JP2016010784A - Centrifugal separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal separator capable of preventing solid matters adhered to the outer surface of a scraper shaft from entering a support part of the scraper shaft when the solid matters accumulated at the inner periphery of a basket are removed by turning and linearly moving a scraper blade attached to the lower end of the scraper shaft inserted into the basket.SOLUTION: A mechanism for moving a scraper blade linearly comprises a male screw part 22 formed at the outer periphery of a scraper shaft 11; a rotary member 41 having a female screw part screwed to the male screw part 22; and a mechanism 42 for rotating the rotary member 41. A cylindrical member 56 rotating integrally with the rotary member 41 is provided so as to concentrically surround a portion near the tip part of the scraper shaft 11. An annular wiper 70 in close contact with the outer periphery of the scraper shaft is fixed to the tip part of the cylindrical member 56. Rotational displacement and linear displacement are generated between the wiper 70 and the scraper shaft 11 when displacing the scraper shaft 11 in an axial direction, and thereby solid matters adhered to the scraper shaft 11 are removed.

Description

  The present invention relates to a centrifuge that separates a stock solution into a liquid component and a solid using a centrifugal force generated by rotation of a basket.

  A centrifuge is widely used as an apparatus for performing a process of separating a stock solution into a liquid component and a solid (crystal).

  As disclosed in Patent Document 1, the centrifuge includes a casing, a basket that is disposed in the casing and is rotatably supported, a basket driving device that rotationally drives the basket, and a stock solution in the basket. A liquid supply device is provided, and the stock solution supplied into the basket is separated into a liquid component and a solid matter by centrifugal force generated by high-speed rotation of the basket. The separated solid matter is deposited inside a filter attached to the inner circumference of the peripheral wall portion of the basket to form a solid matter layer. The separated liquid is discharged out of the basket through the solid layer, the filter, and a large number of perforations provided in the peripheral wall of the basket.

  The centrifuge also includes a solid material scraping device that scrapes off a fixed material layer formed on the inner side of the peripheral wall portion of the basket in order to collect the solid material from the basket. The solid material scraping device is supported by the casing so that the axis is oriented in a direction parallel to the axis of the basket, is rotatable about the center axis, and is displaceable in the direction of the axis of the basket. A scraping shaft whose tip is inserted into the basket through the portion, a swing arm having a rear end fixed to the tip of the scraping shaft, a scraping blade attached to the tip of the swing arm, and a scraping blade An axial drive device that drives the scraping shaft back and forth in the axial direction to linearly move the scraper in the axial direction of the basket, and a rotary drive that rotates the scraping shaft back and forth within a certain angular range to rotate the scraping blade within the basket. An apparatus, and scrapes off the solid matter accumulated on the inner periphery of the basket by a turning motion of the scraping blade and a linear motion along the axial direction.

  When the solid material formed on the inside of the peripheral wall of the basket is scraped by the above-described solid material scraping device, the scraping blade is first placed at the initial position set at the limit position near the opening of the basket. In a state where the basket is rotated at a low speed, the scraping shaft is rotated to rotate the scraping blade toward the peripheral wall of the basket. Thereby, the approach scraping operation | movement which scrapes off a solid substance is performed, making a scraping blade approach into the solid substance layer formed inside the surrounding wall part of a basket. When the scraping blade reaches an entry limit position where the scraping blade comes close to the filter disposed on the inner periphery of the peripheral wall portion of the basket through a slight gap, the turning operation of the scraping blade is stopped. Next, the scraping blade that has entered the entry limit position is linearly moved toward the end opposite to the opening of the basket, and a downward scraping operation is performed to scrape solids. When the final position is reached in the state close to the end (bottom wall) opposite to the end, a turning pull back operation is performed in which the scraping blade is turned to the inner diameter side of the basket and pulled back. Then, the scraping blade is lifted and a pulling back operation is performed for pulling back to the initial position on the opening side of the basket.

  In the centrifuge equipped with the solid material scraping device as described above, if the portion inserted into the basket of the scraping shaft is exposed, the solid material adheres to the outer surface of the scraping shaft and hardens. Sometimes. When the scraping shaft is lifted, if solid matter adhering to the outer surface penetrates into the support portion of the scraping shaft, the bearing metal supporting the scraping shaft is damaged or the scraping shaft is prevented from rising. Or Therefore, in the conventional centrifuge, a bellows is attached so as to completely cover the portion of the scraping shaft inserted into the basket, thereby preventing solid matter from adhering to the outer surface of the scraping shaft.

  However, when the bellows is attached so as to cover the portion of the scraping shaft that is inserted into the basket, the solid matter adheres to the outer surface of the bellows and hardens, so the scraping shaft is raised to contract the bellows. At this time, there is a problem that the solid matter is sandwiched between the folds of the bellows, and if the bellows is further contracted as it is, the bellows is broken.

  In order to prevent such a problem from occurring, in the centrifugal separator disclosed in Patent Document 1, a plurality of wipers arranged in the circumferential direction of the scraping shaft are fixed to a wiper holding frame fixed to a casing housing the basket. Solid matter attached to the outer surface of the scraping shaft by holding the blade and pressing the wiper retaining blade against the outer peripheral surface of the scraping shaft, causing the scraping shaft to perform linear motion and rotational motion. Is wiped off with a wiper blade.

JP 2002-306987 A

  According to the invention described in Patent Document 1, it is possible to remove solid matter attached to the outer periphery of the scraping shaft without covering the scraping shaft with the bellows. However, in the invention described in Patent Document 1, since the wiper blade is fixed to the casing, when removing the solid matter attached to the outer periphery of the scraping shaft, the scraping shaft is moved linearly at the same time. The reciprocating rotational motion in a narrow angle range, which is different from the reciprocating rotational motion during the solid scraping, must be continuously performed.

  In the solid matter scraping device of the centrifuge, when the solid material is scraped off, the linear motion for moving the scraping blade up and down in the basket (linear motion along the axis of the basket) The scraping shaft performs two types of operations, a reciprocating rotation operation for rotating the scraping blade (a rotary motion for rotating the scraping blade to the side of the peripheral wall and the side away from the peripheral wall). However, in the case of the invention described in Patent Document 1, in addition to these operations, a reciprocating rotation operation in a narrow angle range for causing the wiper blade to perform a cleaning operation is used as a scraping shaft. Since it is necessary to carry out continuously, it is inevitable that the structure of the scraping shaft drive device becomes complicated.

  In addition, in the case of the invention disclosed in Patent Document 1, it is necessary to arrange a plurality of wiper blades side by side around the scraping shaft, so that the supporting portion of the scraping shaft is prevented from being enlarged. I couldn't.

  Furthermore, in the case of the invention disclosed in Patent Document 1, when the scraping blade is moved to the opening side of the basket, the scraping blade must be reciprocally swung. There is a possibility that the mechanical load applied to the shaft driving device is increased and the life thereof is shortened.

