JP4919351B2 - Dehydrator - Google Patents

Description

  The present invention relates to a dewatering device for dewatering excavated soil having a high water content.

  In the mud pressure shield method, excavated earth and sand taken into the chamber of the shield machine is carried to the ground by a mud pump, a screw conveyor, a belt conveyor, etc., and stored in an earth and sand pit.

  Here, the mud pressure shield has a high moisture content of the excavated earth and sand because of the stability of the face by the mud pressure, so it is handled as industrial waste and the disposal cost is high. In addition, since a large amount of water is contained in the gaps between the soil particles, the weight per unit volume is large and the transportation cost is high. Furthermore, because of tunnel excavation, the amount of excavated sediment is enormous.

  Here, if the excavated sediment is dried by a method such as sun drying, the moisture content will decrease and it can be used as general residual soil, but securing a vast site for sun drying in urban areas is not possible. Not realistic. In addition, if the water content ratio is reduced and the strength is improved by adding cement-based materials such as lime, it can be reused as construction materials. The material cost and the work cost for the addition become high, and it is difficult to apply in terms of economy, coupled with securing the processing site. Moreover, since the pH increases due to the addition of cement-based materials, disposal as general residual soil may be difficult.

  For this reason, various attempts have been made in the past to efficiently reduce the volume and weight of excavated sediment.

JP-A-9-206759 Japanese Patent Laid-Open No. 7-214094 Japanese Utility Model Publication No. 6-66890

  For example, Patent Document 1 discloses a vacuum suction-type dewatering conveyor that includes a mesh belt and a vacuum unit that forcibly vacuum-sucks from the lower side of the mesh belt. According to the vacuum suction-type dewatering conveyor, It is stated that the initial cost of the dehydrator can be reduced.

  However, in such a configuration, the mesh belt needs to have all three roles of dewatering of excavated sediment, prevention of clogging, and support of transport load of sediment, so that each function can be fully exhibited. difficult.

  Therefore, the present applicants have arranged the water permeable belt and the water permeable sheet so that the water permeable sheet overlaps the water permeable belt over a predetermined conveyance section, and the head pulley so that the conveyance speed is the same. And while the object to be dehydrated is being transported in the transport section described above, the water in the object is suctioned and removed by the suction mechanism via the water-permeable sheet and the water-permeable belt. A new dehydrator was developed (Japanese Patent Application 2007-041651).

  According to such a dehydrating apparatus, the water-permeable belt and the water-permeable sheet share the role that the former supports the conveyance load of the object to be dehydrated and the latter blocks the passage of the solid material constituting the object. Thus, in the transport section transported from the tail end side to the nose side, the water in the object placed on the water permeable belt and the water permeable sheet is sucked by the suction mechanism. It becomes possible to suck and dehydrate the moisture in the object with sufficient and high efficiency.

  Here, in the dehydrating device, a fluid ejecting mechanism that ejects gas or liquid from the back side of the water permeable sheet is disposed on the return side of the water permeable sheet, and according to the fluid ejecting mechanism, the fluid permeable sheet adheres to the water permeable sheet. It is possible to prevent the water-permeable sheet from being clogged with the solid material by blowing off the solid material.

  However, the water sprayed from the back side of the water-permeable sheet is rebounded on the back side of the water-permeable sheet and the surroundings of the dehydrator become submerged, and a separate wastewater treatment facility is required to solve this problem. The problem of becoming.

  On the other hand, as a method of removing the solid matter adhered to the water permeable sheet, there is a method of scraping off with a scraper or a method of blowing air, but in the method using a scraper, clogging occurs as the operation is repeated, and the air The spraying method has another problem that the compressor is noisy.

  The present invention has been made in consideration of the above-described circumstances, and provides a dehydrating apparatus that can reliably remove solid matter attached to a water-permeable sheet and prevent clogging of the water-permeable sheet. Objective.

  In order to achieve the above object, a dehydrating apparatus according to the present invention includes an endless water-permeable belt stretched between a first head pulley and a first tail pulley, and a conveying speed. Is endlessly stretched between the second head pulley and the second tail pulley so that the back surface of the water-permeable belt is equal to the conveyance speed of the water-permeable belt and the back surface is overlapped with the surface of the water-permeable belt in a predetermined conveyance section. A water permeable sheet, a suction mechanism for sucking and removing moisture in the object placed on the water permeable sheet in the transport section through the water permeable sheet and the water permeable belt, and the water permeable sheet. And a deposit removing mechanism disposed on the outer peripheral side of the circulation path of the water-permeable sheet, and the deposit removing mechanism is formed by a slit facing the surface of the water-permeable sheet. A hollow body, an injection pipe provided in an inner space of the hollow body and formed with an ejection hole directed to the slit, and an attachment pipe connected to the inner space of the hollow body via a suction pipe for deposit removal It comprises a suction pump for removing a kimono and a cleaning liquid supply means connected to the spray pipe through a cleaning liquid supply pipe so that the slit opening edge of the hollow body can slide on the surface of the water-permeable sheet. The deposit removing mechanism is arranged in the above.

  According to a second aspect of the present invention, the dewatering device according to the present invention has an endless permeable belt that is stretched between the first head pulley and the first tail pulley, and the conveyance speed is the permeable belt. An endless water-permeable sheet that is stretched between the second head pulley and the second tail pulley so that the back surface of the water-permeable belt overlaps with the surface of the water-permeable belt in a predetermined conveyance section. A suction mechanism that sucks and removes moisture in the object placed on the water permeable sheet in the transport section through the water permeable sheet and the water permeable belt; and a return side of the water permeable sheet. A dehydrating mechanism comprising a deposit removing mechanism disposed on the outer peripheral side of the circulation path of the water-permeable sheet;

  Arranged above the dewatering mechanism, the circulation path is opposite to the circulation path of the water permeable belt and the water permeable sheet, and the circulation speed is equal to the conveyance speed of the water permeable belt and the water permeable sheet. An endless pressure belt stretched between the third head pulley and the third tail pulley, and the pressure belt is separated from the surface of the water-permeable sheet in the conveying section by a predetermined distance. A pressure mechanism comprising a pair of travel angle adjustment rollers for adjusting the travel angle of the pressure belt, and a pressure roller disposed between the pair of travel angle adjustment rollers;

  The adhering matter removing mechanism includes a hollow body in which a slit facing the surface of the water-permeable sheet is formed, an injection pipe provided in an inner space of the hollow body and having an ejection hole directed to the slit, and an adhering matter. The hollow body is configured by a suction pump for removing deposits that is connected to the internal space of the hollow body via a suction pipe for removal, and a cleaning liquid supply means that is connected to the jet pipe via a cleaning liquid supply pipe. The debris removing mechanism is characterized in that the deposit removing mechanism is arranged so that the slit opening edge of the sheet is slidable on the surface of the water-permeable sheet.

