JP2010120769A - Conveying system for article to be conveyed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveying system for an article to be conveyed increased in conveying capacity in an area where the commercial frequency of a commercial power supply is 50 Hz. <P>SOLUTION: This conveying system for an article to be conveyed includes an electromagnetic vibrator 4 for conveying the article to be conveyed by providing vibration to the article and an inverter 3 for converting the frequency of the commercial power supply to a frequency higher than 50 Hz and outputting the high frequency to the electromagnetic vibrator 4. The resonance frequency of the electromagnetic vibrator 4 is set to a frequency lower than the output frequency of the inverter 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transport system for a transported object that includes an electromagnetic vibrator that transports the transported object by applying vibration to the transported object, and an inverter that controls driving of the electromagnetic vibrator.

  As the above-mentioned electromagnetic vibrator, in addition to electromagnetic feeders that are optimal when the transport distance of limestone, iron ore, coke, chemical fertilizer, resin pellets, etc. is long and requires large transport capacity, electronic parts, pharmaceuticals, etc. Parts feeders that are optimal for the alignment and transport of small articles have already been proposed.

In general, an electromagnetic vibrator is a combination mechanism of an electromagnet and a spring, which periodically supplies current to an electromagnetic coil, and vibrates due to the interaction between the magnetic attraction force generated intermittently and the restoring force of the spring. Obtained and transported object.
In order to periodically apply a current to the electromagnetic coil, an alternating current having a commercial frequency from a commercial power source is full-wave rectified or half-wave rectified to the electromagnetic coil, and the current obtained by rectification is applied to the electromagnetic coil. It has been broken.

By the way, the electromagnetic vibrator as described above efficiently conveys the object to be conveyed while suppressing power consumption by setting the resonance frequency when it vibrates to a value that matches the commercial frequency that is the driving frequency. To be able to.
However, from the viewpoint of vibration stability of the electromagnetic vibrator, it is desirable that the driving frequency of the electromagnetic vibrator is slightly higher (higher) than the resonance frequency. That is, it is desirable to set the resonance frequency to a frequency slightly lower (lower) than the drive frequency. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 9-67008 (see paragraph 0016)

  According to the electromagnetic vibrator having the above configuration, when the commercial power supply is used in an area where the commercial frequency is 50 Hz, the resonance frequency of the electromagnetic vibrator is set to a frequency slightly lower (lower) than 50 Hz. However, in such a case, since the frequency for driving the electromagnetic vibrator is lower than in the region where the commercial frequency of the commercial power supply is 60 Hz, the number of times of driving the electromagnetic vibrator is reduced, and there is an inconvenience that the conveyance capacity is lowered. there were.

  Incidentally, it is conceivable that 50 Hz alternating current is full-wave rectified and converted into a drive signal having a frequency of 100 Hz, and the electromagnetic vibrator is driven by the converted 100 Hz drive signal. However, in this case, although the number of times of driving is twice as high as 50 Hz, the driving voltage is lowered because of the high frequency, and in reality, the carrying capacity cannot be increased.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the conveyance system for to-be-conveyed objects which can improve conveyance capability in the area | region where the commercial frequency of a commercial power source is 50 Hz.

  The transport system for a transported object according to the present invention converts the power frequency of an electromagnetic vibrator for transporting the transported object by applying vibration to the transported object and a commercial power source to a frequency higher than 50 Hz, and the electromagnetic vibration. And an inverter for outputting to the machine, and the resonance frequency of the electromagnetic vibrator is set to a frequency lower than the output frequency of the inverter.

  In the transport system for the object to be transported, the inverter is configured such that the inverter converts the power frequency of the commercial power source to a frequency higher than 50 Hz and outputs it to the electromagnetic vibrator, and the resonance frequency of the electromagnetic vibrator is The frequency is set lower than the output frequency of the inverter. Therefore, even when the commercial power supply is used in an area where the commercial frequency is 50 Hz, the electromagnetic vibrator can be resonated at a frequency higher than 50 Hz.