  Furthermore, in the case of the invention described in Patent Document 1, not only solid matter is easily clogged between a plurality of wiper blades arranged at intervals, but also a wiper holding frame that holds each wiper blade. The solid matter may enter the gap between the wiper blade and the displacement of the wiper blade toward the scraping shaft side may be hindered, making it difficult to maintain a state where the cleaning operation by the wiper blade is performed smoothly and reliably. there were. Further, in the case of the invention described in Patent Document 1, it is easy to completely clean the periphery of the wiper blade having a complicated structure when the inside of the centrifuge is cleaned after the solid-liquid separation process. There was also a problem that it was not.

  The object of the present invention is to cover the outer periphery of the scraping shaft without covering the scraping shaft with a bellows and without causing the scraping shaft to perform an extra operation other than that originally required for scraping off the solid matter. An object of the present invention is to provide a centrifuge capable of reliably removing solid matter adhering to the surface and preventing the solid matter adhering to the scraping shaft from entering the support portion of the scraping shaft.

  The present invention is a basket that is disposed in a casing and is rotatably supported, and an axis is directed in a direction parallel to the axis of the basket, is rotatable about a central axis, and is displaceable in the direction of the axis of the basket. A scraping shaft that is supported by the casing and is inserted into the basket through the opening of the basket, and a swing arm having a rear end fixed to the tip of the scraping shaft, and a swing arm A scraper blade attached to the tip of the basket, an axial drive device for reciprocating the scraper shaft in the axial direction to move the scraper blade linearly in the axial direction of the basket, and for turning the scraper blade in the basket A centrifuge that includes a rotary drive device that reciprocally rotates the scraping shaft within a certain angular range, and scrapes the solid matter accumulated on the inner periphery of the basket by the swirling motion and linear motion of the scraping blade. .

  The rotary drive device used in the present invention includes a guide groove provided on the outer periphery of the scraping shaft so as to extend in the axial direction of the scraping shaft, and a guide portion slidably fitted in the guide groove. A scraping shaft drive member that is coupled to the scraping shaft so as to be able to rotate together with the scraping shaft while allowing displacement along the axial direction of the scraping shaft, and the scraping shaft about the central axis And a drive member drive mechanism for reciprocatingly driving the scraping shaft drive member so as to reciprocate within a certain angle range.

  Further, the axial drive device used in the present invention includes a male screw portion formed on the outer periphery of the scraping shaft, an annular rotating member having an inner screw portion threadedly engaged with the male screw portion, and a scraping member. A rotating member driving mechanism that reciprocally drives the rotating member to reciprocate the shaft in the axial direction.

  In the present invention, there is also provided a cylindrical member that rotates integrally with the rotating member while concentrically surrounding a portion near the tip of the scraping shaft when the scraping shaft is displaced in the axial direction. An annular wiper that is in close contact with the outer periphery of the scraping shaft in a state of surrounding the shaft is fixed to the tip portion of the cylindrical member, and an axial line between the annular wiper and the scraping shaft when the scraping shaft is displaced in the axial direction. By causing a relative displacement comprising a displacement in the direction and a rotational displacement around the axis, a cleaning operation for removing the solid matter adhering to the scraping shaft is performed.

  In order to remove foreign matter adhering to the shaft that performs thrust displacement, it is possible to provide a dust seal on the shaft support and remove the foreign matter adhering to the shaft by the relative axial displacement that occurs between the shaft and the dust seal. It is already widely known. However, when the centrifugal separator is configured so that a dust seal is provided between the scraping shaft and the support portion of the scraping shaft and only an axial displacement is generated between the scraping shaft and the dust seal. Since the solid matter adhered to the scraping shaft may be caught inside the dust seal, it is difficult to completely prevent the solid matter adhered to the scraping shaft from entering the support portion of the scraping shaft.

  On the other hand, as in the present invention, when the scraping shaft is displaced in the axial direction, a relative displacement consisting of a displacement in the axial direction and a rotational displacement about the axis occurs between the annular wiper and the scraping shaft. If configured so that the annular wiper moves the solid matter adhering to the scraping shaft in the axial direction of the scraping shaft and the operation of cutting the solid matter while the annular wiper rotates, the scraping shaft The solid matter attached to the surface of the scraper is removed, so the solid matter can be removed more reliably from the scraping shaft than when only the relative displacement in the axial direction is generated between the wiper and the scraping shaft. Even if the scraping shaft is not covered with the bellows, it is possible to reliably prevent the solid matter from entering the support portion of the scraping shaft.

  Further, as described above, the mechanism for driving the scraping shaft in the axial direction has an annular shape having a male screw portion formed on the outer periphery of the scraping shaft and a female screw portion screwed to the male screw portion on the inner periphery. And a rotating member driving mechanism for reciprocatingly driving the rotating member to reciprocate the scraping shaft in the axial direction, and the tip of the scraping shaft when the scraping shaft is displaced in the axial direction. A cylindrical member that rotates integrally with the rotating member in a state of concentrically surrounding the close portion is provided, and an annular wiper that is in close contact with the outer periphery of the scraping shaft is fixed inside the tip of the cylindrical member. In order to remove the solid matter adhering to the scraping shaft by using a part of the axial drive device that causes the scraping shaft to perform a linear motion along the axial direction in order to scrape the solid matter in the basket. Can be configured to perform the necessary wiper rotation Therefore, it is possible to realize a centrifuge that can prevent the mechanism for driving the scraping shaft and the wiper from becoming complicated, and can eliminate the bellows covering the scraping shaft without increasing the size of the device and increasing the cost. it can.

  As the wiper, it is preferable to use a seal member having at least one annular lip having a wedge-shaped cross section in close contact with the outer peripheral surface of the scraping shaft.

  In a preferred aspect of the present invention, a ceramic cylinder is fitted and fixed to the outer periphery of a portion of the scraping shaft that is inserted into the basket, and the ceramic cylinder forms a part of the scraping shaft. The length of the ceramic cylinder is set so that the wiper is in close contact with the outer circumference of the ceramic cylinder during the entire process of moving in the axial direction.

  As described above, when the ceramic cylinder is fitted to the outer periphery of the portion inserted into the basket of the scraping shaft, the outer periphery of the portion inserted into the basket of the scraping shaft is made of acid-resistant ceramic. Therefore, even if the scraping shaft is not covered with a bellows or the scraping shaft is not formed with an acid-resistant material, it is scraped with acid contained in the solid matter. The axis can be prevented from being attacked.

  In another preferred aspect of the present invention, the casing includes a support frame having a cylindrical shaft support portion that has a cylindrical inner peripheral surface and that has a tip portion facing the inside of the basket inside the casing. Fixed. In this case, the scraping shaft is arranged concentrically with the shaft support portion on the inner side of the shaft support portion of the support frame so as to be rotatable about the central axis and to be displaceable in the axial direction of the basket. Supported by the frame. The cylindrical member is disposed inside the shaft support portion of the support frame and connected to the rotation member so as to rotate together with the rotation member, and the shaft support portion of the inner cylinder and the support frame. An outer cylinder having a cylindrical outer cylinder coupled to the inner cylinder so as to rotate with the inner cylinder in a state of being allowed to displace in the axial direction and disposed between the inner circumferential surface and the inner cylinder The said annular wiper is fixed to the front-end | tip part of a body. In addition, another annular wiper that is in close contact with the outer periphery of the outer cylinder is fixed inside the tip of the shaft support portion of the support frame, and the tip of the outer cylinder is in the process of the scraping shaft entering the basket. Is configured such that the outer cylinder can be displaced to a position that reaches a deeper depth of the basket than the tip of the inner cylinder.

