A central vulcanizing chamber structure of a hollow tire vulcanizing machine and its use method

Abstract

The invention discloses a central vulcanizing chamber structure of a hollow tire vulcanizer and a method for using the same. The mold comprises an upper mold and a lower mold, the upper mold and the lower mold form a mold cavity, a nitrogen mechanism is provided at the inner bottom of the lower mold, the nitrogen mechanism comprises a column, a first through groove and a second through groove are provided on the surface of the column, a plurality of support columns are fixedly connected in the first through groove and the second through groove, a piston cylinder and a nitrogen channel are provided inside the column, a first piston and a second piston are movably connected in the piston cylinder, a piston rod is fixedly connected on one side of the first piston and the second piston, and the design of the nitrogen mechanism can perform normal vulcanization processing on the tire without a capsule, effectively reduce production costs, save time for replacing capsules, greatly improve work efficiency, effectively improve the vulcanization efficiency of the tire by the action of a heating plate and high-temperature and high-pressure nitrogen, and play a positive role in improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of tire manufacturing equipment, in particular to a central vulcanizing chamber structure of a hollow tire vulcanizer and a use method thereof. Background Art

[0002] Since the 1950s, the vulcanization of automobile tires has been popularized and applied with capsule curing machines. For tires with an inner diameter of less than 65 in the curing chamber, that is, all passenger car tires and medium-sized truck tires, double-mode curing is basically used for curing. For tires with an inner diameter of more than 65, single-mode curing vulcanizers or curing tanks are used. The first double-mode curing machine is the mechanical curing machine, which adopts a crank gear connecting rod (or four-link) structure and has a simple mechanism principle. At the moment of mold closing, the mold closing force is increased, and a larger mold closing force can be obtained with a smaller motor power. After that, the motor will no longer work, and the mold closing force can always be maintained until the mold is reopened. Although the mechanical curing machines used in the world are manufactured by different manufacturers, have different specifications and models, and have been continuously improved for many years, their basic structures have not changed.

[0003] The existing tire vulcanizer uses steam or heat-conducting oil to apply internal pressure to the mold using a capsule. Steam and nitrogen are injected into the capsule to shape and squeeze the inside of the tire. The nitrogen is nitrogen at room temperature. The characteristics of such conventional vulcanizers are: when using capsules, the capsule needs to be replaced once every 300-400 times, and the cost of the capsule is high, and the replacement of the capsule takes at least half an hour, which affects the operating efficiency. The nitrogen used in the capsule is at room temperature, which will reduce the temperature and affect the tire vulcanization time. For this reason, a hollow tire vulcanizer central vulcanization chamber structure and a method of using the same are proposed. Summary of the invention

[0004] The object of the present invention is to provide a central vulcanizing chamber structure of a hollow tire vulcanizer and a method of using the same to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a central vulcanizing chamber structure of a hollow tire vulcanizer, comprising a mold, wherein the mold comprises an upper mold and a lower mold, wherein the upper mold and the lower mold form a mold cavity, and a nitrogen mechanism is provided at the inner bottom of the lower mold;

[0006] The nitrogen mechanism comprises a column, a first through groove and a second through groove are provided on the surface of the column, a plurality of support columns are fixedly connected in the first through groove and the second through groove, a piston cylinder and a nitrogen channel are provided inside the column, a first piston and a second piston are movably connected in the piston cylinder, a piston rod is fixedly connected on one side of the first piston and the second piston, a spring is sleeved on the surface of the piston rod, the spring is located in the piston cylinder, a plurality of sleeves are fixedly connected to the surface of the column, a sliding rod is movably inserted in the sleeve, a connecting rod matching the sliding rod is evenly fixedly connected to the surface of the two piston rods around a circle, a plurality of connecting rods have their ends away from the piston rod fixedly connected to the surfaces of the plurality of sliding rods respectively, and the nitrogen channel is connected to the piston cylinder.

[0007] As a further preferred embodiment of the present technical solution: the inner peripheral wall of the mold cavity is connected with a plurality of capillaries, the upper mold and the lower mold are provided with exhaust channels and heating chambers, the two exhaust channels are connected with the mold cavity through capillaries, one side of the exhaust channel is connected with an exhaust pipe, and the two exhaust pipes are connected with a vacuum pump through a pipeline.

