JP3615597B2 - Rotary sieve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary sieving apparatus that sorts bulk materials such as coal into particle sizes suitable for each application.
[0002]
[Prior art]
The so-called bulk materials include coal, iron ore, grains, and the like. In the types and certain processes, it is necessary to sort the bulk materials into particle sizes suitable for each application.
[0003]
In particular, the need for coal as fuel for thermal power plants is high. Coal is a solid combustible rock that has been produced by depositing past plant bodies, undergoing a decomposition reaction, and receiving geothermal and alteration effects in the ground. Its distribution is global and the reserves are enormous. Therefore, it is a precious fossil fuel left in the future of mankind even compared to oil whose distribution area is unevenly distributed and is feared to be depleted in the near future. In addition, coal has a long history as a fossil fuel, and is now used in a wide variety of fields, including combustion, gasification, and liquefaction. However, due to the recent shortage of resources and environmental pollution problems, the focus is on how to efficiently use fuel and how to take measures against environmental pollution. Therefore, in a thermal power plant using coal as a fuel, before coal is burned in a boiler, the coal is selected through a sieve so that the particle size is suitable for the power generation.
[0004]
FIG. 3 is a side view showing a conventional coal sieving apparatus. The sieving device 11 has a box shape with an upper surface and a front surface open, and has a sieve 3 having holes or slits on the lower surface, a carry-in conveyor 12 for transporting coal 5 into the sieve 3, and a sieve 3. A sieve support 14 supported via a spring 13, a motor 15 provided on the sieve support 14 and vibrating the sieve 3, a hopper 16 that receives the coal 6 that has passed through the sieve 3, and discharged from the hopper 16 Unloading conveyor 17 that unloads the selected coal 6, a remaining coal hopper 18 that receives coal (residual coal) 7 that does not pass through the sieve 3, and a residue that unloads the remaining coal 7 discharged from the remaining coal hopper 18. A charcoal carry-out conveyor 19, and by using the vibration of the motor 15 and the elastic force of the spring 13, the sieve 3 vibrates vertically and horizontally so as to form an elliptical orbit, and the coal 6 passing through the sieve 3 Select the remaining coal 7 that does not pass It was.
[0005]
[Problems to be solved by the invention]
However, in the above-described sieving apparatus, since the sieve was operated up and down and left and right, vibration and noise were severe. In addition, a large motor is required for the vibration of the sieve, and the distance from the carry-in of the bulk material to the carry-out (the length of the sieve) is long, so the apparatus becomes large and takes up space. In addition, there are problems such as high production costs and heavy weight.
[0006]
The present invention has been made to solve the above-described problems. That is, an object of the present invention is to provide a rotary sieving device capable of suppressing vibration and noise of the device and reducing the weight and size of the device.
[0007]
[Means for Solving the Problems]
According to the present invention, a circular truncated cone having a hole or a slit on the circumferential surface is horizontally arranged, the large diameter side is opened and the small diameter side is closed, and is driven to rotate around the rotation axis. A rotary sieving device having a sieve support roller having a sieve support roller for supporting a ring on the large-diameter side from below , and surrounding loose material introduced from the large-diameter side through the inside to the small-diameter side. There is provided a rotary sieving apparatus characterized in that the sieving is carried out while being lowered along the surface, and the bulk material that does not pass through the holes or slits of the sieve is discharged from the large diameter side.
[0008]
Further, by inclining the rotation axis of the sieve, the residence time can be adjusted in accordance with the properties of the bulk material.
[0009]
The present invention intends to suppress vibration and noise by rotating a sieve instead of vibrating it when a bulk material is passed through the sieve. In this way, by using a rotary sieve device, the driving force for operating the sieve can be reduced, so that a drive source such as a motor can be reduced in size, and the device can be reduced in weight and size. Connected. Further, by reducing the vibration of the apparatus, it is possible to reduce the weight and size of the sieve and its supporting member.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIG. 1 and FIG. In addition, the same code | symbol is attached | subjected to the part which is common in the past, and the overlapping description is abbreviate | omitted.
[0011]
FIG. 1 is a side view of the rotary sieving device of the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG. In one embodiment, the rotary sieve device shown in these figures has a particle size suitable for power generation before burning coal in a boiler in a thermal power plant using coal as fuel. What is used when selecting coal through a sieve will be described.
[0012]
As shown in FIG. 1 and FIG. 2, the rotary sieve device has a shape in which a circular truncated cone having a slit 1 on the peripheral surface is disposed horizontally, the large diameter side is opened, and the small diameter side is a gear. 21 is a rotary sieving device 4 having a sieve 3 which is closed and protrudes from a small diameter side and is driven to rotate around a rotary shaft 2, and which surrounds coal 5 charged to the small diameter side. The coal 6 passing through the slit 1 of the sieve 3 is discharged from a hopper 16 provided below the sieve 3 and the coal 7 not passing through the slit 1 of the sieve 3 is on the large diameter side. It is discharged from the remaining charcoal discharge slide 22 provided in
