Method for controlling extrusion dimensional stability of tire rubber components

Abstract

The application provides a kind of tyre rubber part extrusion size stability control method, comprising: rubber from extruder extrusion enters four section shrinkage roller, the running speed of four section shrinkage roller gradually reduces;After being shrunk by four section shrinkage roller, the width and weight of rubber part are measured and monitored by front end measuring section;The rubber part meeting the range enters cooling water blowing section through uphill conveyor section, then enters lower water blowing section and rear end measuring section in turn through downhill conveyor section, and the rubber part meeting the range is cut and wound after being conveyed by winding conveyor section;Floating roller is installed between front end measuring section and uphill conveyor section, between uphill conveyor section and cooling water blowing section, between cooling water blowing section and downhill conveyor section, and between rear end measuring section and winding conveyor section, which is used to control the speed difference of rubber part passing through each section, improve the stability of rubber part size, improve the yield, reduce material waste and production cost.

Description

Technical Field

[0001] This invention relates to the field of tire manufacturing technology, and in particular to a method for controlling the dimensional stability of tire rubber components during extrusion. Background Technology

[0002] Currently, in tire manufacturing, the dimensional stability of extruded rubber components is mainly achieved through methods such as manually adjusting the extrusion line speed. While these methods can ensure the dimensional stability of extruded products to a certain extent, the following problems still exist:

[0003] First, uneven shrinkage: Due to inaccurate process control, the rubber parts shrink unevenly during the extrusion process, resulting in inconsistent product dimensions.

[0004] Second, large size fluctuations: Existing technology makes it difficult to ensure that the size of each glued component is consistent with the design size, resulting in large size fluctuations in the product.

[0005] Third, high scrap rate: Dimensional instability leads to a large number of scraps, increasing production costs and affecting production efficiency. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the above-mentioned technology and provide a method for controlling the dimensional stability of tire rubber components during extrusion.

[0007] Therefore, the present invention provides a method for controlling the dimensional stability of tire rubber components during extrusion, comprising the following steps:

[0008] S1. After the rubber compound is extruded from the extruder, it enters a four-section shrink roller conveyor, and the running speed of the four-section shrink roller conveyor gradually decreases.

[0009] S2. After the rubber component is shrunk by the four sections of shrinking rollers, the width and weight of the rubber component are measured and monitored by the front measuring section.

[0010] S3. The adhesive component that meets the set range enters the cooling and blowing section through the uphill conveyor belt section, and then enters the downhill conveyor belt section and the rear measuring section in sequence. The adhesive component that meets the set range is cut and wound after being conveyed by the winding conveyor belt section.

[0011] Floating rollers are installed between the front measuring section and the uphill conveyor belt section, between the uphill conveyor belt section and the cooling water blowing section, between the cooling water blowing section and the downhill conveyor belt section, and between the rear measuring section and the winding conveyor belt section. The floating rollers are used to control the speed difference of the adhesive component as it passes through the front and rear sections.

[0012] Preferably, a fixed length mark is made on the adhesive component, the shrinkage length of the adhesive component after passing through S1 to S3 is measured, and the shrinkage speed ratio of the shrinkage roller is determined based on the shrinkage length.

[0013] Preferably, the shrinkage rate is 8% to 10%.

[0014] Preferably, an angular displacement sensor is provided on the side of the floating roller. The angular displacement sensor transmits the signal of the detected change in the position of the floating roller to the main control console. The main control console adjusts the speed of each section before and after the floating roller according to the signal to ensure that the speeds of each section are synchronized.

[0015] Preferably, each section of the shrinkage roller conveyor consists of multiple rollers, the diameter of which gradually decreases from front to back.

[0016] Preferably, after the extrusion dimension of the rubber component exceeds the standard tolerance, the main control console fine-tunes the screw speed and linear speed of the extruder, as well as the shrinkage rate ratio. The fine-tuning range of the screw speed is ±1 r / min, the fine-tuning range of the linear speed is ±3 m / min, and the fine-tuning range of the shrinkage rate ratio is ±0.5%.

[0017] Preferably, the standard tolerances are: thickness ±0.3mm, width ±3mm, and weight ±3% for the adhesive component.

[0018] Preferably, both the front-end measurement section and the rear-end measurement section use a continuous scale and a width measuring camera to measure and monitor the weight and width of the rubber component, respectively. The continuous scale and the width measuring camera are both connected to the main control console. The main control console adjusts the weight and width of the pressed-out rubber component according to the signals transmitted by the continuous scale and the measuring camera.

