JPH0487604A - Linear motor drive type sludge scraper - Google Patents

Abstract

PURPOSE:To remarkably reduce the sliding parts in water, to prolong the service life and to improve the reliability of the scraper by providing a scraper to a sludge scraping truck traveled along the bottom of a basin by a linear motor and vertically moving the truck in the traveling direction of the truck. CONSTITUTION:A sludge scraping truck 3 is driven by a linear motor 7 and freely reciprocated on the bottom of a basin 1. A scraper 4 for scraping sludge toward a sludge pit 2 is furnished to the truck 3 and made vertically movable in the traveling direction of the truck 3. Consequently, the sliding parts in water are remarkably reduced, the service life is prolonged, and the reliability of the scraper is improved.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention scrapes the active sediment in a sand settling pond to a sludge removal position on the pond bottom using a sludge scraping cart that reciprocates along the pond bottom by a linear motor drive. This invention relates to a sludge scraping machine that is constructed as follows.

[Conventional technology]

In the sand pond of the sewage treatment plant, the sludge that has settled on the bottom of the pond is
There are bucket and chain types in which an endless chain is drivable and stretched between the pond bottom and the ground, and this chain is equipped with a large number of packets, or a type in which the pond bottom is shaped like a hopper and a screw conveyor is attached to it. be.

[Problem to be solved by the invention]

Conventional sludge scrapers, such as the screw conveyor type, have many sliding parts underwater, and these sliding parts are subject to severe wear, requiring effort and time for maintenance.
During this maintenance, all of the sewage in the pond will be drained, so the operation of the settling basin will be temporarily suspended.

The object of the present invention is to significantly reduce the number of sliding parts in water, thereby increasing the lifespan and improving reliability.

[Means to solve the problem]

The present invention has been made to achieve the above object, and includes a sludge and scraping cart driven by a linear motor that is movable in a reciprocating manner at the bottom of a pond, and which transports sludge to the sludge pit side. The gist is that a scraper is provided to move up and down depending on the running direction of the truck.

[For production]

A sludge scraping truck having a scraper for scraping up settled sludge is reciprocated by a linear motor, and the scraper is kept at a lowered position when the truck moves, and the sludge is scraped up to the sludge removal position by movement of the truck. When the cart returns, the scraper is held in the raised position, and when the cart returns, the sludge is scraped up in only one direction without scraping the sludge.

As a result, the number of sliding parts in water is significantly reduced compared to conventional systems, and wear is suppressed, resulting in a longer life and higher reliability.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, 1 is a settling basin with the required size and shape.
A sludge removal pit 2 lower than the bottom of the settling basin is formed at one end of the settling basin 1 in the longitudinal direction, and a sludge scraping truck is capable of reciprocating along the longitudinal direction of the sludge basin and along the bottom of the basin. Place 3.

This sludge scraping cart 3 is equipped with wheels 3W, and runs on the pond bottom or on rails R provided inside the pond bottom, and the driving power is supplied by a linear motor 7. It will be done. The linear motor 7 is installed vertically at the bottom of the sludge scraping cart 3 as in the embodiment shown in FIG. Water resistant molded. A reaction plate 8 for this linear motor 7 is arranged along the pond bottom and in the running direction of the truck.

A scraper 4 for scraping the sludge settled on the pond bottom into the sludge pit is movably mounted on the sludge scraping truck 3. This scraper 4 is swingably supported on the lower surface of the cart, and a scraper swinging device @ 6 is provided for swinging the scraper 4.
will be established.

This scraper 4 was set vertically or at an angle suitable for scraping sludge, and its tip was close to the pond bottom so that no scraping was left behind. Further, when the bogie returns, the scraper swinging device 6 is driven horizontally or at an angle that makes it impossible to scrape sludge so that the sludge is not moved to the anti-sludge pit side. Power is supplied to the scraper drive device 6 and the linear motor 7 through a power supply cable 9.

The embodiment shown in FIG. 2 has a linear motor 7 disposed inside the pond bottom and a reaction plate 8 disposed on the underside of the sludge scraping cart 3, and the other configurations are the same as the embodiment shown in FIG. be.

Therefore, as shown in Fig. 1 and Fig. 2-, the sludge scraping cart 3
When the scraper 4 is at the ground edge, the cart 3 is moved to the sludge pit side after the scraper 4 is set to the scraping position, and the sludge settled by the scraper 4 is scraped up and collected in the sludge pit. When the cart reaches the other end of the pond, that is, the pit position, the scraper 4 is raised and moved backward. Repeat this action two or more times to scrape the settled sludge out of the pit.
This is to be discharged outside the pond.

This reciprocating movement of the trolley 3 is performed by energizing the linear motor to apply a thrust to the reaction plate, and by changing the direction of energization between forward and backward travel.

In the embodiment shown in FIGS. 3 and 4, the axle 3W of the sludge scraping cart 3 is provided with a rail or track bed that is slightly raised from the bottom of the pond along the inside of the pond, and is supported on this rail. Linear motors 7 are provided protruding from the pond bottom surface and arranged in a line in the running direction of the bogie, and a reaction plate 8 is provided on the bottom surface of the bogie. A scraper 4 is swingably disposed so as to scrape the bottom of the pond on both sides of the linear motor arranged at the running position of the linear motor. This is done by bringing the striker into contact with the striker 10.10.

In other words, when the truck returns, when it reaches the end, the striker 10
The lever 5 is kicked to set the scraper in the scraping state, and when the cart reaches the ground, the lever is kicked by the striker and the striker is brought into a horizontal state.In this way, the running force of the cart is reduced. A part of the scraper 4 is used to automatically swing the scraper 4.

The swinging motion of the scraper 4 may be of a lever type in the embodiments shown in FIGS. 1 and 2, or may be of an electrically driven type in the embodiment shown in FIG. 3.

〔Effect of the invention〕

According to the present invention, the scraper provided on the sludge scraping cart that runs on the pond bottom with a linear motor is swung up and down depending on the running direction of the cart, so the cart only moves back and forth, and the sludge is removed. Since there are no sliding parts in the mud pit and no sliding parts in the water, and the drive system is non-contact, it has the advantage of extremely little wear, long life, and improved reliability.

The linear motor of the sludge scraping cart, which is driven by a linear motor, is installed slightly higher than the pond bottom, and the troughs on both sides are scraped with scrapers to collect the sludge. It has the advantage that raking can be done reliably.

[Brief explanation of the drawing]

The drawings show an embodiment of the sludge scraper of the present invention, and FIG.
FIG. 2 is an explanatory diagram of the second embodiment, FIG. 3 is an explanatory diagram of the third embodiment, and FIG. 4 is a side view of FIG. 3. 1 is a sand settling basin, 2 is a drainage pit, 3 is a sludge scraping truck, 4 is a scraper, 5 is a lever, 6 is a scraper drive device, 7
is a linear motor, and 8 is a reaction plate. Patent applicant Hitachi Mechanical Engineering Co., Ltd.

Claims (2)

[Claims] (1) A sludge scraping truck driven by a linear motor is installed on the bottom of the pond so that it can freely move back and forth, and a scraper that scrapes sludge toward the sludge pit is moved up and down depending on the traveling direction of the truck. A linear motor-driven sludge scraper characterized by: (2) The linear motor and rail are placed higher than the pond bottom, and the trough between the linear motor and rail is used as a trough.
Claim 1: The sludge is scraped up using a scraper.
The linear motor-driven sludge scraper described.