[0008] As a further preferred embodiment of the technical solution: a heating plate is fixedly connected to the inside of each of the two heating chambers, and the capillary tube passes through the surface of the heating plate.

[0009] As a further preferred embodiment of the technical solution: a tire lip groove is provided on the inner wall of the mold cavity, and a plurality of raised blocks are fixedly connected to the interior of the mold cavity.

[0010] As a further preferred embodiment of the technical solution: the surfaces of the two piston rods are fixedly connected with an annular limit block, and the bottom of the connecting rod is fixedly connected to the top of the annular limit block.

[0011] As a further preferred embodiment of the present technical solution: the piston cylinder and one side of the nitrogen channel are respectively connected with a nitrogen inlet pipe and a nitrogen exhaust pipe, and the nitrogen inlet pipe and the nitrogen exhaust pipe are both connected with a solenoid valve.

[0012] As a further preferred embodiment of the present technical solution: a supporting mechanism is provided at the bottom of the mold, and the supporting mechanism includes a base plate, a gantry and a fixed frame. The gantry is fixedly connected to the top of the base plate, and the bottom of the gantry is fixedly connected to a cylinder through the fixed frame, and the lower end of the piston rod of the cylinder is fixedly connected to the top of the upper mold, and the inner side of the gantry is fixedly connected to a base, and a through hole is opened on the surface of the base, the lower mold is fixedly connected to the top of the base, and the outer side of the upper mold is fixedly connected to an annular sleeve, and the vacuum pump is fixedly connected to the top of the base.

[0013] In addition, the present invention also provides a method for using the central vulcanizing chamber structure of a hollow tire vulcanizer, comprising the following steps:

[0014] S1. Clean the vulcanization room and the tires to be vulcanized, wipe the inside of the upper and lower molds clean in advance, and clean the surface of the tires to be vulcanized;

[0015] S2, preheating, turning on the heating plate through the operating platform to preheat the upper and lower molds;

[0016] S3. Place the tire to be vulcanized into the lower mold, making sure the tire is on the surface of the column;

[0017] S4, mold closing, control the cylinder to work through the operating platform, and the piston rod of the cylinder covers the upper mold on the top of the lower mold;

[0018] S5, inflate and evacuate, inject high-temperature and high-pressure nitrogen into the piston cylinder and the mold cavity through the nitrogen inlet pipe, and start the vacuum pump to evacuate the gap between the tire surface and the peripheral wall of the mold cavity. When the air pressure and temperature in the piston cylinder and the mold cavity reach the preset value, control the solenoid valve on the nitrogen inlet pipe to close and stop inflation;

[0019] S6, exhaust, open the mold and take out the material. When the tire vulcanization reaches the preset time and the tire vulcanization is completed, the solenoid valve on the nitrogen exhaust pipe is controlled to evacuate the nitrogen in the piston cylinder and the mold cavity, and then the cylinder opens the mold to take out the tire.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: by supporting the inner edge of the tire with the slide bar, the fit between the tire and the inner wall of the mold cavity can be effectively improved, and high-temperature and high-pressure nitrogen can be effectively prevented from entering the gap between the tire and the mold cavity to cause nitrogen leakage, thereby improving the fit between the tire and the inner wall of the mold cavity, making the tire more evenly heated, and at the same time, the high-temperature and high-pressure nitrogen in the tire cooperates with the raised blocks to make the pattern formation of the tire tread more complete, effectively improving the appearance quality of the tread, and under the joint action of the vacuum pump and the high-temperature and high-pressure nitrogen, the tire is completely fitted to the inner wall of the mold cavity, and under the action of the restoring force of the spring, The contact end of the slide bar and the tire is separated, which effectively prevents the tire edge from being deformed due to the tire being softened by the high temperature and squeezed by the slide bar, effectively improving the tire quality. The design of the nitrogen mechanism can perform normal vulcanization processing on the tire without the need for a capsule, effectively reducing production costs, while saving the time for replacing capsules, greatly improving work efficiency, and effectively improving the vulcanization efficiency of the tire through the heating plate and high-temperature and high-pressure nitrogen, which has a positive effect on improving production efficiency. The heating plate and high-temperature and high-pressure nitrogen are used to heat and vulcanize both sides of the tire at the same time, effectively shortening the vulcanization time of the tire and effectively improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of the mold of the present invention;

[0022] Figure 2 It is a schematic diagram of the column structure of the present invention;

[0023] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of the middle A area;

[0024] Figure 4 For the present invention Figure 1 Schematic diagram of the structure of the middle B area;

[0025] Figure 5 It is a schematic diagram of the mold opening structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the gantry structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the nitrogen mechanism of the present invention.

