Method for heat shrinking a wiring harness with a heat shrink tube

Abstract

The application discloses a kind of harness and heat shrink tube heat shrink forming method comprising the following steps: S1: heat shrink tube is sleeved on harness;S2: the top and bottom of the harness and the heat shrink tube form the constant temperature vortex hot air flow of opposite arrangement;S3: control the hot air flow of top and bottom and blow to the heat shrink tube, the hot air flow of top and bottom and the harness have certain angle of inclination;S4: blow to the heat shrink tube and the hot air flow between entering the harness and heat shrink tube automatically fill into the inner wall of the heat shrink tube while also acting on the outer wall of the heat shrink tube, inside and outside simultaneously synchronous heating so that the heat shrink tube heat shrink on the harness;S5: the heat shrink tube is heat shrink formed on the harness, take out finished product;The application can solve the current heating mode of heat shrink tube is that heat shrink tube outer surface is heated, cannot make hot air flow uniform and automatically penetrate to heat shrink tube inner wall, which leads to heat shrink efficiency and heat shrink quality of heat shrink tube cannot be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of wire harness processing technology, specifically to a method for heat shrinking high-voltage wire harnesses and heat shrink tubing for new energy vehicles. Background Technology

[0002] Currently, in automotive wiring harness production, heat shrink tubing is typically wrapped around the terminals and mating parts of the wiring harness. By heating the heat shrink tubing, it shrinks and completely adheres to the surface of the wiring harness. The devices used for heat shrinking the heat shrink tubing are generally heat guns, ceramic infrared heat shrink machines, or infrared light wave heat shrink machines. However, all three of these methods of heating the heat shrink tubing only heat the outer surface of the tubing and cannot allow the hot airflow to penetrate evenly and automatically to the inner wall of the heat shrink tubing. This results in the heat shrinking efficiency and heat shrinking quality not being guaranteed. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the present invention aims to provide a method for heat shrink forming of wire harnesses and heat shrink tubing.

[0004] To achieve the above objectives, the present invention includes the following steps:

[0005] S1: Slide the heat shrink tubing onto the wire harness;

[0006] S2: An opposing constant-temperature vortex hot airflow is formed at the top and bottom of the wire harness and the heat shrink tubing;

[0007] S3: Control the hot airflow at the top and bottom to blow towards the heat shrink tubing, and the hot airflow at the top and bottom has a certain angle with the wire harness;

[0008] S4: The hot airflow blowing towards the heat shrink tubing and entering between the wire harness and the heat shrink tubing automatically enters the inner wall of the heat shrink tubing and also acts on the outer wall of the heat shrink tubing. The inside and outside are heated simultaneously, causing the heat shrink tubing to shrink onto the wire harness.

[0009] S5: The heat shrink tubing is heat-shrinked onto the wire harness and the finished product is removed.

[0010] In the preferred embodiment of the above heat shrink molding method, in S2, the temperature of the hot air flow is 200-400℃.

[0011] In the preferred embodiment of the above-mentioned heat shrink molding method, the temperature accuracy of the hot airflow is ±5℃.

[0012] In the preferred embodiment of the above heat shrink molding method, in S3, the hot airflow at the top and bottom has the same angle with the wire harness.

[0013] In the preferred embodiment of the above-mentioned heat shrink molding method, the angle between the hot air flow and the wire harness is 10-30°.

[0014] In the preferred embodiment of the above heat shrink molding method, in step S4, the heating time of the heat shrink tube is 10-25 seconds.

[0015] In the preferred embodiment of the above heat shrink molding method, in step S5, the hot airflow remains constant after the wire harness is removed.

[0016] The beneficial effect of this invention is that by setting the vortex hot airflow to have a certain inclination angle, the vortex hot airflow can blow towards the outer wall of the heat shrink tubing and enter between the heat shrink tubing and the wire harness through one end of the heat shrink tubing, thereby achieving simultaneous heating of the inner and outer walls of the heat shrink tubing. This greatly improves the efficiency of heat shrinking the heat shrink tubing onto the wire harness, ensuring that the heat shrink tubing completes catalytic heat shrinking within a safe heating time, thus avoiding damage to the sensors in the wire harness during heat shrinking. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a heat shrink apparatus;

[0018] Figure 2 This is a schematic diagram of a vortex channel;

[0019] Figure 3 This is a schematic diagram of the wire harness and heat shrink tubing of the present invention;

[0020] Figure 4 This is a flowchart illustrating the heat shrinking process of the heat shrink tubing of the present invention.

