JPS5931287Y2 - Sand raking machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sand scraping machine, and its purpose is to prevent the scraping machine from being buried even if a large amount of earth and sand temporarily flows in during rain, etc. Moreover, even when there is a large amount of settled sand, it can be smoothly raked up.

Conventional sand settling and scraping machines generally have a packet conveyor installed along the bottom of the basin so that the sediment at the bottom of the basin is scraped up by the drive of the packet conveyor.

However, with this method, a large amount of earth and sand may temporarily flow in due to rainfall, or the packet conveyor may be buried by a large amount of earth and sand that flowed in when the packet conveyor is stopped, and the packet conveyor may become inoperable.

To prevent this, a mechanism has been proposed in which the entire packet conveyor inside the settling basin is lifted up and put on standby when not in use.
The disadvantage is that the device becomes large and the equipment cost is high.

The present invention was developed in view of this.

The present invention will be described below based on embodiments shown in the drawings.

In the figure, 1 is a street gutter installed at a sewage treatment plant, etc.
This is a settling basin into which rainwater, etc. is introduced through a culvert, etc., and a packet conveyor 2 for sand scraping, which is made up of an endless check 7C and a large number of buckets (B) attached at required pitches, is stretched in this settling basin 1.

As shown in detail in FIG. 1, this packet conveyor 2 is installed in the sand settling basin, with support shafts 3 located at the front and rear of the settling basin and also in the water.
a, 3b are provided, and guide shafts 4a, 4 are provided above the water.
b, 4 Ct 4 d and conveyor lifting shaft 5,
A drive shaft 6 is provided, and a sprocket wheel 8a, 8b, 8C28d, 8e is provided on each shaft.

8r, 8gt8h are provided respectively, and the check 7C of the packet conveyor 2 is meshed with each wheel and stretched, and the drive shaft 6 is equipped with a drive device (not shown) to drive the packet conveyor at a required speed. This is for raking up sediment.

This drive speed can also be made variable so that the raking capacity can be adjusted.

Below between the drive shaft 6 and the guide shaft 4d, there is provided a carry-out machine 7 for discharging the sand scraped up by each packet from the packets and out of the sand settling basin by driving a packet conveyor.

At this time, if necessary, a packet cleaning nozzle may be provided.

Further, a sprocket wheel 8e for raising and lowering the packet conveyor is disposed between the sprocket wheels 8cF8f provided on the guide shafts 4b, t, 4c, respectively, and a lifting device 9 is provided at one end or both ends of the shaft 5 of the wheel 8e, and this raising and lowering A sprocket wheel 8e supported by a shaft 5 is raised or lowered by a device 9, thereby raising or lowering the oil inflow side of the packet conveyor.

Although an electric cylinder is used as the elevating device 9 in the illustrated embodiment, it is also possible to use a hydraulic cylinder or other device.

Furthermore, the support shaft 3a of the sprocket wheel 8a, which is disposed underwater in the sand settling basin and on the inflow side of the basin, is positioned in front of the sprocket wheel 8f of the packet conveyor when the sprocket wheel 8e is raised by the lifting device. A tension higher than that during normal operation is generated, and it is made to be able to swing freely so as to rise with this tension.

As shown in the figure, the support shaft 3a of the sprocket wheel 8a may be pivoted to the tip of a lever 11 that is swingably supported by a support shaft 10, but the lever 11 is omitted and the drive direction of the packet conveyor is A guide 12 may be provided in a rising direction that matches the above, and the support shaft 3a may be supported by this guide 12 so as to be able to move up and down.

In either case, the sprocket wheel 8a is kept at a predetermined position on the pond bottom by its own weight during normal sand removal.

The device shown in Fig. 5 is a slack detection device that uses a spring to force the shaft 5 of the sprocket wheel 8e for lifting and lowering the four packet conveyors upward to activate the limit switch when the chain tension becomes small. .

When raking up sediment, the electric cylinder lowers the sprocket wheel 8e from the rising standby position, but when sand is accumulated on the bottom of the pond, the chain becomes slack.

This is detected by the detection device shown in FIG. 5, the roll is stopped, and the sand is scraped up by driving the packet conveyor.

As the raking progresses, the packet conveyor is further rolled up and loaded when the slack is removed.

The soil that has accumulated in this way is scraped up little by little from above.

According to the present invention, the packet conveyor on the oil inflow side is raised and lowered by raising and lowering a sprocket wheel that meshes with the packet conveyor, and the packet conveyor is driven separately to scrape the sediment regardless of the amount of sediment. There are advantages in that unloading can be performed reliably, the packet conveyor can be prevented from being buried by inflowing earth and sand, and the device can operate simply and reliably.

The same effect can be obtained even if the sprocket wheel 8e is moved in the horizontal direction or in the downward direction instead of in the upward direction.

[Brief explanation of the drawing]

Fig. 1 is a front view schematically showing the sand scraping machine of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan view of the sprocket wheel for lifting and lowering the packet conveyor, and Fig. 4 is a diagram of the swing type support shaft. FIG. 5, which is a diagram of a different embodiment, is an explanatory diagram of a slack detection device for a packet conveyor. 1...Sand basin, 2...Packet conveyor, 3at3b...Support shaft, 4a to 4d...
... Guide shaft, 5 ... Conveyor lifting shaft, 6.
... Drive shaft, 7 ... Unloading machine, 8a to 8h
... Sprocket wheel, 9 ... Lifting device, 10 ... Support shaft, 11 ... Rubber 12 ... Guide, C ... ... Cheno, B
······packet.

Claims (1)

[Scope of utility model registration request] The packet conveyor is placed along the bottom of the pond so as to lift up the sediment in the settling basin, and the conveyor is suspended so that the placing part can move freely.
A wheel support shaft on the oil inflow side at the bottom of the settling basin that engages this packet conveyor is installed from a predetermined position near the bottom of the basin so that it can be raised and lowered automatically when a resistance exceeding a set value is applied to the packet conveyor. At the same time, the weight of the wheel supported by this wheel support shaft is determined so that it is at a predetermined position on the bottom of the pond when there is normal scraping resistance. A sand-settling and scraping machine in which at least one of the wheels is movably provided independently of the drive of a checker 7, and the packet conveyor is raised and lowered by the movement of this guide sprocket wheel.