JP2790939B2 - Screen residue dewatering transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering apparatus in which a screen residue scraped and removed from a water channel of a sewage treatment plant, a pumping station or the like is squeezed and dewatered, and a pipe-shaped conveying pipe is connected downstream of the squeezed dehydration. The present invention relates to a screen residue dewatering / conveying device that absorbs swelling even when a compressed dewatered screen residue swells and restores in a transport pipe, and enables smooth transportation.

[0002]

2. Description of the Related Art As a device for dehydrating and conveying screen residue collected from a sewage treatment plant or the like, those described in Japanese Patent Publication No. 57-43049 and Japanese Patent Application Laid-Open No. 1-111718 are known. All of these devices dewater and convey by extruding the screen residue from the bottom of the pipe with an ascending gradient upward, and perform most or all of the dehydration and conveyance of the screen residue in the piping. This has the advantage that the odor of the screen residue does not leak to the surrounding environment and that the screen residue does not come into the eyes of a worker or the like.

[0003]

However, in these prior arts, in any of the examples, the transport path is a tube having the same diameter. Of course, Japanese Unexamined Patent Publication (Kokai) No. 1-111718 discloses a stepped tube. Even in the case of a stepped tube, a predetermined length in each step has the same diameter. The dewatering action of the screen residue is performed by the pressing force applied to the screen residue, and the pressing force of the screen residue is caused by the movement resistance of the screen residue in the tube. Due to the pressurization, the internal pressure of the screen residue increases, water is released and discharged to the outside, whereby the screen residue is dehydrated. However, the screen residue is a mixture of food waste, toilet paper, human hair, fiber, human droppings, etc., its properties are not constant, the frictional resistance between the inner walls of the transport cylinder differs greatly, and its fluidity also changes . Therefore, the conventional method of dewatering with a straight pipe or a stepped pipe cannot make the resistance against the change of the screen residue constant, so that there is a disadvantage that the screen residue is clogged in the transport tube.

[0004] In order to prevent this, it is conceivable that the conveying pipe is tapered so that its base end is thinner and its tip is thicker. However, the screen residue depressurized and dehydrated by the cooperative action of the piston and the back pressure plate is pushed into the transport pipe in a block shape each time the piston reciprocates, and then tries to expand again in the transport pipe. In addition, the degree of expansion is unlikely to expand and deform in the width direction of the slit between the back pressure plate and the transport pipe from the state at the time of pressurized dehydration, but a large pressing force acts on the screen residue. It is easy to deform. For this reason, if the conveying pipe is formed in a tapered shape with the same ratio in the width and gap direction of the slit toward the front end, a large gap is generated between the conveying screen residue and the slit in the width direction of the slit in the conveying pipe. The screen residue pieces peeled off from the dehydrated screen residue fall into this excess space and become stagnant, which causes the columnar screen residue to buckle in the transport tube, increasing transport resistance and making transport impossible. May fall.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screen residue dewatering / conveying apparatus capable of performing stable conveyance by changing the taper angle of the conveying tube in accordance with the expansion direction of the dewatered screen residue in the conveying tube. I do.

[0006]

Means for Solving the Problems In order to achieve the above object, a screen residue dewatering / conveying apparatus of the present invention depressurizes and dehydrates a screen residue collected from a sewer or the like and presses the screen residue between a back pressure plate and a conveying pipe. In the screen residue dewatering transport device that extrudes from the formed slit toward the transport pipe and transports the inside of the transport pipe, the transport pipe has a rectangular cross-sectional shape,
It is characterized in that it is formed in a tapered shape that gradually expands toward the front end, and the taper angle in the gap direction of the slit of the transport pipe is set to be larger than the taper angle in the width direction.

