JPH07102629A - Noise suppressing mechanism of automatic dust collector - Google Patents

Abstract

PURPOSE:To mitigate impact noise at the time of reversing a rake by reversing the rake while supporting a rake main body on a projection by way of installing a plate provided with the projection on the extreme outer edge on an upper step sprocket rotation shaft. CONSTITUTION:On a plate 5, against a diametrical directional line 1ao connecting a center (a) and a center (b) therebetween, a diametrical directional line 1ai connecting the center (a) and a projection 5a is made to advance toward the forwarding direction of a rake 2 at an angle of rotation alpha. When a pin 1e of the rake 2 comes to a position where the rake is reversed from the state to advance into a pitch circle 1D, as a moment 1j works on the rake 2, consequently, a back surface 2h of the rake 2 is positioned to make contact with the projection 5a. At this time, in comparison with a travel distance for the rake 2 to reverse until a roller 2d makes contact with the outer periphery of a boss, a travel distance for the back surface 2h to hit the projection 5a at the reversing time is sufficiently small, and by the amount of the travel to reverse which is shorter, inertial force at th time of reversing becomes smaller, and by the amount it becomes smaller, impact noise becomes smaller. At the time of alpha=0, the impact noise becomes zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise suppressing mechanism of an automatic dust remover for removing dirt or foreign matter in waste water.

[0002]

2. Description of the Related Art FIG. 4 is a side sectional view showing a lower portion of a conventional automatic dust remover, wherein wb indicates the bottom of a sewage channel, and a screen 3 is provided midway in the flow direction b of the channel. It is provided. FIG. 8 shows a sectional view of the upper part of the automatic dust remover. The screen 3 in FIG. 4 shows its arrow view in FIG. 6, and a plurality of screen plates 3A are provided in the shape of a fence, and the screen plates 3A are arranged between the left and right directions. The water flow passes through the gap 3a, and the fence-shaped screen plate 3A receives filth or foreign matter contained in the sewage flow.

Sprockets 1A are provided on both sides of the upper rotary shaft 1a (FIG. 8) (in a direction perpendicular to the paper surface of FIG. 8).
, And the sprocket 1B is also fitted to the left and right sides of the lower rotary shaft 1b (FIG. 4), and the chain 1C (one point is attached to the upper sprocket 1A and the lower sprocket 1B, respectively, left and right respectively. (Indicated by a broken line). The illustrations in FIG. 4 and FIG.
Of the left and right sprockets, the left side is shown when viewed from the upstream side of the screen 3, and these configurations are symmetrical.

In each of the left and right chains 1C, the pins 1e fixed to the chain 1C have the pins 1e at the left and right ends of the rake body 2A as shown in the cross section of FIG.
It is fitted so as to allow swinging rotation around e (rotation in the direction of arrow e). Further, the fitting of the pin 1e into the rake body 2A in FIG. 7 is also symmetrical in the left-right direction (left-right direction of the paper surface in FIG. 7).

In the rake body 2A, rollers 2d and 2e are provided before and after the chain 1C in the traveling direction. These rollers 2d and 2e travel on rails 1c, 1
They are in a relationship of being guided and traveling on d, 1g, 1h, 1i and 1j. Also, these rails 1c, 1d,
1g, 1h, 1i and 1j are also left and right (see FIG. 4 or FIG.
(Direction perpendicular to the paper surface of) is provided symmetrically. A rake plate 2B is fixed to the front of the rake body 2A in the traveling direction,
A view of the key board 2B in FIG. 4 is shown in FIG. 5, and a weight 2f is fixed to the rake body 2A.

In the wiper device 4 (FIG. 8), the arm 4B is fitted to the pin 4b so that the arm 4B can swing. Arm 4B
Is urged by a spring 4c toward the side of the chain 1C, and a wiper 4A is fixed to the tip of the arm 4B.

