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彩涂板生产线张力辊组应怎样分布才使线上各功

发布者:唐山天物彩板有限    发布时间:2019-09-01 08:38
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彩涂板生产线张力辊组应怎样分布才使线上各功能区内的张力保持恒定

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  由于彩涂板生产线上的各个功能区所需求张力的大小有所不同,因此张力辊组通常是置于每个功能区域的人口和出口位置,这样安排有两种好处:一是可以使生产线在运行过程中每个区内的张力保持恒定并可单独控制调节;二是可以使生产线上各个功能区被分隔开来,形成相对独立的区间,相邻两区的张力不会相互影响。例如

  彩涂板生产线的人口段与人口活套之间通常是由1号张力辊组作为分隔点(见图3-2),在生产线运行期间,当上一卷钢带走完,需要上新卷时,人口段要进行小车送卷、开卷机开卷、切带头、与上一卷的带尾接缝、去毛刺等一系列的操作,而这些操作都要占用一段时间,且不能影响生产线工艺段运行的连续性,此时,1号张力辊通过缓冲辊将上一卷的带尾夹紧,让入口段相对独立开来,而入口活套则通过放套将原来所贮存的钢带量按工艺段的速度释放,使工艺段保持正常运行。入口活套与工艺段之间是以2号张力辊组作为分隔点,因为入口活套在每一卷的始末都要实施充套和放套功能的操作,且活套内的张力的大小与工艺段的张力要求不同。因此,入口活套同样不能够影响工艺段的运行。

  工艺段内的几个功能区域也需要用张力辊组分隔,例如:钢带清洗化涂区因为要经过碱液的压力喷淋、刷洗机刷辊的磨刷处理和挤干辊的挤压,接触面较多,所受的摩擦力较大,在这个区域的张力值要求大一些。因此,此区与彩涂板涂层区通常会用3号张力辊组分隔;另外,固化炉内的钢带要求平稳,张力波动要小,且钢带的悬垂度需要通过张力辊组随时调整,因此,初涂固化区与清涂固化区通常要用4号张力辊分隔:工艺段与出口活套之间要用5号张力辊组来分隔。

  同样,出口段要承担彩涂板的下线、前后两卷接缝的分切的,有些还要进行涂后保护膜等功能操作,出口活套此时也要进行充套和放套操作,因此,出口活套与出口段之间不能相互影响,像入口段那样,要用6号张力辊分隔。

  另外,张力辊组除了对生产线各功能区起分隔和施加力量拖动钢带作用之外,某些位置的张力辊还起到生产线速度基准辊的作用。从图3-2上所示,1号张力辊和6号张力辊是生产线的入口和出口段的速度基准辊,而4号张力辊则是生产线工艺段的速度基准辊,即4号张力辊的速度就是生产线速度。在生产过程中,不管速度基准辊的张力如何,都必须保持给定的转速,通过对这三个速度基准辊的直接控制,可使生产线保持在平稳的速度下运行,其如2号、3号和5号张力辊,以及开卷机和卷取机都是负责配合其对应的速度基准辊将钢带绷紧,属于间接张力控制。

  总的来说,彩涂板生产线的工艺越复杂即操作功能越多,则张力的分隔区就越多,张力控制就会越复杂。

Because the tension required in each functional area of the color painting production line is different, the tension roll group is usually placed in the population and outlet position of each functional area. This arrangement has two advantages: one is that the tension in each area of the production line can be kept constant during operation and can be controlled and adjusted separately; the other is that the tension roll group can be placed in the population and outlet position of each functional area. So that each functional area on the production line is separated to form a relatively independent area, the tension of the two adjacent areas will not affect each other. for example
 
 
The population section of the production line is usually separated from the population looper by tension roll group No. 1 (see Figure 3-2). During the operation of the production line, when the last coil of steel strip is gone and new coils are needed, the population section should carry out a series of operations, such as trolley feeding, uncoiler uncoiling, tape cutting head, tail seam with the last coil, deburring and so on. At this time, the No. 1 tension roll clamps the tail of the upper coil through the buffer roll to make the entrance section relatively independent, while the entrance looper releases the original stored steel strip quantity according to the speed of the process section by releasing the looper. Section maintains normal operation. The No. 2 tension roll group is used as the separating point between the inlet looper and the process section, because the inlet looper must perform the operation of filling and releasing functions at the beginning and end of each volume, and the tension in the looper is different from the tension requirement of the process section. Therefore, the inlet looper can not affect the operation of the process section.
 
 
Several functional areas in the process section also need to be separated by tension rollers. For example, the steel strip cleaning coating area needs more contact surface and more friction because of pressure spraying of alkali solution, brushing treatment of brushing roller of brushing machine and extrusion of extruding roller. Therefore, the zone and the coating zone are usually separated by tension roll No. 3. In addition, the strip in the curing furnace should be stable, the tension fluctuation should be small, and the drape of the strip needs to be adjusted at any time through the tension roll group. Therefore, the initial solidification zone and the cleaning solidification zone are usually separated by tension roll No. 4: 5 between the process section and the outlet looper. No. 1 tension roll set to separate.
 
 
Similarly, the outlet section should undertake the cutting of the bottom line and the front and back seams of the color coating roll, and some of them also need to carry out the protective film after coating and other functions. At this time, the outlet looper should also carry out the operation of filling and releasing. Therefore, the outlet looper and the outlet section can not interact with each other, as in the import section, it should be separated by tension roll No. 6.
 
 
In addition, the tension roll group not only separates and exerts force to pull the steel strip in each functional area of the production line, but also plays the role of speed reference roll in some positions of the production line. As shown in Figure 3-2, No. 1 and No. 6 tension rolls are speed reference rolls at the entrance and exit sections of the production line, while No. 4 tension rolls are speed reference rolls at the process section of the production line, that is, the speed of No. 4 tension rolls is the speed of the production line. In the production process, regardless of the tension of the speed reference roll, the given speed must be maintained. Through the direct control of the three speed reference rolls, the production line can keep running at a steady speed, such as No. 2, No. 3 and No. 5 tension rolls, as well as the uncoiler and coiler are responsible for matching their corresponding speed base. The quasi-roll tightens the steel strip, which belongs to indirect tension control.
 
 
Generally speaking, the more complex the process of the color coating production line is, that is, the more the operating functions, the more the tension compartments and the more complex the tension control will be.
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