JP4954184B2 - Position adjustment mechanism of eccentric shaft in screw type filter dehydrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position adjustment mechanism for an eccentric shaft disposed in a compact and low cost screw type filtration dehydrator that exhibits a stable dehydration capacity by virtue of a prolonged function of restoring its filtration gaps without frequently changing its movable plates, is excellent in maintainability, and has a long life. <P>SOLUTION: The screw-type filtration dehydrator is constructed in the following manner. A front end opening of a cylindrical filter 1 is provided as a sludge feed port 3 and a terminal end opening thereof is provided as a discharge port 12 for discharging dehydrated cake. A screw conveyor 5 is fitted into the center hole 4 of the cylindrical filter 1. A plurality of movable plates 1KA are each made to have an inner diameter greater than the outer diameter of the conveyer 5. In the section of the cylindrical filter 1 wherein the plurality of movable plates 1KA are disposed without contacting the outer diameter of the conveyer 5, an eccentric shaft 11 is protrudingly disposed on the inner end face of a planetary gear 9 which engages with an inner gear 7 and is rotatably attached to a bearing 10 through an oblong attachment hole 8H formed in a pressure adjustment valve 8 so as to pass through a plurality of notches 5H formed on the flight of the conveyer 5 disposed in the cylindrical filter 1 and to rotate while revolving in the cylindrical filter 1, with the bearing 10 attached onto the outer end face of the pressure adjustment valve 8 in a manner adjustable in the radial direction thereof. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  In the present invention, for example, a suspension containing suspended fine particles generated in a relatively small-scale sewage treatment operation typified by an oxidation ditch method is suspended from filtrate in a low concentration state without passing through a concentration step. The present invention relates to a position adjusting mechanism for an eccentric shaft in a screw-type filter dehydrator for separating turbid particles.

  In the conventional screw-type filter dehydrator, a filter body 5 is formed which is composed of an alternating superposed arrangement of a large number of annular filtration plates 6 (corresponding to a fixed plate) and a large number of annular movable plates 7 with minute filtration gaps. The screw 21 penetrating the entire length of the filter body is disposed, and the outer diameter of the screw 21 is smaller than the inner diameter of the annular filter 6 and the movable plate 7 so that the outer periphery of the screw 21 does not contact the inner periphery of the annular filter 6 and the movable plate 7. The movable plate 7 is set to be non-contact, and the movable plate 7 is formed to be slightly thinner than the spacer 8, and is formed into seat-like shapes 13 and 14 that protrude upward and downward from the outer periphery of the movable plate 7 shown in FIG. Fine holes of the filtration plate 6 formed by the spacer 8 by engaging the drilled holes 15 and 16 with a support rod 17 and a rotary shaft 18 provided through the filtration plate 6. And it is supported by the. Further, as shown in FIG. 1, a key 19 inscribed in the idler hole 16 is formed on the side surface of the rotary shaft 18 over the entire length, and one end of the rotary shaft 18 is provided on the shaft end side of the screw 21. A gear 20 that meshes with the gear and rotates the rotary shaft 18 is provided, and a key 19 attached to the rotary shaft 18 rotates in the idler hole 16, so that the movable plate 7 swings in small steps. It will be. The portion of the filtration plate 6 through which the rotary shaft 18 passes is provided with a through-hole having a diameter larger than that of the rotary shaft 18 as shown in FIG. 3, so that the rotary shaft 18 is free without swinging the filtration plate 6. A screw-type filtration and dehydration apparatus configured to be able to rotate in a rotating manner (see, for example, Patent Document 1) is known.