[0019] The beneficial effects of the present invention are as follows: The present invention provides a method for controlling the dimensional stability of tire rubber components during extrusion, which has the following beneficial effects.

[0020] (1) Improved stability of rubber component dimensions: By adjusting the roller diameter ratio and shrinkage speed ratio of the shrinkage roller track, and dynamically adjusting the speed of each section before and after by the floating roller, the speed of each section is kept consistent. At the same time, under the action of the front and rear measuring sections, the width and weight of the rubber component can be measured and monitored in a timely manner. If the width and weight of the rubber component exceed the set standard range during the extrusion process, the main control system will receive the transmitted signal and adjust the screw speed and linear speed of the extruder according to the change logic of width / weight and screw speed / linear speed, so that the width / weight of the rubber component returns to the qualified range, thereby achieving the purpose of controlling the stability of the extrusion dimensions of the rubber component, improving the consistency of product quality, and improving product quality.

[0021] (2) Improved yield: Improved dimensional fluctuations in glued parts and reduced scrap rate, thereby increasing product yield, reducing material waste and production costs, resulting in significant economic benefits. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the linkage line structure of the tire rubber component extrusion dimension stability control method in an embodiment of the present invention;

[0023] Figure 2 This is a comparison chart of fixed-length measurement data of the adhesive component before and after improvement during the production process in an embodiment of the present invention.

[0024] The diagram shows the following markings: 1. Extruder; 2. Shrink roller conveyor; 21. First shrink roller conveyor; 22. Second shrink roller conveyor; 23. Third shrink roller conveyor; 24. Fourth shrink roller conveyor; 3. Front measuring section; 4. Uphill conveyor belt section; 5. Cooling and blowing section; 51. First soaking section; 52. Second soaking section; 53. First spraying section; 54. Second spraying section; 55. First blowing section; 6. Downhill conveyor belt section; 7. Downward blowing section; 8. Rear measuring section; 9. Take-up conveyor belt; 10. Floating roller. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0026] Example:

[0027] like Figures 1-2 As shown, the present invention provides a method for controlling the dimensional stability of tire rubber components during extrusion, comprising the following steps:

[0028] S1. After the rubber compound is extruded from the extruder 1, it enters a four-section continuous shrinkage roller conveyor 2 through the receiving section. Each section of the shrinkage roller conveyor 2 is driven by an AC variable frequency motor via a chain. The variable frequency motor can set the shrinkage ratio range. Currently, the shrinkage ratio range of the rubber compound in production is 6-18%. The running speed of the four sections of the shrinkage roller conveyor 2 gradually decreases. The four sections of the shrinkage roller conveyor 2 include a first shrinkage roller conveyor 21, a second shrinkage roller conveyor 22, a third shrinkage roller conveyor 23, and a fourth shrinkage roller conveyor 24. The running speed of the first shrinkage roller conveyor 21 is 33.2 m / min, the running speed of the second shrinkage roller conveyor 22 is 32.2 m / min, the running speed of the third shrinkage roller conveyor 23 is 31.2 m / min, and the running speed of the fourth shrinkage roller conveyor 24 is 30.2 m / min.

[0029] S2. After the rubber component is shrunk by the four sections of shrinking roller conveyor 2, the width and weight of the rubber component are measured and monitored by the front measuring section 3.

[0030] S3. The rubber component, which meets the set width and weight standards, enters the cooling and blowing section 5 via the uphill conveyor belt section 4. The cooling and blowing section consists of five sections, including a first soaking section 51, a second soaking section 52, a first spraying section 53, a second spraying section 54, and a primary blowing section 55. The rubber component is soaked and sprayed for cooling in sequence through the first soaking section 51, the second soaking section 52, the first spraying section 53, the second spraying section 54, and the primary blowing section 55, effectively cooling the rubber component. Under the action of the primary blowing section 55, dry air is blown onto the surface of the tire rubber component to blow away excess moisture and coolant adhering to the surface, ensuring the performance and quality of the rubber component.

[0031] After passing through the first blowing section 55, the adhesive component then passes through the downhill conveyor section 6 and enters the down blowing section 7 and the rear measuring section 8 in sequence. The adhesive component that meets the set range is conveyed to the designated position by the winding conveyor section 9 for cutting and winding.