  In the dehydrating apparatus according to the present invention, a reaction force member is disposed on the back side of the water-permeable belt so as to be slidable with the back surface of the water-permeable belt.

  In the dehydrating apparatus according to the present invention, a water absorbing material is provided on the surface of the pressure belt.

  In the dehydrating apparatus according to the present invention, the suction mechanism includes a suction pump, a suction pipe connected to the suction pump, and a suction member connected to the suction pipe and having a reduced pressure space formed therein. An airtight seal is attached along the opening edge of the suction member, and the suction member is arranged so that the airtight seal is slidable with the back surface of the water-permeable belt.

  In the dehydrating apparatus according to the present invention, a drainage groove is formed on the surface of the water permeable belt, and a drainage hole is formed on the bottom surface of the drainage groove so that the drainage hole communicates with the decompression space of the suction member. The suction member is disposed on the surface.

  In the dehydrating apparatus according to the present invention, the second head pulley is also used as the first head pulley.

  In the dehydrating apparatus according to the present invention, a vibration applying mechanism that applies vibration to the object is disposed on the back side of the water-permeable belt.

  In the dehydrating apparatus according to the present invention, the water permeable belt and the water permeable sheet are arranged so that the water permeable sheet having water permeability and solid matter blocking property overlaps the water permeable belt over a predetermined conveyance section. The first head pulley and the second head pulley are driven so that the transport speeds of the two are the same, and while the target object to be dehydrated is transported in the transport section described above, the water permeability is transmitted from the target object. Water is removed by suction with a suction mechanism through the sheet and the water-permeable belt, and the water content ratio of the object is lowered.

  In other words, the water-permeable belt and the water-permeable sheet play a role in which the former supports the transport load of the object to be dehydrated and the latter prevents the passage of the solid material constituting the object. Moisture in the object placed on the body is sucked by the suction mechanism in the transport section transported from the tail end side to the nose side, and then drained through the water permeable sheet and the water permeable belt.

  Moreover, in the dehydrating apparatus according to the present invention, the deposit attached to the water permeable sheet is removed by the deposit removing mechanism disposed on the return side of the water permeable sheet.

  That is, the cleaning liquid supply means is operated to pump the cleaning liquid into the injection pipe, and the deposit removal suction pump is operated to depressurize the internal space of the hollow body.

  In this way, the cleaning liquid is ejected from the ejection hole formed in the ejection pipe toward the slit, and after passing through the slit, hits the surface of the water permeable sheet to peel off the adhered matter adhered to the water permeable sheet. Or wash away. On the other hand, the cleaning liquid bounced off by the water-permeable sheet and the deposits removed by the cleaning solution are sucked into the hollow body whose pressure is reduced, and further discharged through the suction pipe for removing deposits. In addition, when the internal space of the hollow body is depressurized, air is introduced from the back surface of the water-permeable sheet, and adhering substances are removed while being entrained in the air flow.

  The deposit removal mechanism is arranged so that the slit opening edge of the hollow body is slidable on the surface of the water permeable sheet, so that the cleaning liquid and deposits are compatible with the decompression action of the deposit removal suction pump. It is smoothly sucked into the hollow body and is not scattered outside the hollow body. In addition, since there is no gap between the slit opening edge of the hollow body and the surface of the water permeable sheet, the burden of the suction pump for removing the deposit for obtaining the above-described pressure reducing action is greatly reduced. .

  It is desirable that the hollow body is configured so that reliable decompression can be performed by forming an airtight portion other than the portion where the slit is provided. Such a hollow body can be constituted by, for example, closing both ends of a long box tube, and can form a slit in the longitudinal direction at the corner of the box tube, which can be used as a slit. .

  The injection pipe can be configured using, for example, a cylindrical pipe having a cleaning liquid supply pipe connected at one end and closed at the other end, and a plurality of injection holes are formed in a row in the longitudinal direction in the cylindrical pipe. Can be configured.

  The structure of the suction mechanism is arbitrary as long as moisture can be sucked and removed from the object being conveyed via the water-permeable belt and the water-permeable sheet. For example, the suction mechanism includes a suction pump and a suction pipe connected to the suction pump. And a suction member that is connected to the suction pipe and has a reduced pressure space formed therein, and an airtight seal is attached along an opening edge of the suction member, and the airtight seal is formed by the water-permeable belt. The structure which arrange | positions the said attraction | suction member so that it can slide with the back surface of this can be considered.

  The structure of the water-permeable belt is arbitrary as long as it can pass the moisture sucked from the object while supporting the loading load and the conveyance load of the object to be dehydrated. It is conceivable to form a groove and form a drain hole on the bottom surface of the drain groove, and arrange the suction member so that the drain hole communicates with the decompression space of the suction member.

  The first head pulley and the second head pulley may be provided separately or may be used together. However, in the case of providing them separately, the water-permeable sheet and the water-permeable belt are transported in the same way. Both head pulleys are driven and controlled to achieve speed.

  The state in which the object is supplied to the dehydrator or the dehydration mechanism is arbitrary, but when a vibration imparting mechanism that imparts vibration to the object is disposed on the back side of the water-permeable belt, the vibration imparting mechanism is driven. Thus, water existing in the object can be discharged to the outside in advance, and the dehydration efficiency can be improved by such a configuration.

  Here, in the case of a dehydrating apparatus equipped with a dehydrating mechanism and a pressurizing mechanism, the pressurizing belt constituting the pressurizing mechanism circulates at the same transport speed as the water permeable belt and the water permeable sheet, and is permeable in the transport section. The traveling angle is adjusted by a pair of traveling angle adjusting rollers so as to be separated from the surface of the sheet by a predetermined distance.

