JPS59120213A - Traveling grit scraper - Google Patents

Abstract

PURPOSE:To efficiently perform the scraping-up work of precipitated sand, by a method wherein the height position of a bucket during horizontal movement in scraping is allowed to follow the positional variation of the surface layer of the precipitated sand in a sand precipitation basin and the tension force of the chain having the bucket attached thereto is kept constant. CONSTITUTION:A liftable frame 8 is lowered onto the surface layer of the precipitated sand in a sand precipitation basin 1 by a rising and falling drive apparatus 14, a winding cylinder drum 13, a sheave 12 and a wire rope 11 and a rising and falling cylinder 10 is fixed to the side wall by a clamp cylinder 9. Constant tension is imparted to a chain 7 equipped with a bucket 6 by a winding cylinder drum 16, a hydraulic motor 17, a tension chain wheel 14 and a wire rope 15. The chain 7 is driven to an A-direction by the operation of a scraping drive apparatus 18 and precipitated sand is scraped up by the bucket 6 to be taken out onto a conveyor 23 through a chute 22. By this constitution, the bucket 6 is allowed to follow the movement of the surface layer of the precipitated sand by the rising and falling cylinder 10 and the tension force of the chain 7 can be kept constant by the tension chain wheel 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand raking device for a sand settling pond in a sewage treatment plant, etc., and in particular, maintains a constant chain tension state through hydraulic control, even when the amount of sand piled up changes. The present invention relates to a sand raking device capable of raking and lifting sand in sequence from the upper surface of the sand, and also capable of lifting sand from a plurality of sand settling basins.

There are link belt type, traveling type, screw pump type, etc. as conventional sand-sloughing devices that have been put into practical use. In the link belt type, an underwater head chain wheel is installed near the bottom of the sand settling basin, an intermediate chain wheel is installed at an appropriate position above the pond, and an endless chain 7 with a bucket attached is wound between these chain wheels. The link belt type has a fixed device, so one unit can be installed per pond, and a large amount of sediment can flow into the settling basin due to heavy rain, etc. In such a case, the bucket for sand raking becomes buried in the settling sand, resulting in an overload condition, which causes the raking device to become inoperable.

In addition, in the traveling type, a traveling trolley is installed in the sand settling basin, and a traveling trolley is installed on the traveling trolley so that raking operation can be performed in multiple sand settling basins, and the packet electric heater can be moved up and down on this traveling trolley. This is a device that scrapes up sand by installing a Bakusoto elevator and moving it with a traveling trolley, but this traveling type uses a traversing trolley.

There is a drawback in that a conveyor is required to carry out the sand as the traveling cart moves.

The purpose of the present invention is to scrape sediment from the upper surface of the sediment and control hydraulic pressure according to the load during raking.
The lifting frame can be raised and lowered freely by the KJ, and the take-up IJ'J car on the girder can be moved to keep the chain tensioned so that the chain can be operated with a constant tension. The present invention provides a device capable of raking operation.

In the present invention, a chain wheel is placed on a girder that runs across multiple ponds, a chain wheel with a packet is hung thereon, and the part of the packet that scrapes up in direct contact with the submerged sand deposited in the pond can be raised and lowered, This applies pressure downward.

The present invention will be explained based on the drawings of one embodiment.

In Fig. 1, reference numeral 1 denotes a plurality of settling basins having desired lengths, depths, and widths, and rails 19 are laid at both ends of the sand basins, which form a front and rear pair orthogonal to the settling basin waterway. A zaddle 2o with wheels 21 installed is placed on it, and a girder 2 is placed on the zaddle 2o so as to straddle a sand settling basin. On the girder 2, an elevating frame 8 is placed at a position avoiding the elevating device that moves up and down, and the sand raked by the packets 6 attached to both ends of the girder 2 and the endless chino 7 can be turned over with a sheet 22. Similarly, the chain wheel 3 is placed at a location determined by the tension or the relationship with the position of the 11th wheel 4. Further, a casing 25 is provided on the chute 22 side, and a raking 1 drive device 18 for raking up sand by an endless chino 7 equipped with a packet 6 is disposed in the casing 25. An elevating chamber 8 is provided inside the settling basin. helmet,
The elevating frame 8 can be raised and lowered at the upper position of the settling basin (-
5 This elevating frame 8 rotatably supports the underwater chain wheel 5.
Guide rails 24 are arranged at both ends of the ice chain wheel 5, and between them, guide rails 24 are arranged at a position where the chain 6 with a packet 7 attached thereto for 1 degree of winding and handling on the ice chain wheel 5 can be moved horizontally. The elevating frame 8'2 includes elevating cylinders ~10 which are integrated with a clamp cylinder 9 for fixing the hydraulic cylinder jD to the settling tank 1Vc.
placed on both sides. Lifting and lowering of the lifting frame 8 is performed by a loading/unloading drive device 14, a winding drum 13, a sheave 12, a wire lobe 11, and hydraulic cylinders 9 and 1o. Noboru 11
Drive device 14, winding drum 13, sheave 12u';l'
, attach it to girder 2. The hoisting drum 13 and the sheave 12 are rotated by the lifting drive device 14, and the wire lobe 1
1, the winding drum 13 and sheave 12 are arranged so that the elevating frame 8 is vertically raised and lowered.