[0007]

In the dewatering / conveying device for screen residue, the screen residue collected from the sewer is dewatered under pressure, and is extruded toward the conveying tube through a slit formed between the back pressure plate and the conveying tube. The pressurization is released in the transport tube, and that the transport resistance of the screen residue in the transport tube increases due to expansion, the transport tube is formed in a tapered shape having a rectangular cross-sectional shape and gradually expanding toward the tip, By setting the taper angle in the gap direction of the slit of the transfer pipe (in the direction in which the expansion is large due to a large pressing force acting on the screen residue) to be greater than the taper angle in the width direction, the expansion ratio of the screen residue and the transfer are improved. The magnifying power of the pipe is harmonized with the pipe, whereby the transport resistance of the screen residue in the transport pipe is reduced, and the transport of the screen residue can be performed smoothly.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a dewatering / conveying apparatus for screen residue according to the present invention. In the figure, reference numeral 1 denotes a hopper of a screen residue dewatering / conveying device, which is supplied with screen residue collected and recovered from a water channel of a sewage treatment plant, a pumping station or the like continuously or intermittently. Supply to The hopper 1 protrudes from the upper part of the pressure dehydrator 2 and is
Is provided with a hydraulic cylinder 3 (or screw) for squeezing and dewatering the screen residue supplied from the hopper 1. The hydraulic cylinder 3 is supported by a cylinder bracket 3a provided in the dehydrator, and has a piston 3b at a rod end of the cylinder 3. The piston 3b advances and retreats in the dehydrator by operating the cylinder, and the hopper 1
The screen residue supplied from is depressed intermittently by pressing.

Therefore, a large number of slit-shaped or small-shaped drain holes are formed in the lower peripheral surface of the cylindrical dehydrating device 2 corresponding to the lower position of the hopper 1, and the dehydration downstream of the hopper 1 is performed. A drain screen 4 is provided on the lower surface side of the device 2 as necessary. A cylindrical back pressure portion B is connected to the downstream end of the pressurizing and pressing portion A of the cylindrical dehydrating device provided with the hydraulic cylinder 3 so that the front end of the cylindrical depressing device B has a tubular shape. The transport section C having a tapered shape is connected.

An opening is provided in a part of the cylindrical tube 5 which constitutes the back pressure part B and is connected to the dewatering device 2 or the drain screen 4, and the back pressure plate 6 is fitted into the opening and swung. A back pressure hydraulic cylinder 8 is provided via a bracket 7 projecting from the back pressure plate 6 while being freely supported, and the back pressure plate 6 is advanced into the cylinder by operating the cylinder 8 in accordance with the pressing force. The screen residue pressed by the piston 3b into the pipe 5 is subjected to pressure dehydration by applying a required back pressure,
Further, this back pressure can be adjusted by the cylinder 8.

The transport section C is mainly composed of a transport pipe 9 having a rectangular cross section and formed in a tapered shape which gradually expands toward the tip. The transport pipe 9 is inclined as shown in the figure. Will be arranged.

Further, in order to transport the dewatered screen residue more smoothly, a low-friction material, for example, a high-density polyethylene thin film may be adhered to the inner surface of the transport pipe 9 or a fluororesin processing may be performed.

In this case, as shown in FIGS. 1 and 2, the conveying pipe 9 has a rectangular cross section and is formed in a tapered shape which gradually expands toward the front end. A large pressing force acts on the screen residue due to the gap C direction of the slit S of B, that is, the piston 3b and the back pressure plate 6, and accordingly, the taper angle θ1 in the direction of large expansion.
Is set to be larger than the taper angle θ2 in the width W direction.

As described above, a large pressing force acts on the screen residue by the piston 3 b and the back pressure plate 6, and the dewatered screen residue passes through the slit S of the back pressure portion B and then expands according to the difference in the degree of expansion. By setting the taper angle θ1 in the gap C direction of the slit S of the transfer pipe 9 to be larger than the taper angle θ2 in the width W direction, the expansion rate of the screen residue and the enlargement rate of the transfer pipe 9 are coordinated, and the transfer is performed. The transport resistance of the screen residue in the pipe 9 can be reduced, and the transport of the screen residue can be performed smoothly. Note that the angle of the taper angle can be set according to the length, the inclination angle, and the like of the transport pipe 9. Usually, the taper angle θ1 in the gap C direction of the slit S is set to 0.8 to 2.0 degrees. , And the taper angle θ2 in the width W direction of the slit S is 0.5 to 1.0 degree,
To be set in the range.

