JP2001174155A - Centrifugal thin film dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily control the correct position of a blade at a job site without using a surface plate. SOLUTION: This centrifugal thin plate dryer comprises a cylindrical heat transfer body 5 having an inner peripheral surface as a heat transfer surface 5a, a main shaft 19 rotatably disposed in the body 5, and a blade 33 advancingly or retractably mountable at the shaft 19. The dryer further comprises a setter 49 for advancingly and retractably supporting the blade 33 in a state in which the one end is contacted with the outer peripheral surface of the shaft 19. In this case, the blade 33 is advanced or retracted so that the magnetic density of a magnet 69 set to the blade 33 becomes a set value while measuring the magnetic flux density of the magnet 69 set to the blade 33 by a magnetic flux density measuring instrument 51 from a measuring window 57 of the setter 49, and hence the size from the surface 5a to the end of the blade is calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a centrifugal thin film dryer.

[0002]

2. Description of the Related Art In general, a centrifugal thin-film dryer generally has a rotatable main shaft disposed inside a vertically long heat transfer cylinder whose inner wall surface is heated, and a blade extending along the longitudinal direction of the main shaft. Are provided at predetermined intervals. The upper part of the heat transfer cylinder is an intake part for taking in sludge and the like, and the lower part is a take-out part for taking out dried sludge as dry powder by evaporating water in the heat transfer cylinder.

[0003]

The blade is shown in FIG.
As shown in FIG. 11, a movable blade 1 formed in a plate shape
01 and a fixed blade 103. The fixed blade 103 is a mounting seat 107 for the rotatable main shaft 105.
The movable blade 101 is attached to the fixed blade 103 by a hinge pin 109, and the movable blade 101 is rotatable around the hinge pin 109.

As a result, the movable blade 101 is
05 rotates, the centrifugal force causes it to swing out about the hinge axis X of the hinge pin 109, approach the heat transfer surface 113 of the heat transfer cylinder 111, and create a gap d between the heat transfer surface 111 and the blade tip. create. When the processing object passes, the gap d
This is an important element to which heat is given from the heat transfer drum 111, and is set to be optimal when the hinge axis X of the hinge pin 109 faces the blade centrifugal line Y.

The gap d between the movable blade 101 is adjusted by providing an adjustment hole 115 in the fixed blade 103 and loosening a fixing bolt 117 screwed into the adjustment hole 115.
Can be adjusted.

To adjust the gap d, at a factory, the fixing bolt 117 is loosened, and the main shaft 105 temporarily supporting the fixing blade 103 is horizontally set and supported on a surface plate (not shown). Next, a piano wire for setting the distance from the axis of the main shaft 105 to the movable blade tip is set along the movable blade 101, and then the fixed blade 103 in the temporarily supported state is moved to the piano wire by a tool. The position is adjusted until it is positioned, and after the adjustment is completed, the fixing bolt 117 is tightened and fixed, so that the heat transfer surface 11 is
The position adjustment of the movable blade 101 with respect to the position 3 is performed.

[0007] The conventional blade position adjustment requires a surface plate, so that the blade position adjustment cannot be performed on-site, so that it is troublesome to take it back to the factory, and it is not desirable in terms of work efficiency. .

[0008] Therefore, the present invention provides a centrifugal thin-film dryer in which the position of the blade can be easily adjusted on site without using a surface plate, and an accurate gap can be obtained. It is an object.

[0009]

In order to achieve the above object, according to the present invention, a heat transfer cylinder having an inner surface as a heat transfer surface, and a main shaft rotatably disposed in the heat transfer drum. A blade that is attached to the main shaft and rotates the inner surface of the heat transfer drum, and a blade position detector that determines the distance between the inner surface of the heat transfer drum and the tip of the blade from the magnetic flux density of the magnet attached to the blade. .

After the magnet is set on the upper edge of the temporarily supported blade, the magnetic flux density of the magnet is measured by the blade position detector. At this time, the position is adjusted by moving the blade forward and backward so that the measured value of the magnetic flux density becomes the specified set value, and the blade is tightened and fixed when the set value is reached. As a result, accurate blade position adjustment can be performed on site.

