Enclosed sleeve heating device, wire harness assembly line

Abstract

This utility model discloses a surround-type sleeve heating device and a wire harness assembly line. The surround-type sleeve heating device includes a main body and a heating mechanism connected to the main body. The heating mechanism includes a heating component and a power supply element. The heating component is electrically connected to the power supply element. The heating component is provided with a heating cavity with an opening, through which the component to be heated can enter the heating cavity. The heating cavity can completely or partially surround the component to be heated. The wire harness assembly line using the above-mentioned surround-type sleeve heating device has the advantages of good heating uniformity, high heat utilization rate, and precise control of the heating range.

Description

Technical Field

[0001] This utility model relates to the field of wire harness assembly and production technology, and in particular to a surround-type sleeve heating device and a wire harness assembly line. Background Technology

[0002] In the wire harness assembly process, insulation layer bonding is typically required for the wire harness, wire core, or shielding layer, followed by heat shrinking and fixing the insulation layer to the wire body. Currently, the industry commonly uses hot air heating, placing the wire harness to be processed directly into the hot air heating area. However, this traditional heating method has significant technical drawbacks: First, the heat distribution from hot air heating is uneven, easily leading to insufficient heating of the heat shrink tubing on the wire harness, resulting in incomplete local heating; second, open-air hot air heating suffers from severe heat loss, causing energy waste and affecting heating efficiency. Furthermore, existing technology struggles to achieve precise control over the heated areas of the wire harness, especially when there are wire cores in the harness that do not require heating, lacking effective isolation and protection measures. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a surround-type sleeve heating device and a wire harness assembly line, which has the advantages of good heating uniformity, high heat utilization rate, and precise control of the heating range.

[0004] In a first aspect, the enclosed sleeve heating device according to an embodiment of the present utility model includes: main body; A heating mechanism is connected to the main body. The heating mechanism includes a heating component and a power supply element. The heating component is electrically connected to the power supply element. The heating component is provided with a heating cavity. The heating cavity has an opening through which the part to be heated can enter the heating cavity. The heating cavity can completely surround or partially surround the part to be heated.

[0005] The enclosed sleeve heating device according to the embodiments of this utility model has at least the following beneficial effects: This application provides a heating mechanism including a heating component and a power supply element, wherein the heating component has an open heating cavity structure. The main body serves as a basic support structure, forming an integral device with the heating mechanism. The open design of the heating cavity allows the workpiece to be heated to directly enter the heating area. The fully enclosed or semi-enclosed structure changes the open heat conduction method of traditional hot air heating, ensuring that heat is concentrated on the surface of the workpiece through physical contact heating or closed heat radiation. The design of direct electrical connection between the heating component and the power supply element avoids energy loss during the energy transmission process and improves heat conversion efficiency. The fully or semi-enclosed shape of the heating cavity for the wire harness can achieve uniform heating to avoid insufficient local heating, and can also form a relatively closed heating environment to reduce heat loss.

[0006] According to an embodiment of the present utility model, the enclosed sleeve heating device includes a mounting block and a heating element. The heating element is fixedly connected to the mounting block and electrically connected to the power supply element. The mounting block is provided with a U-shaped groove to form the heating cavity or the mounting block structure is hollow to form the heating cavity.

[0007] According to the enclosed sleeve heating device of this utility model embodiment, the mounting block is provided with a receiving cavity, and the heating element is disposed in the receiving cavity; or, The heating element is fixed to the inner wall of the heating chamber.

[0008] According to an embodiment of the present utility model, the enclosed sleeve heating device includes a support frame and a lifting mechanism. The lifting mechanism includes a connecting seat and a lifting drive component. The lifting drive component is mounted on the support frame. The connecting seat is slidably connected to the support frame. The output end of the lifting drive component is connected to the connecting seat. The heating component is mounted on the connecting seat. The lifting drive component can drive the connecting seat to adjust its position along the radial direction of the support frame.

[0009] According to an embodiment of the present utility model, the enclosed sleeve heating device further includes a guide structure, which includes a guide rail and a slide groove. The guide rail is disposed in one of the connecting seat and the support frame, and the slide groove is disposed in the other of the connecting seat and the support frame. The guide rail and the slide groove are slidably connected.

