Production method of automobile steering wheel heating enameled wire

Abstract

The present invention provides a method for producing an automobile steering wheel heating enameled wire, which relates to the technical field of enameled wire production, and the steps include preparing a wire and a paint solution, respectively performing an appearance inspection and a performance test on the wire and the paint solution; cleaning the surface of the wire with a neutral or weakly alkaline detergent, straightening and aligning the wire, and inspecting the straightness and surface quality of the wire; painting the wire with the aid of a painting mechanism; installing a heating element on the cured enameled wire, and performing a heating test; finally inspecting the surface quality of the enameled wire, and performing an electrical performance test, a heat resistance test, and a wear resistance test on the enameled wire. The method aims to improve the uniformity of the enameled wire painting, reduce site occupation, and reduce the waste of paint solution.

Description

Technical Field

[0001] The invention relates to the technical field of enameled wire production, in particular to a method for producing an automobile steering wheel heating enameled wire and a painting mechanism thereof. Background Art

[0002] In the automotive manufacturing industry, the steering wheel heating function has become one of the important configurations to improve driving comfort. The realization of this function depends on efficient and reliable heating elements and their connection methods. Among them, the heating enameled wire is a key component connecting the heating element and the power supply, and its performance is directly related to the heating efficiency, safety performance and service life. The traditional production method of heating enameled wire has many shortcomings in the painting process, which are mainly reflected in the following two aspects: On the one hand, the traditional method often adopts dipping or spraying, which makes it difficult to ensure that the paint liquid is evenly distributed on the surface of the wire, especially for thin-diameter wires, which are prone to local over-thickness or uncovered, affecting the insulation effect. On the other hand, in order to ensure the uniformity of painting, traditional processes usually require longer production lines and larger working spaces, which not only increases production costs, but also limits the improvement of production flexibility and efficiency. Summary of the invention

[0003] The invention provides a method for producing an automobile steering wheel heating enameled wire, which aims to improve the uniformity of painting, reduce site occupation and reduce waste of paint liquid.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A method for producing an automotive steering wheel heating enameled wire comprises the following steps:

[0005] S1. Raw material preparation and inspection: Prepare the wires and paint solution, and conduct appearance inspection and performance test on the wires and paint solution respectively;

[0006] S2. Wire pretreatment: Use a neutral or weak alkaline detergent to clean the wire surface, straighten and align the wire, and check the wire straightness and surface quality;

[0007] S3, painting and curing: The wire is painted with the help of a painting mechanism, which includes a winding drum, a driving shaft driven to rotate by a motor and respectively fixed to both ends of the winding drum, and a felt wound on the winding drum. When painting, the wire is first wound on the winding drum, and then the felt soaked in paint liquid is wound on the winding drum to ensure that the felt completely wraps the wire. The coating amount of the paint liquid is controlled by adjusting the tightness of the felt and the rotation speed of the winding drum, and then the painted wire is sent to a drying and curing furnace for curing;

[0008] S4. Testing: Install the heating element on the cured enameled wire and conduct a heating test to check the heating effect, temperature distribution uniformity and electrical safety;

[0009] S5. Inspection: Check the surface quality of the enameled wire, and then conduct electrical performance test, heat resistance test and wear resistance test on the enameled wire.

[0010] In some embodiments, the painting mechanism further includes a paint suction box disposed at both ends of the winding drum and used to absorb the paint liquid overflowed during the winding process of the felt;

[0011] The outer surface of the driving shaft is provided with an extrusion wheel and a contact pressure wheel via a connecting rod, and the extrusion wheel and the contact pressure wheel both rotate together with the driving shaft;

[0012] The paint suction box is a long strip hollow shell structure bent into an arch, and is in an inverted "U" shape as a whole. A plurality of electrically controlled paint suction one-way valves are provided on one side close to the winding drum, and a plurality of electrically controlled exhaust one-way valves are provided on the other side. The electrically controlled paint suction one-way valves allow substances to enter the paint suction box but do not allow substances to be discharged, and the electrically controlled exhaust one-way valves allow substances to be discharged from the paint suction box but do not allow substances to enter. A plurality of bulges are provided at the inner bend of the paint suction box, and each of the bulges is connected to the internal space of the paint suction box;

[0013] The inner curved area of ​​the paint suction box is provided with a contact sensing controller for controlling the working states of the electrically controlled paint suction one-way valve and the electrically controlled exhaust one-way valve;

[0014] When the touch-pressure wheel keeps in contact with the inner curved wall of the paint suction box, the extrusion wheel squeezes each of the bulges in turn, and the paint suction box exhausts air outwards through the electrically-controlled exhaust one-way valve and changes to a negative pressure state; when the touch-pressure wheel completely loses contact with the paint suction box, the paint suction box absorbs paint inwards through the electrically-controlled paint suction one-way valve to achieve internal and external pressure balance.

