Complete nitrogen gas circulation type heating vulcanization system and vulcanization method

Abstract

The system is a complete nitrogen gas circulation type heating and vulcanization system and method. The system is equipped with a circulation path (7) in which a circulation pump (1), a gas heater (4), a nitrogen gas heating and uniformization device (6), a ring seat cylinder head, a bladder (31), a circulation buffer tank (15), and a filter (16) are sequentially arranged. The bladder (31) is provided in the ring seat cylinder head. The circulation buffer tank (15) is connected to a nitrogen replenishment path (33). The nitrogen replenishment path (33) is connected to a nitrogen production system (22), a low-pressure nitrogen gas buffer tank (23), a booster pump (24), a high-pressure nitrogen gas (HNG), and a filter (16). A gas buffer tank (25), a pressure reducing valve (26), and a nitrogen replenishment check valve (27) are provided in this order, a recovery line (20) is provided between the bladder (31) and the low-pressure nitrogen gas buffer tank (23), a vacuum pump (29) and a first recovery valve (28) are provided in the recovery line (20), second recovery valves (30) are connected in parallel to both the head and tail ends of the vacuum pump (29), a cooling line (32) is connected in parallel to the circulation line (7), and a first cooling valve (17), a second cooling valve (18), and a cooling device (19) are provided in the cooling line (32).

Description

[Technical Field]

[0001] This application claims priority to the following Chinese patent applications filed with the China Patent Office on October 18, 2023, bearing application number 202322798510.5; the Chinese patent application filed with the China Patent Office on October 18, 2023, bearing application number 202311354655.4; the Chinese patent application filed with the China Patent Office on October 18, 2023, bearing application number 202322801136.X; the Chinese patent application filed with the China Patent Office on October 18, 2023, bearing application number 202311351667.1; and the Chinese patent application filed with the China Patent Office on October 18, 2023, bearing application number 202322798509.2, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of complete nitrogen gas circulation type heat vulcanization of tires, for example, to a complete nitrogen gas circulation type heat vulcanization system and a vulcanization method. [Background technology]

[0003] The tire industry's vulcanization process often uses a steam and nitrogen co-vulcanization process. Steam provides the heat source for tire vulcanization, while nitrogen maintains pressure in the bladder. After the steam is added, the nitrogen gas is sealed inside the bladder, placing less demand on the injection inlet of the ring seat cylinder head. To save energy and protect the environment, a full nitrogen vulcanization process for tires has been proposed. In this process, nitrogen gas provides the heat and pressure, and during vulcanization, the nitrogen gas is continuously circulated through the vulcanization system by a circulation pump, maintaining the bladder at a constant temperature. Because nitrogen gas constantly circulates through the system, certain requirements are placed on the injection inlet and outlet of the ring seat cylinder head.

[0004] Gas heaters are electrical heating devices that primarily heat gas flow and are widely used in the fields of machinery and chemical industry. The gas passes through an electrical heating element under pressure, and the element uniformly absorbs heat based on the principle of fluid thermodynamics, allowing the temperature of the heated gas to meet the requirements of the applied process. The core principle of the heater is energy conversion, and gas heaters have the following commonly recognized shortcomings:

[0005] 1. When the gas flow rate is large, the heat from the heating element cannot be transferred to the gas quickly and evenly, resulting in uneven heating by the heater and a low heat exchange rate, which limits the gas flow rate of the heater and restricts the application range of the gas heater.

[0006] 2. Traditional heating methods have slow temperature rise and high energy consumption, which do not meet the current requirements for low-carbon environmental protection.

[0007] Compared with heated water and steam vulcanization, the co-vulcanization process with steam and nitrogen gas eliminates the need for water heating and pumping, reduces vulcanization costs, and uses low-pressure nitrogen gas for shaping, saving steam costs and solving the problem of insufficient pressure in steam vulcanization. Therefore, the co-vulcanization process with steam and nitrogen gas has relatively complete condition control and obvious advantages, and most tire manufacturers adopt this process for vulcanization.

[0008] However, the steam and nitrogen co-vulcanization process still relies on steam, which must be provided by a boiler. 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 prone to fluctuations, high energy consumption, and high losses, which are detrimental to the establishment of a sound, green, low-carbon, circular economic development system and the implementation of the important strategic decision to peak carbon dioxide emissions by 2030. Furthermore, during the vulcanization process, steam releases heat and generates condensation, which collects on the sides of the bladder, resulting in inconsistent vulcanization levels on the upper and lower sides of the tire, affecting tire vulcanization quality. Furthermore, the steam and nitrogen co-vulcanization process requires repeated introduction of a high-temperature medium during the pre-vulcanization stage to drain the condensation, which causes fluctuations in the internal pressure of the bladder. In contrast, steam and nitrogen co-vulcanization does not receive heat during the pressure-holding vulcanization stage, resulting in a drop in the temperature inside the bladder and a long pressure-holding time. Nitrogen gas can be produced using a pressure swing adsorption (PSA) or diaphragm system, and this type of nitrogen supply is very economical for tire manufacturers with a tire production volume of 20,000 tires per day or less. Summary of the Invention [Problem to be solved by the invention]

[0009] The present application solves the problem of ensuring uniform temperature and stable pressure in the bladder during the circulating vulcanization process using nitrogen gas, thereby providing a ring seat cylinder head that is advantageous for improving vulcanization quality.

[0010] The present application provides a gas heater that uses electromagnetic induction heating technology to solve the problems of low heat exchange rate of gas in the heater, long heating time, and high energy consumption. The guiding action of the guide cone and the rational structural distribution of the gas flow path in the porous heating body increase the heat exchange area with the gas, improving the gas heat exchange efficiency and increasing the output heating power.

