JPS6116697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a garbage level meter for a garbage incinerator.

Traditionally, garbage incinerators (hereinafter simply referred to as incinerators)
The amount of garbage charged in the incinerator that is cut out into the grate is controlled by measuring the level of garbage in the incinerator with a level meter equipped with an ultrasonic transducer installed above the garbage input hopper. was.

However, the level of garbage in the incinerator does not always change depending on the amount of garbage removed. That is, as shown in FIG. 1, when garbage is inputted, the level of garbage 3 which is biased toward the garbage input hopper 2 side of the garbage incinerator 1 is measured by the garbage level meter 4 while being cut out. Level meter 4 may collapse on top of the garbage 3' or change in the surface shape of the garbage.
If the ultrasonic waves from the ultrasonic transducer are diffusely reflected, as shown by the solid line in Figure 2, the garbage is cut out and the actual garbage level is Even though the dust level is decreasing, the dust level meter 4 outputs a dust level signal indicating that the dust level has increased. As a result, a garbage cutting command is issued to the garbage cutting amount control device (not shown) that controls the garbage cutting amount, and as a result, more garbage than the normal amount of garbage is cut out, and the incinerator is cut out. Automatic control will not be performed properly.

The present invention provides a garbage level meter to solve the above problem, and the present invention provides a garbage level meter that measures the amount of garbage that is intermittently put into the hopper of the incinerator in order to control the amount of garbage cut into the incinerator. In a garbage level meter for measuring the level of an ultrasonic transducer, two time constants with different time constants are connected in parallel to the output terminal of a converter for converting an ultrasonic signal from an ultrasonic transducer into an electric signal. It consists of a constant circuit, a changeover switch connected between the two time constant circuits and the level meter, and a control device for operating the changeover switch. When the difference between the output signals from the time constant circuits is larger than the set value, the switching is performed so that the signal from the time constant circuit with the smaller time constant among the two time constant circuits is output to the level meter. On the other hand, when the difference between the output signals is smaller than the set value, the signal from the time constant circuit with the larger time constant of the two time constant circuits is output to the level meter. It is characterized in that it has the function of switching the changeover switch.

The present invention will be described by way of examples with reference to the drawings.

FIG. 3 is a schematic diagram of the construction of the dust level meter of the present invention.

In the figure, 5 is an ultrasonic transducer installed above the garbage input hopper of the garbage incinerator, and 6 is a converter connected to the ultrasonic transducer 5, which converts the ultrasonic signal into an electrical signal. It is something to do. 7,8
are two time constant circuits connected in parallel to the output terminal of the converter 6, and the time constant of the time constant circuit 7 is smaller than the time constant of the time constant circuit 8. 9
is a changeover switch connected to the output terminals of the time constant circuits 7 and 8, and the output terminal of either the time constant circuits 7 or 8 is connected to the output terminal 15 of the level meter by a relay of the control device, which will be described later. It automatically switches to That is, when garbage is thrown into the garbage input hopper, the time constant circuit 7 with a small time constant, that is, has a fast response, is used, whereas when garbage is removed, the time constant circuit 8, which has a large time constant, that is, a slow response is used. It is a switch to the side. 10 is a control device, which includes a differential amplifier 11 connected to the output terminals of the time constant circuits 7 and 8, a comparator 12 connected to the output terminal of the differential amplifier 11, and a control device connected to the output terminal of the comparator 12. It is composed of a connected relay 13.

With this configuration, when the signals from the time constant circuits 7 and 8 are input to the differential amplifier 11, a signal corresponding to the difference between the two signals is outputted, and this difference signal is sent to the comparator 12. is input. In the comparator 12, the difference signal and the presetting device 1
4 is compared with the set value ΔH of the dust level, and only when this difference signal exceeds the set value ΔH, a signal is output to the relay 13, which is normally connected to the time constant circuit 8 side. The switch 9 is switched to the time constant circuit 7 side by the relay 13. Incidentally, as shown in FIG. 2, the above-mentioned ΔH is the garbage level at the time of inputting the garbage, and this is larger than the level change ΔH' due to crumbling of the garbage or change in the surface shape of the garbage. As a result, the cutting amount control device (not shown) connected to the output end of the changeover switch 9 is not affected by the crumbling of the trash or changes in the surface shape of the trash, as shown by the dotted line in FIG. A garbage level signal that does not exist, that is, a garbage level signal that rises sharply only when garbage is input and falls smoothly from the time garbage is input to the next garbage input, is output, and the cutting amount control device is output based on this garbage level signal. controlled.

As described above, according to the present invention, a garbage level signal that is not affected by crumbling of the garbage or changes in the surface shape of the garbage is output, so that accurate garbage cutting according to the garbage level can be performed, resulting in good incineration. The ability to automatically control the furnace has extremely useful effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the second part of the garbage incinerator, FIG. 2 is a diagram showing temporal changes in the garbage level, and FIG. 3 is a schematic diagram of the construction of the garbage level meter of the present invention. In the drawing, 1... Garbage incinerator, 2... Garbage input hopper,
3... Garbage, 4... Dust level meter, 5... Ultrasonic transducer, 6... Converter, 7, 8... Time constant circuit, 9... Changeover switch, 10... Control device, 1
1... Differential amplifier, 12... Comparator, 13... Relay, 14... Setting device, 15... Output end.

Claims (1)

[Scope of Claims] 1. A garbage level meter for measuring the level of garbage intermittently put into a hopper of the incinerator in order to control the amount of garbage cut into the incinerator, comprising: two time constant circuits with different time constants connected in parallel to the output terminal of the converter for converting the ultrasonic signal from the wave transducer into an electric signal; and the two time constant circuits and the level meter. a changeover switch connected between the changeover switch and a control device for operating the changeover switch; Sometimes, the changeover switch is changed so that the signal from the time constant circuit with a smaller time constant out of the two time constant circuits is output to the level meter, while the difference between the output signals is determined by the setting. When the time constant circuit is smaller than the above value, the changeover switch is operated so that a signal from the time constant circuit having a larger time constant among the two time constant circuits is outputted to the level meter. Garbage level meter for incinerator.