D20-PS 隔离输入通道模块

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型号：D20-PS
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D20-PS 隔离输入通道模块

主机联动生产线的主机部分为XJF-D150×120销钉机筒冷喂料双复合挤出机机组,主要由两台销钉机筒冷喂料挤出机(包括φ150×16D挤出机和φ120×14D挤出机)、150/120二复合液压机头、液压动力系统、温控系统、两台供料机(包括φ150挤出机供料机和φ120挤出机供料机)、钢架平台、整体底座、电气控制系统等组成。液压机头流道尺寸(大宽度×厚度):480×20mm 2.2辅线本联动装置主要由接取输送装置、冷却辊道及测宽装置、上坡运输带I、胎侧贴过渡胶片装置、上坡运输带Ⅱ、喷淋冷却装置、下坡运输带、定长裁断装置、二次吹风及快速分离辊道、单条终检秤、人工拾取辊道装置、胎侧过桥运输带、卷取运输带、四工位卷取装置及生产线电气控制系统等组成,与XJF-D150×120两复合销钉机筒冷喂料挤出机组配套使用,主要用于子午线轮胎的胎侧胶复合挤出成双条(或单条)以及其后的接取、冷却、裁断或卷取等。 3 二复合挤出机组二复合挤出机组是整条联动线的核心,其性能的好坏直接关系到制品的质量,影响到制品的挤出温度以及断面的尺寸。国内外的挤出机大都存在着挤出温度偏高的现象,尤其对压型挤出机更是如此;另外对于挤出较小断面的胎侧制品,存在机头压力过高,双条挤出左右不对称等现象。这是两个必须解决的问题,在此根据调试中的经验作一个小结。 3.1 温度的控制该挤出机温控装置分为九段温控单元,分别对挤出机机头的上模、中模、下模、120挤出机和150挤出机的机筒挤出段、塑化段、螺杆分别进行工艺温度控制,以适应挤出生产过程的工艺要求。温控单元段的温度设定太低,胶料在机筒内的流动性不好,一方面造成机头压力过高,另一方面易使挤出胎侧的表面出现冷斑,而温控单元段的温度设定太高又直接提高了制品的挤出温度。调试中不妨做以下对比试验: φ150/φ120挤出机二复合液压机头挤出制品塑化段挤出段螺杆上模中模下模温度现象温度较低 45 ℃ 45 ℃ 60 ℃ 50 ℃ 50 ℃ 50 ℃ 110-113℃ 表面出现冷斑，机头压力偏高。温度中等 65 ℃ 65 ℃ 75 ℃ 65 ℃ 65 ℃ 65 ℃ 114-118℃ 表面光滑，端面上温度较为一致。温度偏高 85 ℃ 85 ℃ 90 ℃ 85 ℃ 85 ℃ 85 ℃ 120-125℃ 表面发蓝，且冒有大量的青烟。由上表可见,通过试验给温控装置确定一个适宜的设定值是很必要的。另外销钉机筒上的销钉一方面对胶料有着剪切与混炼的作用,另一方面还在胶料与温控介质问起到热传导的作用。调整销钉的排布对制品的挤出温度有一定的影响,但是范围较小,一般在1～2℃之间。 3.2 口型与流道的修配销钉机筒冷喂料挤出机经过了多年发展,技术上相对来说较为成熟,一般说来调试工作量不是太大。但是由于胶料的流体特性及配方的差异直接影响到胶料的挤出性能,不同用户的工艺要求和参数也会有比较大的不同,这就决定了液压机头在现场需要很大的修配工作量才能使得流道与口型能够挤出满足工艺要求的制品来。为了减少现场的修配工作量,口型与流道的修配必须明确一个合理的次序,以避免重复性的工作和口型板和流道板的报废: (1) 修磨流道板,以在不带口型板的情况下挤出胶片的断面为规则的矩形为准。修磨量一次不要过大,尽量避免由于补焊造成流道板变形; (2) 在流道挤出均匀的情况下,合理修磨预口型,使胶料能顺畅地过渡到口型处而不至于堵胶,增大机头压力; (3) 根据胶料的膨胀率和收缩率确定口型板的开型尺寸,一般口型板的开型由用户厂家有经验的工艺人员来完成; (4) 如果前三项都尝试过,胶料挤出还是不理想,可以考虑对配方作适当调整,同样可以改善挤出质量。因为螺杆是有旋向的,熔融的胶料经螺杆由机筒压入流道时,左右两侧在流量与流速上必然存在着差异,这一差异就需要通过修磨流道板中间的阻尼块来消除。在挤出双条胎侧时,流道两侧微小的不均匀会造成两条胎侧断面尺寸和挤出速度的不同,口型断面尺寸越小时这种情况越明显。这就需要花上大量时间做细致的工作去解决此问题。在刚开始挤出双条胎侧或小规格制品时,由于口型尺寸小,胶料温度较低,往往会造成机头压力骤然升高,机头因过载保护常使主机停机。我们在主操作台上增设了“低速启动”和“正常启动”切换按钮,开机时先以配方设定值40%的速度“低速启动”运行,机头压力冲击不至于过高,在挤出一段之后出胶趋于顺畅,机头压力降低并稳定下来,然后再切换到“正常启动”状态,就不会出现机头报警停机了。 3.3 均匀供胶挤出机如果喂料不均匀将直接影响到整条联动线的连续稳定的生产。喂料不均可能造成制品出现夹杂气泡,尺寸变化等,故供料机要能自动调整供料速度,适应挤出机连续均匀地挤出。同时,要避免喂人太大的胶团,防止喂料口堵胶。 4 联动装置备机台阔的协调联动生产线的自动化、联动化性能如何就看其内部机台间的协调能力如何。The host part of the host linkage production line is XJF-D150 × The 120 pin barrel cold feed double compound extruder unit mainly consists of two pin barrel cold feed extruders (including φ one hundred and fifty × 16D Extruder and φ one hundred and twenty × 14D extruder), 150/120 two composite hydraulic head, hydraulic power system, temperature control system, two feeders (including φ 150 Extruder feeder and φ 120 extruder feeder), steel frame platform, integral base, electrical control system, etc. Hydraulic head runner size (maximum width × Thickness): 480 × 20mm 2.2 The linkage device of auxiliary line is mainly composed of receiving conveyor, cooling roller table and width measuring device, uphill conveyor belt I, tire sidewall transition film device, uphill conveyor belt II, spray cooling device, downhill conveyor belt, fixed length cutting device, secondary air blowing and quick separation roller table, single final inspection scale, manual pickup roller table device, tire sidewall bridge conveyor belt, coiling conveyor belt It is composed of four station coiling device and production line electrical control system, and XJF-D150 × 120 Two compound pin barrel cold feed extruding units are used together, mainly for compound extruding of sidewall rubber of radial tire into double strips (or single strips) and subsequent receiving, cooling, cutting or coiling. 