A tire vulcanization system and vulcanization method using nitrogen-circulating heating

Abstract

This application relates to the technical field of tire vulcanization equipment, specifically to a tire vulcanization system and method using a full nitrogen circulation heating system. The system includes a circulation pipeline, which sequentially includes a circulation pump, a rapid heating device, a nitrogen heating uniform device, a bladder, a circulation buffer tank, and a filter. The circulation buffer tank is connected to a nitrogen replenishment pipeline, which sequentially includes a nitrogen generation system, a low-pressure nitrogen buffer tank, a booster pump, a high-pressure nitrogen buffer tank, a pressure reducing valve, and a nitrogen replenishment check valve. A recovery pipeline is provided between the bladder and the low-pressure nitrogen buffer tank, and this pipeline includes a vacuum pump and a first recovery valve. A second recovery valve is connected in parallel to both ends of the vacuum pump. A cooling pipeline is connected in parallel to the circulation pipeline, and this pipeline includes a first cooling valve, a second cooling valve, and a cooling device. This invention allows for ideal pressure and temperature control at each stage of tire vulcanization, which helps ensure vulcanization quality, significantly reduces energy waste, and significantly improves production efficiency.

Description

Technical Field

[0001] This application relates to the field of tire vulcanization equipment technology, specifically to a tire all-nitrogen circulating heating vulcanization system and vulcanization method. Background Technology

[0002] Currently, most tire vulcanizing machines in the industry employ a steam and nitrogen co-vulcanization process. Steam provides the heat for tire vulcanization, while nitrogen maintains the pressure inside the bladder. Compared to superheated water or steam vulcanization, the steam and nitrogen co-vulcanization process eliminates water heating and pumping, reducing vulcanization costs; it uses low-pressure nitrogen for shaping, saving on steam costs; and it solves the problem of insufficient pressure in steam vulcanization. Therefore, the steam and nitrogen co-vulcanization process offers more precise condition control and has significant advantages, making it the preferred vulcanization method for most tire manufacturers.

[0003] However, the steam and nitrogen co-vulcanization process still relies heavily on steam. Steam must be supplied by a boiler, and coal-fired boilers produce large amounts of toxic and harmful gases such as sulfur dioxide and carbon monoxide during operation, causing serious environmental pollution. Steam itself is also characterized by fluctuations, high energy consumption, and high losses. Moreover, during vulcanization, steam releases heat and produces condensate, which accumulates on the sides of the bladder, causing uneven vulcanization on the upper and lower sides of the tire, thus affecting the vulcanization quality. Furthermore, the steam and nitrogen co-vulcanization process requires repeated introduction of high-temperature media and condensation removal during the pre-vulcanization stage, causing fluctuations in the pressure inside the bladder. During the pressure-holding vulcanization stage, the temperature inside the bladder drops due to the lack of heat input, resulting in a long pressure-holding time. Nitrogen can be produced by a pressure variation adsorption (PSA) device or a diaphragm device, which is very economical for tire factories producing less than 20,000 tires per day. Therefore, those skilled in the art need to provide a novel all-nitrogen circulating heating vulcanization system and its control method. Summary of the Invention

[0004] This invention proposes a nitrogen-based circulating heating vulcanization system and method, which solves the problems of serious pollution, high energy consumption, large pre-vulcanization pressure fluctuation, uneven temperature on the upper and lower sides, and long pressure holding time in the steam and nitrogen co-vulcanization process. It has the advantages of energy saving and environmental protection, small pressure fluctuation, uniform temperature, and high efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a tire full nitrogen circulation heating vulcanization system, comprising a circulation pipeline, wherein the circulation pipeline is sequentially provided with a circulation pump, a rapid heating device, a nitrogen heating uniform device, a bladder, a circulation buffer tank, and a filter; the circulation buffer tank on the circulation pipeline is connected to a nitrogen replenishment pipeline, wherein the nitrogen replenishment pipeline is sequentially provided with a nitrogen generation system, a low-pressure nitrogen buffer tank, a booster pump, a high-pressure nitrogen buffer tank, a pressure reducing valve, and a nitrogen replenishment check valve; a recovery pipeline is provided between the bladder on the circulation pipeline and the low-pressure nitrogen buffer tank on the nitrogen replenishment pipeline, wherein the recovery pipeline is provided with a vacuum pump and a first recovery valve, and a second recovery valve is connected in parallel at both ends of the vacuum pump; a cooling pipeline is connected in parallel on the circulation pipeline between the circulation pump and the circulation buffer tank, wherein the cooling pipeline is provided with a first cooling valve, a second cooling valve, and a cooling device.

