A harness production line's shielding wire braiding device and working method

Abstract

This invention discloses a device for processing shielding wire in a wire harness production line, comprising a fixed outer cylinder, one end of which is open and the other end has an end wall. An inner cylinder is coaxially arranged inside the outer cylinder, and the rear end of the inner cylinder is fixedly connected to the end wall. A conical ring head is integrally and coaxially arranged at the front end of the inner cylinder, with the cylinder opening in front of the conical ring head. A forward-through air guide channel is coaxially arranged inside the integral structure formed by the inner cylinder and the conical ring head. This invention solves the problem that the shielding layer cannot be completely peeled off after the outer sheath of the wire harness is removed, thus interfering with the subsequent inner sheath removal process.

Description

Technical Field

[0001] This invention belongs to the field of wire harness manufacturing. Background Technology

[0002] A car's anti-signal interference wiring harness 90 generally consists of at least an outer sheath, an inner sheath, and an intermediate metal wire shielding layer 91, such as... Figure 1 As shown. The shielding layer is typically a flexible structure woven / wound with multiple strands of fine metal wires, which is highly resilient and easily dispersed.

[0003] In the wire harness production process, after the outer sheath is peeled off at the end of the wire harness, the inner sheath is exposed at the wire harness end 3. However, the shielding layer cannot be completely peeled off, and the remaining part is attached to the outer periphery of the end in discrete filaments. The remaining filaments are of different lengths and have random directions, which will seriously interfere with the subsequent inner sheath removal process, such as wrapping around the cutting tool or causing incomplete removal of the inner sheath. Traditional processes lack efficient methods for handling discrete shielding layer filaments, requiring manual intervention or complex mechanical combing, which is inefficient and easily damages the wire harness. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a device and working method for turning over the shielding wire in a wire harness production line, which solves the problem that the shielding layer cannot be completely peeled off after the outer sheath is removed from the end of the wire harness, thus interfering with the subsequent inner sheath removal process.

[0005] Technical solution: To achieve the above objectives, the present invention provides a wire harness production line refurbishing shielding wire device, comprising a fixed outer cylinder, one end of which is open and the other end has an end wall, an inner cylinder coaxially disposed within the outer cylinder, the rear end of the inner cylinder being fixedly connected to the end wall, a conical ring head integrally disposed coaxially at the front end of the inner cylinder, the front of the conical ring head being the cylinder opening, and a forward-through air guide channel being disposed coaxially within the integral structure formed by the inner cylinder and the conical ring head.

[0006] The tail end of the air guide channel is connected to an air guide pipe. Driven by a centrifugal fan, the air guide pipe can input air pressure into the air guide channel, thereby causing the air outlet at the front end of the air guide channel to blow air forward. The inner diameter of the air outlet at the front end of the air guide channel is between the outer diameter of the wire harness and the outer diameter of the wire harness end.

[0007] Furthermore, it also includes piston rings, the outer ring of which is in a movable sealing fit with the inner wall of the outer cylinder, and the expansion joint can drive the piston ring to slide along the axis of the outer cylinder; the inner ring of the piston ring is integrally provided with a metal structure ring on the same axis, and the inner diameter of the metal structure ring is larger than the outer diameter of the inner cylinder.

[0008] It also includes a conical elastic thin wall attached to the outer wall of the conical ring head, with the rear end of the conical elastic wall fixedly and sealed to the inner ring of the metal structure ring along the contour; the front end of the conical elastic wall is integrally sealed to the outer edge of the front end of the conical ring head through a ring of epoxy resin adhesive; a pressure control chamber is formed between the inner and outer cylinders on the rear side of the metal structure ring, and a pressure control air pump is formed, with the output end of the pressure control air pump connected to the rear end of the pressure control chamber through a pressure guide pipe; an initial slit is formed between the rear inner wall of the conical elastic wall and the front outer wall of the inner cylinder, with the rear end of the initial slit connected to the pressure control chamber; when the pressure in the pressure control chamber increases, the air pressure in the pressure control chamber is pushed forward through the initial slit between the conical elastic wall and the outer wall of the conical ring head, causing the conical elastic wall to expand outward.

