JP2002167041A - Dust collector operating method and dust collector control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector operating method and a dust collector control device capable of efficiently separating the powder and granular material without shortening the service life of a filter and capable of effectively cooling the powder and granular material by adjusting the working air flow in consideration of pressure resistance and heat resistance of the filter. SOLUTION: A pressure difference meter 21 measures a pressure difference between this side and that side of a filer 20 of a dust collector 15 for separating the powder and granular material 13 carried by the carrying air, and a temperature meter 22 measures a temperature inside the dust collector 15, and the processing air flow of the dust collector 15 is adjusted to lower the pressure difference and the temperature to the predetermined values or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation method and a control device for a dust collector, and more particularly to a method for conveying powders and granules conveyed by air for conveyance, particularly powders and granules formed by pulverization by a pulverizer. The present invention relates to an operation method of a dust collector for separating air from working air and a control device thereof.

[0002]

2. Description of the Related Art As means for transporting powders and granules, the powders and particles are transported together with the transport air to a destination, and separated at the destination by a dust collector. Have been done. At this time, in the dust collector, the differential pressure changes with time due to clogging of the filter, and if the differential pressure increases, the life of the filter is shortened, and the filter may be damaged. It is necessary to adjust the processing air volume of the dust collector. For example, when the filter is of the filter cloth type, the life until the filter is torn or broken is short, and when the filter is of the sintered type, the life until the filter is broken or broken is short.

[0003] In addition, when the temperature of the granular material rises due to frictional heat during transportation, and when the granular material composed of the pulverized material pulverized by the pulverizer is transported, the pulverized material is pulverized by the pulverizer. , The high temperature powder and air flow into the dust collector. If such high-temperature particles or air flows into the dust collector and exceeds the allowable temperature limit of the filter, the life of the filter will be shortened. I need to lower it.

[0004]

However, in the conventional dust collector, since the processing air volume is manually adjusted, the air volume must be adjusted frequently in accordance with the temporal change of the differential pressure. In addition, when cooling the granular material, it is operated at a temperature much lower than the heat resistant temperature of the filter in anticipation of changes in the temperature during the season and day and night, so the processing air volume of the dust collector increases and the differential pressure increases. It will be easier. At this time, it is possible to manually adjust the processing air volume according to a change in the temperature, but this is not realistic because it requires a great deal of labor.

[0005] Therefore, the present invention can efficiently separate the powder and granules while extending the life of the filter by adjusting the amount of treatment air in consideration of the pressure resistance and heat resistance of the filter. It is an object of the present invention to provide a method of operating a dust collector and a control device of the dust collector, which can also effectively cool particles.

[0006]

In order to achieve the above object, a method for operating a dust collector according to the present invention is a method for operating a dust collector which separates carrier air from powder and particles conveyed by the carrier air. Measuring the pressure difference before and after the filter of the dust collector and measuring the temperature inside the dust collector, and adjusting the processing air volume of the dust collector so that the measured differential pressure and the temperature are respectively equal to or less than predetermined values. The adjustment of the processing air volume is performed by adjusting the rotation speed of a blower that sucks the carrier air separated by the dust collector, or by adjusting the flow rate of a path through which the carrier air separated by the dust collector flows. Features.

The control device for a dust collector according to the present invention is a control device for a dust collector which separates a carrier air and a granular material carried by the carrier air. A controller comprising a differential pressure gauge for measuring, and a thermometer for measuring the temperature inside the dust collector, and a controller for adjusting the processing air volume of the dust collector so that the measured value of the differential pressure gauge and the measured value of the thermometer are respectively equal to or less than predetermined values. The adjustment of the air volume by the controller, the rotation speed control unit that controls the rotation speed of the blower that sucks the carrier air separated by the dust collector, or the carrier air separated by the dust collector. The flow rate is controlled by a flow rate control unit that controls the flow rate of a flowing path.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram showing an embodiment in which the present invention is applied to a synthetic resin pulverizing facility. First, the pulverizing equipment includes a pulverizer 12 for pulverizing the material 11 to be pulverized, a transport path 14 for transporting the pulverized material (pulverized material) 13 by transport air, and a pulverized material 13 from the transport air. A dust collector 15 for separation, a blower 17 for sucking the carrier air separated by the dust collector 15 through a suction path 16, and a rotary valve 18 for dropping the crushed material 13 separated by the dust collector 15 in a state where the ventilation is shut off, and , The rotary valve 1
8 and a collection container 19 for the crushed material 13 attached below.

In the control device of this embodiment, the dust collector 15
A differential pressure gauge 21 for measuring a differential pressure before and after a filter (filter material) 20 provided in the dust collector 15, a thermometer 22 for measuring a temperature inside the dust collector 15, The differential pressure measured by the differential pressure gauge 21 and the thermometer 2
A controller (controller) 23 for adjusting the processing air volume of the dust collector 15 based on the temperature measured in Step 2.

The control unit for adjusting the processing air volume of the dust collector 15 can employ an appropriate system.
The rotation speed control unit that controls the rotation speed of the blower 17 includes:
An electric motor 17a for driving the blower 17 is controlled by an inverter 17b, and a signal from the controller 23 is used to control the number of revolutions of the electric motor 17a via the inverter 17b. As a flow control unit for controlling the flow rate of the path through which the conveying air flows, a damper 16a provided in the suction path 16 is formed so as to be opened and closed by an electric motor 16b. By controlling the angle of the damper 16a by operating the electric motor 16b in response to a signal from the controller, a method of adjusting the flow rate of the carrier air flowing in the suction path 16 can be adopted, and automation, controllability, economy, etc. Either of these is preferable from the viewpoint of.