  The resonance frequency of the electromagnetic vibrator and the output frequency of the inverter may be set to any frequency as long as the frequency exceeds 50 Hz. However, when the frequency is 100 Hz or higher, the number of times of driving increases because of the high frequency, while the driving voltage per time decreases. Therefore, in the case of conveyance that requires a particularly large output, it is preferable to use a frequency of less than 100 Hz.

  In addition, the inverter is disposed at a predetermined distance from the electromagnetic vibrator, and a direct current reactor is disposed on the output side of the inverter, thereby suppressing radiation noise and induction noise, and insulation of the electromagnetic coil by a surge voltage. It is effective in preventing damage and reducing leakage current due to long-distance wiring.

  Furthermore, by arranging a zero-phase reactor on the output side of the inverter, it is effective in reducing noise for a frequency band of approximately 1 MHz or more on the output side of the inverter.

  In addition, by arranging the zero-phase reactor also on the input side of the inverter, it is effective in reducing noise for a frequency band of approximately 1 MHz or more on the input side of the inverter.

  In the present invention, the inverter converts the power frequency of the commercial power source to a frequency higher than 50 Hz and outputs the frequency to the electromagnetic vibrator, and the resonance frequency of the electromagnetic vibrator is set to a frequency lower than the output frequency of the inverter. Even when the commercial power supply is used in an area where the commercial frequency is 50 Hz, the electromagnetic vibrator can be made to resonate at a frequency higher than 50 Hz. Therefore, it is possible to provide a transport system for an object to be transported that can improve the transport capability in an area where the commercial frequency of the commercial power source is 50 Hz.

Hereinafter, an embodiment of a transport system for an object to be transported according to the present invention will be described with reference to the drawings.
FIG. 1 shows a wiring diagram in which various devices are connected by developing a transport system for a transported object. FIG. 2 shows a schematic diagram of a transport system for a transported object.
The electric power from the commercial power source 1 is drawn in by three three-phase three-wire electric wires 1A, 1B, 1C, and can drive various devices.

  A wiring breaker 2 is provided on the commercial power supply side (primary side) of the electric wires 1A, 1B, 1C, and an inverter 3 and an electromagnetic vibrator driven by the inverter 3 on the secondary side of the wiring breaker 2 The electromagnetic feeder 4 is connected.

The electromagnetic feeder 4 is a device that conveys the object to be conveyed by applying vibration to the object to be conveyed.
Specifically, as shown in FIG. 2, the electromagnetic feeder 4 includes a trough 4 </ b> A that conveys the object to be conveyed, and a drive body 4 </ b> B that has an electromagnet and a leaf spring as a vibration source. In the electromagnetic feeder 4, when the electromagnet is excited by the output current from the inverter 3, the trough 4 </ b> A is attracted to the lower rear side. Next, when the output current from the inverter 3 stops and the excitation of the electromagnet is released, the trough 4A is pushed back upward by the elastic force of the leaf spring. By repeating this operation, the object to be conveyed on the trough 4A is conveyed to the front side of the trough 4A.

  In the present embodiment, the resonance frequency of the electromagnetic feeder 4 is set to a frequency lower than 60 Hz that is the driving frequency of the electromagnetic feeder 4 from the stability of vibration. The frequency lower than 60 Hz can be set to any frequency as long as the amplitude of the electromagnetic feeder 4 does not greatly decrease. For example, the frequency is preferably set between 54 Hz and 59.9 Hz, and more preferably set between 58.2 Hz and 59.9 Hz.

  Three electric wires 5A, 5B, 5C are connected to the secondary side of the wiring breaker 2, and noise is passed through the second wiring breaker 6 to these electric wires 5A, 5B, 5C. A filter 7 is connected. The noise filter 7 has an effect of reducing radio noise (noise in a frequency band of 1 MHz or less).

  A zero-phase reactor 8 is connected to the output side of the noise filter 7. The zero-phase reactor 8 is effective in reducing noise for a frequency band of approximately 1 MHz or higher.

