JP4277299B2 - Screw conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a screw conveyor that conveys a low water content clay such as dredged material while thawing.
[0002]
[Prior art]
Conventionally, low water content clay generated by dredging etc. is put into a plurality of mud tanks, and it is intended to be reused by carrying out thaw work using heavy equipment such as backhoes and skeleton buckets while pouring water into them. In addition, the clay is fluidized in order to suitably perform the operation of removing contaminants such as gravel, ropes, sheets and the like using a vibrating sieve.
[0003]
However, such conventional thawing work cannot be performed with a large capacity due to the size of the mud tank and the length of the backhoe arm. Since the mud and clay supply are alternately performed in a batch system, there is a problem that the equipment becomes large for the capacity.
[0004]
In view of this, there has been provided a method capable of treating a large volume of low water content clay even with a small scale facility by continuously performing a thawing operation using a screw conveyor as shown in FIG.
[0005]
The screw conveyor 1 includes a cylindrical casing 2 having a cylindrical shape or a U-shaped cross section, a drive transmission shaft 3 rotatably supported in the casing 2, and a spiral shape supported on the outer periphery of the drive transmission shaft 3. A screw 4 and a drive device 5 for rotating the drive transmission shaft are provided. By operating the drive device 5, the screw 4 supported by the drive transmission shaft 3 is rotated. The introduced transported material such as low water content clay is transported to the discharge port 2b (see, for example, Patent Document 1 and Patent Document 2).
[0006]
[Patent Document 1]
JP 2002-321812 A [Patent Document 2]
JP 09-315548 A
[Problems to be solved by the invention]
However, in the conventional screw conveyor as described above, when the low water content clay contains many impurities such as gravel, ropes, sheets, etc., the screw bites these impurities and the rotation of the screw stops. There was a problem that there was a risk of being.
[0009]
In view of such a state of the prior art, the present invention allows a screw to smoothly process even if it is a low water content clay containing a large amount of contaminants such as gravel, rope, sheet, etc., without the screw biting in the contaminants. It aims at providing the screw conveyor which can do.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems and achieve the intended object, the invention of claim 1 is a cylindrical casing, a drive transmission shaft rotatably supported in the casing, and the drive transmission. is disposed on the outer peripheral side of the shaft, a spiral screw that rotates in conjunction with the drive transmission shaft, and a driving device for rotating the drive transmission shaft, the outer periphery of the screw, the inner peripheral surface of the casing A screw conveyor in which the screw rotation center is freely displaceable with respect to the axial center of the casing , and the screw is a ribbon screw, and the inner periphery of the ribbon screw and the outer periphery of the drive transmission shaft The ribbon screw is disposed on the outer peripheral side of the drive transmission shaft in a state where a sufficient gap is formed between the ribbon screw and the drive transmission shaft. The ribbon screw is rotated at the center of rotation of the drive transmission shaft by being connected to the shaft via a flexible linear material inclined in the direction of the central axis of the drive transmission shaft. It is characterized by being displaceable with respect to the center .
[0011]
By configuring in this way, it becomes possible to process large-capacity low water content clay with a small-scale facility, and even if the low water content clay contains impurities such as gravel, rope, sheet, etc. Since the screw does not bite these impurities and the operation is not interrupted, the operation can be performed smoothly.
[0012]
In addition, the screw avoids impurities and the restoring force resulting from the avoidance causes the screw to vibrate up and down as it rotates. Figured.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a screw conveyor according to the present invention will be described with reference to the drawings.
[0022]
FIG. 1 shows a screw conveyor according to the present invention.
[0023]
The screw conveyor 10 includes a cylindrical casing 11, a drive transmission shaft 12 rotatably supported in the casing 11, a spiral ribbon screw 13 that rotates in conjunction with the drive transmission shaft 12, and a drive transmission shaft 12. And a ribbon screw 13 that is linked to the drive transmission shaft 12 by rotating the drive device 14, and the low-water-content clay is stirred by the rotation of the ribbon screw 13. It is designed to be transported together.
[0024]
The casing 11 is formed in a cylindrical shape whose both end faces are closed by end plates 15 and 15 by a relatively hard material such as cast iron.
[0025]
An opening 16 is formed at one end of the casing 11, i.e., the transport base end, and opens upward, and communicates with the inside of the casing 11. The other end, i.e., the transport end, opens downward. A discharge port 17 communicating with the inside of the casing is formed.
