A curing machine temperature drop delayed sulfur control method

Abstract

The present application relates to the field of tire vulcanization technology, and particularly relates to a kind of vulcanizing machine temperature drop delay sulfur control method, comprising: programmable logic controller receives the analog quantity of temperature;Programmable logic controller monitors and records the temperature drop duration of outer temperature in the temperature range of 170 DEG C to 176 DEG C in the whole vulcanization process, monitors and records the temperature drop duration of inner temperature in the temperature range of 199 DEG C to 201 DEG C in the high-pressure steam input step sequence;When the temperature drop duration of outer temperature or inner temperature reaches the temperature drop duration set by the set temperature of outer temperature or inner temperature, temperature drop alarm is carried out;When outer temperature temperature drop alarm, vulcanization delay is carried out in the high-pressure steam input and keep step sequence, when inner temperature temperature drop alarm, vulcanization delay is carried out in the high-pressure steam input step sequence, when outer temperature and inner temperature temperature drop alarm simultaneously, no vulcanization delay is carried out;After vulcanization delay is finished, continue to execute normal step sequence to open mold, solve the problem of tire scrapping caused by temperature drop in the vulcanization process.

Description

Technical Field

[0001] This invention relates to the field of tire vulcanization technology, and in particular to a method for controlling the temperature drop and prolonged vulcanization of a vulcanizing machine. Background Technology

[0002] Vulcanization is the final step in tire manufacturing. Heat is transferred from the vulcanizing medium through the bladder / metal mold into the tire, with the medium continuously circulating to maintain a high temperature. The transferred heat causes the rubber compounds to undergo chemical reactions, ultimately forming a highly elastic and durable material to meet the tire's performance requirements. Therefore, the temperature of the vulcanizing medium plays a crucial role in tire vulcanization.

[0003] The temperature control parameters in a vulcanizing machine are categorized into three types: 1. Hot plate temperature; 2. Mold temperature; 3. Internal temperature. These temperatures fluctuate during vulcanization, directly impacting the quality of tire vulcanization. In actual vulcanization, the temperature of each vulcanizing medium is rarely a stable, ideal value; temperature drops are common. However, it's relatively common for the temperature drop to be short-lived and the tire to return to normal. If tires are judged unusable solely based on the vulcanization kinetic curve, it would result in significant economic losses and energy waste for the company. To address tire scrapping caused by temperature drops during vulcanization, a method of delayed vulcanization is proposed to reduce or eliminate tire scrapping, thereby lowering the tire scrap rate. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a method for controlling the temperature drop during vulcanization in a vulcanizing machine, so as to solve the problem of tire scrapping caused by temperature drop during the vulcanization process.

[0005] To achieve the above objectives, the present invention provides a method for controlling the temperature drop and extended sulfurization process in a vulcanizing machine, comprising:

[0006] The programmable controller receives an analog signal of temperature.

[0007] The programmable logic controller monitors and records the duration of temperature drop in the external temperature range of 170°C to 176°C throughout the vulcanization process, and monitors and records the duration of temperature drop in the internal temperature range of 199°C to 201°C during the high-pressure steam introduction step.

[0008] A temperature drop alarm will be triggered when the duration of the temperature drop in the external or internal temperature reaches the set duration of the temperature drop in the external or internal temperature.

[0009] When the external temperature drops, high-pressure steam is introduced and vulcanization is delayed in sequence. When the internal temperature drops, high-pressure steam is introduced and vulcanization is delayed in sequence. When both the external and internal temperatures drop, vulcanization is not delayed.

[0010] After the vulcanization delay ends, continue with the normal procedure until the mold is opened.

[0011] Optionally, the external temperature includes the hot plate temperature and the mold sleeve temperature, and the internal temperature is the high-pressure steam temperature.

[0012] Optionally, the duration of the temperature drop is the cumulative sum of time within the monitored temperature range.

[0013] Optionally, the vulcanization delay is performed for an external temperature drop of no more than 5 minutes and an internal temperature drop of no more than 3 minutes, with a vulcanization delay time of 1 minute.

[0014] Optionally, the vulcanization delay is only performed when either the external or internal temperature drops to alarm; the vulcanization delay is not performed when both the external and internal temperatures drop to alarm simultaneously.

[0015] Optionally, when both the external temperature platen temperature and the mold sleeve temperature simultaneously trigger a temperature drop alarm, only one vulcanization delay will be performed.

