Method for controlling extrusion dimensional stability of tire rubber part

Abstract

The invention provides a method for controlling the extrusion size stability of a tire rubber part, which comprises the following steps that: a rubber material is extruded from an extruder and then enters a four-section shrinkage roller way, and the running speed of the four-section shrinkage roller way is gradually reduced; the width and the weight of the rubber part shrunk by the four-section shrinking roller way are measured and monitored by the front-end measuring section; the rubber component meeting the range enters the cooling water blowing section through the uphill conveying belt section, then sequentially enters the lower water blowing section and the rear-end measuring section through the downhill conveying belt section, and is cut and coiled after being conveyed through the coiling conveying belt section; floating rollers are arranged between the front-end measuring section and the upslope conveying belt section, between the upslope conveying belt section and the cooling water blowing section, between the cooling water blowing section and the downslope conveying belt section and between the rear-end measuring section and the coiling conveying belt section and are used for controlling the speed difference of the rubber part passing through the front section and the rear section, so that the size stability of the rubber part is improved; the yield is improved, and material waste and production cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tire production, and in particular to a method for controlling the extruded dimensional stability of a tire rubber component. Background Art

[0002] At present, in the tire production process, the dimensional stability of rubber parts is mainly achieved by manually adjusting the extrusion line speed of rubber parts. Although these methods can ensure the dimensional stability of extruded products to a certain extent, there are still the following problems:

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

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

[0005] Third, the scrap ratio is high: dimensional instability leads to a large amount of scrap, which increases production costs and affects production efficiency. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and provide a method for controlling the extruded dimensional stability of tire rubber components.

[0007] To this end, the present invention provides a method for controlling the extrusion dimensional stability of a tire rubber component, comprising the following steps:

[0008] S1, after the rubber material is extruded from the extruder, it enters a four-stage shrink roller, and the running speed of the four-stage shrink roller gradually decreases;

[0009] S2, the rubber component after shrinking by the four-stage shrinking roller passes through the front-end measuring section to measure and monitor the width and weight of the rubber component;

[0010] S3, the rubber component that meets the set range passes through the uphill conveyor belt section into the cooling water blowing section, and then passes through the downhill conveyor belt section to enter the down water blowing section and the rear end measuring section in sequence. The rubber component that meets the set range is conveyed through the winding conveyor belt section and then cut and wound;

[0011] Among them, floating rollers are installed between the front end 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 end measuring section and the winding conveyor belt section. The floating rollers are used to control the speed difference of the rubber component passing through the front and rear sections.

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

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

[0014] Preferably, an angular displacement sensor is provided on the side of the floating roller, and the angular displacement sensor transmits a signal of the monitored position change of the floating roller to the main control console, and the main control console adjusts the speed of the front and rear sections of the floating roller according to the signal to ensure that the speeds of the front and rear sections are synchronized.

[0015] Preferably, each section of the shrinking roller is composed of a plurality of rollers, and the diameters of the plurality of rollers gradually decrease from front to back.

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

[0017] Preferably, the standard tolerance is the thickness of the adhesive component ±0.3 mm, the width ±3 mm, and the weight ±3%.

[0018] Preferably, the front-end measuring section and the rear-end measuring section both use a continuous scale and a width measuring camera to measure and monitor the weight and width of the adhesive component respectively, and the continuous scale and the width measuring camera are both connected to the main control console signal, and the main control console adjusts the pressed weight and width of the adhesive 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 extruded dimensional stability of a tire rubber component, which has the following beneficial effects.

[0020] ⑴ Improved the stability of the size of the rubber parts: Through the roller diameter ratio and the shrinking speed ratio of the shrinking roller, and the dynamic adjustment of the speed of the front and rear sections by the floating roller, the speed of the front and rear sections is kept consistent. At the same time, under the action of the front and rear measuring sections, the width and weight of the rubber parts can be measured and monitored in time. If the width and weight of the rubber parts exceed the set standard range during the extrusion process, the main control system will adjust the screw speed and line speed of the extruder according to the change logic of the width / weight and the screw speed / line speed after receiving the transmitted signal, so that the width / weight of the rubber parts returns to the qualified range, so as to achieve the purpose of controlling the stability of the extruded size of the rubber parts, improving the consistency of product quality, and improving product quality;

[0021] ⑵ Improved yield rate: Improved the dimensional fluctuation of rubber parts and reduced the proportion of scrap, thereby improving the yield rate of products, reducing material waste and production costs, and having significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the linkage line structure of the tire rubber component extrusion dimensional stability control method in an embodiment of the present invention;

[0023] Figure 2 It is a comparison chart of the fixed length measurement data of the rubber component before and after the improvement in the production process in the embodiment of the present invention.

