A steel wire mesh skeleton composite pipe

Abstract

The invention discloses a steel wire mesh skeleton composite pipe, comprising an inner pipe and an outer pipe, wherein a steel wire layer is bonded between the inner pipe and the outer pipe by bonding resin; a hot melt portion is provided at the connection end of the inner pipe and the outer pipe; a hot melt joint is provided at the hot melt portion; a welding ring is provided at the center of the hot melt joint; a heating plate is provided at the welding ring; the heating plate is annular and has an opening; a first interface and a second interface are provided at both ends of the opening of the annular structure; a first spiral heating wire and a second spiral heating wire are provided at both ends of the welding ring at the inner wall of the hot melt joint; the first spiral heating wire and the second spiral heating wire are connected to the first interface and the second interface respectively, and an external wiring port is provided at the outer end of the first spiral heating wire and the second spiral heating wire, wherein the bonding resin adopts a new formula and a matching preparation process. Compared with the prior art, the invention has the advantages of simple structure, high strength, convenient production and manufacturing, and easy operation.

Description

Technical Field

[0001] The invention relates to the field of composite pipes, and in particular to a steel wire mesh skeleton composite pipe. Background Art

[0002] The wire mesh skeleton polyethylene composite pipe is a new type of pipe that uses a mesh skeleton formed by left and right spiral winding of high-strength steel wire as a reinforcement, high-density polyethylene as a matrix, and high-performance high-density polyethylene and bonding resin to tightly connect the steel wire skeleton with the inner and outer layers of high-density polyethylene.

[0003] In the fields of traditional municipal infrastructure construction, mining and other water supply and drainage, wire mesh skeleton polyethylene reinforced composite pipes have been widely accepted by the market due to their light weight, high pressure bearing capacity, acid and alkali resistance, and easy installation and maintenance. They are currently gradually replacing traditional steel pipes.

[0004] In the preparation process of the wire mesh skeleton composite pipe, the outer tube and the inner tube need to be bonded by bonding resin. Therefore, the characteristics of the bonding resin and the preparation method play a great role in the strength of the entire wire mesh skeleton polyethylene composite pipe pipeline.

[0005] There are two general ways to connect the existing steel mesh skeleton composite pipes. One is threaded sealing connection, and the other is hot-melt connection. The threaded connection has poor sealing performance. The traditional hot-melt connection uses single-layer hot-melt, and the operation steps are cumbersome. If the hot-melt experience is insufficient, the connection effect will be poor. For example, the Chinese invention patent CN106090508B, a connection method and structure of steel mesh skeleton polyethylene composite pipe, requires continuous grinding, cleaning, alignment, and then marking the insertion depth line, which makes the steps very cumbersome. Summary of the invention

[0006] The invention provides a steel wire mesh skeleton composite pipe, which is characterized by simple structure, high strength, convenient production and manufacture, and easy operation.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steel wire mesh skeleton composite pipe, comprising an inner pipe and an outer pipe, a steel wire layer is provided between the inner pipe and the outer pipe; a hot melt portion is provided at the connecting end of the inner pipe and the outer pipe; a hot melt joint is provided at the hot melt portion; the hot melt joint is an inner hollow tubular structure, a welding ring is provided at the center of the interior; an electric heating plate is provided inside the welding ring; the electric heating plate is an annular structure and has an opening; a first interface and a second interface are respectively provided at both ends of the opening of the annular structure; a first spiral heating wire and a second spiral heating wire are respectively provided at both ends of the welding ring at the inner wall of the hot melt joint; the first spiral heating wire and the second spiral heating wire are respectively connected to the first interface and the second interface, and external wiring ports are provided at the outer ends of the first spiral heating wire and the second spiral heating wire.

[0008] As an optimization, the steel wire layer is composed of a plurality of steel wires, and adjacent steel wires are continuously twisted with each other to form a diamond-shaped mesh structure.

[0009] As an optimization, the first spiral heating wire and the second spiral heating wire are both in a spiral structure.

[0010] As an optimization, a breaking layer is provided between the inner tube and the outer tube and the hot-melt portion.

[0011] As an optimization, a hot melt adhesive ring is provided between the joint of the welding ring and the hot melt portion.

[0012] As an optimization, adhesive is filled between the isolation layer and the hot melt joint.

[0013] As an optimization, the external connection port is embedded in the outer end surface of the hot melt joint, and an outer cover is provided at the outer end of the external connection port.

[0014] As an optimization, the outer diameter of the outer tube is consistent with the outer diameter of the hot melt joint; the inner diameters of the inner tube, the hot melt portion and the welding ring are consistent.

[0015] As an optimization, the outer surface of the heat melt joint is provided with grooves; the grooves are provided with four grooves and are symmetrically distributed on the outer periphery of the heat melt joint.

