A spigot and socket joint type high-density polyethylene solid wall pipe and a method for manufacturing the same

Abstract

This invention discloses a socket-type high-density polyethylene solid-wall pipe and its preparation method, belonging to the field of pipe manufacturing technology. The solid-wall pipe includes a pipe body, one end of which has an extrusion joint pre-installed through an extrusion process, and the other end of the pipe body is fitted with a cap-type rubber ring. The preparation method of the solid-wall pipe is as follows: after the end of the pipe body is preheated and shaped, the end of the pipe body is placed in the cavity formed by the upper outer mold, the core mold, and the lower outer mold. Then, the left and right injection machines are started to fill the cavity formed by the upper outer mold, the core mold, and the lower outer mold with high-pressure injection of high-density polyethylene material. The high-density polyethylene material is shaped into an extrusion joint. After the extrusion joint cools, the solid-wall pipe is obtained. This invention changes the original traditional connection method to a socket type, which greatly improves the actual assembly efficiency. By preheating and shaping the pipe body, the bonding stability and firmness between the pipe body and the extrusion joint after coating are greatly increased.

Description

Technical Field

[0001] This invention belongs to the field of pipeline manufacturing technology, specifically relating to a socket-connected high-density polyethylene solid-wall pipe and its preparation method. Background Technology

[0002] Currently, the high-density polyethylene (HDPE) solid-wall pipe industry mainly divides it into HDPE water supply pipes and HDPE drainage pipes. HDPE drainage pipes are mostly designed as trenchless, with a few being trenchless, depending on actual design needs. Existing methods for connecting HDPE solid-wall pipes primarily include hot-melt welding, flange locking, and electrofusion joints, all of which are relatively mature. However, these methods are limited by their cumbersome operation (for example, the most common hot-melt method requires a special pipe-cutting mechanism to smoothly cut the pipe end face, then a special plate to heat the end face, and finally a clamping fixture to evenly connect the pipes. In practice, the pipe-cutting mechanism is heavy and difficult to move, and power supply issues can arise during inclement weather), relatively high costs, and high requirements for weather and other environmental conditions, which can affect the overall construction progress.

[0003] With the continuous changes and development of the industry, the proportion of open-cut high-density polyethylene drainage pipes is gradually increasing. When constructing open-cut high-density polyethylene drainage pipes, the trench is completed first, and then the pipes are laid. The pipes are mainly for pressureless drainage. If traditional welding and other methods are still used during construction, the construction progress will be greatly reduced, resulting in unnecessary waste of manpower and material resources. Summary of the Invention

[0004] The purpose of this invention is to provide a socket-type high-density polyethylene solid-wall pipe and its preparation method. By improving the structure of the two ends of the solid-wall pipe (one end is fitted with a cap-type rubber ring; the other end is pre-set with an extrusion joint), the socket installation of the solid-wall pipe is realized. At the same time, this invention discloses in detail the extrusion process of the extrusion joint, ultimately achieving efficient construction of the solid-wall pipe.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A socket-type high-density polyethylene solid-wall pipe includes a high-density polyethylene solid-wall pipe body, one end of the pipe body is pre-installed with an extrusion joint through an extrusion process, and the other end of the pipe body is fitted with a cap-type rubber ring.

[0007] The detailed structure of the above-mentioned cap-type rubber ring is based on the inventor's published utility model patent, patent number CN207246616U, which describes a cap-type damping sealing rubber ring for hollow wall wound pipe socket joints. It will not be described in detail here.

[0008] Furthermore, the preparation method of the socket-connected high-density polyethylene solid-wall pipe includes the following steps:

[0009] S1. The tube body moves forward under the push of the support frame of the extrusion device until the end of the tube body reaches the limiting ring of the mandrel and stops.

[0010] S2. Start the upper and lower templates. The upper template moves the upper outer mold downwards, and the lower template moves the lower outer mold upwards. The upper and lower outer molds quickly close together. Tighten the positioning pins. Then, start the left and right injection machines to move to the injection position and start the injection process of the left and right injection machines. The high-density polyethylene material is injected under high pressure to fill the cavity composed of the upper outer mold, core mold and lower outer mold. The high-density polyethylene material is shaped into an extrusion joint.

[0011] S3. After the extrusion joint cools down, start the left and right glue injection machines to return to their original positions, start the upper and lower templates to reset, and obtain a socket-connected high-density polyethylene solid wall pipe.

[0012] Furthermore, before the extrusion joint is formed, the ends of the tube body need to undergo preheating and shaping treatment. The preheating and shaping treatment process is as follows:

[0013] A1. Place the pipe body on the support frame, activate the upper and lower Haval clamps. The upper Haval clamp moves downward and the lower Haval clamp moves upward until the pipe body is locked.