[0010] The enclosed sleeve heating device according to an embodiment of the present invention further includes a limiting mechanism, wherein the limiting mechanism is provided with a limiting channel, and the limiting channel allows other wire cores of the wire harness that do not require heating to enter.

[0011] According to an embodiment of the present utility model, the surrounding sleeve heating device includes a limiting mechanism comprising a clamp plate connected to the support frame, and two clamp plates arranged side by side to form the limiting channel.

[0012] According to the enclosed sleeve heating device of this utility model embodiment, the entrance end of the limiting channel is provided with a trumpet-shaped guide port.

[0013] According to the enclosed sleeve heating device of this utility model embodiment, both clamping plates are provided with folding parts, and the two folding parts are mirror-arranged to form the guide opening.

[0014] Secondly, the wire harness assembly line according to the embodiments of the present invention includes the above-mentioned surrounding sleeve heating device.

[0015] The wire harness assembly line according to the embodiments of this utility model has at least the following beneficial effects: This application constructs a dedicated heating system for wire harness heat shrinking by integrating a sleeve heating device with a specific structure into the wire harness assembly equipment. The core lies in using a heating mechanism with a heating cavity to physically wrap and heat the wire harness in contact, unlike traditional hot air heating. The fully or semi-enclosed structure design of the heating cavity allows the heating element to directly act on the surface of the heat shrink tubing, forming a uniform heat conduction path and effectively eliminating the temperature gradient problem present in traditional hot air heating. Simultaneously, the closed structure of the heating cavity significantly reduces heat loss and improves heat energy utilization. The integrated design of this device with the wire harness assembly equipment achieves synchronous coordination between the heating process and the assembly process. Precise positioning of the heating components is achieved through a lifting mechanism, and the core separation function of the limiting channel ensures that the heating process only acts on the target heat shrinking area, avoiding accidental heating of other core components. The special structure of the guide port further optimizes the wire harness introduction process, improving the smoothness and safety of equipment operation.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural diagram of the enclosed sleeve heating device according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the heating assembly of the present invention in a second embodiment; Explanation of reference numerals in the attached figures: Support frame 100; guide rail 110; clamping plate 120; folding part 121; limiting channel 122; guide port 130; Connector 200; Slide 210; Lifting drive component 300; Heating assembly 400; mounting block 410; heating chamber 411; heating element 420. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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 this utility model.

[0020] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figure 1 This utility model provides a surround-type sleeve heating device, specifically including a main body and a heating mechanism. The heating mechanism is connected to the main body and includes a heating element 420 and a power supply element. A heating assembly 400 is electrically connected to the power supply element and has a heating cavity 411 with an opening. The component to be heated can enter the heating cavity 411 through the opening, and the heating cavity 411 can fully or partially surround the component to be heated.

[0023] Specifically, the main body refers to the basic structure that supports the heating mechanism, which can be implemented using a metal frame or an engineering plastic shell, to support the heating component 400 and provide an installation reference.

[0024] The heating mechanism refers to the functional module that realizes heat energy conversion. Specifically, it can be implemented by combining a resistance heating element with a power supply module, used to convert electrical energy into heat energy and transfer it to the part to be heated. The heating element 420 is the component that directly generates heat, specifically using a ceramic heating element or a metal resistance wire, used for heat conduction or radiation within the heating chamber 411. The power supply element is the energy supply device, specifically using a lithium battery pack or an external power adapter, used to provide a stable power input to the heating element 420. The heating chamber 411 is a closed or semi-closed space that accommodates the part to be heated, specifically implemented using a U-shaped groove or hollow cavity structure, used to limit heat diffusion and concentrate its effect on the target area. The opening refers to the material inlet and outlet of the heating chamber 411, specifically implemented using a rectangular or circular through-hole structure, used to allow the part to be heated to enter the heating area while maintaining operational convenience.

[0025] Understandably, the heating element 420 obtains electrical energy from the power supply element and generates heat through an electrical connection. The heating cavity 411 encloses the part to be heated in a fully or semi-enclosed manner, forming a directional heating environment. The open design allows the wiring harness to enter the heating area along a specific path, avoiding heat loss as is common in traditional open heating systems. Once the part to be heated enters the heating cavity 411, the heating element 420 transfers heat through direct contact or radiation, ensuring uniform heating of all parts of the heat shrink tubing.

