Method for improving vulcanization efficiency and reducing over-vulcanization degree

Abstract

The invention belongs to the technical field of tire vulcanization, and particularly relates to a method for improving vulcanization efficiency and reducing overvulcanization degree, which comprises the following steps: S1, in the tire vulcanization process, nitrogen is used as a medium for positive vulcanization treatment; s2, after positive vulcanization is finished, reducing the internal pressure of the tire from 2.65 MPa to 0.5 MPa, and performing primary internal pressure relief to complete nitrogen recovery; s3, the internal pressure of the tire is reduced from 0.5 MPa to 0 MPa, and main pressure relief is completed; s4, the internal pressure of the tire is reduced from 0 MPa to-0.02 MPa, and vacuumizing operation is completed; s5, triggering a zero-pressure switch for detection, and completing the vulcanization process; s6, the vulcanizing machine unlocks the mold locking mechanism, and the vulcanizing machine pulls up the upper mold cavity of the mold through the mold opening mechanism to complete the mold opening action; wherein in the step S3 or the step S4, the mold closing force pressure relief operation is started, and the mold closing pressure is reduced to 0 KN from the standard pressure. By designing the discharge time of the post-vulcanization process and optimizing the mold closing pressure relief time of the mold, the purposes of reducing the over-vulcanization degree, saving the energy loss and improving the vulcanization efficiency can be achieved during tire vulcanization.

Description

Technical Field

[0001] The present application belongs to the technical field of tire vulcanization, and specifically relates to a method for improving vulcanization efficiency and reducing the degree of over-sulfurization. Background Art

[0002] In the tire manufacturing process, vulcanization is a key process step, which directly affects the performance and quality of the tire. The traditional vulcanization process has some problems, such as low vulcanization efficiency, large energy loss, and difficult to control the degree of over-sulfurization. These problems not only affect the production efficiency of the tire, but may also lead to unstable tire performance and affect product quality.

[0003] At present, the industry generally pays attention to the design of the discharge time of the post-vulcanization process and the optimization of the mold clamping pressure relief time. These optimization measures are aimed at reducing the degree of oversulfurization of the tire, saving energy loss, and improving the vulcanization efficiency. However, the existing optimization methods still have some limitations. For example, during the vulcanization process, the control of the internal pressure is not precise enough, which may lead to uneven internal structure of the tire; the pressure relief process after the vulcanization is not efficient, which prolongs the entire production cycle; improper timing of the clamping force pressure relief operation may affect the molding quality of the tire.

[0004] In addition, there is room for improvement in the selection of vulcanization media in the existing technology. The traditional vulcanization media may not meet the requirements of high efficiency and energy saving, affecting the precise control of the vulcanization process. At the same time, the pressure adjustment process after the vulcanization is lack of refined management, making it difficult to achieve a fast and efficient production rhythm.

[0005] In view of the above problems, the existing technology needs to be improved urgently. Summary of the invention

[0006] The technical problem to be solved by the present application is to provide a method for improving vulcanization efficiency and reducing the degree of oversulfurization during vulcanization. By designing the discharge time of the post-vulcanization process and optimizing the mold clamping pressure relief time, the purpose of reducing the degree of oversulfurization, saving energy loss and improving the vulcanization efficiency can be achieved during tire vulcanization.

[0007] This application is implemented in this way. A method for improving vulcanization efficiency and reducing the degree of oversulfurization, comprising the following steps: S1: During the tire vulcanization process, nitrogen is used as the medium for positive vulcanization treatment; S2: After the positive vulcanization is completed, the internal pressure of the tire is reduced from 2.65 MPa to 0.5 MPa, and the initial internal pressure is released to complete the nitrogen recovery; S3: Reduce the internal pressure of the tire from 0.5 MPa to 0 MPa to complete the main pressure relief; S4: reduce the internal pressure of the tire from 0 MPa to -0.02 MPa to complete the vacuum operation; S5: Trigger the zero pressure switch detection to complete the vulcanization process; S6: The vulcanizer unlocks the mold locking mechanism, and the mold opening mechanism of the vulcanizer pulls up the upper cavity of the mold to complete the mold opening action; Wherein, in step S3 or step S4, the mold clamping force pressure relief operation is started to reduce the mold clamping pressure from the standard pressure to 0 KN.

[0008] Furthermore, in step S2, the time for reducing the internal pressure of the tire from 2.65 MPa to 0.5 MPa is optimized to 8-15 seconds.

[0009] Furthermore, in step S3, the time for reducing the internal pressure of the tire from 0.5 MPa to 0 MPa is optimized to 5-7 seconds.