[0014] A2. The serrated heating plates on the inner sides of the upper and lower Haval plates begin to heat up until the outer wall of the tube melts. At the same time, the upper and lower Haval plates continuously tighten, and corresponding sawtooth grooves appear on the outer wall of the tube. Then, the upper and lower Haval plates quickly open, and the tube moves forward under the push of the support frame, starting the preparation of the socket-connected high-density polyethylene solid wall tube.

[0015] Furthermore, the extrusion device includes a support frame, on one side of which a machine frame is fixedly installed. An upper mold plate and a lower mold plate are installed inside the machine frame. The upper mold plate and the lower mold plate are driven by a motor to move up and down in the vertical direction. An upper outer mold is fixedly installed below the upper mold plate, and a lower outer mold is fixedly installed above the lower mold plate. A core mold is provided inside the lower outer mold and the upper outer mold. One end of the core mold is fixedly connected to the machine frame. The upper outer mold, the core mold, and the lower outer mold are combined to form a mold cavity. A left injection machine and a right injection machine are connected to both sides of the mold cavity. The left injection machine and the right injection machine are located on both sides of the machine frame.

[0016] Furthermore, a limiting ring is provided on the side of the core mold near the support frame.

[0017] Furthermore, four locating pins are installed at the connection between the upper and lower outer molds. The locating pins help to ensure a tight connection between the upper and lower outer molds.

[0018] Furthermore, the upper outer mold and the lower outer mold are provided with an upper Haval clamping plate and a lower Haval clamping plate on the side facing the tube body. The upper Haval clamping plate is slidably installed with the upper template, and the lower Haval clamping plate is slidably installed with the lower template. The inner side of the upper Haval clamping plate and the inner side of the lower Haval clamping plate are combined to form a ring. The outer wall of the tube body is adapted to the ring. The inner side of both the upper Haval clamping plate and the lower Haval clamping plate is equipped with a toothed heating plate.

[0019] The beneficial effects of this invention are:

[0020] 1. In this invention, the end of the high-density polyethylene solid wall pipe is pre-installed with an extrusion joint through extrusion technology, which changes the original traditional connection method to a socket type, greatly improving the actual assembly efficiency.

[0021] 2. This invention preheats the toothed heating plates of the upper and lower Haval plates, and preheats and presses the teeth on the port of the pipe body to be covered by the extrusion joint before extrusion. The molten port surface and the toothed appearance increase the bonding strength and bonding contact area between the pipe body and the extrusion joint, and greatly increase the bonding stability and strength between the pipe body and the extrusion joint after covering.

[0022] 3. In the extrusion device of the present invention, the integrated design of the toothed heating plate of the preheating upper and lower Haval clamping plates and the extrusion joint mold greatly improves the efficiency of the on-site preparation process.

[0023] 4. In this invention, the other end of the pipe can be directly installed with a cap-type rubber ring to complete the socket installation, which can ensure the strength of the pipe while improving the production efficiency of socket-connected high-density polyethylene solid wall pipes. Attached Figure Description

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the extrusion device of the present invention. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the extrusion device of the present invention. Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the extrusion device of the present invention. Figure 3 ;

[0028] Figure 4 This is a schematic diagram of the structure of the upper and lower Haval clamps of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the upper outer mold, core mold, and lower outer mold of the present invention. Figure 1 ;

[0030] Figure 6 This is a schematic diagram of the structure of the upper outer mold, core mold, and lower outer mold of the present invention. Figure 2 ;

[0031] Figure 7 This is an installation diagram of a socket-connected high-density polyethylene solid-wall pipe according to the present invention;

[0032] Figure 8 This is a schematic cross-sectional view of the installation of a socket-connected high-density polyethylene solid-wall pipe according to the present invention.

[0033] In the diagram: 1. Pipe body; 11. Extrusion joint; 12. Cap-type rubber ring; 2. Support bracket; 3. Frame; 41. Left injection machine; 42. Right injection machine; 51. Upper template; 52. Lower template; 61. Upper outer mold; 62. Lower outer mold; 63. Positioning pin; 7. Core mold; 71. Limiting ring; 81. Upper Haval clamping plate; 82. Lower Haval clamping plate; 83. Convex tooth heating plate. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] A socket-type high-density polyethylene solid-wall pipe:

[0037] Please see Figures 7-8 As shown, a socket-type high-density polyethylene solid-wall pipe includes a high-density polyethylene solid-wall pipe body 1. One end of the pipe body 1 is provided with an extrusion joint 11, and the other end of the pipe body 1 is fitted with a cap-type rubber ring 12. The extrusion joint 11 is pre-installed at one end of the pipe body 1 through an extrusion process, and the cap-type rubber ring 12 is fitted at the other end of the pipe body 1. The cap-type rubber ring 12 and the extrusion joint 11 of the pipe body 1, which are connected end to end, fit tightly with each other. The high-density polyethylene solid-wall pipe produced by this invention is mainly used in the type of excavation pipe body 1. Compared with the traditional installation process, it mainly involves pre-fabricating an extrusion joint 11 on the pipe body 1 of the high-density polyethylene solid-wall pipe. The traditional welding method is transformed into a socket method through the cooperation of the extrusion joint 11 and the cap-type rubber ring 12.