[0011] This application provides a complete nitrogen gas circulation heating vulcanization system and vulcanization method that solves the shortcomings of the co-vulcanization process using steam and nitrogen gas, such as serious pollution, high energy consumption, large fluctuations in pre-vulcanization pressure, uneven temperatures between the upper and lower sides, and long pressure dwell times, and has the advantages of energy saving, environmental protection, small pressure fluctuations, uniform temperature, and high efficiency. [Means for solving the problem]

[0012] The present application is directed to The cylinder head spray head has two parts, a cylinder head spray head and a cylinder head base, which are connected to each other. The cylinder head spray head is designed with an injection inlet, a cylinder head nitrogen gas outlet, an intake groove, and an exhaust groove. The injection inlet is located on the side of the cylinder head spray head, and the injection direction of the injection inlet is tangent to the center circle and inclined obliquely downward. The nitrogen gas outlet is located on the upper surface of the cylinder head spray head, and the cylinder head nitrogen gas outlets are uniformly distributed along the circumferential direction. The intake groove is a circular arc groove, and the center of the circle is located on the cylinder head spray head. the plane on which the opening of the arc-shaped groove is located is parallel to the upper surface of the cylinder head spray head, the arc-shaped groove communicates with the injection inlet, the exhaust groove is a circular groove, and the inside of the intake groove communicates with the cylinder head nitrogen gas outlet, the inside of the cylinder head base is provided with a vertical intake communication groove and an exhaust communication groove which communicate with the intake groove and the exhaust groove respectively, and the side of the cylinder head base is provided with a cylinder head intake port and a cylinder head exhaust port which communicate with the intake communication groove and the exhaust communication groove respectively. To provide a ring seat cylinder head.

[0013] The present embodiment is a first cylindrical body and an intake port and an exhaust port located at both ends of the first cylindrical body, a porous heating body is provided within the first cylindrical body, the porous heating body is tightly attached to the inner wall of the first cylindrical body by interference fit, a plurality of gas flow paths are provided within the porous heating body, penetrating both left and right sides of the porous heating body, guide cones are provided at both ends of the porous heating body, conical tubes are welded to both ends of the first cylindrical body, the conical tubes are located outside the guide cones, slits between the inner wall of the conical tube and the outer wall of the guide cone form flow paths, both ends of the conical tube are fixedly connected to flanges, an opening in the center of the flange communicates with the flow paths to form the intake port and the exhaust port, and an electromagnetic heating insulation device is covered on the outer wall of the first cylindrical body; A gas heater is provided.

[0014] The present embodiment is a circulation path sequentially provided with a circulation pump, the gas heater, the nitrogen gas heating equalization device, the ring seat cylinder head, a bladder, a circulation buffer tank, and a filter; the bladder is provided in the ring seat cylinder head; a nitrogen replenishment path is connected to the circulation buffer tank in the circulation path; the nitrogen replenishment path sequentially provides a nitrogen production system, a low-pressure nitrogen gas buffer tank, a booster pump, a high-pressure nitrogen gas buffer tank, a pressure reducing valve, and a nitrogen replenishment check valve; a recovery path is provided between the bladder in the circulation path and the low-pressure nitrogen gas buffer tank of the nitrogen replenishment path; the recovery path is provided with a vacuum pump and a first recovery valve; second recovery valves are connected in parallel to both the head and tail ends of the vacuum pump; a cooling path is connected in parallel between the circulation pump and the circulation buffer tank in the circulation path; and the cooling path is provided with a first cooling valve, a second cooling valve, and a cooling device. We provide a complete nitrogen gas circulation heating vulcanization system.

[0015] The present embodiment is Introducing nitrogen gas into a complete nitrogen gas circulation heating and vulcanization system for tires; preheating the gas heater and the nitrogen gas heating homogenizer; Vulcanizing the nitrogen gas by heating and circulating it; cooling the bladder; recovering the nitrogen gas; A method for completely circulating nitrogen gas and performing heat vulcanization using the above system is provided. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view of a ring seat cylinder head according to the present invention; [Figure 2] FIG. 2 is a front structural view of the ring seat cylinder head of the present application. [Figure 3] FIG. 3 is a cross-sectional view of FIG. 2 taken along line MM. [Figure 4] 1 is a perspective view of a gas heater according to the present application; [Figure 5] FIG. 1 is a front view of the gas heater of the present application. [Figure 6] FIG. 3 is a structural schematic diagram of the cross section AA of FIG. 2. [Figure 7] FIG. 3 is another structural schematic diagram of the cross section AA of FIG. 2. [Figure 8] FIG. 3 is a structural schematic diagram of the cross section BB of FIG. 2. [Figure 9] 1 is a perspective structural view of a porous heating body according to the present invention; [Figure 10] FIG. 2 is a perspective structural view of the porous heating body and guide cone of the present application. [Figure 11] 1 is a schematic diagram of the overall structure of a complete nitrogen gas circulation type heating and vulcanization system according to the present application. [Figure 12] 1 is a structural schematic diagram of a nitrogen gas heating and homogenizing device according to the present application. [Figure 13] 2 is a partially enlarged structural schematic diagram of a heating unit in the nitrogen gas heating and homogenizing device according to the present application. FIG. [Figure 14] 2 is a structural schematic diagram of a first electromagnetic heating and heat-retaining device in the nitrogen gas heating and homogenizing device according to the present application. FIG. [Figure 15] 1 is a perspective structural schematic diagram of a gas heater according to the present application; [Figure 16]1 is a front structural view of a gas heater according to the present application. [Figure 17] 1 is a cross-sectional structural schematic diagram of a gas heater according to the present application. [Figure 18] FIG. 2 is a left side view of the structure of the gas heater according to the present application. [Explanation of symbols]

