Processing technology of composite thermal insulation foaming silica gel heater with self-temperature-limiting characteristic

Abstract

The invention discloses a processing technology of a composite thermal insulation foaming silica gel heater with a self-temperature-limiting characteristic, which comprises the following steps: S1, cutting silica gel glass fabric by combining a silica gel glass fabric cutting mechanism, and flatly laying the cut silica gel glass fabric in a receiving mold; s2, the electrothermal film raw material is combined with an internal mixer and a double-screw extruder to obtain a PTC electrothermal film material, the PTC electrothermal film material passes through an electrothermal film forming mechanism to obtain a PTC electrothermal film, and the PTC electrothermal film is slit and then laid on the upper layer of the silica gel glass fabric in the receiving mold; s3, mixing foamed silica gel raw materials to obtain a modified foamed silica gel material, laying the modified foamed silica gel material on the upper layer of the PTC electrothermal film in the receiving mold by combining a foamed silica gel laying mechanism, and cutting and laying a layer of silica gel glass fabric on the upper layer of the foamed silica gel again; and S4, compression molding: carrying out compression molding through a hot press, and vulcanizing to obtain a finished product. S5, performing thermal vacuum post-treatment; by adopting the process for forming, sufficient foaming is reasonable, and the foaming ratio is improved, so that the heat preservation effect of the heater is improved.

Description

Technical Field

[0001] This invention relates to the field of silicone heater technology, specifically a processing technology for a composite insulating foamed silicone heater with self-limiting temperature characteristics. Background Technology

[0002] Semiconductor manufacturing often requires the use of various chemical gases. These gases, along with other special gases, enter the process reaction chamber through pre-pipelines and are then extracted by vacuum pumps, forming various toxic and harmful process exhaust gases. These exhaust gases are then treated by exhaust gas treatment devices to effectively reduce environmental pollution. Therefore, in semiconductor manufacturing equipment, the front-end special gas management, the piping within the reaction chamber, and the exhaust gas treatment device piping all involve the transport, reaction, and discharge of high-temperature gases.

[0003] The main semiconductor processes involving gas transport, reaction, and exhaust treatment are etching and vapor deposition, as well as tail gas emissions. In plasma dry etching, the gases supplied from the gas inlet primarily consist of Cl2, CF4, SF6, O2, He, and BCl3. After a series of reactions within the vacuum reaction chamber, the exhaust gases discharged from the outlet mainly include TiClx, AlClx, MoClx, MoFx, and SiO2. CVD processes primarily involve gases such as metal chlorides, hydrocarbons, nitrogen, SiCl4, SiCl2H2, SiH4, NH3, and WF6. Because these gases readily crystallize at room temperature and adhere to the walls of the exhaust pipe, they can easily cause blockages and shutdowns.

[0004] Silicone heaters are generally used to heat pipes. Traditional silicone heaters use alloy resistance wires as heating elements. The alloy resistance wires are inevitably spaced apart, and the thermal conductivity of silicone material is relatively slow, which leads to uneven temperature on the inner surface of the silicone heater. The special gases used in the semiconductor industry require precise temperature delivery to ensure process stability, and the problem of uneven temperature limits the application of this type of product. Summary of the Invention

[0005] The purpose of this invention is to provide a processing technology for a composite thermal insulation foamed silicone heater with self-limiting temperature characteristics, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A processing technology for a composite thermal insulation foamed silicone heater with self-limiting temperature characteristics is disclosed. The processing equipment includes a mixing table, an electric heating film forming mechanism, a foamed silicone laying mechanism, a silicone fiberglass cloth cutting mechanism, and a compression molding mechanism. The mixing table includes a mixer and a twin-screw extruder. The twin-screw extruder is connected to the electric heating film forming mechanism, and the end of the electric heating film forming mechanism is connected to the foamed silicone laying mechanism. The foamed silicone laying mechanism is connected to a raw material mixer. The silicone fiberglass cloth cutting mechanism is located at the edge of the foamed silicone laying mechanism. A receiving mold is provided between the silicone fiberglass cloth cutting mechanism and the foamed silicone laying mechanism. The receiving mold switches back and forth between the silicone fiberglass cloth cutting mechanism and the foamed silicone laying mechanism, sequentially receiving silicone fiberglass cloth, PTC electric heating film, foamed silicone, and silicone fiberglass cloth. A compression molding mechanism is located at the edge of the silicone fiberglass cloth cutting mechanism.

[0007] The processing technology includes the following steps: S1, silicone fiberglass cloth cutting: silicone fiberglass cloth is cut according to the set specifications using a silicone fiberglass cloth cutting mechanism, and the cut silicone fiberglass cloth is laid flat at the bottom of the receiving mold; S2, PTC electric heating film material forming: PTC electric heating film material is obtained by combining electric heating film raw materials with a mixer and a twin-screw extruder, and then PTC electric heating film is obtained through an electric heating film forming mechanism. After being cut, the PTC electric heating film is laid on the upper side of the silicone fiberglass cloth in the receiving mold; S3, foamed silicone material mixing: modified foamed silicone material is obtained by mixing foamed silicone raw materials, and then laid on the upper side of the PTC electric heating film in the receiving mold using a foamed silicone laying mechanism. Another layer of silicone fiberglass cloth is cut and laid on the upper side of the foamed silicone using a silicone fiberglass cloth cutting mechanism; S4, compression molding: the product is pressed and molded using a hot press, and then vulcanized to obtain the finished product; S5, hot vacuum post-treatment: the finished product is heated using a vacuum high-temperature chamber to remove residual small organic molecules in the foamed silicone heater.

