JPH0640661Y2 - Berth screen - Google Patents

Description

[Detailed description of the device]

[0001]

FIELD OF THE INVENTION The present invention relates to a bar screen.

[0002]

2. Description of the Related Art A large amount of seawater or river water is taken in power plants, LNG bases, water purification plants, etc. At that time, since dust in water interferes with these facilities, it is necessary to remove dust. A dust remover is provided in the intake channel.

A typical dust remover of this type is shown in FIG.
The bar screen shown in Fig. 1 is widely known, and a pair of left and right carrier chains 02 are endlessly laid between a foot sprocket (not shown) provided underwater and a head sprocket 06 provided above the water surface. A plurality of raked buckets 01 are attached to 02 at equal intervals, and the carrier chain 02 is circularly rotated by the drive of the head sprocket 06, so that the raked buckets 01
As they climb along bar rack 03,
The dust trapped on No. 3 is removed by combing it with a rake 01a protruding from the bucket 01.

In this type of bar screen, the dust-containing water flows through the bar rack 03, and a large number of buckets ascend along the bar rack. Although a dehydration hole is formed on the front and rear surfaces of the bucket 01, it has a large water resistance against the flow of the intake channel. Therefore, in order to reduce the water resistance, by arranging one bucket for every four links of the carrier chain as shown in FIG. 3 and increasing the bucket interval, the water resistance of the bar screen based on the bucket is increased. Is reduced.

However, there is a problem that the dust removing capability of the bar screen is reduced due to the decrease in the number of buckets attached in order to increase the bucket interval. Further, when the bucket is turned over by the head sprocket 06, dust particles falling from the bucket are shot 04.
Before falling into the dust trough 05 after passing through, it falls from the clearance between the adjacent buckets and reduces the dust removing effect. Therefore, the present applicant previously proposed a dust drop prevention means 07 as shown in FIG. 3 in Japanese Utility Model Publication No. 61-24575, but if such means is provided, the equipment cost and the maintenance cost are correspondingly increased. There is also the problem of increase.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and an object thereof is to provide an economical bar screen having a large dust removal capacity and a reduced equipment cost.

[0007]

The first gist of the present invention is as follows.
Attach a plurality of buckets at equal intervals to an endless chain that is wound around a head sprocket above the water surface of the intake channel and a foot sprocket immersed in the intake channel, and raise these buckets along the bar rack to raise the intake channel. In a bar screen adapted to scrape away dust inside, a lead plate immediately before lead is a narrow and long plate, a face plate immediately after lead is a wide and long plate, and at least a front portion of a bottom plate is a forward tilted plate, and each is formed. It is characterized by comprising a gutter-shaped bucket having a cross section of 4 to 5 sides, and a comb plate projecting obliquely upward and rearward at the upper end of the lead plate immediately after the lead and having a tip penetrating with the bar rack. The bar girder is a bar screen, and the second gist is that the plate immediately after the lead is provided with a plurality of vertically elongated holes that are bored at equal intervals in the lateral direction and that extend over substantially the entire height of the plate immediately after the lead. A bar screen which is characterized.

[0008]

According to the present invention, the bucket has a trapezoidal streamline shape with a short side in the vertical vertical plane and a front side in the vertical plane. Water resistance is drastically reduced when a slit is formed in the face plate immediately after lead.

Further, when the bucket is turned around the head sprocket, the comb plate reaches a close distance to the bottom plate of the preceding bucket, so that the clearance between the preceding bucket and the succeeding bucket is substantially eliminated. The dust scraped up by the bucket does not drop from this clearance, and all dust in the bucket is collected in the dust trough along the outer surface of the bottom plate of the preceding bucket during reversal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall side view thereof, and FIG. 2 is a perspective view showing the bucket of FIG.

The major difference of the present invention from that shown in FIG. 3 lies in the bucket shape and structure. That is, in the figure, reference numeral 1 denotes a bucket, which is a front plate 1-1 made of a laterally long plate having a relatively narrow width, and a long hole 1-2 made of a laterally long plate having a relatively wide width and extending in the vertical direction. Is a vertical plate immediately after the lead 1-3 which is provided at equal intervals in the left-right direction, the front half is inclined forward and slopes forward, the front end is continuous with the lower edge of the front plate 1-1, and the second half is horizontal. A long bottom plate 1-4 which extends and whose rear edge is continuous with the lower edge of the rear plate 1-3;
-1, a bottom plate 1-4 and a rear plate 1-3, and a pair of left and right pentagonal end plates 1-5 closing the left and right ends of the gutter-shaped member, and a stay plate 1 arranged at appropriate intervals in the lateral direction. -6 and a comb plate 1 in which the front edge is continuous with the upper edge of the rear plate 1-3 and extends obliquely upward and rearward to form a plurality of combs penetrating the bar rack 3 at the rear end.
-7. Here, the width of the comb plate 1-7 is made almost equal to the width of the end plate, and the bucket 1 is fixed to the link of the carrier chain 2 through the end plate 1-5 for every two links. Has been done.

According to the bucket 1 as described above, the cross section of the gutter portion thereof is close to the trapezoidal streamline as shown in FIG. 1 with respect to the flow of the flowing water channel. Pressure loss is reduced compared to a bucket with a square cross section. In particular, when a slit-shaped long hole 1-2 is formed in the rear plate 1-3, the dust-containing water that has flowed into the bucket 1 from the front flows out through the long hole 1-2 to the rear. In this case, the flow-through resistance is significantly reduced.

Next, when the bucket 1 is turned over by the head sprocket 6, the comb plate 1 has a short bucket interval.
As shown in FIG. 1, the tip of -7 is the bottom plate 1 of the preceding bucket.
Since the distance is close to -4, the clearance between the two becomes very small. Therefore, at the time of reversal, dust in the bucket does not drop into the intake channel from between the bucket and the preceding bucket, and as shown in the figure, all dust falls into the dust trough 5 along the outer surface of the bottom plate of the preceding bucket.

[0014]

EFFECTS OF THE INVENTION According to the present invention, since the bucket has a shape with less water resistance against water flow,
Since many buckets can be attached to the carrier chain, the dust removal capacity of the bar screen is greatly improved, and the fall prevention means that was conventionally attached to the head sprocket is not required, so the facility cost can be reduced. can get.

[Brief description of drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

FIG. 2 is a perspective view showing the bucket of FIG.

FIG. 3 is a side view of a main part of a conventional bar screen.

[Explanation of symbols]

1: Bucket, 1-1: Front plate, 1-2: Long hole, 1-
3: rear plate, 1-4: bottom plate, 1-5: end plate, 1-6: stay plate, 1-7: comb plate, 2: carrier chain, 3: bar rack, 4: fixed chute, 5: dust Trough, 6-head sprocket, 7: foot sprocket, 8: dust.

Claims (2)

[Scope of utility model registration request] 1. A plurality of buckets are attached at equal intervals to an endless chain that is wound around a head sprocket above the water surface of an intake channel and a foot sprocket immersed in the intake channel, and these buckets are bar racked. In a bar screen that is designed to scrape up dust in the intake channel by ascending along the path, the face plate immediately before lead is a narrow and long plate, the face plate immediately after lead is a wide and long plate, and at least the front part of the bottom plate is at the front. A gutter-shaped bucket each formed of a tilted plate and having a quadrilateral to five-sided cross-section, and a comb plate projecting obliquely upward and rearward at the upper end of the lead plate immediately after the lead and having a tip penetrating with the bar rack. Bar screen characterized by having. 2. The vertical lead plate is provided with a plurality of vertical slots extending laterally at equal intervals and extending over substantially the entire height of the vertical lead plate. Bar screen.