[0010] Furthermore, in step S4, the time for reducing the internal pressure of the tire from 0 MPa to -0.02 MPa is optimized to 6-8 seconds.

[0011] Furthermore, in step S5, the clamping force pressure relief operation is advanced to after the positive vulcanization is completed and is performed synchronously with the pressure relief process.

[0012] Compared with the prior art, the present application has the following beneficial effects: The present application provides a method for improving vulcanization efficiency and reducing the degree of oversulfurization, which includes using nitrogen as a medium for positive vulcanization treatment, and by accurately controlling the process of reducing the internal pressure of the tire and the clamping force pressure relief operation, the vulcanization process is accurately controlled and the efficiency is improved. This method effectively solves the problems of low efficiency, large energy loss, and difficult to control oversulfurization degree in traditional vulcanization processes by optimizing the vulcanization medium, internal pressure control, and clamping force pressure relief operations, and has the advantages of improving vulcanization efficiency, reducing energy loss, accurately controlling the vulcanization process, and improving tire quality. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the present application more clear, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0014] With the development of tire manufacturing technology, tire vulcanization process is also being optimized. However, the existing vulcanization process has the problems of low vulcanization efficiency and high degree of oversulfurization, which affects the quality and performance of the tire. The traditional vulcanization process affects the vulcanization efficiency during the vulcanization process and is also prone to oversulfurization of the tire. In order to overcome these limitations, this application proposes a method for improving vulcanization efficiency and reducing the degree of oversulfurization. It includes: S1: During the tire vulcanization process, nitrogen is used as the medium for positive vulcanization treatment; S2: After the positive vulcanization is completed, the internal pressure of the tire is reduced from 2.65 MPa to 0.5 MPa, and the initial internal pressure is released to complete the nitrogen recovery; S3: Reduce the internal pressure of the tire from 0.5 MPa to 0 MPa to complete the main pressure relief; S4: reduce the internal pressure of the tire from 0 MPa to -0.02 MPa to complete the vacuum operation; S5: Trigger the zero pressure switch detection to complete the vulcanization process; S6: The vulcanizer unlocks the mold locking mechanism, and the mold opening mechanism of the vulcanizer pulls up the upper cavity of the mold to complete the mold opening action; Wherein, in step S3 or step S4, the mold clamping force pressure relief operation is started to reduce the mold clamping pressure from the standard pressure to 0 KN.

[0015] The present application uses nitrogen as a medium for positive vulcanization during the tire vulcanization process. After the positive vulcanization is completed, the internal pressure of the tire is gradually reduced, and the initial internal pressure relief, main pressure relief and vacuuming operations are performed to ensure the stability and efficiency of the vulcanization process. In step S3 or S4, the mold clamping force pressure relief operation is started to reduce the mold clamping pressure from the standard pressure to 0 KN. This operation helps to reduce the degree of over-sulfurization during vulcanization.

[0016] In the tire vulcanization process, there are usually problems of low vulcanization efficiency and over-vulcanization. By utilizing the higher thermal conductivity and stability of nitrogen, heat can be transferred more evenly and the vulcanization efficiency can be improved. After the positive vulcanization is completed, the stability and efficiency of the vulcanization process can be ensured by gradually reducing the internal pressure of the tire and performing preliminary internal pressure relief, main pressure relief and vacuuming operations. In particular, the clamping force pressure relief operation is moved from vacuuming to step S3 or S4, which can effectively reduce the degree of over-vulcanization and ensure the quality and performance of the tire.

[0017] As an inert gas, nitrogen can provide a more stable environment during the tire vulcanization process, avoid oxidation reactions, and improve vulcanization efficiency. After the positive vulcanization is completed, nitrogen can be effectively recovered and resource waste can be reduced by gradually reducing the internal pressure of the tire, performing initial internal pressure relief, main pressure relief, and vacuuming operations.

[0018] Specifically, the present application includes the following steps: During the vulcanization process of the tire, nitrogen is used as a medium for positive vulcanization treatment. After the positive vulcanization is completed, the internal pressure of the tire is reduced from 2.65 MPa to 0.5 MPa, and a preliminary internal pressure relief is performed to complete nitrogen recovery. The internal pressure of the tire is then reduced from 0.5 MPa to 0 MPa to complete the main discharge pressure. The internal pressure of the tire is then reduced from 0 MPa to -0.02 MPa to complete the vacuum operation. The zero pressure switch detection is triggered to complete the vulcanization process. The vulcanizer unlocks the clamping mechanism, and the vulcanizer pulls up the upper cavity of the mold by the mold opening mechanism to complete the mold opening action. In step S3 or step S4, the clamping force pressure relief operation is started to reduce the clamping pressure from the standard pressure to 0 KN.

