JP2764289B2 - Supply method of material to be dried in vacuum dryer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-type dryer for continuously drying a liquid, slurry-like, or paste-like material having low fluidity, and more particularly to a belt-type dryer. It relates to a dry material discharge mechanism.

2. Description of the Related Art Generally, solids and liquids are dried more efficiently as the evaporation area is increased.When drying solid or dry materials, they are crushed, pulverized, and shallow dish-shaped. Measures have been taken to increase the evaporation area, such as by placing it in a container or spraying it, but the liquidity is low and the measures described above cannot be taken.
Alternatively, when the paste-like material to be dried is continuously dried, a method of drying the material to be dried on a conveyor belt using a belt-type dryer is used.

In this method, the conveyor belt is used as a carrier for holding the material to be dried. As shown in FIG. 4, the material to be dried is placed above the starting end of the conveyor belt (41) moving at a constant speed V. The discharge nozzle is positioned, and while the material to be dried (42) is quantitatively discharged from the discharge nozzle, the material is reciprocally moved left and right, and this is placed on a conveyor belt in a zigzag manner.

By the way, in the conventional method described above, the material to be dried (4
2), as shown in FIG. 4, overlapping occurs at the turn-back portion (A) of the discharge nozzle, and this portion (A) becomes thick. Therefore, in this part (A), the drying speed of the material to be dried (42) is lower than that of the other parts, and as a result, drying unevenness has occurred. Further, the material to be dried is not discharged to the portion (C) between the portions (A), which is a blank portion, and the conveyor belt is not used effectively, which causes a reduction in work efficiency.

Therefore, as a measure to avoid overlapping of the materials to be dried,
As shown in FIG. 5, a method has been proposed in which the swinging motion is temporarily stopped every time the discharge nozzle reaches the turning point (Japanese Patent Application Laid-Open No. 61-223482; already proposed 1).

In this method, the overlap of the members to be dried is eliminated in the portion (B) where the discharge nozzle has stopped swinging. However, the blank part (C) has a disadvantage that it further increases. Further, in the part (B), the discharge nozzle apparently moves at the same speed as the traveling speed of the conveyor belt (41). Therefore, the thickness of the material to be dried is inversely proportional to the moving speed of the discharge nozzle. In view of the fact that the traveling speed v of the conveyor belt (41) is a fraction of the swing speed V of the discharge nozzle, in the portion (B) where the discharge nozzle is temporarily stopped, the material to be dried (42) is It is several times thicker than other parts. For this reason, the material (42) to be dried in this part (B) has a problem that drying is rather slowed down and work efficiency is reduced.

In order to cope with the above-mentioned problems, the present applicant has already proposed an appropriate configuration (Japanese Patent Application Laid-Open No. 63-155699; hereinafter, it is referred to as Proposed 2). In this proposal (a method for controlling a discharge nozzle of a material to be dried in a vacuum dryer), in a belt-type dryer for processing a material to be dried having a low fluidity, the discharge nozzle of the material to be dried is controlled by a traveling speed of a conveyor belt. Reciprocatingly swing right and left at a sufficiently high speed, and every time the discharge nozzle reaches the turning point on the left and right, move the tip of the discharge nozzle toward the start end of the belt conveyor at a speed similar to or slightly higher than the above-mentioned swing speed. The above-mentioned problem is solved by the method of causing the above.

Problems to be Solved by the Invention The present invention is also to solve the above-mentioned problem in the method for supplying a material to be dried as in the case of Proposal 2, and the apparatus configuration from a viewpoint different from that of the proposal and its configuration. It is an object of the present invention to propose a device that solves the above-mentioned problems by control. It should be noted that the present invention has an advantage that higher-speed operation can be realized as compared with Proposal 2.

Means for Solving the Problems According to the present invention, the nozzle guide (11) fixed in the width direction from the transport start end, and the tip is located above the transport start end and extends substantially perpendicular to the belt surface. A discharge nozzle (5) which is open and is slidably mounted along the nozzle guide (11); and a drive means for both of the discharge nozzles (5). The nozzle reciprocates right and left at a speed that is sufficiently fast with respect to the speed. Each time the tip of the discharge nozzle reaches the turning point on the left and right, the nozzle guide (11) is rotated about the width direction to change the discharge direction to the belt surface. So that the intersection of the extension line of the discharge nozzle and the belt surface is moved toward the start end of the belt conveyor at a speed higher than the swing speed, that is, when the discharge nozzle reaches the turning point, the nozzle guide The The tip of the discharge nozzle is turned in the direction opposite to the direction of travel of the conveyor belt by turning on the tilt plane, and the end point of the material to be dried is about the same as the application width of the material to be dried. It is driven to move as described above.