  When configured as described above, the cylindrical member can have a telescope structure, and the cylindrical member can be expanded and contracted following the displacement of the scraping shaft. Can do.

  In a preferred aspect of the present invention, the rotating member of the axial drive mechanism is composed of a worm gear having an inner thread formed on the inner periphery, and the inner thread of the worm gear is the outer periphery of the scraping shaft. Screwed into the male thread. In this case, the rotating member drive mechanism includes a worm meshed with a worm gear and a rotation drive source that rotationally drives the worm.

  In a preferred aspect of the present invention, the drive member drive mechanism for reciprocatingly driving the scraping shaft drive member is disposed at a distance in the axial direction of the scraping shaft, and a pair of grooves integrated with the scraping shaft drive member A lever with a female threaded portion on the inner side, a movable piece disposed between the pair of grooved levers, and a pair of grooves formed on the pair of grooved levers fixed to the movable piece. A pair of pins fitted to each other, a screw rod screwed into an internal thread portion of the movable piece, and a rotational drive source for rotationally driving the screw rod.

  According to the present invention, an annular wiper that is in close contact with the outer periphery of the scraping shaft is attached to the tip of a cylindrical member that is provided so as to surround the scraping shaft, and when the scraping shaft is displaced in the axial direction, the annular wiper and the scraper are disposed. A relative displacement consisting of a displacement in the axial direction between the shaft and a rotational displacement around the shaft, causing the annular wiper to push away solid matter adhering to the scraping shaft in the axial direction of the scraping shaft. In addition to removing the solid matter adhering to the scraping shaft while rotating the annular wiper and cutting the solid matter, the relative displacement in the axial direction between the wiper and the drive shaft Compared with the case of generating only the solid matter, it is possible to more reliably remove the solid matter from the scraping shaft, and even if the scraping shaft is not covered with the bellows, the solid matter enters the support portion of the scraping shaft. Can be surely prevented.

  According to the present invention, the mechanism for driving the scraping shaft in the axial direction has a male screw portion formed on the outer periphery of the scraping shaft and a female screw portion screwed to the male screw portion on the inner periphery. It is composed of an annular rotating member and a rotating member drive mechanism that reciprocally drives the rotating member to reciprocate the scraping shaft in the axial direction, and the tip of the scraping shaft when the scraping shaft is displaced in the axial direction. Since a cylindrical member that rotates integrally with the rotating member in a state of concentrically surrounding the portion near the portion is provided, and the annular wiper that is in close contact with the outer periphery of the scraping shaft is fixed to the tip of the cylindrical member, Necessary to remove the solid matter attached to the scraping shaft by using a part of the axial drive device that makes the scraping shaft perform a linear motion along the axial direction in order to scrape the solid matter in the basket. A mechanism for rotating the wiper can be configured. Accordingly, it is possible to realize a centrifugal separator that can prevent the scraping shaft and the mechanism for driving the wiper from becoming complicated, and can eliminate the bellows covering the scraping shaft without increasing the size of the device and increasing the cost. it can.

  Further, in the present invention, when the ceramic cylinder is fitted and fixed to the outer periphery of the portion closer to the tip than the portion where the male thread portion of the scraping shaft is provided, Since the outer periphery of the inserted part is covered with acid-resistant ceramic, the part to be inserted into the basket of the scraping shaft is covered with a bellows, or the scraping shaft is formed of an acid-resistant material. Even if not, the scraping shaft can be prevented from being attacked by the acid contained in the solid.

It is a longitudinal cross-sectional view of the centrifuge which concerns on one Embodiment of this invention. It is a top view of the centrifuge shown in FIG. It is the top view which showed a part of structure of the principal part of the solid substance scraping apparatus used with the centrifuge shown in FIG. It is the longitudinal cross-sectional view which showed the structure of the principal part of the scraping shaft drive device used with the centrifuge which concerns on one Embodiment of this invention. FIG. 5 is a longitudinal sectional view showing a state in which the scraping blade is in an upper limit position in the scraping shaft driving device shown in FIG. 4. FIG. 5 is a longitudinal sectional view showing a state in which the scraping blade is displaced to an intermediate position in the scraping shaft driving device shown in FIG. 4. FIG. 5 is a longitudinal sectional view showing a state in which the scraping blade has reached the lower limit position in the scraping shaft driving device shown in FIG. 4. It is sectional drawing which showed the structure of the front-end | tip part vicinity of the cylindrical member surrounding a scraping axis | shaft in the centrifuge which concerns on one Embodiment of this invention. It is sectional drawing which showed an example of the structure of the wiper fixed inside the front-end | tip part of the cylindrical member shown by FIG. It is the longitudinal cross-sectional view which showed the structure of the principal part of other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention can be applied to either a vertical centrifuge in which the axis of the basket is arranged in the vertical direction and a horizontal centrifuge in which the axis of the basket is arranged in the horizontal direction or in a direction inclined with respect to the horizontal direction. However, in the following description, the present invention will be described with reference to an example in which the present invention is applied to a vertical centrifuge.

  1 and 2 show an overall configuration of a centrifuge according to an embodiment of the present invention. In these drawings, 1 is a casing of the centrifuge. The casing 1 is attached to the upper end of the casing main body 101 via a hinge 102 with a central axis line oriented in the vertical direction, and can be opened and closed to close the opening at the upper end of the main body 101. And a cover plate 103. The casing 1 is supported on the installation base 3 by three support devices 2 that are provided with shock absorbing means and are arranged at equiangular (120 °) intervals. The cover plate 103 of the casing can be fixed to the main body 101 by fastening means 104 (see FIG. 2) such as a bolt with the upper end opening of the casing main body 101 closed.

  A cage basket 4 is accommodated in the casing 1 with its central axis oriented in the vertical direction. The basket 4 has a cylindrical peripheral wall 401 having an infinite number of transmission holes (not shown), and an annular end plate attached to one end in the axial direction of the peripheral wall (in this embodiment, the upper end of the peripheral wall). 402 and a bottom plate 403 attached to the other axial end of the peripheral wall 401 (in this embodiment, the lower end of the peripheral wall), and the inner side of the end plate 402 is located on the upper end of the basket. It is an opening 4a.

