Steel wire mesh reinforced polyethylene composite pipe capable of being in direct hot melting butt joint

Abstract

The utility model discloses a steel wire mesh reinforced polyethylene composite pipe capable of being directly hot-melted and butt-jointed, which relates to the technical field of pipes and comprises a base pipe and a butt joint which are made of the same thermoplastic plastics and can be directly and simultaneously heated to be subjected to injection molding and fusion welding to form an integral structure. The steel wire mesh reinforced polyethylene composite pipe can be directly connected in a hot melting butt joint mode, the quality of a pipeline system is more reliable, construction is easy and convenient, and the comprehensive cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of pipes, in particular to a steel wire mesh reinforced polyethylene composite pipe that can be directly hot-melt-jointed. Background Art

[0002] Cross helically wound steel wires reinforced-polyethylene composite pipe (SRCP) refers to a composite pipe formed by melting and compounding with polyethylene as the matrix, a mesh skeleton formed by continuous spiral winding of steel wires coated with adhesive resin as the reinforcement, and the reinforcement and the matrix are tightly connected into one body with adhesive resin. Because it combines the strength of steel wire with the corrosion resistance and flexibility of polyethylene, the pipe has sufficient strength and can adapt to various complex environmental conditions. With its unique properties, it has been widely used in many fields such as construction, municipal administration, industry and mining, agriculture, etc., such as: municipal water supply, oil and gas transportation, and can even be used to transport corrosive media such as acid, alkali, salt, etc.

[0003] Since the middle layer of the wire mesh reinforced polyethylene composite pipe is steel wire, the steel wire layer will corrode and age if it is in contact with water for a long time, and the pressure bearing performance of the pipe wall will decrease, eventually causing the risk of water leakage in the pipeline system. To solve this problem, the current main reliance is on using polyethylene welding rods to seal the ports. However, this process has major defects. After a few years of use, the seal will crack and water will still seep into the steel wire layer. In addition, the current wire mesh reinforced polyethylene composite pipe cannot be hot-melt butt-jointed, but can only be connected by electric fusion. The manufacturing process of special electric fusion pipe fittings is complicated and the price is usually high, which will also increase the overall cost of the project.

[0004] In summary, it is not difficult to see that the reliability of the steel wire layer sealing and the connection method of the steel wire mesh reinforced polyethylene composite pipe port directly determine the quality and safety of the pipeline system and the project cost. How to design a steel wire mesh reinforced polyethylene composite pipe that is easy to construct, reliable in quality, and low in cost is an important technical difficulty faced by the industry. Summary of the invention

[0005] In order to solve the problems that the existing wire mesh reinforced polyethylene composite pipes have unstable port sealing and can only be connected by electric fusion, as well as the major quality and safety hazards caused by the difficulty in construction and high cost, the utility model proposes a wire mesh reinforced polyethylene composite pipe that can be directly hot-melt-jointed.

[0006] The technical solution of the utility model is a steel wire mesh reinforced polyethylene composite pipe that can be directly hot-melt butt-jointed, characterized in that it comprises a base pipe and a butt joint, the base pipe and the butt joint are made of the same thermoplastic plastic, the base pipe and the butt joint are integrally formed by injection molding, so that the base pipe and the butt joint can be melted into an integral structure to ensure that the port is securely sealed.

[0007] The butt joint is made of thermoplastic plastic and can be directly hot-melt butted.

[0008] The outer surfaces of the base pipe and the butt joint are provided with butt positioning lines to ensure the coaxiality when the pipes are connected.