[0017] 1' Cylinder head spray head 2' Cylinder head base 11' injection inlet 12' Cylinder head nitrogen gas outlet 13' male thread 14' intake groove 15' exhaust duct 16' intake communication groove 17' Exhaust communication groove 21' cylinder head intake 22' cylinder head exhaust port 1” 1st barrel 2” porous heating element 3' guide cone 4' Intake 5' conical tube 6' exhaust outlet 7' Electromagnetic heating and insulation device 8' Insulated Cover 9' Gas flow path 10' bolt and screw holes 1 Circulation pump 2. First heating valve 3. First temperature sensor 4 Gas heater 5 Second temperature sensor 6 Nitrogen gas heating homogenizer 7 Circulation Route 8 Circulation Check Valve 9. First pressure sensor 10 Third temperature sensor 11 Fourth temperature sensor 12 Second pressure sensor 13 Back pressure valve 14 Second heating valve 15 Circulation buffer tank 16 filters 17 First cooling valve 18 Second cooling valve 19 Cooling device 20 Recovery Route 21 Quick exhaust valve 22 Nitrogen Production System 23 Low-pressure nitrogen gas buffer tank 24 Booster pump 25 High-pressure nitrogen gas buffer tank 26 Pressure reducing valve 27 Nitrogen refill check valve 28 First recovery valve 29 Vacuum Pump 30 Second recovery valve 31 Bladder 32 Cooling path 33 Nitrogen replenishment pathway 41 Nitrogen gas inlet 42 Aluminum die casting 43 Nitrogen gas outlet 44 Seal flange 45 2nd electromagnetic heating and insulation device 46 Pore structure 47 Third cylinder 61 Seal terminal 62 Heating unit 621 Hot Plate 622 Electromagnetic Coil 623 Distribution board 63 1st electromagnetic heating and insulation device 631 High Temperature Paper 632 Corner Bracket 633 Housing 634 Electromagnetic Heating Coil 64 Signal Receiving Unit 65 Control Unit 66 Control Panel 67 Fixation device 68 Seal flange 69 Gas inlet 610 Second cylinder 611 Gas outlet DETAILED DESCRIPTION OF THE INVENTION

[0018] The following examples are provided to illustrate the present application, and those skilled in the art can understand other advantages and effects of the present application from the contents disclosed herein. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in this specification based on different perspectives and applications without departing from the spirit of the present application. Where not inconsistent, the following examples and features in the examples can be combined with each other.

[0019] The drawings of the following embodiments are merely for explaining the basic concept of the present application in a schematic manner, and therefore the drawings are not made to represent the number, shape and size of components when actually implemented, but only show components relevant to the present application, and the form, number and scale of components when actually implemented can be changed arbitrarily, and the layout form of the components may also be more complex. [Example]

[0020] As shown in Figure 1, the ring-seat cylinder head comprises two interconnected parts: a cylinder head spray head 1' and a cylinder head base 2'. The cylinder head spray head 1' is the core part, and is equipped with an injection inlet 11', a cylinder head nitrogen gas outlet 12', an intake groove 14', and an exhaust groove 15'. The injection inlet 11' is located on the side of the cylinder head spray head 1', and its injection direction is inclined diagonally downward relative to the center circle. The cylinder head nitrogen gas outlets 12' are located on the top surface of the cylinder head spray head 1', and are uniformly distributed circumferentially. During nitrogen gas circulation vulcanization, nitrogen gas circulates from the side of the cylinder head spray head 1', injects diagonally downward relative to the center circle, enters the bladder 31, and after being mixed in the bladder 31, flows out of the cylinder head nitrogen gas outlet 12' at the top of the cylinder head spray head 1'. The intake groove 14' is an arcuate groove with a split head and tail, the center of which is on the central axis of the cylinder head spray head 1', the plane where the groove opening of the arcuate groove is located is parallel to the upper surface of the cylinder head spray head 1', and the arcuate groove communicates with the injection inlet 11'. The exhaust groove 15' is a circular groove, and the inside of the intake groove 14' communicates with the cylinder head nitrogen gas outlet 12'. The interior of the cylinder head base 2' is provided with a vertical intake communication groove 16' and an exhaust communication groove 17', which communicate with the intake groove 14' and the exhaust groove 15', respectively. A cylinder head intake port 21' and a cylinder head exhaust port 22' are provided on the side of the cylinder head base 2', which communicate with the intake communication groove 16' and the exhaust communication groove 17', respectively.

[0021] The diameter of the injection inlets 11' ranges from 1.8 to 4.0 mm, the downward inclination angle ranges from 15° to 30°, and the number of the injection inlets 11' ranges from 8 to 24.

[0022] The diameter of the cylinder head nitrogen gas outlets 12' ranges from 4 to 7 mm, and the number of the cylinder head nitrogen gas outlets 12' ranges from 8 to 24.

[0023] Preferably, the cylinder head spray head 1' and the cylinder head base 2' are connected by stainless steel bolts.

[0024] Preferably, a male screw 13' is designed on the cylinder head base 2' and is connected to an engagement mechanism.

[0025] The present invention employs the above-described structure and operates as follows: High-temperature, high-pressure nitrogen gas enters through the cylinder head intake port 21', passes upward through the intake communication groove 16', enters the intake groove 14', is then injected through the injection inlet 11', and enters the bladder. After mixing in the bladder, the nitrogen gas enters the exhaust groove 15' through the cylinder head nitrogen gas outlet 12', passes downward through the exhaust communication groove 17', and finally exits through the cylinder head exhaust port 22'. The gas then continues to circulate within the bladder under the action of an external heater and circulation pump, maintaining an appropriate temperature and stable pressure for bladder vulcanization and improving vulcanization quality.

