1. Abstract 

        This paper mainly introduces the combined application of weimar series products in the preshrink machine project produced in Pacific Ocean, reflecting the advantages and broad prospects of weimar products in this field.

       2. Process principle of woolen blanket pre-shrinking machine

       The purpose of the pre-shrinkage machine is to obtain a stable fabric size, generally require the shrinkage effect to reach the longitude and latitude shrinkage rate is less than 3%; , in addition to obtain a stable external size, but also improve the fabric feel and visual feel, so that the fabric to meet certain weight and stiffness requirements.

      Preshrinkage machine mainly for cotton, hemp, silk and viscose and other cellulose fiber fabric for pre-shrinkage, this kind of fabric moisture absorption is large, the fiber is easy to swell so that the fiber length is shortened, and then affect the size stability of the fabric and its blended fabric as the raw material. The basic process of the wet and hot preshrinkage machine is wet spraying - extrusion - drying. According to the different coating materials, it can be divided into two representative equipment, rubber blanket preshrinkage machine and cloth blanket preshrinkage machine. Their working principle is the principle of "bending deformation extrusion".

      3. Working principle of woolen blanket preshrinking machine

      The machine mainly has five links: overfeeding, press roller, blanket, blanket and cloth folding. The rollers in each link are driven by a frequency converter, and the diameters of each roller are different. Man-machine interface through input speed of the whole process, one blanket do give priority to the given speed frequency, due to the frequency converter size by dragging the roller diameter range, in order to make the machine in the running process of cloth tear and the quality of the cloth, other the frequency of the inverter in the PLC to the master of a given speed frequency is calculated out, in the process of cloth processing to keep the linear velocity of each roll with a line speed operation work but in running process to keep the cloth tension need to control the frequency of the inverter frequency conversion fine-tuning their feedback speed.

      In the tension control process, the frequency set speed of the overfeeding and the first blanket is determined by the main speed of the man-machine interface input, and the other frequency converters are adjusted by the main frequency feed and the frequency adjustment of the frequency converter to adjust the speed of the press roll, the second blanket and the folded cloth. The regulation of the frequency is adjusted by the pressure sensor between the pressure roller, the cloth and the previous link. The pressure sensor is 0-10V, connected to the simulation interface of the frequency converter, and the tension bending is controlled through the bending of 0-10V on the sensor in each link.

      4. Electric part introduction and implementation

      The main electrical control part of the carpet pre-reduction machine is composed of: 7 "PSM07 color screen +32DPH programmable controller + five VFT frequency converter, man-machine interface and 32DPH through the PLC 422 communication, the main set of frequency converter is able to pass the 32DPH type PLC 485 communication given. This strengthens the dominant position of Weimar products in the combination of supporting equipment, thus simplifying the positioning of the original Mitsubishi products and simplifying the complexity of products

      On PLC programming first want to solve the linear velocity between the roller and through the roller radius size calculation of the roller speed, given through the calculation of linear velocity of the consistent each frequency ratio relations, by the man-machine interface of a given frequency speed up, drag on the roller machine the size of the frequency converter adjusted speed, so as to achieve the linear velocity between the roller on the machine.

      In addition, the frequency of multiple frequency converters is given. The numerical value calculated by PLC is given by the communication protocol between PLC and frequency converter. In order to adjust the parameters timely and meet the adjustment of the machine speed, so that when the speed changes, the speed of the whole machine is not consistent.

       In the PLC program on the basis of no problem, the frequency simulation signal of the frequency converter to do bias adjustment in order to facilitate the frequency converter in a range of addition and subtraction, to adjust the speed through tension. The following is the parameter setting of the frequency converter:

     P0-00  0

     P0--01   1

     P0-03   2

     P4-18   30%

      P4-19   2

      If the above parameters are applied to the cloth carpet preshrinking machine, please set the gain adjustment according to the process requirements when controlling on other machines.

      5. Conclusion

       The pre-shrink machine manufactured in Shanghai Pacific occupies a large market in China, so if there is a development in this market, then weimar is a good platform for the promotion of weimar products in this field.