According to a second aspect of the present invention, a cylindrical heat transfer drum having an inner wall surface serving as a heat transfer surface, a main shaft rotatably disposed in the heat transfer drum, and a transfer shaft mounted on the main shaft. In a centrifugal thin film dryer with a blade that rotates the inner surface of the heating drum,
A blade support mechanism that supports the blade so that it can move forward and backward with respect to the heat transfer surface, in conjunction with the movement of the blade support mechanism,
A pickup that supports the pickup arm so that it can move forward and backward with respect to the heat transfer surface, and keeps the gap between the heat transfer surface and the blade tip at a specified size when the tip of the pickup arm comes into contact with the heat transfer surface due to rotation of the main shaft. An arm support mechanism.

Thus, when the tip of the pickup arm comes into contact with the heat transfer surface due to the rotation of the main shaft, a gap of a prescribed size is obtained at the tip of the blade from the heat transfer surface. Moreover, even if the heat transfer surface is not a perfect circle, the pickup arm support mechanism follows the heat transfer surface, and a gap with an accurate prescribed dimension can always be obtained. For this reason, there is an advantage that a processing step of processing the inner surface of the heat transfer cylinder into a perfect circle can be omitted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be specifically described with reference to FIGS.

In FIG. 3, reference numeral 1 denotes a main body of the centrifugal thin film dryer 3. The main body 1 has a double structure,
Heated steam is fed between the inner wall surface and the outer wall surface having the double structure, so that the inner wall surface forms a heated heat transfer drum 5.

The upper portion of the heat transfer drum 5 has an upper drum 13 provided with a steam outlet 9 and a sludge inlet 11, and inside the upper drum 13, the sludge from the sludge inlet 11 is uniformly rotated by rotation. And a dispersing ring 15 for applying pressure downward. The lower portion of the heat transfer drum 5 is a powder take-out section 17 for taking out dry powder.

Inside the heat transfer drum 5, a vertically long main shaft 19 is provided.
The upper end of the main shaft 19 is rotatably supported at both ends by an upper bearing portion 21 provided at the upper shell 13, and the lower end is rotatably supported by a lower bearing portion 23 provided at a lower end portion of the heat transfer drum 5. I have.

The main shaft 19 is extended upward from the upper body 13, and the transmission belt 3 is wound around a V pulley 25 provided on the extension shaft 19a and a V pulley 29 of the electric motor 27.
1, the rotational power of the electric motor 27 is provided.

Further, blades 33 are mounted on the main shaft 19 along the longitudinal direction, and the blades 33 thus mounted are arranged in four rows in this embodiment.

The blade 33 is composed of a plate-shaped movable blade 35 and a fixed blade 37, as shown in FIG. The fixed blade 37 is fixedly supported by a fixing bolt 41 on a mounting seat 39 provided on the main shaft 19, and the fixed blade 37 serving as a support area is provided with a horizontally elongated hole 43. Therefore, by loosening the fixing bolt 41, the blade 3
3 forward / back adjustment is possible.

The fixed blade 37 and the movable blade 35 are provided with blade hinge portions 43 and 44, respectively. The blade hinge portion 44 of the fixed blade 37 has a pair of upper and lower shapes so as to sandwich the blade hinge portion 43 of the movable blade 35 from above and below, and each of the blade hinge portions 43 and 44 faces the blade centrifugal line Y. The hinge pin 45 is inserted, and the movable blade 35 can rotate about the hinge pin 45 as a fulcrum.

The blade 33 is positioned by the blade position detector 47 as shown in FIG. 1, so that a specified gap d set with respect to the heat transfer surface 5a serving as the inner surface of the heat transfer drum 5 is ensured. ing.

The blade position detector 47 includes a setting device 49
And a magnetic flux density measuring device 51.

The setting device 49 is provided with an arc-shaped main shaft contact portion 51 for contacting the outer peripheral surface of the main shaft 19 at the rear end of the plate-shaped setting device main body, while the front end and both sides are provided with a lower portion. And a front vertical wall 53 and side vertical walls 55 which are shortly extended.

The front vertical wall 53 is provided on the heat transfer surface 5 a of the heat transfer cylinder 5.
The inner wall surface 53a is set to the same dimension as the dimension from the spindle axis P of the spindle 19 to the heat transfer surface 5a. A measurement window 57 made of a transmissive panel is provided at the center of the front vertical wall 53.

A set bolt 59 and a vertically extending hinge pin suspending jig 61 are provided on the blade centrifugal line Y at the center of the setting device main body, and the movable blade 35 and the fixed blade 37 are moved by the hinge pin suspending jig 61. And a hinge pin 45 connecting the two is suspended and supported.

