End part metal piece composite connecting structure of composite material pipe

Abstract

An end metal piece composite connecting structure of a composite material pipe comprises the composite material pipe, a metal piece and a reinforced connecting assembly, the reinforced connecting assembly comprises an embedded metal sleeve and a plurality of guide pins, and a groove used for being matched with the embedded metal sleeve is formed in the end of one end of the composite material pipe. The embedded metal sleeve is installed in the groove through a binder, an internal thread I is arranged on the inner surface of the embedded metal sleeve, an external thread I matched with the internal thread I is arranged at one end of the metal piece, and the end, where the external thread I is located, of the metal piece is screwed in the embedded metal sleeve through matching of the external thread I and the internal thread I; a plurality of through holes I used for being matched with the guide pins are further formed in the embedded metal sleeve, and through holes II used for being matched with the guide pins are formed in the portions, at the through holes I, of the composite pipe and the metal piece. According to the invention, the tensile strength of the connection part can be greatly enhanced, and the process adaptability is relatively high.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material connection, in particular to a composite material pipe end metal piece composite connection structure. Background Art

[0002] Connecting composite pipes to metal parts is widely used in numerous industrial fields. However, existing conventional adhesive or mechanical connection methods often suffer from insufficient tensile strength when subjected to tensile loads, which can easily lead to failure of the connection and affect the reliability and safety of the overall structure.

[0003] Therefore, it is crucial to develop a composite connection structure for end metal parts that can effectively reinforce composite pipes. Utility Model Content

[0004] The technical problem to be solved by the present invention is to address the deficiencies of the prior art and to provide a composite material pipe end metal component composite connection structure that can significantly enhance the tensile strength of the connection portion and has strong process adaptability.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions: The present invention is a composite pipe end metal fitting composite connection structure, comprising a composite pipe, a metal fitting, and a reinforced connection assembly for connecting the composite pipe and the metal fitting at their ends, the reinforced connection assembly comprising an embedded metal sleeve and a plurality of guide pins, a groove for cooperating with the embedded metal sleeve provided at one end of the composite pipe, the embedded metal sleeve being installed in the groove by means of an adhesive, an internal thread I provided on the inner surface of the embedded metal sleeve, an external thread I cooperating with the internal thread I provided at one end of the metal fitting, the end where the external thread I of the metal fitting is located being screwed into the embedded metal sleeve through the external thread I and the internal thread I; a plurality of through holes I for cooperating with the guide pins are also provided on the embedded metal sleeve, and through holes II for cooperating with the guide pins are provided on both the composite pipe and the metal fitting at the through hole I.

[0006] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the above-mentioned composite pipe end metal fitting composite connection structure, the reinforcement of the composite pipe is a composite of one or more of carbon fiber composite material, glass fiber composite material, basalt fiber composite material, quartz fiber composite material or aramid fiber composite material.

[0007] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the above-mentioned composite pipe end metal fitting composite connection structure, the fiber resin of the composite pipe is epoxy resin, phenolic resin, bismaleimide resin, unsaturated polyester or thermoplastic resin.

[0008] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the composite pipe end metal piece composite connection structure described above, the wall thickness of the composite pipe is 1-5 mm.

[0009] The technical problem to be solved by the present invention can be further achieved through the following technical solution. For the composite material pipe end metal parts composite connection structure described above, an internal thread II is further provided on the inner surface of the groove, and an external thread II that cooperates with the internal thread II is provided on the outer surface of the embedded metal sleeve.

[0010] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the above-mentioned composite pipe end metal parts composite connection structure, the embedded metal sleeve is any one of aluminum alloy, magnesium-aluminum alloy, titanium alloy, copper alloy, or stainless steel.

[0011] The technical problem to be solved by the present invention can be further achieved through the following technical solutions: for the composite material pipe end metal parts composite connection structure described above, the surface of the embedded metal sleeve is further provided with a coating or a passivation layer.

[0012] The technical problem to be solved by the present invention can be further achieved by the following technical solution: for the composite material pipe end metal fitting composite connection structure described above, the adhesive is an epoxy resin, polyurethane or spandex resin adhesive.

[0013] The technical problem to be solved by the present invention can be further achieved through the following technical solutions. For the composite material pipe end metal parts composite connection structure described above, the guide pin is made of stainless steel, tool steel or tungsten carbide.

[0014] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the composite material pipe end metal fitting composite connection structure described above, at least two pairs of through-holes I are provided, and the through-holes I are evenly distributed from one end of the embedded metal sleeve to the other end of the embedded metal sleeve, and the through-holes I are staggered in the horizontal and vertical directions on the embedded metal sleeve.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The utility model greatly enhances the connection strength between the embedded metal sleeve and the groove on the composite pipe by closely fitting them together and fixing them with an adhesive. This structure not only increases the contact area, but also achieves a stronger bond through the chemical action of the adhesive, thereby improving the overall load-bearing capacity.

[0017] 2. The metal part of the present invention is screwed together with the internal thread I of the embedded metal sleeve through its external thread I, forming a tight threaded connection. This connection method is not only self-locking and can resist the influence of external torque and axial force, but also ensures the long-term stability and reliability of the connection. Even in harsh working environments, it can maintain the tightness and functionality of the connection.