[0015] In some embodiments, a plurality of electric telescopic rods are arranged in a circular array at the end of the driving shaft. The electric telescopic rods can be telescopically adjusted along the radial direction of the driving shaft, and the telescopic ends of each electric telescopic rod can together support the inner wall of the winding drum.

[0016] In some embodiments, the telescopic movable end of each electric telescopic rod is provided with a top block, and the top block is an arc-shaped plate structure adapted to the shape of the inner wall of the winding drum, and the arc surface of the top block is provided with an anti-slip texture.

[0017] In some embodiments, the bottom support of the paint suction box is provided with a lifting platform, and the lifting platform can drive the paint suction box to move up and down.

[0018] In some embodiments, the paint suction box is provided with a plurality of paint discharge ports.

[0019] In some embodiments, a flow control valve is provided at the paint discharge port.

[0020] In some embodiments, a heating element is further provided in the paint suction box.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] By adopting a painting mechanism combining a winding drum and felt, the present invention realizes accurate winding and uniform painting of the conductor. The good water absorption and controllable tightness of the felt ensure that the paint liquid can evenly penetrate and adhere to the surface of the conductor, effectively avoiding the problem of local over-thickness or uncovering in the traditional method, and improving the overall quality of the insulation layer.

[0023] The painting method of the present invention does not require a long production line, and only requires a compact painting mechanism to complete the painting process, which significantly reduces the demand for production space, improves production efficiency and flexibility, and is particularly suitable for small and medium-sized enterprises with limited space or production line renovation and upgrading. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the overall structure of the painting mechanism used in the method of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the winding drum of the painting mechanism used in the method of the present invention during the process of being wound by the felt;

[0026] Figure 3 A schematic diagram of the structure of the driving shaft of the painting mechanism used in the method of the present invention and various components installed thereon;

[0027] Figure 4 A schematic diagram of the structure of the paint suction box of the paint application mechanism used in the method of the present invention and the components installed thereon (viewing angle 1);

[0028] Figure 5 A schematic diagram of the structure of the paint suction box of the paint application mechanism used in the method of the present invention and the components installed thereon (viewing angle 2);

[0029] Figure 6 The present invention is a schematic structural diagram of the drive shaft of the painting mechanism used in the method of the present invention and the paint suction box after being assembled.

[0030] In the figure: 1, winding drum; 2, felt; 3, driving shaft; 301, electric telescopic rod; 302, top block; 303, connecting rod; 304, extrusion wheel; 305, contact pressure wheel; 4, paint suction box; 401, electric control paint suction one-way valve; 402, electric control exhaust one-way valve; 403, bulge; 404, paint discharge port. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] This embodiment provides a method for producing an automotive steering wheel heating enameled wire, comprising the following steps:

[0036] S1. Raw materials preparation and inspection:

[0037] Use high-purity copper or copper alloy as the conductor material, such as oxygen-free copper, copper-magnesium alloy, etc. The wire diameter range is determined according to specific needs, such as 0.1mm to 2.0mm, to ensure that it has good conductivity and low resistivity and meets the electrical requirements of the automotive steering wheel heating system. Perform an appearance inspection on the wire to ensure that there are no cracks, breaks or rust;

[0038] Choose paint liquid with high temperature resistance, wear resistance and excellent insulation performance as the insulation layer material, such as polyurethane paint, polyester paint or polyimide paint, etc., and select it according to the temperature resistance level and insulation requirements. Ensure that the paint liquid is free of impurities, has moderate viscosity, is easy to apply evenly, and is easy to penetrate and level. Perform performance tests on the paint liquid, including viscosity, curing time, heat resistance, etc., to ensure that all raw materials meet production standards;

[0039] S2. Wire pretreatment:

[0040] Clean the wire surface with a detergent, including but not limited to surfactants, water, alcohols, etc. Neutral detergents or weak alkaline detergents should be used, and strong acid and alkaline detergents should be avoided to prevent corrosion of the wire surface. They are used to remove oil, dust and other impurities on the wire surface to ensure that the wire surface is clean and smooth before painting;

[0041] Straighten and align the wires to ensure that the wires will not be bent or twisted during subsequent processing, which will affect the painting effect and product quality. A straightening machine can be used to straighten and align the wires. The straightening tension is determined according to the wire specifications and materials to avoid excessive stretching that may cause wire breakage or deformation. After straightening, check the wire straightness and surface quality.