The operation of the above conventional example will be described below. When the rotary shaft 1a is driven, the upper sprocket 1A rotates in the direction of rotation d to drive the chain 1C, and the driving of the chain 1C causes the lower sprocket 1B to rotate in the rotational direction a. In this drive, each rake 2 is also driven integrally with the pin 1e fixed to the chain 1C.

By driving the rakes 2, on the side of the lower sprocket 1B, the respective rakes 2 have the postures shown in FIG. 4, and the screen 3 from the front side of the sprocket 1B.
Turn over to. The change in the posture of the rake 2 which is being reversed is due to the fact that the rollers 2d and 2e in the rake 2 are raked.
This is done by being guided by the rules 1c and 1d.

After the posture of the sprocket 1B is reversed, the rake 2 rises on the screen 3 as shown in FIG. In this case, the rake plate 2B of the ascending rake 2 maintains the posture in which the rake plate 2B is perpendicular to the screen 3 while the pawls 2a are moved as shown in FIG. Each of them goes up on the screen 3 while being inserted into the gap 3a in the screen 3. Further, this ascending action has the effect that the rake plate 2B scoops up the dirt or foreign substances collected by the screen 3 described above.

The rake 2 located in the lower part of FIG.
The final position where the screen 3 is scooped up is shown, and its posture results from the following actions.
Regarding the position of the pin 1e in the rake body 2A, the roller 2e on the roller 2d side of the rake body 2A is centered on the pin 1e.
It is provided so that it becomes heavier with respect to the side. In particular,
The weight 2f is fixed to the roller 2d side of the main body 2A so that the weight distribution is emphasized so that the weight distribution becomes heavier on the roller 2d side.

Also, as shown in FIG. 8, the sprocket 1A
The tilt angle of the chain 1C at a position away from the horizontal plane is about 70 degrees. For this reason, when the roller 2d separates from the rail 1h, the rake body 2A
The weight 2f has a falling posture due to its weight. However, in the rake 2, the roller 2e is the rail 1g.
By being guided while being supported by, the robot keeps the posture as shown and rises.

In such a final posture of scraping up the dirt, the surface 2g of the rake plate 2B has the tip 4a of the wiper 4A.
Reach the position of contact with. From this state, the rake 2 is further held with the claw 2a side of the rake plate 2B facing downward.
Of the wiper-4A, the tip 4a of the wiper-4A is pushed by the surface 2g. As a result, the wiper 4A swings around the pin 4b in the direction of the arrow e, and this action causes the tip 4a to relatively wipe off dirt and the like adhering to the surface 2g. , The wiped off waste accumulates in the collection place just below.

The rake 2 having been scraped up into the dirt enters the range of the pitch circle 1D of the sprocket 1A, is inverted as shown in FIG. 8, and the above cycle is repeated. here,
The ray which has come to the reverse position on the sprocket 1A in FIG.
In the key 2, the moment c around the pin 1e acts by the weight of the front side with the weight 2f.

As a result, depending on the moment c,
When the la 2d hits the boss outer periphery 1f of the sprocket 1A,
The reversal ends. In this case, as shown in FIG. 9 of the Nini cross section of the sprocket 1A, the roller 2d (the roller 2 shown in phantom in FIG.
While the d) remains on the boss outer periphery 1f, the rake 2 turns over on the sprocket 1A. Further, after the rake 2 is separated from the pitch circle 1D of the sprocket 1A by driving the sprocket 1A, the rollers 2d and 2e are guided by the rails 1g and 1j while maintaining their returning postures. Do it.

[0015]

As described above, when the rake 2 is reversed in the sprocket 1A in the upper stage, the roller 2d impacts the outer periphery 1f of the boss due to the moment c. That is, the impact causes noise. This may cause a noise problem to a neighboring residential area, especially since the automatic dust remover continuously operates even at night. An object of the present invention is to provide a noise suppressing mechanism for an automatic dust remover capable of suppressing impact noise when the rake 2 is reversed as described above.

