A process for online non-stop switching and venting of extruded rubber types

Abstract

This invention belongs to the field of tire manufacturing technology, specifically relating to an online non-stop switching and venting process for extruded rubber types. This invention calculates the unit discharge volume of the extruder and the total number of revolutions required to complete the venting process. It combines this with the real-time rotational speed calculation time of the crown rubber for each specification in the manufacturing execution system's speed formula table, and utilizes PLC calculation functions for time conversion and countdown, achieving non-stop switching of rubber types. This successfully avoids the cost losses caused by equipment downtime for rubber type venting and improves the quality monitoring method for rubber material switching. After applying this process, the equipment's uptime efficiency increases to over 95%, effectively solving the time cost losses caused by equipment downtime for venting rubber material during extrusion process rubber type switching.

Description

Technical Field

[0001] This invention belongs to the field of tire manufacturing technology, specifically relating to an online non-stop switching and venting process for extruded rubber types. Background Technology

[0002] Tire tread compound possesses high wear resistance, fatigue resistance, and good aging resistance, along with high tensile strength, elasticity, and toughness, as well as low heat generation during driving. Due to different usage scenarios or regions, the compound formulation design varies significantly. Therefore, the extrusion process uses different compounds for the tire crown component. To ensure the purity of the compound and meet performance requirements, the extrusion process requires evacuation of the extruder when switching between different compound types to prevent compound mixing. To avoid degrading crown rubber performance, each compound type switch requires 10-20 minutes of evacuation time from the extruder, depending on the equipment model or production process. Furthermore, each tire manufacturer has its own unique customers or markets, resulting in different crown rubber formulation designs. Currently, tire companies with a daily production capacity exceeding 30,000 tires typically use more than six types of crown rubber compounds. Assuming a three-shift production schedule, the cumulative evacuation time for compound switching is [MIX]. The 180-minute time limit significantly reduced production efficiency, with the equipment's time utilization rate falling below 83%. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an online non-stop switching and venting process for extruded rubber types. To address the time cost losses caused by equipment downtime for venting rubber during rubber type switching in extrusion processes, this invention standardizes rubber switching by calculating the unit discharge volume of the extruder and, leveraging the unidirectional pushing principle of the extruder, calculates the process parameters of the rubber from the feeding end to the extrusion end. Furthermore, it utilizes MES and PLC programs to enable non-stop rubber type switching, successfully avoiding the cost losses caused by equipment downtime for rubber type venting and improving the quality monitoring method for rubber switching. After applying this process, the equipment's uptime utilization rate increases to over 95%.

[0004] To achieve the above technical objectives, the technical solution adopted in the embodiments of the present invention is as follows:

[0005] This invention provides a process for online non-stop glue type switching and venting, comprising the following steps:

[0006] (1) Measure the gap between the thread wall and the inner bushing of the extruder used for crown glue. Under the empty state, measure the gap between the thread and the inner bushing in four directions: up, down, left, and right to ensure that the gap meets the requirements.

[0007] (2) After the extruder head is closed and locked, the die is installed into the die box and locked. Then, the glue is added and discharged for 5-10 minutes. After the glue discharge is stable and there are no bubbles, the glue discharge amount is calculated.

[0008] (3) After the discharge volume data is completed, cut the rubber material from both the feed port and the discharge port, stop the machine, empty the barrel, flow channel and pre-drilled mold of the rubber material, and weigh and record the weight.

[0009] (4) Calculate the amount of glue discharged per revolution based on the above data, and calculate the total number of revolutions required to complete the glue discharge and emptying action;

[0010] (5) Combine the real-time rotation speed of the crown adhesive in the rotation speed formula table of the manufacturing execution system to calculate the time, and use the PLC calculation function to perform time conversion countdown. When the countdown ends, the PLC will issue an alarm sound to prompt that the equipment stops working. At this time, the adhesive type switching has been completed.

[0011] (6) According to the production plan of the next specification, start the mouth shape switching and smoothly carry out the production operation of the new specification and new rubber type.

