JP2003306221A - Screw conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce pressure-compaction of materials-to-be-carried dropped for discharge. <P>SOLUTION: A screw 4 is housed in a screw casing 1 provided with an inlet 2 in an upper part of one side to be driven for rotation by an external driving device 12. Discharge ports 3a, 3b, 3c and 3d are provided at a plurality of positions with required intervals in the carrying direction on a tip side of the screw casing. Each discharge port 3a, 3b, 3c and 3d is provided with an adjustment gate 15 for adjusting opening. In the condition that opening of each discharge port 3a, 3b, 3c and 3d is respectively adjusted by the adjustment gate 15, the material-to-be-carried 13 thrown into the screw casing 1 from the inlet 2 is carried to the tip side by a blade 6 of the screw 4, and discharged from each discharge port 3a, 3b, 3c and 3d for distribution to reduce discharge quantity per one part of the discharge ports 3a, 3b, 3c and 3d. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw conveyor suitable for carrying an object to be conveyed which has a large specific gravity and is easily compacted.

[0002]

2. Description of the Related Art In general, a screw conveyor is one of the conveying devices used for conveying powder or granules or a wet substance. Such a screw conveyor is shown in FIG.
(A) As shown in the outline of the example in (b), a screw provided with an inlet 2 at a position close to one end (base end) side and a rectangular tubular discharge port 3 below the other end (tip). Casing 1
Inside, the spiral screw blade 6 is provided on the outer peripheral surface of the shaft 5.
A screw 4 integrally attached to the casing 1 is housed along the longitudinal direction, and both ends of a shaft 5 of the screw 4 are rotatably supported by bearings 7 provided at axial center positions of both end walls of the casing 1. And screw casing 1
The driven sprocket 8 is attached by mounting the driven sprocket 8 on the base end side end of the shaft 5 which is protruded by a required amount to the outside of the driven sprocket 8
And a chain 11 for transmitting a driving force is endlessly wound between the drive sprocket 10 on the output shaft 9a of the speed reducer 9 installed at the side position of the casing 1, and the speed reducer 9
From the drive device 12 such as a motor connected to the speed reducer 9,
The rotation driving force transmitted through the chain sprockets 8 and 10 and the chain 11 allows the screw 4 to be rotationally driven, and the casing 1 is passed through the inlet 2.
The object 13 to be conveyed is continuously conveyed to the outlet 3 side by the blades 6 of the screw 4 which is driven to rotate, and the object 13 to be conveyed such as a hopper provided below the outlet 3 is received. It is designed to be dropped into the container 14 and discharged.

By the way, in recent years, fly ash generated in a thermal power plant or the like has been mixed with mortar for reuse. In this type of fly ash mortar production equipment, since the fly ash is difficult to handle in a fluffy state, it is humidified to make it easy to handle, and the fly ash produced at this time is humidified. Ash has a characteristic that it has a large specific gravity and is easily compacted.

[0004]

However, in the above-mentioned conventional screw conveyor, the discharge port 3 is located only at one position at the tip of the screw casing 1, and the adjustment of the opening size of the discharge port 3 and the change of the dropping position are performed. Was not taken into consideration, the target object 13 discharged from the discharge port 3
Are all dropped to one location in the receiving container 14,
In the receiving container 14, the objects 13 to be transferred are successively dropped and overlapped on the objects 13 to be transferred, so that the objects 13 to be transferred are piled up in a mountain shape, and the objects to be transferred are deposited. If the humidified ash of the fly ash 13 has a large specific gravity and is easily compacted, there is a problem that it is gradually compacted.
Further, when the carrying capacity of the screw conveyor is increased, the discharge amount of the object to be conveyed 13 is increased, so that the drop impact is increased, and thus there is a problem that the consolidation is further increased. Since No. 13 is tight, it may be difficult to use it in the next step.

Therefore, the present invention is intended to provide a screw conveyor which can reduce the compaction of discharged conveyed objects even when conveying the conveyed objects having a large specific gravity and being easily consolidated. Is.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a screw can be rotationally driven in a screw casing having an inlet at the upper end on one end and an outlet at the lower end on the other end. In a screw conveyor that is stored in a screw conveyor that is conveyed from the inlet into the screw casing and is conveyed by the screw to be dropped and discharged from the discharge port, in the lower portion on the other end side of the screw casing, A plurality of discharge ports are provided at required intervals in the transport direction.

