JPH0762722A - Manufacture of screen frame for automatic cleaner such as sewage remover - Google Patents

Abstract

PURPOSE:To ease manufacturing work by welding screen fixing bars, to which screen plates arranged in the axial direction are welded, to both side plates in such a manner that a virtual axis after the weld-deformation becomes the normal axis, i.e., both axes coincide with each other. CONSTITUTION:With respect to an axis (c) of a fitting hole 1E at a side plate 1E, another axis ci at an opening hole 1Fa of another side plate 1F is set deviated upward by the amount of (s), or the amount of weld-deformation corresponding to an axial distance Ls. A plurality of screen fixing bars 1G are placed between two side plates 1F and 1E in the axial direction, and both ends of each screen fixing bar 1G are welded to the side plate 1E and side plate 1F. Next, the screen plate 1D are welded to the fixing bars 1G at respective points of the screen fixing bars 1G, ensuring a clearance-gap ps in the direction of a virtual axis (i). The time necessary for thread-mounting can be shortened accordingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen flare in an automatic dust remover for removing dirt or foreign matter contained in a water stream during the flow of the waste water.
Relates to a method for manufacturing a glass.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a conventional automatic dust remover.
A portion of the frame 1 is shown by a side cross section. The automatic dust remover shows a state where the screen frame 1 is placed in the water stream of the wastewater, and ws on the upper surface of the bottom surface C of the wastewater channel shows the water surface of the wastewater stream.

A screw shaft 2C provided in the screw casing 2 is axially supported by a bearing 2b and a bearing in a gear box 2B, and a motor 2A is a gear train in the gear box 2B. The screw shaft 2C is driven via the arm 2D, and the arm 2D is fixed to the screw shaft 2C and both rotate around the screw shaft 2C. The side plate 1A of the screen frame 1 is screwed to the disc 2a fixed to the screw casing 2, and the screen plate 1D of the screen frame 1 is For the sake of convenience of explanation, the axial intervals are roughly arranged, but the actual axial intervals Bp in each screen plate 1D are constant at 2.5 mm to 50 mm.

These screen plates 1D and arms 2D
FIG. 4 shows an enlarged explanatory view of the portion a in FIG. 3 in order to show the relationship between and. As shown in FIG. 4, the rake plate 2g screwed to the arm 2D is welded with the claws 2d arranged in the axial direction of the screen plates 1D.
The welded claws 2d and the rake plate 2g form a "rake". Further, as shown in FIG. 3, this rake is fixedly mounted on the arm 2D over the entire axial length within the screen frame 1.

As can be understood from FIG. 3 and FIG. 5 showing the cross section of FIG. 3, the side plates 1A and 1B are welded to a plurality of screen fixing bars-1C provided therebetween. Each screen plate 1D is provided in a state in which the open portions of the C-shaped arc cut are opened upward, and the outer periphery of the screen plate 1D is
The screen fixing bars -1C are welded to each other in the axially stacked state in which the axial pitches are equal intervals of Bp, and the welding is performed at the positions 1a and 1b in FIG. It is what Further, the inner diameter portion 1c of the side plate 1B is open toward the flow b of the dirty water.

As shown in FIG. 5, an apron 2f is fixed to the front side of the arm 2D which turns in the direction of arrow d. Screw casing 2 screen frame
The upper portion of the exposed portion of the frame 1 is opened, and the hopper-2e is fixed to the opened portion.

In the conventional automatic dust remover as described above,
The operation is as follows. When sewage flows from the opening 1c of the screen frame 1 as shown by the arrow b, the sewage or foreign matter contained in the water causes the screen plates forming the screen. The water, which has been received by 1D and has its foreign matter removed, flows out downstream as indicated by arrow c.

As a result, these foreign substances are accumulated inside the screen frame 1, but the power of the motor 2A is driven by the gear box 2B.
The screw shaft 2C is rotated through the arm 2
The claw 2d and the apron 2f forming the rake are also swung in the direction of arrow d via D. By the turning of the claw 2d, the accumulated foreign matter is scraped up, and when the claw 2d swivels above the hopper-2e, it is scraped up on the front surface of the apron 2f, and the accumulated foreign matter is gravitated. It is collected in the bottom 2h of the hopper-2e, that is, in the screw casing 2.