Further, the inverter 3 is connected to the output side of the zero-phase reactor 8.
Here, the inverter is generally a conversion device for converting direct current into alternating current. On the other hand, the converter is generally a conversion device for converting (rectifying) alternating current into direct current. However, with the development of power electronics in recent years, inverters use frequency converters as inverters to convert input AC voltage into target voltage and frequency and output AC voltage of desired frequency. It has come to be. That is, a frequency conversion device in which a converter circuit, an inverter circuit, a control circuit, and the like are incorporated is called an inverter. Although not shown in the figure, the inverter 3 in the present embodiment is a frequency converter, and thus includes a converter circuit, an inverter circuit, a control circuit, and the like.

  Further, as the method of the inverter 3, a PWM (pulse width modulation) method is used. This PWM type inverter divides the input DC voltage into a plurality of pulsed rectangular waves, and controls the number of these rectangular waves, the interval between adjacent rectangular waves, the width of each rectangular wave, etc. The target voltage and frequency can be output. The target frequency is the driving frequency of the electromagnetic feeder 4 and is set to 60 Hz. The target voltage is set to 220V.

  By passing through the inverter 3 having such a configuration, the input power supply is converted so that the frequency is 60 Hz and the voltage is 220 V, and is output from the two single-phase electric wires 9A and 9B. The output voltage passes through the zero-phase reactor 10 and then passes through the DC reactor 11. Then, the voltage is output to the electromagnetic feeder 4 to drive the electromagnetic feeder 4. Note that the maximum supply capacity capable of conveying coke, for example, by the electromagnetic feeder 4 driven at a driving frequency of 60 Hz and a voltage of 220 V is 200 t / hr (ton / hour). Incidentally, when the driving frequency is 50 Hz and the voltage is 200 V, the maximum supply capacity capable of conveying coke is 160 t / hr.

  The zero-phase reactor 10 is effective in reducing noise for a frequency band of approximately 1 MHz or higher. The DC reactor 11 is effective for suppressing radiation noise and induction noise, preventing insulation damage of the electromagnetic coil due to surge voltage, and reducing leakage current due to long-distance wiring.

  When the conveyance system for an object to be conveyed is driven in an area where the commercial frequency of the commercial power source 1 is 50 Hz, the input power source voltage is 60 Hz, which is higher than 50 Hz by the inverter 3. Then, the electromagnetic feeder 4 is driven by the converted voltage. Therefore, the conveyance capacity can be improved by setting the maximum supply capacity to 200 t / hr. Although the commercial frequency and voltage from the commercial power source may fluctuate, the frequency and voltage output from the inverter 3 are always maintained at predetermined values. Therefore, there is an advantage that the electromagnetic feeder 4 can be driven stably even in an area where the commercial frequency and voltage frequently change.

  Further, in the transport system for transported objects having the above configuration, the inverter 3 is often arranged at a position away from the electromagnetic feeder 4 by a predetermined distance. The distance is a distance exceeding 100 m, for example. Moreover, the distance from the commercial power source 1 to the inverter 3 is also a distance exceeding 100 m, for example. Thus, even when the wiring on the input side and the output side of the inverter is long, by providing the zero-phase reactors 8 and 10 on the input side and the output side as described above, for a frequency band of approximately 1 MHz or more. Thus, noise can be reduced. In addition, since the DC reactor 11 is disposed on the output side, it is possible to suppress radiation noise and induction noise, prevent damage to the insulation of the electromagnetic coil due to surge voltage, and reduce leakage current due to long-distance wiring. it can.

  The electromagnetic feeder 4 is provided with an amplitude detector 12 for detecting the actual amplitude when the electromagnetic feeder 4 is driven. The amplitude signal from the amplitude detector 12 is input to the inverter 3, and the input amplitude signal is output to the pair of output terminals 16 and 16. By connecting a display device such as a monitor to the pair of output terminals 16 and 16, the actual amplitude of the electromagnetic feeder 4 being driven can be confirmed.

