JPS602268Y2 - Foreign matter scraping removal device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a contaminant removal device for a screen type automatic dust remover installed at a water intake of a sewage treatment plant or a pumping station.

Conventionally, as a screen-type dust remover installed at the intake of a river, lake, swamp, or various waterways, an endless checker 72 that rises along a screen 1 as shown in FIG. 1 is used. A scraper 7, which is rotatably supported by a support shaft 4 and fixed to a support arm 6 supported by a stopper 5, is formed so as to come into contact with the upper surface of the dirt scraping plate 3 fixed to the sprocket wheel. The scraper 7 slides on the upper surface of the foreign matter scraping plate 3 due to the lifting of the foreign matter scraping plate 3 as the endless checker 72 rotates due to the rotation of 8, and the foreign matter is collected on the foreign matter scraping plate 3. A structure that discharges and removes foreign matter 9 onto a chute 10 is widely used.

However, in the foreign matter scraping removal device having such a structure, after scraping off the foreign matter 9 on the foreign matter scraping plate 3, the scraper 7 rapidly rotates and falls due to its own weight together with the support arm 6, and collides with the stopper 5. Therefore, there was a drawback that a large noise was generated and the scraper 7 etc. were easily damaged.

Further, in the removing device having the structure shown in FIG. 1, since the support layer 6 is located inside and below the sprocket wheel 8,
When the dirt scraping plate 3 is turned over, the remaining dirt attached to the dirt scraping plate 3 may fall and accumulate on the support shaft 4, support arm 6, etc., causing malfunctions and causing the entire machine to be covered. When the cover is covered, there is a drawback that it is extremely difficult to remove foreign matters adhering to the cover.

Furthermore, during operation, the dust remover may stop due to overload due to foreign matter 9, but in this case, it is necessary to remove the overload by repeating forward and reverse operation.

However, with the conventional device shown in FIG. 1, the scraper 7 cannot be reversed unless it is lifted and fixed to a position where it does not interfere with the foreign object scraping plate 3, so quick measures cannot be taken, and maintenance and inspection are extremely inconvenient. There were many drawbacks, such as:

Furthermore, in the apparatus shown in FIG. 1, a structure is known in which a shock absorber is attached to reduce the collision of the scraper 7 and the support shaft 6 with the stopper 5, but the structure is complicated and expensive. Moreover, it had drawbacks such as a lack of long-term stability.

The contaminant scraping and removing device of the present invention solves these deficiencies of the conventional device, and its configuration will be explained based on FIGS. 2 and 3 showing one specific example.

A pair of endless chains 12 that rise along the screen 11 of a screen-type dust remover installed at the water intake of various waterways, etc.
a, 12b are upper sprocket wheels 13a, 13
b, and the pair of endless chinos 12a, 1
Preferably, a plurality of foreign matter scraping plates 14 are fixedly installed between 2b at a predetermined interval.

The dirt scraping plate 14 rises along the screen 11, preferably has rake teeth 15 that fit into the screen 11, and preferably has shoes 16 fixed to the top and side surfaces of its ends.

A pair of supporting arms is formed by a fulcrum P located above the axis A of the sprocket wheels 13a and 13b and outside the rotational orbit of the dirt scraping plate 14 at the rear (on the opposite side of the dirt discharge side). 17a and 17b are swingably supported.

These support arms 17a and 17b are provided with a precipitation portion 18 extending forward (on the foreign matter discharge side) of the rising axis Q of the foreign matter scraping plate 14.
The supporting arms 17a and 17b are the dirt scraping plates 1.
It is provided so as to intersect with the ascending axis Q6 of No. 4.

Note that the support arms 17a and 17b extend in a substantially straight line from the bent portion 18 to the sliding end 19 below.

Further, a scraper 20 is fixedly installed between the ends of the support arms 17a and 17b.

The scraper 20 is provided to slide on the dirt scraping plate 14 as the support arms 17a and 17b swing.

