JP2010094582A - Sand classifying-conveying-dehydrating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand classifying-conveying-dehydrating device capable of continuously providing classified sand to a dehydration process, which significantly improves a working efficiency and decreases a space for installing the device. <P>SOLUTION: This is a device for recovering sand from a material including water and sand, comprising: a classifier 100 for transferring the sand contained in the material from upstream to downstream; a dehydrator 300 for removing the water contained in the sand; and a conveyor 200 for delivering the sand from the classifier to the dehydrator, wherein the classifier, the conveyor and the dehydrator are integrally connected in sequence from upstream to downstream. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sand classifying and conveying dewatering device capable of continuously recovering dewatered sand from an object to be treated consisting of a mixture of water and sand.

Conventionally, as an apparatus for transferring only sand in a certain direction from a mixture of water and sand, for example, a classifier as described in Patent Document 1 below is known.
However, since the classifier disclosed in Patent Document 1 has a large resistance to water when the spiral blade is rotated, the water surface in the sedimentation tank largely fluctuates with the rotation of the blade, and sand is removed from the sedimentation tank. There was a problem that the contained water overflowed and the sand recovery efficiency was lowered.
Although this problem is slightly improved by lowering the rotational speed of the spiral blade, there is a problem that the processing efficiency is greatly reduced when the rotational speed is lowered.

  Further, in the classifier disclosed in Patent Document 1, since the spiral blade is formed in a ribbon shape, most of the sand diffused in the water by the rotation of the spiral blade passes downstream through the center hole of the spiral blade. This has been a major factor in reducing the sand recovery efficiency.

On the other hand, Patent Document 2 described below describes a carry-out device such as sand settling composed of a screw conveyor in which drain holes are provided in screw blades.
However, according to the device disclosed in Patent Document 2, since water can be released only from a small drain hole, the resistance of water during screw rotation cannot be greatly reduced.
Therefore, even if the screw disclosed in Patent Document 2 is applied to the classifier disclosed in Patent Document 1, the problem of overflow from the sedimentation tank is not solved due to the large resistance of water, The problem of reduced processing efficiency cannot be solved.

In view of the above situation, the present applicant has proposed a new spiral screw classifier in Japanese Patent Application No. 2008-58590.
The spiral screw classifier proposed by the applicant of the present application is an excellent apparatus in that it can solve the problems of the conventional classifier as described above.

By the way, since the sand after being classified by the classifier contains a large amount of water, it needs to be dehydrated.
However, since the conventional classifier including the apparatus proposed by the applicant of the present application needs to remove the classified sand from the classifier once and transfer it to a separate dewatering apparatus for dewatering treatment, the work efficiency Was very bad. Moreover, in order to install a classifier, a dehydrator, and a transport device that transports sand from the classifier to the dehydrator, a very large installation space is required.

Japanese Utility Model Publication No. 4-17236 Japanese Utility Model Publication No. 60-63460

  The present invention has been made to solve the above-described problems, and the sand after classification can be continuously subjected to dehydration as it is, and the working efficiency can be greatly improved. It is intended to provide a sand classification transport and dehydration apparatus that can significantly reduce the space required for the installation of the sand.

  The invention according to claim 1 is an apparatus for recovering sand from an object to be processed comprising a mixture of water and sand, and transfers the sand from the object to be processed from the upstream side to the downstream side. A classifying unit, a dehydrating unit for removing moisture contained in the sand, and a transporting unit for transporting sand transferred from the classifying unit to the dewatering unit, the classifying unit, the transporting unit, and the dewatering unit And a sand classifying and conveying dewatering device characterized in that they are integrally connected in this order from the upstream side to the downstream side.

  According to a second aspect of the present invention, the classification unit includes a storage tank in which the workpiece is stored, and a rotatable center disposed in the storage tank along the length direction of the storage tank. And a screw blade spirally provided along an outer peripheral surface of the central shaft, and the screw blade is provided so as to form a space between the outer peripheral surface of the central shaft and the screw blade. A center hole and a plurality of small holes formed on a surface that is smaller in diameter than the center hole and in contact with the object to be processed; and on the outer peripheral surface of the center axis in the length direction of the center axis 2. A sand classification transport dewatering apparatus according to claim 1, wherein a perforated plate is provided at a predetermined interval along the central axis and perpendicular to the central axis.

  According to a third aspect of the present invention, the pitch of the perforated plate is larger than the pitch of the screw blades, and the diameter of the perforated plate is equal to or smaller than the diameter of the central hole. It is related with the sand classification conveyance dehydration device of Claim 2 characterized by the above-mentioned.

  According to a fourth aspect of the present invention, a support member comprising a plurality of radially extending arms is provided on the outer peripheral surface of the central axis, and the support members are provided at a predetermined interval along the length direction of the central axis. The plurality of arm tip portions of each support member are connected by a ring-shaped member, and the ring-shaped members are connected by a plurality of connecting members extending along the length direction of the central axis. In addition to being connected, the connecting member also connects adjacent blades of the screw blades, and the perforated plate is disposed across the plurality of radially extending arms. It is related with the sand classification conveyance dehydration apparatus of Claim 2 or 3 characterized by these.

  According to a fifth aspect of the present invention, the transport unit includes a transport tank having a bottom surface continuous with the storage tank of the classification unit, and a rotation that is disposed in the transport tank and transports sand in a downstream direction by a rotating operation. And the bottom surface of the transport tank is inclined downward toward the downstream direction, the rotating body includes a rotary shaft disposed in a direction perpendicular to the transport direction of the workpiece, and the rotation The sand classification conveyance dehydration apparatus according to any one of claims 1 to 4, further comprising a plurality of stirring blades disposed around the shaft.

  In the invention according to claim 6, the stirring blade extends around the rotation shaft in a direction substantially parallel to the rotation shaft, and a space is formed between the rotation shaft and the stirring blade. It is related with the sand classification conveyance dehydration apparatus of Claim 5 characterized by the above-mentioned.

  The invention according to claim 7 is the sand according to claim 6, wherein the stirring blade has a shape substantially conforming to the shape of the bottom surface of the transfer tank in a direction substantially parallel to the rotation axis. The present invention relates to a classification transport dehydrator.

  The invention according to claim 8 has a plurality of support members extending radially about the rotation shaft, and a blade mounting frame fixed to the tip of the support member, and the stirring blade is the blade mounting frame. 8. The sand according to claim 7, wherein the blade mounting frames adjacent to each other in the circumferential direction centering on the rotation axis are connected to each other by a strip-like plate curved in an arc shape. The present invention relates to a classification transport dehydrator.

  According to a ninth aspect of the present invention, the dewatering unit is attached to a rotating shaft extending in the same direction as the conveying direction and a tip of an arm extending radially about the rotating shaft, and the rotating shaft rotates. And a plurality of buckets that scoop up the sand that has been transported from the transport unit, and a dewatering mechanism that removes moisture from the sand that has been scooped up in the plurality of buckets. A draining net provided above the bottom of the tank for cutting the water of the scooped sand, a drain tank attached to the bucket, passing through the draining net and receiving the water stored in the bucket bottom, and the drain tank The sand classification conveyance dehydration apparatus according to any one of claims 5 to 8, further comprising a suction device that sucks the inside to create a negative pressure.