  Therefore, the object is conveyed while being sandwiched between the pressure belt, the water permeable belt, and the water permeable sheet, and is pressurized by a pressure roller disposed between the pair of travel angle adjusting rollers during the conveyance. Thus, the dehydration action of the object by the dehydration mechanism is promoted by the pressurization action by the pressurization mechanism, and dehydration is performed with high efficiency.

  The pair of travel angle adjusting rollers can be configured arbitrarily if the travel angle of the pressure belt can be adjusted so that the pressure belt is separated from the surface of the water-permeable sheet in the conveyance section by a predetermined distance. The angle adjusting roller can be configured, for example, by attaching a roller body to a roller attachment body and attaching the roller attachment body to a mount via an adjustment screw.

  As long as the pressure belt can transmit the force from the pressure roller to the object, it may be configured in any way. However, when a water absorbing material is provided on the surface of the pressure belt, the water absorbing material is the object. Since the water discharged from the water is absorbed, the load on the suction mechanism can be reduced, and as a result, the overall dewatering efficiency can be improved.

  Hereinafter, an embodiment when a dehydrating apparatus according to the present invention is applied to a belt conveyor will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is a side view showing a belt conveyor according to the present embodiment. As shown in the figure, a belt conveyor 1 according to the present embodiment includes an endless water-permeable belt 2 and an endless water-permeable sheet 3, and the water-permeable belt 2 is a first head pulley. Between the head pulley 4 and the tail pulley 5 as the first tail pulley, and is circulated between both pulleys by a drive motor (not shown).

  On the other hand, the water permeable sheet 3 is stretched over the head pulley 4 as the second head pulley, the tail pulley 6 as the second tail pulley, and the return rollers 7a, 7b, and 7c, and between each pulley and each by the drive motor (not shown). It circulates between return rollers. Here, the head pulley 4 serves both as a first head pulley and a second head pulley.

  FIG. 2 is a perspective view showing the arrangement of the water permeable belt 2 and the water permeable sheet 3. As can be seen from FIG. 2, the belt conveyor 1 according to the present embodiment has the water permeable belt 2 on the inner peripheral side. It has a double belt structure in which the water-permeable sheet 3 circulates in the direction of the broken line arrow and circulates on the outer peripheral side in the direction of the solid line arrow.

  As shown in FIG. 3, two drain grooves 21 and 21 having a depth of about 3 mm are formed on the surface of the water permeable belt 2 so as to be orthogonal to the transport direction, with a belt center line parallel to the transport direction as an axis of symmetry. In addition, drain holes 22 are formed on the bottom surfaces of the drain grooves.

  Such a water-permeable belt 2 can be made of a conventionally known material. In addition, on both edges of the water-permeable belt 2, wave bridges 23 and 23 are erected along the conveyance direction to prevent the excavated earth and sand as an object to be dewatered from spilling during conveyance. It plays the role of a side guard.

  The water permeable sheet 3 is formed of a non-woven fabric so as to have water permeability and solid matter blocking properties.

  Here, the water-permeable belt 2 and the water-permeable sheet 3 are configured so that the conveying speed of both is equal by driving the head pulley 4 with a drive motor (not shown), as can be seen well in FIG. The water-permeable belt 2 is stretched over the head pulley 4 and the tail pulley 5 so that the back surface of the water-permeable sheet 3 is overlapped with the surface of the water-permeable belt 2 in the conveyance section A, and the water-permeable sheet 3 is attached to the head pulley 4 and the return roller. 7 a, 7 b, 7 c and the tail pulley 6.

  As shown in FIG. 1, the belt conveyor 1 according to the present embodiment sucks moisture in excavated earth and sand placed on the water permeable sheet 3 in the conveyance section A described above through the water permeable sheet and the water permeable belt 2. A suction mechanism 12 for removing is provided. The suction mechanism includes a suction pump 10, a suction pipe 9 connected to the suction pump, and a box cross-sectional shape in which a decompression space is formed in communication with the suction pipe. And the suction member 8.

  The conveyance section A may have a length required for dewatering as a basic length, and the basic length may be appropriately increased according to a necessary conveyance distance required as a belt conveyor.

  As shown in FIG. 3, the suction member 8 has an airtight seal 24 attached along the edge of the opening, so that the airtight seal is slidable with the back surface of the water permeable belt 2, and the water permeable belt 2. The drainage holes 22 formed in the upper portion are arranged along the transport direction of the water-permeable belt 2 so as to communicate with the decompression space of the suction member 8. The hermetic seal 24 may be formed of, for example, ultra high molecular polyethylene having a small friction coefficient.

  As shown in FIG. 1, the belt conveyor 1 according to the present embodiment includes a deposit removing mechanism 101 disposed on the return side of the water permeable sheet 3 and on the outer peripheral side of the circulation path of the water permeable sheet.

  As shown in FIGS. 4 and 5, the deposit removing mechanism 101 includes a hollow body 102 constituted by a long box tube, an injection tube 103 disposed inside the hollow body, and a suction for removing deposits. A suction pump 105 for removing deposits communicated to the internal space 106 of the hollow body 102 via the pipe 104; a water tank 108 as a cleaning liquid supply means connected to the injection pipe 103 via the cleaning liquid supply pipe 107; It consists of

  The hollow body 102 is formed with slits 109 facing the surface of the water permeable sheet 3, and the ejection pipe 103 is formed with a plurality of ejection holes 110 directed toward the slits 109 along the material axis direction. In addition, the deposit removing mechanism 101 is arranged so that the slit opening edges 111 of the hollow body 102 can slide on the surface of the water-permeable sheet 3.

  Friction reducing members 112, 112 made of round bars are fixed to the slit opening edges 111, 111 along the longitudinal direction, respectively, to reduce friction with the water permeable sheet 3. The wear of the part is suppressed.

  The hollow body 102 is secured with airtightness by fixing the closing plates 113 and 113 in contact with both ends of a square tube having a cross section of about 10 cm × 10 cm and a length of about 3 m, for example. Of these, one corner may be cut out in the length direction. The injection tube 103 described above may be disposed so as to penetrate between the closing plates 113 and 113 so as to ensure airtightness.

