A rubber product molding vulcanization method and system

Abstract

The present application relates to the field of compression vulcanization technology, and specifically to a method and system for compression vulcanization of rubber products. The method comprises: obtaining the vulcanization temperature of the rubber product during compression vulcanization; analyzing the degree of change in the vulcanization temperature at adjacent collection times of each collection time to obtain a vulcanization gain value at each collection time; dividing all the vulcanization gain values into multiple segmented subsequences, analyzing the differences in the vulcanization gain values within each segmented subsequence, and combining the cumulative degree of the vulcanization gain values within each segmented subsequence to obtain the vulcanization gain persistence of each segmented subsequence; adjusting the vulcanization duration during the compression vulcanization process based on the changing trend characteristics of the vulcanization gain persistence during the compression vulcanization process to obtain a vulcanization adjustment duration; and controlling the compression vulcanization time based on the vulcanization adjustment duration to obtain a compression-vulcanized rubber product. The present application can ensure the quality of vulcanized rubber products and reduce the production cost of rubber products.

Description

Technical Field

[0001] The present application relates to the field of compression vulcanization technology, and in particular to a method and system for compression vulcanization of rubber products. Background Art

[0002] Currently, rubber materials are typically vulcanized by compression molding under heating and pressure, combining them with a vulcanizing agent in a compression mold. This process transforms the linear structure of the vulcanized rubber into a network structure. Compression molding is a key process in the manufacture of rubber products, and its effectiveness directly impacts the quality of the product. Curing time is the primary factor influencing this effect. Accurately adjusting the curing time during compression molding can prevent under- or over-curing of the vulcanized rubber, effectively improving the quality of the vulcanized rubber product.

[0003] During the compression vulcanization process of rubber materials, a vulcanization reaction occurs, causing the rubber linear structure to gradually cross-link to form a vulcanized rubber with a three-dimensional network macromolecular structure. However, the existing technology often presets a fixed vulcanization time for compression vulcanization of rubber materials based on the thickness of the rubber product. This fails to fully consider the impact of the real-time changes in the vulcanization temperature during the compression vulcanization process on the vulcanization reaction rate, making the preset fixed vulcanization time unable to be effectively applied to the real-time compression vulcanization process, which can easily lead to problems of under-vulcanization or over-vulcanization of the vulcanized rubber product, thereby affecting the product quality of the vulcanized rubber product. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a method and system for molding and vulcanizing rubber products. The technical solutions adopted are as follows:

[0005] The present invention provides a method for molding and vulcanizing a rubber product, comprising the following steps:

[0006] Obtain the vulcanization temperature during the molding and vulcanization process of rubber products;

[0007] Analyze the change degree of the vulcanization temperature at the adjacent collection moments of each collection moment to obtain the vulcanization gain value at each collection moment;

[0008] Dividing all the vulcanization gain values into multiple segmented subsequences according to the peak points of the vulcanization gain values at all the acquisition moments, analyzing the differences in the vulcanization gain values within each segmented subsequence, and combining the accumulation of the vulcanization gain values within each segmented subsequence to obtain the vulcanization gain persistence of each segmented subsequence;

[0009] According to the change trend characteristics of the vulcanization gain durability during the compression vulcanization process, the vulcanization time during the compression vulcanization process is adjusted to obtain the vulcanization adjustment time;

[0010] The molding vulcanization time is controlled based on the vulcanization adjustment time to obtain the molded and vulcanized rubber product.

[0011] Preferably, the calculation method of the vulcanization gain value at each collection moment is:

[0012] ;

[0013] Where, is the vulcanization gain value at the tth acquisition moment in the vulcanization temperature time series. The vulcanization temperatures at all acquisition moments are arranged in chronological order to obtain the vulcanization temperature time series. is an exponential function with a natural constant as base, and are the positive number means in the first-order difference sequence and the second-order difference sequence of the sliding window sequence at the t-th acquisition moment.

[0014] Preferably, the method for acquiring the sliding window sequence is: setting a sliding window of a preset size with the vulcanization temperature at each collection moment in the vulcanization temperature time series as the center, and the vulcanization temperatures within the sliding window constitute the sliding window sequence at each collection moment.

[0015] Preferably, the step of dividing all the vulcanization gain values into a plurality of segmented subsequences further comprises:

[0016] The vulcanization gain sequence in the molding vulcanization process is obtained according to the vulcanization gain value, the peak points in the vulcanization gain sequence are extracted, and the vulcanization gain sequence is segmented using each peak point as a segmentation point to obtain each segmented subsequence.