[0008] As a further embodiment of the present invention: the electrothermal film forming mechanism includes a control box, a cooling roller is provided at one end of the control box, the cooling roller is connected to a casting frame, an extrusion head is provided at the end of the twin-screw extruder, the extrusion head is connected to the casting frame, two output rollers are installed in parallel on the control box, the electrothermal film material is cast into a film by the casting frame and then enters between the two output rollers, the lower output roller is connected to a drive device, and the electrothermal film reaches the receiving plate after being conveyed by the output roller.

[0009] As a further embodiment of the present invention: a slitting frame is provided on the control box between the cooling roller and the conveying roller, and an edge cutter is provided on the slitting frame. The edge cutter is located on both sides of the electric heating film. An mounting frame and a protective frame are provided on the upper side of the receiving plate near the output roller. A control cylinder is provided on the mounting frame. The slitting cutter is slidably mounted in the protective frame. The control cylinder is connected to the slitting cutter. A guide roller and a recovery roller are provided on the lower side of the receiving plate. After being slid by the edge cutter, the electric heating film is guided by the guide roller and wound back by the recovery roller.

[0010] As a further embodiment of the present invention: the foamed silicone laying mechanism includes an operating table, a rotating arm is provided at the top corner of the receiving mold, a rotating shaft is provided on the rotating arm, the receiving mold is rotatably mounted between the rotating shaft and the operating table, the rotating shaft is connected to a rotary motor, the rotary motor is fixedly mounted on the bottom of the operating table, a guide slide rod and a threaded rod are provided at the bottom of the operating table, a movable frame is slidably mounted on the guide slide rod, the movable frame is threadedly engaged with the threaded rod, the threaded rod is connected to a motor, and a laying component is connected to the upper end of the movable frame.

[0011] As a further embodiment of the present invention: the laying assembly includes a fixed platform mounted on a movable frame, a threaded rod II vertically rotatably mounted on the fixed platform, guide slide rods II on both sides of the threaded rod II, a horizontal plate driven between the threaded rod II and the guide slide rods II, guide heads distributed at the bottom of the horizontal plate, a pulley connected to the threaded rod II through the fixed platform, a transmission belt between the pulley and the motor II, a connecting block at the front end of the fixed platform, a guide tube mounted on the connecting block, a telescopic tube at the bottom of the connecting block communicating with the guide heads, a pressure roller connected to the horizontal plate, insertion posts at both ends of the pressure roller, insertion posts inserted into the horizontal plate, and a support spring sleeved on the insertion post.

[0012] As a further embodiment of the present invention: the bottom of the receiving module is snapped with a base plate, the bottom of the operating table is provided with a bracket, the operating table is provided with a lifting plate, the bracket is provided with a lifting cylinder, and the lifting cylinder is connected to the lifting plate.

[0013] As a further embodiment of the present invention: the silicone fiberglass cloth cutting mechanism includes an operating table 2, an electric drive slide rail arranged in parallel on the operating table 2, an installation frame 2 arranged inside the electric drive slide rail, a release roller rotatably mounted between the installation frames 2, silicone fiberglass cloth wound on the release roller, an inclined frame arranged on the installation frame 2, two output rollers 2 rotatably mounted in parallel on the inclined frame, one of the output rollers 2 being connected to a motor 3, a support plate arranged on the lower edge of the output roller 2, the silicone fiberglass cloth passing between the two output rollers 2 and reaching the support plate, a slitting frame 2 arranged on the support plate, a discharge port arranged on the slitting frame 2, and a slitting knife 2 installed inside the slitting frame 2.

[0014] As a further embodiment of the present invention: the upper side of the second slitting frame is provided with multiple connecting plates, the second slitting blade is provided with connecting rods corresponding to the connecting plates, the connecting rods are inserted into the connecting plates, a return spring is sleeved on the connecting rods, the two ends of the second slitting blade are provided with tilting platforms, the two ends of the second slitting frame are provided with driving cylinders, the driving cylinders are connected to driving blocks, the driving blocks and the tilting platforms cooperate with each other, and the two ends of the second slitting frame facing the second output roller are provided with guide plates.

[0015] As a further embodiment of the present invention: the molding mechanism includes a lifting frame disposed on the second edge of the operating table, a molding cylinder disposed on the top of the lifting frame, a connecting frame connected to the molding cylinder, a molding plate disposed at the bottom of the connecting frame, guide columns disposed on both sides of the molding cylinder on the lifting frame, and a mating sleeve disposed on the connecting frame corresponding to the guide columns.

[0016] As a further embodiment of the present invention: the bottom edge of the receiving module is provided with an arc-shaped chamfer, and the parts where the edges of the first and second operating platforms contact the bottom edge of the receiving module are provided with arc-shaped chamfers.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) Cut the silicone fiberglass cloth using the silicone fiberglass cloth cutting mechanism. Lay the silicone fiberglass cloth, PTC electric heating film, foamed silicone and silicone fiberglass cloth in the receiving mold in the order of A, B, C and D. Mold and mold them together using the molding mechanism. After the foamed silicone heater is vulcanized, it is subjected to heat vacuum post-treatment in a vacuum high temperature box to further reduce the content of small organic molecules in the foamed silicone heater.

[0018] (2) After obtaining the PTC heating film by the casting process, the PTC heating film is cut on both sides by the edge cutter. The waste obtained by the edge cutting is recycled by the guide roller and the recycling roller. The PTC heating film in the middle part is cut into fixed lengths by the cutting blade. The obtained PTC heating film matches the size of the receiving mold, which is convenient for the subsequent stacking and molding of the foamed silicone heater.