[0012] Furthermore, in step (1), when the average measured value of the gap is ≤0.5mm, the mixing of the rubber compound caused by the backflow of the rubber compound can be ignored, which meets the requirements;

[0013] When the average measured clearance is greater than 0.5 mm, it indicates that the wear between the screw and the bushing exceeds the process control range and the maintenance period is required.

[0014] Furthermore, in step (2), during the rubber extrusion quantity calculation test, the extruder was tested at three speeds: the minimum, the median, and the maximum speed required by the equipment protocol. Multiple sets of data were continuously sampled and tested within a fixed time period at the three speeds, and the weights were weighed and recorded.

[0015] Sampling must meet the following conditions: the weight of a single sample taken within a fixed time period is 3-6 kg.

[0016] Furthermore, the sampling in step (2) includes the following steps:

[0017] a. After the extruder stabilizes at 5 r / min for one minute, start timing in 30-second intervals, collect the amount of glue produced during each interval, and weigh it on an electronic scale. Collect 6 sets of data continuously.

[0018] b. After the extruder stabilizes at 15 r / min for 30 seconds, start timing in 10-second intervals, collect the amount of glue produced during each interval, and weigh it on an electronic scale. Collect 6 sets of data continuously.

[0019] c. After the extruder stabilizes at 25 r / min for 30 seconds, start timing in 5-second intervals, collect the amount of glue produced during each interval, and weigh it on an electronic scale. Collect 6 sets of data continuously.

[0020] Furthermore, in step (4), the amount of adhesive dispensed per revolution is G 转 The calculation formula is as follows:

[0021] G 转 = G 均 ÷(V×t÷60)

[0022] Among them, G 转 - Amount of adhesive dispensed per revolution, kg / r;

[0023] G 均 - Average weight of extruded adhesive at the test rotation speed, kg;

[0024] V - Extruder speed, r / min;

[0025] t - timing time, s.

[0026] Furthermore, in step (4), the formula for calculating the total number of revolutions R for glue discharge is as follows:

[0027] R = (G1 + G2 + G3) ÷ G0,

[0028] Where R is the total number of revolutions for dispensing glue, r; G1 is the weight of glue in the barrel, kg; G2 is the weight of glue in the runner, kg; G3 is the weight of glue in the pre-form, kg; and G0 is the weight per revolution, kg / r.

[0029] Furthermore, in step (5), the following formula is used to calculate the time:

[0030] T=R / v,

[0031] Where T is time (s), R is the total number of revolutions for dispensing glue (r), and v is the real-time rotation speed (r / min).

[0032] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0033] (1) The application of the process of switching and emptying rubber types online without stopping the machine has greatly changed the quality problems such as tread block falling off, tread groove bottom cracking, and tire wear-ineffectiveness caused by the mixing of crown rubber types, which has always been a concern of the quality department or due to inadequate on-site supervision; and has greatly improved production efficiency in actual production application, with the equipment's time utilization rate increased by more than 12%.

[0034] (2) The process of switching and emptying rubber types online without stopping the machine is simple to use and is not limited by specific time or speed. It performs autonomous formula calculation based on real-time formula speed, does not affect the changes in specifications and dimensions of online reproduction, and automatically completes the emptying and alarm prompt (stop) rubber type switching process. Attached Figure Description

[0035] Figure 1 This is an operation flowchart of the online non-stop switching and venting process for the extruded rubber type in an embodiment of the present invention.

[0036] Figure 2 This is a flowchart illustrating the online non-stop switching and venting process for the extruded rubber type in this embodiment of the invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] Example 1

[0039] When switching between RW and RX tire compounds, a Terester four-component extrusion equipment is used to implement a non-stop venting process for switching extruded compounds. Figure 1 and 2 As shown, it includes the following steps:

[0040] (1) The gap between the thread wall and the inner bushing of the extruder used by the crown glue was measured. Under the empty state, the gap between the thread and the inner bushing was measured in four directions: up, down, left and right. The average value was 0.2625mm, which met the requirements. See Table 1 for details.