[0017] Preferably, the vulcanization gain sequence is composed of vulcanization gain values at all acquisition moments arranged in chronological order.

[0018] Preferably, the calculation method of the vulcanization gain durability of each segmented subsequence is:

[0019] ;

[0020] Where, is the vulcanization gain persistence of the vth segment subsequence, is the sum of all elements in the vth segment subsequence, To avoid constants with zero denominators, is the number of elements in the vth segment subsequence, and They are the j-th and j-1-th elements in the v-th segment subsequence respectively.

[0021] Preferably, the calculation method for obtaining the vulcanization adjustment time is:

[0022] ;

[0023] Where, For the vulcanization adjustment time during the molding vulcanization process, Preset the vulcanization time for the molding vulcanization process. The duration of molding and vulcanization that has been carried out up to the current collection time. is the mean of all elements in the first-order difference sequence of the gain persistence sequence.

[0024] Preferably, the method for obtaining the gain persistence sequence is: normalizing the vulcanization gain persistences of all segmented subsequences, and arranging all normalized vulcanization gain persistences in chronological order to obtain the gain persistence sequence.

[0025] Preferably, the control of the molding vulcanization time includes:

[0026] The vulcanization adjustment time is subtracted from the compression vulcanization time that has been carried out up to the current collection time to obtain the remaining vulcanization adjustment time of the compression vulcanization process up to the current collection time. When the remaining vulcanization adjustment time is reached, the compression vulcanization will be stopped.

[0027] An embodiment of the present application also provides a rubber product molding and vulcanization system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of any one of the above-mentioned rubber product molding and vulcanization methods are implemented.

[0028] As can be seen from the above, the rubber product molding vulcanization method and system provided by this application have at least the following beneficial effects:

[0029] This application sets a sliding window and adopts a differential sequence analysis method to more accurately measure the vulcanization gain effect in a short period of time at the collection time, which is used to observe the actual vulcanization reaction in the early stage of compression vulcanization, so as to facilitate the subsequent avoidance of over-vulcanization of vulcanized rubber products due to a strong gain effect during the compression vulcanization process.

[0030] The present application segments the vulcanization gain sequence by peak points, and accurately measures the persistence characteristics of the vulcanization gain effect in different time periods based on the cumulative level of the vulcanization gain value and the magnitude of the continuous change level in each segmented subsequence. This allows the vulcanization time in the compression vulcanization process to be accurately adjusted based on the overall change trend of the vulcanization gain persistence, thereby avoiding the problem of under-vulcanization or over-vulcanization of vulcanized rubber products.

[0031] In the present application, the influence of the real-time change of the vulcanization temperature during the compression vulcanization process on the vulcanization reaction rate is fully considered, and the vulcanization time during the compression vulcanization process is accurately adjusted according to the overall change trend of the vulcanization gain durability, so that the adjusted vulcanization time is effectively applicable to the real-time compression vulcanization process, thereby ensuring the product quality of the vulcanized rubber product and reducing the production cost of the rubber product. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 This is a flow chart of the steps of a rubber product molding and vulcanization method provided in this application. DETAILED DESCRIPTION

[0034] To further illustrate the technical means and effectiveness of this application's implementation of the intended invention, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effectiveness of a method and system for compression vulcanization of rubber products proposed in this application. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0035] Unless otherwise specified and limited, terms such as "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the article or device comprising the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs.

[0036] The following describes in detail a specific scheme of a rubber product molding vulcanization method and system provided by the present application with reference to the accompanying drawings.

[0037] See also Figure 1, which shows a flow chart of a method for molding and vulcanizing a rubber product provided by one embodiment of the present application, comprising the following steps:

[0038] Step 1: Obtain the vulcanization temperature during the molding and vulcanization process of the rubber product.

[0039] In the process of compression vulcanization of rubber products, the rubber raw materials are conveyed to the vulcanizer through the feeding mechanism, and the rubber materials are compression vulcanized in the vulcanizer, so that the rubber linear structure is gradually cross-linked to form a three-dimensional network macromolecular structure of vulcanized rubber, and vulcanized rubber products are produced.

[0040] During the compression vulcanization process of the rubber product, the vulcanization temperature of the compression vulcanization process is collected in real time by a temperature sensor. The collection frequency is 1 Hz, and the collection time is half of the preset vulcanization time. The vulcanization temperatures at all collection moments are arranged in chronological order to obtain a vulcanization temperature time series during the compression vulcanization process. In this embodiment, the preset vulcanization time is 30 minutes. The implementer can set the preset vulcanization time adaptively according to the actual thickness of the rubber product.

