Steel fiber prepreg tape reinforced polyethylene composite pipe and connecting assembly

Abstract

The invention provides a steel fiber prepreg tape reinforced polyethylene composite pipe and a connecting assembly, and relates to the technical field of pipes. The steel fiber prepreg tape reinforced polyethylene composite pipe and the connecting assembly comprise a butt joint pipe and two sets of connectors, and the two sets of connectors are arranged at the two axial ends of the butt joint pipe respectively. The two connectors are connected through the butt joint pipe, the abutting part presses the first flange into the connecting groove to prevent falling off, the hose clamp is matched to drive the clamping sleeve to clamp the connectors, the connecting strength is further improved, and the high-pressure conveying pipe can be applied to the high-pressure conveying occasion; double-layer sealing is carried out between the connector and the butt joint pipe through the first sealing ring used for axial sealing and the second sealing ring used for end face sealing, the sealing effect of the connecting position is effectively improved, the multiple sets of protruding rings are arranged on the outer wall of the inner connecting pipe, the friction force between the inner connecting pipe and the inner side wall of the counter bore is increased, and after the hose clamp is locked, the sealing effect is good. The anti-falling effect can be effectively improved, and the anti-pressure capacity of the connecting position is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipes, and in particular to a steel fiber prepreg tape reinforced polyethylene composite pipe and a connecting assembly. Background Art

[0002] Steel fiber prepreg tape reinforced polyethylene composite pipe is a new type of composite material pipe. It uses polyethylene (PE) as the matrix material and adds a certain proportion of steel fibers to enhance its mechanical properties. This pipe combines the advantages of plastics and metals and has the following characteristics: High strength: Due to the addition of steel fibers, this pipe has significantly improved tensile strength, impact strength and bending strength. Corrosion resistance: Polyethylene itself has good chemical corrosion resistance and is suitable for transportation in a variety of corrosive environments. Wear resistance: The addition of steel fibers improves the wear resistance of the pipe and is suitable for conveying fluids containing solid particles. Anti-aging: Polyethylene material has good anti-aging properties and can be used outdoors for a long time. Easy installation: The connection method is simple, such as electric fusion and hot fusion butt connection. Low fluid resistance: The inner wall is smooth, which reduces the resistance during fluid transportation. Wide application: It can be used in petroleum, chemical, municipal water supply and drainage, natural gas transportation, mine tailings transportation and other fields;

[0003] However, in the prior art, steel fiber prepreg tape reinforced polyethylene composite pipes are usually connected to each other by a fixed connection method of hot melting or electric melting, and there is no possibility of subsequent disassembly. This connection method is not applicable in some occasions where disassembly is required. For this reason, a steel skeleton reinforced polyethylene composite pipe is proposed according to the disclosed technology, including a pipe body, wherein the pipe body includes an inner polyethylene layer, a steel skeleton layer, an outer polyethylene layer and a wear-resistant layer from the inside to the outside, the steel skeleton layer is respectively integrated with the outer polyethylene layer and the inner polyethylene layer by hot melt adhesive, the outer surface of the outer polyethylene layer is provided with a wear-resistant layer, and a connecting component is fixedly installed at the interface end of the pipe body. In the disclosed technology, a stable sealed connection between pipelines can be achieved by setting a connection assembly at the pipeline interface, which is convenient for installation and disassembly, and facilitates people's later inspection and replacement of pipelines. However, the connection assembly proposed in the disclosed technology is to compress the second clamping ring by a locking screw, and the two sets of opposite second clamping rings are pressed against each other, so that the locking screw cannot achieve the expected purpose of tightening the pipeline through the second clamping ring, resulting in insufficient fixing force. It only relies on the clamping ring and the annular groove to avoid falling off, and can only be applied to some low-pressure occasions;

