Wire silica gel cladding extrusion molding method

Abstract

The invention relates to the technical field of wires, discloses a wire silica gel cladding extrusion molding method, and provides a molding machine which comprises a pay-off structure, a take-up structure, a machine head and a curing structure. A wire passing channel and a glue feeding channel are arranged in the machine head, and a wire is provided with a processing section; liquid silica gel continuously enters the gel inlet channel and flows into the wire passing channel; in the upward longitudinal transmission process of the processing section in the wire passing channel, the liquid silica gel wraps the periphery of the processing section to form a silica gel wrapping layer, and the processing section wrapped with the silica gel wrapping layer forms a rubber wrapping section; in the process that the rubber coating section continues to move upwards and longitudinally, the silica gel coating layer is downwards, longitudinally and naturally leveled under the action of gravity, so that the periphery of the wire is uniformly coated with the silica gel coating layer, and the thickness of the silica gel coating layer is smaller than the set thickness; by means of the fluidity of the liquid silica gel, the silica gel wrapping layer can naturally level downwards under the action of gravity, so that the silica gel wrapping layer can evenly wrap the periphery of the wire rod, and the thickness of the silica gel wrapping layer is smaller than the set thickness.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of wire materials, and specifically, to a method for extrusion molding of silicone coating of wire materials. Background Art

[0002] Wires are widely used in daily life, such as various cables and data cables. At present, during the manufacturing process of wires, a silicone coating needs to be formed on the outside to meet the requirements of insulation, temperature resistance, softness, etc.

[0003] In the prior art, an extrusion molding method is generally used to form a silicone coating on the wire. However, in the traditional process, the thickness of the silicone coating formed on the wire is difficult to meet the requirements, the thickness is often too large, and the uniformity of the silicone coating is poor. Summary of the invention

[0004] The object of the present invention is to provide a wire silicone coating extrusion molding method, aiming to solve the problem of poor uniformity of the silicone coating formed on the wire in the prior art.

[0005] The present invention is implemented in this way. A wire silicone coating extrusion molding method provides a molding machine, the molding machine includes a wire-releasing structure and a wire-receiving structure for winding the wire, a machine head and a curing structure are arranged between the wire-releasing structure and the wire-receiving structure; a wire-passing path and a glue-feeding path for the wire to pass through are arranged in the machine head, the wire-passing path is arranged longitudinally, the glue-feeding path is connected with the wire-passing path, and the curing structure is arranged above the machine head along the transmission direction of the wire;

[0006] The wire is unidirectionally transmitted between the wire-releasing structure and the wire-receiving structure, and the wire has a processing section passing through the wire passage; the liquid silicone continuously enters the rubber inlet passage and flows into the wire passage; during the upward longitudinal transmission of the processing section in the wire passage, the liquid silicone wraps around the outer periphery of the processing section to form a silicone coating, and the processing section wrapped with the silicone coating forms a rubber-coated section;

[0007] After the rubber-coated section moves upwards away from the wire passage, the silicone coating naturally flows downwards longitudinally under the action of gravity during the process of continuing to move longitudinally upwards, so that the silicone coating is evenly wrapped around the outer periphery of the wire, and the thickness of the silicone coating is less than the set thickness;

[0008] The rubber-coated section after natural leveling enters the curing structure, and the thin layer of silicone is cured and wrapped around the periphery of the wire. The cured rubber-coated section is rolled up in the wire-receiving structure through transmission.

[0009] Furthermore, the molding machine includes a feeding system connected to the glue feeding channel, and the feeding system includes multiple feeders. According to the formula of the liquid silicone, the multiple feeders respectively provide set amounts of raw materials. The raw materials provided by the multiple feeders are stirred and mixed to form the liquid silicone, and the liquid silicone is supplied to the feeding channel.

[0010] Furthermore, the curing structure includes an oven having a longitudinally arranged curing channel, a heating structure being provided on the periphery of the curing channel, and the heating structure is heated to make the temperature in the curing channel higher than a set temperature; the rubber-coated section enters the curing channel after natural leveling, and the silicone coating is heated and cured during the process of the rubber-coated section being longitudinally transmitted upward in the curing channel.