Then, a stopper 21 for determining the rest position of the support arms 17a, 17°b, that is, the lowering position of the support arms 17a, 17b and the scraper 20 in a non-contact state with respect to the dirt scraping plate 14, is installed on the support arms 17a, 17b. It is provided near the bent portion 18.

This stopper 21 is a support arm 17a. ) 17b and the scraper 20 are in a non-contact state with the foreign matter scraping plate 14, the scraper 20 is located at the rear (on the opposite side to the discharge side) on the foreign matter scraping plate 14, and the supporting arms 17a, 1
The support arm 17at17b is fixed at a position where the sliding end 19 of the support arm 7b contacts the upper end surface 22 of the dirt scraping plate 14 so as to support the support arm 17at17b.

It should be noted that shoes 2 are preferably provided at the sliding portions of the support arms 17a and 17b that make contact with the dirt scraping plate 14 to facilitate sliding.
3 are fixedly installed.

Further, a back plate 24 is installed above the screen 11, and a chute 25 for discharging foreign matter is installed at the upper end of the back plate 24.

The dirt scraping plate 14 is guided by a guide rail 26 so as not to deviate from a predetermined position.

Since the contaminant removal device of the present invention has the configuration described above, when the drive shaft 27 is rotated by an electric motor (not shown), the sprocket wheel 13a? 13
b rotates, the endless chinos 12a and 12b move, and the contaminant scraping plate 14 rotates and rises while scraping up the contaminants 28 collected on the screen 11.

When the upper surfaces 22 of both ends of the dirt scraping plate 14 touch the sliding ends 19 of the support arms 17a and 17b, the support arms 17a
, 17b upward, and the support arms 17a, 17b begin to rotate semicircularly about the fulcrum P.

Along with this, the scraper 20 slides on the foreign matter scraping plate 14, and the foreign matter 28 collected on the foreign matter scraping plate 14.
is automatically scraped onto the chute 25 by sliding of the scraper 20.

When the dirt scraping plate 14 further rises, the support arm 1
The linear inner shoes 23 of 7a and 17b slide down while contacting the end side surface 29 of the dirt scraping plate 14, and the supporting arms 17a and 17b are rotated to return to their original positions.

In this case, the contact surfaces of the support arms 17a and 17b with the end side surface 29 of the dirt scraping plate 14, that is, the shoe 23, are formed in a roughly linear shape, so that the dirt scraping after the dirt 28 has been scraped can be avoided. As the lift plate 14 rises, the support arms 17a, 17b slowly return to their original resting positions at approximately constant speed due to their own weight.

The support arms 17a, 17b are slidably supported by a fulcrum P located above and rearward of the axis A of the sprocket wheels 13a, 13b, and the fulcrum P follows the rotation trajectory of the dirt scraping plate 14. Since it is placed on the upper and outer side, the foreign matter 28 and the like serve as the fulcrum P or the support arm 17a.

Since it does not adhere to the parts such as 17b, there are fewer breakdowns and maintenance is easy.

In addition, if an automatic dust remover stops due to overload during operation, it is common to repeatedly operate it in forward and reverse directions to remove the overload.
Since the foreign matter scraping plate 14 and the support arms 17a, 17b continuously slide, the foreign matter scraping plate 14 is
It is possible to smoothly and immediately reverse the rotation at any position in b.

The effects of the foreign matter scraping device of the present invention are as follows.

(1) In the device of the present invention, the support arms 17a and 17b that support the scraper 20 are pivoted at a fulcrum P located above and behind the axis O, and the support arms 17 are bent forward on the discharge side. Since the protruding curved portion 18 is provided, the shoe 23 provided on the back surface of the support arm 17 collides with the scraping plate 14, and as the scraping plate 14 rises, the foreign matter on the foreign matter scraping plate 14 is removed. After scraping with scraper 20, support.

As the arm slowly returns to its original position, stopper 21
The protruding part of the curved part 18 will not collide with the protruding part of the curved part 18 and generate a large noise.

Therefore, unlike the conventional device shown in FIG. 1, the support arm 6 does not collide with the stopper 5 and make a large noise, or the support arm 6 is not damaged or scorched due to this.

