JP2013059781A - Laminated disk type screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a high-strength wedge wire screen to a pressing element of a screw press to allow compression and dehydration (deoiling).SOLUTION: Annular or non-annular screen forming members 48a-48d having a wedge cross-sectional portion 47 on an inner peripheral part with which raw material makes contact and annular inclusion members 49a-49d are alternately laminated, and a gap 50 is provided between the adjacent screen forming members 48a-48d. In addition, a cut-out discharge part 51 communicating with the gap 50 is provided on the outer peripheral parts of the screen forming members 48a-48d.

Description

  The present invention relates to a disk laminated screen for application to a screw press squeezing machine used for dehydration of hydrate, dehydration of raw material with high water content, squeezing of vegetable oil represented by rapeseed oil, and the like.

  Since the screw press press is mainly used for hydraulic press, it has a very robust structure. As shown in FIG. 9, the raw material charged from the inlet nozzle 24 is conveyed to the outlet chute 32 side by the worm screws 12 and 13 along with the rotation of the screw. In the conveying process, since the gap between the worm screw 13 and the cross rails 27 and 28 is gradually narrowed, the raw material is dehydrated (deoiled) as it is transferred.

  The crosspieces 26, 27, and 28 having a plate structure are assembled with respect to the worm screws 12 and 13 in a cylindrical arrangement. Four slits (width 0.1 to 0.4 mm, length 12.5 mm) are provided at the side ends of the horizontal rails 26, 27, and 28, and water or oil is squeezed and discharged from the slits. .

  Furthermore, the raw material is most compressed in the narrowest part (squeezing part) composed of the driven side plate 2, the adjustment plate 4, the worm screw 13, and the outlet side sleeve 17, and the desired dehydration (deoiling) is performed depending on the position of the adjustment plate 4. ) The rate cake is discharged from the exit chute 32.

  However, it has been impossible from the viewpoint of screen strength to secure a dehydration (deoiling) route in the narrowest part. It is well known that wedge wire screens are effective in removing only water from gas, solid and water mixed materials such as hydrates. However, the wedge wire screen has a low strength because it is manufactured by a welding combination of a thin wire having a wedge-shaped cross section and a thin rod.

  For this reason, although it was recognized that it was effective for dehydration, the wedge wire type screen could not be applied to a portion where pressure was applied. As an application example of the wedge wire type screen, it is at most about 0.5 MPaG.

  On the other hand, according to the tests so far, a pressure application of about 3 MPaG at maximum is measured in the screw press pressing unit.

  In addition, as a screw press machine, what is used for food processing which squeezes fruit juice, soymilk, etc., or waste processing, such as livestock excrement, vegetable waste, fruit waste, is proposed (for example, refer patent document 1).

JP-A-8-132295

  An object of the present invention is to make it possible to produce a high-quality cake by applying a high-strength wedge wire screen to a pressing part of a screw press press to enable pressing and dehydration (deoiling).

  The disk laminated screen according to claim 1 of the present application is formed by alternately laminating an annular or non-annular screen forming member having a wedge-shaped cross section on an inner peripheral portion with which a raw material contacts and an annular inclusion. A gap is formed between the screen forming members, and a notch-shaped discharge portion communicating with the gap is provided on the outer periphery of the screen forming member.

  The disk laminated screen according to claim 2 of the present application is formed by alternately laminating an annular screen forming member having a wedge-shaped cross-section and an annular or non-annular inclusion on an inner peripheral portion in contact with a raw material. A gap is formed between the screen forming members, and the inner diameter of the inclusion is made larger than the inner diameter of the screen forming member.

  The disk laminated screen according to claim 3 of the present application is formed by alternately laminating annular screen forming members having a wedge-shaped cross-section and inner or annular inclusions on the inner peripheral portion with which the raw material contacts. A gap is formed between the screen forming members, and the gap formed between the adjacent screen forming members is arbitrarily adjusted by changing the thickness of the inclusions.

  As described above, the present invention relates to the screen forming members adjacent to each other by alternately laminating the annular or non-annular screen forming members and the annular inclusions having a wedge-shaped section in the inner peripheral portion where the raw material contacts. Since a gap is formed between them, and a notch-shaped discharge portion communicating with the gap is provided in the outer peripheral portion of the screen forming member, it becomes possible to discharge drainage, drainage oil, etc. even in a portion where the pressing pressure is high, Stable and high quality products can be produced.

  High strength due to the simple disc structure of the screen. As a result of the FEM analysis (finite element method analysis), the internal pressure of 5 MPaG did not break.