  The belt conveyor 1 according to the present embodiment includes a hopper 14 for introducing excavated earth and sand, and a belt conveyor 15 that functions as a supply feeder is disposed below the hopper 14, and the excavated earth and sand introduced into the hopper 14 are belted. The conveyor 15 can supply the permeable belt 2 and the permeable sheet 3 to the conveyance start position.

  In order to dewater the excavated earth and sand using the belt conveyor 1 according to the present embodiment, first, the excavated earth and sand to be dehydrated is put into the hopper 14. Excavation sediments include all excavation sediments having a high water content ratio generated in civil engineering construction work, for example, excavation sediments generated in mud pressure shield construction. As such excavated earth and sand, for example, what has been conveyed from a belt conveyor installed on the upstream side may be put into the hopper 14.

  Next, the excavated earth and sand thrown into the hopper 14 is transferred by the belt conveyor 15, and placed on the water-permeable belt 2 and the water-permeable sheet 3 at the transfer start position (start point of the transfer section A).

  Here, the water permeable sheet 3 has water permeability and solid matter blocking properties, and drain holes 22 are formed in the water permeable belt 2 on which the water permeable sheets are stacked. Further, the suction member 8 is formed in the permeable belt 2 so that the airtight seal 24 attached to the opening edge thereof is slidable on the back surface of the permeable belt 2 and a decompression space which is a box cross-sectional space. It arrange | positions so that it may communicate with the drain hole 22 made.

  Therefore, when the suction pump 10 is driven and the air in the decompression space formed in the suction member 8 is extracted, the moisture in the excavated soil is separated from the soil particles and discharged to the outside. And while this water | moisture content is isolate | separated from the soil particle by the filtration effect | action by the water-permeable sheet 3, it passes through this water-permeable sheet, and is further collected in the drain groove 21 of the water-permeable belt 2, and then through the water drain hole 22. It flows through the suction pipe 9 and is drained. On the other hand, the excavated earth and sand from which moisture has been removed and the water content ratio has fallen are carried out to the left side in FIG.

  On the other hand, the permeable belt 2 and the permeable sheet 3 that have finished transporting the excavated earth and sand turn around the head pulley 4, and then the permeable belt 2 returns to the tail pulley 5. It leaves and goes to the return roller 7a.

  Next, the water-permeable sheet 3 returns to the tail pulley 6 through the return rollers 7a, 7b, and 7c, and is again stacked on the water-permeable belt 2 by the tail pulley 5. In the return path, the head pulley 4 and the return roller 7a By passing the deposit removing mechanism 101 installed between the two, the soil particles adhering to the surface are removed.

  That is, water as a cleaning liquid is pumped from the water tank 108 into the injection pipe 103, and the deposit removing suction pump 105 is operated to depressurize the internal space of the hollow body 102.

  In this way, as shown in FIG. 6, the water as the cleaning liquid is ejected from the ejection hole 110 formed in the ejection pipe 103 toward the slit 109, and after passing through the slit 109, the surface of the water-permeable sheet 3. (As FIG. 6 shows the arrangement state on the return side, the upper side is the back surface and the lower side is the front surface), and the soil particles, which are attached to the water-permeable sheet, are peeled off or washed away.

  On the other hand, the water bounced off by the water-permeable sheet 3 and the soil particles removed by the water are sucked into the hollow body 102 which is decompressed as shown by the arrow in FIG. It is discharged through the tube 104.

  Further, when the internal space of the hollow body 102 is depressurized, air is introduced from the back surface of the water permeable sheet 3 and soil particles are removed while being entrained in the flow of the air.

  As described above, according to the belt conveyor 1 according to the present embodiment, the belt structure has a double structure, and the transport load of excavated earth and sand is supported by the water permeable belt 2, while the role of blocking the passage of soil particles is prevented. Since it owed to the water-permeable sheet 3, it becomes possible to manufacture the water-permeable belt 2 and the water-permeable sheet 3 according to each role, and can improve a dehydration efficiency significantly.

  Moreover, according to the belt conveyor 1 which concerns on this embodiment, the return route of the water-permeable sheet 3 is provided separately from the return route of the water-permeable belt 2, and the deposit removal mechanism 101 is provided in the return route of the water-permeable sheet 3. Since the deposit removing mechanism is arranged so that the slit opening edges 111, 111 of the hollow body 102 are slidable on the surface of the water-permeable sheet 3, water and soil particles are Combined with the pressure reducing action by the suction pump 104 for removing the adhering matter, the air is smoothly sucked into the hollow body 102 and is not scattered outside the hollow body 102.

  In addition, by appropriately adjusting the pressure of the water ejected from the ejection pipe 103 with the regulating valve 114, it becomes possible to reliably remove the soil particles adhering to the water permeable sheet 3 and prevent clogging. . According to the applicant's verification test, when the conveyance speed of the water-permeable sheet 3 is about 2 to 5 m / min, the soil particles stuck to the entire surface of the water-permeable sheet 3 are almost completely visible until the surface of the nonwoven fabric is visible. Soil particles could be completely removed.

  In addition, since there is no gap between the slit opening edges 111, 111 of the hollow body 102 and the surface of the water permeable sheet 3, the burden on the suction pump 105 for removing the deposits for obtaining the above-described decompression action Can be greatly reduced.

  Moreover, according to the belt conveyor 1 which concerns on this embodiment, the airtight seal 24 is attached along the opening edge part of the suction member 8, and this airtight seal is slidable with the back surface of the water-permeable belt 2, and Since the suction member 8 is arranged along the conveyance direction of the water permeable belt 2 so that the drain hole 22 formed in the water permeable belt 2 communicates with the decompression space of the suction member 8, the suction member 8 and the water permeable belt The airtightness with the back surface of the conductive belt 2 becomes high, and it becomes possible to increase the dewatering efficiency by reducing the pressure loss due to air leakage.

  In the present embodiment, the head pulley 4 is a first head pulley and a second head pulley, and the drive pulley of the water-permeable sheet 3 and the drive pulley of the water-permeable belt 2 are combined. A head pulley may be provided individually. In this case, a control means for making the conveyance speed of the water-permeable sheet 3 and the conveyance speed of the water-permeable belt 2 the same is installed as necessary.

  In this embodiment, the airtight seal 24 increases the airtightness at the time of suction. However, if the pressure loss is not a problem, the airtight seal 24 may be omitted.