[0006] Preferably, the capsule inlet and outlet are respectively equipped with a first pressure sensor, a third temperature sensor, a fourth temperature sensor, and a second pressure sensor to monitor temperature and pressure fluctuations at the capsule inlet and outlet during vulcanization. A second heating valve is provided between the capsule and the circulating buffer tank, and a temperature sensor is provided at the outlet of the circulating buffer tank.

[0007] Preferably, the nitrogen heating uniform device includes a cylindrical second cylinder, a heating unit, an electromagnetic heating and heat preservation device, a control unit, a fixing device for fixing multiple heating units in series, a signal receiving unit connected to the control unit and used to receive signals from the heating units, a control panel connected to the control unit, a second sealing flange with a stepped through groove, a gas inlet, a gas outlet, and a sealing terminal block, with the electromagnetic heating and heat preservation device covering the outside of the second cylinder.

[0008] One end of the nitrogen heating uniform device is sealed by metal welding, and the other end is sealed by the second sealing flange. The sealing terminal is welded in the stepped through groove on the second sealing flange.

[0009] The heating unit is fixed to the axial section of the second cylinder by a fixing mechanism, and its edge is connected to the inner wall of the second cylinder. The heating unit includes a heating plate, an electromagnetic coil and a coil. The coil has a spiral groove, and the electromagnetic coil is fixed in the spiral groove. The heating plate is placed on the electromagnetic coil. The heating plate has a porous structure. The electromagnetic coil is connected to the control unit through a sealing terminal fixed on the second sealing flange. The signal receiving unit is connected to the heating unit through a thermocouple.

[0010] The electromagnetic heating and insulation device consists of a semi-circular ring connected by hinges and buckles, and is attached to the outer wall of the second cylinder. It includes an outer shell, corner brackets, an electromagnetic heating coil, high-temperature paper, and insulation cotton filled between the outer shell and the electromagnetic heating coil. The electromagnetic heating coil is glued to the inside of the insulation cotton with high-temperature adhesive. The high-temperature paper is located on the innermost side of the electromagnetic heating and insulation device and is fixed by the corner brackets, thus wrapping the electromagnetic heating coil.

[0011] Preferably, the rapid heating device has a lotus root-shaped structure with a porous structure, which includes a nitrogen inlet, cast aluminum, a nitrogen outlet, a first sealing flange, a second electromagnetic heating and heat preservation device, a fine-pore structure, and a first cylinder.

[0012] The rapid heating device uses electromagnetic heating technology. It has a cylindrical structure with both ends sealed by a first sealing flange. The inside of the first cylinder has a fine perforated structure, and the outside of the first cylinder is wrapped with a second electromagnetic heating and heat preservation device.

[0013] The present invention also discloses a method for tire vulcanization using the above-described system with nitrogen circulation heating, the method comprising the following steps:

[0014] Step 1: Charge the system with nitrogen.

[0015] Start the nitrogen generation system and introduce air into it. The nitrogen generation system will fill the low-pressure nitrogen buffer tank with high-purity nitrogen. Turn on the booster pump to pressurize the low-pressure nitrogen. Then, the high-pressure nitrogen enters the high-pressure nitrogen buffer tank. After passing through the pressure reducing valve, the pressure reaches the preset value and enters the nitrogen circulation buffer tank through the nitrogen replenishment check valve.

[0016] Step 2: Preheating

[0017] The electromagnetic heating of the rapid heating device and the nitrogen heating uniform device is activated to preheat themselves. After the rapid heating device and the nitrogen heating uniform device reach the preheating temperature, the third step is performed.