  Moreover, the space | interval of the clearance gap formed between the adjacent screen formation members can be arbitrarily adjusted by changing the plate | board thickness of inclusions, such as a shim and a spacer.

It is sectional drawing of the screw press pressing machine to which the disk lamination type screen which concerns on this invention is applied. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is a front view of the disk lamination type screen concerning the present invention. It is a principal part enlarged front view containing the partial cross section of the disk lamination type screen which concerns on this invention. It is DD sectional drawing of FIG. It is operation | movement explanatory drawing of the disk lamination type screen which concerns on this invention. It is sectional drawing of the conventional screw press pressing machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a case where the raw material gas hydrate slurry is dehydrated is taken as an example.

  In FIG. 1, the code | symbol 100 is a screw press pressing machine, and the raw material (gas hydrate slurry) a thrown in from the inlet nozzle 24 is conveyed to the exit chute 32 side with rotation of a screw with the worm screws 12-16. In the conveying process, since the gap between the worm screws 13 to 16 and the cross rails 27 and 28 is gradually narrowed, the raw material (gas hydrate slurry) a is dehydrated as it is transferred.

  The crosspieces 27 and 28 having a plate structure are assembled so as to be cylindrically arranged with respect to the rear half portion of the worm screw 12 and 13 to 16, and the outside thereof is held by a cage (structure) 30 (FIG. reference). Four slits 29 (width 0.1 to 0.4 mm, length 12.5 mm) are provided at the side ends of the horizontal bars 27 and 28, and water is squeezed and discharged from the slits 29. In other words, the portions of the horizontal rails 27 and 28 are the solid-liquid separator 36.

  On the other hand, a portion corresponding to the first half portion of the worm screw 12 is a cylindrical wedge wire screen 25. As shown in FIG. 3, the wedge wire screen 25 is formed by arranging a large number of V-shaped cross-section wires 37 in parallel, and has a continuous slot 38 having a narrow entrance and a wide inside. On the outside of the wire 37, there are a number of arc-shaped rods 39 for keeping the spacing of the slots 38 constant, and the intersections of the wire 37 and the rod 39 are welded.

  The worm screw 12 has continuous screw blades, while the worm screws 13, 14, 15, and 16 have single screw blades. One end of the drive shaft 9 to which these worm screws 12 to 16 are attached is held by the bearing lid 7 attached to the upstream end of the cage 1, and the other end is held by the outlet housing 5. The outlet housing 5 is attached to the driven side plate 2 attached to the downstream end of the cage 1 via a cylindrical scale plate 31.

  Reference numeral 33 denotes a tray that receives and discharges the liquid material separated by the wedge wire screen 25, and has a discharge hole at the bottom thereof. Reference numeral 34 denotes a tray that receives and discharges the liquid material separated by the solid-liquid separation unit 36, and has a discharge hole at the bottom thereof.

  As shown in FIG. 1, the cylindrical outlet side sleeve 17 fitted to the downstream end of the drive shaft 9 is pressed against the downstream end of the worm screw 16 by a hexagon nut 40 screwed to the drive shaft 9. .

  The annular adjustment plate 4 provided on the downstream side of the driven plate 2 has a funnel-shaped tip 41 inserted into a through hole provided in the shaft core portion of the driven plate 2. For this reason, when the adjustment plate 4 is moved in the longitudinal direction of the drive shaft 9, it is between the funnel-shaped tip portion 41 of the adjustment plate 4 and the truncated cone-shaped head portion 18 provided at the upstream end of the outlet side sleeve 17. The gap can be adjusted.

  An outlet chute 32 is provided below the scale plate 31, and a seal plate 6 is provided on the second frame body counted from the upstream end of the cage 1. Further, a seal sleeve 11 is provided at the upstream end of the worm screw 12, and the disk laminated screen 45 of the present invention is mounted at the upstream end of the driven side plate 2.

  As shown in FIGS. 5 to 7, the disk laminated screen 45 is composed of a plurality of annular screen forming members 48 a to 48 d each having a wedge-shaped cross section 47 in an inner peripheral portion 46 with which the raw material contacts, and a plurality of circles. Annular inclusions (for example, annular shims or spacers) 49a to 49d are alternately stacked, and a gap 50 formed by the inclusions 49b to 49d is provided between the screen forming members 48a to 48d. ing. Each of the screen forming members 48 a to 48 d is provided with a notch-shaped discharge portion 51 communicating with the gap 50 on the outer peripheral portion thereof.

  A plurality of discharge portions 51 are provided at regular intervals in the circumferential direction of the screen forming members 48a to 48d. The shape of the discharge portion 51 is not limited, but an arc shape or a U shape is desirable for manufacturing. Reference numeral 52 denotes a tightening screw, which is disposed on a protruding portion 53 formed between adjacent discharge portions 51, 51, and integrates the screen forming members 48a to 48d and the inclusions 49a to 49d.

