JPH0682439A - Waste plastic discriminating device - Google Patents

Abstract

PURPOSE:To provide a waste plastic discriminating device which, even if gas detectors each require a long response recovery time, can eliminate this effect and determine continuously at a high speed whether or not a waste plastic is vinyl chloride. CONSTITUTION:This waste plastic discriminating device includes a probe l for collecting gas generated from waste plastic, a plurality of gas detectors 5A, 5B, 5N for determining whether or not the gas contains materials composing vinyl chlorides, a gas switch 3 disposed between the probe 1 and each gas detector 5A,5B,5B, a probe side gas introducing passage 2, a plurality of detector side gas introducing passages 4A, 4B, 4N and a switching signal generator 7. At the gas switch 3, when the gas concentrations in the previously selected gas detectors 5A, 5B reach a level at which detection is possible and so measurement becomes possible, the detector side gas introducing passages 4B, 4N of the other gas detectors 5B, 5N are connected to the probe side gas introducing passage 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention determines that waste plastic is vinyl chloride by determining whether or not the gas generated from the heated waste plastic contains vinyl chloride composition substances such as hydrogen chloride and chlorine. The present invention relates to a waste plastic identifying device for identifying whether or not

[0002]

2. Description of the Related Art Conventionally, as a waste plastic identification device of this kind, a probe for collecting gas generated from heated waste plastic and a gas detector for judging whether or not chlorine is contained in this gas. And a gas introduction path for sending gas from the probe to the gas detector are known.

[0003]

In the above-mentioned conventional waste plastic identifying device, it is necessary to use a highly sensitive chlorine gas detector in the case of determining whether or not chlorine or the like is contained in the low concentration gas. However, with such a high-sensitivity detector, the detector continues to output a signal as if the gas still existed even after the gas disappeared, so the response recovery until the next measurement was possible. The problem was that it took a long time.

The object of the present invention is to eliminate the influence of a long response recovery time of the gas detector even when the response recovery time of each gas detector is long, and the waste plastic is vinyl chloride at high speed and continuously. It is to provide a waste plastic identification device capable of identifying whether or not it is.

[0005]

A waste plastic identification device according to the present invention includes a probe for collecting gas generated from heated waste plastic and a vinyl chloride composition substance such as hydrogen chloride or chlorine contained in the gas. A plurality of gas detectors to determine whether or not, a gas switcher arranged between the probe and the gas detector, a probe-side gas introduction path for sending gas from the probe to the gas switcher,
Gas switching is equipped with a plurality of detector-side gas introduction paths that send gas from the gas switch to each gas detector, and a switching signal generator that receives the detection signal of each gas detector and sends a switching signal to the gas switch. In the gas detector, when the gas concentration in the previously selected gas detector reaches the detectable level and measurement becomes possible, the gas from the detector side of another gas detector is introduced by the signal from the switching signal generator. The passage is connected to the gas introduction passage on the probe side.

[0006]

The waste plastic identification device according to the present invention determines a probe for collecting gas generated from heated waste plastic and whether or not the gas contains vinyl chloride composition substances such as hydrogen chloride and chlorine. Multiple gas detectors, a gas switcher placed between the probe and the gas detector, a probe-side gas introduction path that sends gas from the probe to the gas switcher, and from the gas switcher to each gas detector A plurality of detector side gas introduction paths for sending gas,
The gas switching device is provided with a switching signal generator that receives a detection signal from each gas detector and sends a switching signal to the gas switching device.In the gas switching device, the gas concentration in the previously selected gas detector reaches a detectable level. When it becomes possible to measure, the signal from the switching signal generator is connected to the gas introduction path on the detector side of another gas detector on the gas introduction path on the probe side. When the gas concentration in the selected detector reaches the detectable level and measurement becomes possible, another gas detector that is ready for measurement is connected to the probe. Therefore, even if the previously selected gas detector is within the response recovery time and continuous measurement is not possible, the newly connected gas detector is ready for immediate measurement. The next measurement can be performed without waiting for the response recovery time of the gas detector selected in.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a waste plastic identifying apparatus of the present invention, which is a probe for collecting gas generated from heated waste plastic.
(1) and a plurality of gas detectors (5A) (5B) (5N) that determine whether this gas contains vinyl chloride composition substances such as hydrogen chloride and chlorine, and from the probe (1) The probe-side gas introduction path (2), which serves as a passage for the sent gas, and the probe
(1) and the gas detectors (5A) (5B) (5N), the gas switch (3), and the passage of the gas sent to each gas detector (5A) (5B) (5N) A plurality of detector side gas introduction paths (4) and
Switching signal generator that receives the detection signal of each gas detector (5A) (5B) (5N) and sends a switching signal to the gas switching device (3)
(7) and a detection signal switcher (6) that receives the detection signals of the gas detectors (5A) (5B) (5N) and generates a judgment output signal. And, as will be described later, a gas switching device
In (3), when the gas concentration in the previously selected gas detector (5A) (5B) reaches the detectable level and measurement becomes possible, the switching signal generator (7) detects another gas. Bowl (5B) (5
The detector side gas introduction passages (4B) and (4N) of N) are connected to the probe side gas introduction passage (2).

Here, the gas detectors (5A) (5B) (5N) and the detector-side gas introduction path (4) are provided with the response recovery time of each gas detector (5A) (5B) (5N) and this device. The optimum quantity is set in consideration of the detection throughput required for

FIG. 2 shows a time chart of various signals when there are three gas detectors (5A) (5B) (5N).