[0019] The present application can effectively improve the vulcanization efficiency by using nitrogen as a medium for positive vulcanization treatment during the tire vulcanization process. After the positive vulcanization is completed, a series of pressure adjustment and pressure relief operations, including preliminary internal pressure relief, main pressure relief and vacuum operation, are performed to ensure the stability and efficiency of the vulcanization process. In particular, the clamping force pressure relief operation is moved from vacuuming to step S3 or S4 to perform the clamping force pressure relief operation, and the clamping pressure is reduced from the standard pressure to 0 KN. This operation helps to reduce the degree of oversulfurization during vulcanization, ensure the quality and performance of the tire, and shorten the post-vulcanization time. The lower the degree of oversulfurization of the tire, the better the tire performance. Through the mutual cooperation of these steps, the goals of improving the vulcanization efficiency and reducing the degree of oversulfurization during vulcanization are achieved.

[0020] In step S2, the time for reducing the internal pressure of the tire from 2.65 MPa to 0.5 MPa is optimized to 8-15 seconds; in step S3, the time for reducing the internal pressure of the tire from 0.5 MPa to 0 MPa is optimized to 5-7 seconds; in step S4, the time for reducing the internal pressure of the tire from 0 MPa to -0.02 MPa is optimized to 6-8 seconds.

[0021] By optimizing the time for the tire internal pressure to decrease in steps S2, S3 and S4, the pressure change during the vulcanization process can be more effectively controlled, thereby reducing the degree of oversulfurization. The setting of these optimized times not only helps to improve the vulcanization efficiency, but also saves energy and achieves better production results. Through the above technical means, the pressure change can be more accurately controlled during the vulcanization process, thereby effectively solving the problem of optimizing the discharge time and mold clamping pressure relief time in the post-vulcanization process, reducing oversulfurization and improving production efficiency.

[0022] Specifically, in step S2, the time for reducing the internal pressure of the tire from 2.65 MPa to 0.5 MPa is optimized to 8-15 seconds. The optimization of this time range can ensure the smooth progress of the initial internal pressure relief and ensure the effective recovery of nitrogen. In step S3, the time for reducing the internal pressure of the tire from 0.5 MPa to 0 MPa is optimized to 5-7 seconds. This optimized time can quickly complete the main pressure relief and avoid the phenomenon of vulcanization and oversulfurization caused by excessive internal pressure of the tire. In step S4, the time for reducing the internal pressure of the tire from 0 MPa to -0.02 MPa is optimized to 6-8 seconds. The optimization of this time range can ensure the smooth progress of the vacuum operation, thereby further reducing the residual pressure inside the tire.

[0023] By optimizing the pressure reduction time in these steps, the present invention not only improves the vulcanization efficiency, but also effectively reduces the phenomenon of over-sulfurization, thereby achieving the purpose of saving energy and improving production effect. Therefore, the present invention realizes more precise pressure control in the vulcanization process, significantly improving the quality and production efficiency of tire vulcanization.

[0024] In step S5, the clamping force pressure relief operation is advanced to after the positive vulcanization is completed and is performed synchronously with the pressure relief process. This technical feature enables the clamping force pressure relief to be performed at the same time as the vulcanization is completed, thereby reducing the over-sulfurization problem caused by excessive clamping force during the vulcanization process. This synchronous operation improves efficiency, reduces energy loss, and also achieves the purpose of reducing the degree of over-sulfurization.

[0025] Specifically, the clamping force pressure relief operation can be achieved by triggering the opening of the pressure relief valve at the end of positive vulcanization through the control system, thereby achieving synchronous pressure relief of the clamping force. Another way to achieve this is to add a step to the control program of the vulcanizer so that the clamping force pressure relief operation is performed immediately after the positive vulcanization is completed. In addition, the structure and material of the pressure relief valve can be optimized to improve the speed and stability of pressure relief, thereby better achieving the effect of synchronous pressure relief.

[0026] By advancing the clamping force pressure relief operation to after the positive vulcanization is completed and performing it synchronously with the pressure relief process, the over-vulcanization problem caused by excessive clamping force during the vulcanization process can be effectively reduced, thereby improving vulcanization efficiency and reducing energy consumption. Compared with the existing technology, this technical solution significantly improves production efficiency and reduces production costs by performing the clamping force pressure relief operation synchronously, and has important practical application value.

