JP2010150026A - Bearing structure suitable for spiral conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To completely prevent the intrusion of a solid in a solid-liquid mixed phase into a gap between a rotating shaft and a bearing effectively or substantially even in low speed rotation. <P>SOLUTION: In the bearing structure arranged below the liquid surface of the solid-liquid mixed phase, the rotating shaft 10 and the bearing part 30 have large diameter parts 11 and 31 and small diameter parts 13 and 33, and therefore, a bent gap is formed between them, and a telescopic ring is arranged in a gap G between steps of the rotating shaft and the bearing, preventing the intrusion of the solid. A recessed groove is annularly provided in opposing sections facing the steps of the rotating shaft and the bearing, and central axis direction both ends of the telescopic ring are fitted in the recessed groove. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention generally relates to a bearing structure suitable for being placed below a liquid surface of a storage tank or the like containing a solid-liquid mixed phase, and more particularly to a bearing structure suitable for a spiral conveyor.

As a bearing structure suitable for a spiral conveyor, there is one described in Patent Document 1 proposed by the applicant. This bearing structure can be suitably applied to a spiral conveyor that transports a solid-liquid mixed phase in which a large number of dusts such as chips are mixed in oil in a predetermined direction. Since both the bearing portion fixed to the end portion and the rotating shaft rotatably accommodated inside the bearing portion via a bearing are formed as having a large diameter portion and a reduced diameter portion, the bearing The space between the rotating shaft and the rotating shaft is not linear but bent. Further, a laminated ring is provided in the bent gap. By adopting such a structure, liquid such as oil in the solid-liquid mixed phase is prevented from leaking through the gap, and solid dust in the mixed phase also enters the gap. Therefore, the dust-proofing effect can be enhanced and continuous use for a long time can be realized.
Japanese Patent Publication No. 6-99014

  The bearing structure described in Patent Document 1 exerted the above-mentioned effects, but very rarely the solid dust in the solid-liquid mixed layer entered the gap, causing clogging and interrupting the operation. In some cases, it was forced to have a dustproof effect.

  Therefore, an object of the present invention is to allow the solid matter in the solid-liquid mixed phase to enter the gap between the rotating shaft and the bearing even in the low-speed rotation in the bearing structure arranged below the liquid surface of the solid-liquid mixed phase. It is an object of the present invention to provide a novel structure for making it possible to prevent the above effectively or substantially completely.

  In order to solve the above problems, a bearing structure suitable for the spiral conveyor of the present invention according to claim 1 includes a bearing portion fixed to a container wall at a base end portion of a container containing a solid-liquid mixed phase, and the bearing portion. A rotary shaft that is rotatably accommodated through a bearing and extends through the vessel wall below the liquid level of the solid-liquid mixed phase contained in the vessel, and the bearing portion has a large diameter portion. And the rotation shaft has a large diameter portion surrounded and accommodated in the large diameter portion of the bearing portion and a small diameter portion surrounded and accommodated in the small diameter portion of the bearing portion. In addition, a continuous void is formed between the large-diameter portion and the small-diameter portion and between the step portions defining the boundary between the large-diameter portion and the small-diameter portion, and these steps are formed. At least one gap formed between the parts Sealing means and being provided so as to cross the gap between the adjacent stepped portions.

  According to a second aspect of the present invention, in the bearing structure according to the first aspect of the present invention, as the sealing means, a stretchable ring formed by winding a single thin flat plate material in a spiral shape and winding it a plurality of times is used. It is used.

  According to a third aspect of the present invention, in the bearing structure according to the second aspect of the present invention, a concave groove is provided around each of the bearing portions and the steps facing the stepped portion of the rotating shaft, and the expansion and contraction is provided in the concave groove. Both ends of the universal ring in the central axis direction are fitted, and the telescopic ring prevents the solid matter in the solid-liquid mixed layer from entering the gap formed between the stepped portions. Features.

  According to a fourth aspect of the present invention, in the bearing structure according to the second or third aspect, a plurality of the expansion rings having different diameters are provided in a multiple manner.

  According to this invention, the bearing portion has a large diameter portion and a small diameter portion, and the rotary shaft is enclosed and accommodated in the large diameter portion and the small diameter portion of the bearing portion that are enclosed and accommodated in the large diameter portion of the bearing portion. And at least one sealing means is provided in the gap formed between the step portions that define the boundary between the large diameter portion and the small diameter portion. It is possible to effectively prevent the solid matter in the solid-liquid mixed phase from entering the gap between the bearing and the bearing.