[0021] In the picture:

[0022] Housing 1, first airflow channel 11, second airflow channel 12, upper air outlet 13, lower air outlet 14, airflow channel 15, air inlet 16, vortex channel 17;

[0023] Heating component 2;

[0024] Heat shrink tubing 3;

[0025] Wire harness 4. Detailed Implementation

[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0027] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] See appendix Figure 1-2 As shown, a heat shrinking device includes a housing 1, a blower, and a heating assembly 2. The housing 1 has an internal cavity, forming a first airflow channel 1511 and a second airflow channel 1512 that are interconnected. The first airflow channel 1511 and the second airflow channel 1512 are respectively disposed at the upper and lower parts of the housing 1. The first airflow channel 1511 connects to the outside of the housing 1 through an upper air outlet 13, and the second airflow channel 1512 connects to the outside of the housing 1 through a lower air outlet 14. The upper air outlet 13 and the lower air outlet 14 are perpendicular to each other on the housing 1. The upper air outlet 13 and the lower air outlet 14 form an airflow channel 15 on the housing 1. The airflow channel 15 is used to place the wire harness 4 and heat shrink tubing 3 to be processed. An air inlet 16 is provided on the back of the housing 1. A vortex channel 17 is provided at the air inlet 16. The air inlet 16 is connected to the first airflow channel 1511 and the second airflow channel 1512 through the vortex channel 17. A blower is installed on the air inlet 16. Heating components 2 are evenly arranged on the housing 1 in the first airflow channel 1511 and the second airflow channel 1512. The heating components 2 are composed of multiple heating tubes.

[0030] like Figures 3 to 4 As shown, a method for heat-shrinking wire harnesses and heat-shrink tubing according to the present invention includes the following steps:

[0031] S1: Fit the heat shrink tubing 3 onto the wire harness 4;

[0032] S2: Opposite constant temperature vortex hot airflow is formed at the top and bottom of the wire harness 4 and the heat shrink tubing 3;

[0033] S3: Control the hot airflow at the top and bottom to blow towards the heat shrink tube 3, and the hot airflow at the top and bottom has a certain angle with the wire harness 4;

[0034] S4: The hot airflow blowing towards the heat shrink tube 3 and entering between the wire harness 4 and the heat shrink tube 3 automatically enters the inner wall of the heat shrink tube 3 and also acts on the outer wall of the heat shrink tube 3. The inside and outside are heated simultaneously, so that the heat shrink tube 3 is heat-shrinked onto the wire harness 4.

[0035] S5: The heat shrink tubing 3 is heat-shrinked onto the wire harness 4 and the finished product is removed.

[0036] The heat shrinking of the high-voltage wiring harness 4 in new energy vehicles requires not only stable temperature, but also a certain level of efficiency. That is, the catalytic heat shrinking of the heat shrink tube 3 must be completed within a safe heating time to avoid damage to the sensors in the wiring harness 4 during the heat shrinking of the heat shrink tube 3.

[0037] To ensure that the sensors built into the wire harness 4 entering the heat-shrinkable area are not damaged after the heat-shrinkable tube 3 is heat-shrinked, this application sets the vortex hot airflow with a certain angle, so that the vortex hot airflow can blow towards the outer wall of the heat-shrinkable tube 3 and enter between the heat-shrinkable tube 3 and the wire harness 4 through one end of the heat-shrinkable tube 3, thereby achieving simultaneous heating of the inner and outer walls of the heat-shrinkable tube 3. This greatly improves the efficiency of the heat-shrinkable tube 3 on the wire harness 4 and ensures that the heat-shrinkable tube 3 completes catalytic heat shrinking within a safe heating time, thereby achieving the above-mentioned objective.

[0038] In one or more embodiments, in S2, the temperature of the hot airflow is 200-400°C. The temperature of the hot airflow depends on the actual production conditions. Since the wire harness 4 processed in this application belongs to the high-voltage wire harness 4 of new energy vehicles, it is necessary to heat the hot airflow to a higher temperature to meet production needs.

[0039] In one or more embodiments, the temperature accuracy of the hot airflow is ±5°C. By controlling the temperature accuracy of the hot airflow within ±5°C, the heat shrinkability of the heat shrink tubing 3 can be effectively guaranteed.

[0040] In one or more embodiments, in S3, the hot airflow at the top and bottom has the same angle of inclination with the wire harness 4. This arrangement avoids turbulence when the hot airflows blown out through the upper air outlet 13 and the lower air outlet 14 converge, thereby ensuring the environment when the heat shrink tubing 3 is heated, reducing the possibility of displacement of the heat shrink tubing 3 on the wire harness 4, and improving the processing effect of the wire harness 4 in this application.

[0041] In one or more embodiments, the angle between the hot airflow and the wire harness 4 is 10-30°. The selection of the angle between the top hot airflow and the wire harness 4 and the angle between the bottom hot airflow and the wire harness 4 is based on the diameter of the heat shrink tubing 3 and the amount of hot airflow that needs to enter between the heat shrink tubing 3 and the wire harness 4.

[0042] In one or more embodiments, in S4, the heat shrink tubing 3 is heated for 10-25 seconds. Accordingly, the heating time is shorter for heat shrink tubing 3 with a softer texture, typically 10 seconds.