[0042] S3, painting and curing:

[0043] The wire is painted with the help of a painting mechanism, which includes a winding drum 1, a driving shaft 3 driven to rotate by a motor and respectively fixed to both ends of the winding drum 1, and a felt 2 wound on the winding drum 1. When painting, the cleaned wire must be wound on the winding drum 1 first, and only one layer should be wound, and each turn of the wire on the winding drum 1 should be arranged at intervals;

[0044] Choose a felt 2 material with good water absorption, soak it in the paint liquid, squeeze out the excess paint liquid, and ensure that the surface of the felt 2 is moist and there is no obvious dripping;

[0045] The felt 2 is wound on the winding drum 1, and it is ensured that the impregnated felt 2 is evenly wrapped on the conductor. The coating amount of the paint liquid is controlled by adjusting the tightness of the felt 2 and the rotation speed of the winding drum 1. During the painting process, the uniformity and thickness of the paint liquid coating are regularly checked to see if they meet the requirements. The good water absorption and controllable tightness of the felt 2 ensure that the paint liquid can evenly penetrate and adhere to the surface of the conductor, effectively avoiding the problem of local over-thickness or uncovering in the traditional method, and improving the overall quality of the insulation layer. In addition, such winding and painting greatly reduces the site space required for the painting process, and after the conductor is kept in a wound state for a long time, it can be slightly shaped, which is conducive to the later storage and secondary winding and packaging of the conductor.

[0046] Then, the painted wires are sent to the drying and curing furnace. The curing temperature, time and atmosphere are set according to the type of paint liquid. During the curing process, the furnace temperature uniformity and the curing state of the wires are regularly checked to ensure the curing quality.

[0047] S4. Test:

[0048] Install the heating element on the cured enameled wire according to the design requirements to ensure good contact and thermal conductivity between the heating element and the wire. It is best to use insulating materials to fix and encapsulate the heating element to avoid short circuit and leakage risks;

[0049] Conduct heating test on the enameled wire with heating elements installed to check heating effect, temperature distribution uniformity and electrical safety. During the test, record data such as heating time, temperature change and power consumption to ensure that the product meets the design requirements.

[0050] S5. Inspection:

[0051] Check whether the surface of the enameled wire is smooth and free of defects such as cracks, peeling or bubbles. Perform electrical performance tests, such as resistance value, insulation resistance, and withstand voltage strength. Perform heat resistance tests, such as testing the insulation performance and mechanical strength of the enameled wire in a high temperature environment. Perform wear resistance tests, such as simulating the wear conditions during actual use to test the durability of the enameled wire.

[0052] In some embodiments, Figure 1-6 As shown, the painting mechanism also includes a paint suction box 4 which is arranged at both ends of the winding drum 1 and is used to absorb the paint liquid overflowing during the winding process of the felt 2. When performing the painting process, it is necessary to first wind the wire on the winding drum 1, and then wind the felt 2 soaked in paint liquid on the winding drum 1, and ensure that the felt 2 completely covers the wire. After that, as the felt 2 is tightened, wait for the paint liquid in the felt 2 to soak into the wire, thereby achieving wire painting.

[0053] The outer surface of the driving shaft 3 is provided with an extrusion wheel 304 and a contact pressure wheel 305 via a connecting rod 303, and the extrusion wheel 304 and the contact pressure wheel 305 both rotate together with the driving shaft 3;

[0054] The paint suction box 4 is a long strip hollow shell structure bent into an arch, and the whole is in an inverted "U" shape. A plurality of electrically controlled paint suction one-way valves 401 are provided on one side close to the winding drum 1, and a plurality of electrically controlled exhaust one-way valves 402 are provided on the other side. The electrically controlled paint suction one-way valves 401 allow substances to enter the paint suction box 4, but do not allow substances to be discharged from the paint suction box 4. The electrically controlled exhaust one-way valves 402 allow substances to be discharged from the paint suction box 4, but do not allow substances to enter the paint suction box 4. In addition, a plurality of bulges 403 are provided at the inner bend of the paint suction box 4, and each bulge 403 is connected to the internal space of the paint suction box 4.