Alternatively, according to the present invention, an arm (25) positioned above the conveyor start end of the conveyor belt (3) and rotatably supported in a horizontal plane at one end and extending at the other end to the start end; A rotation drive means (14) for rotating the (25), and one end is rotatable in a horizontal plane about an axis of a rotation actuator (24) mounted below the conveyor belt start end of the arm (25). An arm (7) pivotally supported at the other end and extending toward the end of the conveyor belt; and an arm (7) fixed near the end of the arm (7), the leading end of which is located above the transport start end and substantially faces the belt surface. A discharge nozzle (5) extending in a substantially vertical direction and opening, and the rotation actuator (2
4) to drive the tip of the drying material discharge nozzle to reciprocate left and right at a speed sufficiently higher than the traveling speed of the conveyor belt, and to rotate each time the discharge nozzle tip reaches the left and right turning points ( 14), the arm (25) is rotated to move the entire nozzle swinging portion alternately to a line symmetrical position with respect to the belt traveling direction, so that the intersection of the discharge nozzle tip extension line and the belt surface is turned right and left. To move the belt conveyor toward the start end at a temperature higher than the swing speed.

With any of these configurations, it is possible to eliminate the overlap of the materials to be dried, thereby preventing a delay in drying, and at the same time, to reduce a blank portion (material absent portion) on the conveyor belt caused by the advance of the belt.

The liquid, slurry or paste-like material to be dried has a small space due to the left-right swinging movement of the discharge nozzle and the higher-speed forward-backward movement at the left and right turning points, so that the conveyor belt surface is effectively used and overlaps. Can be placed on a conveyor belt without any problems. The material to be dried is uniformly dried as a whole while reaching the end of the belt conveyor, and is taken out of the system.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to the drawings based on examples.

FIG. 1 is a partial cross-sectional view showing an embodiment of a discharge mechanism together with a vacuum dryer in which a discharge nozzle attached to a nozzle guide (11) of the present invention is configured to rotate on a vertical plane along a transport direction. It is a side view, and a code | symbol (1) is a vacuum chamber in a figure, and (2) is a belt conveyor. These are the main components of the vacuum dryer and are not particularly different from ordinary ones of this type. Therefore, although a detailed description thereof will be omitted, the vacuum chamber (1) is provided with a vacuum device including a vacuum pump, a cold trap, a chiller unit, etc., and maintains the inside at a predetermined degree of vacuum. And a heating plate and a cooling plate are provided therein to heat the material to be dried (4) placed on the conveyor belt (3) of the belt conveyor (2). Alternatively, cooling is performed, and an outlet is formed near the rear portion so that the dried material is taken out of the system. on the other hand,
The conveyor belt (3) of the belt conveyor (2) has a low water permeability or no water permeability because the material to be dried (4) placed on the conveyor belt (3) is a liquid, slurry or paste having a low fluidity. It is formed using a sheet material. Of course, the conveyor belt (3) is coated in advance with a resin such as polytetrafluoroethylene depending on the type of the material (4) to be dried, and is subjected to a surface treatment so that the dried material can be easily separated from the belt. I have.

Further, a discharge nozzle (5) is located above the transport start end of the conveyor belt (3), and the material to be dried is supplied quantitatively by a pump or the like (not shown) and is applied onto the conveyor belt (3). It has become so.

The present invention is applied to a vacuum dryer having such a configuration.

(11) in the figure is the nozzle guide (spline shaft)
The conveyor belt (3) is positioned so as to extend in the width direction orthogonal to the belt conveyance direction from the conveyance start end, and is supported by the nozzle guide support (12) at both ends, and the nozzle holder (8) slides. Mounted freely. The nozzle guide support (12) is rotatably supported at its center by a support bearing (13), and can be swung by an air cylinder (14) connected to one end. Accordingly, the supported nozzle guide (11) itself can swing about the substantially central portion as the axis and in parallel with the conveyor belt surface.

On the other hand, the nozzle holder (8) has a pin (10) and a long hole (9).
And connected to the arm (7) through the arm (7).
Is held at the time of swinging (6). The nozzle holder (8) supports the discharge nozzle (5). Therefore, when the arm (7) is swung by the swing shaft (6), the nozzle holder (8) reciprocates along the nozzle guide (11), and the discharge nozzle (5) also moves to the nozzle guide (11). Reciprocate in parallel.

 Subsequently, an example of a driving mode of the swing shaft (6) will be described.

As shown in FIG. 3, a camshaft (17) and a spline shaft (18) are provided laterally above the vacuum chamber (1). These are operating members for reciprocatingly rotating the oscillating shaft (6) and oscillating the discharge nozzle (5). The camshaft (17) is formed with a reciprocating spiral groove (16). At the same time, the spline shaft (18) has a shoe holder (19)
Are slidably mounted, and a shoe (20) is protruded from the shoe holder (19).