[0016] As an optimization, a heat-insulating layer is provided at the opening of the annular structure of the electric heating plate.

[0017] As an optimization, the steel wire layer is bonded to the inner tube and the outer tube through a bonding resin; the bonding resin includes the following raw materials in parts by weight: 35-55 parts of EVA resin, 15-40 parts of high-density polyethylene resin, 20-40 parts of polypropylene resin, 5-10 parts of styrene-butadiene rubber, 7-15 parts of carbon black, 8-15 parts of environmentally friendly flame retardant, 3-5 parts of paraffin, and 0.5-1.5 parts of antioxidant.

[0018] As an optimization, the step of bonding the steel wire layer to the inner tube and the outer tube includes:

[0019] A1: Weigh the raw materials of each formula according to the formula ratio, pour the raw materials into a high-speed mixer and mix them evenly;

[0020] A2: The mixed material is extruded and granulated by a screw extruder. The barrel heating temperature is set to 180°C, the die temperature is set to 210°C, the screw speed is set to 60rpm, and the feeding speed is set to 50rpm. The material is extruded from the die to obtain a bonding resin.

[0021] A3: preparing a suitable steel wire layer according to the length of the inner tube, and wrapping it around the inner tube, and bonding the bonding resin obtained in step A2 to the inner tube, so that both sides of the steel wire layer are wrapped with the bonding resin;

[0022] A4: The material for preparing the outer tube is extruded into the outer tube preparation mold through an extruder, and is formed on the outer surface of the steel wire layer. Finally, after cooling treatment, the inner tube, steel wire layer and outer tube are prepared into an integrated structure.

[0023] As an optimization, the hot melt connection method steps of the hot melt portion and the hot melt joint are:

[0024] S1: First, hot melt adhesive rings are placed at both ends of the welding ring to improve the hot melting efficiency of the welding ring and the hot melting part;

[0025] S2: Insert the hot melt part of the steel wire mesh skeleton composite pipe directly into the inner end of the hot melt joint to ensure that it is squeezed and connected with the hot melt adhesive ring;

[0026] S3: The length of the hot melt portion can be adjusted by cutting and grinding to ensure that it flows out of the appropriate position, and ensure that when the hot melt portion is completely placed inside the hot melt joint, a certain gap is reserved between the hot melt joint and the breaking layer to ensure that the radial end face of the hot melt portion is extruded and connected with the hot melt adhesive ring;

[0027] S4: Powering on the external connection port, heating the first spiral heating wire, the second spiral heating wire and the heating plate to a melting point, and performing hot-melt connection;

[0028] S5: After the hot melt connection is completed, cooling is performed. After cooling is completed, the gap between the hot melt joint and the isolation layer is filled with adhesive, and the whole process is completed.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the design of the overall internal heating structure is optimized to form two hot-melt connections, thereby ensuring the connection effect; at the same time, the heating component adopts an integrated heating method, which reduces the wiring ports and is more convenient for workers to operate. It is also more convenient when docking the pipe bodies, and there is no need to align the connection ends and mark the insertion depth lines, which greatly optimizes the operation process; at the same time, the structural characteristics of the bonding resin are optimized, effectively ensuring the adhesion between the inner pipe and the outer pipe, thereby improving the overall strength of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the electric heating plate of the present invention;

[0032] Figure 3 It is a schematic structural diagram of the steel wire layer of the present invention.

[0033] Among them, inner tube 1, outer tube 2, steel wire layer 3, hot melt part 4, hot melt joint 5, welding ring 6, electric heating plate 7, first interface 8, second interface 9, first spiral heating wire 10, second spiral heating wire 11, external connection port 12, outer cover 13, hot melt glue ring 14, adhesive 15, isolating layer 16, and slot 17. DETAILED DESCRIPTION

[0034] 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.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] A wire mesh skeleton composite pipe comprises an inner pipe 1 and an outer pipe 2, wherein a steel wire layer 3 is arranged between the inner pipe 1 and the outer pipe 2; the steel wire layer 3 is composed of a plurality of steel wires, and adjacent steel wires are continuously twisted with each other to form a diamond-shaped mesh structure.

[0038] A hot melt portion 4 is provided at the connecting end of the inner tube 1 and the outer tube 2; a hot melt joint 5 is provided at the hot melt portion 4; the hot melt joint 5 is an inner hollow tubular structure, and a welding ring 6 is provided at the center of the inner portion; an electric heating plate 7 is provided inside the welding ring 6; the electric heating plate 7 is an annular structure and has an opening; a heat insulating layer is provided at the opening of the annular structure of the electric heating plate 7. A disconnecting layer 16 is provided between the inner tube 1 and the outer tube 2 and the hot melt portion 4. A hot melt adhesive ring 14 is provided between the welding ring 6 and the hot melt portion 4. Adhesive 15 is filled between the disconnecting layer 16 and the hot melt joint 5.

