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新莆京股份

CHINSC

节能环保 绿色科技 和谐发展 造福人类

19

2017

-

09

变频器在纸机同步传动控制系统的应用

作者:


  目前我国造纸厂家众多,可是普遍存在着自动化控制水平较低、能耗高、纸品的质量和产量在一定程度上受限制等状况。而随着社会经济的高速发展,人们对纸张的消费数量和纸张的质量要求也越来越高,这就要求造纸企业不断提高生产工艺和自动化生产水平,使纸产品能够满足日益发展的经济需求。

  一、造纸机变频控制系统简介

  造纸机结构上大致有流浆箱、网部、压榨部、干燥部、压光、收卷等几部分组成。传动系统是由多分部传动点组成的速度链式协调系统。使用变频控制系统可以使传动系统具备非常方便及精确的调速功能:

  (1)各分部传动点之间能保持固定的传动比,使各传动点上线速度保持一致。便于设备提速、减速,避免各传动点之间因线速度相差太大而断纸。

  (2)连续平稳地拖动纸机运行。

  (3)具有平滑加减速功能。

  (4)每点都可以单独启停,单独微调,且设有爬行和加速功能。

  (5)各个点之间存在一个速度链关系,即“前段速度改变,后者自动跟随”。

 

  一、纸机生产线同步控制有以下4种方式

  1、倍率调速盒+滑差调速电机

  此方法在早期纸机生产线上应用广泛。因采用电磁滑差调速电机浪费电能大,现已逐渐淘汰。

  2、同步控制器+SVF-EV变频器+鼠笼式Y系列异步电机

  有多路输入/输出。用多圈高精度电位器(2.2KW)调节同步控制器,在同步控制器内设置速度链模式,然后再由同步控制器输出4-20mA/0-10V模拟信号控制各台变频器。优点:改造简单费用低。缺点:模拟信号容易受到干扰,精度不高,易断纸、使用寿命一年半左右。

  3、PLC主机+D/A模块+SVF-EV变频器+鼠笼式异步电机(Y系列/4极)

  将开关量(如按钮)信号给PLC,进行BIN整数/浮点数二进制运算,然后将0-4000数字值通过D/A模块转换为4-20mA或0-10V模拟信号输出到变频器。优点:线速精度比同步控制器高。停电可以保持记忆。用按钮替代电位器。保证了精度。缺点工程改造费用较高。仍然存在模拟量精度不高的问题。(下图为6个点同步模拟量输出控制系统用到2个D/A模块)

  4、PLC与SVF-EV变频器进行主从通讯方式

  SVF-EV变频器的Modbus通讯方式采用主从方式的查询-相应机制,只有主站发出查询时,从站才能给出响应,从站不能主动发送数据。PLC作为主站,接收外部信号(如按钮),通过485通信端口,与作为从站的各台变频器进行通讯,发送命令和接收数据。并可通过触摸屏进行实时监控。

  由于采用的是主从通讯方式,同步精度高,几乎不会受到干扰。而且省去了纸机行业传统控制方式所用的D/A模块。

 

  三、改造后的效益

  1、能耗降低最少可节约电费30%以上。

  2、实现了数字化管理,操作简便。

  3、变频的软起停,降低机械磨损。

  4、减轻工人劳动强度,节约维修费用。

  5、减少开机断纸调试,减少断纸率,提高产量及效率。

这里是占位文字

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