Rapid nitrogen exhausting device of vulcanizing machine

Abstract

The utility model relates to the technical field of tire vulcanization, and discloses a rapid nitrogen exhaust device of a vulcanizing machine, which comprises a tire, a gas inlet component for feeding nitrogen is arranged on the left side of the bottom of the tire, a runner pipe is fixedly connected to the right side of the bottom of the tire, and a lead-in pipe is fixedly connected to the right side of the runner pipe. A pneumatic control stop valve is installed outside the ingress pipe, a first air storage tank is fixedly connected to the right side of the ingress pipe, a water guide pipe is fixedly connected to the right side of the first air storage tank, a second air storage tank is fixedly connected to the right side of the water guide pipe, and a liquid level meter is installed at the top of the second air storage tank; a gas outlet assembly used for outputting nitrogen is arranged at the top of the first gas storage tank. According to the utility model, the nitrogen in the capsule can be quickly discharged, the phenomenon that the nitrogen is gathered at the upper part in the capsule due to the density characteristic is avoided, and the condition of non-uniform temperature in the capsule caused by non-uniform distribution of the nitrogen is further prevented.

Description

Technical Field

[0001] This utility model relates to the field of tire vulcanization technology, and in particular to a rapid nitrogen venting device for a vulcanizing machine. Background Technology

[0002] Tire vulcanization is a crucial step in tire manufacturing. It involves heating and pressurizing the rubber to transform its linear molecular structure into a three-dimensional network structure. The main process is placing the unvulcanized tire blank into a vulcanizing mold. The mold contains the desired tread pattern and shape for the finished tire. During vulcanization, a vulcanizing agent, typically sulfur or a sulfur-containing compound, is added. Under high temperature (usually around 140-180 degrees Celsius) and high pressure (around 10-20 MPa), sulfur bridges form between rubber molecules. These bridges tightly bind the rubber molecules together, altering the rubber's physical properties. Vulcanized tires exhibit significantly improved strength, elasticity, and wear resistance, allowing them to better adapt to complex road conditions. Furthermore, vulcanization also contributes to greater dimensional stability in tires.

[0003] The current tire vulcanization internal temperature process involves two main steps: First, nitrogen is used to set the tire to a certain pressure (0.1 MPa, at which point the circuit is closed) before the mold is closed. Second, superheated steam (170°C) is introduced into the bladder to maintain temperature and pressure (2.9 MPa, at which point the circuit is closed). Since nitrogen is used for setting the tire in the first step, nitrogen needs to be introduced during the vulcanization process. Firstly, due to its stable chemical properties and inert nature, nitrogen will not react with rubber or vulcanizing chemicals at high temperatures, effectively preventing rubber oxidation, blistering, scorching, and other problems that could degrade tire quality, ensuring tire strength, elasticity, and wear resistance. Secondly, nitrogen maintains stable pressure during vulcanization, ensuring uniform pressure on all parts of the tire, promoting precise molding of the rubber within the mold, and preventing uneven vulcanization, poor dimensional accuracy, and shape regularity.

[0004] However, the existing method of leaving residual nitrogen inside the capsule and mixing it with water has a fatal flaw: nitrogen has a lower density than superheated steam and will accumulate at the top inside the capsule, resulting in uneven temperature inside the capsule and affecting the quality of tire vulcanization. Therefore, in order to address the above shortcomings, a rapid nitrogen removal device for vulcanizing machines is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a rapid nitrogen venting device for a vulcanizing machine, which aims to improve the problem of uneven internal temperature of the bladder in some tires, affecting the quality of tire vulcanization.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A rapid nitrogen venting device for a vulcanizing machine includes a tire. A nitrogen inlet assembly is located on the left side of the tire's bottom. A flow pipe is fixedly connected to the right side of the tire's bottom. An inlet pipe is fixedly connected to the right side of the flow pipe. A pneumatically controlled shut-off valve is installed outside the inlet pipe. A first gas storage tank is fixedly connected to the right side of the first gas storage tank. A water guide pipe is fixedly connected to the right side of the water guide pipe. A second gas storage tank is fixedly connected to the right side of the second gas storage tank. A level gauge is installed on the top of the first gas storage tank. A nitrogen outlet assembly is located on the top of the first gas storage tank. A control assembly is located at the bottom of the second gas storage tank.

[0008] As a further description of the above technical solution:

[0009] The air intake assembly includes a guide pipe, the top of which is fixedly connected to the bottom left side of the tire. A three-way valve is installed on the outer bottom side of the guide pipe, the bottom of which is fixedly connected to an air intake pipe, and the right side of which is fixedly connected to a water intake pipe.

