JPH0322339Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a rake that uses a rake to rake up debris that has flowed into waterways installed in intake channels of pumping stations, power plants, etc., or settling basins in sewage treatment plants. Used to remove water from water.

The debris flowing into the waterway lands on the front of the bar screen and is scooped up by a rake-equipped bucket that is driven by an endless link chain.

Prior Art In a rake-raising type automatic dust remover installed in waterways, etc., the rake descends from the back of the bar screen installed in the waterway, and at the bottom of the waterway, the rake is rotated by the lower sprocket to remove dust from the front of the bar screen. Since the rake is scooped up from below, the area between the lower end of the bar screen and the bottom of the waterway is open for the rake to pass through, and no bar screen is provided in that area. Therefore, conventionally, as shown in Japanese Utility Model Publication No. 50-38995, an auxiliary screen is provided in front of the lower end of the main bar screen to prevent dust from flowing in through the open portion.

Problem to be Solved by the Invention However, even if such an auxiliary screen is provided, the space between the main and auxiliary screens that allows the rake to pass through will be an opening, and dust will flow into the opening beyond the auxiliary screen. It is unavoidable to do so. In addition, the lower end of the main bar screen is installed as close as possible to the underwater shaft, but a slight gap is required to avoid collision with rotating objects, and through this gap dirt can pass downstream.
Also, there was a risk that foreign matter might get caught in the gap.

Purpose of the invention The present invention solves these conventional problems.The first purpose is to completely prevent the passage of dust and foreign objects from the gap between the underwater shaft and the tip of the rake. Another object of the present invention is to provide a lower screen device for an automatic dust remover that has a simple structure, is free from failure, and can be implemented at low cost.

Means for Solving the Problems In order to achieve the above object, the lower screen device of the automatic dust remover according to the present invention has a rake that scrapes up the dust that has landed on the front side of the main bar screen provided in the waterway. A dust remover is provided between two left and right endless link chains stretched between the upper and lower sprockets, and the endless link chain is forward-driven by a driving sprocket above the water surface. A disc screen is installed in accordance with the thickness and pitch of the screen and in close proximity to the lower end of the main bar screen, and the rake rotates around the underwater axis while the rake toe is in occlusal and sliding contact with the disc screen. It is constructed as a moving structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the invention are illustrated in the accompanying drawings. FIG. 1 shows the underwater lower part of an endless link chain type automatic dust removal device with a rake in which the present invention is implemented. In the figure, reference numeral 1 denotes a main bar screen installed in a waterway, and a bucket 2 with a rake, which will be described later, scoops up garbage that drifts on the front surface of the main bar screen and carries it to the upper part of the water. The two left and right endless link chains 3 are drive sprockets above the water surface (not shown)
and the lower sprocket 4 at the bottom of the water, and is driven to be forwarded by the upper driving sprocket. A plurality of bucket carts 2 with rakes are attached to the endless link chain 3 at predetermined intervals such that one bucket cart always stays at the bottom, and each bucket cart is provided with a rake 2a. rake 2
The tip of the rake a is constructed so that it engages with the main bar screen 1, and when dirt is scraped off with the tip of the rake, it is immediately dropped into the bucket 2.

Although this embodiment shows a bucket cart with a rake, it is also possible to use only a rake. The lower sprocket 4 is attached to both left and right ends of an underwater shaft 5 made of a hollow tube shaft, and is fixed so that it can be removed when necessary. The disc screen 6 is mounted around the underwater shaft 5. This circular plate screen 6 is made up of a large number of circular plates 6a arranged at predetermined intervals, and is formed to match the plate thickness and pitch of the main bar screen 1, with a gap between each bar lower end 1a of the main bar screen 1. Make it close to zero.

Further, in this disc screen 6, each annular plate 6a is removably attached with a spacer 6b using a pipe and a binding bolt 6c.

Function: Flowing water flows in the direction of arrow A in the water channel, and the dust in the flowing water is washed onto the front surface of the main bar screen 1. When the endless link chain 3 is fed by rotation of the upper sprocket by the drive of a motor (not shown),
Each bucket 2 descends one after another at the rear of the bar screen 1 as indicated by the arrow RO in Fig. 1, and when it reaches the lower sprocket 4, it turns around and heads upward.
At this time, the rake 2a of each bucket 2 moves in reverse with its toe biting into the disc screen 6, so the rake 2a scrapes off the dirt around the underwater shaft 5, and guides it into the bucket 2, so it moves backward. It completely prevents dust from passing through or getting caught.

The bucket 2 that has gone around the disc screen 6 rises in an upward position in front of the main bar screen 1, so the rake 2a scrapes up the debris that has landed on the main bar screen 1 and carries it to the upper part of the water.

Effects of the invention As mentioned above, in this invention, a disc screen is provided around the underwater axis of the lower sprocket in accordance with the plate thickness and pitch of the main bar screen. By reversing the movement around the axis, it is possible to completely prevent debris from passing backwards through the gap created between the lower end of the bar screen and the underwater axis as in the conventional case, and since there is no gap, it also prevents foreign objects from getting caught. It can be prevented, has a simple structure, is practical, and can be implemented at low cost.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of the underwater lower part of a dust remover showing an embodiment of the present invention, and FIG. 2 is a partial front view around the underwater axis. 1...Main bar screen, 2...Bucket, 2
a...Rake, 3...Chain, 4...Lower sprocket, 5...Underwater shaft, 6...Disc screen.

Claims (1)

[Scope of utility model registration request] A rake that scrapes up debris that has washed up on the front surface of the main bar screen installed in the waterway is installed between two endless link chains on the left and right that are stretched between the upper and lower sprockets, and this endless link chain is used to drive the upper part of the water surface. In a dust remover that is driven by a sprocket, a disc screen is arranged around the submersible axis of the lower sprocket in accordance with the plate thickness and pitch of the main bar screen, and in close proximity to the lower end of the main bar screen. A lower screen device for an automatic dust remover, characterized in that the rake moves in reverse around an underwater axis while attaching the rake tip to the disk screen in an interlocking and sliding manner.