[0026] The ring seat cylinder head of the present application is provided with an obliquely downward injection inlet tangent to the center circle, a cylinder head nitrogen gas outlet sewn along the circumferential direction, an intake groove, a communicating groove, etc., so that high-temperature, high-pressure nitrogen gas can be injected evenly along the periphery of the bladder wall as it enters the bladder. This allows the temperature of the inner wall of the bladder to be maintained at a constant level during the circulation vulcanization process, which is advantageous for improving tire quality, and satisfies the need for a ring seat cylinder head, which is a central mechanism in the pure nitrogen gas vulcanization process, where it is necessary to uniform the temperature of the bladder temple and stabilize the pressure. [Example]

[0027] As shown in Figures 1 to 3, this gas heater comprises a first cylindrical body 1" and an inlet 4' and an outlet 6' located at both ends of the first cylindrical body 1". A porous heating body 2" is provided within the first cylindrical body 1". The porous heating body 2" is tightly fitted to the inner wall of the first cylindrical body 1". A plurality of gas flow paths 9' are provided within the porous heating body 2" and penetrate both left and right sides of the porous heating body 2". Guide cones 3' are provided at both ends of the gas flow paths. A conical tube 5' is welded to both ends of the first cylindrical body 1". The conical tube 5' is located outside the guide cone 3' and a slit between the inner wall of the cone 3' and the outer wall of the guide cone 3' forms a flow path. Both ends of the conical tube 5' are fixedly connected to flanges. An opening in the center of the flange communicates with the flow paths and forms the inlet 4' and the outlet 6', respectively. An electromagnetic heating and insulation device 7' is covered on the outer wall of the first cylindrical body 1".

[0028] The present invention utilizes the rational porous structure of the porous heating body, the guide cones set on both ends of the porous heating body, and the conical tubes on both ends of the first cylindrical body. When gas enters through the intake port, the guiding action of the guide cones and conical tubes causes the gas to enter the gas flow path of the porous heating body evenly, where it is heated, and then flows out through the exhaust port, effectively improving the heat exchange efficiency between the gas and the heating element and increasing the output heating power of the heated gas, with a simple and reliable structure.

[0029] The porous heating element 2" is a cylindrical metal column, the central axis of which is a solid structure, and a plurality of gas flow channels 9' are provided around the solid structure on the outside of the central axis, as shown in Figure 3; alternatively, the porous heating element 2" is a cylindrical metal column, the central axis of which is a hollow structure, and a plurality of gas flow channels 9' are provided around the hollow structure on the outside of the central axis, as shown in Figure 4. The porous heating element 2" according to the present application can adopt two types of structures: solid and hollow. The solid structure increases the stored heat and improves heat exchange efficiency, while the hollow structure reduces the mass and makes it easier to transport and install.

[0030] Furthermore, the porous heating element 2" is composed of at least one cylindrical metal column. When the porous heating element has a solid structure, the metal columns are connected to each other and fixed together by bolts and screw holes 10" provided at the central axis of the column, as shown in Figures 5 and 6. The connection between the porous heating element and the guide cones at both ends is also achieved by a bolt and screw hole connection structure, or the guide cones are directly welded to the end surfaces of the porous heating element at both ends, as shown in Figure 7. When the porous heating element has a hollow structure, the metal columns are connected together and fixed together by welding, and the connection between the porous heating element and the guide cones at both ends can only be achieved by welding, with the tail of the guide cone inserted into the hollow chamber of the porous heating element and the outer wall of the guide cone welded to the inner wall of the hollow chamber of the porous heating element, as shown in Figures 4 and 7.

[0031] The porous heating body It is made of aluminum They are obtained by casting, machining, or metal 3D printing, and their outer diameter ranges from 120mm to 400mm, their length ranges from 150mm to 1000mm, and their gas flow path diameter ranges from 2mm to 8mm to achieve optimal heat exchange efficiency.

[0032] The outer wall of the first cylinder 1" is covered with an electromagnetic heating and insulation device 7', which uses the electromagnetic heating device described in the invention patent for "Electromagnetic Heating Body, Device and System for Half-Split Single-Screw Extruder" filed by the applicant, which is covered on the outer wall of the first cylinder to achieve electromagnetic heating for the first cylinder. Since no heating and insulation devices are installed on the outer walls of the conical tubes 5' at both ends of the first cylinder, in order to ensure the temperatures of the intake and exhaust ports, in this application, a heat-insulating cover 8' is further applied to the outer wall of the conical tube 5'.

[0033] When using the porous heater to heat gas, the heater is first preheated by generating a high-frequency alternating magnetic field through the heating and heat preservation device, and the surface of the first cylinder cuts the alternating magnetic field lines, generating an alternating current (i.e., a swirl) in the metal part at the bottom of the cylinder. The swirl causes the iron atoms in the first cylinder to move randomly at high speed, causing the atoms to collide and rub against each other, generating thermal energy and causing the first cylinder to self-heat. The first cylinder then transfers heat to the porous heater through thermal conduction. Once the porous heater reaches the set temperature, gas is introduced through the inlet and guided by the guide cone and the conical tube into the gas flow path of the porous heater, where it is heated. The gas then flows out of the outlet at the other end, completing the conversion of heat from the porous heater to gas.