[0041] Step 2: Analyze the degree of change of the vulcanization temperature at the neighboring collection moments of each collection moment to obtain the vulcanization gain value at each collection moment.

[0042] During the compression vulcanization process of rubber products, the vulcanization reaction rate of the rubber is closely related to the change in vulcanization temperature. The vulcanization time needs to be accurately adjusted according to the real-time change of the vulcanization temperature during the compression vulcanization process to avoid the problem of under-vulcanization or over-vulcanization of the vulcanized rubber products.

[0043] In order to analyze the short-term and drastic changes in the vulcanization temperature at each collection moment, a 1×31 sliding window is set with the vulcanization temperature at each collection moment in the vulcanization temperature time series as the center. The implementer can adaptively select the size of the sliding window according to the actual situation. If there are missing values in the elements of the sliding window, the mean filling method is used to fill the missing values to obtain the sliding window sequence of each collection moment in the vulcanization temperature time series.

[0044] Furthermore, the first-order difference sequence and the second-order difference sequence of the sliding window sequence are calculated respectively. The first-order difference sequence reflects the rate of change of the vulcanization temperature within the sliding window sequence, while the second-order difference sequence reflects the speed of the rate of change of the vulcanization temperature within the sliding window sequence. If the positive mean value in the first-order difference sequence and the second-order difference sequence is larger, it means that the dynamic rise of the vulcanization temperature in a short period of time is more significant, and the process of rubber compression vulcanization is more promoted, while the inhibitory effect on rubber vulcanization is smaller, making it more likely that the problem of excessive vulcanization time will occur during the compression vulcanization process.

[0045] Through the above analysis, the vulcanization gain value at each acquisition moment in the vulcanization temperature time series is calculated:

[0046] ;

[0047] Where, is the vulcanization gain value at the tth acquisition moment in the vulcanization temperature time series, is an exponential function with a natural constant as base, and are the positive number means in the first-order difference sequence and the second-order difference sequence of the sliding window sequence at the t-th acquisition moment.

[0048] The vulcanization gain value reflects the promoting effect of the real-time change of vulcanization temperature on compression vulcanization. The stronger the promoting effect of the real-time change of vulcanization temperature on compression vulcanization, the more conducive it is to accelerate the reaction process of rubber compression vulcanization. Then the vulcanization time needs to be adjusted to avoid over-sulfurization of vulcanized rubber products.

[0049] Furthermore, in this embodiment, for ease of understanding and expression, a sequence of vulcanization gain values at all acquisition moments in chronological order is recorded as a vulcanization gain sequence during compression vulcanization. The vulcanization gain sequence reflects the persistent change of the vulcanization gain effect during compression vulcanization. The stronger the persistence of the vulcanization gain effect, the more it can improve the effect of the rubber vulcanization reaction, thereby gradually cross-linking the rubber linear structure to form a network macromolecular structure of vulcanized rubber in a shorter time. At this time, it is more necessary to accurately adjust the vulcanization time to avoid over-vulcanization of the vulcanized rubber product.

[0050] Step 3: Divide all the vulcanization gain values into multiple segmented subsequences according to the peak points of the vulcanization gain values at all acquisition moments, analyze the differences in the vulcanization gain values within each segmented subsequence, and combine the cumulative degree of the vulcanization gain values within each segmented subsequence to obtain the vulcanization gain persistence of each segmented subsequence.

[0051] To analyze the persistence characteristics of the vulcanization gain effect during different time periods during the compression vulcanization process, the vulcanization gain sequence was input into the AMPD (Automatic Peak and Valley Detection) algorithm. The AMPD peak detection algorithm was used to obtain all peak points in the vulcanization gain sequence. The AMPD peak detection algorithm is a well-known technology and will not be described in detail.

[0052] The vulcanization gain values in the subsequence between each two adjacent peak points in the vulcanization gain sequence have clear increases and decreases, which can accurately analyze the persistence characteristics of the vulcanization gain effect in different time periods, and help to more accurately adjust the vulcanization time of mold vulcanization in the subsequent process, thereby avoiding the problems of under-vulcanization or over-vulcanization of vulcanized rubber products.

[0053] Therefore, the peak points in the vulcanization gain sequence are used as segmentation points to realize segmented processing of the vulcanization gain sequence, and the segmented subsequences of the vulcanization gain sequence in the molding vulcanization process are obtained. The segmented subsequences of the vulcanization gain sequence reflect the persistence characteristics of the vulcanization gain effect in different time periods. If the cumulative level of the vulcanization gain value in the segmented subsequence of the vulcanization gain sequence is higher and the change level of the vulcanization gain value in the adjacent time period is smaller, it means that the vulcanization gain effect is at a higher and more stable level in the time period corresponding to the segmented subsequence, and it can better reflect the persistence characteristics of the vulcanization gain effect in this time period.