[0019] (3) The receiving mold is switched between the silicone foaming mechanism and the silicone fiberglass cloth cutting mechanism by a rotary motor and a rotating wall, which facilitates the receiving mold to receive and combine silicone fiberglass cloth, PTC heating film and silicone foam. The receiving mold is first placed on the silicone fiberglass cloth cutting mechanism, the silicone fiberglass cloth of layer A is cut and laid at the bottom of the receiving groove, and then the receiving mold is rotated to the station of the silicone foaming mechanism, the PTC heating film obtained by the heating film forming structure is laid in the receiving mold, and the silicone foaming mechanism lays the silicone foaming material on the upper side of the PTC heating film in the receiving mold to form layer C. Then the receiving mold is transferred to the station of the silicone fiberglass cloth cutting mechanism, layer D silicone fiberglass cloth is laid in the receiving mold, and finally the molding is performed by the molding mechanism.

[0020] (4) The bottom of the receiving mold is installed through the base plate, which makes it easy to remove the foamed silicone heating film from the receiving mold after it is molded. The base plate is raised by the lifting plate and lifting cylinder at the bottom of the operating table to push the foamed silicone heating film out of the receiving mold, so that the foamed silicone heater can be removed. After edge trimming, sealing, drilling and electrode installation, the heater product can be obtained. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the process flow of the present invention.

[0022] Figure 2 This is a schematic diagram of the overall structure of the processing equipment in this invention.

[0023] Figure 3 This is a schematic diagram of the connection structure between the mixing processing table and the electrothermal film forming mechanism in this invention.

[0024] Figure 4 This is a schematic diagram of the electrothermal film forming mechanism in this invention.

[0025] Figure 5 This is a schematic diagram of the cutting of the PTC electrothermal film in this invention.

[0026] Figure 6 This is a schematic diagram of the combination of the foamed silicone laying mechanism and the silicone fiberglass cloth cutting mechanism in this invention.

[0027] Figure 7 This is a schematic diagram of the foamed silicone laying mechanism in this invention.

[0028] Figure 8 This is a cross-sectional structural diagram of the receiving module in this invention.

[0029] Figure 9 This is a schematic diagram of the installation structure of the lifting plate and the operating platform in this invention.

[0030] Figure 10 This is a schematic diagram of the structure of the laying component in this invention.

[0031] Figure 11 This is a schematic diagram showing the installation of the silicone fiberglass cloth cutting mechanism and the molding mechanism in this invention.

[0032] Figure 12 This is a schematic diagram of the installation of the release roller in this invention.

[0033] Figure 13 for Figure 12 Enlarged structural diagram at point A in the middle.

[0034] Figure 14 This is a schematic diagram of the installation of the second slitting blade in this invention.

[0035] In the diagram: 1. Mixing processing table; 10. Internal mixer; 11. Twin-screw extruder; 12. Extrusion head; 2. Electrothermal film forming mechanism; 20. Control box; 21. Casting frame; 22. Cooling roller; 23. Slitting frame one; 24. Edge cutter; 25. Output roller one; 26. Mounting frame one; 27. Control cylinder; 28. Protective frame; 29. ​​Slitting blade one; 210. Receiving plate; 211. Guide roller; 212. Recycling roller; 3. 30. Foamed silicone laying mechanism; 30. Operating platform 1; 300. Lifting plate; 301. Bracket; 302. Lifting cylinder; 31. Receiving mold; 310. Base plate; 32. Rotating arm; 33. Rotating shaft; 34. Rotary motor; 35. Guide slide rod 1; 36. Threaded rod 1; 37. Motor 1; 38. Moving frame; 39. Laying assembly; 390. Fixed platform; 391. Motor 2; 392. Transmission belt; 393. Pulley 394. Threaded rod II; 395. Guide slide rod II; 396. Connecting block; 397. Feed guide tube; 398. Telescopic tube; 399. Horizontal plate; 3910. Feed guide head; 3911. Pressure roller; 3912. Support spring; 3913. Insertion post; 4. Silicone fiberglass cloth cutting mechanism; 40. Operating table II; 41. Electric drive slide rail; 42. Mounting frame II; 43. Release roller; 44. Inclined frame; 45. Output roller II; 4 6. Motor 3; 47. Support plate; 49. Slitting frame 2; 410. Discharge port; 411. Guide plate; 412. Slitting blade 2; 413. Inclined table; 414. Drive block; 415. Drive cylinder; 416. Connecting plate; 417. Return spring; 418. Connecting rod; 5. Molding mechanism; 50. Lifting frame; 51. Molding cylinder; 52. Guide column; 53. Connecting frame; 54. Mating cylinder; 55. Molding plate. Detailed Implementation

[0036] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "a" and "two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "a" or "two" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0040] like Figure 2 , Figure 3 , Figure 7 As shown, a processing technology for a composite insulating foamed silicone heater with self-limiting temperature characteristics is disclosed. The processing equipment includes a mixing table 1, an electrothermal film forming mechanism 2, a foamed silicone laying mechanism 3, a silicone fiberglass cloth cutting mechanism 4, and a compression molding mechanism 5. The mixing table 1 includes a mixer 10 and a twin-screw extruder 11. The twin-screw extruder 11 is connected to the electrothermal film forming mechanism 2, and the end of the electrothermal film forming mechanism 2 is connected to the foamed silicone laying mechanism 3. The foamed silicone laying mechanism 3 is connected to a raw material mixer. The silicone fiberglass cloth cutting mechanism 4 is located at the edge of the foamed silicone laying mechanism 3. A receiving mold 31 is provided between the silicone fiberglass cloth cutting mechanism 4 and the foamed silicone laying mechanism 3. The receiving mold 31 switches back and forth between the silicone fiberglass cloth cutting mechanism 4 and the foamed silicone laying mechanism 3 to receive silicone fiberglass cloth, PTC electric heating film, foamed silicone, and silicone fiberglass cloth in sequence. A molding mechanism 5 is provided at the edge of the silicone fiberglass cloth cutting mechanism 4.