[0016]

The present invention is an improvement of the conventional automatic dust remover, and the conventional automatic dust remover has the following configuration. A plurality of screen plates, which are in the flow of sewage and collect the filth contained in the sewage, are provided in the shape of a fence to form a screen (3). A drive device portion of a rake (rake) for scooping up dirt collected by the screen is provided on the upstream side front surface of the screen, and the drive device portion has the following configuration.

The sprocket fitted to the left and right of the lower rotation shaft and the sprocket fitted to the left and right of the upper rotation shaft are respectively chained around the upper and lower sprockets on the left and right respectively. There is. In both the left and right chains, pins (1e) are fixed toward the insides of the left and right, and the left and right sides of the rake body (2A) swing around the pins on the pins on both sides. Can be fitted.

The rake body has a flat back surface (2h) toward the sprocket side, and a rake plate (2B) is fixed in the direction orthogonal to the back surface, and the rake plate (2B) is fixed thereto. The claw plate is provided with a claw at the tip facing the outside of the sprockets. Further, a roller is provided which runs on the rail in the front-rear direction in which the chain of the rake body advances. The direction in which the rake plate is raised by driving these chains is such that the claws of the rake plate scoop up the dirt collected in the screen.

In such an automatic dust remover, the following improved mechanism is attached. Pre-installed on the upper rotary shaft
And the plate has its outermost radial edge in contact with the back surface of the rake body when the pins in the chain are located on the pitch circle of the sprocket in the upper stage. It is a protrusion. The position of the projection in the circumferential direction of rotation includes the line connecting the center of the pin on the pitch circle of the sprocket and the center of rotation of the upper stage rotary shaft, and is located on the front side in the traveling direction of the rake body from that position.

[0020]

EXAMPLE FIG. 1 shows an upper sprocket 1 corresponding to FIG.
A side sectional view of the portion A is shown, and 1D is the same as the pitch circle 1D of the sprocket 1A in FIG. The automatic dust remover used in the present invention is different from the conventional automatic dust remover described above in that the plate 5 is newly fitted to the rotary shaft 1a in FIG. All of the configurations are the same as the configurations described in FIGS. 4 to 9. Therefore,
In order to avoid duplication of description, description of the parts of the automatic dust remover already described will be omitted. Note that FIG. 2 is a view of the plate 5 in FIG.

In FIG. 1, the dimension r between the center of rotation a of the rotary shaft 1a and the projection 5a at the outermost edge of the plate 5 is the radius R of the pitch circle 1D of the sprocket 1A.
Then, the value r = R-s is obtained by subtracting the dimension s between the chain 1C and the back surface 2h of the rake body 2A.

The operation of the above embodiment of the present invention will be described below. The action of the rake 2 scooping up the dirt collected in the screen 3 is exactly the same as the action described in FIG. In addition, in FIG.
The wiper 4A wipes off the dirt collected on the rake plate 2B in the same manner as in the present invention.

The position of the rake 2 shown by the solid line in FIG. 1 indicates the first position where the pin 1e of the rake 2 enters the pitch circle 1D of the sprocket 1A after the dirt is wiped off. . Even at the position immediately before reaching the position of the rake 2 shown by the solid line, the rake 2 enters the pitch circle 1D in the posture of the rake 2 shown by the solid line. Further, since the sprocket 1A rotates in the g direction, the projection 5a rotates like 5ao immediately before the pin 1e enters the pitch circle 1D. That is, immediately before the pin 1e enters the pitch circle 1D, the protrusion 5a and the back surface 2h of the rake 2 sequentially approach each other, and the pin 1e reaches the first position where it enters the pitch circle 1D of the sprocket 1A. Reaching, the back surface 2h has a protrusion 5a
Is in contact with.

The rake 2 shown by the solid line is g of the rotary shaft 1a.
By the rotation in the direction, the laser passes through the position of the rake 21 shown in the phantom line and moves away from the pitch circle 1D.
The posture is reversed up to the position of key 22.
In addition, after the reversal is completed, the pitch goes out from the pitch circle 1D.
With respect to the attitude of the key 2, the rollers 2d and 2e are guided by the rails 1j and 1g (FIG. 8), and the guide is the same as the conventional one. While reversing in this way, the lake 2 rotates around the pin 1e as described above.
Ment h acts. By this action, the back surface 2h acts on the protrusion 5a to rotate the plate 5 in the direction of arrow i.