[0054] Through the above analysis, the vulcanization gain durability of each segmented subsequence is calculated:

[0055] ;

[0056] Where, is the vulcanization gain persistence of the vth segment subsequence, is the sum of all elements in the vth segment subsequence, To avoid a constant with a denominator of zero, its value range is (0.001, 0.1). In this embodiment, the value is 0.001. is the number of elements in the vth segment subsequence, and They are the j-th and j-1-th elements in the v-th segment subsequence respectively.

[0057] The vulcanization gain durability reflects the persistence characteristics of the vulcanization gain effect caused by the change in vulcanization temperature during the compression vulcanization process. The greater the persistence characteristics of the vulcanization gain effect caused by the change in vulcanization temperature, the faster the real-time compression vulcanization process is. The more accurately the vulcanization time should be adjusted during the compression vulcanization process to avoid over-vulcanization of vulcanized rubber products.

[0058] Step 4: According to the changing trend characteristics of the vulcanization gain durability during the compression vulcanization process, the vulcanization time during the compression vulcanization process is adjusted to obtain the vulcanization adjustment time.

[0059] Generally speaking, if the overall change in the durability of the vulcanization gain in all time periods during the compression vulcanization process shows an upward trend, it indicates that the compression vulcanization treatment effect on the rubber product in the process is better. In order to avoid the phenomenon of over-sulfurization of the vulcanized rubber product in the later stage of compression vulcanization, the vulcanization time in the compression vulcanization process should be shortened. On the contrary, if the overall change in the durability of the vulcanization gain in all time periods during the compression vulcanization process shows a downward trend, it indicates that the compression vulcanization treatment effect on the rubber product in the process is worse. In order to avoid the phenomenon of under-sulfurization of the vulcanized rubber product in the later stage of compression vulcanization, the vulcanization time in the compression vulcanization process should be increased.

[0060] Furthermore, in order to be able to more accurately and effectively adjust the vulcanization time in the compression vulcanization process in the future, the vulcanization gain persistence of all segmented subsequences in the compression vulcanization process is normalized. There are many ways of normalization: exponential normalization, range normalization, or Z-score normalization, etc. This embodiment does not specifically limit this. This embodiment adopts the exponential normalization method and arranges all the normalized vulcanization gain persistences in chronological order to obtain a gain persistence sequence. The gain persistence sequence reflects the change in gain persistence in the early process of compression vulcanization of the rubber material.

[0061] Through the above analysis, the first-order difference sequence of the gain persistence sequence is calculated, and the mean of all elements in the first-order difference sequence of the gain persistence sequence is statistically analyzed. If the mean is greater than 0, it means that the overall change of the vulcanization gain persistence presents an upward trend more significantly; conversely, the less the mean is than 0, the more significant the overall change of the vulcanization gain persistence presents a downward trend.

[0062] Through the above analysis, the vulcanization adjustment time in the compression vulcanization process is calculated:

[0063] ;

[0064] Where, For the vulcanization adjustment time during the molding vulcanization process, The preset vulcanization time in the molding vulcanization process is 30 minutes in this embodiment. The duration of molding and vulcanization that has been carried out up to the current collection time can be obtained through time record statistics. is the mean of all elements in the first-order difference sequence of the gain persistence sequence.

[0065] If the mean of the first-order difference series of the gain persistence series is The greater the value is than 0, the better the vulcanization effect of rubber in the early stage of compression vulcanization is. At this time, the greater the downward adjustment of the preset vulcanization time in the compression vulcanization process is, the more likely it is that the vulcanized rubber product will be over-sulfurized in the later stage of compression vulcanization. On the contrary, the mean value of the first-order difference sequence of the gain persistence sequence is The smaller the value is than 0, the worse the vulcanization effect on the rubber in the early stage of compression vulcanization. At this time, the greater the upward adjustment of the preset vulcanization time in the compression vulcanization process is, so as to avoid the phenomenon of insufficient vulcanization of vulcanized rubber products in the later stage of compression vulcanization.

[0066] Step 5: Controlling the compression vulcanization time based on the vulcanization adjustment time to obtain a compression-vulcanized rubber product.