[0013]
In this sieve 3, a plurality of plate-like members 24 are attached with desired gaps so as to connect the ring 23 on the large diameter side and the gear 21, and the gaps serve as slits 1. Therefore, by changing the gap between the plate-like members 24, the width of the slit 1 can be changed, and coal having a required particle size can be easily selected. It should be noted that a plurality of arms may be fitted on the outer surface of the plate-like member 24, holes may be provided on the peripheral surface of the sieve instead of the plate-like member 24, and a wire mesh is stretched. May be.
[0014]
The sieve 3 is rotationally driven by a drive source 26 having a gear 25 that meshes with the gear 21 on the small diameter side, the rotating shaft 2 of the sieve 3 is supported by a bearing 27, and the ring 23 on the large diameter side is a pair of sieves. It is supported by a sieve support base 14 having a receiving roller 28. Therefore, the sieve 3 can be rotated smoothly, and the vibration and noise can be reduced. The drive source 26 includes a motor 15 and a speed reducer 29.
[0015]
Further, the remaining coal discharge slide 22 is provided so as to expand from the ring 23 on the large diameter side so that the coal 7 that does not pass through the slit 1 of the sieve 3 is smoothly discharged to the remaining coal carry-out conveyor 19. It has become. Since the coal 7 that does not pass through the slit 1 of the sieve 3 is gathered downward by gravity, the residual coal discharge slide 22 is placed on the sieve support base 14, not on the large-diameter side ring 23, below the sieve 3. You may provide so that only this part may be covered.
[0016]
As shown in FIG. 1 and FIG. 2, the pulverized coal 5 having various particle sizes is conveyed from the large diameter side of the sieve 3 to the small diameter side through the inside by the carry-in conveyor 12 and is put into the sieve 3. By the rotation of the sieve 3, the pulverized coal 5 containing various particle sizes is sieved while descending along the peripheral surface of the sieve 3, and the coal 6 that has passed through the slit 1 of the sieve 3 is provided below the sieve 3. The discharged hopper 16 is discharged and conveyed to a predetermined position by the carry-out conveyor 17. On the other hand, the coal 7 that does not pass through the slit 1 of the sieve 3 is discharged from the residual coal discharge slide 22 and is transported to a crusher device (not shown) by the residual coal discharge conveyor 19. Therefore, the coal thrown into the sieve 3 is pulled up in the rotational direction along the peripheral surface of the sieve 3 and descends from the small diameter side to the large diameter side while repeating the movement of collapsing in the middle. It is possible to sufficiently take a distance necessary for selecting the selected coal, and to shorten the distance (the length of the sieve) from the coal loading to the unloading of the remaining coal.
[0017]
According to the rotary sieve device 4 of the present invention described above, the residence time can be easily adjusted according to the size and properties of the coal by changing the rotational speed of the sieve 3 and the inclination angle of the rotary shaft 2. Can be selected.
[0018]
In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.
[0019]
【The invention's effect】
As described above, according to the rotary sieving device of the present invention, when a bulk material is passed through a sieve, the sieve can be smoothly operated by rotating the sieve instead of vibrating it. Vibration and noise can be suppressed. Moreover, since the driving force for operating the sieve can be saved by using the rotary type, the driving source such as a motor can be reduced in size, and the device can be reduced in weight and size. . Furthermore, since the distance from the carry-in of bulk material to the carry-out (the length of the sieve) can be shortened, the apparatus can be miniaturized.
[0020]
Further, by reducing the vibration of the apparatus, it is possible to reduce the weight and size of the sieve and its supporting member.
[0021]
Moreover, it has an excellent effect that the retention time can be easily adjusted and selected in accordance with the size and property of the bulk material by simply changing the rotation speed of the sieve and the inclination angle of the rotation shaft.
[Brief description of the drawings]
FIG. 1 is a side view of a rotary sieve device of the present invention.
FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a side view showing a conventional coal sieving device.
[Explanation of symbols]
1 Slit 2 Rotating shaft 3 Sieve 4 Rotating sieve device 5 Bulk material (coal)
6 Coal that has passed through the slit 7 Coal that has not passed through the slit (residual coal)
DESCRIPTION OF SYMBOLS 11 Sieve apparatus 12 Carry-in conveyor 13 Spring 14 Sieve support stand 15 Motor 16 Hopper 17 Unloading conveyor 18 Remaining charcoal hopper 19 Remaining charcoal carry-out conveyors 21 and 25 Gear 22 Remaining charcoal slide 23 Ring 24 Plate member 26 Drive source 27 Bearing 28 Sieve receiver Roller 29 Reducer

Claims (2)

A rotary type having a hollow and a circular truncated cone having a hole or a slit on the peripheral surface, the large-diameter side being opened and the small-diameter side being closed, and having a sieve that is driven to rotate around the rotation axis A sieving device,
It has a sieve support base that has a sieve receiving roller and supports the ring on the large diameter side from below,
Rotation characterized in that the bulk material thrown into the small diameter side through the inside from the large diameter side is sieved while being lowered along the peripheral surface, and the bulk material that does not pass through the holes or slits of the sieve is discharged from the large diameter side. Type sieve device. The rotary sieve device according to claim 1, wherein the residence time can be adjusted in accordance with the properties of the bulk material by inclining the rotation axis of the sieve.

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