JPH08278248A - Measuring window mechanism for moisture content measuring device at powder and bulk solid treatment apparatus - Google Patents

Abstract

PURPOSE: To provide a measuring window mechanism, for a moisture content measuring device at a powder and bulk solid treatment apparatus, in which a peculiar region is not formed in a flow state and a heat state inside the powder and bulk solid treatment apparatus around a measuring part and which prevents a powder and bulk solid from being stuck to a measuring window and a trouble from occurring in a measurement. CONSTITUTION: In a measuring window mechanism for a moisture content measuring device at a powder and bulk solid treatment apparatus, a measuring opening 2 which allows measuring light to come in and out is formed at a treatment-container wall body 1. A glass drum 6 which allows the transmission of the measuring light is installed at the measuring opening 2 so as to cover the opening 2, and the glass drum 6 can be slid so as to come into contact with the peripheral edge of the measuring opening 2. A fluorocarbon frame body 5 which acts as a wiper with reference to the circumferential face of the glass drum 6 when the glass drum 6 is turned so as to be slid on its peripheral edge is installed at the peripheral edge of the measuring opening 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the drying, granulating,
In a powdery or granular material processing device that performs mixing, heat treatment, etc., a water content measuring device that optically detects the water content of the powdery or granular material by irradiating the powdery or granular material in the processing container with measurement light in a non-contact manner. More particularly, the present invention relates to a measurement window mechanism having a measurement window contamination prevention mechanism for irradiating the measurement light.

[0002]

2. Description of the Related Art When a granular material processing device, for example, a fluidized bed processing device is used to perform processing such as granulation, drying, coating, etc., the granular material containing water flows. It is flowing while being blown up by hot air in the room, and in order to bring the moisture content of this powder and granules to the desired moisture content, the moisture content measurement device is used to optically measure the moisture content continuously in a non-contact state. Known to do. In this optical moisture measurement, infrared rays are radiated to the granular material flowing in the room through a measurement light window provided on the side wall of the flow chamber, and the absorption of light by the moisture is measured from the reflected light. The water content can be measured.

However, in the above-described measurement environment, powder particles that contain water and flow adhere to the measurement window, which hinders accurate water measurement. As a mechanism for preventing the measurement window from being soiled, for example, Japanese Patent Laid-Open No. 62-
Those disclosed in Japanese Patent No. 52435 and Japanese Utility Model Publication No. 6-21010 are known.

In Japanese Unexamined Patent Publication No. 62-52435, a detection cylinder is provided on the side of the flow chamber so as to be recessed from the flow chamber, and a measurement window of an infrared moisture meter is arranged in the back of the detection cylinder. A structure is disclosed in which, by blowing out purge air from the detection cylinder, it is possible to prevent the granular material from flowing into the detection cylinder from the flow chamber, and as a result, it is possible to prevent dirt from adhering to the measurement window.

In Japanese Utility Model Publication No. 6-21010,
The measurement light is guided into the flow chamber by an optical fiber, and a hot air supply pipe is arranged around this optical fiber to blow hot air toward the tip of the fiber to prevent the powder in the fluidized bed from adhering to the tip of the fiber. A mechanism is disclosed.

In the above-mentioned two conventional techniques, even if there is a difference in the flow rate of the air flow to be jetted, in both cases, the air flow is used to prevent the particles from adhering to the measurement window or the tip of the optical fiber. It is a thing. Such a blown air flow disturbs the fluidized state of the fluidized bed, or when hot air is used, locally forms a nonuniform heat state in the fluidized bed. These become elements that disturb the uniform state of the granular material in the fluidized bed, and there is a possibility that a peculiar region of the granular material state is generated especially around the measurement site.
Therefore, the measured value may be unstable or inaccurate.

The present invention has been devised in order to effectively solve the above-mentioned conventional technical problems.
Therefore, the object of the present invention is to support the measurement without forming a peculiar region in the flow state or the heat state in the powder or granular material processing apparatus around the measurement site and the powder or granular material is attached to the measurement window. Another object of the present invention is to provide a measurement window mechanism for a water content measuring device of a powdery or granular material processing device capable of preventing the above.

[0008]

A measuring window mechanism for a moisture measuring device of a powdery or granular material treating apparatus according to the present invention has the following features in order to solve the above-mentioned problems of the prior art and achieve the object thereof. It has a configuration. That is, the measurement opening formed in the wall of the processing container of the granular material processing device to allow the measurement light to enter and exit from the processing container, and the measurement opening covering the measurement opening while allowing the measurement light to pass therethrough. Abut the periphery of the measurement opening,
And a measurement window means that is slidable with respect to the measurement opening, and a peripheral edge of the measurement opening slides on the surface of the measurement window means when the measurement window means slides to perform a wiper function. Have.