  A solid material discharge port 405 having a cylindrical wall 404 sharing the central axis with the peripheral wall 401 is formed at the center of the bottom plate 403 of the basket, and the central axis is shared with the peripheral wall 401 at the central part of the basket. One end (the lower end in the present embodiment) of the rotating shaft 406 arranged in (1) is fixed to the cylindrical wall 404 of the solid material discharge port via a plurality of radially arranged ribs 407. The rotating shaft 406 is rotatably supported by a bearing device 5 attached to the casing lid 103. At one end in the axial direction of the bearing device 5 (upper end in the present embodiment), a basket driving device 6 that rotates the rotating shaft 406 using the electric motor 601 as a driving source is attached. Although not shown, a filter made of a filter cloth, a wire mesh, a perforated plate, or the like is attached to the inside of the peripheral wall 401 of the basket 4.

  The lid plate 103 of the casing 1 is provided with a liquid supply pipe 7 for supplying the stock solution into the basket and a cleaning liquid supply pipe 8 for supplying the cleaning liquid into the basket, and is formed inside the peripheral wall 401 of the basket. A solid material scraping device 10 for scraping the solid material is attached. In the illustrated example, a window 105 for observing the inside of the basket 4 is provided on the cover plate 103 of the casing.

  The solid material scraping device 10 is a device that scrapes the solid material to recover the solid material formed inside the peripheral wall 401 of the basket by solid-liquid separation processing. The solid scraping device 10 shown in the figure is oriented in a direction parallel to the axis of the basket 4 (vertical direction in the present embodiment), is rotatable about the central axis, and is displaced in the axis of the basket 4 A scraping shaft 11 that is supported by the lid plate 103 of the casing 1 in a possible state and a portion near the leading end is inserted into the basket 4 through the opening 4 a of the basket 4, and a rear end at the leading end of the scraping shaft 11 And a scraping blade 13 attached to the tip of the swing arm 12, and a scraping shaft drive device 15 that drives the scraping shaft 11. In the illustrated example, a boss portion 12 a is provided at the rear end portion of the swing arm 12, and the boss portion 12 a is fitted and fixed to the lower end of the scraping shaft 11. It is fixed to the tip (lower end) of the scraping shaft 11.

  The scraping shaft drive device 15 includes an axial direction drive device that drives the scraping shaft 11 back and forth in the axial direction to move the scraping blade 13 back and forth in the axial direction of the basket 4, and the scraping blade 13 within the basket 4. A rotary drive device for reciprocatingly rotating the scraping shaft 11 in a certain angular range for rotation, and linear motion and swiveling motion of the scraping blade 13 generated by linear movement and rotational motion of the scraping shaft 11, respectively. Thus, the solid matter accumulated inside the basket 4 is scraped off and dropped onto the bottom plate 403 of the basket. The scraper blade 13 is attached with a guide plate 16 that moves the solid matter scraped off and dropped onto the bottom plate 403 of the basket to the solid matter discharge port 405 side. The guide plate 16 is placed on the bottom plate 403 of the basket. By turning, the solid on the bottom plate 403 can be moved to the solid discharge port 405 side.

  An annular solid material guide duct 106 concentrically surrounding the cylindrical wall 404 of the solid material discharge port 405 of the basket 4 is attached to the central portion of the bottom plate 105 of the casing 1 and falls through the solid material discharge port 405 of the basket. The solid matter is collected through a duct 106 into a solid matter collection container (not shown).

  3 and 4 show in detail the structure of the main part of the scraping shaft driving device used in the present embodiment. In the present embodiment, the cylindrical portion 20a that penetrates the through hole 103a provided in the lid plate 103 of the casing 1 and the upper surface of the lid plate 103 that is provided at one end in the axial direction of the cylindrical portion are attached via packing. A first frame structure 20 integrally having a contacted flange 20b is provided, a second frame structure 21 is disposed on the flange 20b of the first frame structure 20, and the first The frame structure 20 and the second frame structure 21 constitute a support frame that supports the solid scraping device 10 on the cover plate 103 of the casing.

  The second frame structure 21 has a box-shaped mechanism case 21a, a cylindrical portion 21b that protrudes downward from the lower end of the mechanism case, and a lid 21c that closes an opening at the upper end of the mechanism case 21a. A flange 21 d provided at the lower end of the cylindrical portion 21 b is placed on the flange 20 b of the first frame structure 20. The flange 21d of the second frame structure and the flange 20b of the first frame structure 20 are each provided with a plurality of mounting holes 21d1 and 20b1 that are aligned with each other, and the casing lid is passed through the mounting holes 21d1 and 20b1 that are aligned with each other. The flanges 21 d and 20 b are fastened together with the cover plate 103 of the casing by bolts (not shown) screwed into screw holes provided in the plate 103. In the illustrated example, a plurality of reinforcing ribs 21e are formed across the mechanism case 21a, the cylindrical portion 21b, and the flange 21d of the second frame structure 21.

  A lid 21c that closes the upper end of the mechanism case 21a provided in the second frame structure 21 includes a boss portion 21c1 that projects upward from the upper surface of the lid 21c, and a cylindrical portion 21c2 that projects downward from the lower surface of the lid 21c. The center axis of the boss portion 20c1 and the cylindrical portion 21c2 is aligned with the central axis of the cylindrical portion 21b, and is fixed to the upper end of the mechanism case 21a. In the present embodiment, the cylindrical portion 20 a of the first frame structure 20 and the cylindrical portion 20 b of the second frame structure 21 have a cylindrical inner peripheral surface, and the tip portion is the inner side of the casing 1. Thus, a cylindrical shaft support portion facing the basket 4 is configured.

  On the inner side of the first frame structure 20 and the second frame structure 21, a scraping shaft 11 extending in the vertical direction has its central axis as the central axis of the cylindrical portion 21 b of the second frame structure 21 and It arrange | positions in the state made to correspond with the central axis of the cylindrical part 20a of the 1st frame structure 20, and the boss | hub part 21c1 of the lid | cover 21c, and the central axis of the cylindrical part 20c2. In this embodiment, let the lower end and upper end of the scraping shaft 11 be the front end and the rear end of the scraping shaft, respectively. On the outer periphery of the scraping shaft 11, a male screw portion 22 having a length equal to or longer than the stroke of the scraping shaft (amount of displacement in the axial direction) is provided in a state of being positioned near the rear end of the scraping shaft. It has been. A ceramic cylinder (ceramic pipe) 23 forming a part of the scraping shaft 11 is fitted and fixed to the outer periphery of the portion closer to the tip than the portion where the male screw portion 22 of the scraping shaft 11 is provided. Yes. Further, a guide groove 24 having a length equal to or longer than the stroke of the scraping shaft 11 is formed on the outer periphery of the portion of the scraping shaft 11 where the male screw portion 22 is provided so as to cross a part of the thread of the male screw portion. Is formed.

  In order to reciprocate the scraping shaft 11, the cylindrical scraping shaft drive member 26 that concentrically surrounds the scraping shaft 11 and the scraping shaft drive member 26 penetrates in the radial direction and is slidable in the guide groove 24. A fitted guide portion 25 (see FIG. 3) and a drive member drive mechanism 27 for reciprocatingly driving the scraping shaft drive member 26 are provided. Since the scraping shaft drive member 26 is coupled to the scraping shaft 11 via a guide portion 25 that is slidably fitted in the guide groove 24, displacement of the scraping shaft 11 along the axial direction is allowed. It can rotate with the scraping shaft 11 in the state.