[0027] The clamping force pressure relief operation is advanced to the end of positive vulcanization and is carried out synchronously with the pressure relief process. The function of this technical feature is to optimize the pressure relief time of the mold clamping pressure by early and synchronous pressure relief, thereby reducing the degree of over-sulfurization during tire vulcanization, improving vulcanization efficiency and saving energy loss. By performing the clamping force pressure relief operation immediately after the positive vulcanization is completed and synchronously with the pressure relief process, the post-vulcanization time can be effectively reduced.

[0028] The above-mentioned implementation method may include the following possible variations: First, by starting the clamping force pressure relief operation at the same time as the end of positive vulcanization, the pressure relief process and the end of positive vulcanization are seamlessly connected; second, an intelligent control system may be used to monitor the progress of the positive vulcanization process in real time, and start the clamping force pressure relief operation in advance when the positive vulcanization is about to end, so as to ensure synchronization; third, the pressure relief process can be made smoother and more efficient by optimizing the design and control procedures of the pressure relief valve.

[0029] This technical solution effectively reduces the time of post-vulcanization by immediately performing the pressure relief operation of the mold clamping force after the positive vulcanization is completed, and is performed synchronously with the pressure relief process, thereby reducing the degree of over-vulcanization during the tire vulcanization process, improving the vulcanization efficiency and saving energy loss. Compared with the prior art, the technical solution of this application has significant advantages in optimizing the pressure relief time of the mold clamping pressure, and can better meet the needs of actual production.

[0030] In one embodiment, the clamping force pressure relief operation starts in step S3 or step S4 to reduce the clamping pressure from the standard pressure to 0 KN.

[0031] The clamping force pressure relief operation plays a key role in the vulcanization process. By starting the clamping force pressure relief operation in step S3 or step S4, the clamping pressure can be reduced in time after the positive vulcanization is completed, thereby effectively reducing the degree of over-vulcanization. This technical means optimizes the timing and pressure of the clamping force pressure relief to ensure that the vulcanization process is more efficient, energy loss is reduced, and the vulcanization efficiency is improved. The clamping force pressure relief operation starts in step S3 or step S4 and can be carried out simultaneously with the pressure relief process, so that the clamping pressure is reduced from the standard pressure to 0 KN. This operation avoids the occurrence of over-vulcanization by releasing the clamping force in time, effectively improves the vulcanization efficiency, and saves energy.

[0032] The specific implementation method of starting the clamping force pressure relief operation in step S3 or step S4 includes: after the positive vulcanization is completed, the clamping force pressure relief operation is automatically triggered by the control system, so that the clamping pressure is gradually reduced from the standard pressure to 0 KN. Specifically, the opening time and pressure relief rate of the pressure relief valve can be set to ensure that the clamping force is reduced to 0 KN within a predetermined time. In addition, the clamping pressure can be monitored in real time by a sensor to ensure accurate control of the pressure relief process. As a preferred embodiment, different pressure relief curves can be preset in the control system to meet the requirements of different types of tire vulcanization.

[0033] The present application effectively solves the time optimization problem of the clamping force pressure relief operation by starting the clamping force pressure relief operation in step S3 or step S4. Compared with the prior art, the present application can timely reduce the clamping pressure after the positive vulcanization is completed to avoid the occurrence of over-vulcanization, thereby improving the vulcanization efficiency and saving energy. Therefore, the present application has significant advantages in improving the vulcanization efficiency and reducing the degree of over-vulcanization.

[0034] By carrying out the clamping force pressure relief operation in advance, it is carried out synchronously with the pressure relief process immediately after the positive vulcanization is completed. This technical feature reduces the over-sulfurization phenomenon caused by excessive clamping force during the vulcanization process by optimizing the mold clamping pressure relief time, thereby improving the vulcanization efficiency and saving energy loss. By carrying out the clamping force pressure relief operation in advance until after the positive vulcanization is completed and carrying it out synchronously with the pressure relief process, it can effectively solve the problem of optimizing the mold clamping pressure relief time during the tire vulcanization process. This solution improves the vulcanization process by reducing the degree of over-sulfurization, improving the vulcanization efficiency, and saving energy consumption.

[0035] On the basis of understanding the present application, the newly added technical features or steps of the clamping force pressure relief operation can be realized in the following way: after the positive vulcanization is completed, the clamping force pressure relief operation is started immediately, and it is carried out synchronously with the pressure relief process. Specifically, during the tire vulcanization process, nitrogen can be used as a medium for positive vulcanization treatment. After the positive vulcanization is completed, the internal pressure of the tire is gradually reduced, and the clamping force pressure relief operation is started while the nitrogen recovery, main pressure relief and vacuuming operations are completed, and the clamping force pressure relief operation is reduced from the standard pressure to zero. As a preferred embodiment, the clamping force pressure relief operation can be carried out in step S3 or step S4, and the clamping pressure is gradually reduced from the standard pressure to zero to ensure the synchronous implementation of the pressure relief process.