The shoe (20) is engaged with the reciprocating spiral groove (16), the cam shaft (17) is connected to a drive motor (not shown), and the shoe holder (19) is rotated by rotating the cam shaft (17). ) Reciprocate along the spline shaft (18). An arm (15) is fixed to the swing shaft (6), while an eight shoe holder (19) is provided.
Is provided with an operation arm (21), and both are linked by a pin (22) and an elongated hole (23). Therefore, when the camshaft (17) is rotated, the rotation is transmitted to the shoe holder (19) via the shoe (20), and the movement is further transferred to the operation arm (21), the pin (22), and the slot (2).
It is transmitted to the arm (15) via 3), and reciprocates the swing shaft (6).

Although not shown in FIG. 3, the air cylinder (14) operates in synchronization with the reciprocation of the shoe holder (19). At that point, it operates to rotate the nozzle guide (11) in a direction in which the discharge nozzle (5) at the turning point moves toward the start end of the belt conveyor (2). The control of the air cylinder (14) for this need only repeats successive expansion and contraction each time the shoe holder (19) reaches the left and right turning points. That is, as shown in FIG. 2, when the discharge nozzle is at the turning point on the upper side of the figure, the air cylinder (14) contracts and the nozzle guide (11) is rotated counterclockwise by a predetermined amount to discharge nozzle. (5) moves toward the start end of the belt conveyor (2) (left side in FIG. 2), but when the discharge nozzle is at the opposite turning point (lower in FIG. 2), the air cylinder (14) is extended. As a result, the nozzle guide (11) rotates clockwise by a predetermined amount, and the discharge nozzle (5) also moves toward the start end of the belt conveyor (2).

In the apparatus configured as described above, the distance traveled by the conveyor belt (3) during the time when the discharge nozzle (5) reciprocates once along the nozzle guide (11) is defined as (2a), and discharge is performed as shown in FIG. The swing of the discharge nozzle (5) is started in a state where the nozzle guide (11) is inclined toward the start end of the belt with respect to a line perpendicular to the traveling direction of the belt by (a) at the turning point of the nozzle (5). The trajectory of the material to be dried (4) on the belt is a line perpendicular to the traveling direction in harmony with the traveling speed of the belt as shown in FIG.
When the discharge nozzle (5) reaches the turning point, the nozzle guide (11) is quickly moved by the air cylinder (14) at a speed faster than the swing speed of the discharge nozzle (5) toward the start end of the belt (a). ) Rotate horizontally to move. This rotation causes the nozzle guide (11) to tilt in the direction opposite to the previous direction.
Accordingly, the trajectory drawn on the belt on which the discharge nozzle (5) moving in the opposite direction in parallel with the nozzle guide (11) thereafter becomes perpendicular to the direction of travel. The trajectory thus formed is a group of parallel lines separated by a distance (a) as shown in FIG. By making the distance (a) equal to or slightly smaller than the width (w) occupied by the material to be dried (4) coming out of the discharge nozzle (5) on the belt, the material to be dried (4) is removed except on both sides of the belt. )), And the material to be dried (4) can be supplied onto the belt without thickening due to overlap. In the above description, the movement of the discharge nozzle (5) is regulated by using the nozzle guide (11), and the nozzle guide (11) is rotated. However, a different form may be adopted.

That is, as shown in FIG. 7, the discharge nozzle (5) is fixed to the tip of the arm (7), and the arm (7) is moved to the swing shaft (6).
The same effect can be obtained by swinging the entirety of such a supply device horizontally about a predetermined axis including the swing axis (6) after swinging horizontally about. In the embodiment shown in FIGS. 7 and 8, an arm (7) is attached to a swing shaft (6) of a rotary actuator (24) that swings by compressed air or the like, and a discharge nozzle ( 5) Install.

The rotary actuator (24) is supported at one end of a support arm (25), and the other end of the support arm (25) is located at the center of the swing width in which the discharge nozzle (5) swings in FIG. It is rotatably supported by a bearing (26) installed at a position closer to the discharge nozzle (5), and pivots or holds a support arm (25) at the extension end on the side of the rotation actuator (24). One end of an air cylinder (14) is attached. The discharge nozzle (5) swings in a circular arc horizontally on the conveyor belt (3) by the operation of the rotary actuator (24).