[0038] Example 2

[0039] Extrusion device;

[0040] Please see Figures 1-6As shown, the extrusion device includes a support frame 2. The tube body 1 is placed on the support frame 2 when the extrusion joint 11 is inserted. A frame 3 is fixedly installed on one side of the support frame 2. An upper template 51 and a lower template 52 are installed inside the frame 3. One end of the tube body 1 is placed between the upper template 51 and the lower template 52. The upper template 51 and the lower template 52 are driven by a motor and can move up and down vertically. An upper outer mold 61 is fixedly installed below the upper template 51, and a lower outer mold 62 is fixedly installed above the lower template 52. A core mold 7 is provided inside the lower outer mold 62 and the upper outer mold 61. One end of the core mold 7 is fixedly connected to the frame 3. A limit ring 71 is provided on the side of the core mold 7 near the support frame 2. During the extrusion process, one end of the tube body 1 is placed in the mold cavity formed by the combination of the upper outer mold 61, the core mold 7, and the lower outer mold 62. Inside, four positioning pins 63 are installed at the connection between the upper outer mold 61 and the lower outer mold 62. The positioning pins 63 and the support bracket 2 help to ensure a tight connection between the upper outer mold 61 and the lower outer mold 62. The left and right glue injection machines 41 and 42 are connected to the two sides of the mold cavity. The left and right glue injection machines 41 and 42 are located on both sides of the frame 3. The upper outer mold 61 and the lower outer mold 62 are provided with an upper Haval clamping plate 81 and a lower Haval clamping plate 82 on the side facing the tube body 1. The upper Haval clamping plate 81 is slidably installed with the upper template 51, and the lower Haval clamping plate 82 is slidably installed with the lower template 52. The inner side of the upper Haval clamping plate 81 and the inner side of the lower Haval clamping plate 82 are combined to form a ring. The outer wall of the tube body 1 is adapted to the ring. The inner side of the upper Haval clamping plate 81 and the lower Haval clamping plate 82 are both equipped with toothed heating plates 83.

[0041] Example 3

[0042] A method for preparing a socket-type high-density polyethylene solid-wall pipe:

[0043] Please see Figures 1-8 As shown, a method for preparing a socket-type high-density polyethylene solid-wall pipe includes the following steps:

[0044] S1. The pipe body 1 of the excavation type high-density polyethylene solid wall pipe is pushed by the support frame 2 of the extrusion device and stops at the set limit position. At this time, the upper Haval clamp 81 and the lower Haval clamp 82 are activated. The upper Haval clamp 81 moves downward and the lower Haval clamp 82 moves upward until the pipe body 1 is stuck.

[0045] S2. Under the control of the PLC, the toothed heating plates 83 on the inner side of the upper Haval clamping plate 81 and the lower Haval clamping plate 82 heat up rapidly. As the temperature rises rapidly, the outer wall of the tube body 1 melts rapidly. At the same time, the upper Haval clamping plate 81 and the lower Haval clamping plate 82 lock together, and a sawtooth groove appears on the outer wall of the tube body 1.

[0046] S3, the upper Haval clamp 81 and the lower Haval clamp 82 open rapidly. At the same time, the tube 1 moves forward under the push of the support frame 2 until the end of the tube 1 reaches the limiting ring 71 of the core mold 7 and stops.

[0047] S4. Start the upper template 51 and the lower template 52. The upper template 51 drives the upper outer mold 61 to move down, and the lower template 52 drives the lower outer mold 62 to move up. The upper outer mold 61 and the lower outer mold 62 quickly close together. Tighten the positioning pin 63. Under the action of the positioning pin 63, the upper outer mold 61 and the lower outer mold 62 are tightly connected. Then, the left injection machine 41 and the right injection machine 42 quickly move towards each other to the injection position and start the injection process of the left injection machine 41 and the right injection machine 42. The high-density polyethylene material is filled into the cavity composed of the upper outer mold 61, the core mold 7 and the lower outer mold 62 by high-pressure injection. The high-density polyethylene material is shaped into the extrusion joint 11.