[0041] Table 1 Measurement results of the clearance between the threaded wall and the inner bushing

[0042] .

[0043] Note: Measurement method in Table 3: Facing the screw, use a feeler gauge to measure in four directions in a cross pattern (up, down, left, right).

[0044] (2) After the extruder head is closed and locked, the die is installed into the die box and locked. RW rubber material is added and discharged for 5-10 minutes. After the rubber material discharge is stable and no air bubbles are heard, the rubber material discharge amount is calculated.

[0045] (3) After the extruder stabilizes at the minimum speed of 5r / min for 1min, start timing in 30s intervals, collect the amount of glue produced during the interval, and weigh it on an electronic scale. Collect 6 sets of data continuously, as shown in Table 2.

[0046] (4) After the extruder stabilizes at the median speed of 15 r / min for 30 seconds, start timing in 10-second intervals, collect the amount of glue produced during the interval, and weigh it on an electronic scale. Collect 6 sets of data continuously, as shown in Table 2.

[0047] (5) After the extruder stabilizes at the maximum speed of 25r / min for 30 seconds, start timing in 5-second intervals, collect the amount of glue produced during the interval, and weigh it on an electronic scale. Collect 6 sets of data continuously, as shown in Table 2.

[0048] Table 2 Calculation Results of RW Rubber Compound Extrusion Amount

[0049] .

[0050] Table 2 shows the amount of adhesive dispensed per revolution (G). 转 The calculation formula is as follows:

[0051] G 转 = G 均 ÷(V×t÷60)

[0052] Among them, G 转 - Amount of glue dispensed per revolution, kg / r;

[0053] G 均 - Average weight of extruded adhesive at the test rotation speed, kg;

[0054] V - Extruder speed, r / min;

[0055] t - timing time, s.

[0056] According to the data in Table 2, when the rotation speed is 5 r / min, the amount of adhesive discharged per revolution is G. 转 = G 均 ÷(V×t÷60)=4.07÷(5×30÷60)=1.627kg / r;

[0057] When the rotation speed is 15 r / min, the amount of glue dispensed per revolution is G 转 = G 均 ÷(V×t÷60)=3.99÷(15×10÷60)=1.595kg / r;

[0058] At a rotation speed of 25 r / min, the amount of adhesive dispensed per revolution is G 转 = G 均 ÷(V×t÷60)=3.32÷(25×5÷60)=1.594kg / r.

[0059] (6) After the above data collection is completed, cut the rubber material at the feeding port. When the tail end of the rubber material moves to the bottom of the feeding port, stop the machine and clean all the rubber material outside the feeding port.

[0060] (7) At this time, restart the machine and open the machine head. Discharge all the rubber material in the die, flow channel and barrel, weigh and record it, as shown in Table 3;

[0061] (8) Calculate the amount of glue dispensed per revolution G based on the data in Table 1. 转 Then, the total amount of glue in the entire barrel, flow channel and pre-form is summed up, and the total number of revolutions required to complete the glue discharge and emptying action is calculated, as shown in Table 3.

[0062] Table 3. Weighing data of total adhesive content in barrel and runner.

[0063] .

[0064] The formula for calculating the total number of revolutions R for glue discharge is as follows:

[0065] R = (G1 + G2 + G3) ÷ G0,

[0066] Where R is the total number of revolutions for dispensing glue, r; G1 is the weight of glue in the barrel, kg; G2 is the weight of glue in the runner, kg; G3 is the weight of glue in the pre-form, kg; and G0 is the weight per revolution, kg / r.

[0067] Based on the data in Tables 2 and 3, the total number of revolutions for rubber discharge R = (G1 + G2 + G3) ÷ G0 = (70.005kg + 17kg + 0.5kg) ÷ 1.605kg / r ≈ 55r.

