiber materials onto existing metal elbows to increase the service life of the elbows is a technical problem that urgently needs to be solved in the prior art. Summary of the invention

[0008] 1. Technical problem to be solved by the invention

[0009] The purpose of the present invention is to effectively compound carbon fiber materials onto existing metal elbows to increase the service life of the elbows.

[0010] 2. Technical solution

[0011] In order to achieve the above object, the technical solution provided by the present invention is:

[0012] The carbon fiber reinforced half-bend tube of the present invention comprises a half-bend tube body, wherein the half-bend tube body is half of a bend tube cut along the axial direction, and the half-bend tube body is the half of the bend tube on one side close to the bending direction, and the bending direction is the direction from the inside to the outside of the bend tube; the half-bend tube body is designed to thicken from both ends A to the middle B and from both sides C to the middle D; a reinforcing protrusion is provided in the middle of the inner side surface of the half-bend tube body, and a carbon fiber mesh layer is sandwiched in the reinforcing protrusion.

[0013] As a further improvement of the present invention, the outer surface of the reinforcing protrusion is an arc-shaped surface protruding toward the inner side surface of the semi-curved tube body.

[0014] As a further improvement of the present invention, the carbon fiber mesh layer is in an arc shape that bulges toward the outer side surface of the semi-curved tube body.

[0015] The casting system of the carbon fiber reinforced half-bend pipe of the present invention comprises a sand mold, which comprises a plurality of half-bend pipe cavities which are parallel to each other and placed horizontally, and the openings of the half-bend pipe cavities are all downward; a half-bend pipe cavity is obtained by combining an upper cavity mold and a lower cavity mold, and the half-bend pipe cavity is used to cast the above carbon fiber reinforced half-bend pipe.

[0016] As a further improvement of the present invention, the corresponding sides of two adjacent half-bend tube cavities are connected with the same ingrate, which is connected to the vertical ingrate through the horizontal ingrate above it, and the vertical ingrate is connected to the pouring cup above it.

[0017] As a further improvement of the present invention, the inner runner is a strip-shaped cavity curved along the side of the semi-curved tube cavity.

[0018] As a further improvement of the present invention, the upper side of the cross runner is two inclined surfaces extending from the middle to both sides in the length direction of the semi-elbow tube cavity, and the lower side of the cross runner is an arc surface matching the upper side of the inner runner.

[0019] As a further improvement of the present invention, each ingrate includes a plurality of sections, and a clay layer is filled between two adjacent sections of the ingrate.

[0020] As a further improvement of the present invention, a riser is provided in the middle of the upper side of the semi-curved tube cavity, and the connection between the riser and the semi-curved tube cavity is a trapezoidal cavity that is larger at the top and smaller at the bottom.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by the present invention has the following significant effects:

[0023] (1) In the present invention, a reinforcing protrusion is provided in the middle of the inner side surface of the semi-curved tube body, and a carbon fiber mesh layer is sandwiched in the reinforcing protrusion, so that the wear resistance of the middle part of the inner side surface of the semi-curved tube body is effectively improved, wherein the reinforcing protrusion protrudes from the inner side surface of the semi-curved tube body, so that the material first comes into friction contact with the reinforcing protrusion, which effectively protects the middle part of the inner side surface of the semi-curved tube body. At the same time, the setting of the reinforcing protrusion provides conditions for the installation of the carbon fiber mesh layer, so that the carbon fiber mesh layer can be effectively positioned and installed near the middle part of the inner side surface of the semi-curved tube body, thereby effectively compounding the carbon fiber material to the semi-curved tube body, and the reinforcing protrusion and the carbon fiber mesh layer cooperate to improve the service life of the semi-curved tube body.