[0016] Optionally, the programmable logic controller (PLC) can modify the delayed vulcanization program parameters, and the vulcanization information can be queried in the PLC's operation interface. The delayed vulcanization information is marked accordingly in the vulcanization information.

[0017] Optionally, the vulcanization information includes the tire's corresponding specifications, vulcanization conditions, and whether extended vulcanization is performed.

[0018] The beneficial effects of this invention are as follows: This solution monitors and records the temperature drop time of the external and internal temperatures during the vulcanization process. When the duration of the temperature drop of the external or internal temperature is not greater than the corresponding set temperature drop duration, delayed vulcanization is performed in the corresponding vulcanization step. This solves the problem of tire scrapping caused by temperature drop during the vulcanization process, thereby reducing tire scrapping and lowering the tire scrapping rate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a method for controlling the temperature drop and sulfur extension of a vulcanizing machine according to an embodiment of the present invention;

[0021] Figure 2 These are partial program diagrams of an embodiment of the present invention;

[0022] Figure 3 This is an electrical schematic diagram of an embodiment of the present invention;

[0023] Figure 4 This is a list diagram of the soft components used in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] In one embodiment, such as Figure 1 As shown, a method for controlling the temperature drop and sulfur extension of a vulcanizing machine includes:

[0027] The programmable controller receives an analog signal of temperature.

[0028] The programmable logic controller monitors and records the duration of temperature drop in the external temperature range of 170°C to 176°C throughout the vulcanization process, and monitors and records the duration of temperature drop in the internal temperature range of 199°C to 201°C during the high-pressure steam introduction step.

[0029] A temperature drop alarm will be triggered when the duration of the temperature drop in the external or internal temperature reaches the set duration of the temperature drop in the external or internal temperature.

[0030] When the external temperature drops, high-pressure steam is introduced and vulcanization is delayed in sequence. When the internal temperature drops, high-pressure steam is introduced and vulcanization is delayed in sequence. When both the external and internal temperatures drop, vulcanization is not delayed.

[0031] After the vulcanization delay ends, continue with the normal procedure until the mold is opened.

[0032] Based on the above settings, the programmable logic controller (PLC) can be effectively controlled to implement delayed vulcanization control of the corresponding medium. By using the special function instructions in the PLC for software programming, the problem of automatic delay of tire vulcanization temperature drop can be solved well, reducing tire scrap, improving product quality, and reducing tire scrap rate.

[0033] The external temperature includes the hot plate temperature and the mold sleeve temperature, while the internal temperature is the high-pressure steam temperature.

[0034] The duration of temperature drop is the cumulative sum of time within the monitored temperature range.

[0035] The vulcanization delay is carried out when the external temperature drop lasts for no more than 5 minutes and the internal temperature drop lasts for no more than 3 minutes, with a total vulcanization delay time of 1 minute.

[0036] When the temperature drop reaches the lower limit and the duration of the drop is no longer than the set duration, the delayed vulcanization lock is activated. Once the corresponding delayed vulcanization step is reached, the delayed vulcanization process begins. The external temperature is relatively uniform and continuous throughout the vulcanization process, requiring a longer judgment time. Whether the internal temperature meets the standard during the introduction of high-pressure steam and the preceding steps directly plays a crucial role in the tire's quality and rejection. The internal temperature requires more precise temperature control than the external temperature, with a shorter control time, and the final quality can be more accurately determined based on the temperature drop.

[0037] The vulcanization delay is only performed when either the external or internal temperature drops to alarm. If both the external and internal temperatures drop to alarm simultaneously, the vulcanization delay is not performed. When both the external and internal temperatures drop to alarm simultaneously, the tire is immediately deemed unusable and locked by the quality assurance department.

[0038] When both the external temperature platen temperature and the mold sleeve temperature drop simultaneously, a vulcanization delay will only be performed once.

[0039] The hot plate temperature is used to heat the base plate, and the mold sleeve temperature is used to heat the outer perimeter of the mold. Both are part of the external temperature control system, so when both the hot plate temperature and the mold sleeve temperature drop simultaneously, only one delayed vulcanization is performed.

[0040] The programmable logic controller (PLC) can modify the parameters of the delayed vulcanization program. Vulcanization information can be queried in the PLC's operation interface, and the delayed vulcanization information is marked accordingly in the vulcanization information.

[0041] Vulcanization information includes tire specifications, vulcanization conditions, and whether extended vulcanization is performed.

[0042] The control panel allows users to query vulcanization information (tire specifications, vulcanization conditions, whether extended vulcanization is performed, etc.), facilitating visual management and historical traceability.