[0034] As described above, in the present application, the guiding action of the guide cone and the rational structural distribution of the gas flow path of the porous heating body increase the heat exchange area with the gas, improve the heat exchange efficiency of the gas, and increase the output heating power. In addition, the electromagnetic heating and insulation device installed outside the heater can not only heat the first cylinder, but also keep the first cylinder warm, improving the gas temperature uniformity and heating speed, and the energy-saving effect of electromagnetic induction heating is significant.

[0035] In the present application, the first cylindrical body is made to self-heat by the electromagnetic heating insulation device, and the first cylindrical body transfers heat to the porous heating body by thermal conduction, and gas flows through the gas flow path of the porous heating body to absorb the heat, thereby achieving rapid heating and being applicable to a wider range of heating environments. [Example]

[0036] The present invention will be described below with reference to the drawings and examples. The present invention is a complete nitrogen gas circulation type heating and vulcanization system, which includes a circulation pump 1, Gas heater 4, a nitrogen gas heating homogenizing device 6, a ring seat cylinder head according to Example 1, a bladder 31, a circulation buffer tank 15, and a circulation path 7 having a filter 16 arranged in that order, and the bladder 31 is provided in the ring seat cylinder head.

[0037] A nitrogen replenishment path 33 is connected to the circulation buffer tank 15 in the circulation path 7, and a nitrogen production system (PSA) 22, a low-pressure nitrogen gas buffer tank 23, a booster pump 24, a high-pressure nitrogen gas buffer tank 25, a pressure reducing valve 26, and a nitrogen replenishment check valve 27 are sequentially provided in the nitrogen replenishment path 33.

[0038] A recovery path 20 is provided between the bladder 31 in the circulation path 7 and the low-pressure nitrogen gas buffer tank 23 of the nitrogen replenishment path 33, and a vacuum pump 29 and a first recovery valve 28 are provided in the recovery path 20, and a second recovery valve 30 is connected in parallel to both the head and tail ends of the vacuum pump 29.

[0039] A cooling path 32 is connected in parallel between the circulation pump 1 and the circulation buffer tank 15 in the circulation path 7, and a first cooling valve 17, a second cooling valve 18 and a cooling device 19 are provided in the cooling path 32.

[0040] A first pressure sensor 9, a third temperature sensor 10, a fourth temperature sensor 11 and a second pressure sensor 12 are installed at the inlet and outlet of the bladder 31, respectively, to monitor the pressure conditions inside the bladder 31 and the temperature conditions during vulcanization, thereby adjusting the circulation flow rate of the circulation path 7 and the settings of the heating equipment under different operating conditions. A second heating valve 14 is installed between the bladder 31 and the circulation buffer tank 15, and a temperature sensor is installed at the outlet of the circulation buffer tank 15.

[0041] A quick exhaust valve 21 is provided between the bladder 31 and the circulation buffer tank 15 in the circulation path 7. The quick exhaust valve 21 serves to exhaust miscellaneous gases from the bladder 31 before the circulation heating vulcanization starts.

[0042] The circulation path 7 Gas heater A first temperature sensor 3 and a second temperature sensor 5 are provided at the entrance and exit of the 4. Gas heaterA first heating valve 2 is provided at the inlet of the nitrogen gas heating and homogenizing device 4. A circulation check valve 8 is provided at the outlet of the nitrogen gas heating and homogenizing device 6.

[0043] The circulation buffer tank 15 is covered with an electromagnetic heating device outside, and the heating and temperature setting can be selected to be turned on or off depending on the operating state of the nitrogen gas.

[0044] The circulation pump 1 includes, but is not limited to, a rotary pump, a roots pump, a cylinder pump, etc., and can stably circulate high-temperature, high-pressure nitrogen gas back and forth within the system, providing stable temperature and pressure for tire vulcanization.

[0045] The nitrogen gas heating homogenizing device 6 includes a cylindrical second cylinder 610, a heating unit 62, a first electromagnetic heating insulation device 63, a control unit 65, a fixing device 67 for connecting and fixing multiple heating units in series, a signal receiving unit 64 connected to the control unit for receiving signals from the heating unit, a control panel 66 connected to the control unit, a seal flange 68 with a stepped communicating groove, a gas inlet 69, a gas outlet 611, and a seal terminal 61, and the first electromagnetic heating insulation device 63 is covered on the outside of the second cylinder 610.

[0046] One end of the nitrogen gas heating and uniformizing device 6 is sealed by metal welding, and the other end is sealed by the seal flange 68, and the seal terminal 61 is welded into the stepped communicating groove in the seal flange 68.

[0047] The heating unit 62 includes at least one set, which is fixed to the axial cross 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 wiring board 623. A spiral wiring groove is formed in the wiring board 623, and the electromagnetic coil 622 is fixed in the spiral wiring 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, or porous metal or porous metal foam. The electromagnetic coil 622 is connected to the control unit 65 by a seal terminal 61 fixed to a seal flange. The signal receiving unit 64 is connected to the heating unit 62 by a thermocouple. The electromagnetic coil 622 heats the hot plate 621 by a high-frequency alternating current. Gas heater The high-temperature nitrogen gas flowing in from 4 passes through the porous structure of the hot plate 621, and the nitrogen gas is heated by the turbulent flow, and high-temperature, high-pressure nitrogen gas with a uniform temperature is obtained at the outlet, and then enters the bladder 31 through the ring seat cylinder head and is vulcanized.

[0048] The first electromagnetic heating and insulation device 63 is composed of two semicircular rings, connected via hinges and snap locks, and attached to the outer wall of the second cylindrical body 610. It includes a housing 633, corner brackets 632, an electromagnetic heating coil 634, and high-temperature paper 631. Heat-insulating cotton is filled between the housing 633 and the electromagnetic heating coil 634 (not shown in Figure 4), and the electromagnetic heating coil 634 is adhered to the inside of the heat-insulating cotton with high-temperature resistant adhesive. The high-temperature paper 631 is fixed by the corner brackets 632 at the innermost part of the electromagnetic heating and insulation device 63 and covers the electromagnetic heating coil 634.