[0009] The beneficial effects achieved by the utility model are:

[0010] The utility model discloses a wire mesh reinforced polyethylene composite pipe that can be directly hot-melt-jointed, which solves the prominent problems that the ports of traditional wire mesh reinforced polyethylene composite pipes are not firmly sealed and can only be connected by electric fusion, which brings major quality and safety hazards to the pipeline interface, great construction difficulty and high cost. The wire mesh reinforced polyethylene composite pipe connection has the advantages of direct hot-melt jointing, more reliable pipeline system quality, simple construction and low overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the utility model;

[0012] Description of the reference numerals: base pipe - 1; butt joint - 2; butt positioning line - 3. DETAILED DESCRIPTION

[0013] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0014] like Figure 1 As shown, the wire mesh reinforced polyethylene composite pipe material provided in this embodiment is composed of a base pipe 1 and a butt joint 2. Different from the existing wire mesh reinforced polyethylene composite pipe material, the base pipe 1 and the butt joint 2 are the same thermoplastic plastic and can be directly heated and injection-molded at the same time, so that the base pipe 1 and the butt joint 2 can be melted into an integrated structure. The outer surfaces of the base pipe 1 and the butt joint 2 are provided with butt positioning lines 3 to ensure the coaxiality when the pipes are connected.

[0015] The preparation method of the steel wire mesh reinforced polyethylene composite pipe that can be directly hot-melt-butted is as follows:

[0016] The continuously produced wire mesh reinforced polyethylene composite pipe is cut to a fixed length according to the length required by the customer, and the ends of the cut pipe are sent to a special injection molding machine to obtain a wire mesh reinforced polyethylene composite pipe with a hot-melt butt joint that can be directly hot-melt-jointed.

[0017] On-site hot-melt butt welding operation steps:

[0018] Preliminary preparation: First, clamp the base pipe 1 in the corresponding fixture according to the actual pipe diameter, lift the other end of each pipe to the same horizontal plane with a pipe bracket, preheat and adjust to the appropriate welding temperature, generally 220℃±10℃, align and fix the butt joints 2 to be connected on the welding equipment, and straighten the corresponding butt joints 2 to be connected through the butt positioning lines on the base pipe 1 and the butt joints 2 so that they are on the same axis, and the misalignment should not be greater than 10% of the wall thickness. Clean the impurities on the surface of the butt joint 2 to ensure that the end face of the butt joint 2 of the wire mesh reinforced polyethylene composite pipe to be connected is flat, scratch-free, clean and free of impurities.

[0019] Butt-melt: Use a hot-melt welding machine to heat the butt joints 2 of the two wire mesh reinforced polyethylene composite pipes respectively, so that the butt joints 2 are softened and melted evenly, place the electric heating plate between the two pipe butt joints 2, and operate the electric hydraulic device to make the two pipe butt joints 2 completely contact and heat with the electric heating plate at the same time. When the butt joints 2 are melted, quickly connect the two base pipes 1 together, and apply appropriate pressure to make the butt joints 2 fully combined, then remove the electric heating plate, and operate the hydraulic device again electrically to make the two melted pipe butt joints 2 fully butt and lock the electric hydraulic device to prevent rebound.

[0020] Cooling and solidification: After the connection is completed, quickly adjust the welding pressure within the specified time to close the clamp, and start recording the cooling time of the pipe, waiting for the two pipe ends of the joint to cool naturally until solidification.

[0021] Inspection: Perform visual inspection on the welded parts to ensure that the connection is firm, without leakage and deformation. Check that the heating surface of the joint 2 is evenly melted, the flange is symmetrical and full, and there are no impurities, bubbles and other undesirable phenomena. After the construction is completed and the pressure test is passed, it can be buried and put into use.

[0022] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A steel wire mesh reinforced polyethylene composite pipe that can be directly hot-melt butt-jointed, characterized in that: The invention comprises two parts, a base tube (1) and a butt joint (2). The base tube (1) and the butt joint (2) are made of the same thermoplastic plastic and can be directly heated simultaneously for injection welding, so that the base tube (1) and the butt joint (2) can be melted into an integral structure and the port is securely sealed.

2. The steel wire mesh reinforced polyethylene composite pipe capable of direct hot-melt butt welding as claimed in claim 1, characterized in that: The outer surfaces of the base pipe (1) and the butt joint (2) are provided with butt joint positioning lines (3) to ensure the coaxiality when the pipes are connected.

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