[0024] Markings in the figure: 1. Extruder; 2. Contraction roller; 21. First contraction roller; 22. Second contraction roller; 23. Third contraction roller; 24. Fourth contraction roller; 3. Front end measuring section; 4. Uphill conveyor belt section; 5. Cooling water blowing section; 51. First immersion section; 52. Second immersion section; 53. First spray section; 54. Second spray section; 55. First water blowing section; 6. Downhill conveyor belt section; 7. Downward water blowing section; 8. Rear end measuring section; 9. Winding conveyor belt; 10. Floating roller. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0026] Example:

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

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

[0029] S2, the rubber component after shrinking by the four-stage shrinking roller 2 passes through the front-end measuring section 3 to measure and monitor the width and weight of the rubber component;

[0030] S3. The rubber component that meets the set width and weight standard range passes through the uphill conveyor belt section 4 and enters the cooling water blowing section 5. The cooling water 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 water blowing section 55. The rubber component is immersed and sprayed and cooled in the first soaking section 51, the second soaking section 52, the first spraying section 53, the second spraying section 54 and the primary water blowing section 55 in turn, so as to effectively cool the rubber component. Under the action of the primary water blowing section 55, dry air is blown to the surface of the tire rubber component to blow away excess water and coolant attached to the surface, so as to ensure the performance and quality of the rubber component.

[0031] The rubber parts passing through the first water blowing section 55 then pass through the downhill conveyor belt section 6 and enter the lower water blowing section 7 and the rear end measuring section 8 in sequence. The rubber parts meeting the set range are conveyed to the designated position through the winding conveyor belt section 9 for cutting and winding.

[0032] Among them, floating rollers 10 are installed between the front end measuring section 3 and the uphill conveyor belt section 4, between the uphill conveyor belt section 4 and the first immersion section 51, between the first immersion section 51 and the second immersion section 52, between the second immersion section 52 and the first spraying section 52, between the primary water blowing section 5 and the downhill conveyor belt section 6, and between the rear end measuring section 8 and the winding conveyor belt section 9. The floating rollers 10 are used to control the speed difference of the rubber component through the above-mentioned front and rear sections.

[0033] Specifically, each of the above sections is installed with a conveyor belt, and the floating roller 10 is used to adjust the speed difference between the two transmission belts in front and behind 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 contraction lengths of different adhesive components after step S1 to step S3 are manually measured, and the contraction speed ratios of different adhesive components passing through the contraction roller 2 are determined according to the contraction lengths.

[0035] Furthermore, the overall shrinkage speed ratio of the shrinkage roller 2 is 8% to 10%, and the shrinkage speed ratio of each of the last three sections of the shrinkage roller 2 is the percentage of the difference in running speed between the last section of the shrinkage roller 2 and the previous section of the shrinkage roller 2. In this embodiment, the shrinkage speed ratios of the last three sections of the shrinkage roller 2 are 3%:3%:3% respectively, that is, the overall shrinkage speed ratio of the shrinkage roller 2 is the sum of the shrinkage speed ratios of each of the last three sections of the shrinkage roller 2, which is 9%. Specifically, different rubber materials have different shrinkage speed ratios, and the shrinkage speed ratio is adjusted at any time according to 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, and the angular displacement sensor transmits a signal of the position change of the floating roller 10 to the main control console. The main control console adjusts the speed of the front and rear sections of the floating roller 10 according to the signal to ensure that the speeds of the front and rear conveyor belts are synchronized and kept consistent.

[0037] Furthermore, each section of the shrinking roller 2 is composed of a plurality of rollers, and the diameters of the plurality of rollers gradually decrease from front to back. As the diameter of each group of rollers gradually decreases, the tire rubber component will be subjected to a gradually increasing extrusion force when passing through the shrinking roller 2. This gradually changing extrusion force helps the tire rubber component maintain dimensional consistency during the extrusion process, and avoids dimensional mutation or instability.

[0038] Furthermore, when the extrusion size of the rubber part exceeds the standard tolerance, which is ±0.3mm for thickness, ±3mm for width, and ±3% for weight, the main control console fine-tunes the screw speed and line speed of the extruder and the contraction speed ratio, with the screw speed fine-tuning range being ±1r / min, the line speed fine-tuning range being ±3m / min, and the contraction speed ratio fine-tuning range being ±0.5%. If the standard tolerance is still not met after adjustment, the main control console will automatically record and feed back to the technical department through the factory MES (manufacturing execution system), and the engineer will manually intervene to solve the problem.