The object to be conveyed, which has been introduced into the screw casing through the inlet, is conveyed in the front end direction by the screw which is rotationally driven, and then dispersed through a plurality of outlets provided on the front end side of the screw casing. Since the gas is discharged in this state, the amount of discharge per location of the discharge port can be reduced.

Further, the adjusting gate is provided for each of the plurality of outlets provided at the other end of the screw casing so as to adjust the opening amount of each outlet. Since the opening amount of the corresponding discharge port can be individually adjusted by, even if the transport amount of the transport target object is increased, it is possible to discharge the transport target object from each discharge port in a well-balanced manner. By adjusting each adjustment gate so that the discharge amount from the discharge port is increased, it becomes possible to change the discharge position of the object to be conveyed. Furthermore, when the object to be conveyed is discharged, a plurality of peaks can be formed by the angle of repose of the object to be conveyed. It is also possible to effectively use the internal volume of the receiving container for the object to be conveyed provided in the container.

Further, the screw is rotatably drivably housed in a screw casing having an inlet provided at an upper portion on one end side and an outlet provided at a lower portion on the other end side, and is conveyed into the screw casing through the inlet. In the screw conveyor which is designed to convey the object by the screw and to drop and discharge from the discharge port, the discharge port,
By having a configuration configuration that extends in the carrying direction and gradually widens from the upstream side to the downstream side in the carrying direction,
Since the object to be conveyed can be discharged at the upstream side position in the conveying direction of the discharge port and can be easily discharged as it goes to the downstream side, the discharge of the object to be conveyed can be dispersed along the conveying direction. It is possible to reduce the drop impact at the time of dropping and discharging, and to reduce the compaction of the discharged transport target.

Further, by providing the discharge port with an adjusting gate for adjusting the opening amount of the discharge port, the position at which the object to be conveyed is dropped and discharged can be freely set along the conveying direction. Since it can be changed to
Even if the transport amount of the transport target is increased, the transport target can be dispersed in the transport direction in a well-balanced manner and discharged, and further, a mountain formed by the repose angle of the transport target dropped and discharged in the transport direction. Since it is possible to average out,
It is possible to effectively use the internal volume of the container for receiving the object to be transported provided on the downstream side of the discharge port.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 (a) and (b) show an embodiment of the screw conveyor of the present invention.
In the configuration similar to that shown in FIG. 2, instead of providing the discharge port 3 at one location on the tip end of the screw casing 1, a plurality of locations at the tip end side of the screw casing 1 are arranged at required intervals in the transport direction, for example, 4 Square-shaped outlets 3a, 3b, 3c, and 3d are provided below the locations.

Further, each of the discharge ports 3a, 3b, 3c, 3
Each of the adjusting gates 15 is provided at d, and the corresponding adjusting gates 15 cause the corresponding discharge ports 3a, 3b, 3
The openings of c and 3d can be adjusted individually.

More specifically, each adjusting gate 15 is formed in a flat plate shape corresponding to the size of the discharge ports 3a, 3b, 3c, 3d, and is downstream of the discharge ports 3a, 3b, 3c, 3d in the conveying direction. Each of the discharge ports 3 is passed through a slit-shaped opening 16 formed in the upper end portion of the side wall so as to extend in the left-right direction.
a, 3b, 3c, 3d, and the left and right edge portions are connected to the discharge ports 3a, 3b, 3c,
3d is fitted to a guide member 17 extending in the transport direction, which is installed at a height position corresponding to the opening 16 on the inner surface of both left and right side wall portions, and is slidable in the transport direction, that is, the corresponding discharge port 3a, 3b, 3c, 3d are held so that they can be inserted and pulled out freely, and by adjusting the insertion amounts of the respective adjustment gates 15 into the corresponding discharge ports 3a, 3b, 3c, 3d, the respective discharges can be removed. Exit 3a,
The opening amounts of 3b, 3c and 3d can be freely adjusted. The adjustment gate 15 is slid in the conveying direction as shown in FIGS.
A handle portion 15a may be provided in the above to perform the operation manually, or an actuator (not shown) may be connected to each of the adjustment gates 15 and the corresponding actuator may be driven to perform the operation mechanically. Good.