The wiper means is preferably made of fluororesin.

[0010]

In the measuring window mechanism for the moisture measuring device of the powder and granular material processing apparatus according to the present invention, the measuring window means is slid with respect to the wiper means provided at the periphery of the measuring opening, whereby the measuring window The surface of the means is wiped. Even if the powder or granular material in the powder or granular material processing device adheres to the measurement window means, it is wiped off by this wiper action, so that a clean glass surface is always exposed in the processing container. Therefore, accurate and stable measurement results can be obtained by optical measurement of the water content of the flowing granular material. In particular, since no blown air current or hot air is used, and neither a protruding portion nor a recessed portion is formed with respect to the inside of the processing container, the flow state inside the processing container is disturbed, or the local inside of the processing container is disturbed. It does not form a non-uniform part in the heat state.
Therefore, without disturbing the uniform flow state of the powder or granules in the processing container, there is no possibility of generating a peculiar region of the powder or granules particularly around the measurement site. Therefore, the measured value is stable and accurate.

As the material of the wiper means, general-purpose plastics such as polyethylene resin, polypropylene resin, acrylic resin, nylon resin, vinyl chloride resin, phenol resin, amino resin and polyester resin, polyether sulfonic acid, polyether ether ketone resin , Engineering plastics such as polyetherimide resin, polyimide resin, polyphenylene sulfide resin, polysulfone resin, and polytetrafluoroethylene (P
TFE), polytetrafluoroethylene / perfluoroalkyl vinyl ether (PFA), tetrafluoroethylene / hexafluoropropylene vinyl ether copolymer (FEP), tetrafluoroethylene / ethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE) ), Polyvinylidene fluoride (PVD
F), a fluororesin such as polyvinyl fluoride (PVF), or the like, as long as it has heat resistance capable of withstanding the heating step of the powder processing apparatus and has a small friction during sliding contact with the measurement window means. . In particular, if the wiper means is made of fluororesin, the friction during sliding contact with the measurement window means is extremely small, the measurement window means slides smoothly, and the window surface is not damaged.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a measuring window mechanism for a moisture measuring device of a powdery or granular material processing apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 is a front view showing a first embodiment of a measuring window mechanism for a water content measuring apparatus of a powdery or granular material processing apparatus (fluidized bed processing apparatus in this embodiment) according to the present invention, and FIG. 1 is a sectional view taken along the line AA of the mechanism, and FIG. 3 is a sectional view taken along the line BB of the mechanism shown in FIG.
It is a line sectional view. In the drawings, reference numeral 1 denotes a side wall that defines a flow chamber of the fluidized bed processing apparatus, and a part thereof is shown in each drawing. The side wall 1 is a cylindrical wall having an inner diameter of 400 mm. A measurement opening 2 through which measurement light enters and leaves the side wall 1 of the flow chamber.
Are formed in a rectangular shape. The side wall 1 is mounted and fixed around the measurement opening 2 via a base 3 and two mounting brackets 4. The two mounting brackets 4 are fixed to each other on the base 3 so as to face each other, and the measurement window mechanism of this embodiment is supported therebetween. A frame 5 made of fluororesin is attached to the base 3 so as to fit around the measurement opening 2.
Is attached.

Reference numeral 6 in the figure denotes a cylindrical glass drum having both end surface portions and rotatably supported around an axis. The glass drum 6 is fitted to the frame body 5 and has its peripheral side surface exposed to the inside of the flow chamber, and measurement light can enter and leave the flow chamber through the measurement opening 2. The peripheral side surface of the glass drum 6 is in contact with the frame body 5 described above, and the rotating glass drum 6 is in sliding contact with the frame body 5. At this time, the edge portion of the frame body 5 acts as a wiper. Eggplant Therefore, even if the powder or granular material flowing in the fluid chamber adheres to the peripheral side surface of the glass drum 6 exposed in the chamber, it is wiped off by the edge portion of the frame body 5 by rotating the glass drum 6 and is always clean. The glass surface faces the fluid chamber and is exposed.
Therefore, accurate and stable measurement results can be obtained by optical measurement of water in the fluidized bed of powder and granules. Since the frame body 5 is made of fluororesin, friction during sliding contact with the glass drum 6 is extremely small, the glass drum 6 rotates smoothly, and the peripheral surface of the glass is not damaged. Since the peripheral side surface of the glass drum 6 does not extremely project or recess from the inner peripheral surface of the side wall of the flow chamber, it hardly disturbs the fluidized bed in the chamber. This is also an advantage for obtaining a stable measurement result.