(2) Also, according to the present invention, since the fulcrum of the scraper support arm is located above and rearward from the axis O, residual deposits adhering to the scraping plate fall and accumulate above the support arm etc. when the scraping plate is turned over. This reduces the number of troubles caused by the adhesion of raking residue.

(3) Also, since the fulcrum of the support arm is located upward and backward,
It can easily and quickly stop the process when there is an overload from scraping up foreign matter, and repeat forward and reverse rotations to remove the overload.

(4) In the present invention, there is no support arm or the like inside the wheel and chain of the raking device, so maintenance and inspection are easy and it can be used stably.

(5) When the fulcrum of the support arm is located upward and backward, the device structure is simple, which has the advantage of low manufacturing cost and short delivery time.

(6) When the scraping plate rises along the rising axis Q, the foreign matter is scraped off by the sliding movement of the scraper, and as the scraping plate rises, the weight of the support arm causes the foreign matter to be scraped off.
Since it slowly returns to its original resting position while contacting the scraping board, no noise is generated.

As explained above, the foreign matter scraping and removal device of the present invention does not make a lot of noise because the support arm slowly returns to its original position after scraping off the foreign matter on the foreign matter scraping plate with the scraper. In addition, it is less prone to malfunctions because fallen foreign matter is less likely to adhere to the support arm, and furthermore, no matter where the foreign matter scraping plate stops, it can immediately reverse rotation, allowing for quick failure recovery. It has many advantages, such as being able to easily remove contaminants, etc. by easily attaching it to screen-type dust removers at water intakes of various waterways, making it extremely useful industrially. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a specific example of a conventional foreign matter scraping and removing device, and FIGS. 2 and 3 are explanatory diagrams showing one specific example of the foreign matter scraping and removing device of the present invention. 1.11... Bar screen, 2, 12a, 12b.
...Endless Cheno, 3,14...Contaminant scraping board, 4...
・Support shaft, 5, 21...Stopper, 6, 17a, 17
b... Support arm, 7, 20... Scraper, 8, 13
a, 13b... Sprocket wheel, 9.28...
・Contaminants, 10, 25... Chute, 15... Rake tooth, 16... Shoe, 18... Support arm bent part, 1
9... Sliding end, 22... Upper surface of the end of the dirt scraping plate, 2
3... Support arm side shoe, 24... Back plate, 26...
Guide rail, 27... Drive shaft, 29... End side of dirt scraping plate, O... Sprocket wheel axis, P
... Support arm fulcrum, Q... Lifting axis of the dirt scraping plate.

Claims (1)

[Scope of utility model registration request] A dirt scraping device in which rake teeth, supported at both ends by endless chains 12a, 12b driven by sprocket wheels 13a, 13b, protrude rearward to mesh with the bar screen on the front surface of a bar screen 11 installed at an angle in the waterway. In an apparatus that includes a plate 14 and circulates it endlessly up and down along a bar screen to scrape and remove foreign matter, a scraper 20 for sweeping the upper surface of the scraper plate 14 is supported. The support arms 17a and 17b are pivoted at a fulcrum P located above and behind the axis 0 of the sprocket wheels 13a and 13b, and the scraping plate 1
The support arms 17a and 17b are provided with bent portions 18 extending forward from the rising axis of the support arms 17a and 17b, and the appropriate positions of the bent portions 18 of the support arms are brought into contact with the stoppers 21.
a and 17b are constructed such that when the scraper 20 hangs down from the fulcrum P due to its own weight, the tip of the scraper 20 abuts the upper surface of the scraping plates 17a and 17b, and the support arm side is located in front of the sliding end 19 of the scraper support arm. A shoe 23 is provided so that the tip of the scraper 20 of the support arms 17a, 17b collides with the upper surface of the rising scraping plate 14 to discharge foreign matter forward of the rising axis Q. As the plate 14 passes over the sliding end 19 of the supporting arms 17a, 17b and rises along the supporting arm shoe 23, the supporting arms 17a, 17b supported by the fulcrum P move the lifting plate 14 due to its own weight. A contaminant removal device configured to move rearward of the upward axis Q.