[0024] (2) In the present invention, the outer surface of the reinforcing protrusion is an arc-shaped surface that protrudes toward the inner side surface of the semi-curved tube body. The design of the arc-shaped surface can effectively reduce the friction between the outer surface of the reinforcing protrusion and the material, which is conducive to the smooth passage of the material along the arc-shaped surface. At the same time, the outer surface of the reinforcing protrusion is an arc-shaped surface that protrudes outward, which is matched with the working conditions that the friction impact on the middle of the arc-shaped surface is larger and the friction impact on the two sides of the arc-shaped surface is smaller. After the semi-curved tube body is used for a long time, the reinforcing protrusion is gradually worn to an arc-shaped surface that is adapted to the inner side surface of the semi-curved tube body. At this time, the carbon fiber mesh layer is an arc-shaped layer that protrudes toward the outer side surface of the semi-curved tube body, so that the carbon fiber mesh layer in the middle of the inner side surface of the semi-curved tube body leaks out evenly. The middle of the inner side surface of the entire semi-curved tube body is protected by the carbon fiber mesh layer, which effectively exerts the wear resistance and other characteristics of the carbon fiber mesh layer, and significantly improves the service life of the semi-curved tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a structural schematic diagram of an existing half-bend pipe;

[0027] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle half elbow (F in the figure shows the bending direction of the elbow);

[0028] Figure 3 for Figure 1 Schematic diagram of the longitudinal section structure of the middle half elbow;

[0029] Figure 4 Schematic diagram of the improved area based on the existing half-bend pipe structure in the present invention (the S in the figure is the location of the enhanced protrusion 101);

[0030] Figure 5 Schematic diagram of the longitudinal section structure of the carbon fiber reinforced half-bend tube in the present invention;

[0031] Figure 6 Schematic diagram of the longitudinal section structure of the semi-bent tube cavity in the present invention;

[0032] Figure 7 It is a schematic diagram of the main structure of the sand mold in the present invention;

[0033] Figure 8 The figure is a schematic diagram of the top view of the sand mold of the present invention (the pouring cup and the vertical pouring channel are not shown);

[0034] Fig. 9 for Figure 8 Schematic diagram of the structure along the Z direction (the half-bend tube cavity is not drawn);

[0035] Fig.10 The present invention is a flow chart of the method for manufacturing the carbon fiber reinforced half-bend pipe.

[0036] Explanation of the numbers in the schematic diagram: 1. semi-curved tube body; 101. reinforced protrusion; 102. carbon fiber mesh layer; 2. semi-curved tube cavity; 201. riser; 202. pouring cup; 203. runner; 204. ingent; 3. cavity upper mold; 4. cavity lower mold. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0039] Example 1

[0040] In the prior art, there are related technical solutions for wear-resistant and impact-resistant elbows. The applicant has applied for a related technical solution for a semi-elbow manufacturing method on December 31, 2016 (application number: 201611268911.8), in which the structure of the semi-elbow is referenced. Figure 1-3 . However, the existing iron semi-bend pipe is limited by its own material and it is difficult to further improve its service life. Carbon fiber material itself has outstanding advantages such as wear resistance, high strength, good rigidity and strong flexibility. Based on the above outstanding advantages of carbon fiber material, the prior art proposes to compound carbon fiber material into the manufacturing process of the bend pipe, but a scientific solution for effectively compounding carbon fiber material into the existing metal bend pipe to improve the service life of the bend pipe has not been found.

[0041] refer to Figure 4-10The manufacturing method of the carbon fiber reinforced half-bend pipe of this embodiment includes the following steps: step A, raw material configuration: preparing casting raw materials; step B, making a casting system of the carbon fiber reinforced half-bend pipe; step C, raw material smelting: smelting the casting raw materials into molten iron for casting; step D, installing the carbon fiber mesh layer 102; step E, casting and molding; step F, heat treatment: performing a certain heat treatment on the cast carbon fiber reinforced half-bend pipe.

[0042] In step A, the raw material elements include the following by mass percentage: C: 3.6-3.8%, Cr: 26-28%, Mo: 0.3-0.5%, Cu: 0.4-0.5%, Ni: 0.6-0.8%, V: 0.3-0.5%, Si, Mn are both ≤0.8%, P, S are both ≤0.04%, and the rest is Fe. The raw materials of the above mass percentages are matched with each other. After actual production verification, the wear resistance of the high chromium cast iron cast therefrom is greatly improved, the service life is more than 3 times that of ordinary high manganese steel, and the product hardness can reach HRC: 63-65.