  Further, reference numeral 15 shown in FIG. 1 denotes a pair of input terminals for inputting a signal capable of adjusting a driving current for driving the electromagnetic feeder 4 to the inverter 3. By connecting an input device such as a keyboard to these input terminals 15, 15, the drive current output from the inverter 3 to the electromagnetic feeder 4 can be adjusted to adjust the amplitude of the electromagnetic feeder 4.

  Further, a zero-phase reactor 13 is provided between the inverter 3 to which the signal from the amplitude detector 12 is input and the amplitude detector 12, and noise is generally applied to a frequency band of 1 MHz or more. It can be reduced.

  The zero-phase reactors 8, 10, and 13 are configured by winding a coil around an iron core four times, but the number of turns (number of turns) of the coil is not particularly limited.

  The electromagnetic feeder 4 is provided with a thermocouple 14 for measuring the temperature of the electromagnetic feeder 4. By providing the thermocouple 14, the temperature of the electromagnetic feeder 4 can be detected, particularly when the high-temperature coke discharged from the coke oven is transported, and the operating state of the electromagnetic feeder 4 can be grasped. There are advantages.

  The transport system for an object to be transported having the above configuration is particularly optimal when the transport distance is long and a large transport capability is required. For example, it is suitable for conveying limestone, iron ore, coke, chemical fertilizer, resin pellets and the like. It is also optimal when manufacturing foods. Here, when the electromagnetic feeder and the manufacturing equipment for producing food are mixed and arranged, the inverter cannot be arranged in a place where water or the like may be splashed. It is necessary to install in another place far away. Thus, when the wiring distance between an inverter and an electromagnetic feeder becomes long, it is preferable to arrange a zero-phase reactor or a DC reactor as described above. In addition, the said large conveyance capability shall point out the electromagnetic vibrator whose maximum supply capability which can convey coal, for example is 18 t / hr or more.

  In the present embodiment, the resonance frequency of the electromagnetic feeder 4 is set to 60 Hz, but any frequency may be used as long as the frequency exceeds 50 Hz. In particular, when a large amplitude is required, a preferable frequency is less than 100 Hz, and a more preferable frequency is 80 Hz or less.

  In the present embodiment, an electromagnetic feeder is used as the electromagnetic vibrator. However, a sliding conveyor using a linear motor or the like may be used as a driving unit of the vibrating conveyor or the vibrating conveyor.

  In this embodiment, the inverter 3 includes a converter circuit, an inverter circuit, a control circuit, and the like. However, the converter circuit, the inverter circuit, and the control circuit are provided independently and used by connecting them to each other. It may be configured to.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

It is the wiring diagram which expanded the conveyance system for to-be-conveyed objects, and connected various apparatuses. It is a side view of an electromagnetic feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Commercial power source, 1A, 1B, 1C ... Electric wire, 2, 6 ... Circuit breaker, 3 ... Inverter, 4 ... Electromagnetic feeder, 4A ... Trough, 4B ... Drive main body, 5A, 5B, 5C ... Electric wire, 7 ... Noise filter, 8, 10, 13 ... Zero phase reactor, 9A, 9B ... Electric wire, 11 ... DC reactor, 12 ... Amplitude detector, 14 ... Thermocouple, 15 ... Input terminal, 16 ... Output terminal

Claims (4)

  An electromagnetic vibrator for conveying the object to be conveyed by applying vibration to the object to be conveyed, and an inverter for converting the power frequency of the commercial power source to a frequency higher than 50 Hz and outputting the frequency to the electromagnetic vibrator, A conveyance system for an object to be conveyed, wherein a resonance frequency of the electromagnetic vibrator is set to a frequency lower than an output frequency of the inverter.   2. The transport system for a transported object according to claim 1, wherein the inverter is disposed at a position away from the electromagnetic vibrator by a predetermined distance, and a DC reactor is disposed on an output side of the inverter.   The transport system for transported objects according to claim 2, wherein a zero-phase reactor is disposed on the output side of the inverter.   The said zero-phase reactor is also arrange | positioned also at the input side of the said inverter, The conveyance system for to-be-conveyed objects of Claim 3 characterized by the above-mentioned.

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