  According to the invention which concerns on Claim 1, it has been transferred from the classification part which transfers sand from the upstream to the downstream from the to-be-processed object, the dehydration part which removes the moisture contained in sand, and the classification part A transport unit that transports sand to the dewatering unit is integrally connected in this order from the upstream side to the downstream side, so that the processing steps from classification to dewatering can be continuously performed by one apparatus. Therefore, the processing efficiency can be remarkably improved as compared with the conventional case. In addition, since the classification device, the transport device, and the dehydration device that have been installed separately can be installed as a single device, the space required for installation can be greatly reduced.

According to the second aspect of the present invention, the center hole provided so that the screw blade forms a space between the large number of small holes formed on the surface in contact with the workpiece and the outer peripheral surface of the center shaft. Therefore, when the screw blade is rotated, water can escape from both the small hole and the center hole, so that the resistance of water can be greatly reduced. Therefore, the fluctuation of the water surface in the storage tank can be suppressed to be small, and the water containing sand can be prevented from overflowing from the storage tank, and the sand recovery efficiency can be greatly improved.
In addition, since the resistance of water is small, the rotational speed of the screw can be increased or the outer diameter of the blade can be increased, and the processing efficiency can be greatly improved.
Furthermore, by providing a perforated plate at predetermined intervals along the length direction of the central axis on the outer peripheral surface of the central axis, sand contained in water that escapes downstream through the central hole is present. It can be captured by the hole plate and transported upstream again, and the sand recovery efficiency can be improved. In addition to being able to escape through the holes in the perforated plate, water can also escape through the gap formed between the spiral screw blade and the perforated plate perpendicular to the central axis. Therefore, the resistance of water hardly increases by providing a perforated plate. That is, it is possible to further improve the sand collection efficiency while keeping the resistance of water low.

According to the invention which concerns on Claim 3, the flow of the water which passes along the center hole of a screw blade | wing is suppressed by a perforated plate because the arrangement | positioning pitch of a perforated plate is large compared with the arrangement | positioning pitch of a screw blade | wing. It is possible to improve sand recovery efficiency while minimizing the phenomenon.
In addition, since the diameter of the perforated plate is equal to or smaller than the diameter of the center hole of the screw blade, the perforated plate can be provided without dividing the screw, and the transfer of sand by the screw is due to the presence of the perforated plate. There is no hindrance.

  According to the invention of claim 4, the screw blade can be reliably fixed to the rotating shaft via the fixing means including the arm, the ring-shaped member, and the connecting member, and the same fixing means can be used. Since the perforated plate is fixed, there is no need to separately provide a member for attaching the perforated plate, and an increase in water resistance due to the provision of the perforated plate can be minimized. Further, since the perforated plate is disposed across the arms, the perforated plate can be securely and firmly fixed.

According to the invention which concerns on Claim 5, the bottom face of a conveyance tank inclines downward toward the downstream direction, and is provided with the some stirring blade which conveys sand to a downstream direction by rotation operation in a conveyance tank. By having a rotating body, the action of gravity and the stirring action of the stirring blades can be made to work together on the sand transferred from the classification part, and the sand is efficiently and reliably dehydrated. It becomes possible to convey to a part.
In addition, since the rotating body includes a rotation shaft disposed in a direction perpendicular to the conveyance direction of the workpiece and a plurality of stirring blades disposed around the rotation shaft, the rotation direction of the stirring blade is It becomes perpendicular to the rotation direction of the rotation axis of the classification part. Therefore, it is possible to obtain a smooth flow without synchronizing the rotating shaft of the rotating body and the rotating shaft of the classification unit, it is possible to improve the sand transport efficiency, and to reduce the space of the transport unit, It is possible to reduce the size of the entire apparatus.

According to the invention of claim 6, since the stirring blade is extended in a direction substantially parallel to the rotation shaft around the rotation shaft, the flow transferred from the classification portion is extended by the extension of the stirring blade. It can be received in the direction (length direction) plane and further sent to the downstream side, and excellent transport efficiency can be obtained.
In addition, since a space is formed between the rotating shaft and the stirring blade, water can escape through the space when the rotating body rotates, the resistance of the water can be kept very small, and only sand can be efficiently used. It becomes possible to convey to a dehydration part.

  According to the seventh aspect of the invention, the stirring blade has a shape that substantially conforms to the shape of the bottom surface of the transport tank in a direction substantially parallel to the rotation axis. Propulsive force generated by rotation can be efficiently applied to the sand deposited on the bottom surface, and the sand can be conveyed very efficiently.

  According to the eighth aspect of the present invention, the stirring blades are fixed to the blade mounting frame, and the blade mounting frames adjacent in the circumferential direction around the rotation axis are mutually connected by the strip-shaped plate curved in an arc shape. Since they are connected, it is possible to prevent the stirring blades from shaking due to the resistance of water or centrifugal force during rotation. Therefore, the rotating body can be rotated at high speed, and the conveyance efficiency can be improved.

  According to the ninth aspect of the present invention, in the dewatering unit, the water contained in the sand that has been scooped up by the bucket can be removed in two stages of a draining net and a suction device, so that the dewatering process can be performed efficiently in a short time Can be performed.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a sand classification transport dehydrating apparatus according to the invention will be described with reference to the drawings.
FIG. 1 is a plan view of a sand classification transport dewatering apparatus according to the present invention, FIG. 2 is a front view of the sand classification transport dehydration apparatus according to the present invention, and FIG. 3 is a right side view of the sand classification transport dehydration apparatus according to the present invention. 4 is an AA arrow view of FIG. 1, FIG. 5 is a BB arrow view of FIG. 1, FIG. 6A is a CC arrow view of FIG. 1, and FIG. FIG. In FIG. 6B, the tank is omitted.

  An apparatus according to the present invention is an apparatus for dewatering and recovering sand from an object to be processed consisting of a mixture of water and sand, and from the object to be processed from the upstream side to the downstream side. A classifying unit (100) to be transferred, a dehydrating unit (300) for removing water contained in the sand, and a transport unit (200) for transporting sand transferred from the classifying unit (100) to the dehydrating unit (300). It consists of and.

The classification unit (100), the conveyance unit (200), and the dehydration unit (300) are integrally connected in this order from the upstream side to the downstream side in the flow direction of the workpiece.
That is, the classification unit (100), the conveyance unit (200), and the dehydration unit (300) integrally form one apparatus, and the object to be processed is transferred from the classification unit (100) to the conveyance unit (200). It is possible to continuously flow to the dehydrating part (300) via the above.

First, the configuration of the classification unit (100) will be described.
The classification unit (100) includes a storage tank (1) in which an object to be processed made of a mixture of water and sand is stored, and a spiral screw disposed in the storage tank (1).
The spiral screw includes a rotatable central shaft (2) disposed along the length direction of the storage tank (1), and screw blades provided spirally along the outer peripheral surface of the central shaft (2). 3).

The storage tank (1) is a tank having a rectangular shape in plan view, the bottom surface is horizontally disposed, and the top surface is open.
The front and rear side walls (4) are formed in a tapered shape that gradually expands upward. And the height of the upper end part of a side wall (4) is a little lower than the axial center of a central axis (2) (refer FIG.4 and FIG.5).