In this case, the action of each claw 2d swiveling in the axial clearance of each screen plate 1D has the effect that the foreign matter stuck between the screen plates 1D is raked. It is to scrape up and clean in a scratched state.
The turning speed of the arm 2D is a gentle speed of several revolutions per minute.

The foreign matter collected in the screw casing 2 in this way is shown in FIG. 3 by the rotation of the screw-2c.
Is conveyed toward the shoot 2F side. In this case, the pitch p of the screw-2c is gradually narrowed toward the shoe 2F side. Therefore, the conveyed foreign matter is compressed as the pitch p is narrowed, and the water squeezed out by the compression is discharged from the drain pipe 2i, and is dehydrated and then compressed. The foreign matter is naturally dropped from the shoot 2F into a container (not shown) provided in the lower portion to be collected.

[0011]

In the screen frame 1 of the automatic dust remover which operates as described above, the shape of each screen plate 1D is as shown in the above description. As shown in FIG. 5, the shape is not a completely closed circle but a C shape with an open upper part. Further, each screen fixing bar-1C supporting each of the screen plates 1D has its outer peripheral portion forming the C-shape except for the above-mentioned C-shaped open area. Exists in.

That is, those screen fixing bars-1C
5 are not evenly distributed in the circumferential direction in FIG. 5, but rather are arranged unevenly downward. Further, as described above, when the plurality of screen plates 1D are welded in the axial direction of each screen fixing bar-1C as described above, the welding causes the screen fixing bars to be welded. Has the property of becoming shorter. For this reason, each screen fixing bar-1C according to the designed size is used to
When the frame 1 is manufactured, a phenomenon as shown in FIG. 6 below occurs.

FIG. 6 shows the screen frame in FIG.
FIG. 1 is an enlarged view of only the frame 1, and the screen plate 1D is a simplified view showing the arrangement of only solid lines. Further, the illustration exaggerates the deformation caused by the welding. Each screen play
1D is welded to the screen fixing bars-1C, and when the screen fixing bars-1C are shortened by the welding, as described above, the screen fixing bars-1C are slightly unevenly distributed downward and Since each screen plate 1D has a shape that is opened upward, the axis of the screen frame 1 as a whole is deformed below the originally intended axis c, It becomes a distorted axial center like ce.

In this state, the side plate 1A
When the side plate 1A is screwed to the disc 2a by fitting the fitting hole 1d in the shoulder 2j of the disc 2a to the original shaft center c of the screw shaft 2C, the screw after completion of welding is finished. −
The axis ce of the frame 1 does not match.

This causes the following problems. FIG. 7 shows the thus distorted axial center ce.
FIG. 3 shows the relationship between the claw 2d and the screen plate 1D when the screen frame 1 as it is is fitted and screwed to the disc 2a. It corresponds to an enlarged view. That is, since the axis ce of the screen frame 1 is distorted with respect to each claw 2d which is swung around the axis c by the screw shaft 2C, the screen plate 1D is distorted. Will have a relative arrangement as shown in the figure. As is clear from the state shown in the figure, the claw 2d and the screen plate 1D are in contact with each other, or they cannot be assembled with each other.

For this reason, conventionally, the above-mentioned axis c
The liner was fixed between the side plate 1A and the disc 2a so that the center axis ce coincides with the axis ce, and the two are screwed together to complete the automatic dust remover. However, it takes several days to screw the screen frame 1 to the screw casing 2 while correcting the liner having the two axial centers c and ce by trial and error. It was amazing. It is an object of the present invention to provide a method for manufacturing a screen frame in an automatic dust remover, which can omit the correction work at the time of assembling the screen frame.

[0017]

The automatic dust remover to which the present invention is directed has the following configuration. Each of the plurality of C-shaped ring-shaped screen plates has its C-shaped arc center aligned with a lateral axial line that intersects the vertical direction, and the open ends of the C-shaped arc cut upward. And the layers are fixed to each other with a certain gap in the axial direction. In order to fix the stacked layers, the screen planes are respectively attached to a plurality of screen fixing bars provided in the axial direction at the circumferentially divided positions of the outer circumference of the C-shaped arc. Are welded together to form a screen frame.

