JPH01148317A - Drum type classifier - Google Patents

Abstract

PURPOSE:To promote the solid-liquid separation in a precipitation drum and at the same time, to improve the washing effect for solid by dropping down the raw material from a raw material introducing pipe to the precipitation drum through a small drum, and agitating the raw material with agitation plates in the small drum. CONSTITUTION:The muddy water contg. the excavated soil sent from an excavator is introduced in the drum type classifier 2 through a raw material introducing pipe 25, and allowed to collide against the plate type collision body 29 and then dropped down in a small drum 32. As the small drum 32 is integrally rotated with the precipitation drum 18 and soil, sand and muddy water are agitated by agitating blades 34, sand for aggregation and fine sand are suitably separated and then dropped in the muddy water in the precipitation drum 18 through an opening 33. Consequently, the particles of large diameter and small diameter are considerably separated in the small drum 32, and the agitation of muddy water in the precipitation drum 18 is reduced, so that washing and precipitation of soil are promoted and the recovery rate is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drum classifier that performs solid-liquid separation using a rotating drum.

(Prior art) Mud water is introduced into a rotating drum, solids in the mud are settled, and a spiral plate provided on the inner surface of the sedimentation drum is used to
A drum component am is known which corrects solid-liquid separation by collecting solids at one end of the settling drum and taking them out, and causing the liquid after removing the solids to overflow from the other end of the settling drum.

This drum component A81 uses a spiral blade to gather large particles that have settled faster due to the difference in sedimentation speed due to the difference in specific gravity between large particles and small particles such as mud and take them out from the drainage hole, while removing small particles from the drainage hole. It also has a washing function that drains any overflowing liquid.

(Problems to be Solved by the Invention) However, the known drum-type classification (sometimes) has the following problems.

First, the liquid inside the settling drum is violently agitated by the raw materials put into the settling drum, which inhibits the settling of the solids, causing the solids to overflow out of the settling drum along with the liquid, and the solid-liquid separation function is disabled. There was a problem with reducing it.

Also, since there are practical restrictions on the size of the settling drum,
A large amount of small particles adhered to large particles were discharged from the discharge hole, which caused dissatisfaction with the washing function.

The purpose of the present invention is to improve the solid-liquid separation function by promoting sedimentation by preventing agitation of the liquid in the sedimentation drum as much as possible, and to improve the washing function by promoting the separation of large-diameter particles and small-diameter particles. Our objective is to provide a type classifier.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a raw material introduction pipe inserted into the sedimentation drum from a drainage hole, and a raw material introduction pipe arranged on the axis of the discharge port of the raw material introduction pipe. a small drum that surrounds the impactor and is provided to rotate integrally with the sedimentation drum; an opening formed by opening the end of the small drum on the side of the discharge hole; The drum is configured to include a stirring plate provided on the inner surface of the drum.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, a drum-type classifier used for the purpose of removing excavated soil from muddy water in a muddy water treatment system using the shield construction method is illustrated. However, the uses of the drum classifier of the present invention are not limited to this.

First, the outline of the muddy water treatment system using the shield method will be explained with reference to FIG.

In the shield method, muddy water mixed with bentonite is injected onto the face of the excavator to prevent the face from collapsing. A muddy water treatment system removes excavated soil from muddy water discharged from an excavator, adjusts the specific gravity of the muddy water, and reuses the muddy water.

Mud water (raw material) mixed with excavated soil is carried out from the excavation advance a1 and fed into the drum classifier 2. In the drum classifier 2, earth and sand are separated into muddy water, and the earth and sand is sent to a dewatering conveyor 3 which also serves as a cleaning agent, and the muddy water is sent to a settling tank 4.

The earth and sand conveyed through the hydrophilic conveyor 3 are removed by a cleaning jaw 5 to remove particles with small particle diameters, and are compacted and hydrophilized by being vibrated by a vibrator 6, and then taken out. Earth and sand with large particle sizes (large particles), excluding fine particles (small particles), are recovered as aggregate for concrete.

Hereinafter, the soil excluding this fine grain will be referred to as aggregate soil.

- The water flows into the settling tank 4 along with the washing water flowing down the slope of the dewatering conveyor 3.

The muddy water from the drum type classification 8!2 and the dewatering conveyor 3 has settled.
It flows into tank 4, where it settles.

The supernatant water of the sedimentation tank 4 flows into the specific gravity adjustment tank 7.

The specific gravity adjustment tank 7 adjusts the specific gravity of the muddy water by adding the muddy water created by the mud making WJ8. The muddy water after specific gravity adjustment is fed to the excavator 1 by the circulation pump 9 and reused.

The fine sand settled in the settling tank 4 contains earth and sand with large particle sizes. Therefore, the recovery rate of aggregate-use earth and sand is improved by re-separating the earth and sand from this fine sand as follows.

The excavation If 111 repeatedly excavates and stops, such as stopping after digging to a certain extent and preparing for further excavation. When the excavation 1f11 is stopped, muddy water containing excavated soil is not introduced into the drum classifier 2. Therefore, when the excavation 8!1 is stopped, the fine particles settled in the sedimentation tank 4 are re-injected into the drum classifier 2 to re-separate the aggregate soil and fine sand, and the fine aggregate in the sedimentation tank 4 is re-injected into the drum classifier 2. Reduce the mixing rate of soil and sand. After this re-separation treatment, the grains are sucked in by a sand pump 11 suspended in the running lane 10, fed to a dehydrator 12, and taken out after the dehydration treatment. The selection of the feeding light, whether to send the fine particles in the sedimentation tank 4 to the drum classifier 2 for re-separation, or to send the fine particles after re-separation to the dehydrator 12 for dehydration, is made using the switching valve 13.1.
It can be switched by 4.