[0028] In the figure: 1. mold; 2. upper mold; 3. lower mold; 4. mold cavity; 5. nitrogen mechanism; 6. first through groove; 7. second through groove; 8. piston cylinder; 9. connecting rod; 10. raised block; 11. first piston; 12. second piston; 13. piston rod; 14. nitrogen inlet pipe; 15. nitrogen exhaust pipe; 16. exhaust channel; 17. capillary; 18. support column; 20. heating chamber; 19. vacuum pump; 21. heating plate; 22. exhaust pipe; 23. spring; 24. nitrogen channel; 25. annular limit block; 26. tire lip groove; 27. base; 28. through hole; 29. ​​solenoid valve; 30. bottom plate; 31. gantry; 32. fixed frame; 33. cylinder; 34. annular sleeve; 35. column; 36. sleeve; 37. slide rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example

[0031] See also Figure 1-7 The present invention provides a technical solution: a central vulcanizing chamber structure of a hollow tire vulcanizer, comprising a mold 1, the mold 1 comprising an upper mold 2 and a lower mold 3, the upper mold 2 and the lower mold 3 form a mold cavity 4, and a nitrogen mechanism 5 is provided at the inner bottom of the lower mold 3;

[0032] The nitrogen mechanism 5 includes a column 35, a first through groove 6 and a second through groove 7 are provided on the surface of the column 35, a plurality of support columns 18 are fixedly connected in the first through groove 6 and the second through groove 7, a piston cylinder 8 and a nitrogen passage 24 are provided inside the column 35, a nitrogen inlet pipe 14 and a nitrogen exhaust pipe 15 are connected to one side of the piston cylinder 8 and the nitrogen passage 24, respectively, the nitrogen inlet pipe 14 and the nitrogen exhaust pipe 15 are connected to the solenoid valve 29, a first piston 11 and a second piston 12 are movably connected in the piston cylinder 8, and the first piston 1 1 and one side of the second piston 12 are fixedly connected with a piston rod 13, a spring 23 is sleeved on the surface of the piston rod 13, and the spring 23 is located in the piston cylinder 8. A plurality of sleeves 36 are fixedly connected to the surface of the column 35, and a slide rod 37 is movably inserted in the sleeve 36. The surfaces of the two piston rods 13 are evenly fixedly connected with connecting rods 9 matching the slide rods 37 around a circle, and the ends of the connecting rods 9 away from the piston rod 13 are fixedly connected to the surfaces of the plurality of slide rods 37 respectively, and the nitrogen channel 24 is connected to the piston cylinder 8;

[0033] By supporting the inner edge of the tire with the slide bar 37, the fit between the tire and the inner wall of the mold cavity 4 can be effectively improved, and the high-temperature and high-pressure nitrogen can be effectively prevented from entering the gap between the tire and the mold cavity 4, resulting in nitrogen leakage, thereby improving the fit between the tire and the inner wall of the mold cavity 4, making the tire heated more evenly, and at the same time, the high-temperature and high-pressure nitrogen in the tire cooperates with the raised block 10 to make the pattern formation of the tire tread more complete, thereby effectively improving the appearance quality of the tread. Under the joint action of the vacuum pump 19 and the high-temperature and high-pressure nitrogen, the tire is completely fitted with the inner wall of the mold cavity 4, and under the action of the restoring force of the spring 23, the slide bar 37 is separated from the contact end of the tire, thereby effectively preventing the tire edge from being deformed due to the high-temperature softening of the tire and being squeezed by the slide bar 37, thereby effectively improving the quality of the tire. The design of the nitrogen mechanism 5 can perform normal vulcanization processing on the tire without the need for a capsule, thereby effectively reducing production costs, while saving the time for replacing capsules, thereby greatly improving work efficiency, and effectively improving the vulcanization efficiency of the tire through the heating plate 21 and the high-temperature and high-pressure nitrogen, thereby playing a positive role in improving production efficiency.