[0018] 3. The utility model provides a plurality of pairs of through-holes I on the embedded metal sleeve and the corresponding pairs of through-holes II on the composite pipe and the metal part, which together constitute the installation channel of the guide pin. The insertion of the guide pin not only plays a precise guiding role, ensuring the accurate alignment of the metal part and the composite pipe during the connection process, but also further strengthens the connection structure through its physical support function, thereby improving the overall shear and torsion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural diagram of the utility model;

[0020] Figure 2 This is a structural cross-sectional view of the utility model;

[0021] Figure 3 This is a structural diagram of the embedded metal sleeve of the present utility model. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] Reference Figure 1-3, a composite pipe end metal component composite connection structure, comprising a composite pipe 1, a metal component 2 and a reinforced connection assembly for connecting the composite pipe 1 and the metal component 2 at the end, wherein the reinforcement of the composite pipe 1 is a composite of one or more of carbon fiber composite material, glass fiber composite material, basalt fiber composite material, quartz fiber composite material or aramid fiber composite material, and the fiber resin of the composite pipe 1 is epoxy resin, phenolic resin, bismaleimide resin, unsaturated polyester or thermoplastic resin, so that the composite pipe 1 has the advantages of light weight, high strength and corrosion resistance; in actual use, the composite pipe 1 can be controlled in thickness within the range of 1-5mm according to requirements to meet the needs of different application scenarios; the metal component 2, as another part of the connection structure, is also made of high-strength and corrosion-resistant metal materials, such as aluminum alloy, magnesium-aluminum alloy, etc. The surface of the metal component 2 is roughened to improve the bonding strength with the adhesive and the embedded metal sleeve 3;

[0024] The enhanced connection assembly is a key part of the connection structure. The enhanced connection assembly includes an embedded metal sleeve 3 and several guide pins. A groove for cooperating with the embedded metal sleeve 3 is provided at the end of one end of the composite pipe 1. The embedded metal sleeve 3 is installed in the groove by means of an adhesive. An internal thread I5 is provided on the inner surface of the embedded metal sleeve 3. An external thread I6 cooperating with the internal thread I5 is provided at the end of one end of the metal part 2. The end where the external thread I6 of the metal part 2 is located is screwed into the embedded metal sleeve 3 by means of the external thread I6 cooperating with the internal thread I5. The embedded metal sleeve 3 is also provided with several through-holes I7 for cooperating with the guide pins. The composite pipe 1 and the metal part 2 at the through-holes I7 are both provided with through-holes II4 for cooperating with the guide pins, so that the embedded metal sleeve 3 is installed in the groove of the composite pipe 1 by means of an adhesive and is connected to the metal part 2 by means of threads. The guide pins pass through the through-holes on the composite pipe 1, the metal part 2 and the embedded metal sleeve 3, thereby further enhancing the connection strength.

[0025] Preferably, the guide pins can be adjusted to meet higher tensile strength requirements by adjusting the angle, number, and spacing between the guide pins when connected to the composite material pipe 1, the embedded metal ring, and the metal part 2. Further preferably, at least two perforations I7 are provided, and the perforations I7 are evenly distributed from one end of the embedded metal sleeve 3 to the other end of the embedded metal sleeve 3, and the perforations I7 are staggered horizontally and vertically on the embedded metal sleeve 3, so that at least two guide pins can be installed, and the distribution is arranged horizontally and vertically to further improve the reliability of the connection and meet higher tensile strength requirements.

[0026] In order to further improve the reliability of the connection between the embedded metal sleeve 3 and the composite material pipe 1, an internal thread II is provided on the inner surface of the groove, and an external thread II is provided on the outer surface of the embedded metal sleeve 3 to match the internal thread II, so that the embedded metal sleeve 3 is connected to the composite material pipe 1 through an adhesive and is also connected to the composite material pipe 1 through threads, further improving the reliability and stability of the connection.

[0027] In actual use, the embedded metal sleeve is any one of aluminum alloy, magnesium-aluminum alloy, titanium alloy, copper alloy, or stainless steel, and a coating or passivation layer is further provided on the surface to enhance the performance of the embedded metal sleeve. The coating or passivation layer adopts the coating or passivation layer in the prior art and can be determined according to the actual situation of the embedded metal sleeve, but must match its material to improve the compatibility of the connection;

[0028] The adhesive is an epoxy resin, polyurethane or spandex resin adhesive, which has excellent bonding performance and corrosion resistance; the guide pin is made of stainless steel, tool steel or tungsten carbide, which has high strength to ensure that it will not fail during use.

