Self-coiling pipe forming jig

Abstract

The utility model provides a self-reeling pipe forming jig which solves the technical problems that in the forming process of a self-reeling pipe, the inside and the outside are heated unevenly, deformation is prone to occurring, and products are poor. The self-coiling pipe forming jig comprises a shell and a forming pipe, the forming pipe is located in the shell, an annular gap is defined between the outer wall of the forming pipe and the inner wall of the shell, the annular gap is provided with a feeding port and a discharging port, and the inner diameter of the annular gap is gradually decreased in the direction from the feeding port to the discharging port; a first heating part wraps the shell, a second heating part is arranged in the forming pipe, and the second heating part is arranged in the axial direction of the forming pipe; the first heating part and the second heating part conduct heating on the outer side and the inner side of the annular gap, and it can be guaranteed that the temperatures of the inner layer and the outer layer are kept consistent when the self-coiling pipe is formed. When the temperature of the inner layer and the temperature of the outer layer are kept consistent, the inner layer and the outer layer of the product can be synchronously shrunk, so that the undesirable phenomena of inner folding, bulging and the like of the self-coiling pipe are avoided, and the finished product yield of the thickened self-coiling pipe is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pipe winding forming technical field especially to a self -winding pipe forming jig. BACKGROUND

[0002] In the new energy industry, especially in the field of new energy vehicles, it has developed rapidly in recent years. With the popularization of electric vehicles, higher requirements are put forward for battery safety, charging safety and protection of wiring harness system. Key components such as high-voltage wiring harness and battery pack connecting wire in new energy vehicles need to be effectively protected and warned to ensure the safe operation of the vehicle. Self-winding pipe, as a kind of flexible sleeve, is widely used in the protection of wiring harness system in the automotive industry. They can provide good wear resistance, impact resistance and cutting resistance, so as to protect the wiring harness from the damage of external environment. In new energy vehicles, the application of self-winding pipe is particularly important, because they can protect key components such as high-voltage wiring harness from mechanical damage and heat.

[0003] The self-winding pipe forming jig in the prior art includes a tapered pipe, and the taper is provided with a heating device. The self-winding pipe raw material can be heated and wound to form when passing through the pipe. The self-winding pipe can be opened under external torsion.

[0004] The applicant found that the prior art at least has the following technical problems: However, in order to improve the wear resistance of the self-winding pipe, the wall thickness of the self-winding pipe needs to be appropriately increased in the prior art. When the thickness of the self-winding pipe increases, the distance between the inside of the self-winding pipe and the heating device on the shell is far during forming. The inside of the self-winding pipe will be lower than the outside due to the heat, so that the inside will deform to cause product defects. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a self-winding pipe forming jig to solve the technical problems of uneven heating inside and outside during the forming process of the self-winding pipe in the prior art, which is prone to deformation and causes product defects. The preferred technical solutions in many technical solutions provided by the utility model can produce many technical effects, which are described in detail below.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0007] The self-winding pipe forming jig provided by the utility model comprises an outer shell and a forming pipe, wherein:

[0008] The forming pipe is located in the outer shell, and an annular gap is formed between the outer wall of the forming pipe and the inner wall of the outer shell. The annular gap has an inlet and an outlet, and the inner diameter of the annular gap gradually decreases from the inlet to the outlet.

[0009] The first heating part is wrapped on the shell, and the second heating part is arranged in the forming pipe and arranged along the axial direction of the forming pipe.

[0010] Preferably, the forming pipe is provided with an axial cavity penetrating through opposite ends of the forming pipe, and the second heating part is positioned in the axial cavity.

[0011] Preferably, the shell has a first inner cavity penetrating through opposite ends of the shell, the first inner cavity is a tapered cavity, the forming pipe is located in the first inner cavity and surrounds the annular gap with the cavity wall of the first inner cavity.

[0012] Preferably, the diameter of the first inner cavity gradually decreases in the direction from the feeding port to the discharging port.

[0013] Preferably, the forming pipe is a tapered pipe, and the tapered pipe is located in the first inner cavity and surrounds the annular gap.

[0014] Preferably, the outer diameter of the tapered pipe gradually decreases in the direction from the feeding port to the discharging port.

[0015] Preferably, the first heating part is wrapped on the outer wall of the shell by 360 degrees.

[0016] Preferably, the second heating part comprises a heating pipe or a heating rod or a heating wire.

[0017] The second heating part is coaxially arranged with the shell, the forming pipe and the annular gap.

[0018] Preferably, the shell comprises a first half shell and a second half shell, wherein:

[0019] The first half shell and the second half shell have a splicing surface capable of being spliced with each other, the splicing surface is arranged along the axial direction of the shell, and the first half shell and the second half shell are detachably connected.