  Moreover, in this embodiment, although the water-permeable sheet 3 was comprised with the nonwoven fabric, as long as the passage of a soil particle can be prevented, the material is arbitrary and it replaces with a nonwoven fabric and employ | adopts the sheet | seat formed in mesh shape suitably. be able to.

  In the present embodiment, the case where the dehydrating apparatus of the present invention is applied to a belt conveyor has been described. However, the conveyance function is not necessarily required, and the conveyance section of the water-permeable belt and the water-permeable sheet is short, so that the belt is substantially used. It does not matter if it cannot be used as a conveyor.

  In connection with this, as a form of use of the dehydrating apparatus according to the present embodiment, as a belt conveyor, a continuous bellcon is formed together with other belt conveyors. A usage form such as installing in a plant as a dehydrating device is conceivable.

  Further, in the present embodiment, the object to be dehydrated is excavated earth and sand having a high water content ratio, but the dewatering apparatus according to the present invention is not limited to such an application, and in a wide industrial field such as the chemical field and the food field. It is possible to use.

  Although not particularly mentioned in the present embodiment, as shown in FIG. 7, a vibrator 61 as a vibration imparting mechanism that imparts vibration to a dewatered object such as excavated earth and sand is disposed on the back side of the water permeable belt 2. Also good.

  In such a configuration, by driving the vibrator 61, it is possible to discharge the water present in the object to be dehydrated to the outside in advance, and it is possible to improve the dewatering efficiency.

  Although not specifically mentioned in the present embodiment, a scraper that scrapes off the soil particles in advance may be installed on the upstream side of the deposit removing mechanism 101 when removing the soil particles adhering to the water permeable sheet 3. Absent.

  According to this configuration, the burden on the deposit removing mechanism 101 can be reduced, and more complete soil particle removal by the deposit removing mechanism 101 is possible.

  After operating the belt conveyor 1 which concerns on the said embodiment, and performing dehydration of excavated earth and sand, the water-permeable sheet 3 was removed, and as a result of performing a water-permeable test with an unused water-permeable sheet and comparing, the water permeability coefficient of both was almost It was equivalent. From this water permeability test, it was found that the deposit removing mechanism 101 can perform a sufficient removing action.

(Second Embodiment)

  Next, a second embodiment will be described. Note that components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 8 is a side view showing the belt conveyor according to the present embodiment. As shown in the figure, a belt conveyor 201 according to the present embodiment includes a dehydrating mechanism 1a and a pressurizing mechanism 1b.

  The dewatering mechanism 1a includes an endless water-permeable belt 2 and an endless water-permeable sheet 3, and the water-permeable belt 2 is a head pulley 4 that is a first head pulley and a first tail pulley. It spans the tail pulley 5 and circulates between both pulleys by the drive motor 31. The head pulley 4 also serves as the second head pulley.

  On the other hand, the water-permeable sheet 3 is stretched over the head pulley 4, the tail pulley 6 that is the second tail pulley, and the return rollers 7a, 7b, and 7c, and is circulated between the pulleys and between the return rollers by the drive motor 31. It has become.

  As shown in FIG. 9, the dewatering mechanism 1a has a double belt structure in which the water permeable belt 2 circulates in the inner peripheral side in the direction of the broken arrow, and the water permeable sheet 3 circulates in the outer peripheral side in the direction of the solid arrow. The water permeable belt 2 and the water permeable sheet 3 are configured such that both the conveying speeds are equalized by driving the head pulley 4 by the drive motor 31, and the back surface of the water permeable sheet 3 is in the conveying section A. The permeable belt 2 is stretched over the head pulley 4 and the tail pulley 5 and the permeable sheet 3 is spanned over the head pulley 4, the return rollers 7 a, 7 b, 7 c and the tail pulley 6 so as to overlap the surface of the permeable belt 2. It is. Hereinafter, since the water-permeable belt 2 and the water-permeable sheet 3 were demonstrated in detail in 1st Embodiment, the description is abbreviate | omitted here.

  As shown in FIG. 8, the dewatering mechanism 1 a removes moisture in the excavated sediment as an object of dewatering placed on the water permeable sheet 3 in the conveyance section A through the water permeable sheet and the water permeable belt 2. A suction mechanism 12 for sucking and removing is provided. The suction mechanism includes a suction pump 10, a suction pipe 9 connected to the suction pump, and a box cross-section in which a reduced pressure space is formed in communication with the suction pipe. It is comprised with the suction member 8 of a shape.

  Since the suction mechanism 12 has been described in detail in the first embodiment, the description thereof is omitted here. Further, as shown in FIG. 8, the dehydrating mechanism 1a includes a deposit removing mechanism 101 disposed on the return side of the water permeable sheet 3 and on the outer peripheral side of the circulation path of the water permeable sheet. Since 101 has already been described in the first embodiment, the description thereof is omitted here.

  As shown in FIG. 8, the pressurizing mechanism 1b is disposed above the dehydrating mechanism 1a, and is endlessly stretched between a head pulley 33 that is a third head pulley and a tail pulley 34 that is a third tail pulley. A pressure belt 32 having a shape is provided.

  Here, as is well understood in FIG. 9, the circulation path of the pressure belt 32 is opposite to the circulation path of the water-permeable belt 2 and the water-permeable sheet 3 (counterclockwise in the figure), that is, clockwise in the figure. Thus, the head pulley 33 and the tail pulley 34 are stretched so that the circulation speed is equal to the conveyance speed of the water-permeable belt 2 and the water-permeable sheet 3.

  The pressure mechanism 1b includes a pair of travel angle adjustment rollers 35 and 35 that adjust the travel angle of the pressure belt 32 so that the pressure belt 32 is separated from the surface of the water-permeable sheet 3 in the conveyance section A by a predetermined distance; And a pressure roller 36 disposed between the pair of travel angle adjusting rollers.

  Here, as shown in FIG. 10, each traveling angle adjustment roller 35 is configured by attaching a roller body 51 to a roller attachment body 52 and attaching the roller attachment body to a mount 54 via an adjustment screw 53. According to the configuration, the pressure belt 32 is pressed from the back surface by the roller body 51 to determine the traveling angle of the pressure belt, and the installation height of the roller body 51 is adjusted by the adjustment screw 53, The pressing position of the pressure belt 32 can be adjusted.