The set bolt 59 can be adjusted forward / backward in the direction of the arrow within the range of the long hole 63 provided in the setting device main body. The upper end of the hinge pin hanging jig 61 is located on the lower surface side of the setting device main body.
The nine screw portions 65 are screwed into the screw holes 67 to be integrally fixed and supported. The lower end of the hinge pin hanging jig 61 is a holding portion 67 that holds the head of the hinge pin 59 by a chuck.

On the other hand, the magnetic flux density measuring device 51 has a measuring window 57.
A measuring element having a measuring element 71 for detecting the magnetic flux density of the permanent magnet 69 placed and set on the upper end of the movable blade 35 in contact with the movable blade 35, and a display section 73 for displaying a measurement result based on a measuring signal from the measuring element 71 And a main body 75.

An outline of the measurement principle is that the magnetic flux density is related to the distance, so that the distance and the gap d can be determined by using a permanent magnet 69 having a predetermined magnetic flux density and measuring the magnetic flux density.

Thus, for example, in a factory, the set value of the blade 33 at the regular position measured on the surface plate is replaced with the magnetic flux density, and is incorporated in the measuring device main body 75 in advance as information for arithmetic processing. Is displayed as a prescribed set value, a distance from the heat transfer surface 5a to the blade tip, that is, a gap d is secured.

Therefore, in the field, the blade 33
In order to adjust the position, the fixing bolt 41 of the fixing blade 37 is loosened when the main shaft 19 is assembled into the heat transfer drum 5 or when the main shaft 19 is removed from the heat transfer drum 5 during maintenance. In a temporary support state.

Next, a permanent magnet 69 is set on the upper edge of the movable blade 35. When the permanent magnet 69 is set, the magnet front end surface 69a and the blade tip 35a of the movable blade 35
And are aligned on the same plane.

Next, the head of the hinge pin 45 of the blade 33 is held by a hinge pin suspending jig 61, and a setting device 49 is set on the jig 61 so that the spindle contact portion 51 contacts the outer peripheral surface of the spindle 19. . In this state, the set bolt 59 is inserted from above the setting device 49, and the screw portion 65 is screwed into the screw hole 67 of the hinge pin hanging jig 61.

Next, the measuring element 71 of the magnetic flux density measuring device 51 is applied to the measuring window 57 of the setting device 49 to measure the magnetic flux density of the permanent magnet 69, and the fixed blade 37 is moved forward and backward by a tool or the like to measure. Position adjustment is performed until a prescribed set value is displayed on the display unit 73 of the main body 75. After the position adjustment is completed, the fixing bolt 41 is tightened again to obtain the blade 33 at the regular position.

In this case, the operation of bringing back the spindle 19 to the factory is not required, and the operation of adjusting the position of the blade 33 can be easily completed on site, thereby greatly improving the operation efficiency.

FIGS. 4 to 9 show a second embodiment in which the positioning of the blade 33 with respect to the heat transfer surface 5a can be automatically set.

That is, the blade 33 is supported by the blade support mechanism 77 so as to be able to move forward and backward with respect to the heat transfer surface 5a, while the pickup arm 79 for positioning the blade 33 is moved forward and backward by the pickup arm support mechanism 81.
We support retreat freely.

In the blade support mechanism 77, two support arms 83 are extended forward from the first hinge 82 fixed to the main shaft 19 so as to be rotatable at a predetermined angle toward the front. A second hinge 84 is provided at the portion. From each second hinge 84, a blade arm 85 is rotatably extended rearward toward the first hinge 82 so that the support arm 83 is folded back, and the extended ends of the blade arms 85 are joined together. And is rotatably supported by the blade hinge 86 of the first embodiment.

The blade support mechanism 7 constructed as described above
7 are arranged vertically, the blade 33 retreats from the heat transfer surface 5a when the opening angle of the left and right support arms 83 increases, and when the opening angle decreases, the blade 33 moves to the heat transfer surface 5a.
It is free to move forward and backward to approach.

The pickup arm support mechanism 81 is provided with a second
The hinge 84 is vertically extended, and from the vertically extended end,
A pickup 87 is extended rearward on the first hinge 82 side in the same manner as the blade arm 85, and its extended end is rotatably supported by a pickup arm hinge 88 of a pickup arm 79 in a state of being joined together. Structure.

The pickup arm 79 is formed in a rod shape, and when receiving the action of centrifugal force due to the rotation of the main shaft 19,
The tip portion 79a comes into contact with the heat transfer surface 5a.

The length of the pickup arm 79 is set so that a gap d is defined from the heat transfer surface 5a to the blade tip 33a of the blade 33 when the tip portion 79a contacts the heat transfer surface 5a. I have.