[0004] In summary, it is necessary to improve and optimize the steel fiber prepreg tape reinforced polyethylene composite pipe and the connection component structure in order to enable it to be used in high-pressure transportation occasions. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a steel fiber prepreg tape reinforced polyethylene composite pipe and a connecting assembly, which solves the problem that the detachable connecting assembly in the prior art has insufficient fixing force and can only be used for low-pressure transportation.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a connection assembly, including a butt tube and two groups of connecting heads, the two groups of connecting heads are respectively arranged at the axial ends of the butt tube, the two groups of connecting heads and the outer wall of the butt tube are jointly provided with a protective structure, a group of inner connecting pipes are arranged at the axial ends of the butt tube and on the side close to the center of a circle, a group of outer connecting rings are respectively arranged at the axial ends of the butt tube and located on the outer periphery of the inner connecting pipe, a connecting groove is formed between the inner connecting pipe and a group of outer connecting rings on the same side, a first flange is arranged on the outer wall of one end of the connecting head facing the butt tube, a countersunk hole is arranged on the inner wall of one end of the connecting head facing the butt tube, the first flange is slidably connected to the inner wall of the connecting groove, the inner wall of the countersunk hole is slidably connected to the outer wall of the inner connecting tube, the inner diameter of the inner connecting tube is consistent with the inner diameter of the connecting head, and the butt tube and the inner wall of the inner connecting tube are provided with an anti-corrosion coating.

[0009] Preferably, the outer wall of the inner connecting tube is provided with a protruding structure for increasing the friction force at the connection between the inner wall of the counterbore and the outer wall of the inner connecting tube, a first sealing structure for sealing is provided between the outer wall of the inner connecting tube and the inner wall of the counterbore for sliding connection, a second sealing structure for sealing is provided between the first flange and the connecting groove, a second flange is provided at the end of the outer connecting ring away from the docking tube, the second flange is composed of two groups of symmetrical petals, a clamping structure for clamping the first flange is provided at one end of the second flange facing the connecting groove, a jacket is provided at one end of the second flange away from the outer connecting ring, a plurality of groups of avoidance slits are provided on the inner wall of the jacket that are connected inside and outside, and the plurality of groups of avoidance slits are all connected with the end of the jacket away from the second flange, the inner wall of the jacket is slidably connected to the outer wall of the connecting head, and a clamping structure for driving the jacket to clamp the connecting head is provided on the outer wall of the jacket.

[0010] Preferably, the protective structure includes two groups of protective covers and two groups of rubber sleeves. The two groups of protective covers are axially opposite to each other and are slidably connected to the outer wall of the butt tube. The opposite ends of the two groups of protective covers are fixed by threaded connection. The two groups of rubber sleeves are respectively fixedly connected to the opposite ends of the two groups of protective covers. The ends of the two groups of rubber sleeves away from the protective covers are slidably connected to the outer walls of the two groups of connecting heads.

[0011] Preferably, the protrusion structure includes multiple groups of protrusion rings, which are all arranged on the circumferential outer wall of the inner connecting tube and located at an end away from the butt tube, and are distributed in sequence along the axial direction of the inner connecting tube.

[0012] Preferably, the first sealing structure includes two groups of first sealing rings, and two groups of first sealing grooves are arranged on the circumferential outer wall of the inner connecting tube and are located at one end close to the docking tube and distributed in sequence along the axial direction of the docking tube. The two groups of first sealing rings are respectively sleeved inside the two groups of first sealing grooves, and the circumferential outer walls of the two groups of first sealing rings are both slidably connected to the inner wall of the countersunk hole.

[0013] Preferably, the second sealing structure is a second sealing ring, and a second sealing groove is provided on the inner side wall of the connecting groove which is perpendicular to the axial center line of the docking tube. The second sealing ring is arranged inside the second sealing groove, and the side of the second sealing ring away from the docking tube is tightly pressed against one end of the first flange toward the docking tube.

[0014] Preferably, the clamping structure is a clamping portion, which is arranged at an end of the second flange away from the sleeve, and the circumferential outer wall of the clamping portion is slidably connected to the inner wall of the connecting groove, and the first flange and the inner wall of the connecting groove are clamped by the end of the clamping portion away from the second flange.

