JPS602267Y2 - Reversible rake lifting type dust remover - Google Patents

Description

[Detailed description of the invention] This invention relates to a reversible rake-type dust remover.

Generally, a dust removal screen is placed in the waterways that take water into the upper and sewage treatment plants to prevent clogging of plant pipes, valves, nozzles, etc. and failure of pumps.
Large solid objects such as wood chips and pieces of wood are removed.

Furthermore, when a bar screen is used as a dust removal screen, screen scum captured by the screen is generally scraped up mechanically and removed.

The bar screen has a structure in which the upper part (rather than perpendicular to the flow direction of the water) is tilted toward the downstream side to facilitate scraping up and flotation of captured solids.

As a screen dregs remover, a device is generally used in which a comb-like rake is raked up along the inclined surface of the screen with an endless chino to scrape up and remove screen dregs.

In addition, the return part of the rake may be on the upstream side of the rising part or on the downstream side of the screen by straddling the screen.

In conventional screen scum removing machines, the rake is fixed to the chino, so when particularly thick solid objects are caught on the screen, for example when driftwood is washed in due to flooding, the rake removes these solid objects. Accidents often occur where the device gets caught in something and stops.

A screen scum removal machine that eliminates the drawbacks of the conventional technology was released in 1973.
This method has been proposed in Japanese Patent Application Laid-open No. 2-89221 and Japanese Patent Application Laid-Open No. 54-386399.

In some machines, both ends of the rake are attached to the lower ends of two arms, and the upper end of the arm is pivotally connected to the endless chain 7, so that when an oversized solid object is bitten, the rake can move the pivot point. In addition to allowing the rake to rotate around the center and escape, a means is also provided to limit the rotation range of the rake.

However, such a device has the disadvantage that not only is the rake not necessarily able to escape sufficiently, but also that it is difficult to completely remove the screen scum that has been raked up from the rake.

In view of these conventional drawbacks, this invention increases the rotation radius of the rake to increase the range of escape from obstacles, and also branches the guide rail in the discharge area above the screen to remove screen dust from the rake. The purpose of this is to smooth the discharge area and prevent the rake arm from getting caught in the discharge area.

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

FIG. 1 is a schematic side view of a reversible rake pulling type dust remover according to the present invention, and FIG. 2 is a perspective view showing how the rake is installed.
FIG. 3 is a plan view thereof, and FIG. 4 is a side view of the discharge area.

In FIGS. 1 to 4, 20 is a dust removal screen, and the dust removal screen 20 is disposed diagonally in a waterway flowing in the direction of arrow W, with its upper part tilted slightly downstream with respect to the water flow.

14a and 14b are a pair of upper and lower sprockets, and a pair of left and right endless checks 71 are bridged to the sprockets 14ai4b.

As shown in FIG. 2, an attachment 5 is fixed to the endless chain 71, and a pin 4 is fixed to the attachment 5.

Further, a chain roller 12 is rotatably provided on the pin 4, and a front end of a side plate 6 is swingably attached to the end of the pin.

A pin 8 is attached to the rear end of the side plate 6, a side plate roller 7 is rotatably provided to the pin 8, and a front end of a rake arm 3 is swingably provided to the other end of the pin 8.

Further, an arm roller 9 is rotatably provided at the rear end of the rake arm 3.

The chain roller 12, side plate roller 7, arm roller 9
As understood from FIGS. 2 and 3, they are arranged in a straight line so as to run on a guide rail 11, which will be described later.

Further, the side plate roller 7 has a roller width approximately half that of the chef roller 12, etc., and runs on the inner side of the guide rail 11, that is, the portion closer to the side plate than the center of the guide lane.

The rake arms 3 are arranged symmetrically, and the rake 3 is arranged rearward from the middle part of the rake arms 3 between them.

That is, the rake 2 is provided between the rake arms 3.

As shown in FIG. 1, the guide rail 11 is provided over the entire area in parallel with the endless chain 71.

Moreover, the guide rail 11 is located at the discharge area opening above the dust removal screen 20, as shown in FIGS. 1 and 4.
Only the travel path portion of the side plate roller 7 is branched and curved in a 4-shape toward the downstream side of the waterway to form a branch seal 11a.

