CN201493240U

CN201493240U - SPWM modulation wave vibrator used for color difference discrimination

Info

Publication number: CN201493240U
Application number: CN2009201874426U
Authority: CN
Inventors: 郑力新
Original assignee: Anhui Jiexun Optoelectronic Technology Co Ltd
Current assignee: Anhui Jiexun Optoelectronic Technology Co Ltd
Priority date: 2009-09-09
Filing date: 2009-09-09
Publication date: 2010-06-02
Anticipated expiration: 2019-09-09

Abstract

The utility model discloses a SPWM modulation wave vibrator used for color difference discrimination. SPWM wave signals are generated and output by a single-chip microcomputer, and then respectively connected to an input end of a half-bridge driver after being coupled through a photocoupler, and the output end of the half-bridge driver is connected with the input end of an H-bridge power amplifying circuit; the output end of the H-bridge power amplifying circuit is connected with a coil of an electromagnetic vibrator; one end of an electromagnetic vibrator iron core and one end of a first group of mechanical vibrating plate are fixed at one end of a U-shaped metal connector, the other end of the U-shaped metal connector is connected and fixed with one end of a second group of mechanical vibrating plate, and the middle part of the U-shaped metal connector is connected and fixed with a material receiving plate; and the other ends of the first and the second groups of vibrating plates and a housing of the electromagnetic vibrator are respectively connected and fixed on a bracket. Compared with the prior electromagnetic vibrator, the vibration frequency raises from 50 Hz to 100 Hz, the harmonic interference is small, and the uniformity of vibration during blanking is greatly improved.

Description

Be used for the SPWM modulating wave vibrator that aberration sorts

Technical field

The utility model relates to a kind of special vibrating device that is used for the aberration grading machine.

Background technology

At present, the electromagnetic vibrator of aberration grading machine (color sorting machine) usefulness generally all is to adopt the controllable silicon of single phase ac to drive, owing to adopt alternating current 220V to drive, the resonance point of itself and mechanical oscillation sheet is about 50hz, low, the humorous wave interference of vibration frequency is big, the vibration uniformity is poor, so the material vibration that enters receiving hopper is fallen to having caused adverse influence.

Summary of the invention

The purpose of this utility model is to provide that higher, the humorous wave interference of a kind of vibration frequency is little, vibration is used for the SPWM modulating wave vibrator that aberration sorts uniformly.

Its technical scheme is: a kind ofly be used for the SPWM modulating wave vibrator that aberration sorts, it is characterized in that: the SPWM ripple signal that produces output by single-chip microcomputer, after the photoelectrical coupler coupling, insert the input of half-bridge driver respectively, the output place end of half-bridge driver is connected with the input of H bridge power amplifier; The output of H bridge power amplifier is connected with the coil of electromagnetic vibrator; One end of electromagnetic vibrator iron core and an end of first group of mechanical oscillation sheet are fixed on an end of " U " type metal connector, the other end of " U " type metal connector and an end of second group of mechanical oscillation sheet are connected and fixed, and the centre and the receiver of " U " type metal connector are connected and fixed; The other end of first, second group mechanical oscillation sheet and the shell of electromagnetic vibrator are fastened on the support respectively.

Above-mentioned single-chip microcomputer produces the SPWM ripple signal of output and is controlled by communication interface by host computer.

Its technique effect is: because the characteristics of SPWM ripple are both can frequency conversion, can change amplitude again, so earlier by adjusting the frequency that improves the mechanical oscillation sheet, then, again by revising the frequency setting in the SCM program, make the SPWM wave frequency of single-chip microcomputer output and the frequency of electric and magnetic oscillation and the frequency of mechanical oscillation sheet group be in resonance range,, just can regulate its vibratory output by the amplitude that host computer is regulated the SPWM ripple.Therefore, SPWM modulating wave vibrator of the present utility model has very high flexibility and adaptability, and it is compared with existing electromagnetic vibrator, and vibration frequency is brought up to 100Hz by 50Hz, and humorous wave interference is little, and the uniformity of blanking vibration is greatly improved; And the installation compatibility of mechanical oscillation sheet conventional way, be easy to realize of the transformation of conventional vibration device to New type of S PWM ripple vibrator.

Description of drawings

Fig. 1 is an electric theory diagram of the present utility model;

Fig. 2 is the mu balanced circuit electrical schematic diagram;

Fig. 3 is the single-chip microcomputer electrical schematic diagram

Fig. 4 is the communication interface electrical schematic diagram;

Fig. 5 is that photoelectricity coupling and H bridge drive electrical schematic diagram;

Fig. 6 is the annexation schematic diagram of electromagnetic vibrator and mechanical oscillation sheet.