However, the plate 5 is integrally fitted to the rotary shaft 5, and the plate 5 can be regarded as a rigid body. Therefore, even if the plate 5 is intended to be rotated in the i direction by such a moment h, it is not so rotated, and the plate h supports the moment h. . The same applies when a moment in the direction opposite to the moment h acts around the center b.

This means that the rear surface 2 is connected to the radial line 1ao connecting the center of rotation a of the rotating shaft 1a and the center b of the pin 1e.
The above-mentioned reversal action is carried out while maintaining the posture in which h is in the vertical direction. That is, at the position of the rake 21, the radial line 1a1 connecting the center a and the center b and the back surface 2h are orthogonal to each other, and the posture thereof maintains the orthogonal posture up to the position of the rake 22. As described above, when the rake 2 is reversed, the rear surface 2h keeps the posture in which the rear surface 2h is orthogonal to the radial line 1ao from the center a, and therefore the roller 2d is rotated by the sprocket 1A. The phenomenon of hitting the boss outer periphery 1f does not occur.

In the above embodiment, the projection 5a on the plate 5 is formed by the pin 5e when the pin 1e enters the pitch circle 1D.
It suffices that the rotary shaft 1a be driven so as to coincide with the radial line 1ao connecting the center a and the center b. If such a relationship is established, a large number of protrusions may be provided on the plate 5 and the plate 5 may be configured like a polygon 5A shown in phantom. That is, the protrusions of the polygon 5A are the outermost edges 5a1, 5a of the polygon 5A.
a2 and the like.

In the embodiment shown in FIG. 1, the position of the projection 5a in the circumferential direction of rotation is located on the radial line 1ao connecting the center a and the center b. However, this protrusion 5a
The position in the rotation circumferential direction may be located on the front side in the traveling direction of the rake 2 with respect to the radial line 1ao.
In FIG. 3, as described above, in the plate 5, the rake 2 advances along the radial line 1ai connecting the center a and the protrusion 5a with respect to the radial line 1ao connecting the center a and the center b. The case where the rotation angle α is advanced toward the direction is shown.

The operation in FIG. 3 is as follows. At the position where the pin 1e of the rake 2 has just entered the pitch circle 1D, the protrusion 5a is advanced by the rotation angle α with respect to the radial line 1ao, so the rake 5a is still raked. It has not reached the point where the rear surface 2h of 2 touches. From this state,
When the rake 2 comes to the position of the rake 2 shown by an imaginary line where it is reversed, the rake 2 is moved by the weight on the front side where the roller 2d having a large weight distribution around the pin 1e exists. Ki 2
Moment 1j acts on.

As a result, the back surface 2h of the rake 2 has the projection 5a.
The posture is such that it touches (shown in phantom). After that, until the rake 2 comes out of the pitch circle 1D, the rake 2
Due to the weight of the front side of the rear surface 2h, the rear surface 2h maintains the posture in which the rear surface 2h is in contact with the protrusion 5a. In addition, from the position of the rake 2 shown by the solid line to the position of the rake 2 shown by the phantom line, the rear surface 2
When h hits the protrusion 5a, some impact sound is produced.

However, in comparison with the reverse travel distance of the rake 2 until the roller 2d hits the boss outer periphery 1f by the moment c described in FIG. The travel distance is small enough. This is because the distance from the pin 1e to the protrusion 5a is shorter than the distance from the pin 1e to the roller rotation center of the roller 2d. Therefore, the shorter the reversing stroke, the smaller the inertial force at the time of reversing, and the smaller the inertial force, the smaller the impact noise.

Further, the rotation angle α can be made small by design. The smaller the rotation angle α is, the smaller the impact sound due to the reversal is, and the impact at the reversal becomes zero when α = 0 as described above.