[0015] Preferably, the clamping structure includes a limiting groove and a throat hoop, the limiting groove is arranged on the circumferential outer wall of the jacket and is located at the end away from the second flange, the throat hoop is arranged inside the limiting groove, the jacket is fixedly connected to the connecting head through the throat hoop, and the connecting head and the inner connecting pipe are fixedly connected through the jacket and the throat hoop.

[0016] Preferably, the circumferential outer wall of the second flange is provided with a plurality of groups of lever holes.

[0017] A steel fiber prepreg tape reinforced polyethylene composite pipe, the steel fiber prepreg tape reinforced polyethylene composite pipe comprises two groups of pipe bodies, the two groups of pipe bodies are connected by using any of the above-mentioned connecting assemblies, the two groups of pipe bodies are axially arranged opposite to each other, and the opposite ends of the two groups of pipe bodies are respectively hot-melt connected to the ends of the two groups of connectors in the above-mentioned connecting assembly that are opposite to each other.

[0018] (III) Beneficial effects

[0019] The present invention provides a steel fiber prepreg tape reinforced polyethylene composite pipe and a connecting assembly. It has the following beneficial effects:

[0020] 1. Compared with the prior art, the steel fiber prepreg tape reinforced polyethylene composite pipe and the connection assembly, the pipe body and the connector are connected by a mature hot-melt method, which is very firm. The two sets of connectors are then connected by a butt tube, and the tightening part presses the first flange into the inside of the connecting groove to prevent it from falling off, and the throat hoop drives the jacket to clamp the connector to further improve the connection strength, so that the steel fiber prepreg tape reinforced polyethylene composite pipe and the connection assembly can be used in high-pressure transmission occasions, and can also be easily dismantled when dismantling is required.

[0021] 2. Compared with the prior art, the steel fiber prepreg tape reinforced polyethylene composite pipe and the connection assembly have double-layer sealing between the connector and the butt pipe through a first sealing ring for axial sealing and a second sealing ring for end face sealing, which effectively improves the sealing effect of the connection.

[0022] 3. Compared with the existing technology, the steel fiber prepreg reinforced polyethylene composite pipe and connecting assembly are provided with multiple sets of convex rings on the outer wall of the inner connecting pipe to increase the friction between the inner connecting pipe and the inner wall of the countersunk hole. After the throat clamp is locked, it can effectively enhance the anti-falling effect and improve the compressive resistance of the connection.

[0023] 4. Compared with the existing technology, the steel fiber prepreg tape reinforced polyethylene composite pipe and connecting assembly are externally protected by protective covers and rubber sleeves on the outside of the butt pipe and the connecting head, which can effectively improve the service life of the butt pipe, the connecting head and the second flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of the present invention after removing the protective cover and the rubber sleeve;

[0026] Figure 3 It is a partial cross-sectional view of the interior of the connector and butt-joint pipe connection structure of the present invention;

[0027] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A;

[0028] Figure 5 It is a partial cross-sectional view of the connection structure of the pipeline body and the connector of the present invention;

[0029] Figure 6 This is a schematic diagram of a petal structure of one group of the second flange of the present invention;

[0030] Figure 7 It is a partial cross-sectional view of the interior of the connection structure of the butt tube, the inner connecting tube and the outer connecting ring of the present invention.

[0031] Among them, 1. pipe body; 2. connector; 201. countersunk hole; 202. first flange; 3. protective cover; 4. rubber sleeve; 5. butt pipe; 501. inner connecting pipe; 5011. convex ring; 502. outer connecting ring; 503. connecting groove; 504. first sealing groove; 505. second sealing groove; 6. second flange; 7. lever hole; 8. jacket; 801. limit groove; 9. avoidance gap; 10. throat clamp; 11. first sealing ring; 12. second sealing ring; 13. tightening part. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments 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 creative work are within the scope of protection of the present invention.