In the glass drum 6, a shaft 7 fixed to a mounting bracket 4 is inserted inward from one end face side of the glass drum 6, and is rotatably supported on the outer periphery of the shaft 7. The fixing bolt 8 penetrates from the end surface on the opposite side of the glass drum 6 into which the shaft 7 is inserted. The tip of the fixing bolt 8 is screwed into the shaft 7 and fixed by a tightening nut 9. On the other hand, the base end portion of the fixing bolt 8 is also fixed to the mounting bracket 4 with the tightening nut 10. The glass drum 6 is thus rotatably supported. At the position adjacent to the glass drum 6,
The ultrasonic motor 11 is fixed to the mounting bracket 4. The ultrasonic motor 11 is arranged such that the output shaft 12 is hollow in the axial direction and the fixing bolt 8 is inserted therein. The output shaft 12 of the ultrasonic motor 11 is connected to the end surface of the glass drum 6 and drives the glass drum 6 to rotate. The both end portions of the glass drum 6 and the circumferential portion of the glass drum 6 are
The silicon packing 13 is sandwiched and fixed so that the rotation can be transmitted.

The shaft 7 has a through hole so that the optical fiber 14 can be inserted obliquely, and the optical fiber 14 for irradiating the infrared ray of the measurement light into the flow chamber and receiving the reflected light thereof, As shown in FIGS. 2 and 3, the glass drum 6 is inserted from an oblique direction with respect to the peripheral side surface.
With such an arrangement, the optical fiber 14 does not receive the measurement light reflected from the glass surface.

As shown in FIGS. 1 and 3, an arm member 15 extends from the mounting brackets 4 at both ends so as to sandwich the peripheral side surface of the glass drum 6 from the opposite side in the radial direction. An external wiper 16 is provided at a position where the arm member 15 faces the peripheral side surface of the glass drum 6 so as to assist the peripheral side surface of the glass drum 6 with a wiper. The external wiper 16 is also made of fluororesin.

Next, a second embodiment of the measuring window mechanism for the moisture measuring device of the powder and granular material processing apparatus (fluidized bed processing apparatus in this embodiment) according to the present invention will be described with reference to FIGS. 4 to 6. To do.

FIG. 4 is a front view showing a second embodiment of a measuring window mechanism for a moisture measuring device of a fluidized bed processing apparatus according to the present invention, and FIG. 5 is a motor and its mounting bracket in the mechanism shown in FIG. FIG. 4 is a left side view showing the timing belt and the timing belt. This embodiment is configured as a jig attached to the side wall of the flow chamber of the fluidized bed processing apparatus. Reference numeral 21 in the figure denotes a metal base plate for attaching and fixing the jig to the side wall of the fluid chamber of the fluidized bed processing apparatus, including a mounting flange portion 22 and a step portion 23 fitted into the side wall of the fluid chamber.
And have. The base plate 21 is formed with a recess 24 into which a unit of a measurement window mechanism described below is fitted. The stepped portion 23 of the base plate 21 is provided with a projecting height such that its end surface is substantially flush with the inner surface of the side wall of the flow chamber, and does not disturb the fluidized bed inside the chamber. Therefore, stable measurement results can be obtained.

The above-mentioned unit mainly includes a glass disk 26 having a rotary shaft 25, and the glass disk 26 having a recess 2
And a pressing plate 27 whose bottom surface is pressed against the crocodile. The pressing plate 27 has four corners fixed with screws,
A coil spring 28, which is placed in the under-neck portion of the screw, exerts a biasing force that presses the glass disk 26 against the bottom surface of the recess 24. An opening 29 is formed on the bottom surface of the recess 24 so as to penetrate the step portion 23, and a similar opening 30 is formed at the same position of the pressing plate 27. The infrared rays of the measuring light are transmitted through the glass disk 2 at the positions of the openings 29 and 30.
It is possible to irradiate through 6 into the flow chamber.

The rotating shaft 25 of the glass disk 26 extends through the pressing plate 27, and the rotating shaft 25 is also provided with a coil spring 31 for pressing the pressing plate 27. Reference numeral 32 in FIG. 5 denotes a bush that is mounted on the rotary shaft 25 and receives one end of the coil spring 31. The bracket 33 for supporting the rotating shaft 25 of the glass disk 26,
It is fixed to the base plate 21 by being bridged from both sides of the recess 24. The bracket 33 has
The rotary shaft 25 of the glass disk 26 is supported via a bearing 34, and the tip end of the rotary shaft 25 projects above the upper end surface of the bracket 33 and a timing pulley 35 is fitted therein.