  As this sealing means, a stretchable ring formed by laminating a single thin plate-like material in a spiral shape and winding it a plurality of times is preferably used. More preferably, a bearing portion and a step portion of a rotating shaft are used. A concave groove is provided in each of the facing portions facing the upper and lower ends, and both end portions in the central axis direction of the telescopic ring are fitted into the concave groove. Moreover, according to one Embodiment of this invention, the said some expansion-contraction ring from which a diameter differs is provided in multiple. By adopting these additional configurations, the solid matter in the solid-liquid mixed layer can be more effectively or substantially completely prevented from entering the gaps between the step portions.

  FIG. 1 is a partial cross-sectional view of an embodiment in which the bearing structure of the present invention is applied to a rotary drive shaft at the base end of a spiral conveyor tray. A tray 1 having a U-shaped cross-sectional shape has a bottom wall 1 and an end wall 2 and is attached to various machine tools such as a lathe and accommodates a cutting fluid containing a large amount of chips. A bearing portion 30 having a bearing structure is attached to the end wall 2 by a fixing means such as a bolt B. The rotating shaft 10 is rotatably accommodated in the bearing portion 30. The rotating shaft 10 has two portions having different shaft diameters, that is, a large diameter portion 11 and a small diameter portion 13. The small-diameter portion 13 is formed on the front end side that passes through the end wall 2 of the tray 1, and the sprocket wheel SW is fixed to the tip by a spring pin SP. A spiral S having a rectangular cross section is fixed to the outer periphery of the large-diameter portion 11 constituting the main part of the rotating shaft 10 by screws SC. An annular groove 12 is recessed in the outer peripheral surface of the portion of the large diameter portion 11 close to the step portion with the small diameter portion 13.

  The bearing portion 30 has a large diameter portion 31 and a small diameter portion 33 corresponding to the large diameter portion 11 and the small diameter portion 13 of the rotating shaft 10, and the large diameter portion 31 of the bearing portion 30 has a large diameter of the rotating shaft 10. The diameter portion 11 is accommodated, and the small diameter portion 13 of the rotating shaft 10 is accommodated in the small diameter portion 33 of the bearing portion 30. An annular groove 32 is recessed in the inner peripheral surface of the portion close to the step portion with the large diameter portion of the small diameter portion of the bearing portion 30.

  Laminated rings 51 and 52 are fitted in the annular grooves 12 and 32, respectively. In the illustrated embodiment, the inner diameter side of the laminated ring 51 is fitted into the annular groove 12 formed on the outer periphery of the large diameter portion 11 of the rotary shaft 10, and the outer diameter side is the cylindrical inner portion of the large diameter portion 31 of the bearing portion 30. The outer diameter side of another laminated ring 52 is fitted into an annular groove 32 formed in the inner periphery of the small diameter portion 33 of the bearing portion 30 so as to be in pressure contact with the peripheral surface, and the inner diameter side thereof is the small diameter portion 13 of the rotary shaft 10. Is in pressure contact with the cylindrical outer peripheral surface.

  The fitting form of the laminated rings 51 and 52 is not limited to this. For example, in the case of the laminated ring 51, contrary to the embodiment of FIG. 1, an annular groove is formed on the inner periphery of the large-diameter portion 31 of the bearing portion 30. The outer diameter side of the laminated ring 51 may be fitted into this annular groove, and the inner diameter side may be pressed against the cylindrical outer peripheral surface of the large-diameter portion 11 of the rotating shaft 10, or FIG. In the same manner as described above, the annular groove 12 is formed on the outer periphery of the large-diameter portion 11 of the rotary shaft 10 and the annular groove is also formed at the opposite position on the inner periphery of the large-diameter portion 31 of the bearing portion 30 and laminated on these annular grooves The outer diameter side and inner diameter side of the ring 51 may be fitted. Further, regarding the laminated ring 52, contrary to the embodiment of FIG. 1, an annular groove is formed on the outer periphery of the small diameter portion 13 of the rotating shaft 10, and the inner diameter side of the laminated ring 52 is fitted into the annular groove. The outer diameter side may be pressed against the cylindrical inner peripheral surface of the small diameter portion 33 of the bearing portion 30, or the annular groove 12 is formed on the inner periphery of the small diameter portion 13 of the bearing portion 10 as in FIG. At the same time, annular grooves may be formed at opposite positions on the outer periphery of the small-diameter portion 13 of the rotary shaft 10, and the outer diameter side and inner diameter side of the laminated ring 52 may be fitted into these annular grooves.