  The pressure roller 36 is attached to the gantry 54 via a U-shaped frame 55 and adjustment screws 56, 56. With this configuration, pressure can be loaded on the pressure belt 32 from the back surface thereof. The installation height of the U-shaped frame 55 can be adjusted by adjusting screws 56, 56, and the pressure acting position of the pressure belt 32 can be adjusted.

  The belt conveyor 201 according to the present embodiment includes a hopper 14 for introducing excavated earth and sand, and a belt conveyor 15 that functions as a supply feeder is disposed below the hopper 14, and the excavated earth and sand introduced into the hopper 14 is belted. The conveyor 15 can supply the water-permeable belt 2 and the water-permeable sheet 3 constituting the dewatering mechanism 1a to the conveyance start position.

  In order to dewater the excavated earth and sand using the belt conveyor 201 according to the present embodiment, first, the excavated earth and sand to be dehydrated is put into the hopper 14. Excavation sediments include all excavation sediments having a high water content ratio generated in civil engineering construction work, for example, excavation sediments generated in mud pressure shield construction. As such excavated earth and sand, for example, what has been conveyed from a belt conveyor installed on the upstream side may be put into the hopper 14.

  Next, the excavated earth and sand thrown into the hopper 14 is transferred by the belt conveyor 15, and placed on the water-permeable belt 2 and the water-permeable sheet 3 at the transfer start position (start point of the transfer section A).

  Here, the water-permeable sheet 3 has water permeability and soil particle blocking properties, and drain holes 22 are formed in the water-permeable belt 2 on which the water-permeable sheet is stacked. Further, the suction member 8 is formed in the permeable belt 2 so that the airtight seal 24 attached to the opening edge thereof is slidable on the back surface of the permeable belt 2 and a decompression space which is a box cross-sectional space. It arrange | positions so that it may communicate with the drain hole 22 made.

  Therefore, when the suction pump 10 is driven and the air in the decompression space formed in the suction member 8 is extracted, the moisture in the excavated soil is separated from the soil particles and discharged to the outside. And while this water | moisture content is isolate | separated from the soil particle by the filtration effect | action by the water-permeable sheet 3, it passes through this water-permeable sheet, and is further collected in the drain groove 21 of the water-permeable belt 2, and then through the water drain hole 22. It flows through the suction pipe 9 and is drained.

  On the other hand, the pressure belt 32 constituting the pressure mechanism 1b circulates at the same conveyance speed as the water permeable belt 2 and the water permeable sheet 3, and is separated from the surface of the water permeable sheet 3 in the conveyance section A by a predetermined distance. Further, the traveling angle is adjusted by a pair of traveling angle adjusting rollers 35, 35.

  Therefore, as shown in FIG. 10, the excavated earth and sand 57 is conveyed while being sandwiched between the pressure belt 32, the water permeable belt 2 and the water permeable sheet 3, and a pair of travel angle adjusting rollers 35, The pressure is applied by a pressure roller 36 disposed between the two.

  Thus, the excavated sediment 57 is accelerated by depressurization by the pressurizing mechanism 1b, and the excavated sediment with the moisture content removed and the moisture content reduced is located at the end of the transport section A at the left side in FIG. It is carried out.

  The separation distance between the pressure belt 32 and the water permeable belt 2 and the water permeable sheet 3 may be determined as appropriate in consideration of, for example, the degree of dewatering and the processing efficiency of the excavated earth and sand. If the distance is small and processing efficiency is important, the separation distance may be large.

  On the other hand, the permeable belt 2 and the permeable sheet 3 that have finished transporting the excavated earth and sand turn around the head pulley 4, and then the permeable belt 2 returns to the tail pulley 5. It leaves and goes to the return roller 7a.

  Next, the water-permeable sheet 3 returns to the tail pulley 6 through the return rollers 7a, 7b, and 7c, and is again stacked on the water-permeable belt 2 by the tail pulley 5. In the return path, the head pulley 4 and the return roller 7a By passing the deposit removing mechanism 101 installed between the two, the soil particles adhering to the surface are removed.

  That is, water as a cleaning liquid is pumped from the water tank 108 into the injection pipe 103, and the deposit removing suction pump 105 is operated to depressurize the internal space of the hollow body 102.

  In this way, as already described in FIG. 6 (first embodiment), the water that is the cleaning liquid is ejected from the ejection hole 110 formed in the ejection pipe 103 toward the slit 109 and passes through the slit 109. Thereafter, the soil particles that hit the surface of the water-permeable sheet 3 and adhere to the water-permeable sheet are peeled off or washed away.

  On the other hand, the water bounced off by the water-permeable sheet 3 and the soil particles removed by the water are sucked into the hollow body 102 that has been depressurized, and then discharged through the suction pipe 104 for removing the deposits.

  Further, when the internal space of the hollow body 102 is depressurized, air is introduced from the back surface of the water permeable sheet 3 and soil particles are removed while being entrained in the flow of the air.

  As described above, according to the belt conveyor 201 according to the present embodiment, the belt structure of the dewatering mechanism 1a has a double structure, and the conveyance load of excavated earth and sand is supported by the water permeable belt 2, while the passage of soil particles is prevented. Since the water-permeable sheet 3 has a role to prevent, the water-permeable belt 2 and the water-permeable sheet 3 can be manufactured according to the respective roles, and the dewatering efficiency can be greatly improved.

  Further, according to the belt conveyor 201 according to the present embodiment, the return route of the water permeable sheet 3 is provided separately from the return route of the water permeable belt 2, and the deposit removal mechanism 101 is provided in the return route of the water permeable sheet 3. Since the deposit removing mechanism is arranged so that the slit opening edges 111, 111 of the hollow body 102 are slidable on the surface of the water-permeable sheet 3, water and soil particles are Combined with the pressure reducing action by the suction pump 104 for removing the adhering matter, the air is smoothly sucked into the hollow body 102 and is not scattered outside the hollow body 102.

  In addition, by appropriately adjusting the pressure of the water ejected from the ejection pipe 103 with the regulating valve 114, it becomes possible to reliably remove the soil particles adhering to the water permeable sheet 3 and prevent clogging. . According to the applicant's verification test, when the conveyance speed of the water-permeable sheet 3 is about 2 to 5 m / min, the soil particles stuck to the entire surface of the water-permeable sheet 3 are almost completely visible until the surface of the nonwoven fabric is visible. Soil particles could be completely removed.