[0020] Preferably, the forming pipe is provided with a positioning cavity, and a temperature sensing device is fixed in the positioning cavity.

[0021] The self-winding pipe forming jig further comprises a temperature control unit electrically connected with the temperature sensing device, the first heating part and the second heating part, and used for controlling the heating time of the first heating part and the second heating part according to the temperature information of the temperature sensing device.

[0022] Compared with the prior art, the self-winding pipe forming jig has the following beneficial effects:

[0023] The forming pipe and the shell are independently arranged, the annular gap for the raw material to pass through is surrounded by the forming pipe and the shell, the first heating part and the second heating part heat at the outer side and the inner side of the annular gap, and the temperature of the inner and outer layers of the self-volting pipe can be kept consistent during the forming. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is an axial cross-sectional view of the self-volting pipe forming jig;

[0026] Figure 2 is an exploded structural view of the self-volting pipe forming jig;

[0027] Figure 3 is an axial view of the self-volting pipe forming jig.

[0028] In the figure, 1 is a shell, 101 is a first inner cavity, 11 is a first half shell, 12 is a second half shell, 13 is a splicing surface, 2 is a forming pipe, 3 is an annular gap, 31 is an inlet, 32 is an outlet, 4 is a shaft cavity, 5 is a positioning cavity, 6 is a second heating part, and 7 is a temperature sensing device. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of the present application.

[0030] In the description of this utility model, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] This utility model provides a self-winding tube forming fixture, which ensures uniform heating of the material inside and out, thereby avoiding defects such as inner folding and bulging in the self-winding tube and greatly improving the yield of thickened self-winding tubes.

[0033] The following is combined with Figures 1-3 The technical solution provided by this utility model will be described in more detail.

[0034] like Figures 1-3 As shown, the self-winding tube forming fixture provided by this utility model includes a shell 1 and a forming tube 2, wherein: the forming tube 2 is located inside the shell 1, and an annular gap 3 is formed between the outer wall of the forming tube 2 and the inner wall of the shell 1. The annular gap 3 has a feed inlet 31 and a discharge outlet 32, and the inner diameter of the annular gap 3 gradually decreases along the direction from the feed inlet 31 to the discharge outlet 32; a first heating part is covered on the shell 1, and a second heating part 6 is provided inside the forming tube 2. The second heating part 6 is arranged along the axial direction of the forming tube 2.

[0035] The annular gap 3 has a conical cavity structure with a large inlet diameter 31 and a small outlet diameter 32. The self-winding tube forming fixture operates on the principle of heating and forming within the conical cavity. This is achieved through a combination of geometric constraints and thermal drive, utilizing the gradual change in the annular gap 3 to guide the material to curl in a specific direction after heating, ultimately forming a tube. The annular gap 3 provides gradual curvature guidance, controlling the starting point and direction of material curling; the conical structure of the annular gap 3 constrains and limits lateral deformation of the material, promoting axial bending; and it adjusts the final tube diameter (the larger the taper, the smaller the tube diameter).

[0036] The material within the annular gap 3 is uniformly heated to its critical temperature (such as the glass transition temperature or thermal expansion threshold) through the first heating section and the second heating section 6. The thermal response mechanism is as follows: For the bimaterial layer: after being heated, the difference in expansion between materials with different coefficients of thermal expansion generates a bending moment (similar to the bimetallic strip effect); pre-strain release: heating softens the elastic substrate, and the pre-stretched layer shrinks, driving curling; shape memory material: after being heated, it recovers the preset tubular memory shape.

[0037] The self-winding tube forming fixture in this embodiment adopts an internal annular gap 3 conical structure to ensure temperature stability while reducing heat loss.

[0038] In this embodiment, the self-winding tube forming fixture has the forming tube 2 and the outer shell 1 independently configured, forming an annular gap 3 for the raw material to pass through. The first heating part and the second heating part 6 heat the outer and inner sides of the annular gap 3, respectively, ensuring that the inner and outer layers of the self-winding tube maintain a consistent temperature during forming. When the inner and outer layers maintain a consistent temperature, the inner and outer layers of the product will shrink synchronously, thereby avoiding defects such as inward folding and bulging of the sheath, and greatly improving the yield of the thickened self-winding tube.

[0039] The outer shell 1 is a tubular structure, and the first heating element is evenly arranged inside the outer shell 1, or the first heating element is wrapped around the outer wall of the outer shell 1 to ensure uniform heating.

[0040] As an optional implementation, see Figures 1-3 As shown, a shaft cavity 4 is provided inside the forming tube 2, and the shaft cavity 4 passes through the opposite ends of the forming tube 2. The second heating part 6 is positioned inside the shaft cavity 4.