[0049] The aforementioned Gas heaterThe interior of 4 has a lotus-root-like porous structure, and includes a nitrogen gas inlet 41, an aluminum die-casting 42, a nitrogen gas outlet 43, a sealing flange 44, a second electromagnetic heating insulation device 45, and a third cylindrical body 47, where a plurality of pore structures 46 are provided in the aluminum die-casting 42, penetrating both the left and right sides of the aluminum die-casting 42.

[0050] The aforementioned Gas heater The outside of the 4 is heated by a second electromagnetic heating and heat-retaining device 45 having the same structure as the first electromagnetic heating and heat-retaining device 63. Gas heater The third cylindrical body 47 of the fourth embodiment is heated, and the third cylindrical body 47 transfers the heat to the aluminum die casting 42 by thermal conduction. Gas heater The aluminum die casting 42 inside the 4 has a pore structure 46, which may be obtained by casting or machining the aluminum die casting 42. When nitrogen gas flows through the pore structure 46 of the aluminum die casting 42, it is rapidly heated. Gas heater The second temperature sensor 5 at the outlet of the Gas heater The temperature of the nitrogen gas coming out of 4 can be monitored, and the temperature of the nitrogen gas at the outlet can be monitored. Gas heater Adjust the temperature setting at 4.

[0051] The cooling path 32 can rapidly cool the high-temperature nitrogen gas coming out of the bladder 31, after which it is introduced into the circulation buffer tank 15 where it is heated to a low temperature, and then introduced into the bladder 31 via the circulation pump 1 where it is circulated and cooled.

[0052] The nitrogen replenishment path 33 separates and purifies nitrogen gas in the air, introduces it into a low-pressure nitrogen gas buffer tank 23, compresses it with a booster pump 24, introduces it into a high-pressure nitrogen gas buffer tank 25, and then flows into the circulation buffer tank 15 via a pressure reducing valve 26.

[0053] One end of the recovery line 20 is connected to a nitrogen replenishment line 33. A vacuum pump 29, a first recovery valve 28, and a second recovery valve 30 are provided on the recovery line 20.

[0054] The present application further provides a method for performing full nitrogen gas circulation heating and vulcanization of a tire using the above system, the method comprising the following steps:

[0055] In step 1, nitrogen gas is introduced into the tire's full nitrogen gas circulation heating and vulcanization system.

[0056] The nitrogen production system 22 is turned on and air is ventilated into the nitrogen production system 22. The nitrogen production system 22 introduces high-purity nitrogen gas into the low-pressure nitrogen gas buffer tank 23. The booster pump 24 is turned on and pressurizes the low-pressure nitrogen gas to form high-pressure nitrogen gas, which is then introduced into the high-pressure nitrogen gas buffer tank 25. The pressure reaches a predetermined value through the pressure reducing valve 26 and is then introduced into the nitrogen gas circulation buffer tank 15 through the nitrogen replenishment check valve 27.

[0057] In step 2, the rapid heating device and the nitrogen gas heating homogenizer are preheated.

[0058] The aforementioned Gas heater 4 and the electromagnetic heating of the nitrogen gas heating homogenizer 6 are turned on to preheat them, Gas heater 4 and the nitrogen gas heating homogenizer 6 are heated to a preheating temperature.

[0059] In step 3, nitrogen gas is heated and circulated to vulcanize the mixture.

[0060] The nitrogen gas whose pressure has reached a predetermined value is circulated and heated, the circulation pump 1 is turned on, the first heating valve 2 is turned on, and at the same time, the rapid exhaust valve 21 is turned on to exhaust the air in the bladder 31, and then the rapid exhaust valve 21 is turned off and the second heating valve 14 is turned on. Under the action of the circulation pump 1, the high-pressure nitrogen gas flows from the nitrogen gas circulation buffer tank 15 through the filter and enters the circulation pump 1, and then the nitrogen gas Gas heater4, the nitrogen gas temperature rises rapidly, and immediately after that, it enters the nitrogen gas heating and uniformizing device 6. Due to the turbulence and heating effect of the hot plate of the nitrogen gas heating and uniformizing device 6, the humidity and temperature uniformity of the high-pressure nitrogen gas at the outlet of the nitrogen gas heating and uniformizing device 6 reach the required values ​​for the operating conditions. Then, the nitrogen gas enters the ring seat cylinder head through the cylinder head inlet 21' of the ring seat cylinder head, and then enters the bladder 31 through its injection inlet 11' to undergo vulcanization. From the outlet of the bladder 31, it flows into the nitrogen gas circulation buffer tank 15 through the cylinder head outlet 22' of the ring seat cylinder head, and then enters the next circulation until the vulcanization stage is completed.

[0061] In step 4, the bladder is cooled.

[0062] The first heating valve 2 and the second heating valve 14 are turned off, and the first cooling valve 17 and the second cooling valve 18 are turned on. The high-pressure, high-temperature nitrogen gas leaves the bladder 31 through the circulation pump 1, and then the temperature of the nitrogen gas is reduced by the cooling device. The circulation buffer tank 15 heats the nitrogen gas to a low temperature according to the operating conditions. The circulation pump 1 causes the nitrogen gas to enter the ring seat cylinder head through the cylinder head intake port 21' of the ring seat cylinder head, and then directly enters the bladder 31 through its injection inlet 11', gradually cooling the bladder 31.