[0009] Furthermore, the wire harness includes the wire harness after the outermost layer of the end has been stripped by the wire stripping device. One end of the wire harness forms a wire harness end that exposes the inner sheath of the wire harness. A ring of shielding wires is discretely distributed around the outer periphery of the wire harness end.

[0010] Furthermore, it also includes a wire harness clamping robot that can clamp the wire harness, and the wire harness clamping robot moves the wire harness end of the clamped wire harness to the coaxial position on the front side of the outer cylinder.

[0011] Furthermore, the conical ring head is located at the middle of the outer cylinder along its length.

[0012] Furthermore, the conical annular elastic thin wall is made of elastic silicone or elastic rubber.

[0013] Furthermore, a method for operating a shielding wire handling device in a wire harness production line is characterized by: Step 1, the wire harness clamping robot moves the wire harness end of the clamped wire harness to the front of the outer cylinder, coaxial with the outer cylinder; controlling the centrifugal fan, the air duct inputs air pressure into the air duct, so that the air outlet at the front end of the air duct blows air towards one end of the wire harness end in the forward axial direction, thereby forming a backward airflow along the axial direction on the circumferential surface of the wire harness end, causing the shielding wire bundle that was originally still attached to the surface of the wire harness end to disperse away from the wire harness end under the blowing of the backward airflow and detach from the circumferential surface of the wire harness end.

[0014] Step 2: Pause the centrifugal fan. The wire harness clamping robot moves the wire harness end along the axial direction backward until the wire harness end is inserted into the air outlet at the front end of the air guide channel along the axial direction, until the front end of the conical ring head reaches the root of the wire harness end. At this time, the shielding layer wire bundle is distributed on the outer periphery of the conical ring elastic wall.

[0015] Step 3: Control the pressure control air pump to increase the pressure inside the pressure control chamber. The air pressure inside the pressure control chamber is forced forward through the starting slit between the conical annular elastic wall and the outer wall of the conical annular head, causing the conical annular elastic wall to expand outward and transform into a bulging elastic wall. The shielding layer filaments originally distributed on the outer periphery of the conical annular elastic wall are flipped backward around the root under the bulging action of the bulging elastic wall.

[0016] Step four: Control the pressure control air pump to restore the pressure inside the pressure control chamber to normal pressure, and restore the bulging elastic wall to a conical annular elastic wall shape.

[0017] Step 5: During this step, the pressure control air pump is controlled to maintain constant pressure within the pressure control chamber. Simultaneously, the telescopic device drives the piston ring to slide forward along the outer cylinder axis. The thicker end of the conical annular elastic wall follows the piston ring forward, gradually separating from the outer wall of the conical ring head. When the piston ring slides to the front of the outer cylinder, the conical annular elastic wall, originally with its thinner end facing forward, flips back to face backward, transforming into a second-form conical annular elastic wall. During this process, further flipping actions are performed on each shielding layer wire bundle. At this point, each shielding layer wire bundle has completely detached from the outer periphery of the wire bundle end.

[0018] Step six: Control the pressure control air pump to increase the pressure inside the pressure control chamber, thereby increasing the pressure on the outer periphery of the second-form conical annular elastic wall. Under the action of the outer periphery air pressure, the second-form conical annular elastic wall squeezes the shielding layer wire bundles inward, causing the shielding layer wire bundles that have already been flipped back to adhere even more tightly to the outer surface of the unstripped part of the attached wire bundle. At this time, the second-form conical annular elastic wall transforms into the third-form annular elastic wall.

[0019] Step 7: Control the pressure control air pump to change the pressure inside the pressure control chamber from positive pressure to negative pressure. Under the action of the outer negative pressure, the third-form annular elastic wall expands away from its own axis, transforming into a fourth-form annular elastic wall. This causes the fourth-form annular elastic wall to separate from the shielding layer wire bundle that has been flipped back and stably attached to the outer surface of the unstripped part of the wire harness.