[0068] (9) Combine the real-time rotation speed of the crown glue in the MES during production, and calculate the time (s) according to the formula: total rotation (r) ÷ real-time rotation speed (r / min) ÷ 60. Then use the PLC calculation function to calculate the time countdown. When the countdown ends, the PLC will issue an alarm sound and the equipment will stop working. At this time, the glue type switching has been completed.

[0069] (10) According to the production plan of the next specification, start the die switching and smoothly carry out the production of RX rubber.

[0070] After the equipment alarms and shuts down, samples are taken at 1m intervals before shutdown and after startup. One sample of the crown rubber is taken at 3m, 2m, 1m, shutdown, -1m, -2m, and -3m (with the shutdown period as zero point, the length of the rubber material ejected before shutdown is recorded as positive, and the length of the rubber material ejected when restarting is recorded as negative). Rapid rheological data is checked (using a Noga MFR 100 rotorless rheometer), specific gravity is checked (MH-300A), and hardness is checked (using a Shore hardness tester LX-A). These data are used to verify the accuracy of the mixing and non-mixing positions at the junction of the two rubber materials. The rheological, specific gravity, and hardness parameters of the RW tire crown are shown in Table 4, and the relevant parameters of the RX tire crown are shown in Table 5.

[0071] Table 4. Relevant parameters of RW compound at different locations

[0072] .

[0073] Table 5. Relevant parameters of RX compound at different locations.

[0074] .

[0075] Note: The data in Tables 4 and 5 are explained as follows:

[0076] ML unit: dN·m, representing minimum torque, indicating the initial flowability of the rubber compound, and reflecting the viscosity characteristics of the uncured rubber compound.

[0077] MH unit: dN·m represents the maximum torque, characterizing the highest torque reached by the rubber compound during vulcanization, reflecting the maximum crosslinking density or rigidity of the vulcanized rubber;

[0078] The units for TC10, TC30, TC50, TC90, and TS1 are all seconds (s). TC10 represents the initial vulcanization time, where the torque reaches ML+10%, characterizing the initial stage of the vulcanization reaction. TC30 and TC50 correspond to 30% and 50% vulcanization degrees, respectively, used to evaluate the vulcanization progress. TC90 represents the time required for the torque to reach ML+90%, i.e., the time required for the rubber compound to complete 90% crosslinking reaction, and is an important parameter for determining optimal vulcanization conditions. TS1 represents the scorch time in the rubber compound, i.e., the time required from the start of the experiment until the torque on the vulcanization curve increases by 0.1 N·m. This parameter is mainly used to evaluate the processing safety of the rubber compound; a shorter value indicates a higher likelihood of scorch (i.e., premature vulcanization). By extending the TS1 value, the amount of accelerator can be optimized or the vulcanization system adjusted to balance processing efficiency and safety.

[0079] The unit for specific gravity is g / cm³. 3 Specific gravity reflects the density or weight of the rubber compound;

[0080] The unit of hardness is HA, which reflects the rubber compound's resistance to indentation. The higher the value, the harder the rubber compound, reflecting the performance requirements of different rubber compounds.

[0081] As shown in Tables 4 and 5, the measured data at each 1m sample location showed significant differences in ML / MH and specific gravity values. The 1m sample data differed greatly from the normal RX or RW sample data, indicating that the rubber compound at this location was a mixed-grade compound. Comparative analysis of the data from the ±3m sampling locations showed that the +3m data matched the normal RW sample data, and the -3m data matched the normal RX sample data. Therefore, the rubber compound at this location was consistent with the normal rubber compound data.

[0082] Example 2

[0083] When switching between RA and XB rubber compounds in the tire crown, a non-stop venting process is implemented using a Terester four-compound extrusion equipment, including the following steps:

[0084] The rubber compound added in step (2) is the RA rubber compound for the tire crown, and the rubber compound added in step (10) is the XB rubber compound for the tire crown. The remaining steps and related parameters are the same as in Example 1.

[0085] The test results of the rubber extrusion amount calculation test in steps (2)-(5) are shown in Table 6.

[0086] Table 6 Calculation Results of RA Compound Extrusion Amount

[0087] .