The storage tank (1) includes a supply port (5) for supplying the object to be processed into the tank, and a drain port (6) for discharging water separated from the object to be processed outside the tank. ing.
The supply port (5) is provided so as to protrude outward from one of the side walls (4) at a position near one end side in the length direction of the storage tank (1), and opens upward. Yes. And the to-be-processed object supplied from the supply port (5) is supplied to the bottom part vicinity of a storage tank (1) through the opening part provided in the side wall (4) of a storage tank (1).
The drain port (6) is provided on the other end side in the length direction of the storage tank (1), and opens upward at a position lower than the upper end portion of the side wall (4). And the water which overflowed from the part (pool) by which the spiral screw of the storage tank (1) was arrange | positioned is discharged | emitted outside from a drain outlet (6).

The central axis (2) of the spiral screw is connected to a motor (7) disposed on the other end side of the storage tank (1) via known connecting means such as a pulley and a belt, and the motor (7) Rotates with driving.
The motor (7) is an inverter motor, and is configured to be able to change the rotation speed according to the load received by the central shaft (2).
As a result, when the screw blade (3) rotates, the rotation speed can be reduced when the load of received water is large, and the rotation speed can be increased when the load is small, thereby maximizing processing efficiency and recovery efficiency. It becomes.

  The screw blade (3) is rotated from the other end side (downstream side) to the one end side (upstream side) (from the drain port (6) side to the supply port (5) along with the rotation of the central shaft (2). It is formed in a spiral shape so that the sand contained in the object to be processed can be transferred toward the side).

The screw blade (3) is a belt-like plate having a constant width provided spirally along the length direction of the central axis (2), and forms a space between the outer peripheral surface of the central axis (2). Has a central hole (8) provided in (see FIG. 4).
The center hole (8) plays a role of escaping water existing around the center axis (2) to the downstream side when the screw rotates. Since most of the sand contained in the object to be treated has settled in the vicinity of the bottom of the storage tank (1), most of the sand is not contained in the water escaping downstream from the center hole (8).
Therefore, by providing the center hole (8), it is possible to greatly reduce the resistance of water without substantially reducing the sand collection efficiency.
If the diameter of the center hole (8) is too small, the action of escaping water will not be sufficiently exerted, and if it is too large, the sand transfer efficiency will be greatly reduced. Therefore, it is necessary to set it within an appropriate range. It is preferable to set to 50 to 60% of the diameter of 3).

A large number of small holes (9) are formed over the entire surface of the surface of the screw blade (3) that is in contact with the workpiece (a surface that is substantially perpendicular to the central axis (2)) (see FIG. 4).
The small hole (9) plays a role of reducing the resistance of the water by allowing the water contained in the workpiece to be in contact with the screw blade (3) to flow downstream when the screw rotates.
The center hole (8) described above allows water to escape from the vicinity of the central axis containing almost no sand, whereas the small hole (9) allows water to escape from a portion close to the bottom of the storage tank where sand is accumulated. In order to suppress the escape of sand, the diameter is smaller than the central hole (8) (for example, 1/10 to 1/15).
Moreover, since the minute component contained in the workpiece escapes from the small hole (9) together with water, only sand having a predetermined particle diameter or more can be efficiently transferred.

The shape of the small hole (9) is circular in the illustrated example, but may be other shapes such as a triangle or a quadrangle.
The size of the small hole (9) can be appropriately set according to the particle size of the sand to be recovered as a product. For example, when the sand to be collected is fine sand having a particle size of 1.5 mm or less, the diameter is set to 10 mm. In this case, the diameter of the center hole (8) is set to about 1500 mm.

As described above, the screw blade (3) has a large diameter central hole (8) provided around the central axis (2) and a small diameter provided at a position away from the central axis (2). A small hole (9) is formed.
In the present invention, by adopting such a configuration in which two types of holes having different positions and sizes are employed, the conflicting problem of greatly reducing the resistance of water without reducing the sand transfer efficiency is simultaneously achieved. It became possible to solve.

On the back surface side (downstream side) of the screw blade (3), as shown in FIG. 4, ribs (10) extending in the radial direction are projected at regular intervals in the circumferential direction.
These ribs (10) serve to reinforce the screw blades (3), and loosen the lump of sand accumulated on the bottom surface of the storage tank (1) as the screw blades (3) rotate, thereby smoothly transporting them. Demonstrate the effect that
When the rib (10) is provided on the surface side (upstream side) of the screw blade (3), the movement of the sand transferred along the surface of the screw blade is hindered by the rib, but the transfer is hindered by being provided on the back surface side. Only the unraveling action is exhibited and the sand is transported more smoothly.

On the front side in the rotational direction of the rib (10), a non-hole portion (11) not provided with a small hole (9) is provided with a slight width.
Since such a non-hole part (11) is provided, the flow of water passing through the small hole (9) is weakened on the front side in the rotational direction of the rib (10), so that the loosening action by the rib described above is achieved. Unimpeded by water flow.

As shown in FIGS. 1 and 2, the arrangement pitch of the screw blades (3) is the other part (upstream in the transfer direction) in the vicinity of the supply port (5) of the object to be treated (1). It is formed smaller than the downstream side in the transfer direction.
More specifically, the pitch in the vicinity of the supply port is set to ½ or less of the pitch of other portions. Specifically, a pitch of 250 mm can be set near the supply port, and a pitch of 500 mm can be set in other portions.

As described above, the arrangement pitch of the screw blades (3) is smaller in the vicinity of the supply port of the storage tank (1) than the other portions, so that in the workpiece supplied from the supply port. The sand contained in can be efficiently transferred with blades arranged at a narrow pitch, and the resistance of water can be kept small by arranging the blades at a wide pitch in other parts. .
That is, it is possible to simultaneously solve the conflicting problems of improving sand transfer efficiency and reducing water resistance.

A support member (12) comprising a plurality of arms extending radially at right angles to the outer peripheral surface is provided on the outer peripheral surface of the central axis (2). In the present invention, an assembly of a plurality of arms arranged radially is referred to as a support member (12).
A plurality of support members (12) are provided at predetermined intervals along the length direction of the central axis (2). And the front-end | tip part of the several arm in each support member (12) is connected by the ring-shaped member (13) (refer FIG. 5).

The ring-shaped members (13) connecting the arms of the respective support members (12) are connected by a plurality of connecting members (14) extending along the length direction of the central axis (2).
The connecting members (14) connect the ring-shaped members (13) to each other at the tip portions of the respective arms. Therefore, the number of connecting members (14) and the number of arms are the same (12 in the illustrated example). Yes.

The connecting member (14) has the same length as the central axis (2) and is disposed in parallel with the central axis, and simultaneously connects the ring-shaped members (13) to the screw blade ( 3) They are also linked together.
Thereby, screw blade (3) is being fixed to central axis (2) via connecting member (14), ring-shaped member (13), and supporting member (12).

A perforated plate (15) is provided on the outer peripheral surface of the central axis (2) at a predetermined interval along the length direction of the central axis and at a right angle to the central axis.
The perforated plate (15) has an annular shape as a whole, and is disposed across a plurality of radially extending arms as shown in FIG. That is, the perforated plate (15) is attached so as to close the space between the arms.
As a result, the perforated plate (15) is securely and firmly fixed, and is prevented from being damaged by the force received from the workpiece during driving.