[0026] In the fully enclosed state, the heating cavity 411 forms a sealed space, and heat circulates within the cavity; while in the semi-enclosed state, the heating cavity 411 forms a directional heating area, suitable for local heating needs.

[0027] Specifically, such as Figure 1 As shown, the heating assembly 400 includes a mounting block 410 and a heating element 420. The heating element 420 is fixedly connected to the mounting block 410 and electrically connected to the power supply element.

[0028] In some embodiments of this application, the mounting block 410 is provided with a U-shaped groove to form a heating cavity 411.

[0029] It is understandable that a U-shaped groove refers to a groove structure with a U-shaped cross-section, which is used to heat the workpiece by partially enclosing it.

[0030] Specifically, the mounting block 410 mechanically secures the heating element 420 to its surface or interior, preventing displacement due to vibration or temperature changes during heating and thus maintaining a stable heat conduction path. When the mounting block 410 has a U-shaped groove machined on its surface, the part to be heated can be inserted laterally through the groove opening, and the heating element 420 on the inner wall of the groove directly heats the contact surface in a directional manner. The power supply element forms a closed loop with the heating element 420 through a wire, and the heating power is precisely controlled by adjusting the current intensity, so that the heat is concentrated on the target area of ​​the part to be heated.

[0031] Advantageously, this application utilizes a rigid connection structure between the mounting block 410 and the heating element 420 to allow heat to be directly transferred to the heated component via solid-state conduction, significantly improving thermal efficiency. Furthermore, the directional heating cavity 411 formed by the U-shaped groove can confine heat transfer within a specific space, preventing ineffective diffusion.

[0032] In other embodiments of this application, such as Figure 2 As shown, the mounting block 410 has a hollow structure to form a heating cavity 411.

[0033] It is understandable that a hollow structure refers to a block-shaped body with a through cavity inside. Specifically, it can be formed into a closed cavity through casting or splicing. Its function is to heat the workpiece by surrounding it in a fully enclosed shape.

[0034] Specifically, when the mounting block 410 adopts a hollow structure, the component to be heated can be inserted longitudinally into the through cavity, and the heating elements 420 distributed on the inner wall of the cavity achieve all-round radiant heating. The power supply element forms a closed loop with the heating element 420 through wires, and the heating power is precisely controlled by adjusting the current intensity, so that the heat is concentrated on the target area of ​​the component to be heated.

[0035] The advantage is that the directional heating cavity 411 formed by the hollow structure can confine the heat transfer within a specific space and avoid ineffective diffusion.

[0036] The heating cavity 411 formed by the U-shaped groove or hollow structure can be selected to be fully enclosed or semi-enclosed according to the shape of the part to be heated, which can improve the heating uniformity while reducing the loss of heat to the surrounding environment.

[0037] Optionally, in some embodiments of this application, the mounting block 410 is provided with a receiving cavity, and the heating element 420 is disposed in the receiving cavity.

[0038] It is understood that the accommodating cavity refers to the cavity structure set inside the mounting block 410 to accommodate the heating element 420. Its function is to provide a stable mounting space for the heating element 420 and to uniformly transfer heat to the heating cavity 411 through the thermal conductivity of the material of the mounting block 410.

[0039] Specifically, when a cavity structure is used, the heating element 420 is completely embedded inside the mounting block 410, and the heat is transferred to the heating cavity 411 through the overall thermal diffusion of the mounting block 410, thus avoiding local overheating or uneven heat distribution.

[0040] Alternatively, in some other embodiments of this application, the heating element 420 is fixed to the inner wall of the heating cavity 411. Specifically, the heating element 420 may be evenly distributed on the inner wall of the heating cavity 411.

[0041] It is understandable that the inner wall of the heating cavity 411 refers to the cavity surface surrounding the part to be heated. Its function is to shorten the distance between the heating element 420 and the part to be heated through a direct contact heat conduction path, thereby reducing heat loss during the heat transfer process.

[0042] Specifically, when an inner wall fixing structure is adopted, the heating element 420 is directly attached to the surface of the heating cavity 411, and the heat is quickly applied to the surface of the part to be heated through contact conduction, eliminating the heat loss caused by the air medium in traditional hot air heating.

