JPH0586243B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention removes scum in a sedimentation tank by automatically rotating a pipe scum skimmer in both forward and backward directions as the scum collection device moves in flight. This invention relates to a scum skimmer that collects scum that floats in both the side and downstream directions.

[Conventional technology]

The scum skimmer in the sedimentation basin has a scum collection hole bored on one outer circumferential surface in the longitudinal direction, and the scum collection hole is always facing upward, and when collecting scum, the pipe scum skimmer is tilted forward to remove the scum floating on the water surface. We are trying to collect. Generally, this pipe scum skimmer is periodically and manually rotated to open and close the scum collection hole, and this opening/closing operation is performed by a worker periodically or by detecting the amount of floating scum.

[Problem that the invention seeks to solve]

This has the disadvantage that it requires too much effort on the part of the workers. In recent years, with the trend toward automation in treatment plants, there has been a demand for scum skimmers that can be easily retrofitted to existing equipment. To solve this problem, a method has been proposed in which the scum skimmer is opened and closed using an electric or hydraulic operation separate from the drive source of the sludge scraper, but this method is unsuitable from an energy-saving perspective. .

The present invention automatically swings the pipe scum skimmer using the power that drives the flight without using any other power, and efficiently removes floating scum floating in both the upstream and downstream sides of the pipe scum skimmer. The purpose is to collect well.

[Means for solving problems]

The present invention provides a scum skimmer that scrapes floating scum floating on the water surface with flights attached to the chain of the chain conveyor and collects the floating scum with a pipe scum skimmer installed downstream. two sets of strikers arranged at intervals, two sets of link devices connected to the pipe scum skimmer, and one set of link devices provided on the arm of one of the link devices, which comes into contact with the one striker group to operate the pipe scum skimmer. A protrusion that causes the pipe scum skimmer to tilt forward; a protrusion that returns the pipe scum skimmer in the backward tilting position to the neutral position; The gist is that it is composed of a protrusion that operates the pipe scum skimmer and a protrusion that returns the pipe scum skimmer in the forward tilted position to the neutral position.

[Effect]

Since the scum skimmer of the present invention is configured as described above, as the flight travels, two groups of strikers arranged at a required interval are moved on the chain of the chain conveyor on which the flights are fixed. By tilting the pipe scum skimmer forward or backward through a link device including an arm having a contacting projection, floating scum scraped up by the flight is collected into the pipe scum skimmer. In this case, since the pipe scum skimmer is automatically oscillated using the power that drives the flight, there is no need to provide another power source. Furthermore, the duration and period of forward and backward tilting of the pipe scum skimmer and the ratio of the number of forward and backward tilts can be arbitrarily selected by appropriately setting the arrangement position of the striker.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4 of the drawings.

In the figure, 1 is a sedimentation tank, and 2 is a scum scraper installed in the longitudinal direction of this sedimentation tank or in any direction. A large number of flights 23 are arranged at regular or arbitrary intervals on two chains 22a and 22b, and when the chains are driven, the flights 23 for collecting sludge collect the scum floating on the water surface toward the pond end side, In addition, there is a scum collection device that scrapes the scum toward the scum removal position. Of course, during this scum scraping, the flight is in the floating position.
And this flight 23 has two parallel ends.
A plurality of strikers 3a, 3b are fixed to the chain 22 in a protruding manner arranged at required intervals in the longitudinal direction of the chain.

The positions and pitches of the strikers 3a, 3b provided on each chain 22a, 22b are set according to the forward tilt-return and backward tilt-return cycles of the scum skimmer. That is, the striker 3a provided in the chain 22a rotates the scum skimmer upstream (tilting forward), and also has the role of returning the skimmer that has rotated downstream (tilting backward) to the neutral position. Striker 3 provided on the other chain 22b
b returns the skimmer that has tilted forward to the neutral position and tilts the skimmer backward. This striker 3a, 3
b is provided protrudingly from the side surfaces of the chains 22a, 22b, and is provided at any pitch on the link side surface or pin shaft of the link chain, regardless of the pitch of the flights 23.

The sprocket wheels 21a and 21b that engage the chains 22a and 22b are supported by a single shaft 24, and the shaft 24 has a shaft 24 having a shaft 21a and 4b extending outwardly from each of the sprocket wheels 21a and 21b.
As shown in the figure, it is rotatable about a shaft 24 to support bosses 41a and 41b, and arms 42a and 42b are provided to protrude from each boss 41a and 41b. The arm 42a of this boss 41a and the boss 41
The protruding angle with respect to the shaft 24 is different from that of the arm 42b of b. That is, the arm 42a is the striker 3a.
so that the scum skimmer rotates upstream and returns to the neutral position or tilts forward at an appropriate angle,
Further, the arms 42b each define two stages of protrusions at angles suitable for the scum skimmer to be rotated downstream by the striker 3b and returned to the neutral position or tilted backward. An example of this state is shown in FIGS. 2 and 3.