As shown in FIG. 7, the pickup arm 79 includes a movable arm 90 and a fixed arm 91. The movable arm 90 is constantly urged forward by an urging spring 92, and The tip portion 90a is surely a heat transfer surface
It is good also as a structure which contacts a.

In this case, in order to reduce the contact resistance between the distal end portion 90a and the heat transfer surface 5a, as shown in FIG. 8, a ball bearing 94 biased by a biasing spring 93 is applied to the distal end portion of the movable arm 90. Alternatively, graphite 95 may be provided as shown in FIG.

Since the other components are the same as those of the centrifugal thin film dryer of the first embodiment, the same reference numerals are given and the detailed description is omitted.

Therefore, according to the second embodiment configured as described above, the tip 79a of the pickup arm 79 receives the action of the centrifugal force when the main shaft 19 rotates, so that the heat transfer surface 5a of the heat transfer cylinder 5 is moved. As a result, a gap d having a prescribed dimension from the heat transfer surface 5a is secured at the blade tip 33a of the blade 33, and efficient processing can be obtained.

Further, as shown in FIGS. 5A and 5B,
The tip 79a of the pickup arm 79 has a function of following the shape of the heat transfer surface 5a having a different diameter and maintaining a constant gap d between the blade tip 33a and the heat transfer surface 5a.
For example, a prescribed gap d can be obtained even with a slight ellipse. Therefore, the work of processing the heat transfer surface 5a of the heat transfer cylinder 5 into a perfect circle can be omitted.

[0047]

As described above, according to the present invention, a gap between the blade tip and the heat transfer surface can be easily secured and set on site without using a surface plate.

Further, since the heat transfer surface can be followed by the pickup arm, a specified gap can be obtained even with a slight ellipse. Therefore, a processing operation for processing the heat transfer surface of the heat transfer cylinder into a perfect circle can be omitted.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a blade position detector of a blade according to the present invention.

FIG. 2 is a schematic side view of FIG.

FIG. 3 is a schematic perspective view in which a part of a centrifugal thin film dryer is cut.

FIG. 4 is a partial perspective view showing a second embodiment in which a gap between a heat transfer surface and a blade tip can be automatically secured.

FIG. 5 is an exploded perspective view of a part of a blade support mechanism and a pickup arm support mechanism.

FIGS. 6A and 6B are explanatory views of an operation in which a pickup arm follows the diameter of the heat transfer surface (a) and (b) and a blade always keeps a constant gap.

FIG. 7 is an explanatory view showing another embodiment in which a pickup arm can be extended and contracted.

FIG. 8 is an explanatory view showing another embodiment in which a ball bearing is provided at the tip of a retractable pickup arm.

FIG. 9 is an explanatory view showing another embodiment in which graphite is provided at the tip of a pickup arm which can be extended and contracted.

FIG. 10 is a schematic plan view showing a conventional blade mounting structure.

FIG. 11 is a schematic side view of FIG. 10;

[Explanation of symbols]

 5 Heat transfer cylinder 5a Heat transfer surface 19 Main shaft 33 Blade 47 Blade position detector 69 Magnet

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L113 AA04 AB05 AB08 AC76 BA37 CA06 CB40 DA07 4D059 AA03 BD11 BD24 BD26 BJ03 EA20 4D076 AA02 BA13 BA19 CD02 CD03 DA03 DA25 EA31 FA22 HA09 JA05

Claims (2)

[Claims] 1. A heat transfer drum having an inner surface as a heat transfer surface, a main shaft rotatably disposed in the heat transfer drum, a blade mounted on the main shaft and rotating the heat transfer drum inner surface, and a heat transfer drum inner surface. A blade position detector for determining a distance between the blade and the tip of the blade from a magnetic flux density of a magnet attached to the blade. A cylindrical heat transfer cylinder having an inner wall surface serving as a heat transfer surface; a main shaft rotatably disposed in the heat transfer cylinder; and a blade mounted on the main shaft and rotating the heat transfer drum inner surface. In the centrifugal thin film dryer, a blade support mechanism that supports the blade so that it can move forward and backward with respect to the heat transfer surface, and the pickup arm can move forward and backward with respect to the heat transfer surface in conjunction with the movement of the blade support mechanism And a pickup arm supporter that keeps a gap between the heat transfer surface and the blade tip to a specified size when the tip of the pickup arm comes into contact with the heat transfer surface by rotation of the main shaft. Centrifugal thin film dryer.