JP3335124B2 - Silo blade drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade driving device for a silo provided with rotating blades for discharging a fixed amount of a sewage sludge dewatered cake stored in a silo.

[0002]

2. Description of the Related Art In recent years, polymer-based dewatered cakes whose discharge from sewage treatment plants is increasing are high-viscosity cakes having a water content of 72 to 82%, and are sent to post-processes such as incineration and melting. Before being fed, it is stored in a square hopper called a fixed-quantity feeder. At the bottom of the hopper, a dispensing device for discharging the stored sewage sludge dewatered cake by a fixed amount is provided.

As a dispensing device, a screw type is generally used. However, the screw type dispensing device,
In order to cut out the dewatered cake evenly from the entire bottom surface of the hopper, a number of screws must be arranged, and there is a problem that the structure is complicated and the apparatus becomes expensive. Therefore, a rotating vane type silo dispensing device has been developed in which a rectangular hopper is formed into a circular silo shape, rotating blades are provided on the bottom surface of the silo, and the rotating force is used to push out the dewatered cake toward a discharge port on the bottom surface of the silo. ing.

[0004] However, in this rotary blade type, a large reduction gear and a motor must be installed at the center of the blade drive shaft in order to drive the rotary blade in the dewatered cake having a high viscosity, and the equipment cost is high. In addition, the delivery time is long, and there is a problem that a large space is required under the silo to install these large-sized devices.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, does not require a large reduction gear or a motor, can reduce the space under a silo, and has a high viscosity dehydration as before. The present invention has been made to provide a blade driving device for a silo that can drive rotating blades in a cake.

[0006]

According to a first aspect of the present invention, there is provided a drive disk having a blade drive shaft extending downward through a bottom surface of a silo, and a drive disk mounted thereon. A protrusion or recess is provided alternately at a constant pitch on the upper and lower surfaces, and these upper and lower protrusions or recesses are alternately pressed tangentially on the upper and lower sides of the drive disk to rotate the drive disk and the blade drive shaft. It is characterized in that means are provided. In the second invention, the blade driving shaft extends through the bottom surface of the silo and extends downward, and a driving disk is attached. The driving disk is provided with projections or recesses at a constant pitch, and beside the driving disk, It is characterized in that a pressing means is provided which can move forward while pressing these projections or recesses in the tangential direction to rotate the drive disk and the blade drive shaft, and which can retreat while avoiding interference with the projections or recesses. is there. It is preferable that the pressing head of the pressing means swings or moves up and down in order to avoid interference with the projection or the recess. It is also possible to enable the rotating blade to rotate backward with the driving disk. Further, a ratchet plate may be provided which swings the pressing head of the pressing means in a direction to avoid interference with the protrusion or the concave portion when the pressing head is retracted. Hereinafter, each invention will be described together with preferred embodiments thereof.

[0007]

(First Embodiment of the Invention) FIGS. 1 to 3 are views showing a preferred embodiment of the first invention. Reference numeral 1 denotes a cylindrical silo in which, for example, a high-viscosity sewage sludge dewatered cake using a polymer-based flocculant is stored. The bottom of the silo 1 is provided with a discharge port 2 and a rotary blade 3 for pushing out the dewatered cake toward the discharge port 2.

Reference numeral 4 denotes a blade drive shaft for rotating the rotary blade 3, and is supported by a sealed bearing 5 at the bottom of the silo 1. The blade drive shaft 4 extends downward through the bottom surface of the silo 1, and a drive disk 6 is attached to a lower end thereof. As shown in FIG. 2, the drive disk 6 is provided with projections or recesses 7, 8 at a constant pitch on the upper and lower surfaces of the outer peripheral portion. These projections or recesses 7 and 8 are provided alternately in the upper and lower directions, and in the example of FIG.
, And six projections are alternately provided on the lower surface.