[0018] Step 3: Heating and circulating vulcanization

[0019] The process involves circulating heating, starting the circulating pump, opening the first heating valve, and simultaneously opening the rapid exhaust valve to purge the air from the capsule. Then, the rapid exhaust valve is closed, and the second heating valve is opened. Under the action of the circulating pump, high-pressure nitrogen flows from the nitrogen circulating buffer tank through a filter into the circulating pump, then passes through the nitrogen rapid heating device, where the nitrogen temperature rises rapidly. It then immediately enters the nitrogen heating uniformity device. Under the turbulence and heating effect of the hot plate in the nitrogen heating uniformity device, the humidity and temperature uniformity of the high-pressure nitrogen at the outlet of the device reaches the required operating conditions. It then enters the capsule for vulcanization, and subsequently flows from the capsule outlet into the nitrogen circulating buffer tank, entering the next cycle until the vulcanization stage is complete.

[0020] Step 4: Cooling capsule

[0021] The first heating valve and the second heating valve are closed, and the first cooling valve and the second cooling valve are opened. High-pressure, high-temperature nitrogen gas comes out of the capsule under the action of the circulating pump and passes through the cooling device to reduce the temperature of the nitrogen gas. The circulating buffer tank heats the nitrogen gas at a low temperature according to the working conditions and then directly enters the capsule under the action of the circulating pump to gradually cool the capsule.

[0022] Step 5: Recover nitrogen

[0023] After vulcanization is completed, the circulating pump is turned off, the first cooling valve and the second cooling valve are turned off, and the first recovery valve and the second recovery valve are turned on. The high-pressure nitrogen in the capsule enters the low-pressure nitrogen buffer tank under the action of pressure difference. After the pressure is balanced, the second recovery valve is turned off, the vacuum pump is turned on, the capsule is evacuated, and the remaining nitrogen is recovered to the low-pressure nitrogen buffer tank.

[0024] This invention, through reasonable pipeline design, valve control and temperature setting, can coordinate ideal pressure and temperature at each stage of tire vulcanization, which helps to ensure vulcanization quality. Nitrogen self-circulation enables rational use of energy, significantly reduces energy waste and significantly improves efficiency. Attached Figure Description

[0025] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the overall structure of a tire full nitrogen circulation heating vulcanization system provided by the present invention.

[0027] Figure 2 This is a schematic diagram of a nitrogen heating uniformity device provided by the present invention.

[0028] Figure 3This is a partially enlarged structural diagram of the heating unit in a nitrogen heating uniformity device provided by the present invention.

[0029] Figure 4 This is a schematic diagram of the electromagnetic heating and heat preservation device in a nitrogen heating uniform device provided by the present invention.

[0030] Figure 5 This is a three-dimensional structural diagram of a rapid heating device provided by the present invention.

[0031] Figure 6 This is a front view structural diagram of a rapid heating device provided by the present invention.

[0032] Figure 7 This is a cross-sectional structural diagram of a rapid heating device provided by the present invention.

[0033] Figure 8 This is a left view of the structure of a rapid heating device provided by the present invention.

[0034] The components in the attached diagram are labeled as follows: Circulation pump 1, First heating valve 2, First temperature sensor 3, Rapid heating device 4, Second temperature sensor 5, Nitrogen heating uniform device 6, Circulation pipeline 7, Circulation check valve 8, First pressure sensor 9, Third temperature sensor 10, Fourth temperature sensor 11, Second pressure sensor 12, Back pressure valve 13, Second heating valve 14, Circulation buffer tank 15, Filter 16, First cooling valve 17, Second cooling valve 18, Cooling device 19, Recovery pipeline 20, Rapid exhaust valve 21, Nitrogen generation system 22, Low-pressure nitrogen buffer tank 23, Booster pump 24, High-pressure nitrogen buffer tank 25, Pressure reducing valve 26, Nitrogen replenishment check valve 27, First recovery valve 28, Vacuum pump 29, Second recovery valve 30, Capsule 31, Cooling pipeline 32, Nitrogen replenishment pipeline 33;

[0035] 41. Nitrogen inlet; 42. Cast aluminum; 43. Nitrogen outlet; 44. First sealing flange; 45. Second electromagnetic heating and insulation device; 46. Fine-pore structure; 47. First cylinder.