  The drive member drive mechanism 27 reciprocally rotates the scraping shaft drive member 26 so as to reciprocate the scraper shaft 11 around a central axis thereof in a certain angular range in order to rotate the scraping blade 13 in the basket. It is a mechanism to drive. The illustrated drive member drive mechanism 27 includes a pair of grooved levers 28 and 28 that are disposed at an interval in the axial direction of the scraping shaft 11 and integrated with the scraping shaft drive member 26, and penetrates the center portion. A movable piece 29 having a female screw portion and disposed between a pair of grooved levers (lever having a groove along the longitudinal direction) 28, 28, and a pair of grooved levers 28 fixed to the movable piece 29 , 28, a pair of pins 30, 30 fitted in a pair of grooves 28 a, 28 a, a screw rod 31 screwed into a female screw portion formed in the movable piece 29, and a screw rod 31, respectively. And a rotational drive source 32 for rotationally driving the motor.

  As shown in FIG. 3, the rotational drive source 32 includes a motor (electric motor) 33 and a speed reducer 34 that decelerates the rotation of the motor 33, and the output shaft of the speed reducer 34 is connected to the screw rod 31. It is connected. In the example shown in the drawing, the grooved levers 28 and 28 are fork-like ones whose ends of the groove portions 28 a and 28 a are opened. Therefore, when the scraping shaft drive member 26 is driven, the grooved lever 28 is used. In order to prevent the tips of the levers 28, 28 from opening, the U-shaped reinforcing members 36, 36 that connect the tips of the levers 28, 28 to the tips of the pair of arms on both sides of the grooves 28a, 28a. Is attached.

  In the illustrated driving member driving mechanism 27, when the motor 33 is rotated, the screw rod 31 is rotated to displace the movable piece 29. Since the displacement of the movable piece is transmitted to the lever 28 via the pin 30, the lever 28 rotates to rotate the scraping shaft driving member 26. Since the scraping shaft driving member 26 is coupled to the scraping shaft 11 via a guide member 25 fitted in the guide groove 24 of the scraping shaft 11, the scraping shaft driving member 26 is scraped when rotated. The shaft 11 is rotated. The rotation direction of the scraping shaft 11 can be switched by switching the rotation direction of the motor 33 and reversing the moving direction of the movable piece 29. By rotating the motor 33 back and forth, the scraping shaft 11 is fixed. It can be rotated back and forth within an angular range.

  In the present embodiment, the scraping blade 13 is in a retracted position (a position indicated by a chain line in FIG. 3) in which the tip of the scraping blade 13 is located further on the inner diameter side than a position corresponding to the inner periphery of the end plate 402 of the basket. Scraping so as to reciprocally swivel between the tip and the penetration limit position (the position indicated by the solid line in FIG. 3) where the tip is close to the filter attached to the inner periphery of the peripheral wall 401 of the basket. A rotation angle range of the shaft 11 is set.

  In order to displace the scraping shaft 11 in the axial direction, an annular rotating member having a female screw portion 40 on the inner periphery and screwed to the male screw portion 22 on the outer periphery of the scraping shaft 11. 41 and a rotating member driving mechanism 42 that drives the rotating member 41 to reciprocate to displace the scraping shaft 11 in the axial direction.

  The illustrated rotating member 41 is composed of a worm gear having a female screw portion 40 formed on the inner periphery thereof, and the inner screw of the worm gear is screwed to the male screw portion 22 on the outer periphery of the scraping shaft 11. Has been. The rotating member drive mechanism 42 includes a worm 44 meshed with the teeth 43 on the outer periphery of the worm gear constituting the rotating member 41, and a rotation drive source 45 (see FIG. 3) for driving the worm 44 to rotate.

  In the present embodiment, the rotation drive source 45 is a motor (electric motor), and the rotation shaft of the motor is coupled to the worm 44. In the illustrated example, the upper end of the rotating member (worm gear) 41 is arranged on the inner circumference of the inner ring of the ball bearing 50 in which the outer ring is held on the inner circumference of the annular bearing holding portion formed at the lower end of the scraping shaft driving member 26. By fitting, the upper end of the rotating member 41 is supported rotatably with respect to the scraping shaft driving member 26.

  Since the guide member 25 fixed to the scraping shaft driving member 26 is slidably fitted in the guide groove 24 provided on the outer periphery of the scraping shaft 11, the scraping shaft driving member 26 stops rotating. In this state, the scraping shaft 11 cannot rotate, and the scraping shaft 11 is only allowed to be displaced in the axial direction. Therefore, the scraping shaft 11 can be displaced in the axial direction by rotating the rotating member (worm gear) 41 by rotating the worm 44 by the rotation drive source 45. The direction of displacement of the scraping shaft 11 can be switched by switching the rotation direction of the rotation drive source 45 and switching the rotation direction of the rotation member 41. The rotation member 41 is rotated in one direction and the other direction, respectively. Thus, the scraping shaft 11 can be linearly moved upward and downward.

  In the present embodiment, the scraping blade 13 is set at an upper limit position set close to the lower surface of the end plate 402 of the basket 4 as shown in FIG. 5, and the bottom plate 403 of the basket 4 as shown in FIG. A range of movement along the vertical direction of the scraping shaft 11 (the axial direction of the basket) is set so as to be displaced up and down between a lower limit position set at a position close to the upper surface of the basket.

  Below the rotating member 41 is an inner cylindrical body 51 that concentrically surrounds a portion near the tip of the scraping shaft 11 when the scraping shaft 11 is displaced in the axial direction, and shares the central axis with the rotating member 41. The flange 51a provided at the upper end of the inner cylinder 51 is fastened with the bolt 52 to the flange 41a provided at the lower end of the rotation member 41, whereby the rotation member 41 and the inner cylinder 51 are connected. It is connected. The upper end of the inner cylinder 51 is rotatably supported on the inner periphery of the cylindrical portion 21 b of the second frame structure 21 via a ball bearing 53.

  A thick portion 23 a is formed at the upper end of the ceramic cylinder 23 fitted to the scraping shaft 11, and a bearing metal 54 is disposed between the scraping shaft 11 and the upper end portion of the inner cylinder 51. Yes. Since the inner cylinder 51 and the rotating member 41 are connected in a state where their respective axes are shared, when the rotating member 41 is rotated by driving the rotation drive source 45, the inner cylinder 51 and the rotating member 41 are rotated. Rotate together.

  In the present embodiment, the outer cylinder 55 that shares the central axis with the inner cylinder 51 is slidably fitted to the outer periphery of the inner cylinder 51. The outer cylinder 55 is rotatable and thrust through bearing metal 61 and 62 on the inner circumference of the cylindrical portion 21b of the second frame structure 21 and the inner circumference of the shaft support portion 20a of the first frame structure 20, respectively. It is supported freely. A pair of guide grooves 51 a and 51 a extending along the axial direction of the inner cylinder are formed at symmetrical positions on the outer periphery of the inner cylinder 51 at 180 degrees apart from each other, and a pair of pins 65 penetrating the outer cylinder 55. , 65 are slidably fitted in the guide grooves 51a, 51a.