As shown in FIG. 1, pressing means 9 and 10 are provided on the upper and lower two sides of the driving disk 6. These pressing means 9 and 10 are cylinders in this example, and are fixed to the bracket 11 on the bottom surface of the silo 1 so as to be tangential to the circumference where the projections or recesses 7 and 8 are provided. As described below, these pressing means 9,
10 can alternately press the upper and lower protrusions or recesses 7 and 8 of the drive disk 6 in a tangential direction to rotate the drive disk 6 and the blade drive shaft 4 fixed thereto.

FIG. 3 is an explanatory diagram of the operation of the device of the first invention configured as described above. First, the upper pressing means 9 advances the piston rod from the state described above, and presses the protrusion or recess 7 on the upper surface of the driving disk 6 by one pitch to the position. As a result, the drive disk 6 and the blade drive shaft 4 fixed thereto are rotated by 30 °. At this time, the lower pressing means 1
The zero piston rod is in the retracted position. Thereafter, the piston rod of the upper pressing means 9 returns to the state shown in FIG.

When the upper surface of the driving disk 6 is in the state, the lower surface of the driving disk 6 is in the state. Then, the lower pressing means 10 advances the piston rod to push the protrusion or recess 8 on the lower surface of the driving disk 6 by one pitch to the position of. As a result, the drive disk 6 and the blade drive shaft 4 fixed thereto are further rotated by 30 °. At this time, the piston rod of the upper pressing means 9 is at the retracted position. Thereafter, the piston rod of the lower pressing means 10 is retracted to the state.

In the above description, the operation of the upper pressing means 9 and the lower pressing means 10 have been described in order to make the procedure easier to understand.
The operation has been described separately. However, in practice, in order to achieve continuous rotation, the upper pressing means 9 starts advancing the lower pressing means 10 just before pushing down one pitch, and the lower pressing means 10 pushes the upper pressing means 9 just before pushing out one pitch.
Is preferably started.

As described above, in the present invention, the blade drive shaft 4 and the rotary blade 3 are rotated by pressing the protrusions or recesses 7, 8 provided at a constant pitch on the outer peripheral portion of the drive disk 6 in a tangential direction. Therefore, a large rotational moment can be obtained without increasing the pressing force of the pressing means 9 and 10 too much. For this reason, a space under the silo can be reduced without requiring a large reduction gear or motor as in the related art. Furthermore, since the pressing means 9 and 10 are installed under the silo, maintenance and replacement are easy. Moreover, in the present invention, the upper and lower protrusions or recesses 7 and 8 are alternately pressed by the upper and lower two-stage pressing means 9 and 10, so that the protrusions or recesses 7 and 8 and the piston rod are prevented from interfering with each other smoothly. The driving disk 6 can be rotated at the same time.

(Embodiment of the Second Invention) FIGS. 4 and 5 are views showing a preferred embodiment of the second invention. In the second invention, the protrusions or recesses 20 are provided at a constant pitch only on one surface of the driving disk 6. A single pressing means 21 for pressing these protrusions or recesses 20 in a tangential direction is provided on the side of the driving disk 6. However, in this case, when the pressing means 21 retreats the advanced piston rod, interference with the next projection or recess 20 may occur.

Therefore, an appropriate head turning means 22 is incorporated in the pressing means 21, and the pressing head 23 at the tip of the piston rod is tilted in the direction of the projection or the concave portion 20 as shown in FIG. Alternatively, it can be raised in a direction away from the recess 20. Then, as shown in FIG. 4, the pressing head 23 is tilted in the direction of the protrusion or the concave portion 20 to move forward, and the driving disc 6 is rotated.
5 is raised in the direction away from the projection or the recess 20 as shown in FIG. 5 so as to be retracted while avoiding interference with the projection or the recess 20.

As described above, in the second invention, the driving disk 6 can be rotated by the single pressing means 21.
In addition, a large rotating moment can be obtained without increasing the pressing force of the pressing means 21 too much, a large reduction gear and a motor are not required unlike the related art, and the space under the silo can be reduced. The same operation and effect as those of the first invention can be obtained, such as ease of replacement and replacement.

