JP2000355423A - Air separator for pneumatically conveyed slurry-like object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air separator in a conveyance end part of a large diameter conveyance pipe effectively separating air with a small device and capable of reducing a discharge speed to a state close to a free fall state when discharging conveyance objects such as reclaiming materials from a tip of a tremie pipe. SOLUTION: This device is provided with a branched introducing passage 13 bisecting an end part of a pneumatic conveyance pipe 1 into right and left at a front face side of a twin cyclone barrel and communicating right and left cyclone cylinder parts 10a and 10b so that they mutually face opposite tangent directions, an exhaust tube 14 hanging from an upper face center of a cyclone barrel 11 to its interior and opening an upper end to the atmosphere, a flow down cylinder 16 integrally communicated with a lower end center of the cyclone barrel 11, a reverse flow passage 21 communicated with the flow down cylinder 16 at a lower end side and hanging its upper end side from the upper face of the cyclone barrel 11 to the interior, and a flow down speed adjuster 20 provided inside the flow down cylinder 16. An end part of the pneumatic conveyance pipe 1 wherein slurry-like conveyance objects such as gravel which include air portions and are separated into a multiplicity of lump-like plugs flow is communicated with the branched introducing passage 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transporting a muddy material such as a landfill material obtained by adding and mixing a solidifying material such as cement milk to dredged soil and the like by pneumatic feeding. TECHNICAL FIELD The present invention relates to an air separation device for pneumatically conveying a muddy conveyed material that separates it from a conveyed material.

[0002]

2. Description of the Related Art Generally, when dredged soil is used as a landfill material, a solidified material (stabilizing agent) such as cement milk is added to the soil and mixed in order to increase the strength of the ground after landfill. You are using

In order to transport such a landfill material, a pneumatic feeding method has been studied. In this method, the transported material is divided into a number of massive plugs with air in between and transported in a transport pipe. In the transport end portion, a cyclone is used, and the transported material and the transport air are separated by centrifugation.

[0004]

However, when the above-mentioned landfill material is cast on the water bottom, it is necessary to install a cyclone at the upper end of a submerged casting pipe such as a tremy pipe, and the diameter of the cyclone is 500 to 1000 mm. When a large-diameter transport pipe is used, the required cyclone becomes large, and it is too large to be installed at the upper end of the submerged casting pipe and hung above the water surface, which has been a problem that it is not practical. .

The present invention has been made in view of such conventional problems,
Even when a large amount of conveyed material such as muddy landfill material is transported using a large-diameter transport pipe, air can be effectively separated with a small device at the end of the transport, and the landfill material etc. It is an object of the present invention to provide an air separation device for a pneumatically fed muddy conveyed material that can reduce the discharge speed to a state close to a free fall state when discharging the conveyed material from the tip of the tremee tube.

[0006]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
A double-barreled cyclone cylinder having a hollow peanut-shaped cross-section in which a part of the two left and right cyclone cylinder parts are integrated with each other in an overlapped state, and having an exhaust port on the upper surface, and a pneumatic pumping type on the front side of the cyclone cylinder The end of the transfer pipe is divided into two parts, left and right, a branch introduction path that is communicated in the opposite tangential direction to the left and right cyclone cylinders, and is drooped down from the center of the upper surface of the cyclone barrel, An exhaust pipe having an upper end open to the atmosphere, a falling pipe integrally connected to the center of the lower end of the cyclone cylinder, a lower end communicating with the lowering cylinder, and an upper end hanging down from the upper surface of the cyclone cylinder to open; A reverse flow path, and a flow velocity adjuster provided in the flow-down cylinder, and in the branch introduction path, a muddy conveyed material such as earth and sand is divided into a number of massive plugs with an air portion interposed therebetween. Flowing pneumatic conveying pipe In air separation unit air pressure Okudoro shaped transport composed as to communicate the terminal end.

The exhaust port is constituted by an exhaust pipe hanging down from the upper surface of the cyclone cylinder to the inside of the cyclone cylinder. The upper end side of the reverse flow path is inserted concentrically into the exhaust cylinder so as to hang down. It is preferable that a plurality of flow mitigation ridges be provided vertically on the inner peripheral surface of the cylindrical portion.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 to FIG. 4 show an embodiment of the present invention. In this example, a muddy conveyed material a composed of an underwater landfill material obtained by adding and mixing cement milk to dredged soil is transferred to a conveying pipe 1.
Through the upper surface of the water bottom casting pipe 4 suspended on the crane 3 of the work boat 2.