Further, in the present embodiment, an air thermometer 24 for measuring the temperature of the intake air of the granular material is provided at the inlet 12a of the crusher 12, and the measured temperature of the air thermometer 24 is also taken into the controller 23. Like that.

In such a crushing equipment, the allowable maximum differential pressure and the allowable maximum temperature are respectively determined from the pressure resistance performance and the heat resistance performance of the filter 20 in the dust collector 15, and the diameter and path length of the transport path 14 and the size of the crushed material 13 are determined. The minimum flow rate of the transfer air is determined by the specific gravity and the like, and the differential pressure setting value, the temperature setting value, and the flow rate setting value are set based on these values.

In the filter 20, it is preferable that the differential pressure during operation is as small as possible and the temperature is low. However, if the processing air volume is reduced in order to reduce the differential pressure, the pulverized material 13 can be cooled sufficiently. If the processing air volume is increased in order to lower the temperature, the differential pressure will increase.

For example, the differential pressure set value of the filter 20 is set to 3
When the kPa and the temperature set value were 70 ° C., the differential pressure gauge 21,
The grinding equipment is operated while monitoring the measured values of the thermometer 22 and the air thermometer 24 with the controller 23, and the processing air volume is adjusted according to the measured values of the differential pressure gauge and the thermometer. That is, if the differential pressure measured by the differential pressure gauge 21 exceeds 3 kPa, the processing air flow is reduced to reduce the differential pressure, and if the temperature measured by the thermometer 22 exceeds 70 ° C., the processing air flow is increased. As a result, the cooling effect of the carrier air is increased.

Further, if the temperature measured by the thermometer 22 is 70
When the temperature is sufficiently lower than 0 ° C., the processing air volume is further reduced, and the filter 20 is operated in a state in which the differential pressure is as small as possible. When the inverter 17 is controlled by an inverter, the power consumption can be reduced.

The temperature measured by the thermometer 22 is constant,
For example, by adjusting the processing air flow so as to maintain 60 ° C., the pulverized material 13 collected in the collection container 19 can be cooled to a certain temperature, and for example, thermal degradation and deterioration of the synthetic resin can be prevented. At this time, by measuring the temperature of the intake air with the air thermometer 24, it is possible to more quickly adjust the processing air volume with respect to fluctuations in the atmospheric temperature due to day and night or changes in weather.

As described above, the processing air volume is adjusted based on the measured differential pressure and the measured temperature, and the filter 20 is operated such that the differential pressure and the temperature in the filter 20 become equal to or less than predetermined values. Stable separation operation (filtration treatment) for a long time, regardless of whether it is a sintered type
Can be continued. Further, by adjusting the processing air flow according to the measurement temperature, the temperature of the crushed material 13 separated and collected from the carrier air by the dust collector 15 can be cooled to a constant temperature or a predetermined temperature or less.
3 can be prevented from being thermally degraded.

Further, by constantly monitoring the differential pressure,
It is possible to reliably cope with an increase in the differential pressure due to the temporal change of the filter 20, and not only can the maintenance and replacement time of the filter 20 be easily known according to the state of the increase in the differential pressure, but also the damage of the filter 20 can be reduced. The pressure can be reliably detected by the sudden decrease in pressure.

Although the present embodiment has been described by exemplifying a dust collector installed in a pulverizing facility, the present invention can be similarly applied to a dust collector of a transport facility for transporting a raw material resin to an extruder or an injection molding machine. In addition, the present invention can be applied to a dust collector that separates various powders and particles conveyed by air with various filters.

[0020]

As described above, according to the present invention,
Since the dust collector can be operated under optimum conditions, the service life of the filter can be extended. In addition, the temperature of the powders separated and collected by the dust collector can be easily controlled, and it is particularly suitable for the dust collector for separating and collecting the pulverized material pulverized by the pulverizer.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment in which the present invention is applied to a synthetic resin pulverizing facility.

[Description of Signs] 11: object to be crushed, 12: crusher, 13: crushed material, 14 ...
Conveyance path, 15: dust collector, 16: suction path, 16a: damper, 16b: electric motor, 17: blower, 17a: electric motor, 17b: inverter, 18: rotary valve,
19: collection container, 20: filter, 21: differential pressure gauge, 2
2: thermometer, 23: controller, 24: air thermometer

Claims (4)

[Claims] 1. A method for operating a dust collector for separating a carrier air and a granular material carried by the carrier air, wherein a differential pressure across a filter of the dust collector is measured and a temperature in the dust collector is measured. A method of operating a dust collector, comprising: measuring and measuring a processing air volume of the dust collector so that the measured differential pressure and the measured temperature are each equal to or less than a predetermined value. 2. The process air volume is adjusted by adjusting the number of revolutions of a blower that sucks the carrier air separated by the dust collector, or by adjusting the flow rate of the passage of the carrier air separated by the dust collector. The method for operating a dust collector according to claim 1, wherein the method is performed. 3. A control device for a dust collector for separating a conveying air and a powder and a granular material conveyed by the conveying air, wherein the differential pressure gauge measures a differential pressure across a filter of the dust collector.
With a thermometer that measures the temperature inside the dust collector,
A control device for a dust collector, comprising: a controller that adjusts a processing air volume of the dust collector so that a measured value of a differential pressure gauge and a measured value of a thermometer are each equal to or less than a predetermined value. 4. The controller according to claim 1, wherein the controller controls a rotation speed of a blower that sucks the carrier air separated by the dust collector, or a flow rate that controls a flow rate of a passage of the carrier air separated by the dust collector. The control device for a dust collector according to claim 3, further comprising a control unit.