[0020] Beneficial effects: This invention uses a variable-shape elastic thin-walled structure to solve the problems of filament dispersion, flipping, adhesion, and separation in stages through four morphological transformations (bulging → flipping → pressing → separation); combined with "airflow cleaning + air pressure deformation + mechanical flipping", it achieves filament control; and the final negative pressure stage design overcomes the industry problem of elastic tools and metal filaments easily sticking together. Attached Figure Description

[0021] Figure 1 This is a comparative diagram showing the process before and after treatment in this solution;

[0022] Figure 2 This is a schematic diagram of the overall structure of the device in step one state;

[0023] Figure 3 for Figure 2 A magnified 3D image of a portion of the image;

[0024] Figure 4 for Figure 2 A three-dimensional diagram of the overall structure;

[0025] Figure 5 This is a schematic diagram of the process from "Step Two" to "Step Four";

[0026] Figure 6 This is a schematic diagram of the process from "Step Five" to "Step Seven". Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] like Figures 1 to 6 As shown, Figure 1 Between the outer and inner sheaths of the wire harness 90, there exists a shielding layer 91 composed of metal wires. After the outermost sheath of the wire harness 1 is stripped by the wire stripping device, a section of wire harness end 3 is formed, exposing the inner sheath of the wire harness. The next step requires further stripping the inner sheath on the wire harness end 3 to expose the inner core. Since the shielding layer 91 is usually woven or wound from multiple strands of fine metal wires, forming flexible filaments with high toughness, a large amount of shielding layer 91 that cannot be completely stripped exists around the newly formed wire harness end 3. This shielding layer 91 that cannot be completely stripped is in the form of discrete filaments. These discrete metal wires are often of varying lengths and random directions. The shielding layer 91 on the periphery of the wire harness end 3 that is in the form of discrete filaments is referred to as the shielding layer filament bundle 2. Figure 1 As shown, the shielding layer strands 2 that are discretely distributed around the outer periphery of the wire harness end 3 will seriously interfere with the subsequent stripping process of the inner sheath of the wire harness end 3 in the next step. For example, they may wrap around the stripping tool or cause the inner sheath to be not completely stripped. Therefore, before performing the next stripping step, the shielding layer strands 2 around the outer periphery of the wire harness end 3 need to be flipped back.

[0029] The core of this solution is to provide a method that, after the outermost layer of the wire harness 1 is stripped by a wire stripping device, can fold the shielding layer wire bundles 2, which are discretely distributed around the outer periphery of the wire harness end 3, backward to the rear of the wire harness end 3, and tightly adhere to the outer surface of the unstripped portion of the wire harness 1, creating a clean and interference-free operating environment for subsequent inner sheath removal; the specific solution is as follows:

[0030] A wire harness production line includes a wire harness 1 whose outermost sheath has been stripped by a wire stripping device. One end of the wire harness 1 forms a wire harness end 3 that exposes the inner sheath of the wire harness. A ring of shielding wire bundles 2 is discretely distributed around the outer periphery of the wire harness end 3. The root of the shielding wire bundles 2 is still connected to the boundary area between the root of the wire harness end 3 and the unstripped outer sheath.

[0031] The device components of this solution:

[0032] like Figure 2 , 3 As shown in Figure 4, the outer cylinder 4 is fixedly arranged laterally. One end of the outer cylinder 4 is open, and the other end is sealed with an end wall 78. An inner cylinder 17 is coaxially arranged inside the outer cylinder 4. The rear end of the inner cylinder 17 is fixedly connected to the end wall 78. A conical ring head 15 is integrally arranged coaxially at the front end of the inner cylinder 17. The conical ring head 15 is located at the middle of the length direction of the outer cylinder 4. The cylinder opening 5 is in front of the conical ring head 15. The inner cylinder 17 and the conical ring head 15 form an integral structure with a forward-through air guide channel 10 arranged coaxially inside.

[0033] The tail end of the air guide channel 10 is connected to the air guide pipe 9. Driven by the centrifugal fan, the air guide pipe 9 can input air pressure into the air guide channel 10, thereby causing the air outlet 10a at the front end of the air guide channel 10 to blow air forward and form a concentrated axial airflow. The inner diameter of the air outlet 10a at the front end of the air guide channel 10 is designed to be between the outer diameter of the wire harness 90 and the outer diameter of the wire harness end 3, so as to ensure that the airflow can effectively act on the surface of the wire harness end 3.