An air separation device 5 according to the present invention is fixed to the upper end of the water bottom casting pipe 4, and the terminal end of the transport pipe 1 is connected to this. The air separation device 5 has two cyclone cylinder portions 10a and 10b on the left and right. The two cyclone cylinder portions 10a and 10b are integrated in a state where a part thereof is overlapped with each other, and the inside is formed in a peanut shape. It has a twin-body type cyclone cylinder 11 having one cavity in cross section, and the upper surface thereof is a top plate 12.
Has been closed by.

A branch introduction path 13 is provided on the upper front side of the cyclone cylinder 11. The branch introduction path 13 divides the flow from the transfer pipe 1 into two parts, a transfer pipe connecting part 13a to which the end of the transfer pipe 1 is connected on the front side of the cyclone cylinder 11, and the left and right cyclone cylinders 10a, It is composed of branch paths 13b, 13b communicating with the 10b part in tangential directions opposite to each other.

The top plate 12 of the cyclone cylinder 11 penetrates through the center of both cyclone cylinders 10a and 10b, and an exhaust cylinder 14 is suspended in the cyclone cylinder 11, and the exhaust cylinder 1
The upper end of 4 is an exhaust port 15.

At the center of the lower end of the cyclone cylinder 11, a falling cylinder 1 is provided.
A number of blades 18 are fixed radially with respect to a rotating shaft 17 in a flow-down cylinder 16, and are rotated at a constant speed by a motor 19, so that the internal flow velocity is reduced. Is provided with a downflow speed adjuster 20 for regulating the flow rate.

The lower end of a pair of front and rear reverse flow paths 21 and 21 is formed in a communication opening on a peripheral wall of the flow-down cylinder 16 above the flow-down speed regulator 20. The two reverse flow paths 21 and 21 extend upward along the front and rear sides of the cyclone cylinder 11, merge with each other at the upper part of the cyclone cylinder 11, face the tip side of the merging cylinder 22 downward, and are concentrically arranged in the exhaust cylinder 14. And is opened in the bottom of the cyclone cylinder 11.

On the inner peripheral surface of each of the cyclone cylinders 10a and 10b, a plurality of ridges 2 for reducing flow in the vertical direction are provided.
Are integrally provided.

The air separation device 5 configured as described above includes:
In the transport pipe, the transport air and the transported article a which are divided into a number of massive plugs with the air portion interposed therebetween and pneumatically fed,
The two cyclone cylinders 10 pass through the branch paths 13b, 13b.
a, 10b.

The conveying air and the conveyed object a are swirled along the back wall of both cyclone cylinders 10a and 10b, and the ridges 23 are formed.
Colliding with each other at the center of the cyclone barrel where both walls meet while being reduced in energy. Although the moving speed of the colliding transported material and the air is reduced by the impact of each other, the centrifugal separation is repeated along the wall surface by the residual energy. At this time, the conveyed material is separated into the outer peripheral portion and the air is separated inward by the specific gravity difference, so that only the air is discharged to the outside (atmosphere) of the cyclone cylinder 11 from the bottom opening of the exhaust pipe 14 located at the central portion. As this phenomenon continues, the falling velocity of the conveyed article a is reduced, and the conveyed article a is pushed downward simultaneously with the decrease in the pressure inside the cyclone cylinder.

However, if the falling speed of the conveyed article a cannot be sufficiently attained, the part of the conveyed article a is
1 and reverses gravity to further attenuate the velocity, and the falling velocity becomes a free fall state.

FIGS. 5 to 7 show another embodiment of the present invention, in which the same parts as those of the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.

In this example, each of the cyclone tube portions 10a, 10
b, from the center of each top toward the inside,
14 is inserted, and the reverse flow path 2 is inserted in the center of one of the exhaust pipes.
The 1,21 merging cylinder 22 is inserted.