  Moreover, in order to attach a perforated plate (15), the perforated plate (15) is fixed using the supporting member (12) for fixing a screw blade | wing (3) to a center axis | shaft (2). It is not necessary to provide a separate member, the number of parts can be reduced, and an increase in water resistance due to the provision of the perforated plate (15) can be minimized.

The shape of the hole of the perforated plate (15) is circular in the illustrated example, but may be other shapes such as a triangle or a quadrangle.
The hole diameter of the perforated plate (15) is set to the same diameter as the small hole (9) formed in the screw blade (3), for example, a diameter of 10 mm.

The perforated plate (15) plays a role of capturing sand contained in the water escaping downstream through the central hole (8) and transferring it to the upstream again by the rotation of the screw blade (3). This makes it possible to greatly improve sand recovery efficiency.
Moreover, since water can escape through the hole of the perforated plate (15), the resistance of water hardly increases by providing the perforated plate (15).
Therefore, it is possible to improve the sand recovery efficiency while keeping the resistance of water low.
Further, the screw blade (3) is inclined with respect to the central axis (2), whereas the perforated plate (15) is disposed at a right angle to the central axis (2). Therefore, a gap is always formed between the center hole (8) and the perforated plate (15), and it is possible to allow water to escape using this gap, and this also allows the perforated plate (15 ) Can suppress an increase in water resistance.

The arrangement pitch of the perforated plate (15) (same as the arrangement pitch of the support member (12)) is set larger than the arrangement pitch of the screw blades (3) as shown in FIGS. ing.
More specifically, the pitch is set to about 5 to 6 times the pitch in the vicinity of the supply port of the screw blade (3) and about 3 to 4 times the pitch in other portions. Specifically, for example, when the pitch in the vicinity of the supply port of the screw blade (3) is 250 mm and the pitch in other parts is 500 mm, the pitch of the perforated plate (15) can be set to 1500 mm.

  Thus, the arrangement pitch of the perforated plate (15) is set to be larger than the arrangement pitch of the screw blade (3), so that it passes through the center hole (8) of the screw blade (3). It is possible to minimize the phenomenon that the water flow is obstructed by the perforated plate (15), and at the same time, it is possible to improve the sand recovery efficiency.

The diameter of the perforated plate (15) is set to be equal to or smaller than the diameter of the central hole (8).
Accordingly, the screw is not divided at the position where the perforated plate (15) is disposed, and the transfer of sand accompanying the rotation of the screw is prevented from being hindered by the perforated plate (15).
In the illustrated example, the diameter of the perforated plate (15) is set smaller than the diameter of the center hole (8) by the width of the ring-shaped member (13).

  As described above, the classifying unit (100) has a plurality of configurations that make it possible to improve the sand recovery efficiency while reducing the resistance of water. These configurations do not act independently, but can act synergistically with the rotation of the screw.

Next, the configuration of the transport unit (200) will be described.
A conveyance part (200) is arrange | positioned in a conveyance tank (21) which has a bottom face continuous with the storage tank (1) of a classification part (100), and a conveyance tank (21), and sand is moved downstream by rotation operation. And a rotating body (22) to be conveyed.

As shown in FIG. 2, the bottom surface of the transport tank (21) is inclined downward toward the downstream direction, and the height of the bottom surface of the transport tank (21) is that of the storage tank (1) of the classification unit (100) at the upstream end. It coincides with the bottom surface, and coincides with the bottom surface of the dewatering tank (31) of the dewatering unit (300) at the downstream end.
The inclination of the bottom surface of the transport tank (21) has a function of sending sand transferred from the classification unit (100) to the dehydration unit (300) using the action of gravity, and will be described later. By acting in cooperation with the action by the blade (24), it becomes possible to convey the sand to the dewatering part (300) very efficiently and reliably.

Hereinafter, based on FIG. 6, the structure of a rotary body (22) is demonstrated.
The rotating body (22) is arranged so as to extend in a direction perpendicular to the conveying direction of the workpiece (the width direction of the conveying tank (21)) and is rotated by driving of a motor (not shown). And a plurality of stirring blades (24) disposed around the rotating shaft (23).
The stirring blade (24) is made of an angle material having an L-shaped cross section and extends around the entire length of the bottom surface width of the transport tank (21) in a direction substantially parallel to the rotation shaft around the rotation shaft (23). It is installed. The plurality of (eight in the illustrated example) support members (25) extending radially about the rotation shaft (23) are respectively attached to the tips of the support members (25) via the blade attachment frames (27).
More specifically, the support member (25) is attached to the center in the length direction of the rotation shaft (23), and the auxiliary support members (26) are attached to both ends in the length direction of the rotation shaft (23). A straight rod-like blade mounting frame (27) is attached so as to connect (25) and the auxiliary support member (26). And the stirring blade | wing (24) is attached so that the length direction of each blade | wing attachment frame (27) may be followed.

The rotating body (22) rotates counterclockwise in FIG. 2, thereby creating a water flow from the upstream side (classifying unit side) to the downstream side (dehydrating unit side) in the vicinity of the bottom surface of the transport tank (21). .
Since the sand transferred from the classification unit (100) settles toward the bottom surface of the transport tank (21) by its own weight, the dewatering unit (300) is efficiently produced by the water flow created near the bottom surface by the rotating body (22). Sent to.
Moreover, as mentioned above, since the bottom face of the transport tank (21) is inclined downward toward the downstream direction, the action of the water flow and the gravity acts in cooperation with each other. Sand is transported very efficiently.

There is a space (28) between the rotating shaft (23) and the stirring blade (24), more specifically, between the rotating shaft (23) and the blade mounting frame (26) to which the stirring blade (24) is attached. Is formed.
By forming such a space (28), water can escape through the space (28) when the rotating body (22) rotates. Therefore, the resistance of water can be kept very small, and only sand can be efficiently conveyed to the dewatering unit (300).

Moreover, the stirring blade (24) has a shape that substantially follows the shape of the bottom surface of the transport tank (21) in a direction substantially parallel to the rotation axis (23).
In the illustrated example, since the bottom surface of the transfer tank (21) is linear in a direction substantially parallel to the rotation axis (23), the shape of the stirring blade (24) in the same direction is also linear. That is, the line (L1) and the line (L2) in FIG. 6 are parallel.
As a result, when the agitating blade (23) is rotated, the propulsive force by the water flow generated by the rotation can be applied evenly and uniformly to the sand settled on the bottom surface of the conveying tank (21), and the sand is conveyed very efficiently. It becomes possible to do.

In the present invention, the shapes of the rotating body (22) and the transport tank (21) are not limited to those described above, and can be, for example, as shown in FIG.
FIG. 7 is a diagram showing an example of a shape change of the rotating body (22) and the transport tank (21), in which (a) corresponds to the CC arrow view of FIG. 1, and (b) is (a). It is an AA arrow directional view.
Also in this modified example, the stirring blade (24) extends in a direction substantially parallel to the rotation axis around the rotation axis (23).
Moreover, the stirring blade (24) has a shape that substantially follows the shape of the bottom surface of the transport tank (21) in a direction substantially parallel to the rotation axis (23).
Specifically, the stirring blade (24) is formed in an arc shape convex in a direction away from the rotation axis (23) in a direction substantially parallel to the rotation axis (23). And the bottom face of the conveyance tank (21) is formed in the circular arc convex downward in the direction substantially parallel to the rotating shaft (23).
Also in this modified example, when the stirring blade (23) rotates, the propulsive force caused by the water flow generated by the rotation can be applied evenly and uniformly to the sand settled on the bottom surface of the transport tank (21), and the sand It becomes possible to convey efficiently.
In this modified example, since a larger space (28) is formed between the rotating shaft (23) and the stirring blade (24), the resistance of water can be further reduced.