In the present invention, since the rotating blades 3 for pushing out the dewatered cake are provided at the bottom of the silo 1, foreign matter in the dewatered cake may bite on the lower surface of the rotating blade 3 and the rotating blade 3 may not be able to rotate. . In such a case, if the pressing means 21 is pulled back while the pressing head 23 is engaged with the projection or the concave portion 20 as shown in FIG. 4, the rotating blade 3 can be forcibly rotated in the reverse direction. As a result, it becomes possible to move the caught foreign matter and remove it from the lower surface of the rotary blade 3.

(Other Embodiment of Second Invention) FIGS. 6 to 8
FIG. 8 is a view showing another embodiment of the second invention. In this embodiment, a pin-shaped pressing head 23 is attached to the tip of a single pressing means 21. The upper flange 24 of the pressing head 23 is slidably fitted in the rail guide 25. An elevating cylinder 26 and a guide rod 27 are provided above the rail-shaped guide 25, and the pin-shaped pressing head 23 can be moved up and down at an arbitrary position.

For this reason, as shown in FIG. 7, the pin-shaped pressing head 23 is lowered to engage with the projection or recess 20 of the driving disk 6, and the pressing means 21 presses the same as in the other embodiments.
The driving disk 6 can be rotated by the pitch. Then, as shown in FIG. 8, the pin-shaped pressing head 23 is lifted by the lifting cylinder 26 together with the rail-shaped guide 25, the pressing means 21 is returned to the state shown in FIG. 7, and the cycle of lowering the pressing head 23 is repeated. 6 can be rotated. However, when a foreign matter is caught on the lower surface of the rotary blade 3, the pressing means 21 may be pulled back while the pin-shaped pressing head 23 is lowered.

FIGS. 9 and 10 show still another embodiment of the second invention. Here, the pressing head 23 is of a swinging type, and the rail-shaped guide 25 is moved up and down by an elevating cylinder 26 so that the pressing head 23 as shown in FIG.
Can be engaged with or disengaged from the projection or recess 20 of the driving disk 6. In this case, the pressing head 2
It is necessary to allow the relative movement in the radial direction between the protrusion 3 and the projection or the concave portion 20. In this example, the concave portion 20 is a groove extending in the radial direction of the driving disk 6. In this embodiment as well, if the pressing head 23 is separated from the projection or the concave portion 20 of the driving disk 6 when the pressing means 21 returns, normal rotation in one direction is possible. Presses into the pressing head 2
If the pressing means 21 is pulled back 4 while the engaging disk 3 is engaged with the projection or the concave portion 20 of the driving disk 6, the rotating blade 3 can be rotated backward together with the driving disk 6.

FIGS. 11 to 16 show still another embodiment of the second invention. In this embodiment, the pressing means 2
A ratchet plate 30 is attached to one pressing head 23. The ratchet plate 30 is pivotally attached to a vertical side plate 31 attached to the pressing head 23 so as to be swingable only on one side by a horizontal shaft 32. Ratchet board 3
The height of 0 is a height at which the protrusion 20 of the driving disk 6 can be pressed. The vertical side plate 31 is provided with an arm 33 extending to the side, and a rod 34 attached to the arm 33 is slidably penetrated through a bracket 35 on the fixed side so as to be prevented from rotating.

In this embodiment, as shown in FIG. 13, when the pressing head 23 of the pressing means 21 moves forward, the central portion 36 of the pressing head 23 comes into contact with the back surface of the ratchet plate 30. While maintaining the posture, the projection 20 of the driving disk 6 is pressed to rotate the driving disk 6. Note that the stroke S is about twice the pitch of the projection 20. Next, the pressing head 23 of the pressing means 21
Is retracted, the ratchet plate 30 escapes rightward in the figure as shown in FIG. Therefore, the pressing head 23 can return while riding over the projection 20 in the middle.