  A slight gap G extending in a direction perpendicular to the axial direction is provided between the step portions that define the boundary between the rotary shaft 10 and the large diameter portions 11 and 31 and the small diameter portions 13 and 33 of the bearing portion 30. , Avoiding those surfaces coming into contact with each other. In this gap G, an expandable ring 20 is provided as a sealing means. The expandable ring 20 is formed by laminating a single long and thin flat plate material into a spiral shape and winding it a plurality of times. Products manufactured and sold under can be used (see http://www.to-hatsu.co.jp/products/other_screwcover.html). An example is shown in FIG.

  With reference to FIG. 2 together with FIG. 1, an annular groove 17 is recessed in the step 16 that forms the boundary between the large diameter portion 11 and the small diameter portion 13 of the rotary shaft 10, and the large diameter portion 31 of the bearing portion 30 An annular groove 38 is recessed at a position facing the annular groove 17 in the step portion 37 that forms a boundary with the small diameter portion 33. Then, the expandable ring 20 is assembled so that both ends are fitted into the annular grooves 17 and 38. In this embodiment, the end portion on the large diameter side of the expandable ring 20 is fitted into the annular groove 38 and the end portion on the small diameter side is fitted into the annular groove 17. 17 and 18 may be fitted. Further, the positions of the annular grooves 17 and 18 are not necessarily strictly opposed to each other, and are formed in such dimensions that the fitting state can be stably secured at a position where the end of the expandable ring 20 can be fitted. It should be done.

  The telescopic ring 20 arranged in this manner is fitted into the annular grooves 17 and 18 in a compressed state at both ends, and a single flat plate material wound in a spiral shape is overlapped as shown in FIG. Therefore, it is possible to reliably prevent a solid material such as cutting powder from entering the gap G between the step portions 16 and 37.

  In the illustrated embodiment, two oil seals 53, 54 are provided between the rotary shaft 10 and the bearing portion 30 behind the laminated rings 51, 52, and two bearings (deep groove balls) are provided between them. Bearings) 55 and 56 are provided. Further, a metal ring or sleeve 57 is provided between the oil seal 54 and the rotary shaft 10, and the sleeve 57 and the rotary shaft 10 are inserted into a groove 13 provided in the rotary shaft 10 in an O shape. A ring 58 is provided.

  The procedure for assembling the rotating shaft 10 and the bearing portion 30 in the bearing structure according to the illustrated embodiment is as follows. First, the laminated ring 51 is assembled in the groove 12 of the rotating shaft 10, and the O-ring 58 is assembled in the groove 13. At this time, the laminated ring 51 is of a circumscribed type that is pressed against the inner peripheral surface of the large-diameter portion 31 of the bearing portion 30, and is therefore received with a little play in the groove 12. Protrudes outward from the outer peripheral surface of the large-diameter portion 11 of the rotary shaft 10. On the other hand, the laminated ring 52 is fitted in the groove 32 of the bearing portion 30, and the oil seal 53, the bearings 55 and 56, the oil seal 54, and the sleeve 57 are sequentially assembled. Here, since the laminated ring 52 is an inscribed type that is pressed against the outer peripheral surface of the small-diameter portion 13 of the rotary shaft 10, the laminated ring 52 is received with little play in the groove 32, and the inner diameter of the laminated ring 52 is a bearing. Projecting inward from the inner peripheral surface of the small diameter portion 33 of the portion 30.

