JPS6313768Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is installed in a settling basin that settles and collects sand and solids contained in sewage, and removes the sediment accumulated in the sand pool at the bottom of the settling basin outside the basin. This invention relates to a bucket conveyor-type sand settling and scraping device for lifting.

This type of bucket conveyor-type sand raking device installed in a sand settling basin has V buckets attached to chain wheels attached to multiple shafts installed between opposing inner walls facing the sand pool at the bottom of the settling basin. A common method is to use an endless chain, and by passing a part of the chain outside the sand basin, the sand in the sand basin is successively scraped up using a V-bucket.

That is, in this device, the V-bucket passes through the sand pool at the bottom of the settling tank, scoops up the sand in the sand pool, and when the V-bucket is located outside the sand-settling tank, it is reversed and the sand in the V-bucket is scooped up. It is something that is emitted.

In the case of equipment with the above structure, there will be no problem if the chain runs endlessly 24/7, but it is uneconomical to drive the chain when there is no sand in the sand pool, so a certain amount of sand will settle. Stop running the chain until then.

However, if sedimentation increases rapidly while the chain is stopped, the load becomes too large to start the chain even if an attempt is made to drive it, and the chain may become buried during this period. Once a chain is buried, it not only takes a lot of time and effort to restore it and restart it, but it also loses its function as a settling basin during this time, which has a serious impact on sewage treatment.

In order to solve the above-mentioned problem, various devices have been proposed in the past in which the part of the chain located in the sand pool is moved upward while the chain drive is stopped, thereby preventing the occurrence of burying accidents. (For example, Special Publication No. 42-18543, Utility Model Publication No. 48-94627,
Actual Publication 1976-6996, Japanese Patent Publication 52-9976, Japanese Patent Publication 1977-55-
47108).

According to each of the above proposals, although it is possible to achieve the objective, they all have complex structures, are prone to failure, and have many parts, making them uneconomical, making them difficult to put into practical use. Nakatsuta.

Based on the above-mentioned points of view, this invention provides a bucket conveyor type sand raking device that is extremely simple and economical in structure, has no risk of failure, and is easy to maintain. A drive chain wheel on the drive shaft supported at a fixed position on the bottom of the sand settling basin, a tail chain wheel on the tail shaft supported at a fixed position near the bottom of the settling basin, and a tail chain wheel mounted swingably at a fixed position above the settling basin. a swing arm movably supported at its upper end using a tube member with a built-in repulsion mechanism as a guide, and supporting a head chain wheel at its lower end that can freely approach the bottom of the settling basin; and a hydraulic cylinder supported by a trunnion at a fixed position above the sand settling basin and having a rod tip connected to the intermediate part of the swing arm, and an endless chain with a bucket that extends between each of the chain wheels and a predetermined intermediate chain wheel. It is characterized by comprising the following.

Next, the apparatus of this invention will be explained by way of examples with reference to the drawings.

The drawing shows an embodiment of the invention in a partially schematic longitudinal sectional side view. As shown in the drawing, the sand settling basin 1 is formed under a concrete floor slab 2, and a sand basin 3 of a predetermined length and depth is provided at the bottom.

An opening 4 is provided in a portion of the floor slab 2 facing above one end portion 3A of the sand pool 3.

The opening 4 is covered by a frame 5, on which a drive shaft 6 and an intermediate shaft 7 are supported.

The drive shaft 6 is connected to a motor (both not shown) via a reduction gear, and a drive chain wheel 8 is fixed thereto.

On the other hand, a tail shaft 9 is installed across the left and right side walls of the other end 3B of the sand basin 3, and a tail chain wheel 10 is fixed to the tail shaft 9.

A hydraulic cylinder 12 is supported by a trunnion on a bearing 11 provided on the frame lower frame 5A, which is lower than the support position of the drive shaft 6. The tip of the rod 13 of the hydraulic cylinder 12 is connected to the middle of the swing arm 14 by a pin 15.