[0011] Furthermore, the rubber inlet channel includes a longitudinal section arranged longitudinally and a transverse section arranged transversely, the top of the longitudinal section has a feed port for liquid silicone to enter, the bottom of the transverse section is connected to the inner section of the transverse section by bending, and the outer end of the transverse section is connected to the wire channel to form a discharge port;

[0012] The liquid silicone enters the feed channel through the feed port, and the liquid silicone in the feed channel enters the wire channel through the discharge port, and is wrapped around the outer periphery of the moving processing section to form the silicone coating.

[0013] Furthermore, there is an empty leveling area between the wire passage and the curing structure, and the rubber-coated section coming out of the wire passage moves longitudinally upward in the leveling area, and the silica gel coating naturally levels longitudinally downward under the action of gravity.

[0014] Furthermore, the leveling area is provided with a wire diameter gauge, and the wire diameter gauge measures the outer diameter of the rubber-encapsulated section.

[0015] Furthermore, a wire-paying weight wheel is provided between the wire-paying structure and the machine head, and the wire paid out by the wire-paying structure is wound on the wire-paying weight wheel, and the wire-paying weight wheel is respectively located below the wire-paying structure and the machine head.

[0016] Furthermore, a wire-receiving counterweight wheel is provided between the machine head and the wire-receiving structure, and the rubber-coated section cured by the curing structure is wound on the wire-receiving counterweight wheel, and the wire-receiving counterweight wheel is respectively located below the wire-receiving structure and the curing structure.

[0017] Furthermore, a traction wheel is provided between the take-up counterweight wheel and the curing structure, and the rubber-coated section cured by the curing structure is wound around the traction wheel, and the traction wheel pulls the rubber-coated section and transmits it to the take-up counterweight wheel.

[0018] Furthermore, a longitudinally arranged mesh cylinder is provided in the curing channel, the mesh cylinder is coaxially arranged with the curing channel, the curing channel has an internal cavity surrounded by the mesh cylinder, and an external cavity surrounding the outer periphery of the mesh cylinder, and the rubber-coated section is longitudinally penetrated in the internal cavity;

[0019] The top and bottom of the internal cavity are arranged in a closed manner, the top of the internal cavity is provided with a plurality of air inlets, the bottom of the internal cavity is provided with a plurality of air outlets, and the plurality of air inlets and the plurality of air outlets are respectively arranged around the circumference of the separation net cylinder; the separation net cylinder is provided with a plurality of mesh holes, and the internal cavity is connected with the external cavity through the plurality of mesh holes;

[0020] A plurality of heating tubes are arranged in the inner cavity, the heating tubes are wrapped around the screen cylinder, and the plurality of heating tubes are arranged at intervals along the axial direction of the screen cylinder; along the screen cylinder from top to bottom, the diameter of the screen cylinder gradually increases;

[0021] The plurality of heating tubes are heated to make the temperature in the inner cavity reach a set temperature. During the process of the rubber-encapsulated section moving upward longitudinally in the inner cavity, the plurality of air inlets blow gas downwardly, and the gas flows downward longitudinally and is discharged from the air extraction port.

[0022] The gas in the external cavity in axial flow enters the internal cavity through the mesh and flows longitudinally downward in the internal cavity, so that the silica gel coating is synchronously leveled by the gas driven airflow during the curing process of the silica gel coating in the curing channel.

[0023] Compared with the prior art, the wire silicone coating extrusion molding method provided by the present invention arranges a wire pay-off structure and a wire take-up structure to enable the wire pay-out transmission and the rubber-coated section to be wound up; since the wire pass is arranged longitudinally and the rubber-coated section is longitudinally transmitted between the wire pass and the curing structure, the fluidity of the liquid silicone is utilized, and the silicone coating can naturally flow downward under the action of gravity, so that the silicone coating can be evenly wrapped around the outer periphery of the wire, and the thickness of the silicone coating is less than the set thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the wire silicone cladding extrusion molding equipment provided by the present invention;

[0025] Figure 2 is an internal schematic diagram of the handpiece provided by the present invention;

[0026] Figure 3 It is an internal schematic diagram of the curing channel provided by the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0029] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Reference Figure 1-3 The figure shows a preferred embodiment of the present invention.