One side plate and the other side plate are welded to both ends in the axial direction of the screen fixing bars, and a circular opening portion sharing the center of the C-shaped arc in the one side plate is used for the flow of sewage. It is open toward you. A rake is screwed to an arm that is located inside the screen plates and that revolves around the center of the arc, and the rake is mounted on the rake plate. Each pawl that swirls between the gaps in the axial direction of the plate is welded.

At the axial position sharing the axis of the swivel, foreign matter is pressure-fed to the inner diameter of the screen frame so as to pass from the one side plate to the other side plate. In addition, a screw casing provided with a screw shaft for rotating the pawl is fixed. Above the portion of the screw casing exposed in the screen frame, the foreign matter scooped by the swivel of the pawl when it was positioned above it in the course of the swivel. The hopper is configured to be opened so that the hopper can be dropped and collected into the screw casing.

The manufacturing process of the screen frame in such an automatic dust remover is as follows. (1) The shaft center of the one side plate is set to a position slightly above the shaft center of the other side plate, and a line connecting the shaft centers is set as a temporary shaft center, and (2) In a state in which the temporary axis coincides with the center of the C-shaped arc of the screen plate and corresponds to the position where the outer peripheries of all the screen plates are in contact, in the circumferential direction thereof. Positioning each screen fixing bar in each of the divided and distributed axial directions and welding both ends of each screen fixing bar to the one side plate and the other side plate,

(3) After the welding, the screen fixing bars are welded to the outer periphery of the screen plate in such a state that a constant gap is formed in the axial direction to form a screen frame. The axial lengths of all of the screen fixing bars before welding, which have been completed, are reduced by the welding, and (4) the above-mentioned after completion of the screen frame is completed. The shaft center of the other side plate and the screw
It consists of a step of screwing the end plate of the other side plate in close contact with the disc fixed vertically to the screw casing at a position where it coincides with the axis of the casing. .

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The automatic dust remover of the present invention has the same structure as the automatic dust remover shown in FIGS. However, among the automatic dust removers shown in FIGS. 3 to 5, the method for manufacturing the screen frame 1 is different from the conventional method. Therefore, with respect to the structure and operation of the automatic dust remover in FIGS. 3 to 5, the parts already described in detail will be omitted to avoid duplication of description.

FIG. 1 shows a screen frame which can be placed in FIG.
FIG. 3 is a side sectional view showing a state in which the frame 1 is not yet welded to the screen plate 1D. That is, FIG. 1 shows a method for manufacturing the screen frame 1. In this case, one side plate 1F, the opening hole 1Fa, the other side plate 1E, the fitting hole 1Ea, and the screen fixing bar-1 are placed.
Each of G is a side plate 1B, an opening hole 1c, a side plate 1A, a fitting hole 1d (FIG. 6) and a screen in FIG.
This corresponds to the fixed port-1C.

A screen described later in the configuration of FIG.
After completing the welding of the plate 1D, the shape and dimensions of the side plate 1F on one side, the opening hole 1Fa, the side plate 1E on the other side, and the screen fixing bar-1G are deformed by the welding, as described later. Are side plates 1B, opening holes 1c, side plates 1A and screen fixing bars in FIG. 3, respectively.
It is the same as the design size of 1C.

In FIG. 1, the fitting hole 1 in the side plate 1E
The axial center ci of the opening hole 1Fa of the side plate 1F with respect to the axial center c of Ea is set such that the dimension s of 0.2 to 0.5% of the axial distance Ls is biased upward, and both side plates thereof are set. A plurality of screen fixing bars-1G are provided between the axial directions of 1F and 1E.
Are provided and both ends of each screen fixing bar-1G are welded to the side plate 1E and the side plate 1F, respectively, to form the configuration of FIG.

In this case, the positions of the screen fixing bars-1G are as follows. FIG. 2 shows a roll cross section of FIG. In addition, the screen shown by the phantom line of two-dot broken line in FIGS.
The plate 1D is to be welded later as described later.

