JPS6223602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endless chain type sand scraper for removing sediment from a settling basin of a sewage treatment facility, and particularly to a mechanism for swinging a submersible sprocket wheel.

Conventional sand scrapers have one pair of links on the upstream side near the bottom of the sand basin, and one pair on the downstream side.
The link has a substantially square shape, and a shaft is inserted into the center of the link and fixed, and the shaft is supported by a shaft system on the wall of the settling basin.

A sprocket wheel is pivotally supported at the lower end of the upstream link and the downstream link located below the wall support point, and a pin hole is provided at the upper end of the link. The head link and tail link are connected by a beam through this pin hole, and when the head link is swung via a wire rope that goes up and down, the tail link also swivels at the same time.

If the spacing between the sprocket wheels around which the endless chain is wound changes due to rocking, the endless chain may sag and separate from the sprocket wheel, or the endless chain may become abnormally bent, making normal operation impossible. It disappears. Therefore, an endless chain equipped with a bucket is wound between the sprocket wheels.
In the conventional endless chain type sand scraper, which scrapes and lifts the sediment accumulated on the bottom of the sand settling basin by rotating this chain, an underwater snap shaft is installed on the beam connecting the head link and the tail link. The underwater snap shaft was made to move simultaneously with the swinging of the head link, and a device was installed on the beam to tension the sag of the chain. The span of the beam is usually about 20 m, and a tensioning device of about 300 kg is placed near the center of the beam, so a bending moment due to the live load and its own weight acts on the beam, and a tensile force is applied due to the swinging of the link, making it extremely large. However, the disadvantage was that the beam was unstable due to deflection and vibration due to the applied load.

The present invention has been made in order to eliminate the drawbacks of the prior art, and it is an object of the present invention to provide a sand-settling scraper in which a device for tensioning the endless chain in synchronization with the swinging of the link is provided on the wall of the sand-settling basin. purpose.

In the present invention, the span of the beam that connects the head link and the tail link is halved compared to the conventional one, the beams are connected by a coupler, each of them is pin-jointed, and the shaft is fitted into the coupler to form an underwater snap bearing. A sprocket wheel is attached, a guide rail is fixed to the sand settling basin wall, and the submersible snap bearing moves on the guide rail in synchronization with the swinging of the head link.

Next, embodiments of the present invention will be described based on the drawings.

A main body casing 18 is provided above the sand settling basin 1, and a driving sprocket wheel 19 and a guide sprocket wheel 20 are provided at appropriate positions. These sprocket wheels 19, 20, the tensioning sprocket wheel 15, and the head sprocket wheel 5 and the tail sprocket wheel 5' provided near the lower end of the head link 3 and the tail link 3'.
An endless chain 22 equipped with a bucket 21 is wound around it.

Bearings 2 are attached to both walls of a sand settling basin 1, and a shaft 4 having links 3 fitted to both ends is rotatably supported by the bearings 2. Head sprocket wheel 5 and tail link 3' provided near the lower end of head link 3
A tail sprocket wheel 5' provided near the lower end of the shaft is rotatably fitted onto the shafts 6 and 6', respectively.

The hoisting device 7 is connected to the head link 3 via a wire 8. The head link 3 and the tail link 3' are connected by a beam 10 via a pin 9, and are connected by a coupler 11 in the middle of the beam 10, and both ends are connected by a pin 1.
Join with 2. A shaft 13 is fitted into this coupler 11, and an underwater snap bearing 14 and a sprocket wheel 15 are attached to the shaft 13. Guide rail 1
6 is fixed to the sand settling basin wall 17.

Next, the operation of the above configuration will be explained. As the hoisting device 7 rotates forward and backward, the lower end of the link 3 moves up and down between I and I. When the lower end of the link rises from to I, the endless chain sag by a length corresponding to the distance traveled from to I. To absorb this sag, the underwater snap bearing 14 moves on the guide rail 16, The tensioning sprocket wheel 15, which is fitted on the same shaft 13 as the snap bearing 14, moves toward the tensioning side from the A position to the B position. Also, when the hoisting device 7 is rewound and the lower end of the link 3 is lowered from I, the underwater snap bearing 14 is moved to the guide rail 1.
6 and thus the sprocket wheel 15
moves from position B to position A on the hanging side.

According to this embodiment, the following effects are achieved.

The span of the beam that connects the head link and tail link is divided into two parts, the middle of the beam is connected with a coupler and pin jointed, and a guide rail with a tension device fixed to the wall that operates in synchronization with the swing of the beam. Since the beam is installed through the bridge, no live load is applied to the beam, and only the bending moment due to its own weight and the tensile force due to link swing are applied, so the beam is stable without deflection or vibration, and the beam itself can be made smaller and lighter, making it cheaper. becomes.

[Brief explanation of the drawing]

Figure 1 is a longitudinal front view, Figure 2 is a diagram of the relationship between the link and the wall, and Figure 3 is a diagram of the relationship between the wall and tension. 3...Arm, 10...Beam, 14...Underwater snap bearing, 16...Guide rail.

Claims (1)

[Claims] 1. Sprocket wheels are installed near the bottom of the settling basin and on the top of the basin, and an endless chain with a bucket attached to these sprocket wheels is rotatably suspended. To connect the head link and tail link of the beam, connect the beam, coupler, and other beam, pin each joint, insert the shaft into this coupler, install the underwater snap bearing and sprocket wheel, and set the guide rail in the sand. A sand raking machine fixed to a pond wall, characterized in that a submersible snap bearing moves on a guide rail in synchronization with the swinging of a head link.