[0043] In one or more embodiments, in step S5, the hot airflow remains constant after the wire harness 4 is removed. This arrangement maintains a stable hot airflow temperature, ensuring the quality of the heat shrink tubing 3.

[0044] The specific implementation of the heat-shrink forming method for wire harnesses and heat-shrink tubing in this application, within a heat-shrinking apparatus, is as follows:

[0045] First, see Figure 1 , Figure 2 The blower and heating component 2 are controlled to work. The airflow blown by the blower enters the first airflow channel 1511 and the second airflow channel 1512 through the vortex channel 17. Under the action of the heating component 2, the vortex airflow is heated to 200-400℃. It should be noted that the specific heating temperature depends on the properties of the heat shrink tubing 3 to be heated. The heated vortex airflow is blown out to the middle of the airflow channel 15 through the upper air outlet 13 and the lower air outlet 14 respectively. The airflow blown out by the upper air outlet 13 and the lower air outlet 14 are in the same direction and have the same tilt angle, which can be set to 10-30°. The angle between the vortex airflow blown out by the upper air outlet 13 and the vortex airflow blown out by the lower air outlet 14 can be determined according to the specific heat shrink tubing 3 being processed.

[0046] Secondly, see Figure 3 The heat shrink tubing 3 is fitted onto the wire harness 4, and the portion of the wire harness 4 containing the heat shrink tubing 3 is placed within the airflow channel 15 of the heat shrink device. This allows the inclined vortex airflow from the upper air outlet 13 to blow onto the outer surface of the heat shrink tubing 3, heating the outer wall of the upper surface of the heat shrink tubing 3. Furthermore, the inclined vortex airflow from the upper air outlet 13 can also enter between the heat shrink tubing 3 and the wire harness 4 body through one end opening, thereby heating the inner wall of the heat shrink tubing 3. Correspondingly, the inclined vortex airflow from the lower air outlet 14 can... The heat shrink tubing 3 can be heated by heating its lower outer wall and inner wall. By setting the upper and lower vortex airflows to be at the same angle towards the heat shrink tubing 3, the heat shrink tubing 3 can shrink synchronously, ensuring the forming quality of the heat shrink tubing 3 on the wire harness 4. Furthermore, by setting the upper and lower vortex airflows to partially enter between the heat shrink tubing 3 and the wire harness 4, the inner wall of the heat shrink tubing 3 can be heated, achieving synchronous heating of the outer and inner walls of the heat shrink tubing 3, thereby improving the heat shrinking efficiency and heat shrinking quality of this application.

[0047] It should be noted that the ratio of the vortex airflow blowing towards the outer wall of the heat shrink tubing 3 to the vortex airflow entering between the heat shrink tubing 3 and the wire harness 4 is 1:10-1:5. The flow rate of the vortex airflow entering between the heat shrink tubing 3 and the wire harness 4 is related to the outer diameter of the heat shrink tubing 3 and the tilt angle of the vortex airflow, and is specifically selected according to the properties of the heat shrink tubing 3 to be processed.

[0048] It should be noted that the heating time for the heat shrink tubing 3 on the wire harness 4 is 10-25 seconds, and the appropriate heating time should be selected according to the properties of the heat shrink tubing 3.

[0049] Finally, the heat shrink tubing 3 is heated and heat-shrinked onto the wire harness 4. The processed wire harness 4 can then be removed. After removing the wire harness 4, the heat shrinking device continues to operate to avoid a large difference between the temperature of the vortex airflow and the actual required temperature due to the cooling of the heating component 2. This ensures that the heating temperature accuracy of the vortex hot airflow on the heat shrink tubing 3 is within ±5℃, thereby ensuring the processing quality of the wire harness 4.

[0050] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for heat-shrink forming of wire harnesses and heat-shrink tubing, characterized in that, Includes the following steps: S1: Slide the heat shrink tubing onto the wire harness; S2: Opposite constant temperature vortex hot airflow is formed at the top and bottom of the wire harness and the heat shrink tubing. The temperature of the hot airflow is 200-400℃ and the temperature accuracy of the hot airflow is ±5℃. S3: Control the hot airflow at the top and bottom to blow towards the heat shrink tubing, the angle between the hot airflow at the top and bottom and the wire harness is 10-30°, and the hot airflow at the top and bottom has the same angle with the wire harness; S4: The hot airflow blown towards the heat shrink tubing and entering between the wire harness and the heat shrink tubing automatically enters the inner wall of the heat shrink tubing and also acts on the outer wall of the heat shrink tubing. The inside and outside are heated simultaneously, causing the heat shrink tubing to shrink onto the wire harness. The heating time of the heat shrink tubing is 10-25 seconds. S5: The heat shrink tubing is heat-shrinked onto the wire harness and the finished product is removed. After the wire harness is removed, the hot airflow remains constant. The ratio of the constant-temperature vortex airflow blowing towards the outer wall of the heat shrink tubing to the constant-temperature vortex airflow entering between the heat shrink tubing and the wire harness is 1:10-1:5.

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