[0043] In step B, the casting system of the carbon fiber reinforced half-bend pipe includes a sand mold made of clay, the sand mold includes a plurality of half-bend pipe cavities 2 which are parallel to each other and placed horizontally, and the openings of the half-bend pipe cavities 2 are all downward; a cavity upper mold 3 and a cavity lower mold 4 are molded together to obtain a half-bend pipe cavity 2, the half-bend pipe cavity 2 is made according to the structure of the carbon fiber reinforced half-bend pipe, and the half-bend pipe cavity 2 is used to cast the carbon fiber reinforced half-bend pipe; the carbon fiber reinforced half-bend pipe includes a half-bend pipe body 1, the half-bend pipe body 1 is half of a bend pipe cut along the axial direction, and the half-bend pipe body 1 is half of the bend pipe on one side close to the bending direction, and the bending direction is the direction from the inside to the outside of the bend pipe ( Figure 2 F in the middle indicates the bending direction of the bent pipe); the semi-bent pipe body 1 is designed to become thicker from the two ends A to the middle B and from the two sides C to the middle D; a reinforcing protrusion 101 is provided in the middle of the inner side surface of the semi-bent pipe body 1, and a carbon fiber mesh layer 102 is sandwiched in the reinforcing protrusion 101, wherein the outer surface of the reinforcing protrusion 101 is an arc-shaped surface protruding toward the inner side surface of the semi-bent pipe body 1, and the carbon fiber mesh layer 102 is an arc-shaped surface protruding toward the outer side surface of the semi-bent pipe body 1.

[0044] In step D, the carbon fiber mesh is first gradually immersed from bottom to top into the molten iron after smelting in step C (that is, the carbon fiber mesh is placed vertically, and then gradually moved downward from the top and immersed in the molten iron below), and then the carbon fiber mesh is taken out. After the carbon fiber mesh is cooled and solidified, a carbon fiber mesh layer 102 is formed. First, the carbon fiber mesh layer 102 is bent into an arc shape, and then the carbon fiber mesh layer 102 is inserted into the area of ​​the lower mold 4 of the cavity for casting the reinforced raised portion 101, and the carbon fiber mesh layer 102 is controlled to be an arc shape that bulges toward the upper mold 3 of the cavity.

[0045] During actual use of the bent pipe, the place that is mainly subject to material impact and wear is the middle part of the inner side surface of the semi-bent pipe body 1. In this embodiment, a reinforcing protrusion 101 is provided in the middle part of the inner side surface of the semi-bent pipe body 1, and a carbon fiber mesh layer 102 is sandwiched in the reinforcing protrusion 101, so that the wear resistance of the middle part of the inner side surface of the semi-bent pipe body 1 is effectively improved. Among them, the reinforcing protrusion 101 protrudes from the inner side surface of the semi-bent pipe body 1, so that the material first comes into friction contact with the reinforcing protrusion 101, which effectively protects the middle part of the inner side surface of the semi-bent pipe body 1. At the same time, the setting of the reinforcing protrusion 101 provides conditions for the installation of the carbon fiber mesh layer 102, so that the carbon fiber mesh layer 102 can be effectively positioned and installed near the middle part of the inner side surface of the semi-bent pipe body 1, thereby effectively compounding the carbon fiber material to the semi-bent pipe body 1, and the reinforcing protrusion 101 and the carbon fiber mesh layer 102 cooperate to improve the service life of the semi-bent pipe body 1.