[0034] It also includes a piston ring 43, the outer ring of which is in a movable sealing fit with the inner wall of the outer cylinder 4 to form a sliding sealing surface. An electric telescoping device 41 is installed on the inner wall of the rear section of the outer cylinder 4 along the length direction. The telescoping device 41 can drive the piston ring 43 to slide along the axial direction of the outer cylinder 4 to achieve precise axial displacement control.

[0035] The inner ring of the piston ring 43 is integrally provided with a metal structure ring 16 on the same axis. The inner diameter of the metal structure ring 16 is larger than the outer diameter of the inner cylinder 17, so that the inner cylinder 17 can pass relatively freely within the metal structure ring 16.

[0036] It also includes a non-adhesive conical elastic thin wall 14 attached to the outer wall of the conical ring head 15. The thickness of the conical elastic thin wall 14 is between 1 mm and 1.5 mm. The conical elastic thin wall 14 is made of elastic silicone or elastic rubber and has good deformation recovery ability and flexibility. The rear end of the conical elastic wall 14 is fixedly and sealed to the inner ring of the metal structure ring 16 along the contour. The front end of the conical elastic wall 14 is sealed and integrally connected to the outer edge of the front end of the conical ring head 15 through a ring of epoxy resin adhesive 12 or other integrated connection structure to ensure a firm connection and good airtightness.

[0037] Behind the metal structure ring 16, a pressure control chamber 7 is formed between the inner cylinder 17 and the outer cylinder 4. The pressure control chamber 7 is an annular sealed chamber. A pressure control air pump is connected to the rear end of the pressure control chamber 7 through a pressure guide pipe 8. It is used to fill or extract gas into the pressure control chamber 7 to change its internal pressure.

[0038] An initiating slit 18 is formed between the inner wall of the rear section of the conical annular elastic wall 14 and the outer wall of the front end of the inner cylinder 17. The initiating slit 18 is a narrow annular gap. The rear end of the initiating slit 18 is connected to the pressure control chamber 7. When the pressure in the pressure control chamber 7 increases, the air pressure in the pressure control chamber 7 is pushed forward through the initiating slit 18 between the conical annular elastic wall 14 and the outer wall of the conical annular head 15, causing the conical annular elastic wall 14 to expand outward and its shape to change in a controllable manner.

[0039] It also includes a wire harness clamping robot 211 that can clamp the wire harness 1. The robot has multi-degree-of-freedom motion capability. The wire harness clamping robot 211 moves the wire harness end 3 of the clamped wire harness 1 to the front of the outer cylinder 4 coaxially to ensure accurate alignment in subsequent operations.

[0040] like Figure 5 and 6 As shown, the working method and steps of this solution are as follows:

[0041] Step 1: The wire harness clamping robot 211 moves the wire harness end 3 of the clamped wire harness 1 to the front of the outer cylinder 4, ensuring accurate positioning. The centrifugal fan is controlled, and the air duct 9 inputs air pressure into the air duct 10, causing the air outlet 10a at the front end of the air duct 10 to blow air towards one end of the wire harness end 3 along the forward axis, generating a stable and continuous backward airflow. This creates a backward airflow along the axis on the circumferential surface of the wire harness end 3, causing the shielding layer wires 2, which were originally partially attached to the surface of the wire harness end 3, to disperse away from the wire harness end 3 under the influence of the backward airflow, thus initially cleaning the loosely attached metal wires. Figure 2 As shown.

[0042] Step two: Pause the centrifugal fan. The wire harness clamping robot 211 moves backward along the axial direction, smoothly advancing the wire harness end 3 along the axial direction until it inserts into the front air outlet 10a of the air guide channel 10, entering the predetermined operating position. This continues until the front end of the conical ring head 15 reaches the root of the wire harness end 3, i.e., the starting point of the exposed inner skin area. At this point, the shielding layer wire bundle 2 is naturally guided and distributed around the outer periphery of the conical ring elastic wall 14, surrounding the front of the conical ring head 15, as shown below. Figure 5 The image above.