When the oscillating discharge nozzle (5) oscillates in such a configuration reaches the point (A), the discharge nozzle (5) moves by the distance (a).
Is moved in the direction of the starting point of the conveyor belt (3), and the support arm (25) is rotated about the bearing (26) by the air cylinder (14) so as to reach the point (B). By this rotation, the swing center axis of the discharge nozzle (5) moves from (E) to (F).
At the same time, the discharge nozzle (5) moves at a speed higher than the swing speed from (A) to (B) toward the start end of the belt conveyor, and thereafter the discharge nozzle (5) moves from (B) to (C).
Draw an arc centered on (F). By moving the swing center from point (F) to point (E) at point C, the ejection nozzle (5) moves quickly from point (C) to point (D), and then moves from point (D) to point (A). Draw an arc centered on (E). Thus, the discharge nozzle (5) changes from (A) → (B) →
(C) → (D) → (A) → (B) →..., And along with the progress of the belt, the trajectory of the discharge nozzle (5) on the conveyor belt (3) is as shown in FIG. Here, the distance (a) is determined in consideration of the application width of the material to be dried. The belt advances during the time that the discharge nozzle (5) performs one cycle of (A) → (B) → (C) → (D). Set the distance to 1/2.

With the above configuration, the belt surface can be used effectively as in the previous example, and the material to be dried can be evenly placed on the belt, so that the drying capacity and the drying quality can be increased.

As described above, according to the present invention, the configuration described in detail above, that is, when the discharge nozzle reaches the turning point, the entire supply device including the swing shaft is horizontally rotated or the discharge nozzle is rotated. The discharge nozzle is turned in the opposite direction to the direction of travel of the conveyor belt by rotating the nozzle guide that supports and guides and reciprocates and oscillates horizontally above the belt plane. So that the material to be dried is not overlapped,
This has the advantage of preventing delay in drying and reducing the blank area on the belt which has conventionally been caused by the progress of the belt, thereby making it possible to effectively use the conveyor belt surface and improving work efficiency. is there.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing one embodiment of an apparatus in which the method of the present invention is carried out, FIG. 2 is a plan view showing rotation of a nozzle guide, and FIG. FIGS. 4 and 5 are plan views showing the material to be dried according to the conventional method, FIG. 6 is a plan view showing the locus of the material to be dried according to the method of the present invention, and FIG. FIG. 8 is a vertical sectional front view showing another embodiment of the apparatus in which the method of the present invention is carried out. FIG. 8 is a plan view showing a main part of the apparatus shown in FIG. 7, and FIG. is there. (2): belt conveyor, (3): conveyor belt,
(4): material to be dried, (5): discharge nozzle, (6): swing shaft.

Claims (2)

(57) [Claims] An apparatus for discharging a material to be dried used in a belt dryer for processing a material to be dried in a liquid, slurry, or paste form having a low fluidity, comprising a conveyor belt (3) and a transport start end. A nozzle guide (11) extending in the width direction perpendicular to the belt conveyance direction and supported rotatably at a substantially central portion in parallel with the surface of the conveyor belt; A discharge nozzle (5) that is positioned and extends substantially perpendicularly to the belt surface and is slidably mounted along the nozzle guide (11); And a rotation driving means for reciprocatingly rotating the nozzle guide (11). The discharge nozzle of the material to be dried is sufficiently fast with respect to the traveling speed of the conveyor belt. Swings back and forth at speed When the tip of the discharge nozzle reaches the turning point on the left and right, the nozzle guide (11) is rotated horizontally to move the discharge nozzle toward the start end of the belt conveyor at a speed higher than the swing speed. Characteristic drying mechanism for vacuum dryer. 2. A material drying mechanism for use in a belt-type dryer for processing liquid, slurry, or paste-like materials to be dried having a low fluidity, wherein a conveying start end of a conveyor belt (3) is provided. An arm (25) having a first end rotatably supported on a horizontal plane and having the other end extending toward the start end, and a rotation drive means (14) for rotating the arm (25); One end of the arm (25) is rotatably supported in a horizontal plane by the axis of a rotation actuator (24) attached to the lower side of the conveyor belt near the start end, and the other end extends to the end of the conveyor belt. (7) a discharge nozzle (5) fixed near the end of the arm (7), the leading end of which is positioned above the transport start end and extends in a substantially vertical direction facing the substantially belt surface to open. The rotation actuator (24 To rotate the tip of the discharge nozzle of the material to be dried reciprocally right and left at a speed sufficiently higher than the traveling speed of the conveyor belt, and rotate each time the tip of the discharge nozzle reaches the turning point on the left and right. )
The arm (25) is rotated to move the entire nozzle swinging portion alternately to a line symmetrical position with respect to the belt traveling direction, so that the intersection of the extension line of the discharge nozzle tip and the belt surface is turned at the right and left turning points. A material to be dried discharge mechanism for a vacuum dryer, wherein the material is moved toward the start end of the conveyor at a temperature higher than the swing speed.