A double wall corrugated pipe heating flaring device

Abstract

The utility model discloses a double -walled bellows heating flaring device, including heating module, flaring device and auxiliary support frame, and the device is through the size adaptation of outer heating block attachment structure and inner heating block, realizes the even heating of double -walled bellows and flares portion, guarantees flaring basic stability. The fluid passage of flaring device cooperates with hot and cold water switch, can conveniently complete the alternate passage of hot and cold water, realizes the integration of flaring plastic forming and cooling and sets, and improves processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of double-wall corrugated pipe technology, and in particular to a heating and flaring device for double-wall corrugated pipe. Background Technology

[0002] Double-wall corrugated pipes are widely used in municipal drainage, chemical sewage discharge, and building drainage due to their advantages such as light weight, corrosion resistance, and convenient construction. In the practical application of double-wall corrugated pipes, flaring and pipe connection are key steps that directly affect the sealing performance, stability, and service life of the pipeline system.

[0003] Existing double-wall corrugated pipe flaring technology has several drawbacks. Firstly, the heating module design is flawed. External heating devices are often planar structures, resulting in poor contact with the corrugated surface of the pipe, leading to uneven heating and localized insufficient or excessive softening of the pipe material, affecting the accuracy of the flaring dimensions. Conversely, the large gap between the internal heating device and the inner wall of the pipe results in low heating efficiency for the inner wall, further exacerbating the instability of the flaring quality. Secondly, the post-flaring shaping method is simplistic, relying heavily on natural cooling, which results in slow shaping speed, low production efficiency, and a tendency for pipe springback during cooling, leading to irregular flaring shapes. Utility Model Content

[0004] The purpose of this invention is to provide a double-walled corrugated pipe heating and flaring device to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A heating and flaring device for a double-wall corrugated pipe includes a heating module, a flaring device, and an auxiliary support frame. The heating module includes an outer heating block and an inner heating block. The inner wall of the outer heating block is a corrugated structure adapted to the corrugation of the outer wall of the double-wall corrugated pipe. The outer diameter of the inner heating block matches the inner diameter of the double-wall corrugated pipe. The heating module is used to heat the part of the double-wall corrugated pipe to be flared.

[0007] The flaring device is an annular hollow water jacket. The interior of the hollow water jacket is provided with an annular cavity that can switch between cold water and hot water. The flaring device is used to flare, shape, and cool the double-walled corrugated pipe after it has been heated by the heating module.

[0008] The auxiliary support frame is used to support and position the double-walled corrugated pipe and the hollow water jacket during operation.

[0009] Furthermore, the outer heating block is a semi-circular ring, the inner heating block is a ring, and there are at least two outer heating blocks. The outer heating blocks are combined and arranged coaxially with the inner heating blocks.

[0010] Furthermore, both the external heating block and the internal heating block are made of stainless steel.

[0011] Furthermore, the hollow water jacket is made of stainless steel.

[0012] Furthermore, the hollow water jacket is equipped with a hot and cold water switching switch, which is connected to the annular cavity.

[0013] Furthermore, the hollow water jacket is connected to a cold water pipe and a hot water pipe, both of which are connected to the hollow water jacket via a hot and cold water switching switch.

[0014] Furthermore, the hollow water jacket is also connected to a drain pipe, which is connected to the hollow water jacket via a hot and cold water switching switch.

[0015] Beneficial effects:

[0016] This device achieves uniform heating of the double-walled corrugated pipe's flaring section through an external heating block fitting structure that adapts to the size of the internal heating block, ensuring the stability of the flaring foundation. The fluid channel of the flaring device, in conjunction with a hot and cold water switching switch, allows for convenient alternating flow of hot and cold water, integrating flaring shaping and cooling / settling into a single process, thus improving processing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the heating module structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the flaring device of this utility model.

[0019] The following are the labels in the diagram: 1. External heating block; 2. Internal heating block; 3. Conductor coil; 4. Live wire; 5. Neutral wire; 6. Temperature control thermocouple wire; 7. Double-wall corrugated pipe; 8. Flaring device; 9. Hot and cold switching switch; 10. Hot water pipe; 11. Cold water pipe; 12. Drain pipe; 13. Positioning pin; 14. Bracket 1; 15. Bracket 2; 16. Bracket 3; 17. Flaring section; 18. Limiting section. Detailed Implementation

[0020] In the description of this embodiment, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model. In addition, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Furthermore, unless otherwise specified, the components used in the following embodiments are all existing components, and their corresponding connection methods can also be implemented by conventional technical means. They will not be described in detail in this application.