[0031] The wire silicone coating extrusion molding method is used to wrap the silicone coating around the periphery of the wire 401 and solidify the silicone coating.

[0032] A forming machine is provided, which includes a wire-paying structure 100 and a wire-taking structure 200 for winding a wire 401, a machine head 300 and a curing structure 500 are arranged between the wire-paying structure 100 and the wire-taking structure 200; a wire passage 301 and a glue feed passage for the wire 401 to pass through are provided in the machine head 300, the wire passage 301 is arranged longitudinally, the glue feed passage is connected to the wire passage 301, and the curing structure 500 is arranged above the machine head 300 along the transmission direction of the wire 401.

[0033] The wire 401 is unidirectionally transmitted between the wire-releasing structure 100 and the wire-receiving structure 200, and the wire 401 has a processing section passing through the wire passage 301; the liquid silicone continuously enters the rubber inlet passage and flows into the wire passage 301; during the upward longitudinal transmission of the processing section in the wire passage 301, the liquid silicone wraps around the outer periphery of the processing section to form a silicone coating, and the processing section wrapped with the silicone coating forms a rubber-coated section 402;

[0034] After the rubber-coated section 402 moves upward and away from the wire passage 301, the silicone coating naturally flows downward and vertically under the action of gravity during the process of continuing to move upward and vertically, so that the silicone coating is evenly wrapped around the outer periphery of the wire 401, and the thickness of the silicone coating is less than the set thickness;

[0035] The naturally leveled rubber-coated section 402 enters the curing structure 500, and the silicone thin layer is cured and wrapped around the outer periphery of the wire 401. The cured rubber-coated section 402 is rolled up in the wire-receiving structure 200 through transmission.

[0036] In actual processing, the wire 401 is released from the wire-paying structure 100 and is wrapped with a silicone coating through the transmission and the wire-passing channel 301 to form a rubber-coated section 402. After the silicone coating is leveled by gravity, it enters the curing structure 500. In the curing structure 500, the silicone thin layer is cured. The cured rubber-coated section 402 is rolled up on the wire-taking structure 200 through the transmission.

[0037] The wire silicone coating extrusion molding method provided above arranges a wire pay-out structure 100 and a wire take-up structure 200 so that the wire 401 is paid out and the rubber-coated section 402 is wound up; since the wire path 301 is arranged longitudinally and the rubber-coated section 402 is longitudinally transmitted between the wire path 301 and the curing structure 500, the fluidity of the liquid silicone is utilized, and the silicone coating can naturally flow downward under the action of gravity, so that the silicone coating can be evenly wrapped around the outer periphery of the wire 401, and the thickness of the silicone coating is less than the set thickness.

[0038] In addition, during the gravity leveling of the silicone coating in a natural state, the liquid silicone can adhere to the wire 401 through its own adhesion force, and the degree of gravity leveling of the silicone coating can be controlled by controlling the adhesion of the liquid silicone to meet the requirements of thickness control and uniformity control of the silicone coating.

[0039] The wire silicone coating extrusion molding method provided in this embodiment can meet the requirement that the thickness of the silicone coating is less than 0.25 and at the same time control the uniformity of the silicone coating to be higher than 80%.

[0040] In this embodiment, the molding machine includes a feeding system 600 connected to the glue feeding channel, and the feeding system 600 includes multiple feeders 601. According to the formula of the liquid silicone, the multiple feeders 601 respectively provide set amounts of raw materials. The raw materials provided by the multiple feeders 601 are stirred and mixed to form liquid silicone, and the liquid silicone is supplied to the feeding channel.

[0041] By arranging the feeding system 600, online batching and online feeding can be achieved according to the formula of the liquid silicone, which greatly improves the molding efficiency. Secondly, the adhesion of the liquid silicone can be adjusted online according to the uniformity and thickness of the silicone coating.

[0042] In this embodiment, the curing structure 500 includes an oven having a longitudinally arranged curing channel. A heating structure is provided on the periphery of the curing channel. The heating structure heats the curing channel to make the temperature in the curing channel higher than the set temperature. The rubber-coated section 402 enters the curing channel after natural leveling. During the upward longitudinal transmission of the rubber-coated section 402 in the curing channel, the silicone coating is heated and cured.