The specific embodiment

Shown in Fig. 1,3, in the present embodiment, the C8051F330 chip that single-chip microcomputer adopts the Xinhua dragon to produce.This chip has 3 road PCA modules and 4 timers, can produce 5 road independent adjustable SPWM ripples.The symmetric sampling method is adopted in the generation of SPWM ripple, promptly a half-sinusoid cycle is divided into 16 triangular wave cycles, and carrier wave ratio is 16, by earlier sine wave being divided into 16 five equilibriums when the program initialization, calculates the value of each point, utilizes and simplifies formula t _Pw=T _s(1+ α sin ω ₁T)/2 calculate the time of each height pulse, just pulse can be dealt into the I/O mouth by interrupting handling function.The SPWM ripple signal that the P0.0 of single-chip microcomputer and P0.1 pin produce, both are antilogical each other.When being P0.0 output high level, P0.1 is output as low level; During the P0.0 output low level, P0.1 exports high level.

The photoelectrical coupler (see figure 5) adopts two TLP250 chips, and the 3rd pin of its input is connected with the P0.1 pin with single-chip microcomputer P0.0 respectively, and the 7th pin of its output inserts the input of half-bridge driver respectively.

Half-bridge driver adopts two IR2103 chips.7 pin of this chip and 5 pin are reverse logic each other, finally drives two power field effect pipe IRF840 on the H bridge, and during one of them conducting, another must be closed.

The output of H bridge power amplifier is connected with the coil 62 of electromagnetic vibrator 6 by being arranged on the middle socket J6 of H brachium pontis.One end of electromagnetic vibrator 6 (see figure 6) iron cores 63 and an end of first group of mechanical oscillation sheet 1 are fixed on an end of " U " type metal connector 4, the other end of " U " type metal connector and an end of second group of mechanical oscillation sheet 2 are connected and fixed, and the centre and the receiver 3 of " U " type metal connector are connected and fixed; The shell 61 of first, second group mechanical oscillation sheet other end and vibrator is fastened on respectively on the support 5.

Above-mentioned single-chip microcomputer produces the SPWM ripple signal of output, is controlled by communication interface MAX3221 by host computer.

The working power VCC of above-mentioned single-chip microcomputer C8051F330 and communication interface inserts integrated package of pressure-stabilizing AS1117 by the Switching Power Supply on the grading machine through socket J1, and (see figure 2) is provided after voltage stabilizing.The power supply VCC1 of photoelectrical coupler is inserted by socket.The supply voltage VDD of H bridge obtains behind the bridge diode rectifying and wave-filtering of alternating current 220V with routine.Socket J4 is 9 core serial ports seat D139 of a standard, and the serial ports of host computer is received communication interface MAX3221 by it, through the level conversion (see figure 4) of MAX3221, forms TX and RX signal, receives 16 and 17 pin of single-chip microcomputer.Socket J5 is that the program of single-chip microcomputer is write inlet, i.e. the GTAG mouth of standard.The program of single-chip microcomputer mouth thus writes with special fever writes and solidifies.

Its course of work: after system powers on, host computer sends vibratory output parameter and start-up control order by socket J4 and communication interface MAX3221 to single-chip microcomputer C8051F330, the P0.0 of single-chip microcomputer and P0.1 pin produce SPWM ripple signal, when P0.0 is high level, the P0.1 output low level, 7 pin output low levels of left side photoelectrical coupler, and 7 pin of right side photoelectrical coupler output high level; Then, the HD output low level LO of left side photoelectrical coupler exports high level, the HD output high level of right side photoelectrical coupler, LO output low level; The power field effect pipe IRF840 in H bridge left side turn-offs, the IRF840 conducting of bottom, and the IRF840 conducting of right upper portion, the IRF840 of bottom turn-offs.Causing the positive terminal voltage of VDD to be turned left from the right side is added on the coil of the vibrator that J6 connects.Otherwise, then anti-, promptly on the coil that the positive terminal voltage of VDD is added to J6 from left to right and is connect, so, coil and obtain the impulse wave of positive and negative both direction.Obviously, the pulse width of impulse waveform depends on the width of P0.0, P0.1 level, and this width size is the rule result calculated of single-chip microcomputer by sine wave modulation.Therefore, this impulse wave is theoretic SPWM ripple.The coil of electromagnetic vibrator produces magnetic field under the excitation of SPWM ripple, inhale moving iron core, produce resonance with first group of mechanical oscillation sheet linking together 1, second group of mechanical oscillation sheet 2, " U " type metal connector 4, support 5 and receiver 3, make that the material on the receiver can flow out smoothly along blanking port 31.

Claims

1. one kind is used for the SPWM modulating wave vibrator that aberration sorts, it is characterized in that: the SPWM ripple signal that produces output by single-chip microcomputer, after the photoelectrical coupler coupling, insert the input of half-bridge driver respectively, the output place end of half-bridge driver is connected with the input of H bridge power amplifier; The output of H bridge power amplifier is connected with the coil of electromagnetic vibrator; One end of electromagnetic vibrator iron core and an end of first group of mechanical oscillation sheet are fixed on an end of " U " type metal connector, the other end of " U " type metal connector and an end of second group of mechanical oscillation sheet are connected and fixed, and the centre and the receiver of " U " type metal connector are connected and fixed; The other end of first, second group mechanical oscillation sheet and the shell of electromagnetic vibrator are fastened on the support respectively.

2. according to claim 1ly be used for the SPWM modulating wave vibrator that aberration sorts, it is characterized in that: described single-chip microcomputer produces the SPWM ripple signal of output and is controlled by communication interface by host computer.