  Therefore, when the inner cylinder 51 rotates together with the rotating member 41, the outer cylinder 55 rotates integrally with the inner cylinder 51 in a state where displacement in the axial direction is allowed. In this embodiment, when the rotary member 41 is rotated by the inner cylinder body 51 and the outer cylinder body 55 in order to displace the scraping shaft 11 in the axial direction, the portion near the tip of the scraping shaft 11 is concentric. A cylindrical member 56 having a telescope structure that rotates integrally with the rotating member 41 in a state surrounded by the rotating member 41 is configured.

  An annular wiper 70 that is in close contact with the outer peripheral surface of the scraping shaft (in this embodiment, the outer peripheral surface of the ceramic pipe 23) in a state of surrounding the scraping shaft 11, is provided at the front end (lower end) of the outer cylindrical body 55. It is attached via a wiper attachment 71.

  In this embodiment, as shown in FIG. 9, an annular main lip 70a formed of an elastic material such as rubber and having a wedge-shaped cross section and a sub lip 70b arranged side by side with the main lip are integrated. An annular wiper 70 is formed by the annular lip seal included in the ring, and this wiper is fixed to the inner periphery of the ring-shaped wiper holder 72.

  As shown in FIG. 8, the wiper attachment 71 is made of an annular member having an inner flange 71a formed on the inner peripheral portion of one end in the axial direction, and the wiper 70 is held on the inner periphery thereof. The wiper holding members 72 are fitted and held in a state where the wipers 70 are arranged back to back. The wire attachment 71 holding the wiper holders 72 and 72 to which the wipers 70 and 70 are fixed is arranged in contact with the lower end of the outer cylinder 55 and is attached to the lower end of the outer cylinder 55 by a plurality of bolts 73. The annular wipers 70 and 70 that are fastened and arranged back to back are brought into close contact with the outer periphery of the ceramic cylinder 23 that forms part of the scraping shaft 11.

  The inner diameter of the inner flange 71a of the wiper attachment 71 is set to a size that allows the scraping shaft 11 covered with the ceramic cylinder 23 to pass through loosely. Further, when the scraping shaft 11 is lowered to the intermediate position, the wiper holding portion 72 is formed such that the thick portion 23a formed at the upper end of the ceramic cylinder 23 is in contact with the inner peripheral portion of the wiper holding member 72 from the axial direction. The inner diameter is set.

  Further, in the present embodiment, when the scraping shaft 11 is displaced upward, the boss portion 12 a that fixes the rear end portion of the swivel arm 12 to the lower end of the scraping shaft 11 comes into contact with the lower end of the wiper attachment 71. A boss portion 12a is provided to obtain. The outer cylinder 55 and the first frame structure are in close contact with the outer periphery of the outer cylinder 55 inside the lower end of the cylindrical portion 20a of the first frame structure 20 (the lower end of the shaft support portion of the support frame). An annular seal member 75 is fixed between the 20 cylindrical portions 20a (between the outer cylindrical body 55 and the shaft support portion of the support frame) to prevent foreign matters such as solid matter from entering. As the seal member 75, it is preferable to use a seal member having a lip that is in close contact with the outer periphery of the outer cylindrical body 72, such as a lip seal.

  A cylindrical shaft cover 80 (see FIG. 1) that accommodates a portion protruding upward from the lid 21c of the scraping shaft 11 is attached to the lid 21c that closes the opening at the upper end of the mechanism case 21a of the second frame structure 21. Is attached.

  When performing the process which isolate | separates undiluted | stock solution into a solid substance and a liquid component using the centrifuge of this embodiment, the state which located the scraping blade 13 in the retracted position (position shown by the chain line in FIG. 3) Then, the stock solution is supplied through the feed pipe 7 into the basket 4 driven at high speed and driven by the basket driving device 6, and the stock solution is separated into solid and liquid components by the centrifugal force generated by the high-speed rotation of the basket. A solid-liquid separation process is performed. The separated solid matter is deposited in layers inside a filter (not shown) attached to the inner periphery of the peripheral wall 401 of the basket 4. Further, the separated liquid component is discharged out of the basket 4 through a solid layer formed inside the filter, the filter, and a perforation hole provided in the peripheral wall portion 401 of the basket.

  A cleaning step of cleaning the solid layer by supplying a cleaning liquid into the basket rotating at a high speed after the solid layer having a predetermined thickness is formed in the basket 4 and discharging of the liquid is completed; And a dehydration process for removing the cleaning liquid from the liquid. After the liquid removal process is completed, in the state where the basket 4 is decelerated, the solid material scraping device 10 scrapes the solid material inside the peripheral wall portion of the basket and drops it onto the bottom plate of the basket. Do. In the solid material scraping process, as shown in FIG. 5, the scraping blade 13 is first positioned at the upper limit position close to the end plate 402 at the upper end of the basket.

  In this state, by rotating the motor 33 and rotating the lever 28, the scraping shaft 11 is rotated and the scraping blade 13 is swung toward the solid layer formed inside the peripheral wall portion of the basket. The scraping blade 13 enters the solid layer. The tip of the scraping blade 13 is opposed to a filter attached to the inner periphery of the peripheral wall portion of the basket through a predetermined gap (a gap set in view of safety so that the scraping blade does not contact the filter). When the scraping blade reaches the intrusion limit position (the position indicated by the solid line in FIG. 3) in which the scraping blade enters the state, the turning of the scraping blade is stopped.

  Next, in a state where the scraping blade 13 is held at the limit position, the rotating member 41 is rotated by rotating the worm 41, the scraping shaft 11 is linearly moved downward, and the scraping blade 13 is displaced downward. . As a result, the solid matter is dropped onto the bottom plate 403 of the basket.

  FIG. 6 shows a state where the scraping blade 13 is lowered to an intermediate position in the vertical direction of the basket. When the scraping shaft 11 is lowered to the position shown in FIG. 6, the thick portion 23 a formed at the upper end of the ceramic pipe 23 fitted on the outer periphery of the scraping shaft 11 is fixed to the lower end of the outer cylinder 55. The wiper holding member 72 is in contact with a portion near the inner periphery. When the scraping shaft 11 is further lowered from this state, the thick portion 23a of the ceramic pipe 23 pushes the outer cylinder 55 downward through the wiper holding member 72, so that the outer cylinder 55 is the first frame structure. 20 from the inside of the cylindrical portion 20a (inside the shaft support portion of the support frame), the lower end of the outer cylinder 55 is displaced further downward than the lower end of the inner cylinder 51, As the scraping shaft 11 is displaced, the length of the cylindrical member 56 increases.