[0036] Sealed terminal block 61, heating unit 62, hot plate 621, electromagnetic coil 622, coil 623, electromagnetic heating and heat preservation device 63, high temperature paper 631, corner bracket 632, outer shell 633, electromagnetic heating coil 634, signal receiving unit 64, control unit 65, control panel 66, fixing device 67, second sealing flange 68, gas inlet 69, second cylinder 610, gas outlet 611. Detailed Implementation

[0037] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0038] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments. A tire full nitrogen circulation heating vulcanization system includes a circulation pipeline 7, wherein the circulation pipeline 7 is sequentially provided with a circulation pump 1, a rapid heating device 4, a nitrogen heating uniform device 6, a capsule 31, a circulation buffer tank 15 and a filter 16;

[0040] The circulating buffer tank 15 on the circulating pipeline 7 is connected to a nitrogen replenishment pipeline 33, and the nitrogen replenishment pipeline 33 is provided with a nitrogen generation system (PSA) 22, a low-pressure nitrogen buffer tank 23, a booster pump 24, a high-pressure nitrogen buffer tank 25, a pressure reducing valve 26, and a nitrogen replenishment check valve 27 in sequence.

[0041] A recovery pipeline 20 is provided between the capsule 31 on the circulation pipeline 7 and the low-pressure nitrogen buffer tank 23 of the nitrogen replenishment pipeline 33. The recovery pipeline 20 is equipped with a vacuum pump 29 and a first recovery valve 28. A second recovery valve 30 is connected in parallel at both ends of the vacuum pump 29.

[0042] A cooling pipe 32 is connected in parallel between the circulating pump 1 and the circulating buffer tank 15 on the circulating pipe 7. The cooling pipe 32 is equipped with a first cooling valve 17, a second cooling valve 18 and a cooling device 19.

[0043] The capsule 31 is equipped with a first pressure sensor 9, a third temperature sensor 10, a fourth temperature sensor 11, and a second pressure sensor 12 at its inlet and outlet, respectively, to monitor the internal pressure and vulcanization temperature of the capsule 31, thereby adjusting the circulation flow rate of the circulation pipeline 7 and the heating settings under different operating conditions. A second heating valve 14 is provided between the capsule 31 and the circulation buffer tank 15, and a temperature sensor is provided at the outlet of the circulation buffer tank 15.

[0044] A quick exhaust valve 21 is provided on the circulation pipeline 7 between the capsule 31 and the circulation buffer tank 15. The quick exhaust valve 21 can vent impurities from the capsule 31 before the circulation heating and vulcanization is started.

[0045] The rapid heating device 4 on the circulation pipeline 7 is equipped with a first temperature sensor 3 and a second temperature sensor 5 at its inlet and outlet, respectively. A first heating valve 2 is located at the inlet of the rapid heating device 4. A circulation check valve 8 is located at the outlet of the nitrogen heating uniform device 6.

[0046] The circulating buffer tank 15 is enclosed by an electromagnetic heating device, which can be turned on or off and the temperature can be set according to the working status of nitrogen.

[0047] The circulating pump 1 includes, but is not limited to, a rotary pump, a Roots pump, a cylinder pump, etc., which can stably circulate high-temperature and high-pressure nitrogen gas back and forth in the system, thereby improving the stable temperature and pressure for tire vulcanization.

[0048] The nitrogen heating uniform device 6 includes a cylindrical second cylinder 610, a heating unit 62, an electromagnetic heating and heat preservation device 63, a control unit 65, a fixing device 67 for fixing multiple heating units in series, a signal receiving unit 64 connected to the control unit and used to receive signals from the heating units, a control panel 66 connected to the control unit, a second sealing flange 68 with a stepped through groove, a gas inlet 69, a gas outlet 611, and a sealing terminal 61. The second cylinder 610 is externally covered with the electromagnetic heating and heat preservation device 63.

[0049] One end of the nitrogen heating uniform device 6 is sealed by metal welding, and the other end is sealed by the second sealing flange 68. The sealing terminal 61 is welded in the stepped through groove on the second sealing flange 68.