Other configurations are the same as those shown in FIGS. 3A and 3B, and the same components are designated by the same reference numerals.

When the object 13 to be conveyed is conveyed by the screw conveyor having the above-mentioned structure, the drive unit 12 is driven by the drive unit 12 and the drive sprocket 1 as in the conventional case.
0, the chain 11, and the driven sprocket 8 to drive the screw 4 to rotate, and the respective discharge ports 3a, 3b, 3c, 3
With the adjustment gates 15 corresponding to the opening amounts of d,
For example, the discharge ports 3 lined up from the upstream side to the downstream side in the transport direction.
In a state where the opening amount is adjusted to gradually increase in the order of a, 3b, 3c, 3d, the object 13 to be conveyed is introduced into the screw casing 1 through the inlet 2. As a result, the object 13 to be conveyed is discharged inside the screw casing 1 by the blades 6 of the rotating screw 4.
It is moved in the 3b, 3c and 3d directions. After that, when the transport target 13 reaches the discharge port 3a located on the most upstream side in the transport direction, since the discharge port 3a is limited in opening amount, the transport target 13 is less than the total transport amount by the screw 4. Only part of them is dropped and discharged through the discharge port 3a into a receiving container 14 such as a hopper provided below. Next, when the object 13 to be conveyed remaining in the screw casing 1 reaches the discharge port 3b adjacent on the downstream side in the conveying direction, the discharge port 3b has an increased opening amount as compared with the discharge port 3a. The discharge port 3 is conveyed through the screw casing 1
Since the amount of the transportation target 13 that reaches b is reduced, a part of the transportation target 13 having the same amount as the discharge port 3a is dropped and discharged. After that, similarly, at the discharge port 3c, after the same amount as the discharge amount of the transport target 13 from the discharge ports 3a and 3b is dropped and discharged, the rest is discharged from the discharge port 3d on the most downstream side in the transport direction to the receiving container. It will be dropped and discharged.

At this time, the discharge ports 3a, 3b,
When the amount of the object 13 to be discharged from 3c, 3d is uneven, the adjusting gates 15 of the discharge ports 3a, 3b, 3c, 3d are appropriately operated, and the respective discharge ports 3 are discharged.
The discharge amount from a, 3b, 3c, 3d may be adjusted.

As described above, the objects 13 to be conveyed are provided at a plurality of discharge ports 3a, 3b, 3c, which are arranged at required intervals in the longitudinal direction.
Since it can be dispersed and discharged from 3d, the discharge amount per one place of the discharge ports 3a, 3b, 3c, 3d can be reduced. Therefore, at the time of discharging discharge of the object 13 to be transferred into the receiving container 14. It is possible to reduce the drop impact in the above, and to reduce the compaction of the discharged transport target 13.

Further, the discharge ports 3a, 3b, 3c, 3d are also provided.
Since each of them is provided with an adjustment gate 15 capable of individually adjusting the opening amount, each of the discharge ports 3a, 3
By adjusting the opening amount of b, 3c, 3d, even when the carrying amount of the screw conveyor is increased, the object 13 to be carried can be discharged from each discharge port 3a, 3b, 3c, 3d in a well-balanced manner. Further, by adjusting each adjusting gate 15 so as to increase the discharge amount from the specific discharge ports 3a, 3b, 3c, 3d, it becomes possible to change the discharge point. Furthermore, since there are a plurality of places for discharging the object 13 to be conveyed, a plurality of peaks are formed by the angle of repose of the object 13 to be conveyed when the object 13 is discharged to the receiving container 14. Compared with the case of discharging from the outlet 3, the discharge ports 3a, 3b, 3c, 3d
The internal volume of the receiving container 14 provided on the downstream side can be effectively used, and the handling amount of the transport target 13 can be increased.