  As shown in FIG. 7, the lowering operation of the scraping shaft 11 is stopped when the scraping blade 13 finally reaches the lower limit position where the scraping blade 13 comes close to the bottom plate 403 of the basket 4. Next, by rotating the scraping shaft 11 and turning the scraping blade 13 toward the inner diameter side of the basket, the guide plate 16 is turned toward the solid discharge port 405 side, and the solid matter remaining on the bottom plate of the basket is removed. Move toward the solid discharge port 405.

  As shown in FIG. 7, when the scraping shaft 11 is moved upward from the state where the scraping blade 13 has reached the lower limit position, the boss portion 12 a of the swivel arm 12 fixed to the lower end of the scraping shaft 11 becomes the outer cylinder. It approaches the lower end of the body 55. After the boss portion 12a of the swivel arm 12 attached to the lower end of the scraping shaft 11 comes into contact with the wiper attachment 71 at the lower end of the outer cylindrical body 55, the boss portion 12a is moved along with the upward displacement of the scraping shaft 11. Pushes the outer cylinder 55 upward, so that the outer cylinder 55 enters the inside of the cylindrical portion 20a of the first frame structure 20 and the length of the cylindrical member 56 is shortened.

  When scraping off the solid matter in the basket, the solid matter scraped off and scattered adheres to the outer periphery of the scraping shaft 11. When solid matter attached to the outer periphery of the scraping shaft 11 enters the inside of the inner cylinder 51, the displacement of the scraping shaft is hindered, or the bearing metal supporting the scraping shaft is damaged. Further, when the cylindrical member 56 is configured by the inner cylinder body 51 and the outer cylinder body 55 as in the present embodiment, when the outer cylinder body 55 is displaced downward from the shaft support portion of the support frame, Solid matter adheres to the outer surface of the outer cylinder 55.

  In the present embodiment, when the scraping shaft 11 is displaced in the axial direction, a relative displacement is generated between the annular wiper 70 and the scraping shaft 11 and includes a displacement in the axial direction and a rotational displacement about the axis. Therefore, the annular wiper 70 moves to the scraping shaft while combining the operation of pushing the solid matter adhering to the scraping shaft 11 in the axial direction of the scraping shaft and the operation of cutting the solid matter while the annular wiper 70 rotates. The attached solid matter is removed. Therefore, compared with the case where only the relative displacement in the axial direction is generated between the wiper 70 and the scraping shaft, the solid matter can be more reliably removed from the scraping shaft 11, and the scraping shaft 11. Even if it is not covered with a bellows, it is possible to reliably prevent solids from entering the support portion of the scraping shaft.

  Further, in the present embodiment, when the scraping shaft 11 is moved in the axial direction, the outer cylindrical body 55 also rotates together with the inner cylindrical body 51. Therefore, when the outer cylindrical body 55 is displaced in the axial direction (the cylindrical member expands and contracts). On the other hand, a relative displacement composed of an axial displacement and a rotational displacement occurs between the outer cylindrical body 55 and the annular wiper 75. Accordingly, the solid matter adhering to the outer surface of the outer cylindrical body 55 can also be reliably removed by the annular wiper 75.

  Further, as in the present embodiment, a mechanism for driving the scraping shaft 11 in the axial direction includes a male screw portion 22 formed on the outer periphery of the scraping shaft 11 and a female screw portion screwed into the male screw portion. An annular rotary member 41 provided on the inner periphery and a rotary member drive mechanism 42 that drives the rotary member 41 to reciprocate in order to reciprocate the scraping shaft in the axial direction. The scraping shaft 11 is displaced in the axial direction. A cylindrical member 56 that rotates integrally with the rotary member in a state of concentrically surrounding the portion near the tip of the scraping shaft when the scraping shaft is disposed, and closely contacts the outer periphery of the scraping shaft inside the tip of the cylindrical member. If the annular wiper 70 is fixed, the scraper shaft performs a linear motion along the axial direction in order to scrape solid matter in the basket. Wiper 7 necessary for removing solid matter adhering to the spindle Therefore, the mechanism for driving the scraping shaft 11 and the wiper 70 can be prevented from becoming complicated, and scraping can be performed without increasing the size of the apparatus and increasing the cost. A centrifuge that can omit the bellows covering the shaft can be obtained.

  As in the above embodiment, the cylindrical member 56 that rotates integrally with the rotating member (worm wheel) 41 that constitutes the mechanism that drives the scraping shaft 11 in the axial direction includes the inner cylindrical body 51 and the outer cylindrical body 55. If the cylindrical member 56 is expanded and contracted in the process of linearly displacing the scraping shaft as a telescopic structure, it can be applied to a centrifuge with a long stroke of the scraping shaft 11.

  In the above description, in order to move the outer cylinder 55 downward, the thick portion 23a is formed at the upper end of the ceramic cylinder 23 covering the scraping shaft 11, and the scraping shaft 11 moves downward from the intermediate position. In this case, the outer cylinder 55 is moved downward by pushing the wiper holding member 72 with the thick portion 23a. However, the means for moving the outer cylinder 55 downward is not limited to the above example. For example, instead of forming a thick portion in the ceramic cylinder 23, a member that pushes the outer cylinder 55 downward may be fixed to the outer periphery of the ceramic cylinder 23.

  Further, when the scraping shaft 11 is displaced downward, first, the outer cylindrical body 55 is displaced downward along with the wiper 70 and the scraping shaft 11, and the outer cylindrical body 55 is displaced to the lower limit position. After stopping, only the scraping shaft 11 may be displaced downward. In this case, when the scraping shaft 11 is raised, the outer cylinder 55 is first lifted along with it, the outer cylinder 55 is displaced to the upper limit position, and then only the scraping shaft 11 is displaced upward.

  In the above description, a lip seal is used as the wiper 70. However, the wiper 70 is made of a material having acid resistance, wear resistance and durability, and can be in close contact with the outer periphery of the scraping shaft. I just need it. In order to effectively remove the solid matter adhering to the outer periphery of the scraping shaft with an annular wiper, an annular wiper having at least one annular lip having a wedge-shaped cross section is used. The tip of the shape is preferably in contact with the scraping shaft. In the above description, the annular wiper 70 is made of an elastic material. However, the annular wiper 70 formed of a hard material can also be used. As the annular wiper 70, a material having an optimal material and structure may be used according to the properties of the solid material formed in the basket. The same applies to the annular “wiper 75” provided inside the lower end of the cylindrical portion 20a of the first frame structure 20 in order to remove the solid matter adhering to the outer surface of the outer cylindrical body 55.

  In the above embodiment, the cylindrical member 56 is configured by the inner cylindrical body 51 and the outer cylindrical body 55 so that the cylindrical member 56 can be expanded and contracted. However, when the stroke of the scraping shaft 11 is not particularly long (basket 4 is not particularly long), as shown in FIG. 10, a single member that rotates integrally with a rotating member (worm wheel) 41 that constitutes a mechanism for moving the scraping shaft 11 in the axial direction. A cylindrical member 56 ′ made of a single cylindrical body is provided inside the cylindrical portion 20 a of the first frame structure 20, and an annular wiper 70 that is in close contact with the outer periphery of the scraping shaft 11 is wiped at the tip of the cylindrical member 56 ′. What is necessary is just to make it attach via the fixture 71. FIG. In this case, since the cylindrical member 56 ′ rotates but does not displace in the axial direction, the wiper 75 ′ fixed inside the lower end of the cylindrical portion 20 a of the first frame structure 20 is connected to the rotating cylindrical member 51. What is necessary is just to be able to seal between the fixed cylindrical part 20a.