[0039] The first interface 8 and the second interface 9 are respectively provided at both ends of the opening of the annular structure; the first spiral heating wire 10 and the second spiral heating wire 11 are respectively provided at both ends of the welding ring 6 at the inner wall of the hot melt joint 5; the first spiral heating wire 10 and the second spiral heating wire 11 are both in a spiral structure. The first spiral heating wire 10 and the second spiral heating wire 11 are respectively connected to the first interface 8 and the second interface 9, and the outer ends of the first spiral heating wire 10 and the second spiral heating wire 11 are provided with an external connection port 12. The external connection port 12 is embedded in the outer end surface of the hot melt joint 5, and an outer cover 13 is provided at the outer end of the external connection port 12.

[0040] The outer diameter of the outer tube 2 is consistent with the outer diameter of the hot melt joint 5; the inner diameters of the inner tube 1, the hot melt portion 4 and the welding ring 6 are consistent.

[0041] The outer surface of the heat-melt joint 5 is provided with grooves 17 ; four grooves 17 are provided and symmetrically distributed on the outer circumference of the heat-melt joint 5 .

[0042] Wherein, further, the connection method adopted in the specific connection includes the following steps:

[0043] S1: First, hot melt adhesive rings 14 are placed at both ends of the welding ring 6 to improve the hot melting efficiency of the welding ring 6 and the hot melting part 4;

[0044] S2: directly insert the hot melt part 4 of the steel wire mesh skeleton composite pipe into the inner end of the hot melt joint 5 to ensure that it is squeezed and connected with the hot melt adhesive ring 14;

[0045] S3: The length of the hot melt portion 4 can be adjusted appropriately by cutting and grinding to ensure that it flows out of the appropriate position, and ensure that when the hot melt portion 4 is placed inside the hot melt joint 5, a certain gap is reserved between the hot melt joint 5 and the barrier layer 16 to ensure that the radial end surface of the hot melt portion 4 is squeezed and connected with the hot melt adhesive ring 14;

[0046] S4: Turn on the power to heat the first spiral heating wire 10, the second spiral heating wire 11 and the heating plate 7 to reach the melting point temperature for hot-melt connection;

[0047] S5: After the hot melt connection is completed, cooling is performed. After cooling is completed, the gap between the hot melt joint 5 and the isolation layer 16 is filled with adhesive 15, and the whole process is completed.

[0048] Among them, further, the steel wire layer 3 is bonded to the inner tube 1 and the outer tube 2 by a bonding resin; the bonding resin includes the following raw materials in parts by weight: 35-55 parts of EVA resin, 15-40 parts of high-density polyethylene resin, 20-40 parts of polypropylene resin, 5-10 parts of styrene-butadiene rubber, 7-15 parts of carbon black, 8-15 parts of environmentally friendly flame retardant, 3-5 parts of paraffin, and 0.5-1.5 parts of antioxidant.

[0049] Among them, further, the step of bonding the steel wire layer 3 to the inner tube 1 and the outer tube 2 includes:

[0050] A1: Weigh the raw materials of each formula according to the formula ratio, pour the raw materials into a high-speed mixer and mix them evenly;

[0051] A2: The mixed material is extruded and granulated by a screw extruder. The barrel heating temperature is set to 180°C, the die temperature is set to 210°C, the screw speed is set to 60rpm, and the feeding speed is set to 50rpm. The material is extruded from the die to obtain a bonding resin.

[0052] A3: Prepare a suitable steel wire layer 3 according to the length of the inner tube 1, and wrap it around the inner tube 1, and at the same time, bond the bonding resin obtained in step A2 to the inner tube 1, so that both sides of the steel wire layer 3 are wrapped with the bonding resin;