[0041] like Figure 1 , Figure 7As shown, the processing technology includes the following steps: S1, silicone fiberglass cloth cutting: silicone fiberglass cloth is cut according to the set specifications and dimensions using the silicone fiberglass cloth cutting mechanism 4, and the cut silicone fiberglass cloth is laid flat on the bottom of the receiving mold 31; S2, PTC electric heating film material forming: PTC electric heating film material is obtained by combining the electric heating film raw material with the internal mixer 10 and the twin-screw extruder 11, and then PTC electric heating film is obtained through the electric heating film forming mechanism 2. After being cut, the PTC electric heating film is laid on the upper side of the silicone fiberglass cloth in the receiving mold 31; S3 3. Foamed silicone material mixing: The foamed silicone raw materials are mixed to obtain modified foamed silicone material, which is then laid on the upper side of the PTC electric heating film in the receiving mold 31 by the foamed silicone laying mechanism 3. A layer of silicone fiberglass cloth is then cut and laid on the upper side of the foamed silicone by the silicone fiberglass cloth cutting mechanism 4. S4. Compression molding: The product is pressed and molded by a hot press and then vulcanized to obtain the finished product. S5. Thermal vacuum post-treatment: The finished product is heated in a vacuum high-temperature chamber to remove residual small organic molecules in the foamed silicone heater.

[0042] Specifically, this invention uses PTC polymer heating film material as the heating element of the silicone heater, which consists of four layers, namely layers A, B, C and D. Layer A is a silicone fiberglass cloth layer, which is attached to the surface of the heating pipe. Layer B is a PTC electric heating film layer, layer C is a foamed silicone layer, and layer D is a silicone fiberglass cloth layer. The four-layer structure is integrally molded to improve the heating and heat preservation efficiency and reduce the outward diffusion of heat.

[0043] More specifically, the raw materials for preparing the PTC electrothermal film include: one or more of the following polymer-based PTC semiconductor materials: PVDF, ETFE, FEP, PFA, etc., 5-50 parts by weight of conductive powders such as carbon black, carbon nanotubes, graphene, and metal powder; 1-30 parts by weight of inorganic fillers such as zinc oxide, calcium carbonate, and alumina; and 0.5-5 parts by weight of functional additives such as antioxidants, copper inhibitors, coupling agents, and compatibilizers. When mixing the raw materials, the polymer raw materials and functional additives are fed into a mixer 10 and a twin-screw extruder 11 to fully melt and mix. Then, the conductive powders and fillers are fed in, and the discharge temperature is controlled to be within 80°C above the melting point of the polymer with the highest melting point in the system, and not exceeding the decomposition temperature of all raw material components in the formulation, to obtain the PTC composite material. The PTC composite material is formed into a film by the electrothermal film forming mechanism 2, with a film thickness controlled at 20-80 μm and a thickness deviation ≤5%. After slitting, it is ready for use.

[0044] More specifically, the formula for the foamed silicone rubber is: 100 phr of methyl vinyl silicone rubber, 0.5–2.5 phr of platinum vulcanizing agent, 5–50 phr of fumed silica, and 1–10 phr of sodium bicarbonate foaming agent (which can be adjusted according to the foaming ratio). After the formula components are thoroughly mixed, the modified foamed silicone rubber material is obtained and connected to the foamed silicone rubber laying mechanism 3 to facilitate subsequent foamed silicone rubber molding.

[0045] More specifically, the silicone fiberglass cloth is cut by the silicone fiberglass cloth cutting mechanism 4, and the silicone fiberglass cloth, PTC electric heating film, foamed silicone and silicone fiberglass cloth are laid in the receiving mold 31 in the order of A, B, C and D. They are then molded into one piece by the molding mechanism 5. After the foamed silicone heater is vulcanized, it is subjected to heat vacuum post-treatment in a vacuum high temperature chamber to further reduce the content of small organic molecules in the foamed silicone heater.

[0046] Furthermore, such as Figure 3 , Figure 4 , Figure 5 As shown, the electrothermal film forming mechanism 2 includes a control box 20. A cooling roller 22 is provided at one end of the control box 20. The cooling roller 22 is connected to a casting frame 21. An extrusion head 12 is provided at the end of the twin-screw extruder 11. The extrusion head 12 is connected to the casting frame 21. Two output rollers 25 are installed in parallel on the control box 20. After the electrothermal film material is cast into a film by the casting frame 21, it enters between the two output rollers 25. The lower output roller 25 is connected to a driving device. After being conveyed by the output roller 25, the electrothermal film reaches the receiving plate 210.

[0047] Specifically, after the PTC electric heating film raw material passes through the internal mixer 10 and the twin-screw extruder 11, it enters the casting frame 21 through the extrusion head 12. Here, a casting process is used to form the film. After the PTC electric heating film is formed in the casting frame 21, it is cooled and shaped by the cooling roller 22. The PTC electric heating film is continuously pulled forward by two output rollers 25 and received by the receiving plate 210.