  In addition, since there is no gap between the slit opening edges 111, 111 of the hollow body 102 and the surface of the water permeable sheet 3, the burden on the suction pump 105 for removing the deposits for obtaining the above-described decompression action Can be greatly reduced.

  Further, according to the belt conveyor 201 according to the present embodiment, the airtight seal 24 is attached along the opening edge portion of the suction member 8 constituting the dewatering mechanism 1 a, and the airtight seal is slidable on the back surface of the water permeable belt 2. Since the suction member 8 is arranged along the conveyance direction of the water-permeable belt 2 so that the drain hole 22 formed in the water-permeable belt 2 communicates with the decompression space of the suction member 8 In addition, the airtightness between the suction member 8 and the back surface of the water permeable belt 2 is increased, and it is possible to reduce the pressure loss due to air leakage and increase the dewatering efficiency.

  Moreover, according to the belt conveyor 201 which concerns on this embodiment, while the pressure belt 32 which comprises the pressurization mechanism 1b is circulated at the same conveyance speed as the water-permeable belt 2 and the water-permeable sheet 3, the water permeability in a conveyance area is demonstrated. Since the traveling angle is adjusted by the pair of traveling angle adjusting rollers 35, 35 so as to be separated from the surface of the sheet 3 by a predetermined distance, the excavated earth and sand are between the pressure belt 32, the permeable belt 2 and the permeable sheet 3. In addition to being transported while being sandwiched, the pressure is applied by a pressure roller 36 disposed between the pair of travel angle adjusting rollers 35 and 35 during transport.

  Therefore, the dewatering action of the excavated earth and sand by the dewatering mechanism 1a is promoted by the pressurizing action of the pressurizing mechanism 1b, and thus the excavated earth and sand can be dehydrated with higher efficiency.

  Moreover, according to the belt conveyor 201 which concerns on this embodiment, as above-mentioned, the suction member 8 is made along the conveyance direction of the water-permeable belt 2 so that the airtight seal | sticker 24 can slide with the back surface of the water-permeable belt 2. Since they are arranged, the pressure loaded by the pressurizing mechanism 1b is supported by the suction member 8, and a reaction force is generated by the suction member. Incidentally, the suction member 8 may be fixed to the gantry 54, for example.

  That is, the suction member 8 not only serves to form a decompression space on the back side of the drain hole 22 formed in the water permeable belt 2, but also supports the pressure from the pressure mechanism 1 b on the back side of the water permeable belt 2. Also serves as a reaction force member.

  Therefore, the pressure by the pressurizing mechanism 1 b acts on the excavated earth and sand without escaping, and the excavated earth and sand is sufficiently dehydrated between the pressure belt 32, the water permeable belt 2, and the water permeable sheet 3.

  In the present embodiment, the head pulley 4 of the dehydrating mechanism 1a is used as the first head pulley and the second head pulley, and the drive pulley of the water permeable sheet 3 and the drive pulley of the water permeable belt 2 are combined. Instead of this, a head pulley may be provided individually. In this case, a control means for making the conveyance speed of the water-permeable sheet 3 and the conveyance speed of the water-permeable belt 2 the same is installed as necessary.

  In this embodiment, the airtight seal 24 increases the airtightness at the time of suction. However, if the pressure loss is not a problem, the airtight seal 24 may be omitted.

  Moreover, in this embodiment, although the water-permeable sheet 3 was comprised with the nonwoven fabric, as long as the passage of a soil particle can be prevented, the material is arbitrary and it replaces with a nonwoven fabric and employ | adopts the sheet | seat formed in mesh shape suitably. be able to.

  In the present embodiment, the case where the dewatering device for excavated earth and sand according to the present invention is applied to the belt conveyor has been described, but the conveyance function is not necessarily required, and the conveyance section of the water permeable belt and the water permeable sheet is short. It does not matter if it cannot be substantially used as a belt conveyor.

  In this regard, as a form of use of the dewatering device according to the present embodiment, as a belt conveyor, a continuous bell-cone with other belt conveyors, as a dewatering device for excavated earth and sand, appropriately disposed between the belt conveyors, A usage form such as installation in a plant as a stationary type dewatering device for excavated sediment is conceivable.

  Although not particularly mentioned in the present embodiment, a reaction member may be separately provided when the pressure by the pressurizing mechanism 1b cannot be supported by the suction member 8 alone.

  FIG. 11 shows a modification in which a plurality of reaction force members 52 are arranged in parallel on the back side of the water-permeable belt 2 so as to be slidable with the back surface of the water-permeable belt 2.

  As can be seen from the figure, the reaction force member 52 is disposed in parallel to the conveyance axis of the water-permeable belt 2 at a position excluding the place where the suction member 8 is disposed, and does not hinder the operation of the carrier roller 51. For example, the length is set slightly shorter than the pitch of the carrier rollers 51 and 51, for example. The reaction force member 52 may be appropriately fixed to the gantry 54 like the suction member 8.

  The reaction force member 52 can be formed of ultrahigh molecular weight polyethylene having a small friction coefficient, like the airtight seal 24 attached to the opening edge of the suction member 8. In addition, the reaction force member 52 is formed of an elastic material, or an elastic member such as rubber is used so that the airtightness between the suction member 8 and the water-permeable belt 2 by the airtight seal 24 is not impaired by the installation of the reaction force member 52. Thus, the reaction force member 52 is attached to the mount 54.

  Although not particularly mentioned in the present embodiment, a porous sheet as a water absorbing material, for example, a sponge sheet, may be attached to the surface of the pressure belt 32.

  According to such a configuration, since the sponge sheet absorbs water discharged from the excavated earth and sand, the load on the suction mechanism 12 can be reduced, and as a result, the dewatering efficiency of the belt conveyor 201 which is a dewatering device can be improved. It becomes possible.

  Although not particularly mentioned in the present embodiment, as shown in FIG. 12, a vibrator 61 as a vibration applying mechanism that applies vibration to the excavated earth and sand may be disposed on the back side of the water-permeable belt 2.

  In such a configuration, by driving the vibrator 61, it is possible to drain water existing in the soil particle gap of the excavated sediment in advance to the outside of the soil mass, and this configuration can also improve dewatering efficiency.