[0033] Example:

[0034] like Figures 1 to 7 As shown, an embodiment of the present invention provides a connection assembly, including a butt-joined tube 5 and two groups of connectors 2, the two groups of connectors 2 are respectively arranged at the axial ends of the butt-joined tube 5, a group of inner connecting tubes 501 are respectively arranged at the axial ends of the butt-joined tube 5 and on the side close to the center of the circle, a group of outer connecting rings 502 are respectively arranged at the axial ends of the butt-joined tube 5 and on the periphery of the inner connecting tube 501, a connecting groove 503 is formed between the inner connecting tube 501 and a group of outer connecting rings 502 on the same side, a first flange 202 is arranged on the outer wall of one end of the connector 2 facing the butt-joined tube 5, a countersunk hole 201 is arranged on the inner wall of one end of the connector 2 facing the butt-joined tube 5, the first flange 202 is slidably connected to the inner wall of the connecting groove 503, the inner wall of the countersunk hole 201 is slidably connected to the outer wall of the inner connecting tube 501, the inner diameter of the inner connecting tube 501 is consistent with the inner diameter of the connector 2, and an anti-corrosion coating is arranged on the inner walls of the butt-joined tube 5 and the inner connecting tube 501, which can effectively improve the service life of the butt-joined tube 5 and the inner connecting tube 501;

[0035] In order to protect the connector 2 and the butt joint pipe 5 from the outside, the two groups of connectors 2 and the outer wall of the butt joint pipe 5 are jointly provided with a protective structure, which includes two groups of protective covers 3 and two groups of rubber sleeves 4. The two groups of protective covers 3 are axially opposite and slidably connected to the outer wall of the butt joint pipe 5. The opposite ends of the two groups of protective covers 3 are fixed by threaded connection. The two groups of rubber sleeves 4 are respectively fixedly connected to the opposite ends of the two groups of protective covers 3. The ends of the two groups of rubber sleeves 4 away from the protective covers 3 are respectively slidably connected to the outer walls of the two groups of connectors 2. The protective covers 3 are first sleeved on the outer wall of the pipe body 1 before the pipe body 1 is connected. When the two groups of pipe bodies 1 are connected, the protective covers 3 sleeved on the outside of the two groups of pipe bodies 1 are brought close to each other and fixed by threaded connection, and the butt joint pipe 5 is protected by the protective covers 3 and the rubber sleeves 4.

[0036] In order to increase the friction of the contact surface to avoid falling off, the outer wall of the inner connecting tube 501 is provided with a protruding structure for increasing the friction of the connection between the inner wall of the counterbore 201 and the outer wall of the inner connecting tube 501. The protruding structure includes multiple groups of protruding rings 5011. The multiple groups of protruding rings 5011 are all arranged on the outer wall of the circumference of the inner connecting tube 501 and are located at the end away from the butt tube 5. The multiple groups of protruding rings 5011 are sequentially distributed along the axial direction of the inner connecting tube 501. The friction between the contact surface between the inner wall of the counterbore 201 and the outer wall of the inner connecting tube 501 is increased by the multiple groups of protruding rings 5011.

[0037] In order to achieve axial sealing at the connection, a first sealing structure for sealing is provided between the outer wall of the slidingly connected inner connecting pipe 501 and the inner wall of the counterbore 201. The first sealing structure includes two groups of first sealing rings 11. Two groups of first sealing grooves 504 are arranged on the circumferential outer wall of the inner connecting pipe 501 and are located at one end close to the butt-joint pipe 5 and are distributed in sequence along the axial direction of the butt-joint pipe 5. The two groups of first sealing rings 11 are respectively sleeved inside the two groups of first sealing grooves 504. The circumferential outer walls of the two groups of first sealing rings 11 are both slidably connected to the inner wall of the counterbore 201. Axial sealing is achieved between the outer wall of the inner connecting pipe 501 and the inner wall of the counterbore 201 through the two groups of first sealing rings 11, so as to prevent the working medium transported inside the pipeline body 1 from leaking from the connection.