[0043] In both embodiments described above, physical contact conduction replaces non-contact heating, ensuring a controllable and stable heat transfer path. Compared to existing technologies, traditional hot air heating relies on air convection to transfer heat, resulting in low thermal efficiency and uneven heating surfaces. This application establishes a direct heat conduction path through a accommodating cavity or an inner wall fixed structure, eliminating thermal resistance caused by the air medium. This allows heat to be directionally transferred to the surface of the workpiece to be heated. Simultaneously, the heat-conducting material of the mounting block 410 or the inner wall achieves uniform heat diffusion, solving the problem of uneven heating caused by low heat conduction efficiency between the heating element 420 and the workpiece to be heated. This ensures uniform heating of the workpiece surface and significantly improves heat utilization, avoiding energy waste caused by heat loss in traditional heating methods.

[0044] According to some embodiments of this application, such as Figure 1 As shown, the main body includes a support frame 100 and a lifting mechanism. The lifting mechanism includes a connecting seat 200 and a lifting drive component 300. The lifting drive component 300 is mounted on the support frame 100. The connecting seat 200 is slidably connected to the support frame 100. The output end of the lifting drive component 300 is connected to the connecting seat 200. The heating component 400 is mounted on the connecting seat 200. The lifting drive component 300 can drive the connecting seat 200 to adjust its position along the radial direction of the support frame 100.

[0045] As a further improvement to the solution, the main body also includes a guide structure, which includes a guide rail 110 and a slide groove 210. The guide rail 110 is mounted on the support frame 100, and the slide groove 210 is mounted on the connecting seat 200. The guide rail 110 and the slide groove 210 are slidably connected.

[0046] It is understandable that the lifting drive component 300 refers to the power element that generates linear motion, which can be implemented using an electric push rod, a pneumatic cylinder, or a hydraulic cylinder, and is used to output axial driving force to move the connecting seat 200. The guide structure is implemented using a sliding pair structure, and physical constraints are formed through the complementary design of the guide rail 110 and the slide groove 210.

[0047] Specifically, the connecting seat 200 forms a movable pair with the support frame 100 through a sliding connection. Under the linear drive of the lifting drive 300, it drives the heating component 400 to precisely displace in the radial direction. When processing wire harnesses of different diameters, the lifting drive 300 can control the connecting seat 200 to move to the target position, so that the heating cavity 411 completely or partially covers the area to be heated. This dynamic adjustment mechanism ensures that the heating element 420 and the part to be heated always maintain the optimal contact distance, avoiding local overheating or heating blind spots caused by fixed installation. Through precise control of radial displacement, heating energy can be concentrated on the target area, effectively reducing heat diffusion to the surrounding environment. At the same time, when the lifting drive 300 drives the connecting seat 200 to move in the radial direction of the support frame 100, the guide rail 110 is embedded in the slide groove 210 and slides along the length of the slide groove 210. Since the contact surfaces of the guide rail 110 and the slide 210 form a continuous guide surface, the movement trajectory of the connecting seat 200 is restricted to the extension direction of the slide 210, thereby avoiding deviation caused by the output direction deviation of the drive component or external load.

[0048] Beneficially, this application utilizes an adjustable lifting mechanism to enable the heating component 400 to dynamically adapt to different specifications of the workpiece to be heated, forming a variable heating coverage area in the radial direction. This active contact heating method overcomes the limitations of traditional fixed heating, eliminating heating blind spots and reducing heat conduction loss by decreasing the gap between the heating element 420 and the workpiece to be heated. It achieves adaptive matching between the heating component 400 and the heated object, ensuring that the heating cavity 411 always covers the target area at the optimal distance. The concentrated release of heating energy effectively improves heat conduction efficiency and avoids heat loss caused by air convection in traditional hot air heating. The controllable adjustment function of the radial position allows a single heating device to adapt to various wire diameter specifications, solving the problem of poor versatility of fixed heating equipment.

[0049] According to some embodiments of this application, such as Figure 1 As shown, the connector 200 is provided with two heating components 400, which are arranged side by side to achieve simultaneous heating of both ends of a wire harness; or, it can achieve simultaneous heating of the ends of two wire harnesses, which helps to further improve production efficiency.

