JPH064290Y2 - Spark and temperature detector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spark / temperature detector for detecting generation of sparks and excessive temperature rise in a duct for pneumatically conveying raw cotton or the like separated into fibers.

2. Description of the Related Art In a blended cotton production process in a spinning factory, raw cotton is separated into fibers and pneumatically fed to remove impurities such as pebbles.

This separation / conveyance is performed by separating the raw cotton into fibers and sending the cotton feeding duct (1) by a fan (2) under pressure as shown in FIG.
A vertical separation duct (3) provided on the way separates pebbles and the like into a dust collection duct (4) by utilizing the weight difference. Further, a plurality of the dust collecting ducts (4) are connected to an underground pit (not shown) which is transported by wind pressure.

In the transport ducts such as the cotton feeding duct (1), the separating duct (3), the dust collecting duct (4) and the underground pit, the pebbles contained in the fibrous raw cotton transported at high speed are attached to the wall surface. A spark is generated because it hits at high speed. The raw cotton being conveyed is separated into fibers, spreads uniformly in the duct, and moves along with the air flow, so that it is in an extremely easy state of ignition. For this reason, when a spark is generated, a fire is likely to occur, and once the fire is generated, the raw cotton spreads on a high-speed air flow of several tens of meters per second, causing a great deal of damage. Therefore, a spark detector (5) using an optical sensor is arranged at several points on the wall surface of the duct,
When a spark is detected, the shutter (6) for partitioning the duct is closed at high speed to prevent the spread of fire.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-described conventional fire spread prevention system using the spark detector, the ignitability at the time of spark generation is greatly affected by the temperature in the duct. Therefore, when the temperature inside the duct becomes high, it is preferable to take a fire preventive measure such as introducing cooling air or carbon dioxide into the duct.

Further, when a fire occurs, the inside of the duct naturally becomes hot. Therefore, in addition to monitoring the spark, monitoring the temperature inside the duct also enhances the reliability of the fire spread prevention system.

For this reason, it is conceivable to attach other temperature detectors of the spark detector (5) to the ducts (1), (3) and (4). However, in this case, in order to detect the temperature inside the duct, it is necessary to make a hole in the duct and attach a temperature sensor, etc., and it is necessary to make electrical wiring separately from the spark detector, so installation costs are high, and inspection is required. There is also a problem that the management of such items becomes complicated.

Then, this invention makes it a solution subject to use the structure for attaching the spark detector to the duct as it is so that the installation of the temperature detector does not burden the construction cost.

Means for Solving the Problems The fireworks / temperature detector provided by the present invention is a case attached to the wall surface of a transfer duct for pneumatically feeding raw cotton and the like, and a case provided in the case and through a window plate of the case. An optical sensor and its amplifier for detecting the presence or absence of sparks in the transport duct, and a temperature sensor and its amplifier provided in the housing for detecting the temperature in the transport duct are provided.

Action The spark / temperature detector with the above-mentioned configuration is installed in a single housing, and the optical sensor and its amplifier, and the temperature sensor and its amplifier detect the generation of each spark and the temperature rise and output it. To do. Therefore, the spark detection and the temperature detection can be performed only by assembling one housing, the installation cost can be reduced, and the inspection and the like can be easily managed.

Embodiment An embodiment of the present invention will be described.

In FIG. 1, (9) is a transport duct, and the raw cotton or the like separated into fibrous form is placed on an air stream and pressure-fed. The transfer duct (9) is a general term for the above-described cotton transfer duct (1), separation duct (3), dust collection duct (4), underground pit, and the like.

Reference numeral (10) is a spark / temperature detector, which is integrally assembled with the housing (11) mounted on the wall surface of the transfer duct (9). (1
2) is a window plate provided on the front surface of the housing (11), which is made of a translucent material such as tempered glass and faces the inside of the transport duct (9). (13) is an optical sensor such as a phototransistor,
It is arranged so that the inside of the transfer duct (10) can be seen through the window plate (12). (14) is an amplifier of the optical sensor (13).
When the output of (13) exceeds a certain level, a spark detection output is generated. (15) is an adjusting volume for adjusting the sensitivity of spark detection, and (16) is a signal line of spark detection output. Further, (17) is a light emitting diode mounted facing the optical sensor (18), and when the test switch (18) is pressed, the optical sensor (13) is irradiated with light similar to an actual spark.

A temperature sensor (19) such as a thermistor attached to the window plate (12) detects the internal temperature of the transfer duct (9) through the window plate (13). Reference numeral (20) is an amplifier of the temperature sensor (19), which generates an alarm output of an abnormal temperature when its output exceeds a predetermined level. Reference numeral (21) is a temperature setting unit for setting the temperature at which this alarm is issued, and the set scale is set to be several degrees higher than the actual temperature in consideration of the temperature gradient in the window plate (12). (22) is a signal line for alarm output. Further, (23) is a heating element closely arranged to the temperature sensor (19), and when the test switch (18) is pressed, the temperature sensor (19) is heated to create the same state as when the exhaust duct is overheated.

The operation of the spark / temperature detector (10) having the above configuration is as follows.

First, the adjustment volume (15) and the temperature setting section (21) are operated to set the detection sensitivity of sparks and the temperature to be detected.

If the pebbles, etc., which are transported at high speed in the transport duct (9) hit the inner wall and generate a spark when operated in this state, the optical sensor
The ignition detection signal is sent to the signal line (1) by (13) and its amplifier (14).
It is output from 6). In addition, if the internal temperature of the transfer duct (9) rises above the set value due to an increase in outside air temperature, direct sunlight exposure to the transfer duct (9), etc., the temperature sensor (19) and its amplifier
The output of overheat detection is generated by (20) and is output from the signal line (22). The output of this overheat detection is also generated when the transfer duct (9) has a fire.

When the above detection is made, for example, the shutter (6) is closed by the ignition detection signal or cooling air or carbon dioxide gas is introduced into the transfer duct (9) by the overheat detection signal. The measures for the ignition detection signal and the overheat detection signal are not limited to this example. The point is to take appropriate measures to prevent fire and spread of fire.

This spark / temperature detector (10) has a test switch (1
By pressing 8), it is possible to confirm whether or not the spark detection and overheat detection operations are performed normally, which ensures reliability.

In the above embodiment, the temperature sensor (13) amplifier (14)
May have a function of outputting temperature data to an external temperature display section through a signal line (22). Further, the overheat detection signal may be generated in an external temperature display unit.

Effect of the Invention According to the present invention, since a temperature detecting function is added to the spark detector, it is possible to carry out fire prevention of a transport duct such as raw cotton in a more versatile manner than in the past and improve reliability.

In particular, since the spark detection circuit and the temperature detection circuit are assembled in one case, it is possible to reduce manufacturing costs, installation work costs, wiring costs, etc. as compared to the case where they are configured as separate devices.
The operation during use can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which a spark / temperature detector according to an embodiment of the present invention is attached to a conveying duct. FIG. 2 is a sectional view showing an example of the structure of the transport duct. (9) …… Transport duct, (10) …… Spark / temperature detector, (11) …… Housing, (12) …… Window plate, (13) …… Optical sensor, (14) …… Amplifier, (19) …… Temperature sensor, (20) …… Amplifier.

Claims (1)

[Scope of utility model registration request] 1. A housing attached to a wall surface of a transfer duct for pneumatically feeding raw cotton, and an optical sensor provided in the housing for detecting the presence or absence of sparks in the transfer duct through a window plate of the housing. A spark / temperature detector comprising: an amplifier thereof; a temperature sensor provided in the casing for detecting the temperature in the transfer duct; and an amplifier thereof.