  However, in the configuration of Patent Document 1, transmission driving is performed by meshing interlocking between a gear provided on the shaft end side of the screw 21 at one end of the rotation shaft 18 and a flat gear of the external gear of the gear 20 that rotates the rotation shaft 18. Because of the method, the distance between the shafts of the screw 21 and the rotary shaft 18 is inevitably determined by the sum of the pitch radii of the flat gears of the external teeth that mesh with each other. Since it cannot be adjusted, it is engaged with the support rod 17 inserted through the upper floating hole 15 formed in the seat-like 13, 14 projecting from the upper and lower portions of the outer periphery of the movable plate 7. The movable plate 7 is oscillated and driven in small increments in the entire vertical and horizontal directions by the eccentric movement caused by the rotational sliding of the key 16 attached to the rotary shaft 18 inserted in the lower floating hole 16. As a matter of course, the support rod 17 Compared to the inner periphery of the floating hole 15, the inner periphery of the floating hole 16 having a very small sliding area is worn out in a short time by the rotational sliding of the key 16 on the driving side, and is brought into a non-contact state with the key 16. Therefore, in particular, in the part where the suspended fine particles are compactly filled in the central hole portion 9 of the filter body 5 toward the discharge port 3 of the suspended fine particles by the conveying and pressing action of the screw 21, the movable plate 7 is filled. The inner pressure acts evenly in the radial direction over the entire inner circumferential surface of the inner circumference, so that the center of the movable plate 7 acts in the centripetal direction so as to overlap the axis of the screw 21, whereas the floating hole 16 In a normal state in which the inner circumference is not worn, the movable plate 7 is eccentrically slid by the eccentricity of the floating hole 16 by the amount of eccentricity of the key 16, so that the key 16 is eccentrically swung. The inner circumference of the floating hole 16 by an eccentric amount of When worn, the key 16 is brought into a non-sliding contact state, and the center of the movable plate is centered on the axis of the screw 21 by the centripetal action of the internal pressure in addition to the engagement of the support rod 17 and the floating hole 15. By overlapping the position, the movable plate will not oscillate eccentrically, so unless the movable plate is frequently replaced, the dewatering performance will be reduced in a short time and a high filtration slit regeneration function cannot be expected. There is a problem that the running cost required for the maintenance and management of the screw type filter dehydrator increases.

  In addition, it is necessary that the large spur gear fitted to the main shaft of the screw 21 and the spur gear 20 fitted to the rotary shaft 18 are engaged with each other to drive the transmission or inevitably in the outer circumferential direction. It becomes a large screw-type filtration and dewatering device, and the above-mentioned both spur gears require precise meshing and assembly, requiring a lot of time and skill to assemble the device, and the spur gear itself is also an expensive part As a result, the production cost increases, and there are also problems of poor assembly and maintenance.

Japanese Examined Patent Publication No. 63-65364 (Left column, page 2, line 9-line 41, Fig. 1-4)

  The problem to be solved is to eliminate the above-mentioned problems by the configuration described in Patent Document 1 of the above-mentioned conventional device and to adjust the mounting position of the eccentric shaft without frequently replacing the movable plate, Providing stable dewatering performance with a long-term filtration slit regeneration function, providing an eccentric shaft position adjustment mechanism for a long-life screw-type filter dewatering device that is compact and excellent in maintainability. The purpose is to do.

  In order to achieve the above object, the present invention is configured as follows.

  According to the first aspect of the present invention, a large number of fixed plates are arranged in a stacked form while maintaining a predetermined interval, and a large number of movable plates that can be eccentrically rotated between the respective stacked layers of the fixed plates are arranged in an alternately superposed arrangement. It is loosely fitted to form a cylindrical filter body with a slit between each of the fixed and movable plates as a drainage drainage groove. The starting end opening of the filter body is used as a sludge inlet, and the end opening is dewatered. A pressure regulating valve facing the annular valve seat at the end opening as a cake delivery port is attached to the screw shaft in a wide and narrow manner, a screw conveyor is fitted into the center hole of the filter body, and the inner diameter of the movable plate is set to the screw conveyor. A state in which a plurality of pins are arranged in a circle on the outer end surface of the annular valve seat in a portion of the screw type filtration dewatering device set so as not to come into contact with the outer diameter of the screw conveyor. The planetary gear meshing with the internal gear is formed by mounting the planetary gear through the elongated slot for mounting the planetary gear formed in the radial elongated hole. By the outer edge of the eccentric shaft that is projected on the inner end surface of the planetary gear rotatably attached to the end surface and inserted through the notch of the screw conveyor in the filter body by a bearing attached to the end surface so that the mounting position can be adjusted in the radial direction. An eccentric shaft position adjusting mechanism configured to slide in contact with the inner peripheral edge of the movable plate and rotate eccentrically is provided.

  The invention according to claim 2 is characterized in that, in the eccentric shaft position adjusting mechanism in the screw type filtration dewatering device according to claim 1, the eccentric shaft for eccentrically rotating the movable plate is constituted by a cam body. To do.

  According to a third aspect of the present invention, in the eccentric shaft position adjusting mechanism in the screw type filtration dewatering device according to the first aspect, the eccentric shaft for eccentrically rotating the movable plate is formed of a helical body. Is.