[0043] Step 3: Control the pressure control air pump to increase the pressure inside the pressure control chamber 7 (for example, to 0.1-0.3 MPa). The air pressure inside the pressure control chamber 7 is forced forward through the starting slit 18 between the conical annular elastic wall 14 and the outer wall of the conical annular head 15, causing the conical annular elastic wall 14 to expand outward. The conical annular elastic wall 14 changes to an bulging elastic wall 14a, as shown. Figure 5 The shielding layer filaments 2, originally distributed around the outer periphery of the conical annular elastic wall 14, are folded backward around their roots under the radial expansion of the bulging elastic wall 14a, that is, bent towards the unstripped portion of the wire bundle, so that the roots of each shielding layer filament bundle 2 tend to be perpendicular to the axis of the wire bundle end 3, laying the foundation for subsequent complete folding.

[0044] Step four: Control the pressure control air pump to restore the pressure inside the pressure control chamber 7 to normal pressure. The bulging elastic wall 14a returns to its conical ring shape under its own elasticity. However, at this time, the shielding layer filament bundle 2 continues to fold backward due to plastic deformation. Figure 5 The image below.

[0045] Step 5: During this step, the pressure control air pump is controlled to maintain constant pressure within the pressure control chamber 7. Simultaneously, the telescopic device 41 drives the piston ring 43 to slide forward along the axis of the outer cylinder 4, pushing the metal structure ring 16 forward. The thicker end (rear end) of the conical annular elastic wall 14 follows the piston ring 43 forward, gradually separating the conical annular elastic wall 14 from the outer wall of the conical ring head 15. When the piston ring 43 slides to the front of the outer cylinder 4, the conical annular elastic wall 14, originally with its thinner end facing forward, flips backward, completing the shape reversal. Figure 6 As shown in the figure above, the conical annular elastic wall 14 is flipped back into the second form of the conical annular elastic wall 14b. During the process of the conical annular elastic wall 14 being flipped back into the second form of the conical annular elastic wall 14b, its inner surface performs a further flipping action on each shielding layer wire bundle 2, applying a continuous backward and inward force. At this time, each shielding layer wire bundle 2 has completely detached from the outer periphery of the wire bundle end 3 and is wrapped or constrained in the trumpet-shaped space formed by the second form of the conical annular elastic wall 14b. Each shielding layer wire bundle 2 is constrained within the area surrounded by the second form of the conical annular elastic wall 14b.

[0046] Step six: Control the pressure control air pump to increase the pressure inside the pressure control chamber 7, for example, to 0.1-0.3 MPa or higher. This increases the pressure on the outer periphery of the second-shaped conical annular elastic wall 14b. This pressure is transmitted through the elastic wall. Under the action of the outer periphery air pressure, the second-shaped conical annular elastic wall 14b squeezes the shielding layer wire bundle 2 inward, pressing it against the outer surface of the unstripped part of the wire bundle 1. This further tightens the already flipped-back shielding layer wire bundles 2 against the outer surface of the unstripped part of the wire bundle 1, achieving a tight and flat adhesion effect. At this time, the shape of the second-shaped conical annular elastic wall 14b changes slightly under the pressure, transforming into the third-shaped annular elastic wall 14c. Its main function is to maintain the pressure on the shielding layer wire bundle 2.

[0047] Step 7: Control the pressure control air pump to change the pressure inside the pressure control chamber 7 from positive pressure to negative pressure, for example, to -0.05 to -0.1 MPa. This causes the third-form annular elastic wall 14c to generate outward suction under the negative pressure of the outer ring, expanding away from its own axis. Its diameter increases, reducing the contact pressure between it and the shielding layer wire bundle 2 attached to the wire harness until they separate. The third-form annular elastic wall 14c transforms into the fourth-form annular elastic wall 14d, thereby separating the fourth-form annular elastic wall 14d from the shielding layer wire bundle 2 that has been flipped back and stably attached to the outer surface of the unstripped part of the wire harness 1. This avoids the "dragging" phenomenon that occurs when the wire harness 1 is pulled back in the next step, i.e., the elastic wall sticking or causing the shielding wire bundle to spring back.