[0050] The number of heating units 62 is at least one set, which is fixed to the axial section of the second cylinder 610 by a fixing mechanism, and its edge is connected to the inner wall of the second cylinder 610. The heating unit 62 includes a hot plate 621, an electromagnetic coil 622 and a coil 623. The coil 623 has a spiral groove, and the electromagnetic coil 622 is fixed in the spiral groove. The hot plate 621 is placed on the electromagnetic coil 622. The hot plate 621 has a porous structure, which can be obtained by machining, metal 3D printing, porous metal or porous foamed metal. The electromagnetic coil 622 is connected to the control unit 65 through a sealing terminal 61 fixed on the sealing flange. The signal receiving unit 64 is connected to the heating unit 62 through a thermocouple. The electromagnetic coil 622 heats the hot plate 621 with a high-frequency alternating current. High-temperature nitrogen gas flowing in from the rapid heating device 4 passes through the porous structure of the hot plate 621, and the nitrogen gas is heated by turbulence. At the outlet, high-temperature and high-pressure nitrogen gas with uniform temperature is obtained, and then it is introduced into the capsule 31 for vulcanization.

[0051] The electromagnetic heating and heat preservation device 63 consists of two semi-circular rings connected by hinges and buckles, and is attached to the outer wall of the second cylinder 610. It includes an outer shell 633, corner brackets 632, an electromagnetic heating coil 634, high-temperature paper 631, and heat preservation cotton filled between the outer shell 633 and the electromagnetic heating coil 634. Figure 4 (Not shown in the image), the electromagnetic heating coil 634 is attached to the inside of the insulation cotton with high-temperature adhesive, and the high-temperature paper 631 is fixed to the innermost side of the electromagnetic heating insulation device 63 by the corner bracket 632, thus wrapping the electromagnetic heating coil 634.

[0052] The rapid heating device 4 has a lotus root-shaped structure with a porous structure inside, which includes a nitrogen inlet 41, cast aluminum 42, nitrogen outlet 43, a first sealing flange 44, a second electromagnetic heating and heat preservation device 45, a fine hole structure 46, and a first cylinder 47.

[0053] The rapid heating device 4 employs a second electromagnetic heating and heat preservation device 45 with the same structure as the electromagnetic heating and heat preservation device 63 to heat the first cylinder 47 of the rapid heating device 4. The rapid heating device 4 has an internal fine-pore structure 46, which can be obtained by casting or machining. Nitrogen gas flowing through the fine-pore structure 46 is rapidly heated. A second temperature sensor 5 at the outlet of the rapid heating device 4 monitors the temperature of the nitrogen gas exiting the rapid heating device 4 and adjusts the set temperature of the rapid heating device 4 based on the outlet nitrogen temperature.

[0054] The cooling pipe 32 can rapidly cool down the high-temperature nitrogen gas coming out of the capsule 31, and then enter the circulating buffer tank 15 to be heated to a low temperature, and then enter the capsule 31 through the circulating pump 1 for circulating cooling.

[0055] The nitrogen replenishment pipeline 33 can separate and purify nitrogen in the air and enter the low-pressure nitrogen buffer tank 23. After being compressed by the booster pump 24, it enters the high-pressure nitrogen buffer tank 25, and then flows into the circulating buffer tank 15 through the pressure reducing valve 26.

[0056] One end of the recovery pipeline 20 is connected to the nitrogen replenishment pipeline 33. The recovery pipeline 20 is equipped with a vacuum pump 29, a first recovery valve 28, and a second recovery valve 30.

[0057] The present invention also discloses a method for tire vulcanization using the above-described system with nitrogen circulation heating, the method comprising the following steps:

[0058] Step 1: Charge the system with nitrogen.

[0059] Start the nitrogen generation system 22 and introduce air into the nitrogen generation system 22. The nitrogen generation system 22 fills the low-pressure nitrogen buffer tank 23 with high-purity nitrogen. Turn on the booster pump 24 to boost the low-pressure nitrogen. Then the high-pressure nitrogen enters the high-pressure nitrogen buffer tank 25. After passing through the pressure reducing valve 26, the pressure reaches the preset value and enters the nitrogen circulation buffer tank 15 through the nitrogen replenishment check valve 27.