3 Two compound extrusion unit Two compound extrusion unit is the core of the whole linkage line. Its performance directly affects the quality of products, the extrusion temperature of products and the size of cross section. Most of the extruders at home and abroad have the phenomenon of higher extrusion temperature, especially for the press extruders; In addition, for the sidewall products with small cross section, the die pressure is too high, and the twin extrusion is asymmetric. These are two problems that must be solved. Here is a summary based on the experience in debugging. 3.1 Temperature control The extruder temperature control device is divided into nine temperature control units, which respectively control the process temperature of the upper die, middle die, lower die of the extruder head, the barrel extrusion section, plasticizing section and screw of the 120 and 150 extruders to meet the technological requirements of the extrusion production process. The temperature of the temperature control unit section is set too low, and the fluidity of the rubber material in the barrel is not good. On the one hand, the pressure of the die head is too high, on the other hand, it is easy to cause cold spots on the surface of the extrusion tire side. The temperature of the temperature control unit section is set too high, which directly increases the extrusion temperature of the products. The following comparative tests may be conducted during commissioning: φ 150/ φ The temperature of the upper die, middle die and lower die of the screw in the plasticizing section of the extrusion section of the second composite hydraulic die of the 120 extruder is lower. The temperature is 45 ℃, 45 ℃, 60 ℃, 50 ℃, 50 ℃, 50 ℃, 110 ℃ and 113 ℃. Cold spots appear on the surface, and the pressure of the die is higher. The temperature is medium 65 ℃ 65 ℃ 75 ℃ 65 ℃ 65 ℃ 65 ℃ 65 ℃ 114-118 ℃, the surface is smooth, and the temperature on the end face is relatively consistent. The temperature is 85 ℃, 85 ℃, 90 ℃, 85 ℃, 85 ℃, 85 ℃, 120 ℃ and 125 ℃ too high. The surface is blue and there is a lot of smoke. It can be seen from the above table that it is necessary to determine an appropriate setting value for the temperature control device through tests. In addition, the pins on the external pin barrel, on the one hand, play a role in shearing and mixing the rubber, and on the other hand, play a role in heat conduction between the rubber and the temperature control medium. The arrangement of adjusting pins has a certain influence on the extrusion temperature of products, but the range is small, generally between 1 ℃ and 2 ℃. 