  According to the first aspect of the present invention, the inner diameter of the movable plate is larger than the outer diameter of the screw conveyor, and the screw-type filter dehydrator is set so as not to contact the outer diameter of the screw conveyor. A plurality of pins are arranged in a circular arrangement on the outer end surface to form an internal gear, and a planetary gear that meshes with the internal gear is attached to a planetary gear that is formed in a radial long hole in a pressure regulating valve. The screw conveyor in the filter body is projected on the inner end face of the planetary gear rotatably mounted by a bearing attached to the outer end face of the pressure regulating valve through the long hole for adjustment in the radial direction. The planetary gear and the inner end face thereof are provided with a mechanism for adjusting the position of the eccentric shaft so that the outer peripheral edge of the movable plate is slidably contacted and rotated eccentrically by the outer edge of the eccentric shaft inserted through the notch of the planetary gear. As the eccentric shaft rotates and revolves in synchronism with the rotation of the screw conveyor, the inner edge of each movable plate is eccentrically driven in the radial direction of 360 degrees around the circumference. Will wear out and will be in a non-sliding contact state with the eccentric shaft, so that the dewatered cake will be compressed into a consolidated and solidified state in the center hole of the filter body, especially toward the delivery port of the dewatered cake by the conveying and pressing action of the screw conveyor In this region, the inner pressure acts evenly in the radial direction over the entire inner peripheral surface of the movable plate, so that the center of the movable plate acts in the centripetal direction so as to overlap the axis of the screw shaft, and the eccentric shaft and Even when the inner edge of the movable plate is in a non-sliding state, it is mounted radially on the outer end face of the pressure regulating valve through the planetary gear mounting elongated hole formed in the radial elongated hole in the pressure regulating valve. Place By adjusting and mounting the bearing attached to the outer position, the eccentric shaft outer edge is again slidably contacted with the inner edge of the movable plate, so that the movable plate can be rotated eccentrically without replacing the movable plate. In addition, the sliding area is ensured by a uniform eccentric sliding over the entire inner periphery of the movable plate by the rotation and revolution of the eccentric shaft. It has an effect that the reproduction function is performed stably.

  Further, as a secondary effect, the dehydrated product that has become compacted is revolved in synchronism with the rotation of the screw conveyor while the planetary gear and the eccentric shaft protruding from the inner end surface of the planetary gear rotate. The filter body is conveyed while being unraveled over the entire 360 ° circumference, and then the planetary gear interposed between the end opening gaps between the opposed surfaces of the annular valve seat and the pressure regulating valve further removes dehydrated matter. While scraping while cutting, the fibrous foreign matter contained in the dehydrated product is cut, so that the dehydrated product is smoothly and smoothly discharged while preventing the clogging of the terminal opening gap, and the conveyance load power of the screw conveyor is kept low, It has the advantage that it can be set as a compact structure in the outer periphery direction.

  In addition to the effect of claim 1, the invention of claim 2 is characterized in that the eccentric shaft for eccentrically rotating the movable plate is constituted by a cam body, so that it is easy to manufacture with a simple structure and Eccentric assembly adjustment is easy, and there is an advantage in productivity and maintenance without increasing the cost.

  In addition to the effect of claim 1, the invention of claim 3 is characterized in that the eccentric shaft for eccentrically rotating the movable plate is formed of a spiral body, and therefore the sliding contact edge of each movable plate is the spiral outer peripheral edge of the spiral body. By subjecting to each swivel sliding contact position and being sequentially slidably contacted, each movable plate is rotated eccentrically while being sequentially subject to the previous movable plate eccentric direction. Since there is also an eccentric movable plate, all the movable plates are not eccentrically rotated in the same eccentric direction at the same time, so that each movable plate can be eccentrically rotated with an eccentric shaft with a small driving force. ing.

  And since the propulsion direction by the rotation of the spiral is opposite to the propulsion direction of the screw conveyor in the direction of the terminal opening of the filter body as shown in FIG. 2, the object to be dehydrated from the notch of the screw conveyor through which the spiral is inserted. 4 is about to leak in the forward discharge direction, but the inner peripheral edge of each movable plate by rotation of the spiral as shown in FIG. 4 while preventing leakage of the dehydration object from the notch due to the opposing propulsion action by the spiral. Is subject to rotation and sliding contact positions on the outer peripheral edge of the spiral body in turn and eccentrically rotates, but the spiral body revolves within the filter body, so that the entire circumference of the filter body is between the inner periphery of the fixed plate and the outer periphery of the screw conveyor. The inner peripheral edge of the movable plate enters and exits the annular gap, and this is coupled with the action that prevents the dehydration target from leaking from the annular gap in the forward discharge direction. Object has an effect that it is possible to sufficiently squeezed and dewatered.