[0039] Furthermore, the front-end measuring section and the rear-end measuring section both use a continuous scale and a width measuring camera to measure and monitor the weight and width of the rubber component. The width measuring camera and the continuous scale can communicate with the main control console PLC to achieve the functions of setting, storing, displaying, calling, and modifying production and process operation parameters, and automatically feedback and adjust the linkage line speed to control the width and weight of the extruded product, so as to reduce the size fluctuation of the rubber component during the production process.

[0040] Select the production plan specifications according to the actual production situation. When switching specifications, the plan and process parameters can be automatically obtained from MES with one click. According to the MES process information, the local preset speed ratio is automatically retrieved and sent to the main control console PLC. The main control console presets the speed ratio of the shrink roller according to the type of rubber. After the rubber is extruded, it passes through four sections of shrink rollers in sequence, and after passing through each section of the conveyor belt, it is coiled up by the coiling trolley for standby use.

[0041] The above-mentioned conveyor belt sections are connected by floating rollers and the speed of the front and rear conveyor belts is adjusted in real time to ensure the dimensional stability of the products during the conveying process.

[0042] According to the above control method, the fixed length measurement data of the rubber parts before and after improvement in the production process is compared. Figure 2 shown.

[0043] from Figure 2 It can be seen that there are abnormal stretching points in the rubber parts before improvement. The above method is used to adjust the speed difference between the three sections of the shrink rollers 2 according to the type of rubber material to 3%:3%:3% (see Table 1 below), and the floating rollers 10 of the linkage line are adjusted to keep the rubber parts stable during the transmission process. After improvement, the fixed length measurement of the rubber parts during transportation tends to be stable, and the improvement effect is obvious.

[0044] Table 1

[0045] Contraction 1 stage Contraction 2 stages Contraction 3 stages Contraction 4 stages Shrinkage speed ratio 3％ 3％ 3％ Running speed m / min 33.2 32.2 31.2 30.2

[0046] In the description of the present invention, it is necessary to understand that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A method for controlling the extrusion dimensional stability of a tire rubber component, characterized in that: The steps include: S1, after the rubber material is extruded from the extruder, it enters a four-stage shrink roller, and the running speed of the four-stage shrink roller gradually decreases; S2, the rubber component after shrinking by the four-stage shrinking roller passes through the front-end measuring section to measure and monitor the width and weight of the rubber component; S3, the rubber component that meets the set range passes through the uphill conveyor belt section into the cooling water blowing section, and then passes through the downhill conveyor belt section to enter the down water blowing section and the rear end measuring section in sequence. The rubber component that meets the set range is conveyed through the winding conveyor belt section and then cut and wound; Among them, floating rollers are installed between the front end 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 end measuring section and the winding conveyor belt section. The floating rollers are used to control the speed difference of the rubber component passing through the front and rear sections.

2. A method for controlling the extrusion dimensional stability of a tire rubber component according to claim 1, characterized in that: A fixed-length mark is made on the adhesive component, and the contraction length of the adhesive component after passing through S1 to S3 is measured, and the contraction speed ratio of the contraction roller is determined according to the contraction length.

3. A method for controlling the extrusion dimensional stability of a tire rubber component according to claim 2, characterized in that: The shrinkage speed ratio is 8% to 10%.

4. A method for controlling the extrusion dimensional stability of a tire rubber component according to claim 3, characterized in that: An angular displacement sensor is provided on the side of the floating roller, and the angular displacement sensor transmits a signal of the monitored position change of the floating roller to the main control console. The main control console adjusts the speed of the front and rear sections of the floating roller according to the signal to ensure the speed synchronization of the front and rear sections.

5. The method for controlling the extrusion dimensional stability of a tire rubber component according to claim 1, characterized in that: Each section of the shrinking roller is composed of a plurality of rollers, and the diameters of the plurality of rollers gradually decrease from front to back.

6. A method for controlling the extrusion dimensional stability of a tire rubber component according to claim 4, characterized in that: After the extrusion size of the rubber component exceeds the standard tolerance, the main control console fine-tunes the screw speed and line speed of the extruder and the contraction speed ratio. The fine-tuning range of the screw speed is ±1r / min, the fine-tuning range of the line speed is ±3m / min, and the fine-tuning range of the contraction speed ratio is ±0.5%.

7. A method for controlling the extrusion dimensional stability of a tire rubber component according to claim 6, characterized in that: The standard tolerances are the thickness of the adhesive component ±0.3 mm, the width ±3 mm, and the weight ±3%.

8. A method for controlling the extrusion dimensional stability of a tire rubber component according to claim 4, characterized in that: The front-end measuring section and the rear-end measuring section both use a continuous scale and a width measuring camera to measure and monitor the weight and width of the adhesive component respectively. The continuous scale and the width measuring camera are both connected to the main control console signal. The main control console adjusts the pressed weight and width of the adhesive component according to the signals transmitted by the continuous scale and the measuring camera.

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