CS240569B1 - Light ashes tracing photoelectric device - Google Patents

Abstract

The invention solves! measuring and signaling equipment suitable for connection to pneumatic separators particulate matter and serves as a control its separation capabilities. SUMMARY OF THE INVENTION is that photoelectric tracking device drift is a photoelectric sensor, amplifier, derivative circuit, the first and second evaluation circuits.

Description

(54) Photoelectric drift monitoring equipment

The invention provides a measuring and signaling device suitable for being connected downstream of pneumatic particle separators and for controlling its separation ability. The essence of the invention is that the photoelectric drift monitoring device comprises a photoelectric sensor, an amplifier, a derivative circuit, a first and a second evaluation circuit.

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BACKGROUND OF THE INVENTION The present invention relates to a photoelectric device for monitoring the drift of a cyclically operated pneumatic particle separator, in particular to control its separation ability and to facilitate the identification of a defective filter element.

Cyclically controlled pneumatic particle separators are commonly used in industrial practice, especially in chemical plants. For example, in dyeing production, these are so-called bag filters, which trap the leaking dye from the fluid driers into the textile sleeves and return them to the production cycle by regular tapping.

In case of loosening of the sleeve, its damage etc., there is an increased leakage of the dried product into the atmosphere, which results in both production losses and environmental hygiene in the vicinity of the object.

Existing separators are usually not equipped with a drift assessment device at all. If they have this device, they are universal devices that do not meet some special requirements of this issue, such as the requirement of simultaneous monitoring of clogging of optical parts of impurities and evaluation of drift size of processed product, etc. Usually photoelectric devices usually require or special optical equipment - reflective surfaces, lens system, etc. - to suppress such disturbing effects as fluctuations in luminous flux intensity, dust or other impurities depositing on the reflector sensor, etc. No. 194 517 must be a memory circuit and a timing member whose operation must be synchronized with the operation of the pneumatic separator by means of an external contact.

The above-mentioned disadvantages are eliminated by the photoelectric monitoring device according to the invention, which consists of a photoelectric sensor, an amplifier, a derivative circuit and a first and a second evaluation circuit, the principle being that the photoelectric sensor is connected to the input of the amplifier. the second evaluation circuit, the output of the derivation circuit being connected to the input of the first evaluation circuit.

The advantage of the photoelectric drift monitoring device according to the invention is that it does not require a second photoelectric sensor or auxiliary optics to compensate for variations caused by changes in luminous flux due to sensor dust, etc. It also allows separate evaluation of the degree of dust clogging on one side and the latter, each of which may be performed with a different sensitivity. The device is characterized by low maintenance, simple construction, especially in terms of its optical part, and thus easy to implement.

To illustrate the invention in greater detail, an exemplary embodiment of the invention is schematically illustrated in the accompanying drawing.

The luminous flux sensor 1 is connected to the input of the amplifier 2. To the output of this amplifier is connected both the input of the derivation circuit 3 and the input of the second evaluation circuit 4. The output of the derivation circuit 3 is connected to the input of the first evaluation circuit 5. advantage of using a passive RC element, possibly in conjunction with another amplifier. The first evaluation circuit can be realized, for example, by means of a pointing controller with an adjustable hand position sensing. The second evaluation circuit may take the form of an analog signal comparator with an optical output. The luminous flux source 11 is located on the opposite side of the measuring chamber 7 so that the photoelectric sensor 1 lies in its optical axis.

The photoelectric sensor 1 senses the instantaneous value of the luminous flux in the measuring chamber 7. Its signal is amplified by the amplifier 2 and is applied both to the input of the differentiating circuit 3 and to the input of the second evaluation circuit 4. the chamber 7, caused by the changing drift in the monitored space, is brought to the input of the second evaluation circuit 5.

Thus, a signal containing information on the degree of clogging of the optical path by dust or other impurities is permanently applied to the input of the second evaluation circuit. The first evaluation circuit, opposite the flow, processes a signal the magnitude of which is proportional to the increment of the material drift due to the tapping of the sleeve.

Claims (1)

SUBJECT Photoelectric drift monitoring device consisting of a photoelectric sensor, an amplifier, a derivation circuit and a first and a second evaluation circuit, characterized in that the photoelectric sensor (1) is connected to an amplifier input (2) whose output is connected to the derivative circuit input (2). 3J and on the other hand the input of the second evaluation circuit (4), the output of the derivative circuit (3) being connected to the input of the first evaluation circuit (5). 1 sheet of drawings