[0088] Table 6 shows the amount of adhesive dispensed per revolution (G). 圈 The calculation formula is as follows:

[0089] G 圈 = G 均 ÷(V×t÷60)

[0090] Among them, G 圈 - Weight of glue dispensed per revolution of the screw, kg / r;

[0091] G 均 - Average weight of extruded adhesive at the test rotation speed, kg;

[0092] V - Extruder speed, r / min;

[0093] t - timing time, s.

[0094] According to the data in Table 6, when the rotation speed is 5 r / min, the amount of adhesive discharged per revolution is G. 圈 = G 均 ÷(V×t÷60)=4.15÷(5×30÷60)=1.660kg / r;

[0095] When the rotation speed is 15 r / min, the amount of glue dispensed per revolution is G 圈 = G 均 ÷(V×t÷60)=4.11÷(15×10÷60)=1.644kg / r;

[0096] At a rotation speed of 25 r / min, the amount of adhesive dispensed per revolution is G 圈 = G 均 ÷(V×t÷60)=3.42÷(25×5÷60)=1.594kg / r.

[0097] The total number of revolutions required to complete the glue removal and air removal action in step (8) is shown in Table 7.

[0098] Table 7 Weighing data of total adhesive volume in barrel and runner.

[0099] .

[0100] The formula for calculating the total number of revolutions R for glue discharge is as follows:

[0101] R = (G1 + G2 + G3) ÷ G0,

[0102] Where R is the total number of revolutions for dispensing glue, r; G1 is the weight of glue in the barrel, kg; G2 is the weight of glue in the runner, kg; G3 is the weight of glue in the pre-form, kg; and G0 is the weight per revolution, kg / r.

[0103] According to the data in Tables 6 and 7, the total number of revolutions for rubber discharge R = (G1 + G2 + G3) ÷ G0 = (71.815kg + 17.47kg + 0.6kg) ÷ 1.648kg / r ≈ 55r.

[0104] After the equipment alarms and shuts down, samples are taken at 1m intervals before shutdown and after startup. One sample of the crown rubber is taken at 3m, 2m, 1m, shutdown, -1m, -2m, and -3m (with the shutdown period as zero point, the length of the rubber material discharged before shutdown is recorded as positive, and the length of the rubber material discharged when restarting is recorded as negative). Rapid rheological data is checked (using a Noga MFR 100 rotorless rheometer), specific gravity is checked (MH-300A), and hardness is checked (using a Shore hardness tester LX-A). These data are used to verify the accuracy of the mixing and non-mixing positions at the junction of the two rubber materials. The relevant parameters of the rubber material rheology, specific gravity, hardness, and crown rubber RA are shown in Table 8, and the relevant parameters of the crown rubber XB are shown in Table 9.

[0105] Table 8. Relevant parameters of RA compound at different locations.

[0106] .

[0107] Table 9. Relevant parameters of XB rubber compound at different locations.

[0108] .

[0109] As can be seen from the data in Tables 8 and 9, the test data measured at each 1m sampling location showed significant differences in ML / MH, specific gravity, and hardness values. The data at the ±1m sampling location showed significant differences compared to the normal sample data for RA or XB. Therefore, it was determined that the rubber compound at this location was a mixed-grade compound. Comparative analysis of the data at the ±3m sampling locations showed that the data at the +3m location matched the normal sample RA, and the data at the -3m location matched the normal sample XB. Therefore, it was determined that the data for this rubber compound was consistent with the normal rubber compound.

[0110] Example 3

[0111] When switching between T557 and T309 tire tread compounds, a non-stop venting process is implemented using a Terester four-compound extrusion equipment to switch extruded rubber types, including the following steps:

[0112] The rubber compound added in step (2) is the tread T557 rubber compound, and the rubber compound added in step (10) is the tread T309 rubber compound. The remaining steps and related parameters are the same as in implementation 1.

[0113] The test results of the rubber extrusion amount calculation test in steps (2)-(5) are shown in Table 10.