[0034] The inner peripheral wall of the mold cavity 4 is connected with a plurality of capillaries 17. An exhaust channel 16 and a heating chamber 20 are provided in the upper mold 2 and the lower mold 3. A heating plate 21 is fixedly connected to the interior of the two heating chambers 20. The capillaries 17 penetrate the surface of the heating plate 21. By placing the heating plate 21 inside the upper mold 2 and the lower mold 3 for heating, the temperature rises quickly and the heat loss is reduced. The two exhaust channels 16 are connected with the mold cavity 4 through the capillaries 17. An exhaust pipe 22 is connected to one side of the exhaust channel 16. The two exhaust pipes 22 are connected with a vacuum pump 19 through a pipeline. When the vacuum pump 19 is working, a true state is formed between the tire and the inner wall of the mold cavity 4 through the capillaries 17.

[0035] The inner wall of the mold cavity 4 is provided with a tire lip groove 26, and a plurality of raised blocks 10 are fixedly connected inside the mold cavity 4. The tire lip groove 26 and the raised blocks 10 quickly form tire lip and tread patterns under high temperature and high pressure conditions.

[0036] The surfaces of the two piston rods 13 are fixedly connected with an annular limit block 25, and the bottom of the connecting rod 9 is fixedly connected to the top of the annular limit block 25. The annular limit block 25 limits the piston rod 13 and can effectively strengthen and fix the connecting rod 9.

[0037] A supporting mechanism is provided at the bottom of the mold 1, and the supporting mechanism includes a base plate 30, a gantry 31 and a fixed frame 32. The gantry 31 is fixedly connected to the top of the base plate 30, and the bottom of the gantry 31 is fixedly connected to a cylinder 33 through the fixed frame 32. The lower end of the piston rod of the cylinder 33 is fixedly connected to the top of the upper mold 2. The inner side of the gantry 31 is fixedly connected to a base 27, and a through hole 28 is opened on the surface of the base 27. The lower mold 3 is fixedly connected to the top of the base 27, and the outer side of the upper mold 2 is fixedly connected to an annular sleeve 34. The vacuum pump 19 is fixedly connected to the top of the base plate 30. The cylinder 33 provides power for opening and closing the mold 1. The annular sleeve 34 can effectively increase the closing speed of the upper mold 2 and the lower mold 3, so that the upper mold 2 and the lower mold 3 are not easily displaced.

[0038] The working principle or structural principle is that when the tire is vulcanized, high-temperature and high-pressure nitrogen enters the piston cylinder 8 through the nitrogen inlet pipe 14, the pressure of the piston cylinder 8 increases, and the high-temperature and high-pressure nitrogen pushes the first piston 11 and the second piston 12 to the two ends of the piston cylinder 8, and the spring 23 is squeezed and contracted. At the same time, the two piston rods 13 are pushed by the first piston 11 and the second piston 12 respectively, and the sliding rod 37 is driven to extend out of the sleeve 36 through the connecting rod 9. The end of the sliding rod 37 away from the sleeve 36 will support the inner edge of the tire, so that the surface edge of the tire is closely fitted with the inner side of the mold cavity 4 and the tire lip groove 26, and the capillary 17 is connected with the surface of the tire and the gap between the mold cavity 4, and the vacuum pump 19 works. The air in the gap between the surface of the tire and the mold cavity 4 is evacuated, and nitrogen is continuously charged into the piston cylinder 8 through the nitrogen channel 24. The high-temperature and high-pressure nitrogen in the piston cylinder 8 enters the tire through the nitrogen channel 24. At the same time, the nitrogen also enters the space of the piston cylinder 8 where the spring 23 is located. When the pressure in the tire reaches the preset pressure, the pressure between the first piston 11 and the second piston 12, the pressure in the tire, and the pressure in the space of the piston cylinder 8 where the spring 23 is located reach the same pressure. Under the restoring force of the spring 23, the two piston rods 13 shrink and reset into the piston cylinder 8, and the slide rod 37 retracts into the sleeve 36 under the action of the piston rod 13, so that the slide rod 37 is separated from the contact end of the tire;