  A large number of fixed plates are arranged in a stacked manner while maintaining a required interval, and a large number of movable plates that can be eccentrically rotated between the respective stacked layers of the fixed plates are loosely fitted in an alternating superposed array to fix and move the above. Is formed in a cylindrical filter body having a slit between each plate as a drainage groove, the start opening of the filter body is used as a sludge inlet, and the end opening is used as a dewatered cake outlet. A pressure regulating valve facing the annular valve seat is mounted on the screw shaft in a wide and narrow manner, a screw conveyor is fitted in the center hole of the filter body, and the inner diameter of the movable plate is larger than the outer diameter of the screw conveyor. In the part of the screw type filtration dewatering device set so as not to contact the outer diameter of the screw conveyor, a plurality of pins are arranged in a circular arrangement on the outer end surface of the annular valve seat to form an internal gear. The mounting position of the planetary gear meshing with the internal gear is adjusted radially to the outer end surface of the pressure adjusting valve through the long slot for mounting the planetary gear formed in the radial adjusting hole in the pressure adjusting valve. The outer peripheral edge of the movable plate is slidably contacted by the outer edge of the eccentric shaft that is projected from the inner end face of the planetary gear rotatably mounted by a bearing attached thereto and inserted into the notch of the screw conveyor in the filter body. A mechanism for adjusting the position of the eccentric shaft configured to rotate is provided.

  1 to 6, reference numeral 1 denotes a cylindrical filter body, which is wider than the thickness of the movable plate 1KA between a large number of fixed plates 1KO and 1KO by a frame 1F of the filter body 1 having a large opening. A plurality of movable plates 1KA,... 1KA, which can be eccentrically rotated between the respective stacked layers of the fixed plate 1KO, are arranged in an overlapping manner. Is formed in a cylindrical filter body 1 having a slit between the fixed plate 1KO and the movable plate 1KA as a drainage outlet groove 2... 2 and sludge is fed into the opening at the start end of the filter body 1. A set bolt 14 provided at the boss portion of the pressure regulating valve 8 facing the annular valve seat 6 of the terminal opening, with the terminal opening 3 serving as a dewatering cake delivery port 12 or a pressure adjusting valve (not shown). 8 Press the back edge The pressure adjusting valve 8 is mounted on the screw shaft 5S by a pressure adjusting spring or the like, and the screw conveyor 5 is fitted into the center hole 4 of the filter body 1 so that the inner diameter of the movable plate 1KA is outside the screw conveyor 5. As a part of the screw type filtration dewatering device set so as not to come into contact with the outer diameter of the screw conveyor 5, for example, in the latter half part on the discharge side of the filter body 1 or the part over the entire length, the prime mover 15 The screw conveyor 5 is driven by the above, and a plurality of pins are arranged in a circular arrangement on the outer end surface of the annular valve seat 6 to form an internal gear 7, and a planetary gear 9 meshing with the internal gear 7 is formed. The mounting position of the bearing 10 can be adjusted in the radial direction on the outer end face of the pressure adjusting valve 8 through the mounting long hole 8H of the planetary gear 9 formed in the radial adjusting hole 8H in the pressure adjusting valve 8. Take The filter body 1 is protruded from the inner end surface of the planetary gear 9 rotatably mounted by a bearing 10 screwed and fastened to the outer end surface of the pressure regulating valve 8 by a mounting bolt 10S inserted through the elongated hole 10H. The eccentric shaft 11 inserted through the notch 5H of the inner screw conveyor 5 rotates the pressure adjusting valve 8 by the rotation of the screw shaft 5S, so that the planetary gear 9 meshing with the inner gear 7 is connected to the annular valve seat 6. Since the shaft 11 is revolved while rotating between the opposing surfaces of the planetary gear 9, the eccentric shaft 11 protruding from the inner end surface of the planetary gear 9 is revolved while rotating in the filter body 1. The dehydrated product squeezed into a solidified state is caused by the planetary gear 9 interposed between the opposed surfaces of the annular valve seat and the pressure regulating valve by the rotation and revolution of the planetary gear 9 shown in FIGS. Cutting the fibrous foreign matter contained in the dehydrated product In addition, the movable plate 1KA... 1KA is oscillated and driven to rotate eccentrically while rotating and revolving the eccentric shaft 11 while releasing the dehydrated material over the entire circumference of the filter body 1 by 360 degrees. .