[0114] Table 10 Calculation Results of T557 Rubber Compound Extrusion Amount

[0115] .

[0116] Table 10 shows the amount of glue dispensed per revolution (G). 圈 The calculation formula is as follows:

[0117] G 圈 = G 均 ÷(V×t÷60)

[0118] Among them, G 圈 - Weight of glue dispensed per revolution of the screw, kg / r;

[0119] G 均 - Average weight of extruded adhesive at the test rotation speed, kg;

[0120] V - Extruder speed, r / min;

[0121] t - timing time, s.

[0122] According to the data in Table 6, when the rotation speed is 5 r / min, the amount of adhesive discharged per revolution is G. 圈 = G 均÷(V×t÷60)=4.20÷(5×30÷60)=1.680kg / r;

[0123] When the rotation speed is 15 r / min, the amount of glue dispensed per revolution is G 圈 = G 均 ÷(V×t÷60)=4.14÷(15×10÷60)=1.656kg / r;

[0124] At a rotation speed of 25 r / min, the amount of adhesive dispensed per revolution is G 圈 = G 均 ÷(V×t÷60)=3.38÷(25×5÷60)=1.622kg / r.

[0125] The total number of revolutions required to complete the glue removal and air removal action in step (8) is shown in Table 11.

[0126] Table 11 Weighing data of total adhesive volume in barrel and runner.

[0127] .

[0128] The formula for calculating the total number of revolutions R for glue discharge is as follows:

[0129] R = (G1 + G2 + G3) ÷ G0,

[0130] Where R is the total number of revolutions for dispensing glue, r; G1 is the weight of glue in the barrel, kg; G2 is the weight of glue in the runner, kg; G3 is the weight of glue in the pre-form, kg; and G0 is the weight per revolution, kg / r.

[0131] According to the data in Tables 10 and 11, the total number of revolutions for rubber discharge R = (G1 + G2 + G3) ÷ G0 = (72kg + 17.82kg + 0.66kg) ÷ 1.653kg / r ≈ 55r.

[0132] After the equipment alarms and shuts down, samples are taken at 1m intervals before shutdown and after startup. One sample of the crown rubber is taken at 3m, 2m, 1m, shutdown, -1m, -2m, and -3m (with the shutdown period as zero point, the length of the rubber material ejected before shutdown is recorded as positive, and the length of the rubber material ejected when restarting is recorded as negative). The samples are then subjected to rapid rheological data checks (Norway MFR 100 rotorless rheometer), specific gravity checks (MH-300A), and hardness checks (Shore hardness tester LX-A). These data are used to verify the accuracy of the mixing and non-mixing positions at the junction of the two rubber materials. The rheology, specific gravity, and hardness of the T557 and T309 crown rubber materials are shown in Tables 12 and 13.

[0133] Table 12 Relevant parameters of T557 rubber compound at different locations

[0134] .

[0135] Table 13 Relevant parameters of T309 rubber compound at different locations

[0136] .

[0137] As can be seen from the data in Tables 12 and 13, the test data measured at each 1m sampling location showed significant differences in ML / MH, specific gravity, and hardness values. The data at the ±1m sampling location showed significant differences compared to the normal sample data for either T557 or T309 rubber compounds. Therefore, it was determined that the rubber compound at this location was a mixed-grade compound. Comparative analysis of the data at the ±3m sampling locations showed that the data at the +3m location matched the normal T557 rubber compound data, and the data at the -3m location matched the normal T309 rubber compound data. Therefore, it was determined that the data for this rubber compound was consistent with the normal rubber compound data.

[0138] Experimental verification conclusion: Through the non-stop venting and rubber type switching verification of the above three groups of different crown rubber formulations, and the sampling data analysis of each section of rubber, the data difference between sulfur change, specific gravity and hardness was used to determine that the rubber data at the ±1m sampling section was the section where the two rubbers were connected and mixed. The data at the ±2m section was consistent with the normal data and met the usage indicators. The data at the ±3m section was consistent with the normal sample data. Therefore, it was determined that the rubber type switching venting process met the venting requirements and the verification was successful.