In the rotating body (22) shown in FIGS. 6 and 7, the blade mounting frames (27) adjacent to each other in the circumferential direction around the rotating shaft (23) are formed by a belt-like plate (29) curved in an arc shape. Are connected to each other. And the strip | belt-shaped board (29) becomes circular shape centering on the rotating shaft (23) as a whole.
In this way, the blade mounting frames (27) provided at the tip of the support member (25) are connected to each other by the belt-like plate (29), so that the stirring blade (24) is resistant to water during rotation. Shaking due to centrifugal force is prevented. Therefore, the rotating body can be rotated at high speed, and the conveyance efficiency can be improved.

Moreover, the rotation direction of the rotating shaft (23) to which the stirring blade (24) is attached is perpendicular to the rotating direction of the rotating shaft (2) of the classification unit (100).
If the rotation directions of both rotation axes are the same (the rotation surfaces are parallel to each other), a smooth flow cannot be formed unless the rotations of both rotation axes are synchronized, but the rotation directions of both rotation axes are perpendicular to each other. By setting the rotation surfaces to be perpendicular to each other, a smooth flow can be obtained without synchronization. As a result, the rotational speed of the rotating shaft (23) can be adjusted independently of the rotating shaft (2), so that the sand transport efficiency can be improved.
In addition, the space of the transport unit (200) can be reduced, and the entire apparatus can be downsized.

  Moreover, since the stirring blade (24) extends in the direction substantially parallel to the rotation shaft around the rotation shaft (23), the flow transferred from the classification unit (100) 24) can be received on the surface in the extending direction (length direction) and sent to the dehydrating unit (300), and excellent transport efficiency can be obtained.

Finally, the configuration of the dehydrating unit (300) will be described.
The dehydrating section (300) is disposed in the dehydrating tank (31) having a bottom surface continuous with the conveying tank (21) of the conveying section (200) and the dehydrating tank (31) and is conveyed from the conveying section (200). There are provided a plurality of buckets (32) for scooping up the sand, and a dewatering mechanism for removing water from the sand scooped up in the plurality of buckets (32). The dehydrating mechanism is omitted in FIGS.
The plurality of buckets (32) are attached to the tips of a plurality (eight in the illustrated example) of arms (34) extending radially from a rotation shaft (33) extending in the same direction as the transport direction.

Hereinafter, a more detailed configuration of the dehydrating unit (300) will be described with reference to FIGS.
A rotating cylinder (35) is supported on the upper part of the dewatering tank (31), and the rotating cylinder (35) is fixed to a rotating shaft (33) and rotated by a motor (36) provided at the rear part.
A disc-shaped attachment body (38) is fixed to the center of the rotary cylinder (35) in the axial direction, and the drainage tank is respectively attached to the attachment body (38) via a plurality of arms (34) extending in the radial direction. (39) is connected to the tip, and a bucket (32) is connected to the front surface of each drainage tank (39).
That is, the drainage tank (39) is fixed to the rear part of the front end side of the arm (34), and the front part of the drainage tank (39) is fixed to the lower part of the bucket (32) so that the bucket (32) is viewed from the side. It protrudes forward.

The upper surface of the bucket (32) is opened, and the interior is partitioned vertically by a draining net (41). The upper part of the draining net (41) is a place for depositing sand (precipitate), and the lower part from the draining net (41) is a falling part of the separated water drained.
Moreover, the tip shape of the bucket (32) is inclined so as to be easy to crawl.

  The drainage tank (39) has a drainage hole (40) at the rear lower end, and is separated by passing through the drainage net (41) by connecting to the outlet (42) below the drainage net of the bucket (32). Water is received and drained from the drain hole (40) back to the dehydration tank (21). The drain tank (39) is fixed to the bucket (32) in a state where it is slightly lowered and inclined so that the separated water that has passed through the draining net (41) can be easily passed.

  (43) is a lid opening / closing member for the drain hole (40), and a seesaw material (44) is attached to the protruding shaft (341) of the arm (34). One end of the seesaw material (44) is provided with a rubber lid (45) for closing the drain hole (40) of the drainage tank, and the other end of the seesaw material (44) is connected to the lid (45). A heavy weight (46) is attached.

The suction device (47) sucks the inside of the drainage tank (39) within a range in which each bucket (32) is rotationally displaced upward from a substantially horizontal state to a vertical state.
That is, the suction pipe (49) connected to the suction side of the blower (48) capable of exhibiting a vacuum suction action is connected to the fixed cylinder (50) containing the rotating shaft (33), thereby the fixed cylinder (50). The conduction groove (52) of the suction plate (51) which is fixed to the stationary plate can be in a vacuum state.
The conduction groove (52) is not provided in a position from the substantially horizontal state to the vertical state in the suction plate (51), and opens to the front end surface.

A control plate (53) is fixed to the rear end of the rotary cylinder (35), and circumferentially spaced through holes (54) penetrate the control plate (53) to contact the suction plate (51). is doing.
The suction hose (55) is connected to the respective through holes (54) on the front surface of the control plate (53), and is open-connected to the rear end of the drain tank (39).
(56) is a discharge chute installed at the center upper part, and is located under the bucket (32) which rises and reverses.

Hereinafter, the operation of the dehydrating unit (300) will be described.
First, when sand is conveyed from the conveyance tank (21) of the conveyance unit (200) to the dehydration tank (21), the sand (S) is deposited at the bottom of the dehydration tank (31).
Next, when the motor (36) is driven, the rotating cylinder (35) rotates slowly, and each bucket (32) scoops the sand (S) settled at the bottom as shown in FIG. 3, and separates as shown in FIG. The drained water falls down the draining net (41) and is drained from the drain hole (40) of the drain tank (39). At this time, the lid (45) tries to close the drain hole (40) by the lowering of the weight (46), but the lid (45) is opened by the heavy drain pressure and drained.

  Here, since the conducting groove (52) of the suction plate (51) conducted to the suction pipe (49) by the operation of the blower (48) is always in a vacuum state, the bucket (35) is almost horizontal to upward. 3, the through hole (54) of the control plate (53) communicates with the conduction groove (51) by the suction hose (55). That is, the control plate (53) rotates integrally with the rotating cylinder (35) while being in contact with the suction plate (51), and the through hole (54) communicates with the conduction groove (51).

  As a result, the inside of the drainage tank (39) is sucked and the inside of the drainage tank (39) is in a negative pressure state, so that air from the outside passes between the sand (S) held by the bucket (32) and sand (S ), The remaining water is wiped off and guided to the drain tank (39) to forcibly dehydrate the sand (S).

  At this time, as shown in FIG. 15, the rotational displacement range of the arrow range (L) in FIG. 9 which is the suction action range is a lid ( 45) is moved upward, and the lid (45) strongly closes the drain hole (40) of the drain tank (39) by the suction force, so that outside air does not enter and good suction dehydration can be achieved. . The separated water dehydrated by vacuum suction is accumulated in the drain tank (39).