[0055] The inner side of the curved portion of the paint suction box 4 is its inner curved area, and the arc-shaped wall surface of this area is the inner curved wall. The extrusion wheel 304 and the contact pressure wheel 305 will pass through the inner curved area of ​​the paint suction box 4 during the process of rotating with the driving shaft 3. When the extrusion wheel 304 and the contact pressure wheel 305 pass through the inner curved area of ​​the paint suction box 4, the extrusion wheel 304 will squeeze each bulge 403 in turn, and the contact pressure wheel 305 will always keep in contact with the inner curved wall of the paint suction box 4. When the extrusion wheel 304 and the contact pressure wheel 305 are both moved to outside the inner curved area of ​​the paint suction box 4, the extrusion wheel 304 will no longer squeeze the bulge 403, and the contact pressure wheel 305 will also completely break away from the contact with the paint suction box 4.

[0056] A contact sensing controller is provided on the inner curved wall of the paint suction box 4. When the touch-pressure wheel 305 keeps in contact with the inner curved wall of the paint suction box 4, the contact sensing controller will control the electrically-controlled paint suction one-way valve 401 to keep in a two-way closed state, and at the same time control the electrically-controlled exhaust one-way valve 402 to keep in a normal one-way working state. When the touch-pressure wheel 305 is completely out of contact with the paint suction box 4, the contact sensing controller will control the electrically-controlled paint suction one-way valve 401 to keep in a normal one-way working state, and at the same time control the electrically-controlled exhaust one-way valve 402 to keep in a two-way closed state.

[0057] By means of the above technical scheme, when the contact and pressure wheel 305 keeps contact with the inner curved wall of the paint suction box 4, the squeezing wheel 304 will squeeze each bulge 403 in turn. At this time, since the electrically-controlled paint suction one-way valve 401 keeps a two-way closed state and the electrically-controlled exhaust one-way valve 402 keeps a normal one-way working state, the paint suction box 4 will continuously exhaust air outwards through each electrically-controlled exhaust one-way valve 402, and the interior of the paint suction box 4 will also change from normal atmospheric pressure to negative pressure state. With the rotation of the drive shaft 3, when the contact and pressure wheel 305 is completely out of contact with the paint suction box 4, the squeezing wheel 304 The bulge 403 will no longer be squeezed. At this time, since the electrically controlled paint suction one-way valve 401 maintains a normal one-way working state and the electrically controlled exhaust one-way valve 402 maintains a two-way closed state, the paint suction box 4 will continuously suck paint inward through each electrically controlled paint suction one-way valve 401 to achieve internal and external pressure balance. During the rotation of the drive shaft 3, the winding process is also in progress. During this period, the excess paint liquid squeezed out during the winding process of the felt 2 is fully absorbed by the paint suction box 4, achieving effective collection of excess paint liquid and greatly reducing the waste of paint liquid in the felt 2 winding painting process. In the above process, the drive shaft 3 rotates at a high speed, so the switching speed of the contact pressure wheel 305 between the inner bending area and the non-inner bending area of ​​the paint suction box 4 is extremely fast, so the negative pressure generation speed and paint suction speed of the paint suction box 4 are also extremely fast, which can achieve efficient and high-speed paint suction.

[0058] In some embodiments, Figure 3As shown, the end of the driving shaft 3 is provided with a plurality of electric telescopic rods 301 arranged in a circular array, each electric telescopic rod 301 can be telescopically adjusted along the radial direction of the driving shaft 3, and the telescopic ends of each electric telescopic rod 301 can support the inner wall of the winding drum 1 together to achieve the fixation of the winding drum 1. In this way, no matter how the size of the winding drum 1 changes, a tight and stable fixation effect can be achieved. This design not only improves the compatibility of the painting mechanism, but also further ensures the stability of the winding drum 1 during the painting process, avoiding uneven painting or wire damage caused by loosening or deviation of the winding drum 1.

[0059] In some embodiments, Figure 3 As shown, the telescopic movable end of each electric telescopic rod 301 is provided with a top block 302, and the top block 302 is an arc-shaped plate structure adapted to the shape of the inner wall of the winding drum 1, and the arc surface of the top block 302 is provided with an anti-slip texture. The arc-shaped plate structure of the top block 302 can better fit the inner wall of the winding drum 1, increase the contact area, thereby improving the stability and reliability of the fixation, and the setting of the anti-slip texture further enhances the friction between the top block 302 and the inner wall of the winding drum 1, effectively preventing the winding drum 1 from loosening or slipping due to vibration or external force during the painting process, thereby ensuring the uniformity of the painting and the integrity of the wire.