[0039] By supporting the inner edge of the tire with the slide bar 37, the fit between the tire and the inner wall of the mold cavity 4 can be effectively improved, and the high-temperature and high-pressure nitrogen can be effectively prevented from entering the gap between the tire and the mold cavity 4, resulting in nitrogen leakage, thereby improving the fit between the tire and the inner wall of the mold cavity 4, making the tire heated more evenly, and at the same time, the high-temperature and high-pressure nitrogen in the tire cooperates with the raised block 10 to make the pattern formation of the tire tread more complete, thereby effectively improving the appearance quality of the tread. Under the joint action of the vacuum pump 19 and the high-temperature and high-pressure nitrogen, the tire is completely fitted with the inner wall of the mold cavity 4, and under the action of the restoring force of the spring 23, the slide bar 37 is separated from the contact end of the tire, thereby effectively preventing the tire edge from being deformed due to the high-temperature softening of the tire and being squeezed by the slide bar 37, thereby effectively improving the quality of the tire. The design of the nitrogen mechanism 5 can perform normal vulcanization processing on the tire without a capsule, thereby effectively reducing the production cost, while saving the time for replacing the capsule, thereby greatly improving the work efficiency, and effectively improving the vulcanization efficiency of the tire through the heating plate 21 and the high-temperature and high-pressure nitrogen, thereby having a positive effect on improving production efficiency.

[0040] In addition, the present invention also provides a method for using the central vulcanizing chamber structure of a hollow tire vulcanizer, comprising the following steps:

[0041] S1. Clean the vulcanization room and the tire to be vulcanized, wipe the inside of the upper mold 2 and the lower mold 3 clean in advance, and clean the surface of the tire to be vulcanized to prevent foreign matter from entering the tire material softened by high temperature and high pressure during the vulcanization process, thereby affecting the tire quality and appearance;

[0042] S2, preheating, turning on the heating plate 21 through the operating platform to preheat the upper mold 2 and the lower mold 3. The upper mold 2 and the lower mold 3 are preheated in advance for the first time, which can effectively dry the inside of the mold cavity 4, prevent abnormal vulcanization of the tire due to water vapor, and play a positive role in improving the processing quality of the tire;

[0043] S3, placing the tire, placing the tire to be vulcanized into the lower mold 3, ensuring that the tire is sleeved on the surface of the column 35, and the column 35 has a guiding effect on the tire;

[0044] S4, mold closing, the cylinder 33 is controlled to work through the operating platform, and the piston rod of the cylinder 33 covers the upper mold 2 on the top of the lower mold 3;

[0045] S5, inflate and evacuate, inject high-temperature and high-pressure nitrogen into the piston cylinder 8 and the mold cavity 4 through the nitrogen inlet pipe 14, and start the vacuum pump 19 to evacuate the gap between the tire surface and the peripheral wall of the mold cavity 4. When the air pressure and temperature in the piston cylinder 8 and the mold cavity 4 reach the preset value, control the solenoid valve 29 on the nitrogen inlet pipe 14 to close and stop inflating;