[0010] As a further description of the above technical solution:

[0011] The gas outlet assembly includes a gas outlet pipe, the bottom of which is fixedly connected to the top of the gas storage tank.

[0012] As a further description of the above technical solution:

[0013] The control component includes a water outlet pipe, the top of which is fixedly connected to the bottom of the second gas storage tank, and a manual control valve is installed on the outside of the water outlet pipe.

[0014] As a further description of the above technical solution:

[0015] The tire has a capsule inside, the top of the guide tube is fixedly connected to the inside of the capsule, and the top of the flow tube is fixedly connected to the inside of the capsule.

[0016] As a further description of the above technical solution: a control valve two is installed on the outside of the air outlet pipe, and a control valve three is installed on the bottom side of the outside of the flow pipe;

[0017] As a further description of the above technical solution: the nitrogen gas injected into the air inlet pipe makes the internal pressure of the capsule reach 0.1 MPa, and the superheated steam injected into the water inlet pipe has a temperature of 170°C;

[0018] As a further description of the above technical solution: after superheated steam is injected into the capsule, the pressure inside the capsule is kept at 2.9 MPa to maintain heat and pressure.

[0019] This utility model has the following beneficial effects:

[0020] In this invention, a guide pipe directs nitrogen flow to the capsule, and a three-way valve flexibly switches between nitrogen and vapor flow. During venting, the inlet pipe is equipped with a pneumatically controlled shut-off valve. During normal vulcanization and pressure holding, the valve is closed to ensure stable pressure. When venting is required, the electrical control system quickly opens the valve based on feedback, allowing nitrogen to flow rapidly to the first storage tank. The first storage tank utilizes its internal space to buffer the high-pressure impact of nitrogen and stabilize the flow rate, preventing venting obstruction. Simultaneously, a level gauge on the top of the second storage tank monitors the liquid level in real time and transmits data. Once the liquid level reaches the target, the system is notified to close the venting circuit and enter pressure holding, precisely controlling the venting process. This allows for rapid discharge of nitrogen from the capsule, eliminating the phenomenon of nitrogen accumulating at the top of the capsule due to its density characteristics. This prevents uneven temperature distribution inside the capsule caused by uneven nitrogen distribution, ensuring that the tire is in an ideal temperature environment throughout the vulcanization process. This greatly guarantees the quality of tire vulcanization and avoids vulcanization defects affecting tire performance. Attached Figure Description

[0021] Figure 1 This is a perspective view of a rapid nitrogen venting device for a vulcanizing machine proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the gas storage tank of a rapid nitrogen venting device for a vulcanizing machine proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of the gas storage tank of a rapid nitrogen venting device for a vulcanizing machine proposed in this utility model.

[0024] Legend:

[0025] 1. Tire; 2. Guide pipe; 3. Three-way valve; 4. Air inlet pipe; 5. Water inlet pipe; 6. Flow pipe; 7. Inlet pipe; 8. Pneumatic control shut-off valve; 9. Air tank one; 10. Water guide pipe; 11. Air tank two; 12. Level gauge; 13. Air outlet pipe; 14. Control valve two; 15. Control valve three; 16. Water outlet pipe; 17. Manual control valve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1 to 3This utility model provides an embodiment of a rapid nitrogen venting device for a vulcanizing machine, comprising a tire 1, with a capsule inside the tire 1. The capsule is made of a material with excellent high-temperature resistance, high-pressure resistance, and good sealing properties, providing a stable and reliable closed space for subsequent nitrogen filling and circulation. A nitrogen inlet assembly is located on the bottom left side of the tire 1, including a guide pipe 2. The top of the guide pipe 2 is fixedly connected to the bottom left side of the tire 1. The guide pipe 2 plays a role in precisely guiding the nitrogen flow direction throughout the entire inlet process, ensuring that nitrogen can be efficiently and evenly filled into all parts of the capsule. The top of the guide pipe 2 is fixedly connected to the inside of the capsule, and a three-way valve 3 is installed on the bottom outer side of the guide pipe 2. When nitrogen needs to be injected to start vulcanization preheating, the three-way valve 3 precisely adjusts the internal passage to introduce nitrogen from the inlet pipe 4; and when steam is needed for subsequent high-temperature and high-pressure vulcanization, superheated steam introduced by the water inlet pipe 5 is allowed to enter. The bottom of the three-way valve 3 is fixedly connected to the inlet pipe 4, which serves as the direct channel for nitrogen to enter the device. A water inlet pipe 5 is fixedly connected to the right side of the three-way valve 3. The water inlet pipe 5 is responsible for introducing superheated steam generated by an external steam source into the device. The outside of the water inlet pipe 5 is wrapped with high-efficiency heat insulation material to prevent heat loss. The nitrogen injected into the air inlet pipe 4 brings the internal pressure of the capsule to 0.1 MPa, and the temperature of the superheated steam injected into the water inlet pipe 5 is 170°C. A flow pipe 6 is fixedly connected to the bottom right side of the tire 1. The top of the flow pipe 6 is fixedly connected to the inside of the capsule, and an inlet pipe 7 is fixedly connected to the right side of the flow pipe 6. The inlet pipe 7 plays an important role in guiding the gas inside the capsule to the gas storage tank 9 with the help of a pneumatically controlled shut-off valve 8. A pneumatically controlled shut-off valve 8 is installed on the outside of the inlet pipe 7. The pneumatically controlled shut-off valve 8 receives signals from the electrical control system and is in the closed state during the normal vulcanization pressure holding stage to ensure that the pressure inside the capsule remains stable, so that the vulcanization reaction can continue to proceed under ideal pressure conditions. When rapid venting is required, the electrical control system controls the air pressure based on precise signals to open the valve core, and nitrogen flows rapidly to the gas storage tank 9. After superheated steam is injected into the capsule, the pressure inside the capsule is kept at 2.9 MPa to maintain the temperature and pressure.