The whole figure of the belt conveyor concerning this embodiment. The perspective view of the water-permeable belt 2 and the water-permeable sheet 3. FIG. It is a figure of the water-permeable belt 2 and the water-permeable sheet 3, (a) is a top view, (b) is sectional drawing along a BB cross section. It is a diagram of the deposit removal mechanism 101, (a) is a cross-sectional view seen from the material axis direction of the hollow body 102, (b) is an overall view showing a cleaning liquid supply path and a cleaning liquid and deposit recovery path, (c) is a perspective view of the injection pipe 109. Similarly side view. It is the figure which showed a mode that the deposit | attachment removal mechanism 101 removed the deposit | attachment, (a) is a perspective view, (b) is sectional drawing. The figure which showed the arrangement | positioning condition of the vibrator 61. FIG. The whole figure of the belt conveyor concerning a 2nd embodiment. The perspective view which showed the arrangement | positioning condition of the water-permeable belt 2, the water-permeable sheet 3, and the pressurization belt 32. FIG. FIG. 3 is a detailed view showing a running angle adjustment roller 35 and a pressure roller 36. It is the figure which showed the installation condition of the reaction force member 52, (a) is a top view, (b) is sectional drawing along CC cross section. The figure which showed the arrangement | positioning condition of the vibrator 61. FIG.

Explanation of symbols

1,201 Belt conveyor (dehydrator)
DESCRIPTION OF SYMBOLS 1a Dehydration mechanism 1b Pressurization mechanism 2 Water-permeable belt 3 Water-permeable sheet 4 Head pulley (1st head pulley)
5 Tail pulley (first tail pulley)
6 Tail pulley (second tail pulley)
8 Suction member 9 Suction tube 10 Suction pump 12 Suction mechanism 21 Drain groove 22 Drain hole 24 Airtight seal 32 Pressure belt 33 Head pulley (third head pulley)
34 Tail pulley (third tail pulley)
35 Traveling angle adjusting roller 36 Pressure roller 52 Reaction force member 61 Vibrator (vibration applying mechanism)
DESCRIPTION OF SYMBOLS 101 Deposit removal mechanism 102 Hollow body 103 Injection pipe 104 Deposit removal suction pipe 105 Deposit removal suction pump 107 Cleaning liquid supply pipe 108 Cleaning liquid supply means 109 Slit 110 Ejection hole 111 Slit opening edge

Claims (8)

An endless permeable belt stretched between the first head pulley and the first tail pulley, the water permeable belt in a predetermined conveyance section so that the conveyance speed is equal to the conveyance speed of the water permeable belt An endless water-permeable sheet that is stretched over the second head pulley and the second tail pulley so as to be superimposed on the surface of the conductive belt, and an object placed on the water-permeable sheet in the transport section A suction mechanism that sucks and removes water through the water-permeable sheet and the water-permeable belt, and a deposit removal mechanism that is disposed on the return side of the water-permeable sheet and on the outer peripheral side of the circulation path of the water-permeable sheet. And a deposit that is disposed in an internal space of the hollow body and directed toward the slit. A cleaning liquid supply connected in communication with the injection pipe via a cleaning liquid supply pipe and a suction pump for removing the deposit and a suction pump connected to the internal space of the hollow body through the injection pipe formed with the suction pipe And a deposit removing mechanism arranged so that the slit opening edge of the hollow body is slidable on the surface of the water permeable sheet. An endless permeable belt stretched between the first head pulley and the first tail pulley, the water permeable belt in a predetermined conveyance section so that the conveyance speed is equal to the conveyance speed of the water permeable belt An endless water-permeable sheet that is stretched over the second head pulley and the second tail pulley so as to be superimposed on the surface of the conductive belt, and an object placed on the water-permeable sheet in the transport section A suction mechanism that sucks and removes water through the water-permeable sheet and the water-permeable belt, and a deposit removal mechanism that is disposed on the return side of the water-permeable sheet and on the outer peripheral side of the circulation path of the water-permeable sheet. A dehydration mechanism comprising:
Arranged above the dewatering mechanism, the circulation path is opposite to the circulation path of the water permeable belt and the water permeable sheet, and the circulation speed is equal to the conveyance speed of the water permeable belt and the water permeable sheet. An endless pressure belt stretched between the third head pulley and the third tail pulley, and the pressure belt is separated from the surface of the water-permeable sheet in the conveying section by a predetermined distance. A pressure mechanism comprising a pair of travel angle adjustment rollers for adjusting the travel angle of the pressure belt, and a pressure roller disposed between the pair of travel angle adjustment rollers;
The adhering matter removing mechanism includes a hollow body in which a slit facing the surface of the water-permeable sheet is formed, an injection pipe provided in an inner space of the hollow body and having an ejection hole directed to the slit, and an adhering matter. The hollow body is configured by a suction pump for removing deposits that is connected to the internal space of the hollow body via a suction pipe for removal, and a cleaning liquid supply means that is connected to the jet pipe via a cleaning liquid supply pipe. The debris removing mechanism is characterized in that the deposit removing mechanism is arranged so that the slit opening edge of the sheet is slidable on the surface of the water-permeable sheet. The dehydrating apparatus according to claim 2, wherein a reaction force member is disposed on the back side of the water permeable belt so as to be slidable with the back surface of the water permeable belt. The dehydrating apparatus according to claim 2, wherein a water absorbing material is provided on a surface of the pressure belt. The suction mechanism includes a suction pump, a suction pipe connected to the suction pump, and a suction member that is connected to the suction pipe and has a reduced pressure space formed therein, along the opening edge of the suction member. The dehydrating apparatus according to claim 1 or 2, wherein an airtight seal is attached, and the suction member is arranged so that the airtight seal is slidable on the back surface of the water-permeable belt. 6. A drainage groove is formed on a surface of the water permeable belt, a drainage hole is formed on a bottom surface of the drainage groove, and the suction member is disposed so that the drainage hole communicates with a decompression space of the suction member. Dehydration apparatus as described. The dehydrating apparatus according to claim 1 or 2, wherein the second head pulley is also used as the first head pulley. The dehydrating apparatus according to claim 1, wherein a vibration applying mechanism that applies vibration to the object is disposed on a back side of the water-permeable belt.

Images