[0041] The second heating part 6 includes a heating tube, heating rod, or heating wire. The second heating part 6 is positioned in the shaft cavity 4, which can ensure uniform heating in the forming tube 2, thereby uniformly heating the self-winding tube passing through the annular gap 3.

[0042] Preferably, the first heating section and the second heating section 6 employ gradient composite heating, meaning the heating layer of the first heating section is composed of multiple layers of thermally conductive materials stacked together, thereby reducing energy consumption and improving the uniformity of heating the self-winding tube mold. Furthermore, an aerogel insulation layer is applied to the outer layer of the mold. Generally, using gradient composite heating and aerogel insulation can reduce energy consumption by 20% and improve heating uniformity by 40%.

[0043] The shaft cavity 4 extends through the opposite ends of the forming tube 2, which can effectively drain the internal oil and water stains and avoid leaving dirt on the product.

[0044] As an optional implementation, see Figure 1 and Figure 2As shown, the outer shell 1 has a first inner cavity 101, which extends through the opposite ends of the outer shell 1. The first inner cavity 101 is a conical cavity. The forming tube 2 is located in the first inner cavity 101 and forms an annular gap 3 with the cavity wall of the first inner cavity 101.

[0045] The first inner cavity 101 is a conical cavity. Specifically, the diameter of the first inner cavity 101 gradually decreases along the direction from the inlet 31 to the outlet 32. This facilitates the fitting with the outer wall of the forming tube 2 to form a conical annular gap 3.

[0046] The first inner cavity 101 extends through the opposite ends of the outer shell 1, and can effectively drain the internal oil and water stains through the shaft cavity 4, avoiding the residue of dirt on the product.

[0047] As an optional implementation, see Figure 1 and Figure 2 As shown, the forming tube 2 is a tapered tube, which is located in the first inner cavity 101 and surrounds an annular gap 3. The outer diameter of the tapered tube gradually decreases along the direction from the feed inlet 31 to the discharge outlet 32.

[0048] The forming tube 2 also has a tapered tube structure. The outer wall of the forming tube 2 fits with the inner cavity of the first inner cavity 101 to form an annular gap 3. The diameter of the annular gap 3 gradually decreases along the direction from the feed inlet 31 to the discharge outlet 32, which facilitates the forming of the self-winding tube.

[0049] As an optional implementation, the second heating part 6 is arranged coaxially with the outer shell 1, the forming tube 2, and the annular gap 3.

[0050] The above structure facilitates the uniform heating of the material within the annular gap 3 by the first heating section and the second heating section 6, preventing uneven heating inside and outside the self-winding tube and improving the product quality of the self-winding tube.

[0051] As an optional implementation, see Figure 2 As shown, the outer shell 1 includes a first half shell 11 and a second half shell 12, wherein: the first half shell 11 and the second half shell 12 have splicing surfaces 13 that can be spliced ​​together, the splicing surfaces 13 are arranged along the axial direction of the outer shell 1, and the first half shell 11 and the second half shell 12 are detachably connected.

[0052] After the first half-shell 11 and the second half-shell 12 are joined together, they can be locked with screws, etc., which facilitates the disassembly and assembly of components such as the molding tube 2 and the second heating part 6 inside the outer shell 1, and makes it easy to clean and maintain the inside of the outer shell 1, and is convenient to use.

[0053] Furthermore, a nano-coating is applied to the inner walls of the first half-shell 11 and the second half-shell 12, thereby reducing the adhesion between the mold and the first and second half-shells 11 and 12, thus achieving rapid demolding and improving the yield of self-winding tube molding. Actual calculations show that after adopting the nano-coating, the demolding time is shortened by 50%, and the mold molding yield is increased to 98%.

[0054] The nano-coating materials used to coat the inner wall of mold forming fixtures mainly include metal-ceramic nano-coatings, ceramic nano-coatings, and composite nano-coatings.

[0055] Metal-ceramic nanocoatings include:

[0056] Titanium nitride (TiN) coatings possess high hardness and excellent wear resistance, with a smooth surface that effectively reduces friction. In mold forming fixtures, TiN coatings can improve the wear resistance and service life of the molds.

[0057] TiAlN and AlTiN coatings are available. TiAlN coatings form an alumina layer during processing, which improves high-temperature processing life. AlTiN coatings offer higher resistance to high-temperature oxidation, making them suitable for molds used in high-temperature environments.

[0058] Chromium nitride (CrN) coating has good anti-adhesion, corrosion resistance and wear resistance, and is suitable for processing molds of materials such as aluminum alloy and red copper. It can prevent materials from adhering to the mold surface.