Also in the embodiment of FIG. 3, the protrusion 5a is the same as 5a1 or 5a2 described in FIG.
May be polygonal corners of a plate forming a polygon. That is, when such a polygonal plate is used, the pin 1e of the rake 2 is the pitch circle 1
In the state of being in D, those corners and the rotary shaft 1
The line connecting the rotation center a of a may be advanced by the rotation angle α with respect to the line connecting the center a of the rotation shaft 1a and the center b of the pin 1e.

[0034]

As is clear from the above description, the noise suppressing mechanism of the automatic dust remover according to the present invention has the following effects. When the plate 5 having the projection 5a at the outermost edge is attached to the upper sprocket rotating shaft 1a in the conventional automatic dust remover, when the rake body 2A is inverted on the pitch circle 1D, the rake body is 2h is the protrusion 5a
Since it is inverted while being supported by the
The impact noise at the time of reversing can be reduced or suppressed. In addition, reducing or suppressing the impact when the sprocket 1A is turned over as described above reduces the fatigue of the material due to the impact and also improves the durability of the sprocket 1A.

[Brief description of drawings]

FIG. 1 is a diagram showing a noise suppressing mechanism of an automatic dust remover according to the present invention.
FIG. 3a is a side sectional view of a portion where a plate 5 of the present invention is attached to a.

FIG. 2 is a view showing a plate 5 in FIG.

FIG. 3 is a side sectional view showing another embodiment of the present invention corresponding to FIG.

FIG. 4 is a side sectional view showing a lower portion of a conventional automatic dust remover.

5 is a view of the rake plate 2B in FIG. 4 as viewed in the direction of arrow A. FIG.

FIG. 6 shows a view of the screen 3 in FIG.

FIG. 7 is a cross-sectional view of the rake 2 shown in FIG.

FIG. 8 is a side sectional view showing an upper part of a conventional automatic dust remover.

9 is a Nini cross-sectional view of the sprocket 1A in FIG.

[Explanation of symbols]

1A and 1B sprockets, 1C chain,
1D pitch circle, 1a and 1b rotation axis, 1c,
1d, 1g, 1h, 1i and 1j rail, 1e pin, 2 lake, 2A lake body, 2B laser
Plate, 2a nail, 2d and 2e roller, 2h
Back, 3 screen, 3A screen plane
G, 3a gap, 5 plate, 5a protrusion.

Claims (1)

[Claims] 1. A screen (3) for collecting the waste contained in the flow of wastewater by providing a screen plate in the shape of a fence, and a sprocket fitted to the left and right of the lower rotary shaft, respectively. , The upper sprocket that is fitted to the left and right of the rotating shaft, respectively, wrap the chain (1C) around the upper and lower sprockets for the left and right respectively, and in both the left and right chains, turn them toward the inside of the left and right. The left and right sides of the rake body (2A) are fitted to the pins (1e) on both sides, which are firmly fixed together, so that the rake body can swing around the pins. A rake plate (2B) having a flat-shaped back surface (2h) toward the side of the sprocket, and a tip provided with a claw at the tip facing outward of the sprocket in a direction orthogonal to the back surface is fixed, And on the lake body The chain has a structure in which a roller for traveling on the rail is provided in the front-rear direction in which the chain advances, and the direction in which the rake plate is raised by driving the chains is such that the claws of the rake plate are In the automatic dust remover in which the dirt collected in the screen is scooped up, the pin is located on the upper stage rotary shaft on the pitch circle of the sprocket in the upper stage. When in the state, the plate (5) having a protrusion whose outermost edge in the radial direction is in contact with the back surface of the rake body is fitted, and the position of the protrusion in the circumferential direction of rotation is on the pitch circle. A noise suppressor for an automatic dust remover, which includes a line connecting the center of the pin and the center of rotation of the upper rotary shaft, and is located forward of the line in the traveling direction of the rake body. mechanism.