As shown in FIG. 15, when the number of pressing means 21 is one, it is possible to approach continuous rotation by increasing the return speed. However, more preferably, as shown in FIG. 16, if two pressing means 21 are provided and they are operated alternately, continuous rotation is possible. In this case, the ratchet plate 30 can return while easily climbing over the moving projections 20, so that a smooth operation is possible.
Further, even if the position of the projection 20 is slightly shifted for some reason, the driving disk 6 can be rotated without any trouble.

[0024]

As described above, according to the present invention, the rotating blades can be driven in a high-viscosity dewatered cake without the need for a conventional large speed reducer or motor. In addition, the space under the silo can be reduced, maintenance and replacement of the pressing means can be facilitated, and many advantages can be obtained, such as being able to cope with the case where foreign matter is caught.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the first invention.

FIG. 2A is a plan view of a drive disk according to the first invention, and FIG. 2B is a front view thereof.

FIG. 3 is an explanatory view of the movement of the pressing means according to the first invention, wherein “a” denotes an upper surface of the driving disk and “a” denotes a lower surface of the driving disk.

FIGS. 4A and 4B are explanatory views of the pressing means in the second invention at the time of forward movement, wherein FIG. 4A is a plan view and FIG. 4B is an enlarged side view.

FIGS. 5A and 5B are explanatory views of the pressing means in the second invention at the time of retreating, wherein FIG. 5A is a plan view and FIG. 5B is an enlarged side view.

FIG. 6 is a plan view showing another embodiment of the second invention.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a front view of the pressing means when it is moving forward.

FIG. 9 is a plan view showing still another embodiment of the second invention.

FIG. 10 is a front view illustrating the operation.

FIG. 11 is a perspective view showing a main part of still another embodiment of the second invention.

FIG. 12 is a plan view thereof.

FIG. 13 is a front view of the pressing means in a forward state.

FIG. 14 is a front view of the pressing unit in a retracted state.

FIG. 15 is a plan view when one pressing unit is used.

FIG. 16 is a plan view when two pressing units are used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Silo, 2 outlet, 3 rotating blades, 4 blade drive shaft, 5 bearing, 6 drive disk, 7 protrusion or recess, 8
Projection or recess, 9 pressing means, 10 pressing means, 11
Bracket, 20 protrusion or recess, 21 pressing means, 2
2 Head turning means, 23 Press head, 24 Flange, 25 Rail guide, 26 Elevating cylinder, 2
7 Guide rod, 30 ratchet plate, 31 vertical side plate, 32 horizontal axis, 33 arm, 34 rod, 35
Bracket, 36 center of pressure head

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C02F 11/00 B01J 4/02 B65G 65/48

Claims (5)

(57) [Claims] 1. A driving disk is attached by extending a blade driving shaft through a bottom of a silo and extending downward, and projections or recesses are alternately provided on the upper and lower surfaces of the driving disk at a constant pitch. A blade driving device for a silo, wherein a pressing means for rotating the driving disk and the blade driving shaft by alternately pressing these upper and lower protrusions or concave portions in a tangential direction is provided on a side. 2. A driving disk is attached by extending a blade driving shaft through the bottom of the silo and extending downward, and a projection or a concave portion is provided on the driving disk at a constant pitch. While pushing forward the projection or recess in the tangential direction and rotating the drive disk and blade drive shaft,
A silo blade drive device comprising a pressing means capable of retreating while avoiding interference with a projection or a concave portion. 3. The silo blade drive device according to claim 2, wherein the pressing head of the pressing means swings or moves up and down in order to avoid interference with the projection or the concave portion. 4. The silo blade drive according to claim 2, wherein the pressing head of the pressing means is engaged with a projection or a concave portion of the driving disk so that when the pressing means moves backward, the rotating blade can be rotated backward with the driving disk. apparatus. 5. The silo blade drive device according to claim 2, wherein the pressing head of the pressing means includes a ratchet plate that swings in a direction to avoid interference with the projection or the concave portion when the pressing means retreats.