Next, the structure of the drum component a will be explained with reference to FIGS. 1 and 2.

The drum classifier 2 of this embodiment is installed on a frame 15 placed in the settling tank 4. The frame 15 is provided with a rail 1G for the lane 10 on which the vehicle runs. As described above, the sand pump 11 is suspended from the lane 10 in which the vehicle runs.

A support roller 17 is rotatably mounted on the frame 15,
A sedimentation drum 18 is rotatably mounted on this support roller 17. A belt 19 is wound around the sedimentation drum 18, and is rotated via the belt 19 by a motor (g and r) not shown.

A drain hole 20 is provided on one end surface of the sedimentation drum 18 for the purpose of introducing raw materials.
is provided, and a discharge hole 21 is provided on the other end surface.

This discharge hole 21 is formed to have a smaller diameter than the liquid discharge hole 20.

On the inner surface of the sedimentation drum 18, there is a drainage hole 2 from the liquid drainage hole 20 side.
A spiral blade 22 having a direction of transfer is provided on one side, and a plurality of lifting plates 23 are provided radially at the end on the drain hole 20 side. A conical chute 24 is disposed in the discharge hole 21 with its tip facing outward, and partition plates 24a are provided radially on the conical chute 24.

A raw material introduction t25 is inserted into the sedimentation drum 18 from the drain hole 20. The tip of this raw material introduction Ig 25 is supported by a first arm 27 extending from the inner wall of the sedimentation drum 18 via a bearing 28 . 1jS1 arm 2
A plate-shaped collision body 29 is attached to 7 via a bracket 28. This collision body 29 is a raw material introduction W 25
The discharge port 30 is disposed on the axis of the discharge port 30 .

Further, a second arm 31 extends from the inner wall of the sedimentation drum 18 closer to the discharge hole 21 than the first arm 26, and a Pt
A small drum 32 is attached between the arm 26 of fJl and the arm 31 of @2.

This small drum 32 is provided so as to surround the collision body 29, and has an opening 33 formed by opening the end on the side of the discharge hole 21. Stirring plates 3 are arranged radially on the inner surface of the small drum 32.
4 is provided.

The drum classifier configured as described above operates as follows.

Mud water (raw material) containing excavated soil fed from the excavation 8!1 is introduced into the drum type classifier 8+12 via the material introduction pipe 25. The raw material discharged from the discharge port 30 of the raw water introduction pipe 25 collides with the collision body 32 and then falls into the small drum 32. The small drum 32 rotates integrally with the sedimentation drum 18, and the soil and mud are stirred by a stirring plate 34, and the soil for aggregate and fine sand are separated. It falls into the muddy water of the drum 18.

The force of the raw material is reduced from the raw material introduction pipe 25 through the small drum 32, and then it falls into the muddy water in the sedimentation drum 18. Therefore, stirring of the muddy water in the sedimentation drum 2m 18 is reduced, and as a result, sedimentation of the earth and sand is promoted, the amount of earth and sand that overflows from the drain hole 20 together with the muddy water is reduced, and the recovery rate of the earth and sand is improved.

In addition, the raw material collides with the colliding body 29 and is dispersed, and is further stirred by the stirring plate 34 of the small drum 32 to separate large-diameter particles and small-diameter particles as they fall into the muddy water in the sedimentation drum 18. , washing is promoted.

(Effects of the Invention) According to the present invention, the raw material falls into the muddy water in the settling drum while its momentum is reduced from the raw material introduction pipe through the small drum, so that the stirring of the muddy water in the settling drum is reduced. As a result, settling of sediment is promoted and solids recovery rate is improved.

In addition, the raw material collides with the colliding body and disperses, and is further stirred by the stirring plate of the small drum to separate large and small particles, which are then dropped into the muddy water in the sedimentation drum, facilitating washing. be done.

[Brief explanation of the drawing]

Figure m1 is a longitudinal sectional view of one embodiment of the present invention. Figure Pt52 is its front view. Figure f53 is a sectional view taken along line A-A of the PjSi diagram. FIG. 4 is a schematic diagram of a system in which the embodiment of FIG. 1 is installed. 2 Nidrum type classification B! 4: Sedimentation tank 10: Running lane 11: Sand pump 18: Sedimentation drum 20: Drainage hole 21: Discharge hole 22: Spiral blade 2
3: Lifting plate 24: Conical chute 25: Raw material introduction pipe 26: First arm 27: Bearing 28: Bracket 7) 29: Collider 30: Discharge port 31
:Second arm 32:Small drum 33:Opening 34:Agitation plate agent Patent attorney Tsuji Sanbe (name of power bow) Figure 2

Claims (1)

[Scope of Claims] A settling drum rotatably provided, a drainage hole for introducing raw materials provided on one end surface of the settling drum, and a discharge hole provided on the other end surface of the settling drum, A spiral blade provided on the inner surface of the sedimentation drum so that the transfer direction is from the liquid drainage hole side to the waste material discharge hole side, a lifting plate provided at the end of the inner surface of the sedimentation drum on the waste material hole side, and a material discharge hole. A drum classifier consists of a conical chute placed in the drum, a raw material inlet pipe inserted into the sedimentation drum from a drainage hole, and a colliding body placed on the axis of the discharge port of the raw material inlet pipe. a small drum that surrounds the collision body and is provided to rotate integrally with the sedimentation drum; an opening formed by opening the end of the small drum on the side of the discharge hole; and an opening provided on the inner surface of the small drum. A drum-type classifier characterized in that it is equipped with a stirring plate.