[0048] Furthermore, such as Figure 4 , Figure 5As shown, a slitting frame 23 is provided on the control box 20 between the cooling roller 22 and the conveying roller 1. An edge cutter 24 is provided on the slitting frame 23. The edge cutter 24 is located on both sides of the electric heating film. An mounting frame 26 and a protective frame 28 are provided on the upper side of the receiving plate 210 near the output roller 25. A control cylinder 27 is provided on the mounting frame 26. A slitting cutter 29 is slidably mounted in the protective frame 28. The control cylinder 27 is connected to the slitting cutter 29. A guide roller 211 and a recovery roller 212 are provided on the lower side of the receiving plate 210. After being cut by the edge cutter 24, the electric heating film is guided by the guide roller 211 and wound back by the recovery roller 212.

[0049] Specifically, after the PTC heating film is obtained by the casting process, the two sides of the PTC heating film are cut by the edge cutter 24. The waste obtained by the edge cutting is recycled by the guide roller 211 and the recycling roller 212, while the PTC heating film in the middle is cut to a fixed length by the cutting blade 29. The obtained PTC heating film matches the size of the receiving mold 31, which is convenient for the subsequent stacking and molding of the foamed silicone heater.

[0050] Furthermore, such as Figure 6 , Figure 7 As shown, the foamed silicone laying mechanism 3 includes an operating table 30. A rotating arm 32 is provided at the top corner of the receiving mold 31. A rotating shaft 33 is provided on the rotating arm 32. The receiving mold 31 is rotatably mounted to the operating table 30 via the rotating shaft 33. A rotary motor 34 is connected to the rotating shaft 33. The rotary motor 34 is fixedly installed at the bottom of the operating table 30. A guide slide rod 35 and a threaded rod 36 are provided at the bottom of the operating table 30. A movable frame 38 is slidably mounted on the guide slide rod 35. The movable frame 38 and the threaded rod 36 are threadedly engaged. A motor 37 is connected to the threaded rod 36. A laying component 39 is connected to the upper end of the movable frame 38.

[0051] Specifically, the receiving mold 31 is switched between the silicone foaming mechanism 3 and the silicone fiberglass cloth cutting mechanism 4 via a rotary motor 34 and a rotating wall, facilitating the receiving mold 31's reception and combination of silicone fiberglass cloth, PTC heating film, and silicone foam. The receiving mold 31 is first placed on the silicone fiberglass cloth cutting mechanism 4, where layer A of the silicone fiberglass cloth is cut and laid at the bottom of the receiving groove. Then, the receiving mold 31 is rotated to the station of the silicone foaming mechanism 3, where the PTC heating film obtained from the heating film molding structure is laid in the receiving mold 31. The silicone foaming mechanism 3 then lays silicone foam material on the upper side of the PTC heating film in the receiving mold 31 to form layer C. Next, the receiving mold 31 is transferred to the station of the silicone fiberglass cloth cutting mechanism 4, where layer D of the silicone fiberglass cloth is laid inside the receiving mold 31. Finally, the mold is molded using the molding mechanism 5.

[0052] Furthermore, such as Figure 10 As shown, the laying assembly 39 includes a fixed platform 390 mounted on a movable frame 38. A threaded rod 394 is vertically rotatably mounted on the fixed platform 390. Guide slide rods 395 are provided on both sides of the threaded rod 394. A horizontal plate 399 is driven between the threaded rod 394 and the guide slide rods 395. Guide heads 3910 are distributed at the bottom of the horizontal plate 399. The threaded rod 394 passes through the fixed platform 390 and is connected to a pulley 393. The pulley 393 is connected to a motor 391. A transmission belt 392 is provided. A connecting block 396 is provided at the front end of the fixed platform 390. A guide pipe 397 is installed on the connecting block 396. A telescopic pipe 398 is provided at the bottom of the connecting block 396. The telescopic pipe 398 is connected to the guide head 3910. A pressure roller 3911 is connected to the horizontal plate 399. Insertion posts 3913 are provided at both ends of the pressure roller 3911. The insertion posts 3913 are inserted into the horizontal plate 399. A support spring 3912 is sleeved on the insertion post 3913.

[0053] Specifically, after the foamed silicone raw materials are mixed, they are conveyed by the guide pipe 397. The laying component 39 moves back and forth on the operating table 30 using the moving frame 38. When the moving frame 38 reaches the end of the receiving mold 31, the horizontal plate 399 is lowered by the motor 391 and the threaded rod 394, so that the guide head 3910 extends into the receiving mold 31 and lays the foamed silicone layer on the B layer PTC heating film. The elastically installed pressure roller 3911 presses over the surface of the foamed silicone layer, so that the foamed silicone layer is evenly laid on the upper surface of the PTC heating film, forming the C layer foamed silicone layer.

[0054] Furthermore, such as Figure 8 , Figure 9As shown, the bottom of the receiving module 31 is snapped with a base plate 310, the bottom of the operating table 30 is provided with a bracket 301, the operating table 30 is provided with a lifting plate 300, the bracket 301 is provided with a lifting cylinder 302, and the lifting cylinder 302 is connected to the lifting plate 300.

[0055] Specifically, the bottom of the receiving mold 31 is movably installed via the base plate 310, which facilitates the removal of the foamed silicone heating film from the receiving mold 31 after subsequent molding. The base plate 310 is raised by the lifting plate 300 and the lifting cylinder 302 at the bottom of the operating table 30, which pushes the foamed silicone heating film out of the receiving mold 31, making it easy to remove the foamed silicone heater. After edge trimming, sealing, drilling, and electrode installation, the finished heater can be obtained.