The swing arm 14 has a length such that its lower end can freely approach the bottom of the sand pool 3, and a head shaft 16 supported at the lower end.
A head chain wheel 17 is attached to the head chain wheel 17. The upper end of the swing arm 14 is connected to the frame lower frame 5
It is inserted into a tube member 18 that is swingably supported on A, and the upper end surface of the swing arm 14 is attached to a spring 19 that is attached to the tube member 18.
The swing arm 14 is always pressed downward by the spring 19.

An endless chain 23 is stretched between each of the chain wheels, an intermediate chain wheel 20 attached to an intermediate shaft 7 serving as a take-up shaft, and an intermediate chain wheel 22 attached to an intermediate shaft 21 installed in the settling basin 1.

The endless chain 23 is assumed to run in the direction of arrow a, and a large number of V-shaped buckets 24 are attached to it.

In the device constructed as described above, when the hydraulic cylinder 12 is actuated to project the rod 13, the swing arm 14 descends using the pipe member 18 as a guide, so that the head chain wheel 17 moves into the sand pool 3. Approach the bottom of end 3A.

In this state, the part of the endless chain 23 between the tail chain wheel 10 and the head chain wheel 17 is almost parallel to the bottom of the sand pool 3, and as the endless chain 23 runs, the bucket 24 successively scrapes off the sediment in the sand pool 3. , discharged outside the settling basin.

Next, while sand settling and raking is suspended, the hydraulic cylinder 12 is operated to retract the rod 13.

This allows the swing arm 14 to move to the tube member 18.
Move upwards inside the head chain wheel 17.
As it rises, the part of the endless chain 23 between the tail chain wheel 10 and the head chain wheel 17 tilts, and most of it comes out above the sand pool 3, so even if it is stopped, it will not get stuck in the sand and become stuck. do not have.

The swing arm 14 also has a spring 19.
Since the movement is restricted by the pipe member 18 in which the hydraulic cylinder 12 is installed, it can be smoothly moved up and down by the operation of the hydraulic cylinder 12. Note that a hydraulic cylinder may be installed in the pipe member 18 instead of the spring 19.

As is clear from the above explanation, the device of this invention can very easily escape most of the part of the endless chain facing the sand pool out of the sand pool by only driving the hydraulic cylinder. It is possible to reliably prevent the endless chain from being buried in the sand pool, and the tension of the endless chain is always kept constant, so there is no need for take-up for slack adjustment, and the main part of the endless chain lifting device is located on the floor slab. In addition to being easy to maintain and manage, it also uses a small number of parts and can be obtained at a low price, resulting in many excellent industrial effects.

[Brief explanation of drawings]

FIG. 1 is a partially schematic longitudinal sectional side view showing an embodiment of the device of this invention, and FIG. 2 is a view taken along the line A--A in FIG. 1. In the drawing, 1...Sand basin, 2...Slab, 3
... Sand pool, 4 ... Opening, 5 ... Frame, 6 ... Drive shaft, 7 ... Intermediate shaft, 8 ... Drive chain wheel, 9 ... Tail shaft, 10 ... Tail chain wheel, 11 ... Bearing, 12...hydraulic cylinder,
13...rod, 14...swing arm, 15
... Pin, 16 ... Head shaft, 17 ... Head chain wheel, 18 ... Pipe member, 19 ... Spring, 20, 22 ... Intermediate chain wheel,
21... Intermediate shaft, 23... Endless chain, 24...
...bucket.

Claims (1)

[Scope of utility model registration request] a drive chain wheel on a drive shaft supported at a fixed position above the settling basin; a tail chain wheel on a tail shaft supported at a fixed position near the bottom of the settling basin;
The upper end is movably supported using a tube member with a built-in elastic mechanism that is swingably installed at a fixed position above the settling basin as a guide, and the head chain wheel that can freely approach the bottom of the settling basin is supported at the lower end. a swing arm that is lower than the drive shaft support position, and
A hydraulic cylinder supported by a trunnion at a fixed position above the settling basin and having a rod tip connected to the intermediate part of the swing arm, and an endless chain with a bucket that is stretched between each of the chain wheels and a predetermined intermediate chain wheel. A bucket conveyor type sand raking device.