[0053] A4: The material for preparing the outer tube 2 is extruded into the preparation mold of the outer tube 2 through an extruder, and is formed on the outer surface of the steel wire layer 3. Finally, after cooling treatment, the inner tube 1, the steel wire layer 3 and the outer tube 2 are prepared into an integrated structure.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A steel wire mesh skeleton composite pipe, comprising an inner pipe (1) and an outer pipe (2), characterized in that: A steel wire layer (3) is provided between the inner tube (1) and the outer tube (2); a hot melt portion (4) is provided at the connecting end of the inner tube (1) and the outer tube (2); a hot melt joint (5) is provided at the hot melt portion (4); the hot melt joint (5) is an inner hollow tubular structure, and a welding ring (6) is provided at the center of the inner portion; an electric heating plate (7) is provided inside the welding ring (6); the electric heating plate (7) is an annular structure and has an opening; a first interface (8) and a second interface (9) are provided at both ends of the opening of the annular structure; a first spiral heating wire (10) and a second spiral heating wire (11) are provided at both ends of the welding ring (6) at the inner wall of the hot melt joint (5); the first spiral heating wire (10) and the second spiral heating wire (11) are connected to the first interface (8) and the second interface (9) respectively, and an external wiring port (12) is provided at the outer ends of the first spiral heating wire (10) and the second spiral heating wire (11); A breaking layer (16) is provided between the inner tube (1) and the outer tube (2) and the hot-melt portion (4); a hot-melt adhesive ring (14) is provided between the welding ring (6) and the hot-melt portion (4); an adhesive (15) is filled between the breaking layer (16) and the hot-melt joint (5); and a heat-insulating layer is provided at the opening of the annular structure of the electric heating plate (7); The hot-melt connection method of the hot-melt portion (4) and the hot-melt joint (5) comprises the following steps: S1: firstly, hot melt adhesive rings (14) are placed at both ends of the welding ring (6), and the hot melt adhesive rings (14) are used to improve the hot melt efficiency of the welding ring (6) and the hot melt part (4); S2: directly insert the hot melt portion (4) of the steel wire mesh skeleton composite pipe into the inner end of the hot melt joint (5), ensuring that it is squeezed and connected with the hot melt adhesive ring (14); S3: The length of the hot melt portion (4) can be adjusted by cutting and grinding to ensure that it flows out to a suitable position, and to ensure that when the hot melt portion (4) is completely placed inside the hot melt joint (5), a certain gap is retained between the hot melt joint (5) and the isolation layer (16) to ensure that the radial end surface of the hot melt portion (4) is extruded and connected with the hot melt adhesive ring (14); S4: energizing the external connection port (12), heating the first spiral heating wire (10), the second spiral heating wire (11) and the heating plate (7) to a temperature reaching a thermal melting point, and performing a thermal melting connection; S5: After the hot melt connection is completed, cooling is performed. After cooling is completed, the gap between the hot melt joint (5) and the isolation layer (16) is filled with adhesive (15), and the whole process is completed; The steel wire layer (3) is bonded to the inner tube (1) and the outer tube (2) by means of a bonding resin; the bonding resin comprises the following raw materials in parts by weight: 35-55 parts of EVA resin, 15-40 parts of high-density polyethylene resin, 20-40 parts of polypropylene resin, 5-10 parts of styrene-butadiene rubber, 7-15 parts of carbon black, 8-15 parts of environmentally friendly flame retardant, 3-5 parts of paraffin wax, and 0.5-1.5 parts of antioxidant.

2. The steel wire mesh skeleton composite pipe according to claim 1, characterized in that: The step of bonding the steel wire layer (3) to the inner tube (1) and the outer tube (2) comprises: A1: Weigh the raw materials of each formula according to the formula ratio, pour the raw materials into a high-speed mixer and mix them evenly; A2: The mixed material is extruded and granulated by a screw extruder. The barrel heating temperature is set to 180°C, the die temperature is set to 210°C, the screw speed is set to 60rpm, and the feeding speed is set to 50rpm. The material is extruded from the die to obtain a bonding resin. A3: preparing a suitable steel wire layer (3) according to the length of the inner tube (1), and wrapping and winding the steel wire layer (3) on the inner tube (1), and bonding the bonding resin obtained in step A2 to the inner tube (1) so that both sides of the steel wire layer (3) are wrapped with the bonding resin; A4: The material for preparing the outer tube (2) is extruded into a mold for preparing the outer tube (2) through an extruder, and is molded on the outer surface of the steel wire layer (3). Finally, after a cooling treatment, the inner tube (1), the steel wire layer (3) and the outer tube (2) are prepared into an integrated structure.

3. A steel wire mesh skeleton composite pipe according to claim 2, characterized in that: The steel wire layer (3) is composed of a plurality of steel wires, and adjacent steel wires are continuously twisted with each other to form a diamond-shaped mesh structure.

4. The steel wire mesh skeleton composite pipe according to claim 1, characterized in that: The first spiral heating wire (10) and the second spiral heating wire (11) are both in a spiral structure.

5. The steel wire mesh skeleton composite pipe according to claim 1, characterized in that: The external connection port (12) is embedded in the outer end surface of the hot melt joint (5), and an outer cover (13) is provided at the outer end of the external connection port (12).

6. The steel wire mesh skeleton composite pipe according to claim 1, characterized in that: The outer diameter of the outer tube (2) is consistent with the outer diameter of the hot-melt joint (5); the inner diameters of the inner tube (1), the hot-melt portion (4) and the welding ring (6) are consistent.

7. The steel wire mesh skeleton composite pipe according to claim 1, characterized in that: The outer surface of the hot melt joint (5) is provided with grooves (17); four grooves (17) are provided and are symmetrically distributed on the outer periphery of the hot melt joint (5).

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