[0038] In order to improve the sealing effect of the connection, a second sealing structure for sealing is provided between the first flange 202 and the connection groove 503. The second sealing structure is a second sealing ring 12. The inner side wall of the connection groove 503 perpendicular to the axis of the butt joint pipe 5 is provided with a second sealing groove 505. The second sealing ring 12 is arranged inside the second sealing groove 505. The side of the second sealing ring 12 away from the butt joint pipe 5 is tightly pressed against the end of the first flange 202 facing the butt joint pipe 5. By providing the second sealing ring 12 between the first flange 202 and the connection groove 503, the sealing effect is improved.

[0039] In order to make the connection suitable for high-pressure transmission occasions, a second flange 6 is provided at the end of the outer connecting ring 502 away from the butt pipe 5. The second flange 6 is composed of two groups of symmetrical petals. A clamping structure for clamping the first flange 202 is provided at the end of the second flange 6 facing the connecting groove 503. The clamping structure is a clamping part 13. The clamping part 13 is provided at the end of the second flange 6 away from the jacket 8. The circumferential outer wall of the clamping part 13 is slidably connected to the inner wall of the connecting groove 503. The first flange 202 and the inner wall of the connecting groove 503 are connected by The abutting portion 13 is pressed away from one end of the second flange 6, and a plurality of groups of lever holes 7 are arranged on the circumferential outer wall of the second flange 6. A wrench or round steel commonly available on the market can be inserted into the lever holes 7 to lever the second flange 6 for rotation. When the second flange 6 rotates, the abutting portion 13 can be driven to approach or move away from the butt joint 5 through the threaded connection between the abutting portion 13 and the connecting groove 503. When the second flange 6 is rotated to drive the abutting portion 13 to move closer to the butt joint 5, the first flange 202 can be pressed, so as to achieve the purpose of preventing the connection from falling off during high-pressure transmission.

[0040] In order to further enhance the connection strength, a jacket 8 is provided at the end of the second flange 6 away from the outer connecting ring 502, and a plurality of avoidance slits 9 are provided on the inner wall of the jacket 8 which are connected inside and outside, and the plurality of avoidance slits 9 are all connected with the end of the jacket 8 away from the second flange 6, and the inner wall of the jacket 8 is slidably connected with the outer wall of the connector 2, and a clamping structure for driving the jacket 8 to clamp the connector 2 is provided on the outer wall of the jacket 8, and the clamping structure includes a limiting groove 801 and a throat hoop 10. The limiting groove 801 is provided on the circumferential outer wall of the jacket 8 and is located at the end away from the second flange 6, and the throat hoop 10 is provided inside the limiting groove 801, and the jacket 8 is fixedly connected to the connector 2 through the throat hoop 10, and the connector 2 and the inner connecting pipe 501 are fixedly connected through the jacket 8 and the throat hoop 10, and the plurality of avoidance slits 9 are for the jacket 8 to produce deformation biased toward the axis when being fixed by the throat hoop 10, so as to clamp the outer wall of the connector 2, and the throat hoop 10 is a common connecting fastener on the market.

[0041] The present embodiment also provides a steel fiber prepreg tape reinforced polyethylene composite pipe, which includes two groups of pipe bodies 1. The two groups of pipe bodies 1 are connected using any of the connecting components provided in the above items. The two groups of pipe bodies 1 are axially arranged opposite to each other, and the opposite ends of the two groups of pipe bodies 1 are respectively hot-melt connected to the opposite ends of the two groups of connectors 2 in the connecting component.

