JPS591684Y2 - Silt prevention type sand scraper - Google Patents

Description

[Detailed description of the invention] The present invention relates to a siltation prevention type sand raking machine in a sand settling pond.
Even if the intended amount of sediment is small and the amount of raking by each packet is small, or even if a large amount of sediment temporarily flows in during rain, the raking machine will not be able to handle excessive sand even if the packets become buried. The purpose is to ensure that the sand is raked up smoothly without any load being applied.

Conventional sand raking is equipped with sprocket wheels at the front and rear ends of a packet conveyor frame placed along the bottom of the sand settling basin, and an endless packet conveyor is stretched between these wheels and the wheels above the oil. At the machine, the packet conveyor frame is supported by a hanging wheel with links to prevent the packets from being buried and to smoothly lift up the sediment even when there is a strong influx of earth and sand temporarily such as during rain. However, when a load is applied to the packet conveyor, this link is made to swing, causing the conveyor frame to move upward while moving backward.

Therefore, in this method, when an overload is applied to the packet conveyor, the packet conveyor frame can swing in the backward direction to escape the overload, but the amount of sediment scraped by each packet is small, and the load is not too large. If a load is applied to the conveyor frame and the link swings, there is a drawback that it becomes impossible to lift up the sediment with the packets.

For this reason, in the above-mentioned type of sand settling and scraping machine, it has been a problem how to set the load for the conveyor frame to retreat.

In this invention, the conveyor frame maintains the normal position without retreating when the load of sand raking by each packet is less than the set raking amount, and when overload occurs, the conveyor frame swings backward. In this way, smooth raking can be performed even when the amount of sand raking is small, or even when the packet conveyor is buried.

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 dark groove, etc., and a bucket chain 2 for sand removal consisting of a large number of buckets (B) attached to an endless chain at a required pitch is stretched in this settling basin 1.

As detailed in Fig. 1, this bucket chain 2 is constructed by disposing a packet conveyor frame 3 of a required length along the bottom of the settling basin and in the longitudinal direction of the settling basin, and supporting the conveyor frame at both its front and rear ends. Underwater sprocket wheels 5a and 5b are rotatably provided via shafts 3a and 3b, respectively, and guide shafts 4a and 4b are provided above the water, and each guide shaft has a guide sprocket wheel 6, respectively.
In addition to providing a take-up shaft 7a and a drive shaft 8a, each shaft is provided with a take-up sprocket wheel 7.8 and a drive sprocket wheel 7.8, respectively. 5 b, 6 b, 6 a
, 7.8, the above-mentioned hacket chain 2 is meshed and stretched.

Further, one or more chain guides 3C are vertically installed between the sprocket wheels 5a and 5b at both ends of the packet conveyor frame 3, and the roller portion of the bucket chain 2 is supported by the chain guides 3C.

This cheno guide 3C is provided at the lower end of the bracket 3d protruding from the packet conveyor frame, and is located between the cheno guides 3c and 3c and between the sprocket wheels 5 at both ends.
The distance between a or 5b and the adjacent chaino guide 3C is determined so that the amount of hanging of the bucket chain 2 due to its own weight, etc., is within an allowable range even when the frame is lifted or raised.

Therefore, if the frame length is large, the number of cheno guides will also be large.

Further, the lower ends of the front link 9 and the rear link 10 are pivotally connected to the front and rear parts of the packet conveyor frame 3, respectively, and the upper ends of the links 9 and 10 are connected to shafts 9 provided in the sand settling basin.
a, 10a, and when the packet conveyor frame 3 is in the sand scraping position, that is, along the pond bottom, the links 9, 10 are pivoted at an angle θ from the vertical position as shown in FIG. Support in a receded and inclined position.

The overall lengths of the front link 9 and the rear link 10 may be the same, but the lengths are set such that the link 9 is short so that the front part of the frame 3 can be lifted more than the rear part, and the length is set so that the rear link 10 is long. It is also possible to make them different.

The drive shaft 8a is equipped with a drive device M, which drives the drive sprocket wheel 8 at a required speed, drives the bucket chain conveyor, and scrapes up the sand. It is also possible to make it adjustable.

Below between the drive sprocket wheel and the take-up sprocket wheel, there is a carry-out machine 11 for discharging the sand scraped up by each packet by the drive of a packet conveyor by tilting the packets, and for discharging it to the sand oil well. establish.

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

A guide 12 is provided in a substantially horizontal direction above the guide sprocket wheel 6a provided on the first guide shaft 4a, and a take-up shaft 7a that slides on this guide 12 is provided.
A take-up sprocket wheel 7 is provided on this take-up shaft, and the shaft 7a is connected to a take-up screw rod 7b.
The wheel 7 is slid to prevent the bucket chain from sagging, thereby keeping the tension of the chain substantially constant during normal operation.