[0056] Furthermore, such as Figure 11 , Figure 12 , Figure 13 As shown, the silicone fiberglass cloth cutting mechanism 4 includes an operating table 40, on which an electric drive slide rail 41 is arranged in parallel. A mounting frame 42 is installed inside the electric drive slide rail 41. A release roller 43 is rotatably mounted between the mounting frames 42. Silicone fiberglass cloth is wound on the release roller 43. An inclined frame 44 is installed on the mounting frame 42. Two output rollers 45 are rotatably mounted in parallel on the inclined frame 44. A motor 46 is connected to one of the output rollers 45. A support plate 47 is provided on the lower edge of the output roller 45. The silicone fiberglass cloth passes between the two output rollers 45 and reaches the support plate 47. A slitting frame 49 is installed on the support plate 47. A discharge port 410 is provided on the slitting frame 49. A slitting blade 412 is installed inside the slitting frame 49.

[0057] Specifically, the release roller 43 is moved by the electric drive slide rail 41. When the release roller 43 moves to the end of the receiving mold 31, the output roller 45 is controlled to rotate, releasing the silicone fiberglass cloth into the receiving mold 31 and laying it on the upper side of the C layer foamed silicone to form the D layer silicone fiberglass cloth. After the release is completed, the silicone fiberglass cloth is cut by the slitting blade 412.

[0058] Furthermore, such as Figure 13 , Figure 14As shown, the upper side of the second slitting frame 49 is provided with multiple connecting plates 416. The second slitting blade 412 is provided with a connecting rod 418 corresponding to the connecting plate 416. The connecting rod 418 is inserted into the connecting plate 416. A return spring 417 is sleeved on the connecting rod 418. The two ends of the second slitting blade 412 are provided with tilting platforms 413. The two ends of the second slitting frame 49 are provided with driving cylinders 415. The driving cylinders 415 are connected to driving blocks 414. The driving blocks 414 and the tilting platforms 413 cooperate with each other. The two ends of the second slitting frame 49 facing the output roller 45 are provided with guide plates 411.

[0059] Specifically, the drive cylinder 415 drives the drive block 414 to move, which in turn acts on the second slitting blade 412 at the tilting table 413, causing the second slitting blade 412 to move toward the silicone fiberglass cloth at the discharge port 410 to complete the slitting operation. After the drive block 414 returns to its original position, the second slitting blade 412 returns to its initial position under the action of the return spring 417.

[0060] Furthermore, such as Figure 11 As shown, the molding mechanism 5 includes a lifting frame 50 disposed on the edge of the operating table 40. A molding cylinder 51 is disposed on the top of the lifting frame 50. A connecting frame 53 is connected to the molding cylinder 51. A molding plate 55 is disposed at the bottom of the connecting frame 53. Guide columns 52 are disposed on both sides of the molding cylinder 51 on the lifting frame 50. A mating sleeve 54 is disposed on the connecting frame 53 corresponding to the guide columns 52.

[0061] Specifically, after the receiving mold 31 completes the laying of four layers of material, the silicone fiberglass cloth cutting mechanism 4 detaches from the upper area of ​​the receiving mold 31 and drives the connecting frame 53 to descend through the molding cylinder 51, causing the molding plate 55 to fall into the receiving mold 31. The molding plate 55 has a heating function and performs cross-linking and foaming integral molding under high temperature and high pressure. The molding temperature is controlled between 120 and 165°C, and the molding pressure is 3 MPa. The molding temperature design is determined based on the cross-linking temperature and the decomposition temperature of the foaming agent, and is carried out in two stages. The initial cross-linking temperature of the first stage is 125°C (the sulfur initiation temperature of the silicone platinum vulcanization system), and the first stage cross-linking time is 1 / 3 of the TC90 (positive vulcanization time in the vulcanization curve) at 125°C. The time for the example formulation is 5 minutes. The second stage temperature is designed to be the peak decomposition temperature of the foaming agent used. The temperature for the example formulation is 160°C, and the second stage molding time is 2 / 3 of the TC90 (positive vulcanization time in the vulcanization curve) of the example formulation at 160°C. The above-mentioned process is used to achieve full foaming and increase the foaming ratio, thereby improving the heat preservation effect of the heater.

[0062] Furthermore, such as Figure 6 , Figure 7 , Figure 8As shown, the bottom edge of the receiving module 31 is provided with an arc-shaped chamfer, and the parts where the edges of the first operating table 30 and the second operating table 40 contact the bottom edge of the receiving module 31 are provided with arc-shaped chamfers.

[0063] Specifically, the bottom of the receiving module 31 and the edges of the operating platform 30 and the operating platform 40 are provided with arc-shaped chamfers, so that the receiving module 31 can be smoothly rotated between the operating platform 30 and the operating platform 40, and the sharp edges can be avoided to scratch the surface of the operating platform 30 or the operating platform 40.