[0042] Working principle: The steel fiber prepreg tape reinforced polyethylene composite pipe includes two groups of pipe bodies 1, and the two groups of pipe bodies 1 are connected by using any of the connection components provided by the above items. The two groups of pipe bodies 1 are axially arranged opposite to each other, and the opposite ends of the two groups of pipe bodies 1 are respectively hot-melt connected with the opposite ends of the two groups of connectors 2 in the connection component. The inner walls of the butt-joint pipe 5 and the inner connecting pipe 501 are provided with an anti-corrosion coating, which can effectively improve the service life of the butt-joint pipe 5 and the inner connecting pipe 501. The protective cover 3 is first sleeved on the outer wall of the pipe body 1 before the pipe body 1 is connected. When the two groups of pipe bodies 1 are connected, the protective covers 3 sleeved on the outside of the two groups of pipe bodies 1 are brought close to each other and fixed by threaded connection. The butt-joint pipe 5 is protected by the protective cover 3 and the rubber sleeve 4. The friction between the inner wall of the counterbore 201 and the contact surface of the outer wall of the inner connecting pipe 501 is increased by multiple groups of convex rings 5011. The outer wall of the inner connecting pipe 501 Two groups of first sealing rings 11 are used to achieve axial sealing between the wall and the inner wall of the counterbore 201 to prevent the working medium transported inside the pipeline body 1 from leaking from the connection. A second sealing ring 12 is arranged between the first flange 202 and the connecting groove 503 to improve the sealing effect. A common wrench, round steel, etc. on the market can be inserted into the wrench hole 7 to wrench the second flange 6 for rotation. When the second flange 6 rotates, the tightening part 13 can be driven to approach or move away from the docking pipe 5 through the threaded connection relationship between the tightening part 13 and the connecting groove 503. When the second flange 6 is rotated to drive the tightening part 13 to move close to the docking pipe 5, the first flange 202 can be tightened to achieve the purpose of preventing the connection from falling off during high-pressure transportation. The multiple groups of avoidance gaps 9 are for the purpose of allowing the jacket 8 to deform toward the axis when being fixed by the throat hoop 10 so as to clamp the outer wall of the connector 2. The throat hoop 10 is a common connecting fastener on the market.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection assembly, characterized in that: The invention comprises a butt joint pipe (5) and two groups of connecting heads (2), wherein the two groups of connecting heads (2) are respectively arranged at two axial ends of the butt joint pipe (5), and the two groups of connecting heads (2) and the outer wall of the butt joint pipe (5) are jointly provided with a protective structure, and a group of inner connecting pipes (501) are respectively arranged at two axial ends of the butt joint pipe (5) and on one side close to the center of the circle, and a group of outer connecting rings (502) are respectively arranged at two axial ends of the butt joint pipe (5) and on the periphery of the inner connecting pipe (501), and a connecting groove is formed between the inner connecting pipe (501) and the group of outer connecting rings (502) on the same side. (503), a first flange (202) is provided on the outer wall of one end of the connecting head (2) facing the butt tube (5), a countersunk hole (201) is provided on the inner wall of one end of the connecting head (2) facing the butt tube (5), the first flange (202) is slidably connected to the inner wall of the connecting groove (503), the inner wall of the countersunk hole (201) is slidably connected to the outer wall of the inner connecting tube (501), the inner diameter of the inner connecting tube (501) is consistent with the inner diameter of the connecting head (2), and the inner walls of the butt tube (5) and the inner connecting tube (501) are provided with an anti-corrosion coating.

2. A connection assembly according to claim 1, characterized in that: The outer wall of the inner connecting tube (501) is provided with a protruding structure for increasing the friction force at the connection between the inner wall of the counterbore (201) and the outer wall of the inner connecting tube (501); a first sealing structure for sealing is provided between the outer wall of the inner connecting tube (501) and the inner wall of the counterbore (201) in a sliding connection; a second sealing structure for sealing is provided between the first flange (202) and the connecting groove (503); a second flange (6) is provided at one end of the outer connecting ring (502) away from the butt tube (5); the second flange (6) is composed of two groups of symmetrical petals. The end of the second flange (6) facing the connecting groove (503) is provided with a clamping structure for clamping the first flange (202), and the end of the second flange (6) away from the outer connecting ring (502) is provided with a jacket (8), and the inner wall of the jacket (8) is provided with multiple groups of avoidance slits (9) that are through-through inside and outside, and the multiple groups of avoidance slits (9) are all through-through the end of the jacket (8) away from the second flange (6), the inner wall of the jacket (8) is slidably connected to the outer wall of the connecting head (2), and the outer wall of the jacket (8) is provided with a clamping structure for driving the jacket (8) to clamp the connecting head (2).