[0050] In addition, such as Figure 1As shown, this application also restricts the movement freedom of the connecting seat 200 to a single direction by cooperating with the guide rail 110 and the slide groove 210, eliminating the possibility of lateral offset. At the same time, the rigid contact of the sliding pair improves the positioning stability, solving the problem of movement trajectory deviation caused by the lack of a guide structure when the lifting drive 300 drives the connecting seat 200 to adjust its radial position. This ensures that the heating component 400 always maintains precise alignment with the part to be heated during the movement, avoiding uneven heating or heat loss caused by position deviation, and reducing energy waste caused by repeated position adjustments.

[0051] According to some embodiments of this application, the enclosed sleeve heating device of this application is further provided with a limiting mechanism. Specifically, as shown in... Figure 1 As shown, the limiting mechanism includes a clamping plate 120, which is connected to the support frame 100. The two clamping plates 120 are arranged side by side to form a limiting channel 122, which allows other wire cores of the wire harness that do not require heating to enter.

[0052] It is understood that the limiting channel 122 refers to a narrow space formed by two parallel clamping plates 120. Specifically, the different wire core diameters can be adapted by adjusting the spacing of the clamping plates 120. The limiting channel 122 is used to separate the wire core that does not need to be heated from the heating area, and to move the wire core along a predetermined path to prevent it from entering the heating chamber 411 and affecting the thermal efficiency.

[0053] Specifically, when the wire harness enters the heating device, the wire cores or shielding layers that are already fitted with insulating tubes and require heating are placed inside the heating chamber 411, while the wire cores that do not require heating are restricted outside the heating area by the limiting channel 122. The limiting channel 122 actively separates the wire cores, preventing direct contact between the non-heated parts and the heating chamber 411, reducing heat diffusion paths, simplifying the operation process, and achieving precise separation of the heated and non-heated parts of the wire harness. This effectively prevents non-heated wire cores from entering the heating area and causing heat loss, improving heating efficiency and energy utilization. It also reduces the risk of uneven heating due to wire core misalignment, achieving precise spatial isolation of non-heated wire cores and effectively preventing damage to the wire core insulation layer caused by heat conduction during heating. Furthermore, the rigid guiding structure of the limiting channel 122 prevents wire core entanglement or cross-contact, ensuring independent positioning of each wire core in a multi-core wire harness. The modular design of the clamp 120 supports quick replacement, adapting to the assembly needs of different wire core layouts.

[0054] As a further improvement to the plan, such as Figure 1 As shown, the entrance end of the limiting channel 122 is provided with a trumpet-shaped guide opening 130. Specifically, both clamps 120 are provided with folding portions 121, and the two folding portions 121 are mirrored to form the guide opening 130.

[0055] It is understandable that the trumpet-shaped guide opening 130 refers to an inlet end with an outwardly expanding opening shape, and the folded portion 121 refers to the curved structure extending outward from the edge of the clamping plate 120. Specifically, it can be achieved using sheet metal stamping or injection molding processes, and its bending angle can range from 30 degrees to 60 degrees. A mirrored arrangement means that the folded portions 121 of the two clamping plates 120 are arranged symmetrically with the central axis of the limiting channel 122 as the axis of symmetry. This can be achieved by adjusting the installation position of the clamping plates 120 or by using symmetrical mold processing. The guide opening 130 refers to the gradually expanding inlet structure formed by the two folded portions 121. Specifically, it can be formed by controlling the unfolding angle of the folded portions 121 to create a trumpet-shaped opening, with the opening width gradually decreasing along the feeding direction to the width of the limiting channel 122.

[0056] Specifically, when the wire harness approaches the limiting channel 122, its end first contacts the inclined surface of the guide opening 130 formed by the two folding portions 121. Due to the mirror-symmetric layout of the folding portions 121, any deviation of the wire harness in any direction will be constrained by the symmetrical inclined surface, forcing the wire harness to move along the central axis of the guide opening 130. As the wire harness continues to feed, the inclined surface of the folding portions 121 continuously generates a lateral component force, automatically correcting the positional deviation of the wire harness until the wire harness completely enters the straight section of the limiting channel 122.