In the above-mentioned sand settling and scraping machine, when sediment, etc. flows into the settling basin and accumulates on the bottom of the basin above a certain value, the driving device M is driven, and the bucket chain 2 is thereby driven via the driving sprocket wheel 8. The sand is scraped up by each bucket (B) and discharged into the oil well by a discharger (comprised of a chute, a conveyor, etc.) 11.

Note that the packet conveyor may be constantly driven regardless of the amount of sediment.

As the packet conveyor is driven, a reaction force acts on the packet conveyor frame, but during normal sediment and raking, the frame stops at the normal position or a position close to the normal position as shown by the solid line in Figure 1. Only the conveyor is driven to lift up the sediment.

In this case, the links 9 and 10 are supported in contact with the stopper S at a position retreated by an angle θ from the vertical position, but a force F is acting on the conveyor frame to advance the links to the vertical position.

The forward force F of this conveyor frame is the conveyor frame 3
If the weight of the links 9 and 10 is W, and the angle θ formed by the links 9 and 10 when they are supported by the stopper S is expressed by the following equation.

F = W

This resultant force T' acts as a resistance force during sand raking, and acts as a force that causes the conveyor frame to retreat.

When the relationship between this resultant force T' and the forward force F of the conveyor frame is expressed by the following equation, that is, when F≧T', the conveyor frame will not move as shown in the solid line in Fig. It is held in the normal position shown.

Therefore, sand raking is performed normally without the conveyor frame retreating until the raking amount reaches the set load.

If the amount of sediment flowing into the settling basin increases due to rain, etc., part or all of the packet conveyor, which is stopped or in operation, may be buried by the sediment.

If part or all of this packet conveyor is buried in earth and sand, an excessive load will be applied to the driven packet conveyor.

The normal driving force is set to be larger than the driving force during normal operation, so even if a part of the packet conveyor is buried, the packet conveyor will not stop, but the load will be higher than normal. When applied to the packet conveyor, the reaction force applied to the conveyor frame also increases accordingly.

Due to this increase in reaction force, the conveyor frame 3, which has been stopped at the normal position, moves backward in the direction of the reaction force.

That is, when F<T', the conveyor frame moves backward.

This is because the conveyor frame is supported by two front and rear links whose upper end is pivoted to the fixed side of the pond, so the conveyor frame moves backward as shown by the chain line in Figure 1 and is lifted upward. Then, the packet conveyor is raised together with the conveyor frame by the chain guide and is positioned above the sediment, the overload is released and the sand is scraped up with normal torque.

Then, the forward force F of the conveyor frame gradually increases according to the raking.
The conveyor frame gradually descends as the relationship between the raking resistance force T' changes and the conveyor frame gradually descends.In this way, even with an increase in inflowing sediment, sand can be raked up smoothly with a normal load. It is something to be done.

In the above embodiment, the frame 3 is raised naturally by the reaction force of the packet conveyor and remains at the bottom of the pond during standby, that is, when the packet conveyor is stopped. You can also have them wait.

According to the present invention, the packet conveyor is stretched and the links are tilted to support the conveyor frame placed along the bottom of the pond at a preset angle. Since a constant forward force, that is, a force in the opposite direction to the reaction force generated by raking, is always applied to the conveyor frame, the conveyor frame does not retreat until the amount of sediment raking by the packets reaches the set amount, so raking is not possible. This can be done reliably, and even if the burying or raking load exceeds the normal value when the packet conveyor is connected or due to a temporary increase in inflowing sediment, the conveyor frame will naturally rise due to the increased reaction force applied to the packet conveyor, and the packet conveyor will The advantage is that the load applied to the sand can be adjusted to a normal value at all times, allowing for smooth sand raking.

[Brief explanation of drawings]

Figure 1 is a longitudinal front view, Figure 2 is a side view, Figures 3 and 4.
The figure is an explanatory diagram.

Claims (1)

[Scope of utility model registration request] A packet conveyor is suspended so as to be freely drivable so as to scrape up sand in a settling basin, and the support shafts of submersible sprocket wheels on the upstream and downstream sides of the bottom of the settling basin, which engage the chains of this packet conveyor, are placed in the basin bottom. In a sand scraper equipped with a packet conveyor frame, the packet conveyor frame is supported swingably in the backward direction of the conveyor frame by links tilted backward at a certain angle at the front and rear of the frame. At the same time, in order to prevent the packet conveyor from floating due to the reaction force applied to the packet conveyor during normal raking operation, and when a reaction force greater than that during normal operation is applied to the packet conveyor, the conveyor frame swings upward while retreating due to the reaction force. This is a sand raking machine in which the support angle of the conveyor frame is determined by the links.