[0046] S6, exhaust, open the mold and take out the material. When the tire vulcanization reaches the preset time and the tire vulcanization is completed, the solenoid valve 29 on the nitrogen exhaust pipe 15 is controlled to evacuate the nitrogen in the piston cylinder 8 and the mold cavity 4, and then the cylinder 33 opens the mold 1 to take out the tire.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A central vulcanizing chamber structure of a hollow tire vulcanizing machine, comprising a mold (1), wherein the mold (1) comprises an upper mold (2) and a lower mold (3), wherein the upper mold (2) and the lower mold (3) form a mold cavity (4), Features: A nitrogen mechanism (5) is provided at the inner bottom of the lower mold (3); The nitrogen mechanism (5) comprises a column (35), a first through groove (6) and a second through groove (7) are provided on the surface of the column (35), a plurality of support columns (18) are fixedly connected in the first through groove (6) and the second through groove (7), a piston cylinder (8) and a nitrogen passage (24) are provided inside the column (35), a first piston (11) and a second piston (12) are movably connected in the piston cylinder (8), a piston rod (13) is fixedly connected to one side of the first piston (11) and the second piston (12), and the piston rod (13) is fixedly connected to the other side of the first piston (11) and the second piston (12). 3) is sleeved with a spring (23), the spring (23) is located in the piston cylinder (8), the surface of the column (35) is fixedly connected with a plurality of sleeves (36), the sleeves (36) are movably inserted with slide bars (37), the surfaces of the two piston rods (13) are evenly fixedly connected with connecting rods (9) matching the slide bars (37) around a circle, the ends of the connecting rods (9) away from the piston rods (13) are respectively fixedly connected to the surfaces of the plurality of slide bars (37), and the nitrogen channel (24) is connected to the piston cylinder (8); The inner peripheral wall of the mold cavity (4) is connected to a plurality of capillaries (17); an exhaust channel (16) and a heating chamber (20) are provided in the upper mold (2) and the lower mold (3); the two exhaust channels (16) are connected to the mold cavity (4) through the capillaries (17); one side of the exhaust channel (16) is connected to an exhaust pipe (22); and the two exhaust pipes (22) are connected to a vacuum pump (19) through a pipeline; The interiors of the two heating chambers (20) are both fixedly connected to a heating plate (21), and the capillary tube (17) penetrates the surface of the heating plate (21); The inner wall of the mold cavity (4) is provided with a tire lip groove (26), and a plurality of protruding blocks (10) are fixedly connected inside the mold cavity (4); The surfaces of the two piston rods (13) are fixedly connected with an annular limit block (25), and the bottom of the connecting rod (9) is fixedly connected to the top of the annular limit block (25); The piston cylinder (8) and one side of the nitrogen passage (24) are respectively connected to a nitrogen intake pipe (14) and a nitrogen exhaust pipe (15), and the nitrogen intake pipe (14) and the nitrogen exhaust pipe (15) are both connected to a solenoid valve (29).

2. A central vulcanizing chamber structure of a hollow tire vulcanizing machine according to claim 1, Features: A support mechanism is provided at the bottom of the mold (1), the support mechanism comprising a bottom plate (30), a gantry (31) and a fixing frame (32); the gantry (31) is fixedly connected to the top of the bottom plate (30); the bottom of the gantry (31) is fixedly connected to a cylinder (33) through the fixing frame (32); the lower end of the piston rod of the cylinder (33) is fixedly connected to the top of the upper mold (2); the inner side of the gantry (31) is fixedly connected to a base (27); a through hole (28) is provided on the surface of the base (27); the lower mold (3) is fixedly connected to the top of the base (27); the outer side of the upper mold (2) is fixedly connected to an annular sleeve (34); and the vacuum pump (19) is fixedly connected to the top of the bottom plate (30).

3. A method for using the central vulcanizing chamber structure of a hollow tire vulcanizer according to any one of claims 1 to 2, Features: The following steps are involved: S1. Clean the vulcanization chamber and the tire to be vulcanized, wipe the inside of the upper mold (2) and the lower mold (3) clean in advance, and clean the surface of the tire to be vulcanized; S2, preheating, turning on the heating plate (21) through the operating platform to preheat the upper mold (2) and the lower mold (3); S3, placing the tire to be vulcanized into the lower mold (3), ensuring that the tire is covered on the surface of the column (35); S4, mold closing, the cylinder (33) is controlled to work through the operating platform, and the piston rod of the cylinder (33) covers the upper mold (2) on the top of the lower mold (3); S5, inflating and vacuuming, injecting high-temperature and high-pressure nitrogen into the piston cylinder (8) and the mold cavity (4) through the nitrogen inlet pipe (14), and simultaneously starting the vacuum pump (19) to vacuum the gap between the tire surface and the peripheral wall of the mold cavity (4); when the air pressure and temperature in the piston cylinder (8) and the mold cavity (4) reach preset values, the solenoid valve (29) on the nitrogen inlet pipe (14) is controlled to close, and inflation is stopped; S6, exhaust, open the mold and take out the material. When the tire vulcanization reaches the preset time and the tire vulcanization is completed, the solenoid valve (29) on the nitrogen exhaust pipe (15) is controlled to evacuate the nitrogen in the piston cylinder (8) and the mold cavity (4), and then the cylinder (33) opens the mold (1) to take out the tire.

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