The flow speed adjusting device 20 uses a weight 25 or a damper 26 urged in a closing direction by a spring, temporarily stores the conveyed material thereabove, and stores the conveyed material. It uses a structure that rotates in the opening direction depending on the weight.
Alternatively, the flow-down speed can be adjusted by adjusting the biasing force of the spring.

[0022]

As described above, the air separating device for pneumatically fed muddy conveyed material according to the present invention has a hollow peanut cross section in which a part of two right and left cyclone cylinders are integrated in a state of being overlapped with each other. None, a double-body type cyclone cylinder having an exhaust port on the upper surface, and the end of the pneumatic conveying pipe at the front side of the cyclone cylinder is bisected to the left and right, and opposite to the left and right cyclone cylinders. A branch introduction path communicated in a tangential direction, an exhaust pipe hanging down from the center of the upper surface of the cyclone body to the inside thereof, and an upper end open to the atmosphere; and a flow-down pipe integrally connected to the center of the lower end of the cyclone body. A reverse flow path having a lower end communicated with the downflow cylinder, and an upper end side hanging down from the upper surface of the cyclone cylinder to be opened, and a downflow speed adjuster provided in the downflow cylinder; On the road,
The muddy conveyed material such as earth and sand is divided into a large number of plugs across the air portion, and by communicating the end of the pneumatic conveying tube that flows, the energy is reduced by the collision between the conveyed materials. However, if the momentum after the deenergization is greater than the flowover speed by the downflow speed adjuster, the flow reverses against the gravity in the reverse flow path, so that a sufficient deenergizing action is performed, and the shape is smaller than that of the conventional cyclone. I can do it.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an embodiment in which a muddy conveyed material is cast on the bottom of a water using the apparatus of the present invention.

FIG. 2 is a plan view of an example of the device of the present invention.

FIG. 3 is a longitudinal sectional view of the same.

FIG. 4 is a rear view of the same.

FIG. 5 is a plan view of another example of the device of the present invention.

FIG. 6 is a front view of the same.

FIG. 7 is a side view of the same.

[Explanation of symbols]

 a Conveyed object 1 Conveyance pipe 2 Work boat 3 Crane 4 Submerged casting pipe 5 Air separation device 10a, 10b Cyclone cylinder part 11 Double body type cyclone cylinder 12 Top plate 13a Conveyance pipe connection part 13b Branch path 13 Branch introduction path 14 Exhaust pipe DESCRIPTION OF SYMBOLS 15 Exhaust port 16 Flow-down cylinder 17 Rotating shaft 18 Blade 19 Motor 20 Flow-down speed adjuster 21 Reverse flow pipe 22 Merging cylinder section 23 Protrusion 25 Weight 26 Damper

Claims (3)

[Claims] 1. A hollow peanut-shaped cross section in which a part of two right and left cyclone cylinder parts are integrated so as to be overlapped with each other.
A double-body cyclone cylinder having an exhaust port on the upper surface, and a terminal end portion of a pneumatic conveying pipe at the front side of the cyclone cylinder is divided into right and left parts, and tangential directions opposite to each other with respect to the left and right cyclone cylinder parts. A branch introduction path, which is communicated toward, and an exhaust pipe which is suspended from the center of the upper surface of the cyclone cylinder to the inside thereof and whose upper end is open to the atmosphere, and a flow-down cylinder which is integrally connected to the center of the lower end of the cyclone cylinder, The lower end side is communicated with the downflow cylinder, a reverse flow path in which the upper end side is suspended from the upper surface of the cyclone body and opened, and a downflow speed adjuster provided in the downflow cylinder, and the branch introduction path is provided. The air separation of the pneumatically transported muddy conveyed material, in which the muddy conveyed material such as earth and sand is divided into a large number of plugs across the air portion and communicates with the end of the pneumatically conveyed conveying pipe that flows. apparatus. 2. The exhaust port comprises an exhaust pipe which is suspended from the upper surface of the cyclone cylinder inside the cyclone cylinder, and the upper end of the reverse flow path is inserted concentrically into the exhaust cylinder and is suspended therefrom. 2. The air separation device for pneumatically fed muddy conveyed products according to 1. 3. The air separation device for pneumatically fed muddy conveyed products according to claim 1, wherein a plurality of ridges for reducing flow are provided vertically on an inner peripheral surface of each cyclone cylinder portion.