[0026]
Further, bearings 18 and 18 that rotatably support the end of the drive transmission shaft 12 are provided at the center of both end plates 15 of the casing 11.
[0027]
The drive device 14 includes an electric motor 19, and the rotation of the electric motor 19 is transmitted to the drive transmission shaft 12 by a chain belt 20 or the like so that the drive transmission shaft 12 is rotated.
[0028]
The ribbon screw 13 is formed in a spiral shape using a relatively soft material as compared with the casing, and a sufficient gap is formed between the inner periphery of the ribbon screw 13 and the outer periphery of the drive transmission shaft 12. The outer peripheral side of the drive transmission shaft 12 is disposed.
[0029]
Further, the outer periphery of the ribbon screw 13 is formed smaller than the inner peripheral surface of the casing, and a gap is formed between the outer periphery of the ribbon screw 13 and the inner peripheral surface of the casing 11.
[0030]
Ribbon screw 13 is adapted to interlock with the rotation of the drive transmitting shaft 12 via a plurality of drive transmission member 21, 21 ... of the tilted orientation relative to the central axis of the drive transmission shaft, the center of rotation Is freely displaceable in the rotational radius direction with respect to the rotational axis of the drive transmission shaft 12. Therefore, the center of rotation of the ribbon screw 13 is also displaceable in the direction of the radius of rotation with respect to the axial center of the casing 11, that is, the center axis of the cylinder.
[0031]
The drive transmission member 21 is formed of a flexible linear material such as a chain or a wire rope, and has one end fixed to the outer peripheral surface of the drive transmission shaft 12 so as to be loose when it is not operated. The other end is fixed to the inner periphery of the ribbon screw 13.
[0032]
The attachment direction of the linear member 21 is such that the end of the ribbon screw is upstream of the end of the shaft with respect to the end of the shaft so that the reaction force of the clay generated by the rotation of the ribbon screw 13 can be countered. Place on the side.
[0033]
As shown in FIG. 2, the rotation center of the ribbon screw 13 is usually positioned below the axial center of the casing 11 due to the weight of the ribbon screw 13, and the rotation causes the low water content clay to be conveyed while stirring and homogenizing. To do.
[0034]
However, gravel to its low water content in the clay, the rope, if it contains contaminants a sheet or the like, as shown in FIG. 3, the ribbon screw 13 is pushed up by the contaminants a, its rotational center casing Therefore, the ribbon screw 13 does not bite the contaminants a and can be prevented from stopping rotating.
[0035]
In addition, the ribbon screw 13 returns to the state shown in FIG. 2 due to the weight of the ribbon screw and the restoring force resulting from the displacement after overcoming the contaminant a. That is, it rotates while repeating displacement up and down.
[0036]
Therefore, by repeating this displacement behavior between the upper and lower sides, a shearing action and a crushing action work suitably, and the low water content clay is suitably agitated, homogenized and dehumidified.
[0037]
As shown in FIG. 4, a plurality of ribbon screws 25, 25... Formed in a short length are arranged at intervals in the rotation center direction with respect to the drive transmission shaft 12, and each ribbon screw 25 operates independently. You may be able to do it.
[0038]
At this time, it is preferable that the adjacent ribbon screws 25 and 25 are arranged so that the spiral shape is continuous with an interval.
[0039]
In the above-described embodiment, the example in which the drive transmission member 21 made of a linear material is attached so that the end on the ribbon screw side is disposed on the upstream side in the transport direction with respect to the end on the shaft side has been described. The relative distance in the conveying direction between the ribbon screw side end of the drive transmission member 21 and the shaft side end is shortened, and the ribbon screw side end and the shaft side end are arranged at or near the rotational radius of the ribbon screw. You may do it.
[0040]
Next, another example of the screw conveyor according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned Example, and description is abbreviate | omitted.
[0041]
The screw conveyor 30 includes a cylindrical casing 11, a drive transmission shaft 31 rotatably supported in the casing 11, spiral screws 32, 32... Rotating in conjunction with the drive transmission shaft 31, and drive transmission. A drive device that rotates the shaft 31, and by operating the drive device, the screws 32, 32... Interlocked with the drive transmission shaft 31 are rotated, and the low water content ratio introduced by the rotation of the screws 32, 32. The clay is transported while stirring and homogenizing.
[0042]
The drive transmission shaft 31 is formed by dividing a plurality of divided shafts 33, 33,...