[0064] The working principle of this invention embodiment is as follows: like Figures 1-14As shown, this invention uses PTC polymer heating film material as the heating element of a silicone heater, comprising a four-layer structure, namely layers A, B, C, and D. Layer A is a silicone fiberglass cloth layer, which is attached to the surface of the heating pipe. Layer B is a PTC electric heating film layer, layer C is a foamed silicone layer, and layer D is a silicone fiberglass cloth layer. The four-layer structure is integrally molded to improve heating and heat preservation efficiency and reduce heat diffusion. The silicone fiberglass cloth is cut by a silicone fiberglass cloth cutting mechanism 4, and the silicone fiberglass cloth, PTC electric heating film, foamed silicone, and silicone fiberglass cloth are laid in the receiving mold 31 in the order of A, B, C, and D. The molding process is then performed by a molding mechanism 5 to integrally mold the material. After vulcanization, the foamed silicone heater undergoes a high-temperature vacuum post-treatment to further reduce the content of small organic molecules within the foamed silicone heater. After passing through the internal mixer 10 and the twin-screw extruder 11, the PTC electric heating film raw material enters the casting frame 21 through the extrusion head 12. Here, the casting process is used to form the film. After the PTC electric heating film is formed in the casting frame 21, it is cooled and shaped by the cooling roller 22. The PTC electric heating film is continuously pulled forward by two output rollers 25 and received by the receiving plate 210. After the PTC electric heating film is obtained by the casting process, the two sides of the PTC electric heating film are cut by the edge cutter 24. The waste material obtained by the edge cutting is recycled by the guide roller 211 and the recovery roller 212, while the PTC electric heating film in the middle is cut to a fixed length by the slitting blade 29. The resulting PTC electric heating film matches the size of the receiving mold 31, which is convenient for the subsequent stacking and molding of foamed silicone heaters. The receiving mold 31 is switched between the silicone foaming material laying mechanism 3 and the silicone fiberglass cloth cutting mechanism 4 via a rotary motor 34 and a rotating wall, facilitating the receiving and combination of silicone fiberglass cloth, PTC heating film, and silicone foaming material by the receiving mold 31. The receiving mold 31 is first placed on the silicone fiberglass cloth cutting mechanism 4, where layer A of the silicone fiberglass cloth is cut and laid at the bottom of the receiving groove. Then, the receiving mold 31 is rotated to the station of the silicone foaming material laying mechanism 3, where the PTC heating film obtained from the heating film molding structure is laid in the receiving mold 31. The silicone foaming material laying mechanism 3 then lays silicone foaming material on the upper side of the PTC heating film in the receiving mold 31 to form layer C. The receiving mold 31 is then transferred to the station of the silicone fiberglass cloth cutting mechanism 4, where layer D of the silicone fiberglass cloth is laid inside the receiving mold 31. Finally, the mold is molded by the molding mechanism 5.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0066] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A process for processing a composite heat retaining foamed silica gel heater having a self-limiting temperature characteristic, characterized by, The processing process comprises the following steps: S1, cutting of silica gel glass fiber cloth, combining a silica gel glass fiber cloth cutting mechanism (4) to cut the silica gel glass fiber cloth according to the set size, and laying the cut silica gel glass fiber cloth on the bottom of a receiving mold (31); S2, PTC electrothermal film material forming, combining a banbury mixer (10) and a double screw extruder (11) to obtain PTC electrothermal film material, and obtaining PTC electrothermal film through an electrothermal film forming mechanism (2), and laying the PTC electrothermal film on the upper side of the silica gel glass fiber cloth in the receiving mold (31) after cutting; S3, mixing of foamed silica gel material, obtaining modified foamed silica gel material by mixing foamed silica gel raw material, laying the foamed silica gel material on the upper side of the PTC electrothermal film in the receiving mold (31) by combining a foamed silica gel laying mechanism (3), and laying a layer of silica gel glass fiber cloth on the upper side of the foamed silica gel by cutting again through the silica gel glass fiber cloth cutting mechanism (4); S4, mold pressing forming, pressing and forming through a hot press, and obtaining a finished product after vulcanization; S5, hot vacuum post-treatment, heating the finished product in a vacuum high-temperature box to remove residual organic small molecules in the foamed silica gel heater; The processing equipment involved in the processing process comprises a mixing processing table (1), an electrothermal film forming mechanism (2), a foamed silica gel laying mechanism (3), a silica gel glass fiber cloth cutting mechanism (4), and a mold pressing forming mechanism (5), the mixing processing table (1) comprises a banbury mixer (10) and a double screw extruder (11), the double screw extruder (11) is mutually connected with the electrothermal film forming mechanism (2), the end of the electrothermal film forming mechanism (2) is mutually connected with the foamed silica gel laying mechanism (3), the foamed silica gel laying mechanism (3) is connected with a raw material mixer, the silica gel glass fiber cloth cutting mechanism (4) is arranged at the edge of the foamed silica gel laying mechanism (3), a receiving mold (31) is arranged between the silica gel glass fiber cloth cutting mechanism (4) and the foamed silica gel laying mechanism (3), the receiving mold (31) is switched back and forth between the silica gel glass fiber cloth cutting mechanism (4) and the foamed silica gel laying mechanism (3), and silica gel glass fiber cloth, PTC electrothermal film, foamed silica gel, and silica gel glass fiber cloth are sequentially received, and the edge of the silica gel glass fiber cloth cutting mechanism (4) is provided with the mold pressing forming mechanism (5).

2. The process for manufacturing a composite temperature limited heater according to claim 1, wherein, The electrothermal film forming mechanism (2) comprises a control box (20), one end of the control box (20) is provided with a cooling roller (22), the cooling roller (22) is connected with a flow casting frame (21), the end of the double screw extruder (11) is provided with an extrusion head (12), the extrusion head (12) is connected with the flow casting frame (21), two output rollers one (25) are parallelly installed on the control box (20), electrothermal film material is flowed and formed into a film through the flow casting frame (21) and then enters between the two output rollers one (25), the output roller one (25) on the lower side is connected with a driving device, and the electrothermal film reaches a receiving plate (210) after being conveyed through the output roller one (25).