[0021] Example

[0022] This embodiment provides a heating and flaring device for a double-walled corrugated pipe 7, such as... Figure 1 and Figure 2 As shown, it includes a heating module, a flaring device 8, and an auxiliary support frame, wherein the auxiliary support frame includes bracket 14, bracket 2 15, and bracket 3 16.

[0023] Specifically, the heating module is used to uniformly and rapidly heat and soften the end of the double-walled corrugated pipe 7 to be flared, and includes an outer heating block 1 and an inner heating block 2. The outer heating block 1 is a semi-circular ring, and at least two blocks can be combined to form a complete ring. The two outer heating blocks 1 respectively surround the upper and lower parts of the double-walled corrugated pipe 7. The inner wall of the outer heating block 1 has a corrugated structure adapted to the corrugation of the outer wall of the double-walled corrugated pipe 7, thus allowing it to fit snugly against the outer wall of the double-walled corrugated pipe 7 to ensure good contact and heating. The outer diameter of the inner heating block 2 matches the inner diameter of the double-walled corrugated pipe 7. The inner heating block 2 is annular and can be inserted into the double-walled corrugated pipe 7 and fit snugly against its inner wall. The combined outer heating blocks 1 and inner heating blocks 2 are coaxially arranged to jointly form the clamping and heating area for the double-walled corrugated pipe 7. Both the external heating block 1 and the internal heating block 2 are equipped with wire coils 3, specifically including a live wire 4 and a neutral wire 5. This allows for the rapid heating of the external heating block 1 and the internal heating block 2 to the required process temperature using the eddy current heating effect of alternating current, thus enabling the heating module to heat the flared portion of the double-walled corrugated pipe 7. Thermocouples are also installed inside both the external heating block 1 and the internal heating block 2. These thermocouples are connected to temperature-controlled thermocouple wires 6, which are connected to a temperature controller, forming a temperature control system. Therefore, precise temperature control of the external heating block 1 and the internal heating block 2 can be achieved through the thermocouples, ensuring uniform heating.

[0024] After the heating module heats the end of the double-walled corrugated pipe 7 to be flared, the flaring device 8 flares and shapes the softened pipe end and rapidly cools it to set its shape. Specifically, the flaring device 8 is a ring-shaped stainless steel hollow water jacket. The front end of the hollow water jacket is a conical flaring section 17, which guides and gradually expands the softened pipe end. The rear end of the hollow water jacket is a limiting section 18 to determine the final size of the flare. The hollow water jacket has an annular cavity inside that allows switching between cold and hot water. The hollow water jacket is equipped with a hot and cold water switching switch 9, which can be a multi-channel valve core type switching valve or other structures that can switch channels.

[0025] A hot and cold water switch is connected to the annular cavity, while a hollow water jacket connects to a cold water pipe 11, a hot water pipe 10, and a drain pipe 12. All three pipes are connected to the hollow water jacket via the hot and cold water switch. Therefore, the heating and cooling of the annular cavity can be controlled via the hot and cold water switch. During the flaring process, hot water is introduced to ensure smooth flaring; upon completion, the flow switches to cold water to rapidly cool and solidify the flared section. The dimensions of the hollow water jacket can be determined based on the required flaring dimensions of the pipe and the shrinkage rate.

[0026] Preferably, the external heating block 1, the internal heating block 2, and the hollow water jacket are all made of stainless steel. Stainless steel is resistant to high temperature and corrosion, and can withstand high working temperature and alternating hot and cold water impacts, avoiding rust or material aging, thereby extending its service life.

[0027] Workflow:

[0028] Heating stage: Place the end of the double-walled corrugated pipe 7 to be flared into the open heating module, close the outer heating block 1, and insert the inner heating block 2. Set the heating temperature (e.g., 120℃~140℃), start heating, and maintain the temperature for 3~5 minutes to allow the pipe end to soften fully and evenly. During heating, the double-walled corrugated pipe 7 is placed on the support bracket 316.