3.2 Mouth and runner repair The pin barrel cold feed extruder has been developed for many years and is relatively mature in technology. Generally speaking, the debugging workload is not too large. However, due to the difference of the fluid characteristics and formula of the compound, the extrusion performance of the compound will be directly affected, and the process requirements and parameters of different users will also be quite different, which determines that the hydraulic head needs a lot of repair work on site to make the runner and die can extrude products that meet the process requirements. In order to reduce the on-site repair workload, a reasonable order must be defined for the repair of the die and runner to avoid repetitive work and the scrapping of the die plate and runner plate: (1) The runner plate shall be polished, and the section of the extruded film without the die plate shall be the regular rectangle. The amount of grinding shall not be too large at one time, and the deformation of runner plate caused by repair welding shall be avoided as far as possible; (2) Under the condition of uniform extrusion of the runner, the pre die shall be grinded reasonably, so that the rubber can be smoothly transferred to the die without plugging, and the die pressure shall be increased; (3) The opening size of the die plate shall be determined according to the expansion rate and shrinkage rate of the rubber material. Generally, the opening of the die plate shall be completed by the experienced technicians of the user manufacturer; (4) If the first three items have been tried, the rubber extrusion is still not ideal. You can consider making appropriate adjustments to the formula, which can also improve the extrusion quality. Because the screw has a rotation direction, when molten rubber is pressed into the runner from the barrel through the screw, there must be a difference between the flow rate and flow rate on the left and right sides. This difference needs to be eliminated by grinding the damping block in the middle of the runner plate. When extruding twin sidewalls, small unevenness on both sides of the runner will cause differences in the section size and extrusion speed of the two sidewalls. The smaller the section size of the die, the more obvious this situation is. This requires a lot of time and careful work to solve this problem. At the beginning of extruding double sidewalls or small size products, due to the small size of the die and the low temperature of the rubber compound, the pressure of the head will often rise suddenly, and the head will often shut down the main engine due to overload protection. We have added "low speed start" and "normal start" switch buttons on the main operating platform. When starting up, we first "low speed start" at the speed of 40% of the formula setting value, so that the pressure impact of the head is not too high. After extruding a section, the rubber outlet tends to be smooth, the head pressure decreases and stabilizes, and then switches to the "normal start" state, so that the head alarm and shutdown will not occur. 3.3 The continuous and stable production of the whole linkage line will be directly affected if the feeding of the uniform feeding extruder is uneven. Uneven feeding may cause bubbles and size changes in the products, so the feeder must be able to automatically adjust the feeding speed to adapt to the continuous and uniform extrusion of the extruder. At the same time, it is necessary to avoid feeding too large a rubber ball to prevent the feeding mouth from plugging. 4. Coordination of linkage equipment, the automation and linkage performance of the linkage production line depends on the coordination ability between its internal machines.