  When forced dehydration by vacuum suction is completed and reversal starts, as shown in FIG. 10, sand (S) falls on the discharge chute (56), and at this time, the water remaining in the drainage tank (39) Since the drain hole (40) is closed by the lid (45), it does not fall into the dewatering tank (21), but the lid (45) may be opened and dropped by water pressure. It does not fall on the chute (56).

As described above, according to the apparatus according to the present invention, by supplying the object to be processed made of a mixture of water and sand to the classification unit (100), the function of the classification unit (100) makes the particle size larger than a certain size. Sand is transferred to the transport unit (200), then transported to the dehydrating unit (300) by the action of the transport unit (200), and finally dehydrated and collected by the action of the dehydrating unit (300). It becomes.
Therefore, it is possible to carry out the process from classification to dewatering continuously with a single device, and the work efficiency is about 2 to 3 times that of the conventional device where the classification device and dewatering device are separate. It is also possible to improve.

  The sand classification conveyance dehydration apparatus according to the present invention is an apparatus used for efficiently collecting only sand from a mixture of water and sand.

It is a top view of the sand classification conveyance dehydration device concerning the present invention. It is a front view of the sand classification conveyance dehydration device concerning the present invention. It is a right view of the sand classification conveyance dehydration apparatus which concerns on this invention. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. (A) is a CC arrow view of FIG. 1, (b) is an AA arrow view of (a). It is a figure which shows the example of a shape change of a rotary body and a conveyance tank, Comprising: (a) is equivalent to CC arrow view of FIG. 1, (b) is AA arrow view of (a). It is a partial vertical side view of a dehydrating part. It is an expansion perspective view of the bucket and drain tank part of a dehydration part. It is a partially cutaway perspective view of the suction device of the dewatering unit. It is a partially cutaway front view of the lid opening / closing means part of the dehydrating part. It is a partially cutaway front view just before a bucket enters a dehydration tank. It is a partially cutaway front view of a state where the bucket crushes sand. It is a partially cutaway front view of the state where the bucket came out of the water surface of the dehydration tank. It is a partially notched front view of the state which is carrying out forced dehydration by vacuum suction.

Explanation of symbols

100 Classification unit 200 Conveying unit 300 Dehydrating unit 1 Storage tank 2 Central shaft 3 Screw blade 7 Inverter motor 8 Central hole 9 Small hole 12 Support member 13 Ring-shaped member 14 Connecting member 15 Perforated plate 21 Transport tank 22 Rotating body 23 Rotating shaft 24 Stirring blade 32 Bucket 33 Rotating shaft 34 Arm 39 Drain tank 41 Draining net

The invention according to claim 1 is an apparatus for recovering sand from an object to be processed comprising a mixture of water and sand, and transfers the sand from the object to be processed from the upstream side to the downstream side. A classifying unit, a dehydrating unit for removing moisture contained in the sand, and a transporting unit for transporting sand transferred from the classifying unit to the dewatering unit, the classifying unit, the transporting unit, and the dewatering unit Are integrally connected in this order from the upstream side to the downstream side, and the classification part includes a storage tank in which the object to be processed is stored, and a length of the storage tank in the storage tank. A rotatable central axis disposed along the vertical direction and a screw blade spirally provided along the outer peripheral surface of the central shaft, the screw blade being an outer peripheral surface of the central shaft A central hole provided so as to form a space between the central hole and a diameter smaller than that of the central hole. A plurality of small holes formed on a surface in contact with an object, and provided on the outer peripheral surface of the central axis at a predetermined interval along the length direction of the central axis and at a right angle to the central axis. A perforated plate is provided, and the transport unit includes a transport tank having a bottom surface continuous with the storage tank of the classification unit, and a rotation that is disposed in the transport tank and transports sand in a downstream direction by a rotating operation. And the bottom surface of the transport tank is inclined downward toward the downstream direction, the rotating body includes a rotary shaft disposed in a direction perpendicular to the transport direction of the workpiece, and the rotation The present invention relates to a sand classification conveying and dehydrating apparatus comprising a plurality of stirring blades disposed around a shaft .

In the invention according to claim 2, the stirring blade extends around the rotation shaft in a direction substantially parallel to the rotation shaft, and a space is formed between the rotation shaft and the stirring blade. It is related with the sand classification conveyance dehydration apparatus of Claim 1 characterized by the above-mentioned .

The invention according to claim 3 is the sand according to claim 2 , wherein the stirring blade has a shape substantially conforming to the shape of the bottom surface of the transfer tank in a direction substantially parallel to the rotation axis. The present invention relates to a classification transport dehydrator.

The invention according to claim 4 has a plurality of support members extending radially about the rotation shaft, and a blade mounting frame fixed to the tip of the support member, and the stirring blade is the blade mounting frame. 4. The sand according to claim 3, wherein the blade mounting frames that are fixed to each other in the circumferential direction around the rotation axis are connected to each other by a belt-like plate that is curved in an arc shape. The present invention relates to a classification transport dehydrator.

According to a fifth aspect of the present invention, the dehydrating unit is attached to a rotating shaft extending in the same direction as the transport direction, and a tip of an arm extending radially about the rotating shaft, and the rotating shaft rotates. And a plurality of buckets that scoop up the sand that has been transported from the transport unit, and a dewatering mechanism that removes moisture from the sand that has been scooped up in the plurality of buckets. A draining net provided above the bottom of the tank for cutting the water of the scooped sand, a drain tank attached to the bucket, passing through the draining net and receiving the water stored in the bucket bottom, and the drain tank The sand classification conveyance dehydration apparatus according to any one of claims 1 to 4, further comprising a suction device that sucks the inside to create a negative pressure .

In the invention according to claim 6, the pitch of the perforated plate is larger than the pitch of the screw blades, and the diameter of the perforated plate is equal to or smaller than the diameter of the central hole. It is related with the sand classification conveyance dehydration apparatus of Claim 1 characterized by the above-mentioned .

According to a seventh aspect of the present invention, a support member comprising a plurality of radially extending arms is provided on the outer peripheral surface of the central axis, and the plurality of support members are arranged at predetermined intervals along the length direction of the central axis. The plurality of arm tip portions of each support member are connected by a ring-shaped member, and the ring-shaped members are connected by a plurality of connecting members extending along the length direction of the central axis. In addition to being connected, the connecting member also connects adjacent blades of the screw blades, and the perforated plate is disposed across the plurality of radially extending arms. The sand classification conveyance dehydration apparatus according to claim 1 .

According to the first aspect of the present invention, the screw blade is a center provided so as to form a space between the numerous small holes formed in the surface in contact with the workpiece and the outer peripheral surface of the central shaft. By having the hole, when the screw blade is rotated, water can be released from both the small hole and the center hole, so that the resistance of water can be greatly reduced. Therefore, the fluctuation of the water surface in the storage tank can be suppressed to be small, and the water containing sand can be prevented from overflowing from the storage tank, and the sand recovery efficiency can be greatly improved.
In addition, since the resistance of water is small, the rotational speed of the screw can be increased or the outer diameter of the blade can be increased, and the processing efficiency can be greatly improved.
Furthermore, by providing a perforated plate at predetermined intervals along the length direction of the central axis on the outer peripheral surface of the central axis, sand contained in water that escapes downstream through the central hole is present. It can be captured by the hole plate and transported upstream again, and the sand recovery efficiency can be improved. In addition to being able to escape through the holes in the perforated plate, water can also escape through the gap formed between the spiral screw blade and the perforated plate perpendicular to the central axis. Therefore, the resistance of water hardly increases by providing a perforated plate. That is, it is possible to further improve the sand collection efficiency while keeping the resistance of water low.

