JP2978466B2 - 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 having a swinging blade for discharging contents.

[0002]

2. Description of the Related Art For example, a sewage sludge dewatered cake generated from a sewage treatment plant is stored in a hopper before being sent to a process such as incineration or melting, and is cut out from the bottom thereof by a predetermined amount. Conventionally, a screw feeder has been used for cutting out from such a hopper, but a large number of screw feeders are required to cut out the contents uniformly from the entire bottom surface of the hopper. For this reason, silos have also been developed in which the hopper is formed in a cylindrical silo shape, and rotating blades provided inside the hopper are rotated in one direction so that uniform contents can be cut out from the entire bottom surface.

However, in order to drive the rotating blades inside a highly viscous sewage sludge dewatering cake or the like, it is necessary to attach a large and powerful reducer or motor to the blade main shaft, which greatly increases the equipment cost. There was a problem. Also,
Since such a rotating blade is rotated at a position close to the bottom plate of the silo, a sewage sludge dewatering cake or the like may bite between the rotating blade and the bottom plate of the silo. There is a problem that it takes a lot of trouble for.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can drive a swinging blade without the need for a large reduction gear or a motor. The present invention has been made to provide a silo blade drive device having a simple structure.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The present invention has been made to solve the above-mentioned problem by providing the contents at the upper end of a blade main shaft which penetrates a bottom plate of a silo downward .
Attaching the swinging blade to cut out evenly from
A large-diameter gear is attached to the lower end of the blade main shaft, and a rack meshing with the gear is reciprocated by a drive cylinder, whereby the rocking blade is rocked within a certain angle range on the discharge hole. Things. Note that the swing angle of the swing blade is preferably 180 ° or more.

According to the silo blade driving device of the present invention,
The reciprocating rack that meshes with the large-diameter gear of the blade spindle reciprocates with the drive cylinder to swing the blade spindle. Can be driven. Further, since the drive source is a single drive cylinder, the structure is simple and the equipment cost is low. In addition, the oscillating blade is a silo
Since the rocking motion occurs within a certain angle range on the discharge hole of the bottom plate , biting trouble hardly occurs, and even if biting occurs, the trouble can be naturally resolved by rocking in the opposite direction.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the embodiment, and FIGS. 2 and 3 are plan views. In these figures, 1 is a cylindrical silo for storing sewage sludge dewatering cake and the like,
2 is a bottom plate, and 3 is a bearing attached to the bottom plate 2. A blade main shaft 4 that penetrates the bottom plate 2 is supported by the bearing 3, and a swinging blade 5 is fixed to an upper end thereof. The oscillating blades 5 are for uniformly cutting contents such as sewage sludge dewatered cake stored in the silo 1 from the discharge holes 6 of the bottom plate 2. The number of the swinging blades 5 is not particularly limited, but generally 2 to 4 blades are appropriate. In the illustrated example, two blades are used.

A large-diameter gear 7 is fixed to the lower end of the blade main shaft 4. In the present specification, the large diameter is a relative one, and does not mean an absolute size. However, in order to obtain a sufficient oscillating torque, it is preferable that the large-diameter gear 7 has a diameter equal to or more than 1/3 of the oscillating blade 5. As the diameter of the gear 7 decreases, the load on the drive source increases as in the conventional case.

The large-diameter gear 7 has a drive cylinder 8
The rack 9 reciprocated by the gears is engaged. The drive cylinder 8 is, for example, a hydraulic cylinder having a sufficiently long stroke, and reciprocates the rack 9 to swing the swing blade 5 within a certain angle range as shown in FIGS. The swing angle is 180 ° or more, preferably 190 to 200 °.

The reason is that if the swing angle is 180 ° or more, even if the swing blade 5 is a two-blade blade, it can reliably cross over the discharge hole 6 and any position in the silo bottom surface This is also to prevent the swinging blade 5 from swinging and to form a dead zone in the silo. When the blade main shaft 4 is rotated by the drive cylinder 8 in this manner, the swing blade 5 swings within a certain angle range, and the contents such as the sewage sludge dewatering cake inside the silo 1 are discharged from the bottom plate 2. It is cut out evenly from the hole 6.

As described above, the apparatus of the present invention can swing the blade main shaft 4 with a large torque with a simple structure using a single drive cylinder 8, and can reduce the size of a conventional large reduction gear or motor. do not need. In addition, since the swinging blade 5 repeatedly swings within a certain angle range, the lower surface of the swinging blade 5 is hardly caught by the contents such as the sewage sludge dewatered cake. At the time of swinging in the opposite direction, the biting is naturally eliminated.

[0012]

As described above, according to the silo blade drive device of the present invention, a simple mechanism using a single drive cylinder without the need for a conventional large speed reducer or motor. Can be used to rotate the oscillating blade with a large torque, and it is difficult for the oscillating blade to bite, and even if biting occurs, it can be naturally resolved by oscillating in the opposite direction. There are advantages that can be done.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a plan view showing an embodiment of the present invention.

[Explanation of symbols]

1 silo, 2 bottom plate, 3 bearings, 4 blade spindles, 5
Swinging blades, 6 discharge holes, 7 large-diameter gears, 8 drive cylinders, 9 racks

Continuation of front page (56) References JP-A-54-107065 (JP, A) JP-A-62-122529 (JP, A) JP-A-2-265821 (JP, A) JP-A-60-6526 (JP) , A) Actually open sho 59-191141 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65G 65/30-65/48 B65D 88/68

Claims (2)

(57) [Claims] 1. The contents are uniformly distributed from the discharge hole of the bottom plate of the silo to the upper end of the blade main shaft having the bottom plate of the silo penetrated downward.
Attaching the swinging blades for cutting, and the blade spindle
A large-diameter gear is attached to the lower end of the silo, and a rack that meshes with the gear is reciprocated by a drive cylinder, so that the oscillating blade is oscillated within a certain angle range on the discharge hole . Blade drive unit. 2. The silo blade drive device according to claim 1, wherein the swing angle of the swing blade is 180 ° or more.