In a state in which the arc center of the screen plate 1D shown by a virtual line after virtual welding and the virtual axis center i are aligned with each other, the screen plate 1D is shown.
At each position divided in the outer peripheral direction, the screen fixing bars -1G are arranged in parallel with the virtual axis i. In this case, the imaginary axis center i is the axis center c of the fitting hole 1Ea and the axis center ci of the opening hole 1Fa.
It is a line that connects with.

In the structure shown in FIGS. 1 and 2, the imaginary line is drawn at each point e of each screen fixing bar-1G while leaving a gap of pitch ps in the direction of the virtual axis i. As shown, each screen plate 1D is welded to each screen fixing bar-1G. In this case, the thickness and pitch ps of the screen plate 1D are shown larger than the actual size for convenience of explanation.

In the configuration shown in FIGS. 1 and 2, each screen plate 1D has all of the screen plates 1D as shown by the phantom lines. -Welding to each of these points e in the plate 1D, the screen frame 1 of Fig. 1 is completed.
In this case, the welding is performed at a large number of points in the axial direction of each screen fixing bar-1G, so that the screen fixing bar-1G is reduced in size by the welding.

At these welding points, as shown in FIG. 2, each screen fixing bar-1G is unevenly distributed downward due to the opening of the screen plate 1D. There is. As a result, the reduction due to the welding is caused in the direction of arrow g in FIG. 1 due to the fact that the screen plate 1D is opened upward, and the relative size after deformation due to the welding is caused. The position of the side plate 1F with respect to the right side plate 1E is the position of 1F shown by the phantom line. That is, the axial center of the opening hole 1Fa of the side plate 1F (shown in phantom in FIG. 1) after being deformed by the welding coincides with the axial center c of the fitting hole 1Ea in the side plate 1E within the allowable value.

Further, the fact that the shaft center of the opening hole 1Fa after the welding is deformed so as to coincide with the shaft center c of the fitting hole 1Ea is
After the deformation, the virtual axis line i coincides with the axis center c. This also means that after the deformation, each screen fixing bar-1G is also parallel to the shaft center c, and the shaft centers of the respective screen plates 1D after welding are also the shaft centers. will match c.

Each screen fixing bar before the above welding
The length of 1 G is set to be 0.3 to 0.8% longer than the axial dimension Ls in consideration of the reduction due to the welding. As a result, the dimension Lsr between the side plate 1E and the side plate 1F, which has been reduced in size by the above welding, is within the allowable value of the design dimension. Here, as shown in FIG. 3, since the pitch Bp of each screen plate 1D is different depending on the model, the screen plate 1D is welded to the screen fixing bar-1G. The number of sheets also differs depending on the model. The range of the value of 0.3 to 0.8% is such a screen.
This takes into account the difference in the number of welded plates of Plate 1D.

With respect to the screen frame having a design dimension within the allowable value after welding, the axis of the fitting hole 1Ea is aligned with the axis of the screw casing 2. In this state, if the side plate 1E is brought into close contact with the disc 2a and screwed, the axis of the entire screen plate 1D coincides with the axis of the screw casing 2.

In this case, as a method of aligning the axis of the fitting hole 1Ea with the axis of the screw casing 2, a method of fitting the fitting hole 1Ea to the shoulder 2j of the disc 2a is adopted. However, other than the usual screw
Positioning with a knock pin for aligning the axis of the casing 2 with the axis of the fitting hole 1Ea may be used.

After screwing, the rake 2 of the rake is attached to the arm 2D.
After attaching d, the arm 2D is attached to the screw shaft 2C to complete the automatic dust remover. Here, the state in which the screen frame 1 is screwed to the screw casing 2 after the completion of welding in FIG. 1 is the same as that of all the screen plates 1D as described above. The shaft center and the shaft center of the screw shaft 2C are in alignment with each other. The claw 2d is swung by the screw shaft 2C as described above.

This means that each claw 2d can be moved without any deviation of the axial center.
Is capable of turning around the axis of the screw shaft 2C, and the turning makes it possible for any of the claws 2d to come into contact with the screen plate 1D shown in FIG. It means not to be. In addition, in FIG.
In the prior art example, the apron 2f is provided in front of the direction of travel of the rake, but the nail 2d is also screened.
The apron is not absolutely necessary because it is for scraping up the foreign substances deposited in the inner plate 1D.