Gas switching device (3) and detection signal switching device
(6) is the same gas detector (5A) in the initial state, for example, the first
The gas detector (5A) is selected.

In this state, when the waste plastic is heated in the probe (1) to generate a gas, the gas is introduced into the probe-side gas introduction path (2), the gas switching device (3), and the first detector-side gas introduction. The first gas detector (5A) is reached through the path (4A).

When the waste plastic is vinyl chloride, the first gas detector (5A) reacts with the composition contained in the gas generated from the waste plastic, and a detection signal corresponding to its concentration is generated.

A1 in FIG. 2 shows the gas concentration in the first gas detector (5A), and B1 in FIG. 2 shows the gas detectable level of the first gas detector (5A). (1)
Contacting the plastic with the plastic, the gas concentration A in the first gas detector (5A) begins to increase, and at time t1, the first gas detector (5A)
The gas concentration A1 in A) becomes equal to or higher than the gas detectable level B1 of the first gas detector (5A).

S1 in FIG. 2 represents a gas detection signal of the first gas detector (5A), and the gas concentration A1 in the first gas detector (5A) is the gas of the first gas detector (5A). Detectable level B
When it is greater than 1, an ON signal is output, and this is input to the switching signal generator (7).

Even if the gas disappears, the first gas detector (5A) itself requires a response recovery time.
As shown in FIG. 2A1, the detection output of (5A) takes much longer to fall than to rise. Then, if the detection output is above a certain level, the determination output is maintained in the ON state, so that it is a very wide signal (t4-t1) as shown in FIG. 2S1. The first gas detector (5A) is
The gas concentration A1 in the first gas detector (5A) is the first gas detector.
Since the ON signal continues to be output until time t4 when the level becomes lower than the gas detectable level B1 of (5A), when the number of gas detectors is only one of the first gas detectors (5A), the next signal is passed until time t4. Will not be able to be measured.

The switching signal generator (7) receives the output of the detection signal and constantly monitors the state. here,
When the on level is detected, a switching signal is generated after a very short time. Switching signal is gas switch
It is supplied to both (3) and the detection signal switch (6), and this signal drives the gas switch (3), and the next gas detector (5B), for example, the second gas detector (5B) The detector-side gas introduction passage (4B) is connected to the probe-side gas introduction passage (2). No gas is flowing into the newly selected gas detector (5B), so the decision output is off, where
The judgment output that has passed through the detection signal switcher (6) becomes a pulse with a short ON section.

After the second gas detector (5B) outputs the ON determination output, the next gas detector (5N), for example, the third gas detector (5N), is generated by the signal from the switching signal generator (7). The detector-side gas introduction passage (4N) is connected to the probe-side gas introduction passage (2).

A2 and A3 in FIG. 2 represent the gas concentrations in the second and third gas detectors (5B) and (5N), respectively.
2 and B3 are the second and third gas detectors (5
B) The gas detectable level of (5N) is set to S2 and S3 in FIG.
Are gas detection signals output from the second and third gas detectors (5B) and (5N), respectively. The response recovery time of the second gas detector (5B) is (t5-t2) and the response recovery time of the third gas detector (5N) is (t6-t3), both of which are very wide signals. Has become.

SO in FIG. 2 shows the judgment output that has passed through the detection signal switch (6), whereby the judgment output SO is decomposed into short pulses and the individual detectors (5A) (5B) are separated.
It can be seen that the next measurement can be performed at intervals shorter than the response recovery time of (5N).

[0021]

According to the waste plastic identifying apparatus of the present invention, when the gas concentration in the detector previously selected and connected to the probe reaches the detectable level and becomes measurable, the gas switching device is used. , Since the gas detector that is in a state where another measurement can be performed is connected to the probe, even if the gas detector selected previously is within the response recovery time and the next measurement cannot be performed, The connected gas detector is ready for measurement, and the next measurement can be performed without waiting for the response recovery time of the previously selected gas detector. That is, even if the response recovery time of each detector is long, it is possible to eliminate the effect that the response recovery time of the gas detector is long and identify whether the waste plastic is vinyl chloride at high speed and continuously. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a waste plastic identification device according to the present invention.

FIG. 2 is a time chart showing changes in various signals in the waste plastic identification device according to the present invention.

[Explanation of symbols]

 (1) Probe (2) Probe side gas introduction path (3) Gas switch (4A) (4B) (4N) Detector side gas introduction path (5A) (5B) (5N) Gas detector (7) Switching signal Generator

Claims (1)

[Claims] 1. A probe (1) for collecting gas generated from heated waste plastic, and a plurality of gases for judging whether or not the gas contains vinyl chloride composition substances such as hydrogen chloride and chlorine. Detector (5A) (5B) (5N) and probe
(1) and the gas detectors (5A) (5B) (5N) placed between the gas switch (3) and the probe (1) to the gas switch
(3) probe-side gas introduction passage for sending gas to (3), and multiple detector-side gas introduction passages for sending gas from gas switch (3) to each gas detector (5A) (5B) (5N) 4A) (4B) (4N) and a switching signal generator (7) that sends the switching signal to the gas switching device (3) in response to the detection signal of each gas detector (5A) (5B) (5N) , In the gas switch (3), when the gas concentration in the previously selected gas detector (5A) (5B) reaches the detectable level and measurement becomes possible, the switching signal generator
The signal from (7) is connected to the gas introduction passage (4B) (4N) on the detector side of another gas detector (5B) (5N) to the gas introduction passage (2) on the probe side. Plastic identification device.