  In the example shown in FIG. 10, the inner cylinder 51 is illustrated as being provided integrally with the rotating member 42, but the inner cylinder 51 is connected to the rotating member 42 in the same manner as in the example illustrated in FIG. 4. You may make it comprise by another member and may connect both.

  In the above embodiment, the outer periphery of the portion near the tip of the scraping shaft 11 (the outer periphery of the portion inserted into the basket) is covered with the ceramic cylinder 23. However, the scraping shaft 11 is made of a material having acid resistance. In the case of construction, the ceramic cylinder can be omitted. When the scraping shaft is formed of a material that does not have acid resistance, the outer periphery of the scraping shaft can be covered with a material having acid resistance other than ceramic.

  Further, when the cylindrical member is constituted by the inner cylinder and the outer cylinder, the portion where the solid matter of the inner cylinder and the outer cylinder may adhere is formed of an acid-resistant material or ceramic. It is preferable to cover with a material having acid resistance such as.

1 casing
101 Casing body
103 Cover plate of casing
4 baskets
401 peripheral wall
402 end plate
403 Bottom plate
10 Solid material scraping device
11 Scraping shaft
12 Swivel arm
13 Scraping blade
20 First frame structure
20a Cylindrical part
21 Second frame structure
21a Mechanism case
21b Cylindrical part
22 Male thread on the scraping shaft
23 Ceramic cylinder
24 Guide groove provided on scraping shaft
26 Scraping shaft drive member
27 Drive member drive mechanism
28 lever
29 Movable piece
30 pins
31 Screw rod
41 Rotating member (worm gear)
42 Rotating member drive mechanism
44 Warm
51 inner cylinder
55 Outer cylinder
56 Cylindrical member
56 'cylindrical member
70 wipers
71 Wiper fitting
72 Wiper holding member
75 Wiper

Claims (6)

A basket disposed in a casing and rotatably supported, a state in which the axis is directed in a direction parallel to the axis of the basket, and is rotatable around a central axis, and is displaceable in the direction of the axis of the basket A scraping shaft supported by the casing and having a portion near the tip inserted into the basket through the opening of the basket, a swivel arm having a rear end fixed to the tip of the scraping shaft, and the swivel A scraping blade attached to the tip of an arm, an axial driving device for reciprocatingly driving the scraping shaft in the axial direction to linearly move the scraping blade in the axial direction of the basket, and the scraping blade in the basket A rotary drive device for reciprocatingly rotating the scraping shaft within a certain angular range to swivel the inside of the basket. In the centrifuge scraping by and dynamic,
The rotary drive device includes a guide groove formed on an outer periphery of the scraping shaft so as to extend in an axial direction of the scraping shaft, and a guide portion slidably fitted in the guide groove. A scraping shaft drive member that is coupled to the scraping shaft so as to be able to rotate with the scraping shaft while allowing displacement along the axial direction of the scraping shaft, and the scraping shaft with its central axis A drive member drive mechanism for reciprocatingly driving the scraping shaft drive member so as to reciprocate around the fixed angle range around the center;
The axial direction driving device includes a male screw portion formed on an outer periphery of the scraping shaft, an annular rotating member having an inner screw portion threadedly engaged with the male screw portion, and the scraping shaft. A rotating member driving mechanism that reciprocally drives the rotating member to reciprocate in the axial direction;
A cylindrical member that rotates integrally with the rotating member in a state of concentrically surrounding a portion near the tip of the scraping shaft when the scraping shaft is displaced in the axial direction;
An annular wiper that is in close contact with the outer periphery of the scraping shaft in a state of surrounding the scraping shaft is fixed to the tip of the cylindrical member,
When the scraping shaft is displaced in the axial direction, a relative displacement consisting of a displacement in the axial direction and a rotational displacement about the axis is generated between the annular wiper and the scraping shaft. Configured to perform a cleaning operation to remove solid matter adhered to the
Centrifuge characterized by.   The centrifuge according to claim 1, wherein the wiper is formed of a seal member having at least one annular lip having a wedge-shaped cross section in close contact with the outer peripheral surface of the scraping shaft.   A ceramic cylinder is fitted and fixed to the outer periphery of a portion of the scraping shaft that is inserted into the basket, the ceramic cylinder forms a part of the scraping shaft, and the scraping shaft is in the axial direction. The centrifugal separation according to claim 1 or 2, wherein the length of the ceramic cylinder is set so that the wiper is in close contact with the outer periphery of the ceramic cylinder in the entire process of the displacement process. Machine. A support frame having a cylindrical shaft support portion having a cylindrical inner peripheral surface and having a tip portion facing the inside of the basket inside the casing is fixed to the casing,
The scraping shaft is disposed concentrically with the shaft support portion inside the shaft support portion of the support frame, is rotatable about a central axis, and is displaceable in the axial direction of the basket. Supported by the support frame;
The cylindrical member is disposed inside the shaft support portion of the support frame and connected to the rotary member so as to rotate together with the rotary member, and the inner cylindrical body and the support frame A cylindrical outer cylinder coupled to the inner cylinder so as to rotate together with the inner cylinder in a state in which an axial displacement is allowed while being disposed between the inner circumferential surface of the shaft support portion; ,
The annular wiper is fixed to the tip of the outer cylinder,
Another annular wiper that is in close contact with the outer periphery of the outer cylinder is fixed to the inside of the tip of the shaft support portion of the support frame,
In the process in which the scraping shaft enters the basket, the outer cylinder can be displaced to a position where the tip of the outer cylinder reaches a deeper portion of the basket than the tip of the inner cylinder. The centrifuge according to claim 1, 2 or 3, wherein the centrifuge is configured as described above. The rotating member of the axial drive mechanism is composed of a worm gear having an internal thread formed on the inner periphery thereof, and the internal thread of the inner periphery of the worm gear is screwed into the external thread of the scraping shaft. ,
The centrifuge according to any one of claims 1 to 4, wherein the rotating member driving mechanism includes a worm meshed with the worm gear, and a rotation driving source that rotationally drives the worm. .   A driving member driving mechanism for reciprocatingly driving the scraping shaft driving member; a pair of grooved levers arranged at an interval in the axial direction of the scraping shaft and integrated with the scraping shaft driving member; A movable piece having an internal thread portion disposed between the pair of grooved levers and a pair of grooves fixed to the movable piece and formed in the pair of grooved levers, respectively. 6. The centrifuge according to claim 1, further comprising: a pair of pins that are formed, a screw rod that is screwed into an internal thread portion of the movable piece, and a rotational drive source that rotationally drives the screw rod. Separator.

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