[0057] In some specific embodiments, the folding portion 121 can be integrally formed with the body of the clamping plate 120, for example, by folding the end of the clamping plate 120 outward to form a guide slope through a bending process.

[0058] This application also provides a wire harness assembly line that utilizes the aforementioned enclosed sleeve heating device.

[0059] Understandably, when the wire harness is delivered to the heating station, the lifting mechanism drives the heating cavity 411 to move radially, ensuring that the wire harness segment to be heated is completely embedded within the U-shaped heating cavity 411. The heat generated by the heating element 420 after being energized is directly conducted to the surface of the heat shrink tubing through the metal cavity wall, forming a uniform circumferential temperature distribution. The limiting channel 122 isolates non-target wire cores during heating, preventing them from contacting high-temperature areas. The flared structure of the guide port 130 guides the wire harness accurately into the heating cavity 411, preventing incomplete heating due to wire misalignment.

[0060] Furthermore, along the processing route of the wire harness, a wire harness pretreatment device and a surrounding sleeve heating device are sequentially arranged. The wire harness pretreatment device includes an insulation layer removal mechanism, a shielding layer disintegration mechanism, and a shielding layer twisting mechanism, so that the shielding layer at the end of the wire harness can be separated from the wire core, so that the shielding layer can be heat-shrinked and fixed by the heat-shrink tubing device provided in this application.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A surround-type sleeve heating device, characterized in that, include: main body; A heating mechanism is connected to the main body. The heating mechanism includes a heating component (400) and a power supply element. The heating component (400) is electrically connected to the power supply element. The heating component (400) is provided with a heating cavity (411). The heating cavity (411) has an opening, through which the part to be heated can enter the heating cavity (411). The heating cavity (411) can completely surround or partially surround the part to be heated.

2. The enclosed sleeve heating device according to claim 1, characterized in that, The heating assembly (400) includes a mounting block (410) and a heating element (420). The heating element (420) is fixedly connected to the mounting block (410) and electrically connected to the power supply element. The mounting block (410) is provided with a U-shaped groove to form the heating cavity (411) or the mounting block (410) is hollow to form the heating cavity (411).

3. The enclosed sleeve heating device according to claim 2, characterized in that, The mounting block (410) is provided with a receiving cavity, and the heating element (420) is disposed in the receiving cavity; or, The heating element (420) is fixed to the inner wall of the heating chamber (411).

4. The enclosed sleeve heating device according to claim 1, characterized in that, The main body includes a support frame (100) and a lifting mechanism. The lifting mechanism includes a connecting seat (200) and a lifting drive (300). The lifting drive (300) is mounted on the support frame (100). The connecting seat (200) is slidably connected to the support frame (100). The output end of the lifting drive (300) is connected to the connecting seat (200). The heating component (400) is mounted on the connecting seat (200). The lifting drive (300) can drive the connecting seat (200) to adjust its position along the radial direction of the support frame (100).

5. The enclosed sleeve heating device according to claim 4, characterized in that, The main body also includes a guide structure, which includes a guide rail (110) and a slide groove (210). The guide rail (110) is disposed in one of the connecting seat (200) and the support frame (100), and the slide groove (210) is disposed in the other of the connecting seat (200) and the support frame (100). The guide rail (110) and the slide groove (210) are slidably connected.

6. The enclosed sleeve heating device according to claim 4, characterized in that, It also includes a limiting mechanism, which is provided with a limiting channel (122) that allows other wire cores in the harness that do not require heating to enter.

7. The enclosed sleeve heating device according to claim 6, characterized in that, The limiting mechanism includes a clamping plate (120) connected to the support frame (100), and two clamping plates (120) are arranged side by side to form the limiting channel (122).

8. The enclosed sleeve heating device according to claim 7, characterized in that, The entrance end of the limiting channel (122) is provided with a trumpet-shaped guide port (130).

9. The enclosed sleeve heating device according to claim 8, characterized in that, Both clamps (120) are provided with folding portions (121), and the two folding portions (121) are mirrored to form the guide opening (130).

10. A wire harness assembly line, characterized in that, Includes the enclosed sleeve heating device as described in any one of claims 1 to 9.

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