[0060] Step 2: Preheating

[0061] The rapid heating device 4 and the nitrogen heating uniform device 6 are activated to preheat themselves using electromagnetic heating. After the rapid heating device 4 and the nitrogen heating uniform device 6 reach the preheating temperature, the third step is performed.

[0062] Step 3: Heating and circulating vulcanization

[0063] The process involves circulating heating. The circulating pump 1 is turned on, the first heating valve 2 is opened, and the rapid exhaust valve 21 is simultaneously opened to vent the air from the capsule 31. Then, the rapid exhaust valve 21 is closed, and the second heating valve 14 is opened. Under the action of the circulating pump 1, high-pressure nitrogen flows from the nitrogen circulating buffer tank 15 through a filter into the circulating pump 1, then passes through the nitrogen rapid heating device 4, where the nitrogen temperature rapidly rises. It then immediately enters the nitrogen heating uniformity device 6. Under the turbulence and heating effect of the hot plate in the nitrogen heating uniformity device 6, the humidity and temperature uniformity of the high-pressure nitrogen at the outlet of the nitrogen heating uniformity device 6 reaches the required operating conditions. It then enters the capsule 31 for vulcanization, and then flows from the outlet of the capsule 31 into the nitrogen circulating buffer tank 15, and then enters the next cycle until the vulcanization stage is completed.

[0064] Step 4: Cooling capsule

[0065] The first heating valve 2 and the second heating valve 14 are closed, and the first cooling valve 17 and the second cooling valve 18 are opened. The high-pressure and high-temperature nitrogen gas comes out of the capsule 31 under the action of the circulating pump 1 and passes through the cooling device to reduce the temperature of the nitrogen gas. The circulating buffer tank 15 heats the nitrogen gas at a low temperature according to the working conditions and directly enters the capsule 31 under the action of the circulating pump 1 to gradually cool the capsule 31.

[0066] Step 5: Recover nitrogen

[0067] After vulcanization is completed, the circulating pump 1 is turned off, the first cooling valve 17 and the second cooling valve 18 are turned off, and the first recovery valve 28 and the second recovery valve 30 are turned on. The high-pressure nitrogen in the capsule 31 enters the low-pressure nitrogen buffer tank 23 under the action of pressure difference. After the pressure is balanced, the second recovery valve 30 is turned off, the vacuum pump 29 is turned on, the capsule 31 is evacuated, and the remaining nitrogen is recovered to the low-pressure nitrogen buffer tank 23.

[0068] The pressure reducing valve 26 on the nitrogen replenishment pipeline 33 is set to the working pressure of the capsule 31 vulcanization. When the pressure in the circulation pipeline 33 is less than the pressure reducing valve 26, the nitrogen in the high-pressure nitrogen buffer tank 25 is replenished to the circulation buffer tank 15 through the nitrogen replenishment check valve 27.

[0069] This embodiment, through reasonable pipeline design, valve control and temperature setting, can coordinate ideal pressure and temperature at each stage of tire vulcanization, which helps to ensure vulcanization quality. Nitrogen self-circulation enables rational use of energy, significantly reduces energy waste and significantly improves efficiency.