In the dewatering / conveying apparatus for screen residue, the screen residue put into the hopper 1 is pressed and squeezed by the reciprocating motion of the piston 3b and the pressing of the back pressure plate 6. , And the screen residue is subjected to a desired dehydration, and is extruded into the transport pipe 9 through the slit S formed between the back pressure plate 6 and the transport pipe 9.

The screen residue thus extruded has a columnar shape having a width W and a cross-sectional shape of a slit S having a gap C. The screen residue is pressurized and dehydrated by the resistance generated by the slit S formed between the back pressure plate 6 and the conveyance tube 9, the frictional force with the conveyance tube 9, and the resistance due to the weight of the screen residue. At this time, the rotational force (pressing force) of the back pressure plate 6 is adjusted so as not to generate an excessive pressing force, so that the resistance force is kept constant.

The screen residue extruded from the slit S has a columnar shape with a cross section of the slit S having a width W and a gap C, but expands after passing through the slit S. Depending on the degree of this expansion, the gap C between the slits S of the transport pipe 9
By setting the taper angle θ1 in the direction to be larger than the taper angle θ2 in the width W direction, the expansion ratio of the screen residue and the enlargement ratio of the transfer tube 9 are harmonized, and the transfer resistance of the screen residue in the transfer tube 9 is reduced. As a result, the screen residue can be smoothly transported.

[0018]

According to the screen residue dewatering / conveying apparatus of the present invention, the conveying pipe is formed in a tapered shape having a rectangular cross section and gradually expanding toward the front end, and the gap direction of the slit of the conveying pipe ( A large pressing force acts on the screen residue,
Along with this, by setting the taper angle in the direction of larger expansion) larger than the taper angle in the width direction, the expansion ratio of the screen residue and the enlargement ratio of the transport tube are harmonized, and thus, the screen residue in the transport tube is adjusted. , The screen residue can be smoothly transferred, and the dewatered screen residue can be stably transferred without being clogged in the transfer pipe.

[Brief description of the drawings]

FIG. 1 is a front vertical sectional view of a screen residue dewatering / conveying apparatus of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory diagram showing a relationship between a transport pipe and a back pressure plate.

FIG. 4 is a horizontal sectional view of the same plane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 2 Pressure dehydration apparatus 6 Back pressure plate 9 Conveyance pipe S Slit C Gap between slits W Width θ1 Taper angle in the gap direction of the slit θ2 Taper angle in the width direction of the slit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-238199 (JP, A) JP-A-5-139504 (JP, A) JP-A-1-117118 (JP, A) JP-A-3- 234397 (JP, A) JP-A-3-268896 (JP, A) JP-A-55-43693 (JP, U) JP-A-62-65403 (JP, U) JP-B-57-43049 (JP, B2) (58) Field surveyed (Int.Cl. ⁶ , DB name) B65F 5/00 B65G 65/44 C02F 11/12 B65F 1/10 B30B 9/04-9/06

Claims (1)

(57) [Claims] 1. A screen residue collected from a sewage channel or the like is dehydrated under pressure, extruded toward a transport tube through a slit formed between a back pressure plate and a transport tube, and transported through the transport tube. In the dewatering / conveying device, the conveying tube (9) is formed in a tapered shape having a rectangular cross section and gradually expanding toward the tip, and a gap (C) direction of a slit (S) of the conveying tube (9). Wherein the taper angle (θ1) is set to be larger than the taper angle (θ2) in the width (W) direction.