[0043] The curing channel is arranged longitudinally and coaxially with the wire passage 301, so as to facilitate the rubber encapsulation section 402 to enter the curing channel and facilitate the arrangement of the curing channel.

[0044] In this embodiment, the glue inlet channel includes a longitudinal section 603 arranged longitudinally and a transverse section 604 arranged transversely. The top of the longitudinal section 603 has a feed port for liquid silicone to enter. The bottom of the transverse section 604 is connected to the inner section of the transverse section 604 in a curved manner. The outer end of the transverse section 604 is connected to the wire channel 301 to form a discharge port.

[0045] The liquid silicone enters the feed channel through the feed port, and the liquid silicone in the feed channel enters the wire channel 301 through the discharge port, and wraps around the outer periphery of the moving processing section to form a silicone coating.

[0046] After the liquid silicone enters the longitudinal section 603 through the feed port, the gravity of the liquid silicone accelerates the liquid silicone to enter the transverse section 604. The liquid silicone flows transversely in the transverse section 604, so that it can wrap the periphery of the processing section transversely, avoiding uneven wrapping of the periphery of the processing section, so as to ensure that the silicone coating formed in the wire pass 301 is highly uniform.

[0047] In this embodiment, the diameter of the longitudinal section 603 is smaller than the diameter of the transverse section 604, so that the liquid silicone can enter at high speed through the feed port. When the liquid silicone flows in the transverse section 604 toward the wire channel 301, it is in a filling buffer flow to ensure that the liquid silicone can wrap the periphery of the entire processing section.

[0048] In this embodiment, there is an empty leveling area 700 between the wire passage 301 and the curing structure 500. The rubber-coated section 402 coming out of the wire passage 301 moves vertically upward in the leveling area 700, and the silicone coating naturally levels vertically downward under the action of gravity.

[0049] By arranging the leveling area 700, when the rubber-coated section 402 is separated from the wire-passing channel 301, the rubber-coated section 402 enters the leveling area 700 and flows longitudinally upward in the leveling area 700 to increase the height range of gravity leveling of the silicone coating. The upward longitudinal transmission in the leveling area 700 can achieve better gravity leveling, so that the uniformity of the silicone coating is better and the set thickness is achieved.

[0050] In this embodiment, the leveling area 700 is provided with a wire diameter gauge, which measures the outer diameter of the rubber-coated section 402. In this way, the outer diameter of the rubber-coated section 402 can be monitored in real time by the wire diameter gauge, so as to obtain the thickness of the silicone coating. By monitoring the thickness of the silicone coating with the wire diameter gauge, it can be ensured that the thickness of the silicone coating entering the curing channel meets the set thickness.

[0051] In this embodiment, a wire-paying weight wheel 101 is provided between the wire-paying structure 100 and the machine head 300, and the wire 401 paid out by the wire-paying structure 100 is wound on the wire-paying weight wheel 101, and the wire-paying weight wheel 101 is respectively located below the wire-paying structure 100 and the machine head 300. By adjusting the wire-paying weight wheel 101, the transmission tension of the wire 401 can be adjusted to meet the requirement that the wire 401 is kept in a straightened state for transmission.

[0052] In this embodiment, a wire-receiving counterweight wheel 201 is provided between the machine head 300 and the wire-receiving structure 200, and the rubber-coated section 402 cured by the curing structure 500 is wound on the wire-receiving counterweight wheel 201, and the wire-receiving counterweight wheel 201 is respectively located below the wire-receiving structure 200 and the curing structure 500.

[0053] By adjusting the take-up counterweight wheel 201 , the transmission tension of the rubber-coated section 402 can be adjusted to ensure the straightening transmission of the rubber-coated section 402 , so that the rubber-coated section 402 can be better wound up in the take-up structure 200 .

[0054] In this embodiment, a traction wheel 202 is provided between the take-up counterweight wheel 201 and the curing structure 500, and the rubber-coated section 402 cured by the curing structure 500 is wound around the traction wheel 202, and the traction wheel 202 pulls the rubber-coated section 402 to be transmitted to the take-up counterweight wheel 201. By arranging the traction wheel 202, the transmission of the rubber-coated section 402 can be better pulled.

