Double-heating extrusion device for inner layer of lap welded pipe

Abstract

The utility model discloses a lap welded pipe inner layer double-heating extrusion device, which comprises a mouth mould, a core rod, a feeding seat, a ceramic electric heating pipe and a lead, the feeding seat is arranged on one side of the mouth mould, the center of the core rod is provided with a central hole, the ceramic electric heating pipe is arranged in the central hole of the core rod, the diameter of the ceramic electric heating pipe is smaller than that of the central hole of the core rod, and the lead is arranged in the central hole of the core rod. A wire penetrates through one end, close to the feeding seat, of the central hole of the core rod, one end of the wire is connected with a power lead of the ceramic electric heating tube, and the other end of the wire is connected with a power source. The device is simple in structure and convenient to operate, raw materials are fully heated and plasticized through common heating of the external feeding heating module and the internal ceramic electric heating pipe, and the problems of crystal points and the like caused by incomplete plasticization of the raw materials on the inner wall of the lap welded pipe are solved.

Description

Technical Field

[0001] This utility model relates to the field of lap welded pipe production technology, specifically to a double-heating extrusion device for the inner layer of lap welded pipe. Background Technology

[0002] Currently, during the extrusion of the inner layer of lap-welded pipes (such as aluminum-plastic composite pipes), there are two main problems: firstly, the raw materials are not properly plasticized; secondly, existing lap-welded inner pipe extrusion devices only heat the raw materials through the feeding heating module and then transfer the heat energy to the die mandrel structure during extrusion molding. A significant amount of heat is lost during this process, resulting in incomplete plasticization of the inner wall of the lap-welded pipe. This leads to the formation of crystal points, an uneven inner wall, and noticeable particles during extrusion molding, affecting the aesthetics and quality of the lap-welded pipe. Summary of the Invention

[0003] To address the problems existing in the prior art, this utility model provides a double-heating extrusion device for the inner layer of lap-welded pipes. This device has a simple structure and is easy to operate. It uses an external feeding heating module and an internal ceramic electric heating tube to heat the raw material, thereby fully heating and plasticizing it. This solves the problem of crystal points appearing on the inner wall of lap-welded pipes due to incomplete plasticization of the raw material.

[0004] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0005] A double-heated extrusion device for the inner layer of lap-welded pipe includes a die, a mandrel, and a feed seat. The feed seat is installed on one side of the die. The device also includes a ceramic electric heating tube and a wire. A central hole is opened in the center of the mandrel. The ceramic electric heating tube is placed in the central hole of the mandrel. The diameter of the ceramic electric heating tube is smaller than the diameter of the central hole of the mandrel. The wire passes through the central hole of the mandrel near one end of the feed seat. One end of the wire is connected to the power lead of the ceramic electric heating tube, and the other end of the wire is connected to the power supply.

[0006] It also includes an air inlet pipe and a 45° connector. One end of the 45° connector is detachably connected to the end of the mandrel near the feed seat, and the air inlet pipe is connected to the other end of the 45° connector.

[0007] The mandrel has an internal thread at one end near the feed seat and an external thread at one end of the 45° connector. The mandrel is threadedly connected to the 45° connector.

[0008] The intake pipe is equipped with a T-connector, two of which are connected to the intake pipe, and the other port of the T-connector is sealed. A wire passes through the sealed port of the T-connector.

[0009] The air intake pipe is a flexible hose.

[0010] Compared with the prior art, the beneficial effects and advantages of this utility model are as follows:

[0011] This device uses a high-temperature ceramic electric heating tube added to the mandrel for auxiliary heating, which works together with the feeding heating module. The ceramic electric heating tube can be adjusted to reach the set temperature, which makes the inner layer raw material more fully plasticized, eliminates raw material particles that are not fully plasticized on the inner wall, solves the problem of crystal points on the inner wall of lap-welded pipes, reduces the scrap of lap-welded pipes, and improves production quality. Attached Figure Description

[0012] Fig. 1 This is a schematic diagram of the external structure of the double-heated extrusion device for the inner layer of the lap-welded pipe (the air inlet is not shown).

[0013] Fig. 2 This is a schematic diagram of the internal structure of a double-heated extrusion device for the inner layer of welded pipes.

[0014] Among them, 1-die, 2-core rod, 3-feed seat, 4-first feed port, 5-second feed port, 6-center hole, 7-ceramic electric heating tube, 8-45° connector, 9-air inlet pipe, 10-tee connector, 11-wire. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings.