As shown in FIG. 4, a waterproof geared motor 36 is arranged beside the bracket 33 as a drive motor for the glass disk 26, and is mounted and fixed to the base plate 21 so as to straddle the bracket 33. ing. The output shaft of the motor 36 extends to the back side in FIG. Reference numeral 37 in the drawing denotes a motor bracket for supporting the motor.
A timing belt 38 connects the motor 36 and the rotary shaft 25 of the glass disk 26.

The bottom surface of the recess 24 of the base plate 21 and the back surface of the pressing plate 27 (the surface facing both sides of the glass disk 26).
6, a seal ring 39 having a shape as shown in FIG. 6 is fitted at a position shown by a broken line in FIG. The seal ring 39 is a ring made of fluororesin and has a sealing function and a wiper function for the glass disk 26.
Therefore, even if the granular material flowing in the flow chamber adheres to the surface of the glass disk 26 exposed in the room, it is wiped off by the seal ring 39 by rotating the glass disk 26, and a clean glass surface always flows. It is exposed by facing the room. Therefore, accurate and stable measurement results can be obtained by optical measurement of water in the fluidized bed of powder and granules.

In each of the above-mentioned embodiments, the cylindrical and disk-shaped rotating bodies are used as the glass body of the measuring window, and the sliding motion is performed by rotating these, but the simplest form is the flat plate-like shape. It is also possible to drive the glass body of (1) with a linear reciprocating means such as a fluid cylinder, slide it with respect to the side wall of the flow chamber in a linear reciprocating motion, and fix the wiper blade made of fluororesin in the middle of the slide path. Of course it is possible.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a measurement window mechanism for a moisture measuring device of a powdery or granular material processing device according to the present invention.

FIG. 2 is a sectional view taken along line AA of the mechanism shown in FIG.

FIG. 3 is a sectional view taken along line BB of the mechanism shown in FIG.

FIG. 4 is a front view showing a second embodiment of the measurement window mechanism for the moisture measuring device of the powdery or granular material processing device according to the present invention.

5 is a left side view of the mechanism shown in FIG. 4 with the motor, its mounting bracket, and a timing belt omitted.

FIG. 6 is a plan view showing a seal ring used in the mechanism shown in FIG.

[Explanation of symbols]

 1 Side wall of flow chamber 2 Measurement opening 3 Base 4 Mounting bracket 5 Frame 6 Glass drum 7 Shaft 8 Fixing bolt 9 Tightening nut 10 Tightening nut 11 Ultrasonic motor 12 Output shaft 13 Silicon packing 14 Optical fiber 15 Arm member 16 External wiper 21 Base Plate 22 Mounting Flange 23 Stepped Part 24 Recess 25 Rotating Shaft 26 Glass Disc 27 Pressing Plate 28 Coil Spring 29 Opening 30 Opening 31 Coil Spring 32 Bushing 33 Bracket 34 Bearing 35 Timing Pulley 36 Motor 37 Motor Bracket 38 Timing Belt 39 Seal ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuo Kajitani Ikuo Kajitani 2-431, Kutarocho, Chuo-ku, Osaka City, Osaka Prefecture 8 Grand Patio Hirakata 118 (72) Inventor Kennobu Ito 1-1-19 Kusuha Namiki, Hirakata City, Osaka Prefecture Riviera Heights 201 Kusuha Namiki 201 (72) Inventor Toyoka Yokoyama 2-29 Sayama Kitayo, Kumiyama-cho, Kuse-gun, Kyoto Prefecture

Claims (2)

[Claims] 1. A measurement opening (2, 29) formed in a processing container wall (1) of a powdery or granular material processing device to allow measurement light to go in and out of the processing container, and to cover the measurement opening. A measurement window means (6, 26) slidable with respect to the measurement opening while allowing the measurement light to pass therethrough, and the measurement opening means is provided with the measurement window means (6, 26). A water content measuring device for a powdery or granular material treating apparatus, characterized in that it has wiper means (5, 39) that slides on the surface of the measurement window means (6, 26) and slides to act as a wiper. Measuring window mechanism. 2. The measurement window mechanism for a moisture measuring device of a powdery or granular material processing device according to claim 1, wherein the wiper means (5, 39) is made of fluororesin.