3. A connection assembly according to claim 2, characterized in that: The protective structure comprises two groups of protective covers (3) and two groups of rubber sleeves (4); the two groups of protective covers (3) are axially opposed and slidably connected to the outer wall of the butt tube (5); the opposite ends of the two groups of protective covers (3) are fixed by threaded connection; the two groups of rubber sleeves (4) are respectively fixedly connected to the opposite ends of the two groups of protective covers (3); and the ends of the two groups of rubber sleeves (4) away from the protective covers (3) are respectively slidably connected to the outer walls of the two groups of connectors (2).

4. A connection assembly according to claim 3, characterized in that: The protruding structure comprises a plurality of groups of protruding rings (5011), each of which is arranged on the circumferential outer wall of the inner connecting tube (501) and is located at an end away from the butt-jointing tube (5), and each of which is distributed in sequence along the axial direction of the inner connecting tube (501).

5. A connection assembly according to claim 4, characterized in that: The first sealing structure comprises two groups of first sealing rings (11); the circumferential outer wall of the inner connecting tube (501) and one end thereof close to the butt-jointing tube (5) are provided with two groups of first sealing grooves (504) distributed in sequence along the axial direction of the butt-jointing tube (5); the two groups of the first sealing rings (11) are respectively sleeved inside the two groups of first sealing grooves (504); and the circumferential outer walls of the two groups of the first sealing rings (11) are both slidably connected to the inner wall of the counterbore (201).

6. A connection assembly according to claim 5, characterized in that: The second sealing structure is a second sealing ring (12); a second sealing groove (505) is provided on the inner side wall of the connecting groove (503) which is perpendicular to the axis of the butt joint tube (5); the second sealing ring (12) is arranged inside the second sealing groove (505); a side of the second sealing ring (12) away from the butt joint tube (5) is pressed against an end of the first flange (202) facing the butt joint tube (5).

7. A connection assembly according to claim 6, characterized in that: The clamping structure is a clamping portion (13), which is arranged at the end of the second flange (6) away from the jacket (8), and the circumferential outer wall of the clamping portion (13) is slidably connected to the inner wall of the connecting groove (503), and the first flange (202) and the inner wall of the connecting groove (503) are clamped by the end of the clamping portion (13) away from the second flange (6).

8. A connection assembly according to claim 7, characterized in that: The clamping structure comprises a limiting groove (801) and a throat hoop (10); the limiting groove (801) is arranged on the circumferential outer wall of the jacket (8) and is located at an end away from the second flange (6); the throat hoop (10) is arranged inside the limiting groove (801); the jacket (8) is fixedly connected to the connector (2) via the throat hoop (10); and the connector (2) and the inner connecting pipe (501) are fixedly connected via the jacket (8) and the throat hoop (10).

9. A connection assembly according to claim 8, characterized in that: The circumferential outer wall of the second flange (6) is provided with a plurality of groups of lever holes (7).

10. A steel fiber prepreg tape reinforced polyethylene composite pipe, characterized in that: The steel fiber prepreg tape reinforced polyethylene composite pipe comprises two groups of pipe bodies (1), the two groups of pipe bodies (1) are connected by using the connecting assembly described in any one of claims 1 to 9, the two groups of pipe bodies (1) are axially arranged opposite to each other, and the opposite ends of the two groups of pipe bodies (1) are respectively hot-melt connected to the opposite ends of the two groups of connectors (2) in the connecting assembly described in claim 1.

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