In addition, in order to reach the return area of the rake, as shown in FIG.
Flanges 15a and 15b, which serve as guide rail substitutes, are provided at a and 14b in correspondence with the guide rail 11.

Note that A indicates the area raked by the rake.

At the discharge area opening, if a guide rail (not shown) is provided in addition to the guide rail 11, and the chain roller 12 and arm roller 9 are held between the two rails, the rake arm 3 and the side plate 6 are separated. When bent into a V-shape, the side plate roller 7 is moved by the rake arm 3.
The arm rollers 9 and 9 are strongly pressed by the branch rail lla and the guide rail (not shown), which may hinder the running and should be avoided.

Now, the drive motor (not shown) drives the sprocket 14.
As the endless checker 71 is driven, the endless checker 71 rotates in the direction of the arrow U, and the rake 2 is lifted up to scrape up screen debris accumulated on the screen 20.

During such an operation, if a large piece of dirt or the like is stuck on the dust removal screen 20 and a large force is applied to the rake 2, the rake arm 3 rotates about the pin 8 in the direction of arrow A and the rake 2 escapes.

When a larger force is applied, the side plate 6 also rotates in the direction of arrow A around the pin 4, allowing the rake 2 to escape further.

After passing the obstacle, the rake 2 rotates in the direction of arrow B due to its own weight, returns to its normal position, and continues the scraping operation.

Next, when the guide rail 11 reaches the outlet of the discharge area, the branch rail lla is branched and curved into a type 1 shape, so as the side plate roller 7 runs on the rail, the side plate 6 moves in the direction of the arrow due to the balance of the weight. The rake arm 3 falls in the direction of arrow C and falls from the rake 2 into a hopper (not shown) and is discharged from the system.

At this time, the screen residue may be scraped off with a wiper (not shown).

During this time, the side plate 6 and rake arm 3 travel in a ■-shape as shown in FIG. .

In this way, when it advances to the upper sprocket 14a, the side plate roller 7 and arm roller 9 move to the guide rail 11.
and is guided by the flange 15a of the upper sprocket, whereby the rake arm 3 and rake 2 rotate following the sprocket.

After reversing, the side plate roller 7 and arm roller 9 guided by the upper sprocket are guided by two guide rails 11 and 13 to the return area, and the side plate 6 and rake arm 3 remain aligned in the lower part. It reaches sprocket 14b.

As described above, according to the present invention, the turning radius of the rake 2 is extremely large compared to the conventional design, and the range of obstacles is also extremely large, and the rake 2 is also able to prevent the dumping at the outlet of the discharge area. This is done smoothly and completely, and there is no interference between the chain roller 12 provided on the rake arm and the side plate roller 7 at the outlet of the discharge area.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the dust remover according to the present invention, Fig. 2 is a perspective view showing how the rake is installed, and Fig. 3 is a plan view thereof.
FIG. 4 is a side view of the discharge area. 1 is an endless chain 7. 3 is a rake arm, 4 is a pin, 5 is an attachment, 6 is a side plate, 7 is a side plate roller, 8 is a pin,
9 is an arm roller, 11 is a guide roller, 11a is a branch rail, 12 is a chain roller, and 20 is a dust removal screen.

Claims (1)

[Scope of Claim for Utility Model Registration] In an inverted rake pulling type dust remover in which a dust removal screen is provided in a waterway and a rake scrapes the surface of the dust removal screen upward through an endless chain, (a) an attachment is provided on the endless chain; ,
A chenor roller is rotatably provided on a pin provided on the attachment, and a front end of a side plate is swingably provided on the pin, (b) a pin is provided on a rear end of the side plate, and a side plate roller is rotatably provided on one end of the pin. (C) A rake is attached to the rear of the intermediate portion of the rake arm, and an arm roller is rotatably provided at the rear end of the rake arm; (d) Install guide rails in parallel to the endless ceno, (
e) A reversible rake lifting type dust remover, characterized in that the guide rail has a branch rail of the side plate roller branched and curved in a discharge area above the dust removal screen.