Further, according to the invention according to claim 1, the bottom surface of the transport tank is inclined downward toward the downstream direction, and the plurality of stirring blades for transporting the sand in the downstream direction by rotating operation in the transport tank are provided. By having the rotating body provided, the action of gravity and the stirring action of the stirring blade can be made to act on the sand that has been transferred from the classifying unit in a coordinated manner, and the sand can be efficiently and reliably It becomes possible to convey to a dehydration part.
  In addition, since the rotating body includes a rotation shaft disposed in a direction perpendicular to the conveyance direction of the workpiece and a plurality of stirring blades disposed around the rotation shaft, the rotation direction of the stirring blade is It becomes perpendicular to the rotation direction of the rotation axis of the classification part. Therefore, it is possible to obtain a smooth flow without synchronizing the rotating shaft of the rotating body and the rotating shaft of the classification unit, it is possible to improve the sand transport efficiency, and to reduce the space of the transport unit, It is possible to reduce the size of the entire apparatus.

According to the second aspect of the present invention, since the stirring blade is extended in a direction substantially parallel to the rotation shaft around the rotation shaft, the flow transferred from the classifying unit is extended by the extension of the stirring blade. It can be received in the direction (length direction) plane and further sent to the downstream side, and excellent transport efficiency can be obtained.
  In addition, since a space is formed between the rotating shaft and the stirring blade, water can escape through the space when the rotating body rotates, the resistance of the water can be kept very small, and only sand can be efficiently used. It becomes possible to convey to a dehydration part.

According to the invention of claim 3, the stirring blade has a shape that substantially conforms to the shape of the bottom surface of the transport tank in a direction substantially parallel to the rotation axis. Propulsive force generated by rotation can be efficiently applied to the sand deposited on the bottom surface, and the sand can be conveyed very efficiently.

According to the invention which concerns on Claim 4, the stirring blade is being fixed to the blade mounting frame, and the blade mounting frames adjacent in the circumferential direction centering on the rotation axis are mutually connected by the belt-shaped plate curved in an arc shape. Since they are connected, it is possible to prevent the stirring blades from shaking due to the resistance of water or centrifugal force during rotation. Therefore, the rotating body can be rotated at high speed, and the conveyance efficiency can be improved.

  According to the invention which concerns on Claim 5, in the dehydration part, since the water contained in the sand scooped up by the bucket can be removed in two stages of the draining net and the suction device, the dehydration process can be efficiently performed in a short time. Can be performed.

According to the invention which concerns on Claim 6, since the arrangement | positioning pitch of a perforated board is large compared with the arrangement | positioning pitch of a screw blade | wing, the flow of the water which passes along the center hole of a screw blade | wing is suppressed by the perforated plate. It is possible to improve sand recovery efficiency while minimizing the phenomenon.
  In addition, since the diameter of the perforated plate is equal to or smaller than the diameter of the center hole of the screw blade, the perforated plate can be provided without dividing the screw, and the transfer of sand by the screw is due to the presence of the perforated plate. There is no hindrance.

According to the seventh aspect of the invention, the screw blade can be securely fixed to the rotating shaft via the fixing means including the arm, the ring-shaped member, and the connecting member, and the same fixing means can be used. Since the perforated plate is fixed, there is no need to separately provide a member for attaching the perforated plate, and an increase in water resistance due to the provision of the perforated plate can be minimized. Further, since the perforated plate is disposed across the arms, the perforated plate can be securely and firmly fixed.

The invention according to claim 1 is an apparatus for recovering sand from an object to be processed comprising a mixture of water and sand, and transfers the sand from the object to be processed from the upstream side to the downstream side. A classifying unit, a dehydrating unit for removing moisture contained in the sand, and a transporting unit for transporting sand transferred from the classifying unit to the dewatering unit, the classifying unit, the transporting unit, and the dewatering unit Are integrally connected in this order from the upstream side to the downstream side, and the classification part includes a storage tank in which the object to be processed is stored, and a length of the storage tank in the storage tank. A rotatable central axis disposed along the vertical direction and a screw blade spirally provided along the outer peripheral surface of the central shaft, the screw blade being an outer peripheral surface of the central shaft A central hole provided so as to form a space between the central hole and a diameter smaller than that of the central hole. A plurality of small holes formed on a surface in contact with an object, and provided on the outer peripheral surface of the central axis at a predetermined interval along the length direction of the central axis and at a right angle to the central axis. A perforated plate is provided, and the transport unit includes a transport tank having a bottom surface continuous with the storage tank of the classification unit, and a rotation that is disposed in the transport tank and transports sand in a downstream direction by a rotating operation. And the bottom surface of the transport tank is inclined downward toward the downstream direction, the rotating body includes a rotary shaft disposed in a direction perpendicular to the transport direction of the workpiece, and the rotation A plurality of stirring blades disposed around the shaft, the stirring blades extending in a direction substantially parallel to the rotation shaft around the rotation shaft, and the rotation shaft and the stirring blade The present invention relates to a sand classification transport dewatering device characterized in that a space is formed between blades .

The invention according to claim 2 is the sand according to claim 1, wherein the stirring blade has a shape substantially conforming to the shape of the bottom surface of the transfer tank in a direction substantially parallel to the rotation axis. The present invention relates to a classification transport dehydrator.

The invention according to claim 3 has a plurality of support members extending radially about the rotation shaft, and a blade mounting frame fixed to the tip of the support member, and the stirring blade is the blade mounting frame. 3. The sand according to claim 2 , wherein the blade mounting frames that are fixed to each other in the circumferential direction around the rotation axis are connected to each other by a strip-like plate curved in an arc shape. The present invention relates to a classification transport dehydrator.

According to a fourth aspect of the present invention, the dewatering unit is attached to a rotating shaft extending in the same direction as the transport direction, and a tip of an arm extending radially about the rotating shaft, and the rotating shaft rotates. A plurality of buckets for scooping up the sand transported from the transport unit, and a dewatering mechanism for removing moisture from the sand scooped up in the plurality of buckets, the dewatering mechanism comprising the bucket A draining net that cuts up the water of the sand that has been scooped up above the bottom of the tank, a drainage tank that is attached to the bucket and that passes through the draining net and receives the water stored at the bottom of the bucket, and the drainage tank The sand classification conveyance dehydration apparatus according to any one of claims 1 to 3, further comprising a suction device that sucks the inside to create a negative pressure .

According to a fifth aspect of the present invention, the pitch of the perforated plate is larger than the pitch of the screw blades, and the diameter of the perforated plate is equal to or smaller than the diameter of the central hole. It is related with the sand classification conveyance dehydration apparatus of Claim 1 characterized by the above-mentioned .