[0046] In this embodiment, the outer surface of the enhanced protrusion 101 is an arc-shaped surface that protrudes toward the inner side of the semi-curved pipe body 1. The design of the arc-shaped surface can effectively reduce the friction between the outer surface of the enhanced protrusion 101 and the material, which is conducive to the smooth passage of the material along the surface of the arc-shaped surface. At the same time, the outer surface of the enhanced protrusion 101 is an arc-shaped surface that protrudes outward, which is matched with the working conditions that the friction impact on the middle of the arc-shaped surface is larger and the friction impact on both sides of the arc-shaped surface is smaller. After the semi-curved pipe body 1 is used for a long time, the enhanced protrusion 101 is gradually worn to the point where it is in contact with the semi-curved pipe. The inner side surface of the main body 1 is adapted to the arc surface, and at this time the carbon fiber mesh layer 102 is an arc convex toward the outer side surface of the semi-curved tube main body 1 (that is, at this time the reinforced protrusion 101 and the carbon fiber mesh layer 102 are both inwardly concave arc surfaces, and the two remain in a relatively parallel state), so that the carbon fiber mesh layer 102 in the middle of the inner side surface of the semi-curved tube main body 1 leaks out evenly, and the middle part of the inner side surface of the entire semi-curved tube main body 1 is under the protection of the carbon fiber mesh layer 102, effectively exerting the wear resistance and other characteristics of the carbon fiber mesh layer 102, and significantly improving the service life of the semi-curved tube main body 1.

[0047] When the carbon fiber material is composited onto the semi-curved tube body 1, a prominent problem is that when the carbon fiber material is placed in the semi-curved tube cavity 2, the carbon fiber material is easily washed away by the molten iron during the molten iron pouring process, and it is difficult to maintain the planar unfolded state. In step D of this embodiment, the carbon fiber mesh is first gradually immersed in the molten iron from bottom to top, and then the carbon fiber mesh is taken out. After the carbon fiber mesh is cooled and solidified, a carbon fiber mesh layer 102 is formed. The above method can preform the flexible carbon fiber mesh into a carbon fiber mesh layer 102 with a certain rigidity, and then the carbon fiber The mesh layer 102 is bent into an arc shape, and finally the carbon fiber mesh layer 102 is inserted into the area of ​​the cavity lower mold 4 for casting and molding of the reinforced protrusion 101, and the carbon fiber mesh layer 102 is controlled to be an arc shape that bulges toward the cavity upper mold 3, wherein the area of ​​the cavity lower mold 4 for casting and molding of the reinforced protrusion 101 is used for casting and molding the entire reinforced protrusion 101 on the one hand, and for inserting the carbon fiber mesh layer 102 on the other hand, wherein because the carbon fiber mesh layer 102 has a certain elasticity, its two ends can be conveniently inserted into the area of ​​the cavity lower mold 4 for casting and molding of the reinforced protrusion 101.

[0048] Example 2

[0049] The manufacturing method of the carbon fiber reinforced half-curved tube of the present embodiment is basically the same as that of the embodiment 1, and further: the corresponding sides of the two adjacent half-curved tube cavities 2 are connected with the same ingrowth 204, and the ingrowth 204 is connected with the vertical ingrowth through the horizontal ingrowth 203 above it, and the vertical ingrowth is connected with the pouring cup 202 above it; the ingrowth 204 is a strip-shaped cavity curved along the side of the half-curved tube cavity 2; the upper side of the horizontal ingrowth 203 is two inclined surfaces extending from the middle to both sides in the length direction of the half-curved tube cavity 2, and the lower side of the horizontal ingrowth 203 is an arc-shaped surface matching the upper side of the ingrowth 204.

[0050] In this embodiment, the ingrowth 204 is a strip-shaped rectangular cavity bent along the side of the semi-curved tube cavity 2, the cross runner 203 has two inclined surfaces on its upper side extending from the middle to both sides in the length direction of the semi-curved tube cavity 2, and the cross runner 203 has an arc-shaped surface on its lower side that cooperates with the upper side of the ingrowth 204. Through the special structural design of the ingrowth 204 and the cross runner 203, the molten iron can flow evenly and smoothly into the semi-curved tube cavity 2, thereby significantly improving the final casting quality of the carbon fiber reinforced semi-curved tube and avoiding a large number of product defects.

[0051] Example 3

[0052] The manufacturing method of the carbon fiber reinforced half-bend pipe of this embodiment is basically the same as that of Embodiment 2, and further: each ingrate 204 includes a plurality of sections, and a clay layer is filled between two adjacent sections of the ingrate 204.