[0032] Floating rollers 10 are installed between the front measuring section 3 and the uphill conveyor belt section 4, between the uphill conveyor belt section 4 and the first soaking section 51, between the first soaking section 51 and the second soaking section 52, between the second soaking section 52 and the first spraying section 52, between the first blowing section 5 and the downhill conveyor belt section 6, and between the rear measuring section 8 and the winding conveyor belt section 9. The floating rollers 10 are used to control the speed difference of the adhesive component as it passes through the aforementioned front and rear sections.

[0033] Specifically, each of the above sections is equipped with a conveyor belt, and the floating roller 10 is used to adjust the speed difference between the two conveyor belts before and after it. The first spray section 53, the second spray section 54 and the primary water blowing section 55 together constitute a complete conveyor belt. Therefore, the corresponding floating roller 10 is installed on the front side of the first spray section 53 and the rear side of the primary water blowing section 55.

[0034] Furthermore, fixed-length marks are made on different adhesive components, and the shrinkage length of different adhesive components after passing through steps S1 to S3 is manually measured. Based on the shrinkage length, the shrinkage speed ratio of different adhesive components passing through the shrinkage roller 2 is determined.

[0035] Furthermore, the overall shrinkage speed ratio of the shrinkage roller conveyor 2 is 8% to 10%. The shrinkage speed ratio of each of the last three shrinkage roller conveyor sections 2 is the percentage difference between the running speed of the last shrinkage roller conveyor section 2 and that of the previous shrinkage roller conveyor section. In this embodiment, the shrinkage speed ratios of the last three shrinkage roller conveyor sections 2 are 3%:3%:3%, that is, the overall shrinkage speed ratio of the shrinkage roller conveyor 2 is the sum of the shrinkage speed ratios of each of the last three shrinkage roller conveyor sections 2, which is 9%. Specifically, the shrinkage speed ratios are different for different rubber materials, and the shrinkage speed ratios are adjusted at any time based on the results of the fixed-length verification of the above-mentioned rubber components.

[0036] Furthermore, an angular displacement sensor is provided on the side of the floating roller 10. The angular displacement sensor transmits the signal of the detected position change of the floating roller 10 to the main control console. The main control console adjusts the speed of each section before and after the floating roller 10 according to the signal to ensure that the speed of each conveyor belt before and after is synchronized and consistent.

[0037] Furthermore, each section of the shrinkage roller conveyor 2 consists of multiple rollers, the diameter of which gradually decreases from front to back. As the diameter of each set of rollers gradually decreases, the tire rubber component is subjected to gradually increasing extrusion pressure as it passes through the shrinkage roller conveyor 2. This gradually changing extrusion pressure helps the tire rubber component maintain dimensional consistency during the extrusion process, avoiding abrupt dimensional changes or instability.

[0038] Furthermore, if the extruded dimensions of the rubber component exceed the standard tolerances, where the standard tolerances are ±0.3mm for thickness, ±3mm for width, and ±3% for weight, the main control console fine-tunes the screw speed and linear velocity of the extruder, as well as the shrinkage rate ratio. The fine-tuning range for the screw speed is ±1 r / min, the fine-tuning range for the linear velocity is ±3 m / min, and the fine-tuning range for the shrinkage rate ratio is ±0.5%. If the standard tolerances still cannot be met after adjustment, the main control console will automatically record the error and provide feedback to the technical department via the factory's MES (Manufacturing Execution System) for manual intervention by engineers.

[0039] Furthermore, both the front-end and rear-end measurement sections use a continuous weighing scale and a width-measuring camera to measure and monitor the weight and width of the rubber component, respectively. Both the width-measuring camera and the continuous weighing scale can communicate with the main control console PLC to set, store, display, recall, and modify production and process operating parameters. They also automatically adjust the linkage speed to control the width and weight of the pressed product, thereby reducing dimensional fluctuations in the rubber component during production.

[0040] The production plan specifications are selected based on actual production conditions. When switching specifications, the plan and process parameters can be automatically retrieved from the MES with a single click. Based on the MES process information, the locally preset speed ratio is automatically retrieved and sent to the main control console PLC. The main control console presets the shrink roller speed ratio according to different types of rubber. After the molding compound is extruded, it passes through four shrink roller sections in sequence, and then through each section of conveyor belt before being wound up by a winding trolley for later use.