[0029] Transfer and preheating water jacket: During the heating stage, hot water (e.g., 80℃~100℃) is introduced into the annular cavity of the hollow water jacket through the hot and cold water switching switch 9 for preheating to prevent the plastic surface from cooling suddenly due to contact with the cold mold.

[0030] Flaring and Shaping Stage: Turn on the heating module, quickly remove the softened pipe, and align its end with the conical flaring section 17 of the preheated hollow water jacket. Slowly push the pipe into the water jacket axially, and the softened pipe end gradually expands under the guidance of the conical surface until it is fully inserted into the cylindrical shaping section. During the flaring process, the double-walled corrugated pipe 7 is placed on the second support 15, and a positioning pin 13 is provided on the second support 15 to fix the position of the double-walled corrugated pipe 7. The flaring device 8 is snapped onto the first support 14. The specific snapping method can be a threaded connection or other detachable connection method that allows the flaring device 8 to be placed horizontally.

[0031] Cooling and shaping stage: Once the pipe end reaches the designated position, operate the hot and cold water switching valve 9 to immediately switch the hot water in the annular cavity to cold water. The cold water circulation quickly removes heat, allowing the expanded plastic to set. After maintaining cooling for 3-5 minutes, remove the pipe from the hollow water jacket, resulting in a flared end with accurate dimensions and a stable shape.

[0032] Application examples of products processed by this device:

[0033] The flared end of the double-wall corrugated pipe 7, processed using the device in this embodiment, can achieve a high-quality socket connection with the corresponding spigot end. Specifically, the outer wall of the spigot end can be designed with multiple annular grooves. During connection, a sealing element (such as a rubber ring or sealant) can be placed on the inner wall of the flared end or in the groove of the spigot end. When the spigot end is inserted into the flared end, the groove structure can effectively prevent the sealing element from axial movement, thereby significantly improving the sealing reliability and long-term stability of the interface. The flared end prepared by this device has precise dimensions and regular shape, which can ensure a tight fit with the spigot end, further reducing the risk of interface leakage.

[0034] Although the embodiments of this utility model have been described in the specification, these embodiments are merely illustrative and should not limit the scope of protection of this utility model. Various omissions, substitutions, and modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A heating and flaring device for double-walled corrugated pipes, characterized in that: The device includes a heating module, a flaring device, and an auxiliary support frame. The heating module includes an outer heating block and an inner heating block. The inner wall of the outer heating block is a corrugated structure adapted to the corrugation of the outer wall of the double-wall corrugated pipe. The outer diameter of the inner heating block matches the inner diameter of the double-wall corrugated pipe. The heating module is used to heat the part of the double-wall corrugated pipe to be flared. The flaring device is an annular hollow water jacket. The interior of the hollow water jacket is provided with an annular cavity that can switch between cold water and hot water. The flaring device is used to flare, shape, and cool the double-walled corrugated pipe after it has been heated by the heating module. The auxiliary support frame is used to support and position the double-walled corrugated pipe and the hollow water jacket during operation.

2. The double-walled corrugated pipe heating and flaring device according to claim 1, characterized in that: The outer heating block is a semi-circular ring, the inner heating block is a ring, and there are at least two outer heating blocks. The outer heating blocks are combined and arranged coaxially with the inner heating blocks.

3. The double-walled corrugated pipe heating and flaring device according to claim 1, characterized in that: Both the external heating block and the internal heating block are made of stainless steel.

4. The double-walled corrugated pipe heating and flaring device according to claim 1, characterized in that: The hollow water jacket is made of stainless steel.

5. The double-wall corrugated pipe heating and flaring device according to claim 1, characterized in that: The hollow water jacket is equipped with a hot and cold water switching switch, which is connected to the annular cavity.

6. The double-walled corrugated pipe heating and flaring device according to claim 5, characterized in that: The hollow water jacket is connected to a cold water pipe and a hot water pipe, and both the cold water pipe and the hot water pipe are connected to the hollow water jacket through a hot and cold water switching switch.

7. The double-walled corrugated pipe heating and flaring device according to claim 5, characterized in that: The hollow water jacket is also connected to a drain pipe, which is connected to the hollow water jacket via a hot and cold water switching switch.

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