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PFEA112-20 3BSEO50091R20 ABB 張力控制器

為了控制張力，需要構(gòu)成張力控制系統(tǒng)。因?yàn)閺埩χ荒茉趦蓚€(gè)(或兩個(gè)以上)具有驅(qū)動(dòng)(或制動(dòng))力矩的工藝設(shè)備間形成，所以張力控制系統(tǒng)是在兩個(gè)傳動(dòng)控制系統(tǒng)基礎(chǔ)上構(gòu)成的。其中一個(gè)傳動(dòng)控制系統(tǒng)作為張力控制系統(tǒng)的速度基準(zhǔn)，稱為速度基準(zhǔn)系統(tǒng)，而另一個(gè)傳動(dòng)控制系統(tǒng)按張力要求建立負(fù)載，形成張力，實(shí)質(zhì)是對(duì)速度基準(zhǔn)系統(tǒng)按要求張力進(jìn)行速度跟隨，稱為張力可控的速度跟隨系統(tǒng)。張力控制的任務(wù)一般多放在后一系統(tǒng)上，所以人們習(xí)慣地只將后者稱為張力控制系統(tǒng)。

張力控制系統(tǒng)由于應(yīng)用場(chǎng)合、設(shè)備、構(gòu)成原理不同而多種多樣。但按結(jié)構(gòu)形式、控制原理可大致將其歸納為直接張力控制系統(tǒng)、間接張力控制系統(tǒng).活套張力控制系統(tǒng)三大類。

直接張力控制系統(tǒng)

通過張力檢測(cè)環(huán)節(jié)(張力檢測(cè)傳感器）實(shí)現(xiàn)對(duì)張力的閉環(huán)反饋控制的系統(tǒng)。卷取機(jī)和軋機(jī)機(jī)架間的直接張力控制系統(tǒng)分別如圖1(a)、 (b)所示。

實(shí)現(xiàn)直接張力控制，首先要有張力檢測(cè)傳感器(張力計(jì))。它被裝在張力測(cè)量機(jī)構(gòu)的張力輻下(見圖1)。張力計(jì)實(shí)為壓力計(jì)，現(xiàn)用的壓力計(jì)有壓磁式．感應(yīng)式、電阻應(yīng)變片式等多種型式。

直接張力控制大多用于張力調(diào)節(jié)范圍大，精度要求高及易于安裝張力計(jì)的場(chǎng)合，或在無法構(gòu)成間接張力控制系統(tǒng)時(shí)使用。

有時(shí)為了提高張力調(diào)節(jié)動(dòng)態(tài)及靜態(tài)性能，擴(kuò)大張力調(diào)節(jié)范圍，用間接張力控制實(shí)現(xiàn)粗調(diào)，起擾動(dòng)補(bǔ)償作用，用直接張力控制實(shí)現(xiàn)精調(diào)，兩者合在一起構(gòu)成張力復(fù)合控制。

直接張力控制和張力復(fù)合控制多應(yīng)用于帶材、箔材冷軋機(jī)或連續(xù)加工線的卷取機(jī)或其機(jī)架間、加工設(shè)備間的張力控制上。

In order to control the tension, it is necessary to construct a tension control system. Because tension can only be formed between two (or more) process equipment with driving (or braking) torques, the tension control system is constructed on the basis of two drive control systems. One of the transmission control system as the speed reference of the tension control system, called the speed reference system, and the other transmission control system according to the tension requirements to establish the load, the formation of tension, in essence, the speed of the speed reference system according to the required tension to follow the speed, called the tension controllable speed following system. The task of tension control is generally placed on the latter system, so people are accustomed to only referring to the latter as the tension control system.

Tension control systems are varied due to different applications, equipment and composition principles. However, according to the structure and control principle, it can be roughly summarized into direct tension control system and indirect tension control system. Looper tension control system three categories.

Direct tension control system

The system realizes the closed-loop feedback control of tension through the tension detection link (tension detection sensor). The direct tension control system between coiler and mill stands is shown in Figure 1(a) and (b) respectively.

To achieve direct tension control, you must first have a tension detection sensor (tensiometer). It is mounted under the tension spoke of the tension measuring mechanism (see Figure 1). The tension gauge is actually a pressure gauge, and the current pressure gauge has a piezomagnetic type. Induction type, resistance strain gauge type and many other types.

Direct tension control is mostly used in situations where the tension adjustment range is large, the accuracy is high and the tensiometer is easy to install, or when an indirect tension control system cannot be formed.

Sometimes, in order to improve the dynamic and static performance of tension regulation and expand the range of tension regulation, indirect tension control is used to achieve rough adjustment, play the role of disturbance compensation, and direct tension control is used to achieve fine adjustment.

Direct tension control and tension compound control are mainly applied to the tension control of strip and foil cold rolling machine or coiler of continuous processing line or between its frame and processing equipment.

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