[0043]
The screw 32 is formed in a spiral shape and is supported on the outer periphery of each divided shaft 33.
[0044]
In the screw conveyor 30, when the low water content clay to be conveyed contains a contaminant a such as gravel, rope, or sheet, the screw 32 and the divided shaft 33 are pushed up by the contaminant a, and the center of rotation thereof Is displaced above the axial center of the casing 11 to avoid the foreign matter a.
[0045]
Next, an operation experiment of the screw conveyor according to the present invention will be described.
1. Experiment (1)
Low-moisture content drained from each screw conveyor by introducing undisturbed grab clay (1% wt water) containing shells and gravel with a water content of 120% into the screw conveyor according to the present invention and the conventional screw conveyor, respectively. The state of specific clay was compared.
[0046]
In the case of using a conventional screw, a small clay lump remains even after being discharged from the screw conveyor, and clogging occurs when the clay that has been subjected to the mud removal treatment by the screw conveyor is applied to a vibrating sieve of 10 mm mesh. It stayed on the mesh.
[0047]
On the other hand, when a ribbon screw is used as in the present invention, the clay that has been defrosted to a state where there is no small clay lump and similarly subjected to the demudation treatment by a screw conveyor is applied to a vibrating sieve of 10 mm mesh. It was confirmed that only shells and gravel remained on the mesh, and that it was able to thaw into almost homogeneous fluid clay.
2. Experiment (2)
Low moisture content clay added with impurities such as gravel, rope, sheet, etc. was added to the screw conveyor according to the present invention and the conventional screw conveyor, respectively, and the operating conditions were compared.
[0048]
In the case of using a conventional screw, there was a scene in which the screw bites in foreign matter and the rotation of the screw stops.
[0049]
On the other hand, when the ribbon screw was used as in the present invention, rotation was not stopped due to the ribbon screw biting in the impurities, and it was confirmed that these impurities were discharged from the discharge port.
[0050]
【The invention's effect】
As described above, the screw conveyor according to the present invention can process a large-capacity low water content clay with a small-scale facility by being able to perform continuous work, and the rotation center of the screw with respect to the axis of the casing. By making it freely displaceable, even if the low water content clay contains impurities such as gravel, ropes, sheets, etc., these impurities will not be caught by the screw, and work will not be interrupted. Therefore, it can work smoothly.
[0051]
In addition, the screw avoids impurities and the restoring force resulting from the avoidance causes the screw to vibrate up and down as it rotates, so that the low water content clay has a shearing action and a crushing action, and is suitably stirred and homogenized. Figured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a screw conveyor according to the present invention.
FIG. 2A is a partially enlarged cross-sectional view showing the operating state of the above, and FIG. 2B is a cross-sectional view taken along the line AA.
FIG. 3A is a partially enlarged cross-sectional view showing an operation state when the above-described foreign matter is present, and FIG. 3B is a cross-sectional view taken along the line BB in FIG.
FIG. 4 is a cross-sectional view showing another example of a screw conveyor according to the present invention.
FIG. 5 is a cross-sectional view showing another example of the above.
FIG. 6 is a cross-sectional view showing an example of a conventional screw conveyor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Screw conveyor 11 Casing 12 Drive transmission shaft 13 Ribbon screw 14 Drive device 15 End plate 16 Input port 17 Discharge port 18 Bearing 19 Electric motor 20 Chain belt 21 Drive transmission member 25 Ribbon screw 30 Screw conveyor 31 Drive transmission shaft 32 Screw 33 Split shaft 34 universal joints

Claims (1)

A cylindrical casing, a drive transmission shaft rotatably supported in the casing, a helical screw disposed on the outer peripheral side of the drive transmission shaft and rotating in conjunction with the drive transmission shaft, and the drive and a driving device for rotating the transmission shaft, and an outer periphery of the screw, provided with a gap between the inner peripheral surface of the casing, so that the rotation center of the screw is freely displaceable with respect to the axis of the casing In the screw conveyor
The screw is a ribbon screw, and in a state where a sufficient gap is formed between the inner periphery of the ribbon screw and the outer periphery of the drive transmission shaft, the screw is disposed on the outer periphery side of the drive transmission shaft,
The ribbon screw is connected to the drive transmission shaft via a flexible linear member in a direction inclined with respect to the central axis direction of the drive transmission shaft. A screw conveyor characterized in that the rotation center is freely displaceable with respect to the rotation center of the drive transmission shaft .

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