According to the sixth aspect of the present invention, a support member including a plurality of radially extending arms is provided on the outer peripheral surface of the central axis, and the plurality of support members are provided at predetermined intervals along the length direction of the central axis. The plurality of arm tip portions of each support member are connected by a ring-shaped member, and the ring-shaped members are connected by a plurality of connecting members extending along the length direction of the central axis. In addition to being connected, the connecting member also connects adjacent blades of the screw blades, and the perforated plate is disposed across the plurality of radially extending arms. The sand classification conveyance dehydration apparatus according to claim 1.

Further, according to the first aspect of the present invention, since the stirring blade extends around the rotation shaft in a direction substantially parallel to the rotation shaft, the flow transferred from the classification portion is not extended. It can be received on the surface in the installation direction (length direction) and sent further to the downstream side, and excellent transport efficiency can be obtained.
In addition, since a space is formed between the rotating shaft and the stirring blade, water can escape through the space when the rotating body rotates, the resistance of the water can be kept very small, and only sand can be efficiently used. It becomes possible to convey to a dehydration part.

According to the invention according to claim 2 , the stirring blade has a shape that substantially conforms to the shape of the bottom surface of the transport tank in a direction substantially parallel to the rotation axis. Propulsive force generated by rotation can be efficiently applied to the sand deposited on the bottom surface, and the sand can be conveyed very efficiently.

According to the invention of claim 3 , the stirring blades are fixed to the blade mounting frame, and the blade mounting frames adjacent in the circumferential direction around the rotation axis are mutually connected by the belt-shaped plate that is curved in an arc shape. Since they are connected, it is possible to prevent the stirring blades from shaking due to the resistance of water or centrifugal force during rotation. Therefore, the rotating body can be rotated at high speed, and the conveyance efficiency can be improved.

According to the fourth aspect of the present invention, in the dewatering unit, the water contained in the sand that is scooped up by the bucket can be removed in two stages of the draining net and the suction device. Can be performed.

According to the invention which concerns on Claim 5 , since the arrangement | positioning pitch of a perforated board is large compared with the arrangement | positioning pitch of a screw blade, the flow of the water which passes along the center hole of a screw blade is suppressed by the perforated plate. It is possible to improve sand recovery efficiency while minimizing the phenomenon.
In addition, since the diameter of the perforated plate is equal to or smaller than the diameter of the center hole of the screw blade, the perforated plate can be provided without dividing the screw, and the transfer of sand by the screw is due to the presence of the perforated plate. There is no hindrance.

According to the sixth aspect of the invention, the screw blade can be securely fixed to the rotating shaft via the fixing means including the arm, the ring-shaped member, and the connecting member, and the same fixing means can be used. Since the perforated plate is fixed, there is no need to separately provide a member for attaching the perforated plate, and an increase in water resistance due to the provision of the perforated plate can be minimized. Further, since the perforated plate is disposed across the arms, the perforated plate can be securely and firmly fixed.

Here, since the conducting groove (52) of the suction plate (51) conducted to the suction pipe (49) by the operation of the blower (48) is always in a vacuum state, the bucket ( 32 ) is almost horizontal to upward. 3, the through hole (54) of the control plate (53) communicates with the conduction groove ( 52 ) by the suction hose (55). That is, the control plate (53) rotates integrally with the rotating cylinder (35) while being in contact with the suction plate (51), and the through hole (54) communicates with the conduction groove ( 52 ).

When forced dehydration by vacuum suction is completed and inversion starts, as shown in FIG. 8 , sand (S) falls on the discharge chute (56). At this time, the water remaining in the drainage tank (39) Since the drain hole (40) is closed by the lid (45), it does not fall into the dewatering tank (21), but the lid (45) may be opened and dropped by water pressure. It does not fall on the chute (56).

Claims (9)

An apparatus for recovering sand from an object to be treated consisting of a mixture of water and sand,
A classifying unit for transferring sand from the upstream side to the downstream side from the workpiece;
A dewatering section for removing moisture contained in the sand;
It consists of a transport unit that transports sand transferred from the classification unit to the dehydration unit,
The sand classification conveying and dehydrating apparatus, wherein the classification unit, the conveying unit, and the dehydrating unit are integrally connected in this order from the upstream side to the downstream side. The classification unit is
A storage tank in which the object to be processed is stored;
A rotatable central axis disposed inside the storage tank along the length direction of the storage tank;
A screw blade spirally provided along the outer peripheral surface of the central axis,
The screw blade has a center hole provided so as to form a space between the outer peripheral surface of the center shaft and a number of small holes formed on a surface that is smaller in diameter than the center hole and is in contact with the object to be processed. With holes,
The sand classification according to claim 1, wherein a perforated plate is provided on the outer peripheral surface of the central axis at a predetermined interval along the length direction of the central axis and at a right angle to the central axis. Transport dehydrator. The arrangement pitch of the perforated plate is larger than the arrangement pitch of the screw blades,
The sand classification transport dewatering device according to claim 2, wherein the diameter of the perforated plate is equal to or smaller than the diameter of the central hole. A support member comprising a plurality of radially extending arms is provided on the outer peripheral surface of the central axis,
A plurality of the supporting members are provided at predetermined intervals along the length direction of the central axis, and a plurality of arm tip portions in each supporting member are connected by a ring-shaped member,
The ring-shaped members are connected by a plurality of connecting members extending along the length direction of the central axis, and the connecting members also connect adjacent blades of the screw blades,
The sand classification conveyance dehydration device according to claim 2 or 3, wherein the perforated plate is disposed across the plurality of radially extending arms. The transport unit includes a transport tank having a bottom surface continuous with the storage tank of the classification unit, and a rotating body that is disposed in the transport tank and transports sand in a downstream direction by a rotating operation.
The bottom surface of the transfer tank is inclined downward toward the downstream direction,
2. The rotating body includes a rotating shaft disposed in a direction perpendicular to the conveying direction of the workpiece, and a plurality of stirring blades disposed around the rotating shaft. The sand classification conveyance dehydration apparatus in any one of thru | or 4. The stirring blade extends in a direction substantially parallel to the rotating shaft around the rotating shaft,
The sand classification transport dewatering device according to claim 5, wherein a space is formed between the rotating shaft and the stirring blade.   The sand classification conveyance dehydration apparatus according to claim 6, wherein the stirring blade has a shape that substantially conforms to a shape of a bottom surface of the conveyance tank in a direction substantially parallel to the rotation axis. A plurality of support members extending radially about the rotation axis;
Each has a vane mounting frame fixed to the tip of the support member;
The stirring blade is fixed to the blade mounting frame,
The sand classification conveying and dehydrating apparatus according to claim 7, wherein the blade mounting frames adjacent to each other in the circumferential direction about the rotation axis are connected to each other by a strip-like plate curved in an arc shape. The dehydrating part
A rotating shaft extending in the same direction as the conveying direction;
A plurality of buckets attached to the tip of an arm extending radially about the rotation axis, and scooping up sand that has been conveyed from the conveyance unit as the rotation axis rotates;
A dewatering mechanism for removing moisture from the sand that has been scooped into the plurality of buckets;
The dewatering mechanism is provided above the bottom of the bucket and drains the water of the sand that has been scooped up, and is attached to the bucket and passes through the drainage net to receive the water stored in the bucket bottom. The sand classification transport dewatering device according to any one of claims 5 to 8, further comprising a drainage tank and a suction device that sucks the drainage tank into a negative pressure.

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