  The telescopic ring 20 is inserted from the tip of the small-diameter portion 13 of the rotating shaft 10, and one end is inserted into the annular groove 17 formed in the stepped portion 16, so that the rotating shaft 10 is placed on the right side of the bearing portion 30. When inserted from (in FIG. 1), an oblique chamfered portion 15 on the left shoulder portion of the small-diameter portion 13 of the rotary shaft 10 comes into contact with the inner diameter surface of the laminated ring 52 while expanding the laminated ring 52. Go. Similarly, the oblique chamfered portion 34 at the right shoulder portion of the large diameter portion of the bearing portion 30 contacts the outer diameter surface of the laminated ring 51 to reduce the diameter of the laminated ring 51, while the rotary shaft 10 is inside the bearing portion 30. To invade. The other end (left end) of the telescopic ring 20 is fitted into an annular groove 38 formed in the step portion 37 of the bearing portion 30. After that, by attaching the sprocket wheel SW, the assembly of the rotating shaft 10 and the bearing portion 30 is completed.

  The opening 35 in the end wall 2 of the tray 1 and the outer peripheral surface of the large-diameter portion 31 of the bearing portion 30 are fitted via a packing 35 to extend from the large-diameter portion 31 of the bearing portion 30 in the radial direction. The flange portion 35 and the end wall 2 are in pressure contact with each other via a ring-shaped packing 36 and are fastened and fixed by a fixing means such as a bolt B. Thereafter, the spiral S is fixed to the right end portion of the rotary shaft 10 by appropriate fixing means.

  It was confirmed that the spiral conveyor provided with the bearing structure according to the above-described embodiment can withstand a long continuous operation under normal operating conditions and is sufficiently practical. The rotary shaft 10 and the bearing portion 30 both have a large-diameter portion 11, 31 and a small-diameter portion 13, 33, thereby providing a path (gap) that is bent with respect to intrusion of solid matter, In addition to the arrangement of the laminated rings 51 and 52, the arrangement of the expandable ring 20 in the gap G between the stepped portions 16 and 37 effectively prevents the intrusion of solid matter and provides a favorable dustproof effect for a long time. It is thought that it is sustained throughout.

  Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention. For example, in the above-described embodiment, one stretchable ring 20 is provided in the gap G between the step portions 16 and 37, but the second stretchable ring has a minimum diameter larger than the maximum diameter together with the first stretchable ring. These can be arranged concentrically and multiply using telescopic rings. Of course, it is also possible to use a larger number of stretchable rings having the same diametrical dimensional relationship and concentrically multiplex them. By doing so, it is expected to exhibit an even better dustproof effect.

It is a fragmentary sectional view of the Example which applied the bearing structure by this invention to the rotational drive shaft in the base end part of the tray of a spiral conveyor. It is an enlarged view which shows the arrangement | positioning state of the expandable ring in the Example of FIG. It is a figure which shows an example of a telescopic ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tray 2 End wall 10 Rotating shaft 11 Large diameter part 12 Annular groove 13 Small diameter part 16 Step part 17 Annular groove 20 Retractable ring 30 Bearing part 31 Large diameter part 32 Annular groove 33 Small diameter part 37 Step part 38 Annular grooves 51, 52 Laminated ring 53, 54 Oil seal 55, 56 Bearing

Claims (4)

A bearing portion fixed to the container wall at the base end of the container containing the solid-liquid mixed phase, and a solid-liquid mixed phase accommodated in the vessel by being rotatably accommodated inside the bearing portion via a bearing. A rotating shaft extending through the container wall under the liquid surface, the bearing portion having a large diameter portion and a small diameter portion, and the rotating shaft is surrounded by the large diameter portion of the bearing portion A large-diameter portion to be accommodated and a small-diameter portion that is enclosed and accommodated in the small-diameter portion of the bearing portion, and the boundary between the large-diameter portion and the small-diameter portions and between the large-diameter portion and the small-diameter portion. Between the step portions forming a gap, a continuous gap is formed in a bent shape, and at least one sealing means is provided in the space formed between the step portions. The spa is characterized by being provided to cross Bearing structure suitable for Rarukonbea. The bearing structure according to claim 1, wherein an elastic ring formed by winding a single thin flat plate material in a spiral shape and winding it a plurality of times is used as the sealing means. A concave groove is provided in each of the bearing portions and the rotary shaft facing the stepped portion, and both ends of the telescopic ring in the central axis direction are fitted in the concave groove, and the telescopic ring 3. The bearing structure according to claim 2, wherein solids in the solid-liquid mixed layer are prevented from entering a gap formed between the step portions. The bearing structure according to claim 2 or 3, wherein a plurality of the expansion and contraction rings having different diameters are provided.

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