[0016] The structure of the double-heating extrusion device for the inner layer of the lap-welded pipe provided in this embodiment is as follows: Figs. 1-2 As shown, it includes a die 1, a mandrel 2, a feed seat 3, a ceramic electric heating tube 7, a wire 11, an air inlet pipe 9, and a 45° connector 8.

[0017] The die 1 is fitted onto the mandrel 2, and the feed seat 3 is installed on one side of the die 1. The feed seat 3 is provided with a first feed port 4 and a second feed port 5. The first feed port 4 is used for hot melt adhesive feeding, and the second feed port 5 is used for inner layer raw material feeding.

[0018] The core rod 2 has a central hole 6, and a ceramic electric heating tube 7 is disposed inside the central hole 6 of the core rod. The diameter of the ceramic electric heating tube 7 is smaller than the diameter of the central hole of the core rod 2, forming an air intake channel between the ceramic electric heating tube 7 and the inner wall of the central hole of the core rod 2.

[0019] The mandrel 2 has an internal thread at one end near the feed seat 3, and an external thread at one end of the 45° connector 8. The externally threaded end of the 45° connector 8 is threadedly connected to the end of the mandrel 2 near the feed seat. The function of the 45° connector 8 is to reserve space on one side of the mandrel for installing the forming wheel assembly behind it.

[0020] The air intake pipe 9 is a plastic flexible tube. One end of the air intake pipe 9 is connected to the 45° connector 8, and the other end is connected to the air pump. The air intake pipe 9 is equipped with a T-connector 10. Two of the ports of the T-connector 10 are connected to the air intake pipe 9, and the other port of the T-connector 10 is sealed.

[0021] The wire 11 passes through the sealing interface of the tee connector 10 and the end of the mandrel 2 near the feed seat 3 in the center hole 6. One end of the wire 11 is connected to the power lead of the ceramic electric heating tube 7, and the other end of the wire 11 is connected to the power supply. The ceramic electric heating tube 7 is energized through the wire 11.

[0022] The working method of the above-mentioned double-heated extrusion device for the inner layer of lap-welded pipe is as follows:

[0023] 1. Hot melt adhesive is added to the flow channel between the die 1 and the mandrel 2 through the first feed port 4, and then the hot melt adhesive is extruded and applied to the inner wall of the welded aluminum tube to form a hot melt adhesive layer.

[0024] 2. Power on the ceramic electric heating tube 7 and adjust the voltage to bring it to the set temperature. At the same time, introduce gas at a certain pressure into the center hole 6 of the mandrel 2 through the vent pipe 9. The gas enters the extrusion end of the die 1 through the air inlet channel and then enters the flow channel between the die 1 and the mandrel 2 through the second feed port 5. The inner layer material heated by the feeding heating module is added to the flow channel. The inner layer material is further heated by the ceramic electric heating tube 7 in the flow channel, making the inner layer material more fully plasticized. Then, the inner layer material entering the flow channel is extruded and coated on the hot melt adhesive layer to form an inner plastic layer. The gas with a certain pressure can make the inner plastic layer, the hot melt adhesive layer and the inner wall of the aluminum tube adhere more tightly.

Claims

1. A double-heated extrusion device for the inner layer of lap-welded pipe, comprising a die, a mandrel, and a feed seat, wherein the feed seat is mounted on one side of the die, characterized in that: It also includes a ceramic electric heating tube and a wire. A central hole is opened in the center of the mandrel. The ceramic electric heating tube is placed in the central hole of the mandrel. The diameter of the ceramic electric heating tube is smaller than the diameter of the central hole of the mandrel. The wire passes through the central hole of the mandrel near the end of the feed seat. One end of the wire is connected to the power lead of the ceramic electric heating tube, and the other end of the wire is connected to the power supply.

2. The double-heating extrusion device for the inner layer of lap-welded pipes according to claim 1, characterized in that: It also includes an air inlet pipe and a 45° connector. One end of the 45° connector is detachably connected to the end of the mandrel near the feed seat, and the air inlet pipe is connected to the other end of the 45° connector.

3. The double-heating extrusion device for the inner layer of lap-welded pipes according to claim 2, characterized in that: The mandrel has an internal thread at one end near the feed seat and an external thread at one end of the 45° connector. The mandrel is threadedly connected to the 45° connector.

4. The double-heating extrusion device for the inner layer of lap-welded pipes according to claim 2, characterized in that: The intake pipe is equipped with a T-connector, two of which are connected to the intake pipe, and the other port of the T-connector is sealed. A wire passes through the sealed port of the T-connector.

5. The double-heating extrusion device for the inner layer of lap-welded pipes according to claim 2, characterized in that: The air intake pipe is a flexible hose.

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