[0055] In this embodiment, a longitudinally arranged mesh tube 503 is provided in the curing channel. The mesh tube 503 is coaxially arranged with the curing channel. The curing channel has an internal cavity 502 surrounded by the mesh tube 503 and an external cavity 501 surrounding the outer periphery of the mesh tube 503. The rubber-coated section 402 is longitudinally penetrated in the internal cavity 502.

[0056] The top and bottom of the internal cavity 502 are closed, the top of the internal cavity 502 is provided with multiple air inlets, the bottom of the internal cavity 502 is provided with multiple air outlets, and the multiple air inlets and the multiple air outlets are respectively arranged around the circumference of the partition mesh tube 503; the partition mesh tube 503 is provided with multiple mesh holes, and the internal cavity 502 is connected with the external cavity 501 through the multiple mesh holes.

[0057] A plurality of heating tubes are provided in the internal cavity 502. The heating tubes are wrapped around the partition mesh tube 503, and the plurality of heating tubes are arranged at intervals along the axial direction of the partition mesh tube 503, and the plurality of heating tubes form the heating structure; along the partition mesh tube 503 from top to bottom, the diameter of the partition mesh tube 503 gradually increases; by arranging a plurality of heating tubes, the internal cavity 502 can be heated uniformly from top to bottom so that the temperature of the internal cavity 502 reaches the set temperature.

[0058] Multiple heating tubes are heated to make the temperature in the inner cavity 502 reach the set temperature. During the upward longitudinal transmission of the rubber-coated section 402 in the inner cavity, multiple air inlets blow gas downward, and the gas flows downward longitudinally and is discharged from the air extraction port; the gas enters through the air inlet, and the air extraction port can be connected to the air extraction equipment, so that the gas in the outer cavity 501 flows rapidly downward axially.

[0059] Since the diameter of the screen cylinder 503 gradually increases from top to bottom, the gas flowing in the external cavity 501 will partially impact the screen cylinder 503, enter the internal cavity 502 through the multiple mesh holes on the screen cylinder 503, and flow longitudinally along the internal cavity 502.

[0060] The gas in the external cavity 501 in axial flow enters the internal cavity 502 through the mesh, and flows longitudinally downward in the internal cavity 502, so that the silicone coating is synchronously driven by the gas to flow level during the curing process of the silicone coating in the curing channel. The flow leveling here means that the thickness of the silicone coating can be further uniformed and reduced under the drive of the flowing gas and the fluidity of the liquid silicone.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wire silicone coating extrusion molding method, characterized in that: A forming machine is provided, the forming machine comprising a wire-paying structure and a wire-taking structure for winding a wire, a machine head and a curing structure being arranged between the wire-paying structure and the wire-taking structure; a wire-passing path and a glue-feeding path for the wire to pass through are arranged in the machine head, the wire-passing path is arranged longitudinally, the glue-feeding path is connected with the wire-passing path, and the curing structure is arranged above the machine head along the transmission direction of the wire; The wire is unidirectionally transmitted between the wire-releasing structure and the wire-receiving structure, and the wire has a processing section passing through the wire passage; the liquid silicone continuously enters the rubber inlet passage and flows into the wire passage; during the upward longitudinal transmission of the processing section in the wire passage, the liquid silicone wraps around the outer periphery of the processing section to form a silicone coating, and the processing section wrapped with the silicone coating forms a rubber-coated section; After the rubber-coated section moves upwards away from the wire passage, the silicone coating naturally flows downwards longitudinally under the action of gravity during the process of continuing to move longitudinally upwards, so that the silicone coating is evenly wrapped around the outer periphery of the wire, and the thickness of the silicone coating is less than the set thickness; The rubber-coated section after natural leveling enters the curing structure, and the thin layer of silicone is cured and wrapped around the periphery of the wire. The cured rubber-coated section is rolled up in the wire-receiving structure through transmission.

2. The wire silicone coating extrusion molding method according to claim 1, characterized in that: The molding machine includes a feeding system connected to a glue feeding channel, wherein the feeding system includes a plurality of feeders. According to the formula of the liquid silicone, the plurality of feeders respectively provide set amounts of raw materials. The raw materials provided by the plurality of feeders are stirred and mixed to form the liquid silicone, which is supplied to the feeding channel.