[0036] The present application also proposes that, in step S2, the time for reducing the internal pressure of the tire from 2.65 MPa to 0.5 MPa is optimized to 8-15 seconds; in step S3, the time for reducing the internal pressure of the tire from 0.5 MPa to 0 MPa is optimized to 5-7 seconds; in step S4, the time for reducing the internal pressure of the tire from 0 MPa to -0.02 MPa is optimized to 6-8 seconds. In step S5, the clamping force pressure relief operation is advanced to after the positive vulcanization is completed, and is carried out synchronously with the pressure relief process.

[0037] The design of the discharge time of the post-vulcanization process and the optimization of the mold clamping pressure relief time are solved by optimizing the pressure reduction time of steps S2, S3, and S4 and the early mold clamping pressure relief operation in step S5. These technical features can reduce the degree of over-vulcanization, save energy loss, and improve vulcanization efficiency by cooperating with each other.

[0038] Wherein, in step S2, the time for reducing the internal pressure of the tire from 2.65 MPa to 0.5 MPa is optimized to 8-15 seconds. Such time optimization can ensure that the recovery efficiency of nitrogen is high during the initial internal pressure relief process and avoid energy waste. In step S3, the time for reducing the internal pressure of the tire from 0.5 MPa to 0 MPa is optimized to 5-7 seconds. This optimized time can effectively complete the main pressure relief process and ensure the smooth progress of subsequent operations. In step S4, the time for reducing the internal pressure of the tire from 0 MPa to -0.02 MPa is optimized to 6-8 seconds. This optimized time can ensure the effectiveness of the vacuum operation and improve the vulcanization efficiency. In step S5, the clamping force pressure relief operation is advanced to after the positive vulcanization is completed, and it is carried out synchronously with the pressure relief process. Such a design can reduce unnecessary waiting time during the vulcanization process, thereby further improving the vulcanization efficiency.

[0039] The present application achieves the purpose of reducing the degree of oversulfurization, saving energy loss and improving the vulcanization efficiency during tire vulcanization by designing the discharge time of the post-vulcanization process and optimizing the mold clamping pressure relief time. Compared with the prior art, the technical solution of the present application optimizes the time and operation sequence of each step to make the entire vulcanization process more efficient and energy-saving, thereby improving the quality and production efficiency of tire products.

[0040] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for improving vulcanization efficiency and reducing the degree of oversulfurization, characterized in that: The following steps are involved: S1: During the tire vulcanization process, nitrogen is used as the medium for positive vulcanization treatment; S2: After the positive vulcanization is completed, the internal pressure of the tire is reduced from 2.65 MPa to 0.5 MPa, and the initial internal pressure is released to complete the nitrogen recovery; S3: Reduce the internal pressure of the tire from 0.5 MPa to 0 MPa to complete the main pressure relief; S4: reduce the internal pressure of the tire from 0 MPa to -0.02 MPa to complete the vacuum operation; S5: Trigger the zero pressure switch detection to complete the vulcanization process; S6: The vulcanizer unlocks the mold locking mechanism, and the mold opening mechanism of the vulcanizer pulls up the upper cavity of the mold to complete the mold opening action; Wherein, in step S3 or step S4, the mold clamping force pressure relief operation is started to reduce the mold clamping pressure from the standard pressure to 0 KN.

2. A method for improving vulcanization efficiency and reducing the degree of oversulfurization according to claim 1, characterized in that: In the step S2, the time for reducing the internal pressure of the tire from 2.65 MPa to 0.5 MPa is optimized to 8-15 seconds.

3. A method for improving vulcanization efficiency and reducing the degree of oversulfurization according to claim 1, characterized in that: In step S3, the time for reducing the internal pressure of the tire from 0.5 MPa to 0 MPa is optimized to 5-7 seconds.

4. A method for improving vulcanization efficiency and reducing the degree of oversulfurization according to claim 1, characterized in that: In step S4, the time for reducing the internal pressure of the tire from 0 MPa to -0.02 MPa is optimized to 6-8 seconds.

5. The method for improving vulcanization efficiency and reducing the degree of oversulfurization according to claim 1, characterized in that: In the step S5, the clamping force pressure relief operation is advanced to after the positive vulcanization is completed and is performed synchronously with the pressure relief process.