[0053] In this embodiment, each ingrate 204 is provided to include several sections, and a clay layer is filled between two adjacent sections of the ingrate 204. Since the ingrate 204 adopts an interval segmented structure, the corresponding sides of the two adjacent semi-curved tube cavities 2 are not easily deformed due to the overall solidification of the ingrate 204, thereby greatly improving the dimensional accuracy of the carbon fiber reinforced semi-curved tube casting.

[0054] Example 4

[0055] The manufacturing method of the carbon fiber reinforced half-curved tube of this embodiment is basically the same as that of Embodiment 3, and further: a riser 201 is provided in the middle of the upper side of the half-curved tube cavity 2, and the connection between the riser 201 and the half-curved tube cavity 2 is a trapezoidal cavity with a larger upper part and a smaller lower part.

[0056] In this embodiment, a riser 201 is provided in the middle of the upper side of the semi-curved tube cavity 2. The connection between the riser 201 and the semi-curved tube cavity 2 is a trapezoidal cavity that is larger at the top and smaller at the bottom. Through the setting of the trapezoidal cavity, molten iron can effectively enter the middle of the upper side of the semi-curved tube cavity 2, giving full play to the shrinkage compensation effect of the riser and avoiding the problem of loose core of the product.

[0057] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. The pouring system of carbon fiber reinforced semi-bend pipe is characterized by The invention comprises a sand mold, wherein the sand mold comprises a plurality of semi-curved tube cavities (2) which are parallel to each other and placed horizontally, and the openings of the semi-curved tube cavities (2) are all downward; a cavity upper mold (3) and a cavity lower mold (4) are combined to obtain the semi-curved tube cavity (2), and the semi-curved tube cavity (2) is used to cast a carbon fiber reinforced semi-curved tube; the carbon fiber reinforced semi-curved tube comprises a semi-curved tube body (1), the semi-curved tube body (1) is half of a curved tube cut along the axial direction, and the semi-curved tube body (1) is the half of the curved tube on the side close to the bending direction, and the bending direction is the direction from the inside to the outside of the curved tube; the semi-curved tube body (1) is designed to become thicker from the two ends A to the middle B and from the two sides C to the middle D; a reinforcing protrusion (101) is provided in the middle of the inner side of the semi-curved tube body (1), and a carbon fiber mesh layer (102) is sandwiched in the reinforcing protrusion (101); The outer surface of the reinforcing protrusion (101) is an arc-shaped surface protruding toward the inner side surface of the semi-bent tube body (1); The carbon fiber mesh layer (102) is in the shape of an arc that bulges toward the outer side surface of the semi-curved tube body (1); The cavity lower mold (4) is provided with an area for casting and molding the reinforced protrusion (101).

2. The pouring system for carbon fiber reinforced semi-bend pipe according to claim 1, characterized in that: The corresponding sides of two adjacent half-bend tube cavities (2) are connected to the same ingrate (204), the ingrate (204) is connected to the vertical sprue through the horizontal sprue (203) above it, and the vertical sprue is connected to the pouring cup (202) above it.

3. The pouring system for carbon fiber reinforced half-bend pipe according to claim 2, characterized in that: The inner runner (204) is a strip-shaped cavity that curves along the side of the semi-curved tube cavity (2).

4. The pouring system for carbon fiber reinforced half-bend pipe according to claim 3, characterized in that: The upper side of the cross runner (203) is two inclined surfaces extending from the middle to both sides in the length direction of the semi-curved tube cavity (2), and the lower side of the cross runner (203) is an arc surface matching the upper side of the inner runner (204).

5. The pouring system for carbon fiber reinforced half-bend pipe according to claim 4, characterized in that: Each ingrate (204) includes a plurality of sections, and a clay layer is filled between two adjacent sections of the ingrate (204).

6. The pouring system for carbon fiber reinforced half-bend pipe according to claim 5, characterized in that: A riser (201) is provided in the middle of the upper side of the semi-curved tube cavity (2); the portion where the riser (201) communicates with the semi-curved tube cavity (2) is a trapezoidal cavity that is larger at the top and smaller at the bottom.

Images