[0139] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A process for online non-stop glue type switching and venting, characterized in that, Includes the following steps: (1) Measure the gap between the thread wall and the inner bushing of the extruder used for crown glue. Under the empty state, measure the gap between the thread and the inner bushing in four directions: up, down, left, and right to ensure that the gap meets the requirements. (2) After the extruder head is closed and locked, the die is installed into the die box and locked. Then, the glue is added and discharged for 5-10 minutes. After the glue discharge is stable and there are no bubbles, the glue discharge amount is calculated. (3) After the discharge volume data is completed, cut the rubber material from both the feed port and the discharge port, stop the machine, empty the barrel, flow channel and pre-drilled mold of the rubber material, and weigh and record the weight. (4) Calculate the amount of glue discharged per revolution based on the above data, and calculate the total number of revolutions required to complete the glue discharge and emptying action; (5) Combine the real-time rotation speed of the crown adhesive in the rotation speed formula table of the manufacturing execution system to calculate the time, and use the PLC calculation function to perform time conversion countdown. When the countdown ends, the PLC will issue an alarm sound to prompt that the equipment stops working. At this time, the adhesive type switching has been completed. (6) According to the production plan of the next specification, start the mouth shape switching and smoothly carry out the production operation of the new specification and new rubber type.

2. The process for online non-stop glue type switching and venting according to claim 1, characterized in that, In step (1), when the average value of the gap measurement is ≤0.5mm, the mixing of the rubber compound caused by the backflow of the rubber compound can be ignored, which meets the requirements; When the average measured clearance is greater than 0.5 mm, it indicates that the wear between the screw and the bushing exceeds the process control range and the maintenance period is required.

3. The process for online non-stop glue type switching and venting according to claim 1, characterized in that, In step (2), during the rubber extrusion test, the extruder was tested at the minimum, median and maximum speeds required by the equipment protocol. Multiple sets of data were continuously sampled and tested at fixed time intervals at the three speeds, and the weights were recorded. Sampling must meet the following conditions: the weight of a single sample taken within a fixed time period is 3-6 kg.

4. The process for online non-stop glue type switching and venting according to claim 3, characterized in that, The sampling process in step (2) includes the following steps: a. After the extruder stabilizes at 5 r / min for one minute, start timing in 30-second intervals, collect the amount of glue produced during each interval, and weigh it on an electronic scale. Collect 6 sets of data continuously. b. After the extruder stabilizes at 15 r / min for 30 seconds, start timing in 10-second intervals, collect the amount of glue produced during each interval, and weigh it on an electronic scale. Collect 6 sets of data continuously. c. After the extruder stabilizes at 25 r / min for 30 seconds, start timing in 5-second intervals, collect the amount of glue produced during each interval, and weigh it on an electronic scale. Collect 6 sets of data continuously.

5. The process for online non-stop glue type switching and venting according to claim 1, characterized in that, In step (4), the amount of glue dispensed per revolution is G 转 The calculation formula is as follows: G 转 = G 均 ÷(V×t÷60), Among them, G 转 - Amount of adhesive dispensed per revolution, kg / r; G 均 - Average weight of extruded adhesive at the test rotation speed, kg; V - Extruder speed, r / min; t - timing time, s.

6. The process for online non-stop glue type switching and venting according to claim 1, characterized in that, In step (4), the formula for calculating the total number of revolutions R for glue discharge is as follows: R = (G1 + G2 + G3) ÷ G0, Where R is the total number of revolutions for dispensing glue, r; G1 is the weight of glue in the barrel, kg; G2 is the weight of glue in the runner, kg; G3 is the weight of glue in the pre-form, kg; and G0 is the weight per revolution, kg / r.

7. The process for online non-stop glue type switching and venting according to claim 1, characterized in that, In step (5), the following formula is used to calculate the time: T=R / v, Where T is time (s), R is the total number of revolutions for dispensing glue (r), and v is the real-time rotation speed (r / min).

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