A chain wheel 7 equipped with a packet 6 is wound around the chain wheel 3, tension chain wheel 4, and underwater chain wheel 5. The tensioning chain wheel 4 is used to tension the chain 7 on which the packet 6 is attached as the elevating frame 8 moves, and the tensioning chain wheel 4 and the wire rope 1
5 is configured as a tensioning device consisting of a winding drum 16 and a hydraulic motor 17.

The hoist drum 16 and the hydraulic motor 17 are arranged in a position to move the tension chain wheel 4 horizontally, and the hydraulic motor 14 causes endless changes in the locus of the chain as the elevating frame moves up and down. 7 is synchronized so that it automatically tightens the slack.

Helmet 5. i<shoes)・The sand raked near the pond bottom by B is conveyed vertically in the direction of the arrow, via the chute 22 located at one end of the girder 2, and then transferred to the rail 19 provided below the chute 22. It is carried out to a conveyor 23 arranged in parallel.

The function of the present invention is that the lifting frame is normally raised above the water, submerged in water only when raking sediment, and the lifting frame is placed in the settling basin using a clamp cylinder at a position where it can be raked from the surface layer of the sediment. After fixing the sand, the accumulated sand is collected and raised, and then discharged to a conveyor near the pond.

The clamp cylinder is fixed to the inner wall of the sand settling basin structure, which is the lifting frame itself, and the lifting cylinder, which is rigidly connected to the clamp cylinder, allows the lifting frame to move up and down slightly and applies appropriate downward pressure. be. For large lifts, the entire lift frame is raised and lowered by the lift drive device, and for small lifts, the lift cylinder is used to raise and lower the entire lift frame.

Two movements are made with respect to the surface layer of the sediment: one is a large vertical movement of the position of the packet scraping the sediment, and the other is a small movement from each position.

From the above, the present invention has the following effects.・A sand raking section that can be raised and lowered is installed in the settling basin, and there are two levels of raising and lowering, large and small, so that the height position of the horizontal movement of the packet during raking automatically follows changes in the position of the sand surface layer. As a result, the support part of the packet avoids the sand film when raking, eliminating the need for manual sand removal, and the raking part retreats above the water except when the three-way continuous rotation is used, which can be used immediately when operation is desired. Therefore, these parts and parts are less likely to corrode and last longer, resulting in significant cost savings.

As for the upper and lower positions of the raking section, it is possible to quickly descend near the sediment surface layer at the start of operation, and it is possible to move up and down in small steps from that position, so raking can be done at the optimal position. It was also possible to prevent packets from escaping upward during raking.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal front view, and FIG. 2 is a longitudinal sectional view. 1: Sand basin, 2: Girder, 6: Chain wheel, 4: Tension chain wheel, 5
: Underwater chain wheel, 6: Packet, 7: Cheno, 8: Elevating frame, 9: Clamp cylinder, 10: Elevating cylinder, 11° elevating wire rope, 12: Sheave, 15: Winding drum, 14: Jj? Lower drive device], 15: Wire rope, 16: Winding drum, 17: Hydraulic motor, 18:
raking drive device, 19: rail, 20: saddle, 21: wheel, 2. ? : Chute, 23: Conveyor, 24 Nirail, 25: Casing agent Noriyuki Izunaka

Claims (1)

[Claims] Multiple chain wheels are installed on the girder that runs with a sand settling basin, and chain wheels are installed on the elevating frame that can raise and lower the part that scrapes up the sediment from the pond bottom, and chains with packets are endlessly wrapped around these chain wheels. In the sand scraper that transports sand from inside the pond to the outside of the pond, the clamp cylinder that fixes the lifting frame to the pond wall and the cylinder that can be raised and lowered from the fixed position are hydraulically controlled, and the endless chain moves. A traveling sand scraper characterized by having tension that changes the locus of movement in synchronization with the elevation and descent of an elevating frame.