[0028] When rapid venting is required, the electrical control system, based on a preset program or sensor feedback signals, controls the air pressure to open the valve core, allowing nitrogen to flow rapidly to the storage tank. Its fast response and excellent sealing ensure efficient and precise venting. Storage tank 1 (9) is fixedly connected to the right side of the inlet pipe 7. When nitrogen is rapidly vented from the capsule, it first flows into storage tank 1 (9), utilizing its internal space to mitigate the instantaneous high-pressure impact of the nitrogen and stabilize the gas flow rate. A water guide pipe 10 is fixedly connected to the right side of storage tank 1 (9), and storage tank 2 (11) is fixedly connected to the right side of water guide pipe 10. A level gauge 12 is installed on the top of storage tank 2 (11). The level gauge 12 accurately measures the liquid level inside storage tank 2 (11) by emitting a specific signal and receiving reflected waves. During rapid venting, the level gauge 12 transmits the liquid level data to the electrical control system in real time. When the liquid level reaches the set value, it means that the nitrogen in the capsule has been largely vented, and the system can then close the rapid venting circuit and enter the pressure holding stage. The top of gas storage tank 9 is equipped with a gas outlet assembly for discharging nitrogen. This assembly includes a gas outlet pipe 13, the bottom of which is fixedly connected to the top of gas storage tank 9. A control valve 14 is installed on the outside of the gas outlet pipe 13. When it is necessary to empty the nitrogen from gas storage tank 9 or perform system maintenance, the gas outlet pipe 13 is opened by operating control valve 14, allowing the nitrogen to be safely and orderly discharged to a designated area. The bottom of gas storage tank 11 is equipped with a control assembly, including a water outlet pipe 16, the top of which is fixedly connected to the bottom of gas storage tank 11. The water outlet pipe 16 is a dedicated channel for discharging excess liquid from gas storage tank 11. A manual control valve 17 is installed on the outside of the water outlet pipe 16, allowing the operator to manually rotate the valve handwheel to control the opening and closing of the water outlet pipe 16. Control valve 3 15 is installed on the bottom side of the outside of the flow pipe 6. Control valve 3 15 and manual control valve 17 are used to adjust and discharge the gas flow in the flow pipe 6 and the water in the gas storage tank 2 11 when a sudden minor pressure imbalance occurs in the equipment. This ensures that the entire vulcanizing machine's rapid nitrogen venting device is always operating in the best condition.