[0063] In step 5, the nitrogen gas is recovered.

[0064] After vulcanization is completed, the circulation 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 gas in the bladder 31 flows into the low-pressure nitrogen gas buffer tank 23 due to the differential pressure. After the pressure is balanced, the second recovery valve 30 is turned off and the vacuum pump 29 is turned on to evacuate the bladder 31 and recover the remaining nitrogen gas into the low-pressure nitrogen gas buffer tank 23.

[0065] The set pressure of the pressure reducing valve 26 in the nitrogen replenishment path 33 is the pressure under operating conditions when vulcanizing the bladder 31, and when the pressure in the circulation path 33 is lower than the set pressure of the pressure reducing valve 26, the nitrogen gas in the high-pressure nitrogen gas buffer tank 25 is replenished into the circulation buffer tank 15 via the nitrogen replenishment check valve 27.

[0066] In this embodiment, through rational route design, valve body control and temperature setting, ideal pressure and temperature can be provided at each stage of tire vulcanization, which is beneficial to ensuring vulcanization quality. Furthermore, through the self-circulation of nitrogen gas, energy is utilized rationally, energy waste is significantly reduced, and efficiency is significantly improved.

[0067] The first electromagnetic heating and keeping warm device 63 and the second electromagnetic heating and keeping warm device 45 used in this embodiment 3 have the same structure as the electromagnetic heating and keeping warm device 7' in the embodiment 2. do .

Claims

1. It comprises two parts, a cylinder head spray head (1') and a cylinder head base (2'), which are connected to each other, and the cylinder head spray head (1') is designed with an injection inlet (11'), a cylinder head nitrogen gas outlet (12'), an intake groove (14'), and an exhaust groove (15'); The injection inlet (11') is provided on the side surface of the cylinder head spray head (1'), and the injection direction of the injection inlet (11') is inclined obliquely downward in contact with the center circle, The cylinder head nitrogen gas outlets (12') are provided on the upper surface of the cylinder head spray head (1'), and the cylinder head nitrogen gas outlets (12') are uniformly distributed along the circumferential direction; The intake groove (14') is an arc-shaped groove, the center of the circle is on the central axis of the cylinder head spray head (1'), the plane on which the groove opening of the arc-shaped groove is located is parallel to the upper surface of the cylinder head spray head (1'), and the arc-shaped groove communicates with the injection inlet (11'); The exhaust groove (15') is a circular groove and communicates with the cylinder head nitrogen gas outlet (12') inside the intake groove (14'); A vertical intake communication groove (16) and an exhaust communication groove (17') are provided inside the cylinder head base (2'), which communicate with the intake groove (14') and the exhaust groove (15'), respectively. A cylinder head intake port (21') and a cylinder head exhaust port (22') are provided on the side surface of the cylinder head base (2'), which communicate with the intake communication groove (16') and the exhaust communication groove (17'), respectively. Ring seat cylinder head.

2. The diameter of the injection inlet (11') is in the range of 1.8 to 4.0 mm, the downward inclination angle is in the range of 15° to 30°, and the number of the injection inlets (11') is in the range of 8 to 24.

2. The ring seat cylinder head according to claim 1.

3. The diameter range of the cylinder head nitrogen gas outlet (12') is 4 to 7 mm, and the number range of the cylinder head nitrogen gas outlet (12') is 8 to 24.

2. The ring seat cylinder head according to claim 1.

4. The cylinder head spray head (1') and the cylinder head base (2') are connected with stainless steel bolts.

2. The ring seat cylinder head according to claim 1.

5. The cylinder head base (2') is designed with a male thread (13').

2. The ring seat cylinder head according to claim 1.

6. The device comprises a first cylindrical body (1") and an intake port (4') and an exhaust port (6') located at both ends of the first cylindrical body (1"). A porous heating body (2") is provided within the first cylindrical body (1"), and the porous heating body (2") is tightly fitted to the inner wall of the first cylindrical body (1") by interference fit. A plurality of gas flow paths (9') are provided within the porous heating body (2"), penetrating both left and right sides of the porous heating body (2"), guide cones (3') are provided at both ends of the porous heating body (2"), conical tubes (5') are welded to both ends of the first cylindrical body (1"), and the conical tubes (5') is located outside the guide cone (3'), a slit between the inner wall of the conical tube (5') and the outer wall of the guide cone (3') forms a flow path, both ends of the conical tube (5') are fixedly connected to flanges, an opening in the center of the flange communicates with the flow path to form an intake port (4') and an exhaust port (6'), respectively, and an electromagnetic heating insulation device (7') is coated on the outer wall of the first cylindrical body (1"). Gas heater.

7. The porous heating body (2") is a cylindrical metal column, the central axis of which is a solid structural portion, and a plurality of gas flow paths (9') are provided outside the central axis of the column so as to surround the solid structural portion.

7. The gas heater according to claim 6.

8. The porous heating body (2") is a cylindrical metal column, the central axis of which is a hollow structure, and a plurality of gas flow paths (9') are provided outside the central axis of the column so as to surround the hollow structure.

7. The gas heater according to claim 6.

9. When the porous heating body (2") is composed of at least one cylindrical metal column, and the porous heating body (9') is composed of a plurality of cylindrical metal columns, adjacent cylindrical metal columns are connected to each other and fixed together by bolts and screw holes (10') provided at the central axis positions of the columns.

8. The gas heater according to claim 7.

10. The porous heating body (9') is composed of at least one cylindrical metal column, and when the porous heating body (9') is composed of a plurality of cylindrical metal columns, adjacent cylindrical metal columns are fixedly connected together by welding.