Next, FIGS. 2 (a) and (b) show another embodiment of the present invention. FIG. 2 (a) (b) shows the same configuration as in FIG. 1 (a) (b). At the tip end side of the screw casing 1 shown, along the conveying direction, the discharge ports 3a, 3b,
Instead of having the configuration in which 3c and 3d are provided, a triangular opening that extends along the transport direction and gradually widens from the upstream side to the downstream side in the transport direction is provided at the lower portion on the tip side of the screw casing 1. A discharge port 18 provided with 18a is provided, and further, the discharge port 18 can be inserted and pulled out along the longitudinal direction from the upstream side in the transport direction at a position directly below the opening 18a. The adjustment gate 19 is provided, and the opening amount of the opening 18a can be adjusted by adjusting the insertion amount of the adjustment gate 19 into the discharge port 18. The adjustment gate 19 is formed in a rectangular flat plate shape corresponding to the size of the discharge port 18, and a slit-shaped opening formed at the upper end position of the upstream side wall of the discharge port 18 so as to extend in the left-right direction. The guide member 1 is provided so that it can be inserted into the discharge port 18 through 16 and the left and right edges are installed on the inner surfaces of the left and right side wall parts of the discharge port 18 and extend in the transport direction.
7 and is held slidably in the carrying direction, the opening amount of the discharge opening 18a is changed in the longitudinal direction by adjusting the insertion amount of the adjusting gate 19 from the upstream side in the carrying direction. It can be adjusted freely. The adjustment of the insertion amount of the adjustment gate 19 may be performed manually by providing a handle portion 19a, as in the adjustment gate 15 shown in FIGS. It may be mechanically performed by an actuator.

Other configurations are the same as those shown in FIGS. 1A and 1B, and the same components are designated by the same reference numerals.

According to the present embodiment, the outlet opening 18
Since a has a shape that extends in the longitudinal direction and gradually widens from the upstream side to the downstream side in the transport direction, the transport target 13 is suppressed in the upstream side in the transport direction and is more easily discharged in the downstream direction. Therefore, it is possible to disperse the object to be conveyed in a distributed manner along the conveying direction, and it is possible to reduce a drop impact when the object 13 to be conveyed is dropped into the receiving container 14 and discharged.
It is possible to reduce the compaction of the object to be transported 13 inside.

Further, since the discharge port 18 is provided with the adjusting gate 19 which can be inserted and pulled out from the upstream side in the carrying direction, the position where the carrying target 13 is dropped and discharged can be freely changed along the carrying direction. Therefore, even if the conveyance amount by the screw 4 is increased, the conveyance target 13
Can be discharged in a well-balanced manner, and the mountains formed by the angle of repose of the object to be conveyed 13 can be averaged when the particles are dropped into the receiving container 14 and discharged. It becomes possible to effectively use the internal volume.

The present invention is not limited to the above embodiment, but in the embodiment shown in FIGS. 1 (a) and 1 (b), the discharge ports 3a are provided at four positions on the tip side of the screw casing 1. , 3b, 3c, 3d are shown, the discharge ports may be provided at two or three places, or at five or more places, and the adjustment gate 15 is provided with the corresponding discharge ports 3a,
Any type may be adopted as long as the opening amounts of 3b, 3c, 3d can be adjusted to adjust the drop discharge amount of the conveyance target 13, respectively, as shown in FIG.
In the above embodiment, the opening 18a of the discharge port 18 is shown as an isosceles triangular shape extending along the transport direction, but the transport target 13 does not easily pass on the upstream side in the transport direction and passes on the downstream side. If the width on the downstream side is wider than the width on the upstream side in the carrying direction so as to be easy, the hypotenuse of the isosceles triangular shape as shown in FIG. 2B may be curved or trapezoidal. As the object 13 to be conveyed, as long as it has a large specific gravity and is easily compacted, it can be applied to a screw conveyor which is a dehydrated cake of sludge, etc. other than humidified ash of fly ash, and other aspects of the present invention. It goes without saying that various changes can be made without departing from the scope.