  At that time, in order to make the notch-shaped discharge portions 51 provided on the outer peripheral portions of the screen forming members 48a to 48d communicate with the gap 50 formed between the screen forming members 48a to 48d, annular inclusions 49a to 49d are provided. Is required to be larger than the inner diameter of the annular screen forming members 48a to 48d.

  As shown in FIG. 7, the disk-laminated screen 45 has a smooth inner peripheral portion 46 of a wedge-shaped section 47. In addition, the gap between the two adjacent wedge-shaped sections 47, 47 has a narrow entrance and a wide interior.

  Moreover, the quantity of the screen formation members 48a-48d and the inclusions 49a-49d can be increased / decreased suitably.

  Next, the operation of the screw press press 100 will be described.

  First, the adjustment plate 4 is moved in the longitudinal direction of the drive shaft 9 to adjust the gap between the funnel-shaped tip portion 41 of the adjustment plate 4 and the truncated cone-shaped head portion 18 of the outlet side sleeve 17, and the raw material ( The pressure applied to the gas hydrate slurry a) is adjusted.

  Next, after rotating the worm screws 12 and 13 to 16 mounted on the drive shaft 9 and then introducing the hydrate slurry a as a raw material from the inlet nozzle 24, the hydrate screws a while being transferred downstream by the worm screw 12. A part of the water w contained in the rate slurry a flows down from the slot 38 of the wedge wire screen 25 into the tray 33 and is discharged out of the machine through the discharge hole.

  The partially dehydrated hydrate slurry a is transferred to the downstream side by the worm screws 12 and 13 to 16, and the shaft diameters of the worm screws 13, 14, 15, and 16 gradually increase toward the downstream side. Since the squeezed shaft portion is formed, the water w which is gradually squeezed and squeezed out of the hydrate slurry a flows down into the tray 34 from the slots 29 of the horizontal rails 27 and 28, and from the discharge hole to the outside of the machine. Discharged.

  The hydrate cake a ′ pushed into the disk laminated screen 45 by the worm screw 16 passes between the funnel-shaped tip 41 of the adjustment sleeve 4 and the truncated cone-shaped head 18 of the outlet sleeve 17. It is further squeezed because it is difficult.

  For this reason, as shown in FIG. 8, the water w squeezed from the hydrate cake a ′ passes through the gap 50 between the screen forming members 48 a to 48 d, and then is discharged to the screen forming members 48 a to 48 d. 51 flows out to the outer peripheral side of the disk laminated screen 45. This effluent water w is discharged into the tray 34 already described.

  The hydrate cake a 'that has passed between the front end portion 41 of the adjustment plate 4 and the truncated cone-shaped head portion 18 of the outlet side sleeve 17 is discharged out of the machine from the outlet chute 32.

  In the above description, the case where the annular inclusions 49a to 49d are interposed between the screen forming members 48a to 48d has been described. However, as the inclusions 49a to 49d, non-annular inclusions should be used. You can also. In this case, the gap 50 formed between the screen forming members 48a to 48d also serves as a discharge portion.

  In addition to hydrate press dehydration, the disk laminated screen can be used for dehydration of high moisture content raw materials, vegetable oil represented by rapeseed oil, and the like.

a Raw material 46 Inner peripheral portion 47 Wedge-shaped cross sections 48a to 48d Screen forming members 49a to 49d Inclusions 50 Clearance 51 Discharge portion

Claims (3)

  An annular screen-forming member having a wedge-shaped cross-section and an annular or non-annular inclusion are alternately stacked on the inner periphery of the material in contact with each other to form a gap between adjacent screen-forming members; and 2. A disk laminated screen characterized in that a notch-shaped discharge portion communicating with the gap is provided on an outer peripheral portion of the screen forming member.   An annular screen-forming member having a wedge-shaped cross-section and an annular or non-annular inclusion are alternately stacked on the inner periphery of the material in contact with each other to form a gap between adjacent screen-forming members; and 2. The disk laminated screen according to claim 1, wherein the inclusion has an inner diameter larger than an inner diameter of the screen forming member.   An annular screen-forming member having a wedge-shaped cross-section and an annular or non-annular inclusion are alternately stacked on the inner periphery of the material in contact with each other to form a gap between adjacent screen-forming members; and 3. The disk laminated screen according to claim 1, wherein a gap formed between adjacent screen forming members is arbitrarily adjusted by changing the thickness of the inclusions.

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