[0041] The various sections of the conveyor belt are connected by floating rollers, which adjust the speed of the front and rear conveyor belts in real time to ensure the dimensional stability of the products during the conveying process.

[0042] Based on the above control method, the length measurement data of the glued parts before and after the improvement during the production process are compared, for example... Figure 2 As shown.

[0043] from Figure 2 As can be seen, the rubber component before improvement had abnormal stretching points. After adjusting the speed difference percentage between the three shrinkage roller sections 2 according to the type of rubber compound using the above method, the ratio was set to 3%:3%:3% (see Table 1 below). The floating rollers 10 of the linkage line were also adjusted to ensure the stability of the rubber component during transport. After improvement, the length measurement of the rubber component during transport became more stable, demonstrating a significant improvement effect.

[0044] Table 1

[0045] contraction segment 1 contraction 2 segments contraction 3 segments contraction 4 segments Shrinkage speed ratio 3％ 3％ 3％ Operating speed (m / min) 33.2 32.2 31.2 30.2

[0046] In the description of this invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] However, the above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A method for controlling the dimensional stability of tire rubber components during extrusion, characterized in that, Includes the following steps: S1. Based on the production plan and historical adjustment records, the process parameters are automatically obtained and sent to the main control console. The main control console adjusts the relevant parameters according to the type of rubber compound. S2. After the rubber compound is extruded from the extruder, it enters a four-section shrink roller conveyor, and the running speed of the four-section shrink roller conveyor gradually decreases. S3. After the rubber component has been shrunk by the four sections of shrink roller conveyor, the width and weight of the rubber component are measured and monitored by the front measuring section. S4. The adhesive component that meets the set range enters the cooling and blowing section through the uphill conveyor belt section, and then enters the downhill conveyor belt section and the rear measuring section in sequence. The rear measuring section performs a second measurement on the cooled and shaped adhesive component and feeds the measurement results back to the main control console to determine whether the extrusion dimension of the adhesive component exceeds the standard tolerance. If the tolerance is exceeded, fine-tuning is performed; if fine-tuning still fails to meet the standard tolerance, the main control console will automatically record the manual intervention parameters after feedback. S5. The adhesive components that meet the set range are cut and wound after being conveyed by the winding conveyor belt segment. Floating rollers are installed between the front measuring section and the uphill conveyor belt section, between the uphill conveyor belt section and the cooling water blowing section, between the cooling water blowing section and the downhill conveyor belt section, and between the rear measuring section and the winding conveyor belt section. The floating rollers are connected to the main control console via angular displacement sensors to control the speed difference of the adhesive component as it passes through the front and rear sections. A fixed-length mark is made on the adhesive component, and the shrinkage length of the adhesive component after passing through S1 to S3 is measured. The shrinkage speed ratio of the shrinkage roller is determined based on the shrinkage length; the shrinkage speed ratio is 8% to 10%. An angular displacement sensor is provided on the side of the floating roller. The angular displacement sensor transmits the signal of the detected change in the position of the floating roller to the main control console. The main control console adjusts the speed of each section before and after the floating roller according to the signal to ensure that the speeds of each section before and after the floating roller are synchronized. After the extrusion dimensions of the rubber component exceed the standard tolerance, the main control console fine-tunes the screw speed and linear speed of the extruder, as well as the shrinkage rate ratio. The fine-tuning range of the screw speed is ±1 r / min, the fine-tuning range of the linear speed is ±3 m / min, and the fine-tuning range of the shrinkage rate ratio is ±0.5%.

2. The method for controlling the dimensional stability of tire rubber components extrusion according to claim 1, characterized in that, Each section of the shrinkage roller conveyor consists of multiple rollers, the diameter of which gradually decreases from front to back.

3. The method for controlling the dimensional stability of tire rubber components extrusion according to claim 1, characterized in that, The standard tolerances are: thickness ±0.3mm, width ±3mm, and weight ±3% for the adhesive component.

4. The method for controlling the dimensional stability of tire rubber components extrusion according to claim 1, characterized in that, Both the front-end and rear-end measurement sections use a continuous scale and a width measuring camera to measure and monitor the weight and width of the rubber component, respectively. The continuous scale and the width measuring camera are both connected to the main control console. The main control console adjusts the weight and width of the pressed-out rubber component based on the signals transmitted by the continuous scale and the measuring camera.

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