JP4805431B2 - Sand level detector for fluidized bed equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous heat treatment apparatus for steel wire using a fluidized bed, and more particularly to detection of sand level in a fluidized bed apparatus.
[0002]
[Prior art]
The constant temperature transformation heat treatment of steel wire is conventionally performed using lead, but in recent years, fluidized bed patenting is being performed for fine wires due to the trend of environmental improvement. The heat treatment by the fluidized bed apparatus is performed by putting fine sand such as zircon and alumina into the fluidized bed apparatus, sending a pressurized gas from below, flowing and floating the sand, and passing the steel wire through the flowing and floating sand. If the pass line of the steel wire is not below the level of the sand, the steel wire will not contact the flowing sand and heat treatment cannot be performed normally.
[0003]
On the other hand, in the fluidized bed heat treatment, the level of sand is not constant because of the scattering of the fine particles and the outflow during the heat treatment, and in order to make the level constant, the flowing out sand is collected or new sand is added. Since the sand level in the fluidized bed varies in this way, the sand level must be detected in order to keep the sand level within a certain range.
[0004]
Conventionally, this sand level has been detected visually through a viewing hole provided in the fluidized bed apparatus. However, there is a problem that the sand level cannot be kept within a predetermined range because the grasping of the sand level by visual inspection is not always accurate. As a method for detecting the level of sand, a method for detecting the level of sand by providing an ultrasonic transmission device on the ceiling in the fluidized bed and detecting a signal reflected by the upper surface of the flowing sand by transmitting ultrasonic waves is known. However, there is a problem that the sand level cannot be accurately detected for sand floating and floating, and an expensive device is required.
[0005]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide an apparatus capable of detecting the level of sand flowing in a fluidized bed apparatus capable of detecting the level of sand in such a fluid medium easily and inexpensively.
[0006]
[Means for Solving the Problems]
The float that is placed inside the fluidized bed, the float that is placed inside the fluidized bed through which the steel wire to be heat-treated passes, A sand level detection device, wherein the fluidized bed device is provided with a guide pipe that leads from the inside of the fluidized bed device to the outside, and the specific gravity of the sand level detection device is smaller than the specific gravity of the fluidized floating sand. When the float is floating in the fluidized bed, the upper part has a weight shape and the lower part has a cylindrical shape, and the level display part has one end connected to the float and the other part connected to the guide tube. It is a sand level detecting device that passes through the fluidized bed apparatus and is guided and guided so that the sand level display portion can slide in one direction by a guide pipe.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Since the float of the sand level detection device can float above the flowing sand, the sand level detection device according to the present invention has a specific gravity smaller than that of the flowing sand.
In order to display the floating position floating in the fluidized bed outside the fluidized bed apparatus, one end of the sand level display unit is connected to the float, and the other end extends upward from the connection point and is located outside. The sand level display part is guided to be slidable up and down by passing a part of the sand level display part through the guide tube so that the position of the float in the layer corresponds to the position of the tip of the sand level display part.
[0008]
In order to prevent sand from accumulating in the upper part of the float while the float is floating in the fluidized bed and increasing the apparent specific gravity of the float, the float form of the present invention has a conical upper part when floated. Accumulation of sand can be prevented by adopting a pyramidal body shape.
[0009]
Furthermore, the sand level inside can be observed from the outside by providing a scale plate for measuring the position in the vicinity of the tip of the sand level display unit arranged outside the fluidized bed apparatus. Alternatively, a limiter for detecting the upper and lower limits of the sand level can be provided in the vicinity of the tip of the sand level display unit arranged outside the fluidized bed apparatus so that an alarm can be issued at the upper or lower limit of the sand level. .
[0010]
【Example】
This will be specifically described below with reference to the drawings.
In the figure, reference numeral 1 denotes a sand level detecting device according to the present invention. Reference numeral 1a denotes a floating steel plate having a hollow inside, a conical shape at the top and a cylindrical shape at the bottom. 1b was made with the steel wire in the display part. Reference numeral 2 denotes a guide tube, and a part of the display unit 1b is arranged with a gap. 3 is a scale plate for measuring the position of the tip of the display unit 1b, 4 is a sand level upper / lower limit detection limiter, 5 is flowing sand, 6 is a steel wire, 7 is a separation plate, and 8 is a chamber.
[0011]
The display unit 1b can extend from the floating sideways and can have one end disposed outside the fluidized bed apparatus. However, as shown in this embodiment, the display unit 1b extends upward and the end of the display unit is disposed outside the ceiling of the fluidized bed apparatus. By doing so, the sand level can be detected accurately and simply. A sand level can be specifically detected by arranging a scale plate for measuring the position in the vicinity of the tip of the sand level display unit 1b and reading the scale on the scale plate 3 at the tip of the display unit 1b. Also, with a limiter, an alarm can be issued when the sand level reaches the upper or lower limit. The specific gravity of the sand level detecting device is 1/5 of the specific gravity of the flowing sand in this embodiment.
In this embodiment, the position of the tip of the sand level display plate is visually observed to detect the sand level, and the sand is added. However, the position is detected electrically and the sand is automatically added by the signal. You can also do it.
[0012]
【The invention's effect】
As described above, the sand level detecting device in the fluidized bed apparatus according to the present invention can be produced easily and inexpensively, and can detect the sand level with high accuracy, so that the heat treatment in the fluidized bed is continued. Can be done properly.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a sand level detecting device according to the present invention.
DESCRIPTION OF SYMBOLS 1 ... Sand level detection apparatus 1a ... Floating 1b ... Display part 2 ... Induction tube 3 ... Scale plate 4 to measure ... Sand level upper / lower limit detection limiter 5 ... Flowing sand 6 ..Steel wire 7 ... separation plate 8 ... chamber

Claims (3)

A float placed inside a fluidized bed through which a steel wire to be heat treated passes,
A sand level detection device comprising: a sand level display part of sand, which is a fluid medium that floats and is placed inside a fluidized bed in a fluidized bed device;
The fluidized bed apparatus is provided with a guide pipe that leads from the inside of the fluidized bed apparatus to the outside.
The specific gravity of the sand level detector is smaller than the specific gravity of fluid floating sand,
As for the shape of the float, when the float is floating in the fluidized bed, the upper part is a weight shape, and the lower part is a cylindrical shape,
One end of the level indicator is connected to the float, the other end passes through the guide tube and extends outside the fluidized bed apparatus, and the sand level indicator is guided and guided by the guide tube so as to be slidable in one direction. A sand level detection device for a fluidized bed apparatus.   The sand level detection device for a fluidized bed apparatus according to claim 1, further comprising a scale plate in the vicinity of the end of the sand level display unit disposed outside the fluidized bed apparatus.   The flow according to claim 1 or 2, further comprising an upper limit / lower limit detection limiter in the vicinity of the end of the sand level display unit disposed outside the fluidized bed apparatus so that an alarm can be issued at the upper limit or the lower limit of the sand level. Sand level detection device for layer device.

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