[0025]

As described above, according to the screw conveyor of the present invention, the following excellent effects are exhibited. (1) A screw is rotatably housed in a screw casing having an inlet at the upper end of one end and an outlet at the lower end of the other end, and the object to be conveyed is introduced into the screw casing from the inlet. In the screw conveyor configured to be conveyed by the screw to be dropped and discharged from the discharge port, a plurality of discharge ports are provided at required intervals in the transport direction at the lower part of the other end of the screw casing. Since the object to be transported can be dispersed and discharged from a plurality of discharge ports at required intervals in the longitudinal direction, and the discharge amount per one position of the discharge port can be reduced, the discharge target object can be dropped and discharged. It is possible to reduce the drop impact at the time and reduce the compaction of the conveyed object after being discharged. (2) For each of the plurality of discharge ports provided at the other end of the screw casing, by adopting a configuration in which an adjustment gate for adjusting the opening amount of each discharge port is individually provided,
Since the opening amount of the corresponding discharge port can be individually adjusted by the adjustment gate, even if the transport amount of the transport target object is increased, the transport target object can be discharged from each discharge port in a well-balanced manner. If each adjustment gate is adjusted so that the discharge amount from a specific discharge port is increased, it becomes possible to change the discharge position of the object to be conveyed. Furthermore, when the object to be conveyed is discharged, a plurality of peaks can be formed by the angle of repose of the object to be conveyed. It is also possible to effectively use the internal volume of the receiving container for the object to be conveyed provided in the container. (3) The screw is rotatably housed in a screw casing having an inlet at the upper end of the one end and an outlet at the lower end of the other end, and the object to be conveyed is introduced into the screw casing from the inlet. In the screw conveyor configured to be conveyed by the screw and dropped and discharged from the discharge port, the discharge port is configured to extend in the transfer direction and gradually widen from the upstream side to the downstream side in the transfer direction. By doing so, it is possible to suppress the discharge at the upstream side position of the discharge port in the transport direction and to easily discharge the transport target toward the downstream side, so that the discharge of the transport target can be dispersed along the transport direction, It is possible to reduce the drop impact when the conveyed object is dropped and discharged, and to reduce the compaction of the discharged conveyed object. (4) By providing the discharge port with an adjusting gate for adjusting the opening amount of the discharge port, the position at which the object to be conveyed is dropped and discharged can be freely changed along the conveying direction. Therefore, even if the transport amount of the transport target is increased, the transport target can be dispersed in the transport direction in a well-balanced manner and discharged, and further, the repose angle of the transport target to be dropped and discharged is formed. Since the peaks can be averaged in the transport direction, it is possible to effectively use the internal volume of the receiving container for the transport target provided on the downstream side of the discharge port.

[Brief description of drawings]

1 shows an embodiment of a screw conveyor of the present invention, (a) is a schematic side view of cutting, and (b) is (a).
FIG. 6 is a view taken in the direction of arrow AA in FIG.

FIG. 2 shows another embodiment of the present invention, in which (a)
Is a schematic side view of the cutting, and (b) is a view taken in the direction of the arrow BB of (a).

3A and 3B show an example of a conventional screw conveyor, in which FIG. 3A is a schematic plan view, and FIG.

[Explanation of symbols]

1 screw casing 2 entrance 3,3a, 3b, 3c, 3d outlet 4 screws 13 Transport target 15 Adjustment gate 18 outlet 18a opening 19 Adjustment gate

Claims (4)

[Claims] 1. A conveying method in which a screw is rotatably drivable in a screw casing having an inlet provided at an upper portion on one end side and an outlet provided at a lower portion on the other end side, and is fed into the screw casing from the inlet. In a screw conveyor configured to convey an object by the screw to be dropped and discharged from a discharge port, a configuration in which a plurality of discharge ports are provided at a required interval in the transport direction at a lower portion of the other end of the screw casing is provided. A screw conveyor characterized by having. 2. The screw conveyor according to claim 1, wherein an adjusting gate for adjusting an opening amount of each of the plurality of discharge ports provided at the other end of the screw casing is individually provided. 3. A conveying method in which a screw is rotatably drivably housed in a screw casing having an inlet provided at an upper portion on one end side and an outlet provided at a lower portion on the other end side, and the screw is fed into the screw casing through the inlet. In a screw conveyor configured to convey an object by the screw to drop and discharge from the discharge port, the discharge port has a shape extending in the transport direction and gradually widening from the upstream side to the downstream side in the transport direction. A screw conveyor having a structure. 4. The screw conveyor according to claim 3, wherein the discharge port is provided with an adjusting gate for adjusting the opening amount of the discharge port.