3. The wire silicone cladding extrusion molding method according to claim 1 or 2, characterized in that: The curing structure comprises an oven, wherein the oven has a longitudinally arranged curing channel, and a heating structure is arranged on the periphery of the curing channel, and the heating structure is heated to make the temperature in the curing channel higher than a set temperature; The rubber-encapsulated section enters the curing channel after being naturally leveled. During the process of the rubber-encapsulated section being transmitted upward and longitudinally in the curing channel, the silica gel coating is heated and cured.

4. The wire silicone cladding extrusion molding method according to claim 1 or 2, characterized in that: The rubber inlet channel includes a longitudinal section arranged longitudinally and a transverse section arranged transversely, the top of the longitudinal section is provided with a feed port for liquid silicone to enter, the bottom of the transverse section is connected to the inner section of the transverse section by bending, and the outer end of the transverse section is connected to the wire channel to form a discharge port; The liquid silicone enters the feed channel through the feed port, and the liquid silicone in the feed channel enters the wire channel through the discharge port, and is wrapped around the outer periphery of the moving processing section to form the silicone coating.

5. The wire silicone cladding extrusion molding method according to claim 1 or 2, characterized in that: There is an empty leveling area between the wire passage and the curing structure. The rubber-encapsulated section coming out of the wire passage moves longitudinally upward in the leveling area, and the silica gel coating naturally levels longitudinally downward under the action of gravity.

6. The wire silicone coating extrusion molding method according to claim 5, characterized in that: The leveling area is provided with a wire diameter gauge, and the wire diameter gauge measures the outer diameter of the rubber-encapsulated section.

7. The wire silicone cladding extrusion molding method according to claim 1 or 2, characterized in that: A wire-paying weight wheel is arranged between the wire-paying structure and the machine head, and the wire released by the wire-paying structure is wound on the wire-paying weight wheel. The wire-paying weight wheel is respectively located below the wire-paying structure and the machine head.

8. The wire silicone cladding extrusion molding method according to claim 1 or 2, characterized in that: A wire-receiving counterweight wheel is provided between the machine head and the wire-receiving structure, and the rubber-coated section cured by the curing structure is wound on the wire-receiving counterweight wheel. The wire-receiving counterweight wheel is respectively located below the wire-receiving structure and the curing structure.

9. The wire silicone coating extrusion molding method according to claim 8, characterized in that: A traction wheel is provided between the take-up counterweight wheel and the curing structure, and the rubber-coated section cured by the curing structure is wound around the traction wheel, and the traction wheel pulls the rubber-coated section and transmits it to the take-up counterweight wheel.

10. The wire silicone coating extrusion molding method according to claim 3, characterized in that: A longitudinally arranged mesh cylinder is provided in the curing channel, the mesh cylinder is coaxially arranged with the curing channel, the curing channel has an inner cavity surrounded by the mesh cylinder, and an outer cavity surrounding the outer periphery of the mesh cylinder, and the rubber-encapsulated section is longitudinally penetrated in the inner cavity; The top and bottom of the internal cavity are arranged in a closed manner, the top of the internal cavity is provided with a plurality of air inlets, the bottom of the internal cavity is provided with a plurality of air outlets, and the plurality of air inlets and the plurality of air outlets are respectively arranged around the circumference of the separation net cylinder; the separation net cylinder is provided with a plurality of mesh holes, and the internal cavity is connected with the external cavity through the plurality of mesh holes; A plurality of heating tubes are arranged in the inner cavity, the heating tubes are wrapped around the screen cylinder, and the plurality of heating tubes are arranged at intervals along the axial direction of the screen cylinder; along the screen cylinder from top to bottom, the diameter of the screen cylinder gradually increases; The plurality of heating tubes are heated to make the temperature in the inner cavity reach a set temperature. During the process of the rubber-encapsulated section moving upward longitudinally in the inner cavity, the plurality of air inlets blow gas downwardly, and the gas flows downward longitudinally and is discharged from the air extraction port. The gas in the external cavity in axial flow enters the internal cavity through the mesh and flows longitudinally downward in the internal cavity, so that the silica gel coating is synchronously leveled by the gas driven airflow during the curing process of the silica gel coating in the curing channel.

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