[0043] In one embodiment, such as Figures 2 to 4 As shown: The PLC used is a Mitsubishi Q series PLC, and the programming software used is GX-Developer.

[0044] According to the above control method, add an address to the PLC. At the same time, in order to make the address more clearly expressed, compile the newly added soft component with comments. For example, the soft component R1809 is commented as setting the starting point for the external temperature drop detection step.

[0045] Based on the output section and control conditions of the original program control, design the control conditions of the new program, and do not cancel or affect the original program action design, such as adding the starting point R1809 of the external temperature drop detection step after the current step R3020;

[0046] After the program design is completed, actual simulation tests are conducted. The professional practice is to conduct a "capped pressure test". This process simulates the actual vulcanization process throughout, and the process conditions are no different from normal solid tire vulcanization. The difference is that there is no tire in the furnace, which is called "blind vulcanization".

[0047] After all vulcanization conditions meet the process requirements, the "blind vulcanization" process begins. After the mold is fully closed, the mode switch is switched to automatic, and the first vulcanization step begins. At this time, the air pressure shut-off valve controlling the external temperature is manually shut off, causing the external temperature to drop and triggering an alarm. When the external temperature drops to the range recorded by the control program, the air pressure shut-off valve is reopened. This process is repeated until the duration of the external temperature drop reaches the maximum duration. Then, the action is stopped. When the vulcanization step reaches the point where high-pressure steam is introduced and maintained, the delayed vulcanization begins, lasting for 1 minute. After the delayed vulcanization ends, the normal steps continue until the mold is opened.

[0048] By designing and conducting experiments on the internal temperature according to the above content, the same process can be obtained.

[0049] Experiments showed that the 4 million semi-steel tire project, with 50 tires per month operating at low temperatures, resulted in annual cost savings of over 180,000 yuan. This demonstrates that delayed vulcanization at low temperatures can achieve the expected results, improve tire wear caused by low temperatures, and yield significant economic benefits.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0051] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for controlling the temperature drop and sulfur extension of a vulcanizing machine, characterized in that, include: The programmable controller receives an analog signal of temperature. The programmable logic controller monitors and records the duration of temperature drop in the external temperature range of 170°C to 176°C throughout the vulcanization process, and monitors and records the duration of temperature drop in the internal temperature range of 199°C to 201°C during the high-pressure steam introduction step. A temperature drop alarm will be triggered when the duration of the temperature drop in the external or internal temperature reaches the set duration of the temperature drop in the external or internal temperature. When the external temperature drops, high-pressure steam is introduced and vulcanization is delayed in sequence. When the internal temperature drops, high-pressure steam is introduced and vulcanization is delayed in sequence. When both the external and internal temperatures drop, vulcanization is not delayed. After the vulcanization delay period ends, continue with the normal procedure until the mold is opened; The external temperature includes the hot plate temperature and the mold sleeve temperature, while the internal temperature is the high-pressure steam temperature.

2. The method for controlling the temperature drop and sulfur extension of a vulcanizing machine according to claim 1, characterized in that, The duration of temperature drop is the cumulative sum of time within the monitored temperature range.

3. The method for controlling the temperature drop and sulfur extension of a vulcanizing machine according to claim 1, characterized in that, The vulcanization delay is carried out when the external temperature drop lasts for no more than 5 minutes and the internal temperature drop lasts for no more than 3 minutes, with a total vulcanization delay time of 1 minute.

4. The method for controlling the temperature drop and sulfur extension of a vulcanizing machine according to claim 1, characterized in that, The vulcanization delay is only performed when either the external or internal temperature drops to alarm; it is not performed when both the external and internal temperatures drop to alarm simultaneously.

5. The method for controlling the temperature drop and sulfur extension of a vulcanizing machine according to claim 1, characterized in that, When both the external temperature platen temperature and the mold sleeve temperature drop simultaneously, a vulcanization delay will only be performed once.

6. The method for controlling the temperature drop and sulfur extension of a vulcanizing machine according to claim 1, characterized in that, The programmable logic controller (PLC) can modify the parameters of the delayed vulcanization program, and the vulcanization information can be queried in the PLC's operation interface. The delayed vulcanization information is marked in the vulcanization information.

7. The method for controlling the temperature drop and sulfur extension of a vulcanizing machine according to claim 6, characterized in that, The vulcanization information includes the tire's corresponding specifications, vulcanization conditions, and whether extended vulcanization was performed.

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