9. The gas heater according to claim 8.

11. The outer diameter of the porous heating body (9') is in the range of 120 mm to 400 mm, the length is in the range of 150 mm to 1000 mm, and the diameter of the gas flow path is in the range of 2 mm to 8 mm. A gas heater according to any one of claims 6 to 10.

12. The outer wall of the conical tube (5') is covered with a heat insulating cover (8').

7. The gas heater according to claim 6.

13. a circulation path (7) provided in the order of a circulation pump (1), a gas heater (4) according to any one of claims 6 to 12, a nitrogen gas heating and uniformizing device (6), a ring-seat cylinder head according to any one of claims 1 to 5, a bladder (31), a circulation buffer tank (15), and a filter (16), and the bladder (31) is provided in the ring-seat cylinder head; a nitrogen replenishment path (33) is connected to the circulation buffer tank (15) in the circulation path (7), and a nitrogen production system (22), a low-pressure nitrogen gas buffer tank (23), a booster pump (24), a high-pressure nitrogen gas buffer tank (25), a pressure reducing valve (26), and a nitrogen replenishment check valve (27) are sequentially provided in the nitrogen replenishment path (33); a recovery line (20) is provided between a bladder (31) in the circulation line (7) and a low-pressure nitrogen gas buffer tank (23) in the nitrogen replenishment line (33); a vacuum pump (29) and a first recovery valve (28) are provided in the recovery line (20); and second recovery valves (30) are connected in parallel to both ends of the vacuum pump (29); A cooling path (32) is connected in parallel between the circulation pump (1") and the circulation buffer tank (15) in the circulation path (7), and a first cooling valve (17), a second cooling valve (18), and a cooling device (19) are provided in the cooling path (32). Fully nitrogen gas circulation heating vulcanization system.

14. A first pressure sensor (9) and a third temperature sensor (10), and a fourth temperature sensor (11) and a second pressure sensor (12) are provided at the inlet and outlet of the bladder (31), respectively; a second heating valve (14) is provided between the bladder (31) and the circulation buffer tank (15); and a temperature sensor is provided at the outlet of the circulation buffer tank (15). The system of claim 13.

15. A quick exhaust valve (21) is provided between the bladder (31) and the circulation buffer tank (15) in the circulation path (7). The system of claim 13.

16. The circulation buffer tank (15) is covered with an electromagnetic heating device.

16. A system according to any one of claims 14 or 15.

17. A first temperature sensor (3) and a second temperature sensor (5) are provided at the inlet and outlet of the gas heater (4) in the circulation path (7), a first heating valve (2) is provided at the inlet of the rapid heating device (4), and a circulation check valve (8) is provided at the outlet of the nitrogen gas heating homogenizing device (6). The system of claim 13.

18. The nitrogen gas heating and uniformizing device (6) includes a cylindrical second cylinder (610), a heating unit (62), a first electromagnetic heating and heat-retaining device (63), a control unit (65), a fixing device (67) configured to connect and fix a plurality of the heating units in series, a signal receiving unit (64) connected to the control unit for receiving signals from the heating units, a control panel (66) connected to the control unit, a seal flange (68) having a stepped communication groove, a gas inlet (69), a gas outlet (611), and a seal terminal (61), and the first electromagnetic heating and heat-retaining device (63) is covered on the outside of the second cylinder (610), One end of the nitrogen gas heating and uniformizing device (6) is sealed by metal welding, the other end is sealed by the seal flange (68), and the seal terminal (61) is welded into a stepped communicating groove in the seal flange (68), At least one set of the heating unit (62) is provided, and is fixed to the cross section along the axial direction of the second cylindrical body (610) by a fixing mechanism, and its edge is connected to the inner wall of the second cylindrical body (610). The heating unit (62) includes a hot plate (621), an electromagnetic coil (622), and a wiring board (623). A spiral wiring groove is opened in the wiring board (623), and the electromagnetic coil (622) is fixed in the spiral wiring groove. The hot plate (621) is placed on the electromagnetic coil (622). The hot plate (621) has a porous structure. The electromagnetic coil (622) is connected to the control unit (65) by a seal terminal (61) fixed to a seal flange. The signal receiving unit (64) is connected to the heating unit (62) by a thermocouple.

18. A system according to any one of claims 13 or 17.

19. The first electromagnetic heating and insulation device (63) is composed of two semicircular rings, connected via hinges and snap locks, and attached to the outer wall of the second cylindrical body (610). It includes a housing (633), corner brackets (632), an electromagnetic heating coil (634), and high-temperature paper (631). Heat-insulating cotton is filled between the housing (633) and the electromagnetic heating coil (634). The electromagnetic heating coil (634) is adhered to the inside of the heat-insulating cotton with high-temperature-resistant adhesive. The high-temperature paper (631) is fixed by the corner brackets (632) at the innermost part of the first electromagnetic heating and insulation device (63) and covers the electromagnetic heating coil (634).

20. The system of claim 18.

20. Introducing nitrogen gas into a complete nitrogen gas circulation heating vulcanization system; preheating the gas heater and the nitrogen gas heating homogenizer; Vulcanizing the nitrogen gas by heating and circulating it; cooling the bladder; and recovering the nitrogen gas. A method for performing complete nitrogen gas circulation type heat vulcanization using the system according to claim 13.

21. The set pressure of the pressure reducing valve (26) is the pressure in the operating state where the vulcanization action of the bladder (31) is performed, and when the pressure in the circulation path (7) is lower than the set pressure of the pressure reducing valve (26), the nitrogen gas in the high-pressure nitrogen gas buffer tank (25) is replenished into the circulation buffer tank (15) via a nitrogen replenishment check valve (27).

21. The method of claim 20.

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