  Assuming the configuration of the first embodiment, as shown in FIGS. 5 and 6, an eccentric shaft 11 that eccentrically rotates the movable plate 1KA is formed in the cam body 11K, and is projected in the center hole 4 of the filter body 1. The cam body 11K is inserted into the notch 5H of the screw conveyor 5 and rotates while revolving within the filter body 1, so that the outer edge of the cam body 11K is in sliding contact with the inner periphery of the movable plate 1KA, Each movable plate 1KA... 1KA is oscillated and driven to rotate eccentrically over the entire circumference of 360 degrees.

  Assuming the configuration of the first embodiment, as shown in FIGS. 1 and 4, an eccentric shaft 11 that eccentrically rotates the movable plate 1KA is formed in the spiral body 11R and is projected in the center hole 4 of the filter body 1. Further, the spiral body 11R is inserted into the notch 5H of the screw conveyor 5 and rotates while revolving within the filter body 1, so that the outer peripheral edge of the spiral body 11R is in sliding contact with the inner peripheral edge of the movable plate 1KA, and 360 degrees in the filter body 1 is obtained. The movable plates 1KA... 1KA are sequentially swung over the entire circumference to be driven to rotate eccentrically.

It is the vertical side view which showed schematically the structure of the position adjustment mechanism of the eccentric shaft in the screw type filtration dehydration apparatus of Example 1 of this invention. FIG. 2 is an enlarged view of a main part showing engagement of an internal gear and a planetary gear as viewed from the outer end surface direction of the pressure regulating valve of FIG. It is the principal part enlarged view which expanded and displayed the detail j part of FIG. It is a principal part longitudinal cross-sectional enlarged view of the delivery opening part of the dewatering cake of FIG. It is the vertical side view which showed schematically the structure of the position adjustment mechanism of the eccentric shaft in the screw type filtration dehydration apparatus of Example 1 of this invention. It is a principal part longitudinal cross-sectional enlarged view of the delivery opening part of the dewatering cake of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter body 1KA Movable plate 1KO Fixed plate 2 Filtrate outflow groove 3 Sludge feed-in port 4 Center hole 5 Screw conveyor 5H Screw conveyor notch 5S Screw shaft 6 Annular valve seat 7 Internal gear 8 Pressure adjustment valve 8H Planetary gear installation length Hole 9 Planetary gear 10 Bearing 11 Eccentric shaft 11K Cam body 11R Spiral body 12 Dewatered cake delivery port

Claims (3)

  A large number of fixed plates are arranged in a stacked manner while maintaining a required interval, and a large number of movable plates that can be eccentrically rotated between the respective stacked layers of the fixed plates are loosely fitted in an alternating superposed array to fix and move the above. Is formed in a cylindrical filter body having a slit between each plate as a drainage groove, the start opening of the filter body is used as a sludge inlet, and the end opening is used as a dewatered cake outlet. A pressure regulating valve facing the annular valve seat is mounted on the screw shaft in a wide and narrow manner, a screw conveyor is fitted in the center hole of the filter body, and the inner diameter of the movable plate is larger than the outer diameter of the screw conveyor. In the part of the screw type filtration dewatering device set so as not to contact the outer diameter of the screw conveyor, a plurality of pins are arranged in a circular arrangement on the outer end surface of the annular valve seat to form an internal gear. The mounting position of the planetary gear meshing with the internal gear is adjusted radially to the outer end surface of the pressure adjusting valve through the long slot for mounting the planetary gear formed in the radial adjusting hole in the pressure adjusting valve. The outer peripheral edge of the movable plate is slidably contacted by the outer edge of the eccentric shaft that is projected from the inner end face of the planetary gear rotatably mounted by a bearing attached thereto and inserted into the notch of the screw conveyor in the filter body. An eccentric shaft position adjusting mechanism in the screw type filtration dehydrator, comprising the eccentric shaft position adjusting mechanism configured to rotate.   The eccentric shaft position adjusting mechanism in the screw type filtration dehydrator according to claim 1, wherein an eccentric shaft for eccentrically rotating the movable plate is constituted by a cam body.   The eccentric shaft position adjusting mechanism of the screw type filtration dehydrator according to claim 1, wherein an eccentric shaft for eccentrically rotating the movable plate is formed of a spiral body.

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