[0070] The above examples illustrate the basic principles, main features, and advantages of this invention. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A tire all-nitrogen circulation heating vulcanization system, characterized in that, The system includes a circulation pipeline (7), which is provided with a circulation pump (1), a rapid heating device (4), a nitrogen heating uniform device (6), a capsule (31), a circulation buffer tank (15) and a filter (16) in sequence. The circulating buffer tank (15) on the circulating pipeline (7) is connected to a nitrogen replenishment pipeline (33), and the nitrogen replenishment pipeline (33) is provided with a nitrogen generation system (22), a low-pressure nitrogen buffer tank (23), a booster pump (24), a high-pressure nitrogen buffer tank (25), a pressure reducing valve (26), and a nitrogen replenishment check valve (27) in sequence. A recovery pipeline (20) is provided between the capsule (31) on the circulation pipeline (7) and the low-pressure nitrogen buffer tank (23) of the nitrogen replenishment pipeline (33). A vacuum pump (29) and a first recovery valve (28) are provided on the recovery pipeline (20). A second recovery valve (30) is connected in parallel at both ends of the vacuum pump (29). A cooling pipe (32) is connected in parallel between the circulating pump (1) and the circulating buffer tank (15) on the circulating pipe (7). The cooling pipe (32) is equipped with a first cooling valve (17), a second cooling valve (18) and a cooling device (19). The rapid heating device (4) has a lotus root-shaped structure with a porous structure inside, which includes a nitrogen inlet (41), cast aluminum (42), nitrogen outlet (43), first sealing flange (44), second electromagnetic heating and heat preservation device (45), fine hole structure (46) and first cylinder (47). The rapid heating device (4) adopts electromagnetic heating technology. It has a cylindrical structure and is sealed at both ends by a first sealing flange (44). The first cylinder (47) has a fine hole structure (46) inside and a second electromagnetic heating insulation device (45) is wrapped around the outside of the first cylinder (47). The nitrogen heating uniform device (6) includes a cylindrical second cylinder (610), a heating unit (62), an electromagnetic heating and heat preservation device (63), a control unit (65), a fixing device (67) for fixing multiple heating units in series, a signal receiving unit (64) connected to the control unit and used to receive signals from the heating unit (62), a control panel (66) connected to the control unit, a second sealing flange (68) with a stepped through groove, a gas inlet (69), a gas outlet (611), and a sealing terminal (61). The second cylinder (610) is covered with an electromagnetic heating and heat preservation device (63). One end of the nitrogen heating uniform device (6) is sealed by metal welding, and the other end is sealed by the second sealing flange (68). The sealing terminal (61) is welded in the stepped through groove on the second sealing flange (68). The heating unit (62) is fixed to the axial section of the second cylinder (610) by a fixing mechanism, and its edge is connected to the inner wall of the second cylinder (610). The heating unit (62) includes a heating plate (621), an electromagnetic coil (622) and a coil (623). The coil (623) has a spiral groove, and the electromagnetic coil (622) is fixed in the spiral groove. The heating plate (621) is placed on the electromagnetic coil (622). The heating plate (621) has a porous structure. The electromagnetic coil (622) is connected to the control unit (65) through a sealing terminal (61) fixed on the second sealing flange. The signal receiving unit (64) is connected to the heating unit (62) through a thermocouple.

2. The tire all-nitrogen circulation heating vulcanization system according to claim 1, characterized in that, The capsule (31) is equipped with a first pressure sensor (9), a third temperature sensor (10), a fourth temperature sensor (11), and a second pressure sensor (12) at its inlet and outlet. A second heating valve (14) is provided between the capsule (31) and the circulating buffer tank (15). A temperature sensor is provided at the outlet of the circulating buffer tank (15).

3. The tire all-nitrogen circulation heating vulcanization system according to claim 1, characterized in that, A quick exhaust valve (21) is provided on the circulation pipeline (7) between the capsule (31) and the circulation buffer tank (15).

4. A tire all-nitrogen circulation heating vulcanization system according to claim 2 or 3, characterized in that, The circulating buffer tank (15) is wrapped with an electromagnetic heating device.

5. The tire all-nitrogen circulation heating vulcanization system according to claim 1, characterized in that, The rapid heating device (4) on the circulation pipeline (7) is equipped with a first temperature sensor (3) and a second temperature sensor (5) at its inlet and outlet, respectively. The rapid heating device (4) is equipped with a first heating valve (2) at its inlet, and the nitrogen heating uniform device (6) is equipped with a circulation one-way valve (8) at its outlet.

6. The tire all-nitrogen circulation heating vulcanization system according to claim 1, characterized in that, The electromagnetic heating and heat preservation device (63) consists of two semi-circular rings connected by hinges and buckles, and is attached to the outer wall of the second cylinder (610). It includes an outer shell (633), corner brackets (632), an electromagnetic heating coil (634), and high-temperature paper (631). Insulation cotton is filled between the outer shell (633) and the electromagnetic heating coil (634). The electromagnetic heating coil (634) is pasted to the inside of the insulation cotton with high-temperature adhesive. The high-temperature paper (631) is on the innermost side of the electromagnetic heating and heat preservation device (63) and is fixed by the corner brackets (632), wrapping the electromagnetic heating coil (634).

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