测头
PMGG201

紧凑和坚固的设计，加上对于轧机恶劣环境的完全免疫，使其在原来不能安装的位置上实现精确测量。

功能
MTG 系统基于PEC（脉冲涡流）技术, 用于测量有色金属带材和箔材的厚度。由于MTG与被测材料无关，因此无需进行合金补偿和标定。除了金属材料外，这种技术对测量区内的其他物质都不敏感。因此，这种测厚仪能够精确测量金属带材和箔材，而不受冷却液、轧制油、灰尘、气温变化等外界因素的影响。
由于MTG与被测材料无关，因此无需进行合金补偿和标定。

可追踪的厚度测量
 盒计MTG的校准和使用。完成全部测量范围内的系统标定，共需要十二块标定板。

这些校准板确保测量仪测量的绝对厚度和厚度偏差，根据多年的经验，通常6个月校准一次，且只需要20分钟的时间。

坚固的设计
铝铜合金外壳具有优越的机械和化学特性，并提供了强大的保护，是应对恶劣轧制环境的理想选择。它是安装在一个垂直移动的框架上，由液压系统控制，自动调整上下位置，以保持最佳的测量距离。


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数据

Type PMGG 123-S
Minimum/Maximum thickness 0.5 - 8 mm (20 - 315 mil)
Measured alloys Aluminium, clad aluminium and other nonferrous alloys
with resistivity range 27 - 65 nΩm
Repeatability ±0.05% (not better than 0.3 μm (12 μin)
Accuracy 1 ±0.05% (not better than 0.5 μm (20 μin)
Total Accuracy 2 ±(0.05% +1.5 μm (59 μin)
Total Accuracy clad measurement 3 ±(0.05% +2 μm (79 μin)
Oil on strip No influence
Measuring distance 15 mm (590 mil)
Minimum strip width 500 mm (20 in)
Minimum distance from strip edge 100 mm (4 in)
Measuring area Ø 80 mm (3.15 in)
Strip position changes > 1 mm/s / >39 mil/s ±5 mm (± 197 mil)
Strip slope ±3°
Gauge holder stroke length 50 mm (2.0 in)
Updating time
 5 ms
Operation temperature
 +5 to +70°C (+41 to +158°F)
Degree of protection IP 65
Power supply (from the control unit) 24 V DC, max 3 A (48 V AC, max 5A)
Dimensions
Gauge head L 352 x W 228 x H 209 mm
(L 13.9 x W 9.0 x H 8.2 in)
Gauge head and holder L 495 x W 228 x H 353/403 mm
(L 19.5 x W 9.0 x H 13.9/15.9 in)
Weight
Gauge head 22 kg (48.5 lb)
Gauge holder 48 kg (105.8 lb)

1) Accuracy = Calibration accuracy, i.e. accuracy after calibration, measured on a calibration plate.
2) Total Accuracy = Accuracy after calibration, measured on an arbitrarily selected plate/strip at normal mill operating conditions, i.e. with mill coolants, temperature variations, pass line variations and alloy composition variations.
3) Provided that input clad parameters are correct.

应用

MTG测厚盒子专为铝轧机和铝铸轧机设计。在任何位置，即便是连轧机的中间机架间，测厚盒子都能提供可靠和精确的厚度测量。因此MTG测厚盒子是所有AGC系统的理想的选择，控制平均厚度的同时减少厚度偏差。

增加轧机运行时间
在轧机每天24小时的运行中，每一分钟都是十分重要的。MTG 的使用可保证用户的生产时间。由于不需要合金补偿，MTG可连续工作，不需要经常停机设定补偿曲线及标定。

确保带材公差
由于能够生产具有更小公差的金属带材，最大限度地提高了生产力，降低了非一致性带材的损耗。更小公差的产品也使金属带材生产商满足带材用户不断增加的公差要求。

PEC脉冲涡流技术

MTG 系统基于PEC（脉冲涡流）技术, 用于测量有色金属带材和箔材的厚度。系统通过弱磁场进行测量，完全对人体无害。

除了金属材料外，这种技术对测量区内的其他物质都不敏感。因此，这种测厚仪能够精确测量金属带材和箔材，而不受冷却液、轧制油、灰尘、气温变化等外界因素的影响。

由于MTG与被测材料无关，因此无需进行合金补偿和标定。

Phase 1: Transmitting

  • An electric field is generated with a transmitting coil
  • The field is applied until it fully penetrates the strip
  • The field "energy" is stored in the air gap and in the strip
  • The amount of energy stored in the strip depends on the thickness alone - not on resistivity

Phase 2: Distance measurement

  • Fast air response just after transmit field is swithed off
  • The measurement of air gap energy corresponds to distance between coil and strip
  • Pulse time t1 is typically less than 5μs

Phase 3: Resistivity measurement

  • Response from the surface area of the strip
  • The measurement starts when the air gap signal has declined
  • The measurement of the surface response corresponds to resistivity and is dependent on the speed of the field leakage out of the strip

Phase 4: Thickness measurement

  • Response from the whole strip
  • The measurement starts when the air gap signal has declined (phase 3 is included in phase 4)
  • The measurement of the whole strip corresponds to the complete energy stored in the strip, and continues until the strip response has almost declined (t3)
  • The measurement corresponds to the strip thickness
  • The resistivity does not affect the level of the whole strip response
  • The tail part after t3 is calculated with the use of the resistivity part

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