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| The use and development of the engraving head of electronic engraving machine |
| 1.1 the principle and characteristics of the common structure Generally speaking, magnetic steel to produce steady flux control coil generates magnetic flux control, differential superposition of two armature motion driven electromagnetic force, driven by the armature. 1.2 rotary electromagnet Principle and structure as shown in Figure 1 "2", a magnetic steel in the air gap produced a steady magnetic field, in the case of the control coil is not energized, through debugging assembly, armature in the relative equilibrium position; when control the energized coil, the armature is polarized, and magnetic force driving the rotation of the armature, figure shows the armature of a polarization. When the control coil current or voltage of the high frequency variations, the armature to produce the high frequency oscillating drive carving knife carving work. High stiffness of the return spring is using armature where the torsion bar elastic torsion to obtain, has the advantages of simple structure, high stiffness, easy to implement; and with steady magnetic field adjusting structure, can adjust the working point of the magnet system, the magnetic steel play the best efficiency; control coil only a, and usage of the two control coil compared, the structure is simplified, the volume is reduced. Hell swing type electric carving machine adopts the engraving head as shown in Figure 2, the armature structure as shown in figure 3. Through the swing of the armature driven diamond graver carved and recess in the version and, using torsion bar torsional deformation to achieve high stiffness function of the return spring, and the semi-circular end is used to adjust torsion bar stiffness, output rod with damping ring to regulate the output characteristics of the electromagnetic system. 1.3 direct acting electromagnet "2-3" Principle and structure as shown in Figure 4, with carving knife straight moving shaft is fixed on the armature, assembly adjustment armature to a state of relative balance in a magnetic field, when the control coil is not energized, magnetic gravitation cannot be makes the armature movement; when the coil power control, the armature to produce polarity, under the action of electromagnetic force, overcome the armature stiffness, exercise a certain displacement. High frequency voltage or current to the control coil, armature movement, so as to drive the vertical movement of the carving knife, carved and recess on version of roller. In this structure, the movement of the armature is translation, the air gap on both sides is the synonym magnetic pole; high stiffness recovery spring through the armature of elastic deformation. Some foreign companies adopt the structure principle, also can achieve very high frequency. The electromagnet structure of the structure is more complex, the volume is larger, assembly and debugging also have certain difficulty. Advantages in electronic mechanical engraving, hell company engraving head carving frequency by first 4000Hz development to today's 12800Hz, MDC vision3 engraving head to 8100Hz, reach 8600Hz in net hole depth diminished, and improve the production efficiency and electronic engraving with carving network points of depth and area may change, reproducible, and in the carving process without pollution. |
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