[0029] The utility model provides a composite pipe and metal fitting composite connection structure at the end, which can significantly improve the tensile strength of the composite pipe and the metal fitting. The specific method of use is as follows:

[0030] 1. Material preparation:

[0031] Select carbon fiber reinforced epoxy resin composite circular tube and stainless steel metal parts. The embedded metal sleeve is made of stainless steel, the guide pin is also made of stainless steel, the adhesive is high temperature resistant epoxy resin adhesive, and the wall thickness of the composite tube is 2.5mm;

[0032] 2. Surface treatment:

[0033] Roughen the inner wall of the composite pipe and the connection surface of the metal parts, and clean them;

[0034] 3. Embedded metal sleeve:

[0035] Select a 1mm thick stainless steel metal sleeve and accurately embed the stainless steel metal sleeve into the connection end of the composite pipe and the metal part to ensure the correct position;

[0036] 4. Processing:

[0037] The end of the carbon fiber tube is processed with an internal thread, and the connection part of the metal part is processed with an external thread. At the same time, the connection part between the end of the carbon fiber tube and the embedded metal sleeve and the metal part is provided with a through hole that cooperates with the guide pin to ensure that the guide pin can actually pass through the carbon fiber tube, the embedded metal sleeve and the metal part and does not exceed the outer surface of the carbon fiber tube, which can further enhance the tensile strength of the connection. At the same time, in order to meet the requirements of higher strength drawing, the angle between the guide pin and the carbon fiber tube, the embedded metal sleeve and the metal part is set to 90°, the number of guide pins is 3, and the spacing between each guide pin is 15mm;

[0038] 5. Apply adhesive:

[0039] Evenly apply high-temperature resistant epoxy resin adhesive on the connection surface between the external thread of the metal part and the internal thread of the carbon fiber round tube, as well as the holes and guide pins that match each other, to ensure that the adhesive can fully fill the connection gaps;

[0040] 6. Connection operation:

[0041] Tighten the metal parts and carbon fiber round tubes by means of internal and external threads, and pass the guide pins through the composite material round tube, the embedded metal sleeve and the metal parts to make them more tightly combined. Then, use a heating device to heat the connection parts to an appropriate temperature to accelerate the curing of the adhesive.

[0042] 7. Quality inspection:

[0043] The tensile strength test was carried out on the connected structural parts. The test results showed that the tensile strength of the connection parts was significantly improved, meeting the design requirements.

[0044] Compared with traditional adhesive connection or mechanical connection methods, the utility model greatly improves the tensile strength of the end metal connection parts of the composite pipe by adding internal and external threads, embedding metal sleeves and guide pins, and can withstand greater tensile loads. At the same time, it improves the stability of the connection, reduces the risk of loosening and failure of the connection parts under tensile loads, and enhances the tensile strength of the connection, which can improve the reliability and durability of the overall structure and extend the service life.

Claims

1. A composite pipe end metal fitting composite connection structure, characterized by: The invention comprises a composite pipe, a metal part and a reinforced connection assembly for connecting the ends of the composite pipe and the metal part. The reinforced connection assembly comprises an embedded metal sleeve and several guide pins. A groove for cooperating with the embedded metal sleeve is provided at the end of one end of the composite pipe. The embedded metal sleeve is installed in the groove by means of an adhesive. An internal thread I is provided on the inner surface of the embedded metal sleeve. An external thread I cooperating with the internal thread I is provided at the end of one end of the metal part. The end where the external thread I of the metal part is located is screwed into the embedded metal sleeve through the external thread I cooperating with the internal thread I. Several through holes I for cooperating with the guide pins are also provided on the embedded metal sleeve. Through holes II for cooperating with the guide pins are provided on the composite pipe and the metal part at the through hole I.

2. The composite material pipe end metal fitting composite connection structure according to claim 1, characterized in that: The reinforcement of the composite material pipe is a composite of one or more of carbon fiber composite materials, glass fiber composite materials, basalt fiber composite materials, quartz fiber composite materials or aramid fiber composite materials.

3. The composite pipe end metal fitting composite connection structure according to claim 1 or 2, characterized in that: The fiber resin of the composite material pipe is epoxy resin, phenolic resin, bismaleimide resin, unsaturated polyester or thermoplastic resin.

4. The composite pipe end metal fitting composite connection structure according to claim 3, characterized in that: The wall thickness of the composite material pipe is 1-5 mm.

5. The composite pipe end metal fitting composite connection structure according to claim 1, characterized in that: An internal thread II is also provided on the inner surface of the groove, and an external thread II matching the internal thread II is provided on the outer surface of the embedded metal sleeve.

6. The composite pipe end metal fitting composite connection structure according to claim 1 or 5, characterized in that: The embedded metal sleeve is any one of aluminum alloy, magnesium aluminum alloy, titanium alloy, copper alloy, or stainless steel.

7. The composite material pipe end metal fitting composite connection structure according to claim 6, characterized in that: The surface of the embedded metal sleeve is further provided with a coating or a passivation layer.

8. The composite material pipe end metal fitting composite connection structure according to claim 1, characterized in that: The adhesive is an epoxy resin, polyurethane or spandex resin adhesive.

9. The composite material pipe end metal fitting composite connection structure according to claim 1, characterized in that: The guide pin is made of stainless steel, tool steel or tungsten carbide.

10. The composite material pipe end metal fitting composite connection structure according to claim 1 or 9, characterized in that: There are at least two pairs of through holes I, which are evenly distributed from one end of the embedded metal sleeve to the other end of the embedded metal sleeve, and the through holes I are staggered in the horizontal and vertical directions on the embedded metal sleeve.

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