[0059] Diamond-like carbon (DLC) coatings have a low coefficient of friction, high wear resistance and good chemical stability, making them suitable for forming dies and stamping dies for materials with strong adhesion, such as aluminum alloys.

[0060] Ceramic nano-coatings include:

[0061] Zirconia (ZrO2) coating: It has good thermal stability, high temperature resistance, corrosion resistance and wear resistance, and is suitable for molds that require high temperature oxidation protection.

[0062] Nanodiamond composite coating: Using cemented carbide as the substrate, a composite coating of traditional diamond and nanodiamond is applied to the inner surface of the mold using chemical vapor deposition (CVD), which has extremely high hardness and wear resistance.

[0063] Composite nano-coatings include:

[0064] Metal / nanodiamond coating: A small amount of nanodiamond is added to the coating and sprayed onto the mold surface to improve wear resistance and scratch resistance.

[0065] Nano-oxide composite coatings, such as nano-zirconia and nano-titanium oxide composite coatings, have excellent optical and mechanical properties.

[0066] As an optional implementation, see Figure 1 and Figure 2 As shown, the forming tube 2 is provided with a positioning cavity 5, and a temperature sensing device 7 is fixed inside the positioning cavity 5; the self-winding tube forming fixture also includes a temperature control unit, which is electrically connected to the temperature sensing device 7, the first heating part and the second heating part 6, and is used to control the heating time of the first heating part and the second heating part 6 according to the temperature information of the temperature sensing device 7.

[0067] The temperature sensing device 7 can be a linear structure. It is fixed inside the positioning cavity 5 and is used to detect the temperature of the forming tube 2, thereby detecting the inner wall temperature of the self-winding tube. The temperature control unit controls the heating duration of the first heating part and the second heating part 6 based on the temperature information from the temperature sensing device 7, with the aim of making the inner and outer wall temperatures of the self-winding tube consistent.

[0068] By using the temperature information fed back from the temperature sensing device 7, the first heating part and the second heating part 6 can be heated more accurately and synchronously, thus completely solving the problems of folding and bulging inside the self-winding tube.

[0069] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A self-rolling tube forming jig, characterized by, The self-winding pipe forming jig comprises a shell and a forming pipe, wherein: the forming pipe is located in the shell, an annular gap is formed between the outer wall of the forming pipe and the inner wall of the shell, the annular gap has an inlet and an outlet, and the inner diameter of the annular gap gradually decreases in the direction from the inlet to the outlet; the shell is coated with a first heating part, and the forming pipe is provided with a second heating part arranged along the axial direction of the forming pipe.

2. The self-rolling tube forming jig according to claim 1, characterized by The forming pipe is provided with a shaft cavity, the shaft cavity penetrates through the opposite ends of the forming pipe, and the second heating part is located in the shaft cavity.

3. The self-rolling tube forming jig according to claim 1, wherein The shell has a first inner cavity, the first inner cavity penetrates through the opposite ends of the shell, the first inner cavity is a tapered cavity, the forming pipe is located in the first inner cavity, and the forming pipe and the cavity wall of the first inner cavity form the annular gap.

4. The self-rolling tube forming jig according to claim 3, wherein The diameter of the first inner cavity gradually decreases in the direction from the inlet to the outlet.

5. The self-rolling tube forming jig according to claim 3, wherein The forming pipe is a tapered pipe, the tapered pipe is located in the first inner cavity, and the tapered pipe forms the annular gap.

6. The self-rolling tube forming jig according to claim 5, wherein The outer diameter of the tapered pipe gradually decreases in the direction from the inlet to the outlet.

7. The self-rolling tube forming jig according to claim 1, wherein The first heating part is 360° coated on the outer wall of the shell.

8. The self-rolling tube forming jig according to claim 1, wherein The second heating part comprises a heating pipe or a heating rod or a heating wire. The second heating part is coaxially arranged with the shell, the forming pipe and the annular gap.

9. The self-rolling tube forming jig according to claim 1, wherein The shell comprises a first half shell and a second half shell, wherein: the first half shell and the second half shell have a splicing surface capable of being spliced with each other, the splicing surface is arranged along the axial direction of the shell, and the first half shell and the second half shell are detachably connected.

10. The self-rolling tube forming jig according to claim 1, wherein The forming pipe is provided with a positioning cavity, and a temperature sensing device is fixed in the positioning cavity; The self-winding pipe forming jig further comprises a temperature control unit, the temperature control unit is electrically connected with the temperature sensing device, the first heating part and the second heating part, and is used for controlling the heating time of the first heating part and the second heating part according to the temperature information of the temperature sensing device.

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