[0037]

As described above, in the assembly of the screen frame 1 by welding, the virtual axis i slightly deviated from the true axis c is taken into consideration in consideration of the distortion caused by the welding in advance. By arranging one side plate 1E, the other side plate 1F and each screen fixing bar-1G at the center and adopting a manufacturing process of welding each screen plate 1D, after the completion of the welding, The screwing of the screen frame 1 and the screw casing 2 can be completed by a simple work of simply screwing the shafts 1 and 2 with their axial centers aligned. This does not require a correction work of using a liner for aligning the axis of the screw attachment as in the conventional case, and the time required for the screw attachment can be shortened by about 3 days.

[Brief description of drawings]

FIG. 1 shows a manufacturing process of a screen frame 1 in an automatic dust remover according to the present invention.

FIG. 2 is a cross-sectional view of a roll surface in FIG.

FIG. 3 is a side sectional view showing a conventional automatic dust remover.

FIG. 4 is an enlarged view of portion a in FIG.

5 shows a cross section taken along line II in FIG.

FIG. 6 is an explanatory view of a conventional manufacturing method of the screen frame 1.

7 is a diagram showing a case where the screen frame 1 as manufactured by the method of FIG. 6 is assembled as it is in the state of FIG.
It is an enlarged explanatory view of the h part in FIG.

[Explanation of symbols]

1 screen frame, 1E, 1F side plate, 1
Ea fitting hole, 1Fa opening hole, 1G screen fixing bar, 1D screen plate, 2 screw casing, 2C screw shaft, 2D
Arm, 2G rake, 2a disc, 2c screw, 2d claw, 2e hopper.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tokuji Taneda 3-6-18 Shibaura, Minato-ku, Tokyo Inside Nishihara Institute of Environmental Health

Claims (1)

[Claims] 1. A plurality of C-shaped ring-shaped screen plates.
The C-shaped arc center is aligned with the transverse axial axis that intersects the vertical direction, and the open portions of the C-shaped arc that are cut are directed upward and at a constant interval in the axial direction. Since it is fixed by stacking with a gap,
The screen frames are formed by welding the screen plates to a plurality of screen fixing bars provided in the axial direction at respective positions divided in the circumferential direction of the outer circumference of the arc. One side plate and the other side plate are welded to both ends in the axial direction of the screen fixing bars, and a circular opening sharing the center of the C-shaped arc in the one side plate is used for the flow of waste water. Open towards them and screen screen
A rake is screwed to an arm that is located inside the inner diameter of the table and revolves around the arc center as an axis, and the rake is formed on the rake plate by the above-mentioned screens of the screen plates. The claws that swivel between the gaps in the axial direction are welded to each other, and at the axial position that shares the axial center of the swivel, from the one side plate of the screen frame. A screw provided with a screw shaft that pumps foreign matter into the inner diameter and causes the pawl to swivel while passing through the other side plate.
.The pawl is located above the exposed portion of the screw casing in the screen frame in the course of its turning. At the time of manufacturing the automatic dust remover, the hopper for opening the hopper for dropping the foreign matter scooped by the turning into the screw casing and collecting the foreign matter is opened. In the manufacturing process, the shaft center of the one side plate is set to a position slightly higher than the shaft center of the other side plate, and the temporary shaft center connecting both shaft centers is the entire screen. The screens are respectively distributed in the circumferentially divided axial directions corresponding to the positions where they coincide with the circular arc centers of the plates and correspond to the outer circumferences of all the screen plates. Position the fixing bar and attach each of the screws. Both ends of the burner fixing bar are welded to the one side plate and the other side plate, and after the welding, the screen fixing bars are provided with a constant gap in the axial direction along the outer periphery of the screen plate. By welding to complete the screen frame, and the screen fixing bar
The axial lengths of all of these before welding are reduced by the welding, and the axial center of the other side plate and the screw after the completion of the screen frame.
.The process of screwing the end plate of the other side plate in close contact with the disc fixed vertically to the screw casing at a position that coincides with the axis of the casing Screen frame manufacturing method for automatic dust remover.