3. The process for manufacturing a composite temperature limited heater according to claim 2, wherein, The control box (20) between the cooling roller (22) and the conveying roller is provided with a slitting frame I (23), the slitting frame I (23) is provided with an edge cutter (24), the edge cutter (24) is arranged on both sides of the electrothermal film, the receiving plate (210) is provided with a mounting frame I (26) and a protection frame (28) on the upper side of one end close to the output roller I (25), the mounting frame I (26) is provided with a control cylinder (27), the protection frame (28) is slidably installed with a slitting cutter I (29), the control cylinder (27) is connected with the slitting cutter I (29), the lower side of the receiving plate (210) is provided with a guide roller (211) and a recovery roller (212), the electrothermal film is guided by the guide roller (211) after being slitted by the edge cutter (24) and is wound and recovered by the recovery roller (212).

4. The process for manufacturing a composite temperature limited heater according to claim 1, wherein, The foamed silica gel laying mechanism (3) comprises an operation table I (30), the top corner part of the receiving die (31) is provided with a indexing arm (32), the indexing arm (32) is provided with a rotating shaft (33), the receiving die (31) is rotatably installed between the rotating shaft (33) and the operation table I (30), the rotating shaft (33) is connected with a rotating motor (34), the rotating motor (34) is fixedly installed at the bottom of the operation table I (30), the bottom of the operation table I (30) is provided with a guide sliding rod I (35) and a threaded rod I (36), the guide sliding rod I (35) is slidably installed with a moving frame (38), the moving frame (38) is threadedly matched with the threaded rod I (36), the threaded rod I (36) is connected with a motor I (37), and the moving frame (38) is connected with a laying assembly (39) at the upper end.

5. The process for processing a composite temperature limited heater according to claim 4, wherein, The laying assembly (39) comprises a fixing table (390) arranged on the moving frame (38), the fixing table (390) is vertically rotatably installed with a threaded rod II (394), the two sides of the threaded rod II (394) are provided with guide sliding rods II (395), the threaded rod II (394) and the guide sliding rods II (395) are drivingly installed with a horizontal plate (399), the bottom of the horizontal plate (399) is provided with a material guide head (3910), the threaded rod II (394) penetrates through the fixing table (390) and is connected with a belt wheel (393), the belt wheel (393) is provided with a transmission belt (392) between the motor II (391), the front end of the fixing table (390) is provided with a connecting block (396), the connecting block (396) is installed with a material guide pipe (397), the bottom of the connecting block (396) is provided with an expansion pipe (398), the expansion pipe (398) is communicated between the material guide head (3910), the horizontal plate (399) is connected with a compression roller (3911), the two ends of the compression roller (3911) are provided with plug-in columns (3913), the plug-in columns (3913) are plugged with the horizontal plate (399), and the plug-in columns (3913) are sleeved with supporting springs (3912).

6. The process for processing a composite temperature limited heater according to claim 4, wherein, The bottom of the receiving die (31) is clamped with a bottom plate (310), the bottom of the operation table one (30) is provided with a bracket (301), the operation table one (30) is provided with a lifting plate (300), the bracket (301) is provided with a lifting cylinder (302), and the lifting cylinder (302) is connected with the lifting plate (300).

7. The process for processing a composite temperature limited heater according to claim 4, wherein, The silica gel glass fiber cloth cutting mechanism (4) includes an operation table two (40), parallelly arranged electric drive slide rails (41) are arranged on the operation table two (40), mounting frames two (42) are arranged in the electric drive slide rails (41), release rollers (43) are rotatably arranged between the mounting frames two (42), silica gel glass fiber cloth is wound on the release rollers (43), inclined frames (44) are arranged on the mounting frames two (42), two output rollers two (45) are rotatably arranged on the inclined frames (44) in parallel, one of the output rollers two (45) is connected with a motor three (46), a supporting plate (47) is arranged at the edge of the lower output roller two (45), the silica gel glass fiber cloth passes between the two output rollers two (45) and reaches the supporting plate (47), a cutting frame two (49) is arranged on the supporting plate (47), a discharge port (410) is arranged on the cutting frame two (49), and a cutting knife two (412) is arranged in the cutting frame two (49).

8. The process for processing a composite temperature limited heater according to claim 7, wherein, A plurality of connecting plates (416) are arranged on the upper side of the cutting frame two (49), connecting rods (418) are arranged at positions corresponding to the connecting plates (416) of the cutting knife two (412), the connecting rods (418) are inserted between the connecting plates (416), return springs (417) are sleeved on the connecting rods (418), inclined tables (413) are arranged at the two ends of the cutting knife two (412), drive cylinders (415) are arranged at the two ends of the cutting frame two (49), drive blocks (414) are connected with the drive cylinders (415), the drive blocks (414) and the inclined tables (413) are matched with each other, and guide plates (411) are arranged at the two ends of one side of the cutting frame two (49) facing the output roller two (45).

9. The process for processing a composite temperature limited heater according to claim 7, wherein, The mold pressing forming mechanism (5) includes a lifting frame (50) arranged at the edge of the operation table two (40), a mold pressing cylinder (51) is arranged at the top of the lifting frame (50), a connecting frame (53) is connected with the mold pressing cylinder (51), a mold pressing plate (55) is arranged at the bottom of the connecting frame (53), guide columns (52) are arranged at the two sides of the lifting frame (50) of the mold pressing cylinder (51), and matching barrels (54) are arranged at positions corresponding to the guide columns (52) of the connecting frame (53).

10. The process for processing a composite temperature limited heater according to claim 7, wherein, The bottom edge of the receiving die (31) is provided with an arc chamfer, and the edges of the operation table one (30) and the operation table two (40) and the positions, where the edges of the operation table one (30) and the operation table two (40) and the bottom edge of the receiving die (31) are in contact with each other, are provided with arc chamfers.

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