[0067] Furthermore, in order to accurately control and adjust the vulcanization time during the compression vulcanization process of rubber, in this embodiment, the compression vulcanization time that has been carried out up to the current collection time is subtracted from the above-obtained compression vulcanization time to obtain the remaining vulcanization adjustment time of the compression vulcanization process up to the current collection time. Compression vulcanization is stopped until the remaining vulcanization adjustment time is reached. That is, when the remaining vulcanization adjustment time has not been reached, compression vulcanization of the rubber in the vulcanizer continues. When the remaining vulcanization adjustment time is reached, compression vulcanization is stopped, the switch device of the vulcanizer is disconnected, and the vulcanized rubber product is removed from the vulcanizer to obtain a compression-vulcanized rubber product.

[0068] Based on the same inventive concept as the above method, an embodiment of the present application also provides a rubber product molding and vulcanization system, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of any one of the above-mentioned rubber product molding and vulcanization methods are implemented.

[0069] It should be understood that the order in which the embodiments of the present application are presented is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. Furthermore, the foregoing descriptions of specific embodiments of this specification are provided. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential sequence shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0070] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0071] The above content is only an implementation method of the present application and is not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the scope of protection of the present application.

Claims

1. A method for vulcanizing a rubber product by molding, characterized in that: The following steps are involved: Obtain the vulcanization temperature during the molding and vulcanization process of rubber products; By analyzing the change degree of the vulcanization temperature at the neighboring collection moments of each collection moment, the vulcanization gain value at each collection moment is obtained, which is expressed as: ; Where, is the vulcanization gain value at the tth acquisition moment in the vulcanization temperature time series. The vulcanization temperatures at all acquisition moments are arranged in chronological order to obtain the vulcanization temperature time series. is an exponential function with a natural constant as base, and are the positive number means in the first-order difference sequence and the second-order difference sequence of the sliding window sequence at the t-th acquisition moment; According to the peak points of the vulcanization gain values at all acquisition moments, all the vulcanization gain values are divided into multiple segmented subsequences, and the differences in the vulcanization gain values within each segmented subsequence are analyzed. Combined with the accumulation degree of the vulcanization gain values within each segmented subsequence, the vulcanization gain persistence of each segmented subsequence is obtained, and the expression is: ; Where, is the vulcanization gain persistence of the vth segment subsequence, is the sum of all elements in the vth segment subsequence, To avoid constants with zero denominators, is the number of elements in the vth segment subsequence, and They are the jth and j-1th elements in the vth segment subsequence respectively; According to the changing trend characteristics of the vulcanization gain durability during the compression vulcanization process, the vulcanization time during the compression vulcanization process is adjusted to obtain the vulcanization adjustment time, which is expressed as: ; Where, For the vulcanization adjustment time during the molding vulcanization process, Preset the vulcanization time for the molding vulcanization process. The duration of molding and vulcanization that has been carried out up to the current collection time. is the mean of all elements in the first-order difference sequence of the gain persistence sequence; The molding vulcanization time is controlled based on the vulcanization adjustment time to obtain the molded and vulcanized rubber product.

2. A method for molding and vulcanizing a rubber product according to claim 1, characterized in that: The method for obtaining the sliding window sequence is as follows: taking the vulcanization temperature at each acquisition moment in the vulcanization temperature time series as the center, setting a sliding window of a preset size, and the vulcanization temperatures within the sliding window constitute the sliding window sequence at each acquisition moment.

3. A method for vulcanizing a rubber product by molding according to claim 1, characterized in that: The method further comprises dividing all the vulcanization gain values into a plurality of segmented subsequences: The vulcanization gain sequence in the molding vulcanization process is obtained according to the vulcanization gain value, the peak points in the vulcanization gain sequence are extracted, and the vulcanization gain sequence is segmented using each peak point as a segmentation point to obtain each segmented subsequence.

4. A method for vulcanizing a rubber product by molding as claimed in claim 3, characterized in that: The vulcanization gain sequence is composed of vulcanization gain values at all acquisition moments arranged in chronological order.

5. A method for molding and vulcanizing a rubber product according to claim 1, characterized in that: The method for obtaining the gain persistence sequence is as follows: normalizing the vulcanization gain persistence of all segmented subsequences, and arranging all normalized vulcanization gain persistences in chronological order to obtain the gain persistence sequence.

6. A method for molding and vulcanizing a rubber product according to claim 1, characterized in that: The control of the molding vulcanization time includes: The vulcanization adjustment time is subtracted from the compression vulcanization time that has been carried out up to the current collection time to obtain the remaining vulcanization adjustment time of the compression vulcanization process up to the current collection time. When the remaining vulcanization adjustment time is reached, the compression vulcanization will be stopped.

7. A rubber product molding and vulcanization system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the rubber product molding and vulcanization method according to any one of claims 1 to 6 are implemented.

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