In addition, the bosses 41a and 41b each have a lever 4.
3a and 43b are provided in a protruding manner, and rods 44a and 44b are engaged with the tips of the respective levers. The tips of each rod 44a, 44b are pivotally connected to a bracket protruding from the pipe scum skimmer.

The pipe scum skimmer 5 has bearings 6 on both ends.
6, a scum collection port 5H is bored on the outer periphery, and the brackets 51a,
51b is provided protrudingly, but these brackets 51a,
The punching direction of 51b is also suitable for swinging upstream or downstream, respectively.

In this embodiment, two sets of link devices connected to the pipe scum skimmer are connected to arms 42a and 4.
2b, levers 43a, 43b, rods 44a, 4
4b, and brackets 51a and 51b.

Floating weirs 71 and 72 are provided on the upstream and downstream sides of the pipe scum skimmer 5 in parallel with the scum skimmer 5, and floats 71F and 72F are provided on the floating weirs 71 and 72.
Using the buoyancy of the second floor, the floating weir follows the water level and floats and sinks.

Furthermore, fixed weirs 81 and 82 are arranged parallel to the floating weirs 71 and 72 on the scum skimmer side. Seal 9
1,92 is provided. Therefore, this flexible seal (plate-like body) is used between this fixed weir and the pipe scum skimmer.
It will be sealed in water. The fixed weir and flexible seal are set at a position slightly lower than the lowest point of the scum collection port so that water flow over the floating weir forms a slope that flows directly into the collection port. As a result, the water flow containing scum that has passed over the floating weir flows over the flexible seal into the scum collection port 5H of the pipe scum skimmer and is collected when descending the head by the floating weir and the fixed weir. At this time, the scum skimmer is rotated upstream or downstream, and the scum collection port is tilted forward toward the upstream side or backward toward the downstream side from the upper position, and the scum can be smoothly recovered.

Next, the operation of the embodiment will be explained.

First, the striker 3a contacts the protrusion 48a provided on the arm 42a from the neutral position shown in FIG. 2, and when the arm 42a rotates clockwise, the scum skimmer 5 rotates upstream and tilts forward. After a predetermined period of time has elapsed, the arm 4 will be in the state shown in FIG.
The striker 3b provided on the chain 22b comes into contact with the perforation 47b of the chain 22b, and rotates the arm 42b clockwise. As a result, the scum skimmer 5 rotates downstream and returns to the neutral position.

Next, the striker 3b provided on the chain 22b
(not shown) comes into contact with the protrusion 48b, the scum skimmer 5 rotates further downstream and tilts backward.

Return from this rearward tilted position is performed by the striker 3a coming into contact with the protrusion 47a.

By appropriately setting the placement position of the striker, it is possible to not only repeat the rocking motion of forward tilt-return-backward tilt-return, but also to control the duration and period of forward tilt and backward tilt, as well as the forward tilt and The ratio of the number of backward tilts, for example, three forward tilts to one backward tilt, can be arbitrarily selected.

〔Effect of the invention〕

According to the present invention, the pipe scum skimmer is automatically swung using the power that drives the flight without using any other power, so that the pipe scum skimmer 5 floats in both the upstream and downstream sides. Floating scum can be collected. In particular, since the striker is installed in the chain of the chain conveyor with its flight fixed, the striker's installation position can be set freely, which allows the pipe scum skimmer to continue tilting forward and backward. The time and period, and the ratio of forward and backward tilting times can be arbitrarily selected, and floating scum can be efficiently collected while maintaining an appropriate amount of water flowing into the pipe scum skimmer.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the scum skimmer of the present invention, FIGS. 2 and 3 are side views thereof, and FIG. 4 is a sectional view thereof. 1 is a sedimentation tank, 2 is a scum scraper, 22a, 22
b is chain, 23 is flight, 3a, 3b is striker, 42a, 42b is arm, 43a, 4
3b is a lever, 44a, 44b are rods, 47
a, 47b, 48a, 48b are projections, 5 is a pipe scum skimmer, and 51a, 51b are brackets.

Claims (1)

[Claims] 1. In a scum skimmer that scrapes up floating scum floating on the water surface with flights attached to the chain of a chain conveyor and collects the floating scum with a pipe scum skimmer installed on the downstream side, Two sets of strikers attached to the pipe scum skimmer, two sets of link devices connected to the pipe scum skimmer, and an arm of one of the link devices make contact with the one striker group to tilt the pipe scum skimmer forward. a projection that returns the pipe scum skimmer in a rearward tilting position to a neutral position; and a projection that is provided on the arm of the other link device and that contacts the other group of strikers and tilts the pipe scum skimmer backward. and a protrusion for returning the pipe scum skimmer in a forward tilted position to a neutral position.