JPS591685Y2 - Sand raking machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sediment scraping machine that prevents siltation in a sand settling pond. The purpose is to reliably and smoothly perform frying with a simple structure.

Conventionally, the packet conveyor frame placed along the bottom of the settling basin has two frames arranged parallel to each other on both sides of the bottom of the basin, which are connected to each other to form a single body, and this frame is equipped with sprocket wheels at the front and rear ends. It is common to use a sand raking machine in which an endless packet conveyor is stretched between this wheel and a wheel on oil.

However, this structure requires two frames and a link that swingably supports each frame in a hanging manner, making the structure complex, and has the disadvantage that the amount of debris that gets entangled with each frame and link is also large.

The present invention has been developed in view of this, and will be described below based on the illustrated embodiments.

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 in this settling basin 1, a large number of buckets (B) are attached to an endless chain at a required pitch, and a bucket chain 2 for lifting the settled sand is stretched.

As detailed in Fig. 1, this bucket chain 2 has a single packet conveyor frame 3 of a predetermined length arranged along the center of the bottom of the settling basin underwater and in the longitudinal direction of the settling basin. Brackets 3e and 3e are provided on both ends so as to protrude from each other so as to face each other, and submersible sprocket wheels 5a and 5b are rotatably provided on the brackets 3e via support shafts 3a and 3b, respectively.

The sprocket wheels 5a, 5a and 5b, 5b are opposed to each other.

Guide shafts 4a and 4b are provided above the water, and each guide shaft is provided with a guide sprocket wheel 6a and 6b, respectively, as well as a take-up shaft 7a and a drive shaft 8a.
A take-up sprocket wheel 7.8 and a drive sprocket wheel 7.8 are provided on each axis, and two bucket chains 2 are parallel to each other between the wheels 5a, 5b, 6b, 6a, and 7.8. mesh and tighten.

Furthermore, one or more chain guides 3C are vertically installed between the sprocket wheels 5a and 5b at both ends of the single 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 connected to the sprocket wheels 5 between the Cheno guides 3c and 3c and 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.
When the packet conveyor frame 3 is in the sand raking position, that is, along the pond bottom, the links 9 and 10 are pivoted at an angle θ from the vertical position as shown in FIG. It is supported in a receded and inclined position.

Further, the overall length of the front link 9 and the rear link 10 may be the same, but the front link 9 is shortened so that the front part of the frame 3 can be lifted more than the rear part, and the length of the rear link 10 is made longer. It is also possible to make them different in terms of strength.

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 conveyor 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 sand settling basin and accumulates on the bottom of the basin above a certain level, the drive device M is driven, and a single conveyor is thereby driven through the drive sprocket wheel 8. A bucket chain 2 suspended between the front and rear ends of the frame and the sprocket wheels above the oil is driven, and the sediment is scraped up by each packet B, and discharged into the oil well by the discharge machine 11, which is composed of a chute, a conveyor, etc. be done.

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 at a position retracted 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.

Even if the sand is scraped up, the conveyor frame will not move backward until the sand reaches a set load, that is, the forward force F of the conveyor frame.

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

If part or all of this packet conveyor is buried in earth and sand, an excessive load greater than F 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.

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 Cheno guide and is positioned above the sand settling, the overload is released and the sand raking is carried out 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 It is something to tighten.

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.

Therefore, according to the present invention, there is only one conveyor frame on which the packet conveyor is stretched and arranged along Ikezo Nakao.
The links are tilted and supported at a preset angle to apply a constant forward force to the conveyor frame, i.e., a force in the opposite direction to the reaction force generated by raking. Because the conveyor frame does not retreat until the set amount of sediment and raking reaches the set amount, raking can be performed reliably.Also, when the packet conveyor is connected or due to a temporary increase in inflowing sediment, burying or raking load exceeds the normal value. Even if the conveyor frame becomes larger, the conveyor frame will naturally rise due to the increased reaction force applied to the packet conveyor, and the load applied to the packet conveyor will always be adjusted to the normal value. Therefore, there is no need for a member to connect the two frames, and there are advantages such as less damage to the water flow, less adhesion of dirt in the water, and a simple structure that makes it cheaper.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view, and FIG. 2 is a side view of the same. 1...Sand basin, 2...Bucket chain, 3a, 3b...Support shaft, 3C...
...Chain guide, 3e...Bracket, 4a
, 4b...Guide shaft, 5a, 5b...
・・Underwater sprocket wheel, 6a, 6b・・・・
・Guide sprocket wheel, 7... Sprocket wheel for take-up, 7a... Take-up shaft, 8... Drive sprocket wheel,
8a... Drive shaft, 9... Front link, 1
0... Back link, 9 a, 10 a...
...Shaft, 11...Ejector, 12...Guide, B...Packet, M...Driving device.

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 the sand-slitter scraper, in which the packet conveyor frame is supported by links at the front and rear so that it can swing freely in the backward direction of the conveyor frame, the conveyor frame is aligned along the center of the longitudinal direction of the pond bottom. A sand raking machine that has brackets protruding from both front and rear ends of this single conveyor frame to support submersible sprocket wheels on both sides.