[0048] Step 8: The wire harness clamping robot 211 pulls the wire harness end 3 of the clamped wire harness 1 backward from the outer cylinder 4 smoothly. During the pulling process, since the shielding layer wire bundle 2, which has been flipped back and stably attached to the outer surface of the unstripped part of the wire harness 1, is separated from the fourth-form annular elastic wall 14d, there will be no "dragging" phenomenon. Finally, the device returns to the initial state, and the complete cycle of this "wire flipping" process is completely finished, waiting for the next "wire flipping" process cycle.

[0049] The core mechanism of this solution is to achieve precise flipping and attachment of the shielding layer filament bundle through "airflow pretreatment + elastic thin-wall morphology control + air pressure coordinated operation".

[0050] Key component function:

[0051]

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A device for handling shielding wire in a wire harness production line, characterized in that: The device includes a fixed outer cylinder (4), one end of which is open and the other end has an end wall (78). An inner cylinder (17) is coaxially arranged inside the outer cylinder (4). The rear end of the inner cylinder (17) is fixedly connected to the end wall (78). A conical ring head (15) is coaxially integrally arranged at the front end of the inner cylinder (17). The front of the conical ring head (15) is the cylinder opening (5). The inner cylinder (17) and the conical ring head (15) form an integral structure with a forward-through air guide channel (10) coaxially arranged inside. The tail end of the air guide channel (10) is connected to the air guide pipe (9). Driven by the centrifugal fan, the air guide pipe (9) can input air pressure into the air guide channel (10), thereby causing the air outlet (10a) at the front end of the air guide channel (10) to blow air forward; the inner diameter of the air outlet (10a) at the front end of the air guide channel (10) is between the outer diameter of the wire harness (1) and the outer diameter of the wire harness end (3); It also includes a piston ring (43), the outer ring of the piston ring (43) is in a movable sealing fit with the inner wall of the outer cylinder (4), and the telescoping device (41) can drive the piston ring (43) to slide along the axis of the outer cylinder (4); the inner ring of the piston ring (43) is coaxially and integrally provided with a metal structure ring (16), and the inner diameter of the metal structure ring (16) is larger than the outer diameter of the inner cylinder (17); It also includes a conical annular elastic wall (14) attached to the outer wall of the conical ring head (15) at the front end, and the rear end of the conical annular elastic wall (14) is fixedly and sealed to the inner ring of the metal structure ring (16) along the contour; the front end of the conical annular elastic wall (14) is sealed and integrally connected to the outer edge of the front end of the conical ring head (15) by a ring of epoxy resin adhesive (12); a pressure control chamber (7) is formed between the inner cylinder (17) and the outer cylinder (4) on the rear side of the metal structure ring (16), and a pressure control air pump is formed. The output end is connected to the rear end of the pressure control chamber (7) through the pressure guide pipe (8); an initial slit (18) is formed between the inner wall of the rear section of the conical annular elastic wall (14) and the outer wall of the front end of the inner cylinder (17). The rear end of the initial slit (18) is connected to the pressure control chamber (7). When the pressure in the pressure control chamber (7) increases, the air pressure in the pressure control chamber (7) is pressed forward through the initial slit (18) between the conical annular elastic wall (14) and the outer wall of the conical ring head (15), and the conical annular elastic wall (14) expands outward.

2. The device for handling shielding wire in a wire harness production line according to claim 1, characterized in that: The wire bundle (1) includes the outermost layer of the wire sheath that has been stripped by the wire stripping device. One end of the wire bundle (1) forms a wire bundle end (3) that exposes the inner sheath of the wire bundle. A ring of shielding wire bundles (2) is discretely distributed around the outer periphery of the wire bundle end (3).

3. The device for handling shielding wire in a wire harness production line according to claim 1, characterized in that: It also includes a wire harness clamping manipulator (211) that can clamp the wire harness (1), and the wire harness clamping manipulator (211) displaces the wire harness end (3) of the clamped wire harness (1) to the front of the outer cylinder (4) coaxially.

4. The device for handling shielding wire in a wire harness production line according to claim 3, characterized in that: The conical ring head (15) is located at the middle of the length of the outer cylinder (4).