[0060] In some embodiments, the bottom support of the paint suction box 4 is provided with a lifting platform, which can drive the paint suction box 4 to move up and down to adapt to the winding drum 1 of different diameters. The design of the lifting platform allows the position of the paint suction box 4 to be flexibly adjusted according to the diameter of the winding drum 1. When processing the winding drum 1 of different diameters, by adjusting the height of the lifting platform, it can be ensured that the inner bending area of ​​the paint suction box 4 and the extrusion wheel 304 and the touch pressure wheel 305 on the drive shaft 3 maintain the appropriate relative position. In this way, no matter how the diameter of the winding drum 1 changes, the extrusion wheel 304 can accurately squeeze the bulge 403 in the paint suction box 4, and the touch pressure wheel 305 can also always keep in contact with the inner bending wall of the paint suction box 4, thereby ensuring that the negative pressure generation and paint suction function of the paint suction box 4 are not affected. At the same time, since the lifting platform can ensure the proper coordination between the extrusion wheel 304 and the touch pressure wheel 305 on the paint suction box 4 and the drive shaft 3, the stability and reliability during the painting process are also further improved. In addition, the design of the lifting platform also takes into account the convenience of operation, allowing operators to easily adjust and maintain it, thereby reducing the difficulty of operation and skill requirements.

[0061] In some embodiments, Figure 4As shown in Figure 5, the paint suction box 4 is provided with a plurality of paint discharge ports 404, through which the paint discharge ports 404 are convenient for concentrated discharge of the paint liquid. When the paint suction box 4 absorbs excess paint liquid through the electrically controlled paint suction one-way valve 401, the paint liquid will accumulate inside the paint suction box 4. As the paint liquid accumulates, the operator can open or adjust the paint discharge ports 404 to discharge the paint liquid in a concentrated and orderly manner, thereby avoiding the retention and accumulation of the paint liquid inside the paint suction box 4, thereby maintaining the continuous and efficient operation of the paint suction box 4. The design of the paint discharge ports 404 helps to keep the paint suction box 4 clean and hygienic. Regularly discharging the paint liquid through the paint discharge ports 404 can effectively avoid the problems of deterioration and odor caused by the long-term retention of the paint liquid inside the paint suction box 4, thereby extending the service life of the paint suction box 4 and improving the overall performance of the painting mechanism.

[0062] In some embodiments, Figure 4 As shown in Figure 5, a flow control valve is provided at the paint discharge port 404, and the flow control valve is used to adjust and control the flow rate and speed of the paint liquid discharged from the paint discharge port 404. The setting of the flow control valve further enhances the functionality and practicality of the paint discharge port 404. By accurately adjusting the opening of the flow control valve, the operator can flexibly control the flow rate of the paint liquid discharged from the paint discharge port 404, ensuring that the discharge of the paint liquid is both efficient and controllable. This design not only avoids splashing or waste of the paint liquid due to excessive discharge, but also makes the entire paint discharge process more stable and continuous, which helps to improve the neatness and efficiency of the painting process.

[0063] In some embodiments, a heating element is also provided in the paint suction box 4, which is used to heat the paint liquid in the paint suction box 4 to maintain the fluidity and temperature stability of the paint liquid. Through such a design, it is possible to effectively prevent the paint liquid from solidifying or becoming viscous due to the low temperature in the paint suction box 4, and ensure that the paint liquid can be smoothly sucked into the paint suction box 4 through the electric control paint suction one-way valve 401, and smoothly discharged through the paint discharge port 404. This not only improves the working efficiency and reliability of the paint suction box 4, but also can avoid equipment failure or production interruption caused by the solidification or viscosity of the paint liquid, further ensuring the production efficiency and product quality of the manufacturing device. At the same time, the setting of the heating element can also be adjusted and controlled according to actual needs to adapt to different types of paint liquid and production process requirements, thereby enhancing the applicability and flexibility of the manufacturing device.