[0029] Working Principle: During operation, the rapid nitrogen venting device of this vulcanizing machine guides nitrogen flow into the capsule via the guide pipe 2. The external bottom three-way valve 3 allows for flexible switching between nitrogen and steam flow. The inlet pipe 4 is the nitrogen entry channel, and the right-side water inlet pipe 5 introduces superheated steam. The inlet pipe 7, via a pneumatically controlled shut-off valve 8, directs the gas from inside the capsule to the first gas storage tank 9. During normal vulcanization and pressure holding, the pneumatically controlled shut-off valve 8 is closed to ensure stable pressure. When rapid venting is required, the electrical control system relies on feedback control of the air pressure to open the pneumatically controlled shut-off valve 8, allowing nitrogen to flow rapidly to the first gas storage tank 9. The internal space of the first gas storage tank 9 buffers high-pressure impacts and stabilizes the flow rate. The right-side water guide pipe 10 of the first gas storage tank 9 connects to the second gas storage tank 11. The liquid level gauge 12 at the top of the second gas storage tank 11 monitors the liquid level in real time and transmits data to the electrical control system. When the liquid level reaches the set value, it means that the nitrogen has been basically vented, and the venting circuit is closed to enter pressure holding. When venting nitrogen or during maintenance, the second control valve 14 can be opened to safely release nitrogen. The bottom control assembly of gas storage tank 11 includes a water outlet pipe 16, which serves as a channel for draining excess liquid. The pipe is opened and closed by a manual control valve 17. Utilizing the density difference between supercooled water, hot water, and nitrogen, nitrogen is rapidly discharged upwards. Gas storage tank 11 acts as a pressure stabilizing buffer, while a level gauge 12 detects changes in the liquid level. Initially, shaped nitrogen enters both gas storage tanks simultaneously into the capsule, and the circuit is closed. Then, superheated steam is switched to maintain pressure, and the electrical control system simultaneously opens the rapid exhaust circuit to discharge nitrogen. When the level gauge 12 detects the set liquid level, it indicates that the nitrogen circulation is complete, and the circuit is closed to maintain pressure, thus achieving rapid discharge of nitrogen from the capsule.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rapid nitrogen venting device for a vulcanizing machine, comprising a tire (1), characterized in that: A nitrogen inlet assembly is provided on the bottom left side of the tire (1). A flow pipe (6) is fixedly connected to the bottom right side of the tire (1). An inlet pipe (7) is fixedly connected to the right side of the flow pipe (6). A pneumatic control shut-off valve (8) is installed on the outside of the inlet pipe (7). A first gas storage tank (9) is fixedly connected to the right side of the first gas storage tank (9). A water guide pipe (10) is fixedly connected to the right side of the water guide pipe (10). A second gas storage tank (11) is fixedly connected to the right side of the water guide pipe (10). A level gauge (12) is installed on the top of the second gas storage tank (11). An outlet assembly for outputting nitrogen is provided on the top of the first gas storage tank (9). A control assembly for control is provided at the bottom of the second gas storage tank (11).

2. The rapid nitrogen venting device for a vulcanizing machine according to claim 1, characterized in that: The air intake assembly includes a guide pipe (2), the top of which is fixedly connected to the bottom left side of the tire (1), a three-way valve (3) is installed on the outer bottom side of the guide pipe (2), an air intake pipe (4) is fixedly connected to the bottom of the three-way valve (3), and a water inlet pipe (5) is fixedly connected to the right side of the three-way valve (3).

3. The rapid nitrogen venting device for a vulcanizing machine according to claim 1, characterized in that: The gas outlet assembly includes a gas outlet pipe (13), the bottom of which is fixedly connected to the top of the gas storage tank (9).

4. The rapid nitrogen venting device for a vulcanizing machine according to claim 1, characterized in that: The control component includes a water outlet pipe (16), the top of which is fixedly connected to the bottom of the second gas storage tank (11), and a manual control valve (17) is installed on the outside of the water outlet pipe (16).

5. The rapid nitrogen venting device for a vulcanizing machine according to claim 2, characterized in that: The tire (1) has a capsule inside, the top of the guide tube (2) is fixedly connected to the inside of the capsule, and the top of the flow tube (6) is fixedly connected to the inside of the capsule.

6. The rapid nitrogen venting device for a vulcanizing machine according to claim 3, characterized in that: A control valve 2 (14) is installed on the outside of the air outlet pipe (13), and a control valve 3 (15) is installed on the bottom side of the outside of the flow pipe (6).

7. A rapid nitrogen venting device for a vulcanizing machine according to claim 5, characterized in that: The nitrogen gas injected through the air inlet pipe (4) brings the internal pressure of the capsule to 0.1 MPa, and the superheated steam injected through the water inlet pipe (5) has a temperature of 170°C.

8. A rapid nitrogen venting device for a vulcanizing machine according to claim 5, characterized in that: After superheated steam is injected into the capsule, the pressure inside the capsule is kept at 2.9 MPa to maintain the temperature and pressure.

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