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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Autor</th> <th class="thCornerR">Wiadomość</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>kinglovereas</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/Aniseed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Wysłany: Sob 13:49, 19 Mar 2011<span class="gen"> </span> Temat postu: ed hardy wholesale New surface grinder magnetizati</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">New surface grinder system magnetization demagnetization <br /> <br /> <br />Magnetizing current curve, the general surface grinder magnetization demagnetization system more by the regulator, intermediate relays, time relays and other components, the so automatic demagnetization, but the line complex, messy,<a href="http://www.ed-vs-cs.com" target="_blank" class="postlink">ed hardy wholesale</a>, high failure rate, and the demagnetization effect of less ideal. Here are a non-mechanical contact for the magnetization demagnetization system,<a href="http://www.monclercheapjackets.com" target="_blank" class="postlink">moncler cheap</a>, which constituted by the triac, without transformer, electric hand power directly to the rectified voltage 22OV. Principle circle shown in Figure 2. Second, the principle 1. Triac triac rectifier circuit can be based on the principle of double guide through change 8, Qu 1. Disk drive coil 2. Lost touch signal 3. Control unit 4. Sync consultations Figure 2 Schematic magnetization circle back 2 K8l to the trigger pulse timing Ld K can have both positive and negative currents through different directions. When the grid voltage positive half cycle, the trigger K8j and K both in the negative half,<a href="http://www.uggsbootsbillig.com" target="_blank" class="postlink">ugg boots billig</a>, triggering K8l and K, Pu input rectifier circuit at this time is positive. On the contrary, in the grid voltage negative half-cycle, the trigger K and K, and in positive half cycle, the trigger K81 and KS, rectifier circuit output is negative. In addition triac bridge rectifier circuit also can be used as exchange In the grid positive and negative half cycle current trigger KS, and KS (KS and K condemnation blockade trigger pulse), then Id have AC current will pass. Surface Grinder sucker typical inductive load coil, in the rectification work, the coil current is continuous, the waveform can be considered as a straight line. Rectifier output waveform shown in Figure 8. , Ding, 1 positive 2 negative rectifier rectifier 8 - AC voltage regulator rectifier output waveform in Figure 3 Figure 2. Control unit control unit formed by the integrated circuit, which has two operating states,<a href="http://www.monclerjacketssaler.com" target="_blank" class="postlink">Moncler sale</a>, namely, the state of magnetization and demagnetization. When the 220V power supply is closed, the control unit to start work, if they enter the closed state of demagnetization work, or work for the state of magnetization (see Figure 2) in the magnetization work, the control unit outputs a stable reference signal (+10 V ), and according to synchronized trigger pulse signal to the timing of distribution, making Bute is positive. Control unit has a PI regulator, the introduction of current feedback signal. Adjust potentiometer to change given the size of a given signal, the control unit will automatically adjust the SCR trigger phase, making the excitation current and the reference signal a considerable Bute. When fixed, Bute will remain stable,<a href="http://www.buy-cheapmbtshoes.com" target="_blank" class="postlink">mbt shoes sale</a>, without grid voltage and load change. Work in the demagnetization, the control unit resulted in a similar figure l (6) the shape of the given waveform. The role of the PI regulator, approved the variation automatically follow ‰. At this point the control unit not only to adjust the SCR trigger phase, but also to control the timing of the trigger pulse signal with a given shift and change. In the process of reversing the current rectifier circuit for a short time working in the inverter state (phase angle greater than 90.) Such that the trigger for the phase before the first persons on the anvil 1996 and back to zero, thus ensuring the safety barrier for the SCR. A total of 10l Hom positive and negative conversion time of 10 seconds. To further enhance the demagnetization effect and, finally, once the exchange demagnetization. Only this time rectifier K and Ⅱ 88 work. AC voltage regulator to control the angle from the gradually increasing, gradually decreasing AC current closure zero. AC demagnetization process, the control unit does not exceed the role of PI regulator. The total demagnetization time is about 15 seconds. Surface grinder in the grinding process, if a sudden loss of field will be dangerous. Magnetic signal with loss of control unit for the machine operator to use protection. When the excitation current less than a certain value, or Shu closed sets, the loss of the magnetic signal is valid, it will output the constant rain break contacts. Third, the application effect of the system for the transformation of M7480 system type grinder back Yao received satisfactory results: ① magnetizing current stability of less than 1, chu; ② workpiece after demagnetization remanence is less than 0.6 gauss {③ in debug load short-circuit the process was artificial, the result fuse () blow, loss of excitation signal is valid, the machine automatically stops working. Replace the fuse and start, as usual, found no damage to other electrical components; ④ The system has run two one and a half, running in good condition. Line structure of the system as simple, low cost, we will apply it to MTlg0 type of grinding machine, which greatly improved the demagnetization effect of the machine. IV, Conclusion This paper introduces a new line of magnetization demagnetization system is reasonable, simple structure, stable and reliable use of integrated circuits, demagnetization results are satisfactory. And low cost, as long as the changes in triac model, we can meet various types of surface grinding on the magnetization demagnetization systems. The system can support as the new and the old grinder with grinder transformation. Reference to the text spine [1] Huang truculent main Pian. Semiconductor converter technology. Machinery Industry Press, Beijing. 198O. 【2] Studies over the dust. Surface grinding machine PLC elections demagnetization system. 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