[0064] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A method for producing automotive steering wheel heating enameled wire, characterized in that: The following steps are involved: S1. Raw material preparation and inspection: Prepare the wires and paint solution, and conduct appearance inspection and performance test on the wires and paint solution respectively; S2. Wire pretreatment: Use a neutral or weak alkaline detergent to clean the wire surface, straighten and align the wire, and check the wire straightness and surface quality; S3, painting and curing: the wire is painted with the aid of a painting mechanism, the painting mechanism comprising a winding drum (1), a driving shaft (3) driven to rotate by a motor and respectively fixed to both ends of the winding drum (1), and a felt (2) wound on the winding drum (1). When painting, the wire is firstly wound on the winding drum (1), and then the felt (2) soaked in paint liquid is wound on the winding drum (1) to ensure that the felt (2) completely wraps the wire. The coating amount of the paint liquid is controlled by adjusting the tightness of the felt (2) and the rotation speed of the winding drum (1), and then the painted wire is sent to a drying and curing furnace for curing; S4. Testing: Install the heating element on the cured enameled wire and conduct a heating test to check the heating effect, temperature distribution uniformity and electrical safety; S5. Inspection: Check the surface quality of the enameled wire, and then conduct electrical performance test, heat resistance test and wear resistance test on the enameled wire.

2. The method for producing automotive steering wheel heating enameled wire according to claim 1, characterized in that: The painting mechanism further comprises a paint suction box (4) which is arranged at both ends of the winding drum (1) and is used to absorb the paint liquid overflowing during the winding process of the felt (2); The outer surface of the driving shaft (3) is provided with an extrusion wheel (304) and a contact pressure wheel (305) via a connecting rod (303), and the extrusion wheel (304) and the contact pressure wheel (305) both rotate together with the driving shaft (3); The paint suction box (4) is a long strip hollow shell structure bent into an arch shape, and is in an inverted "U" shape as a whole. A plurality of electrically controlled paint suction one-way valves (401) are provided on one side close to the winding drum (1), and a plurality of electrically controlled exhaust one-way valves (402) are provided on the other side. The electrically controlled paint suction one-way valves (401) allow substances to enter the paint suction box (4) but do not allow substances to be discharged. The electrically controlled exhaust one-way valves (402) allow substances to be discharged from the paint suction box (4) but do not allow substances to enter. A plurality of bulges (403) are provided at the inner bend of the paint suction box (4), and each of the bulges (403) is connected to the internal space of the paint suction box (4); The inner curved area of ​​the paint suction box (4) is provided with a contact sensing controller for controlling the working states of the electrically controlled paint suction one-way valve (401) and the electrically controlled exhaust one-way valve (402); When the contact and pressure wheel (305) maintains contact with the inner curved wall of the paint suction box (4), the extrusion wheel (304) squeezes each of the bulges (403) in sequence, and the paint suction box (4) exhausts air outwards through the electrically controlled exhaust one-way valve (402) and changes to a negative pressure state. When the contact and pressure wheel (305) is completely out of contact with the paint suction box (4), the paint suction box (4) absorbs paint inwards through the electrically controlled paint suction one-way valve (401) to achieve internal and external pressure balance.

3. The method for producing automotive steering wheel heating enameled wire according to claim 1, characterized in that: A plurality of electric telescopic rods (301) are arranged in a ring array at the end of the driving shaft (3); the electric telescopic rods (301) can be telescopically adjusted along the radial direction of the driving shaft (3), and the telescopic ends of the electric telescopic rods (301) can together support the inner wall of the winding drum (1).

4. The method for producing an automotive steering wheel heating enameled wire according to claim 3, characterized in that: The telescopic movable end of each electric telescopic rod (301) is provided with a top block (302), the top block (302) is an arc-shaped plate structure adapted to the shape of the inner wall of the winding drum (1), and the arc surface of the top block (302) is provided with an anti-slip texture.

5. The method for producing automotive steering wheel heating enameled wire according to claim 2, characterized in that: The bottom support of the paint suction box (4) is provided with a lifting platform, and the lifting platform can drive the paint suction box (4) to move up and down.

6. The method for producing automotive steering wheel heating enameled wire according to claim 2, characterized in that: The paint suction box (4) is provided with a plurality of paint discharge ports (404).

7. The method for producing an automotive steering wheel heating enameled wire according to claim 6, characterized in that: A flow control valve is provided at the paint discharge port (404).

8. The method for producing automotive steering wheel heating enameled wire according to claim 2, characterized in that: A heating element is also provided in the paint suction box (4).

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