5. The device for processing shielding wire in a wire harness production line according to claim 4, characterized in that: The conical annular elastic wall (14) is made of elastic silicone or elastic rubber.

6. The working method of the shielding wire turning device in a wire harness production line according to claim 5, characterized in that: Step 1: The wire harness clamping robot (211) moves the wire harness end (3) of the clamped wire harness (1) to the front of the outer cylinder (4) coaxially; the centrifugal fan is controlled, and the air duct (9) inputs air pressure into the air duct (10), so that the air outlet (10a) at the front end of the air duct (10) blows air towards the front axis direction to one end of the wire harness end (3), so that a backward airflow along the axis direction is formed on the circumferential surface of the wire harness end (3), and the shielding layer wire bundle (2) that was originally still attached to the surface of the wire harness end (3) is blown away from the wire harness end (3) by the backward airflow and detached from the circumferential surface of the wire harness end (3); Step 2: Stop the centrifugal fan. The wire harness clamping robot (211) moves backward along the axial direction with the wire harness end (3) of the clamped wire harness (1) until the wire harness end (3) is inserted into the front air outlet (10a) of the air guide channel (10) along the axial direction until the front end of the conical ring head (15) reaches the root of the wire harness end (3). At this time, the shielding layer wire bundle (2) is distributed on the outer periphery of the conical ring elastic wall (14). Step 3: Control the pressure control air pump to increase the pressure inside the pressure control chamber (7). The air pressure inside the pressure control chamber (7) is pushed forward through the starting seam (18) into the space between the conical annular elastic wall (14) and the outer wall of the conical ring head (15), causing the conical annular elastic wall (14) to expand outward and transform into a bulging elastic wall (14a). The shielding layer filaments (2) originally distributed on the outer periphery of the conical annular elastic wall (14) are turned backward around the root under the bulging action of the bulging elastic wall (14a). Step 4: Control the pressure control air pump to restore the pressure in the pressure control chamber (7) to normal pressure, and restore the bulging elastic wall (14a) to the shape of the conical annular elastic wall (14). Step 5. In this step, the pressure control air pump is controlled to keep the pressure in the pressure control chamber (7) at constant pressure. At the same time, the telescopic device (41) drives the piston ring (43) to slide forward along the axis of the outer cylinder (4). The thick end of the conical annular elastic wall (14) moves forward with the piston ring (43) and causes the conical annular elastic wall (14) to gradually separate from the outer wall of the conical ring head (15) from the thick end until the piston ring (43) slides to the front of the outer cylinder (4). The conical annular elastic wall (14) with the thin end facing forward is flipped backward to the thin end facing backward. The conical annular elastic wall (14) is flipped into the second form of the conical annular elastic wall (14b). During the process of the conical annular elastic wall (14) being flipped into the second form of the conical annular elastic wall (14b), the shielding layer wire bundles (2) are further flipped backward. At this time, the shielding layer wire bundles (2) have completely separated from the outer periphery of the wire bundle end (3).

7. The working method of the shielding wire turning device in a wire harness production line according to claim 6, characterized in that: Step six: Control the pressure control air pump to increase the pressure inside the pressure control chamber (7), thereby increasing the pressure on the outer periphery of the second-form conical annular elastic wall (14b). Under the action of the outer periphery air pressure, the second-form conical annular elastic wall (14b) squeezes the shielding layer wire bundles (2) inward, causing the shielding layer wire bundles (2) that have already been flipped back to adhere even more tightly to the outer surface of the unstripped part of the attached wire bundle (1). At this time, the second-form conical annular elastic wall (14b) transforms into the third-form annular elastic wall (14c). Step 7: Control the pressure control air pump to change the pressure in the pressure control chamber (7) from positive pressure to negative pressure, so that the third-form annular elastic wall (14c) expands away from its own axis under the action of the outer ring negative pressure. The third-form annular elastic wall (14c) transforms into the fourth-form annular elastic wall (14d), thereby separating the fourth-form annular elastic wall (14d) from the shielding layer wire bundle (2) on the outer surface of the unstripped part of the wire bundle (1) that has been flipped back and stably attached.

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