[0048] S5. After the extrusion joint 11 cools down, the left glue injection machine 41 and the right glue injection machine 42 return to their original positions. The upper template 51 and the lower template 52 drive the upper outer mold 61 and the lower outer mold 62 to return to their original positions. The pipe body 1 of the extrusion joint 11 is moved to the support frame 2, completing the preparation process of the socket connection type high-density polyethylene solid wall pipe.

[0049] Example 4

[0050] Installation process of socket-type high-density polyethylene solid-wall pipe:

[0051] In actual construction, it is only necessary to install a cap-type rubber ring 12 at the spigot end of the pipe body 1, and then insert the spigot end (including the end with the cap-type rubber ring 12) into the extrusion joint 11 of the adjacent pipe body 1, ensuring that the spigot end reaches the specified position and stops, and the installation is completed. The whole installation process is simple and convenient, requiring no special tools, and is not subject to water, electricity, gas, or other restrictions, nor is it affected by severe weather. Installation can be carried out directly in the trench.

[0052] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A socket-type high-density polyethylene solid-wall pipe, characterized in that, It includes a tube body (1), one end of which is pre-installed with an extrusion joint (11) through an extrusion process, and the other end of the tube body (1) is fitted with a cap-type rubber ring (12). Before the pre-installed extrusion joint (11), the end of the tube body (1) needs to be preheated and shaped. The preheating and shaping process is as follows: A1. Place the tube body (1) on the support frame (2), start the upper Haval clamp (81) and the lower Haval clamp (82), the upper Haval clamp (81) moves downward and the lower Haval clamp (82) moves upward until the tube body (1) is locked. A2. The convex toothed heating plate (83) on the inner side of the upper Haval plate (81) and the lower Haval plate (82) begins to heat up until the outer wall of the tube body (1) melts. At the same time, the upper Haval plate (81) and the lower Haval plate (82) are continuously locked, and a sawtooth groove appears on the outer wall of the tube body (1). Then, the upper Haval plate (81) and the lower Haval plate (82) are opened, and the tube body (1) moves forward under the push of the support frame (2) to begin the preparation of the socket connection type high-density polyethylene solid wall tube. The upper outer mold (61) and the lower outer mold (62) are provided with an upper Haval clamp (81) and a lower Haval clamp (82) on the side facing the tube body (1). The upper Haval clamp (81) is slidably installed with the upper template (51), and the lower Haval clamp (82) is slidably installed with the lower template (52). The inner side of the upper Haval clamp (81) and the inner side of the lower Haval clamp (82) are adapted to the outer wall of the tube body (1). The inner sides of the upper Haval clamp (81) and the lower Haval clamp (82) are both equipped with toothed heating plates (83).

2. The method for preparing a socket-connected high-density polyethylene solid-wall pipe according to claim 1, characterized in that, Includes the following steps: S1. The tube (1) moves forward under the push of the support frame (2) of the extrusion device until the end of the tube (1) reaches the limiting ring (71) of the core mold (7) and stops. S2. Start the upper template (51) and lower template (52). The upper template (51) drives the upper outer mold (61) to move down, and the lower template (52) drives the lower outer mold (62) to move up. The upper outer mold (61) and lower outer mold (62) close together and tighten the positioning pin (63). Then, start the left injection machine (41) and right injection machine (42) to move to the injection position and start the injection process of the left injection machine (41) and right injection machine (42) to fill the cavity composed of the upper outer mold (61), core mold (7) and lower outer mold (62) with high pressure injection. The high density polyethylene material is shaped into an extrusion joint (11). S3. After the extrusion joint (11) cools down, start the left glue injection machine (41) and the right glue injection machine (42) to return to their original positions, start the upper template (51) and the lower template (52) to reset, and obtain the socket connection type high-density polyethylene solid wall pipe.

3. The method for preparing a socket-connected high-density polyethylene solid-wall pipe according to claim 2, characterized in that, The extrusion device includes a support frame (2), a frame (3) is fixedly installed on one side of the support frame (2), an upper template (51) and a lower template (52) are installed inside the frame (3), an upper outer mold (61) is fixedly installed below the upper template (51), a lower outer mold (62) is fixedly installed above the lower template (52), a core mold (7) is provided inside the lower outer mold (62) and the upper outer mold (61), one end of the core mold (7) is fixedly connected to the frame (3), the upper outer mold (61), the core mold (7) and the lower outer mold (62) are combined to form a mold cavity, and the left injection machine (41) and the right injection machine (42) are connected to both sides of the mold cavity.

4. The method for preparing a socket-connected high-density polyethylene solid-wall pipe according to claim 3, characterized in that, A limiting ring (71) is provided on the side of the core mold (7) near the support frame (2).

5. The method for preparing a socket-connected high-density polyethylene solid-wall pipe according to claim 3, characterized in that, A positioning pin (63) is installed at the connection between the upper outer mold (61) and the lower outer mold (62).

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